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Date: Wed, 1 Dec 2010 10:57:29 +1300
From: Charles Manning <cdhmanning@...il.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Charles Manning <cdhmanning@...il.com>
Subject: [PATCH 3/8] Add yaffs2 file system: guts code
Signed-off-by: Charles Manning <cdhmanning@...il.com>
---
fs/yaffs2/yaffs_guts.c | 5236 ++++++++++++++++++++++++++++++++++++++++++++++
fs/yaffs2/yaffs_guts.h | 915 ++++++++
fs/yaffs2/yaffs_yaffs1.c | 437 ++++
fs/yaffs2/yaffs_yaffs1.h | 22 +
fs/yaffs2/yaffs_yaffs2.c | 1620 ++++++++++++++
fs/yaffs2/yaffs_yaffs2.h | 39 +
6 files changed, 8269 insertions(+), 0 deletions(-)
create mode 100644 fs/yaffs2/yaffs_guts.c
create mode 100644 fs/yaffs2/yaffs_guts.h
create mode 100644 fs/yaffs2/yaffs_yaffs1.c
create mode 100644 fs/yaffs2/yaffs_yaffs1.h
create mode 100644 fs/yaffs2/yaffs_yaffs2.c
create mode 100644 fs/yaffs2/yaffs_yaffs2.h
diff --git a/fs/yaffs2/yaffs_guts.c b/fs/yaffs2/yaffs_guts.c
new file mode 100644
index 0000000..c56e060
--- /dev/null
+++ b/fs/yaffs2/yaffs_guts.c
@@ -0,0 +1,5236 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@...ph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_guts.h"
+#include "yaffs_tagsvalidity.h"
+#include "yaffs_getblockinfo.h"
+
+#include "yaffs_tagscompat.h"
+
+#include "yaffs_nand.h"
+
+#include "yaffs_yaffs1.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_verify.h"
+
+#include "yaffs_nand.h"
+#include "yaffs_packedtags2.h"
+
+#include "yaffs_nameval.h"
+#include "yaffs_allocator.h"
+
+#include "yaffs_attribs.h"
+
+/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
+#define YAFFS_GC_GOOD_ENOUGH 2
+#define YAFFS_GC_PASSIVE_THRESHOLD 4
+
+#include "yaffs_ecc.h"
+
+/* Robustification (if it ever comes about...) */
+static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block);
+static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
+ int erased_ok);
+static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
+ const u8 * data,
+ const struct yaffs_ext_tags *tags);
+static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
+ const struct yaffs_ext_tags *tags);
+
+/* Other local prototypes */
+static void yaffs_update_parent(struct yaffs_obj *obj);
+static int yaffs_unlink_obj(struct yaffs_obj *obj);
+static int yaffs_obj_cache_dirty(struct yaffs_obj *obj);
+
+static int yaffs_write_new_chunk(struct yaffs_dev *dev,
+ const u8 * buffer,
+ struct yaffs_ext_tags *tags, int use_reserver);
+
+static struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
+ enum yaffs_obj_type type);
+
+static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
+ struct yaffs_xattr_mod *xmod);
+
+static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj);
+static int yaffs_generic_obj_del(struct yaffs_obj *in);
+
+static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk);
+
+static int yaffs_unlink_worker(struct yaffs_obj *obj);
+
+static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
+ int chunk_obj);
+
+static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
+ struct yaffs_block_info **block_ptr);
+
+static void yaffs_check_obj_details_loaded(struct yaffs_obj *in);
+
+static void yaffs_invalidate_whole_cache(struct yaffs_obj *in);
+static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object,
+ int chunk_id);
+
+static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+ struct yaffs_ext_tags *tags);
+
+static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
+ int nand_chunk,
+ const u8 * data,
+ struct yaffs_ext_tags *tags);
+
+static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name,
+ const YCHAR * oh_name, int buff_size);
+static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name,
+ const YCHAR * name);
+
+/* Function to calculate chunk and offset */
+
+static void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
+ int *chunk_out, u32 * offset_out)
+{
+ int chunk;
+ u32 offset;
+
+ chunk = (u32) (addr >> dev->chunk_shift);
+
+ if (dev->chunk_div == 1) {
+ /* easy power of 2 case */
+ offset = (u32) (addr & dev->chunk_mask);
+ } else {
+ /* Non power-of-2 case */
+
+ loff_t chunk_base;
+
+ chunk /= dev->chunk_div;
+
+ chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
+ offset = (u32) (addr - chunk_base);
+ }
+
+ *chunk_out = chunk;
+ *offset_out = offset;
+}
+
+/* Function to return the number of shifts for a power of 2 greater than or
+ * equal to the given number
+ * Note we don't try to cater for all possible numbers and this does not have to
+ * be hellishly efficient.
+ */
+
+static u32 calc_shifts_ceiling(u32 x)
+{
+ int extra_bits;
+ int shifts;
+
+ shifts = extra_bits = 0;
+
+ while (x > 1) {
+ if (x & 1)
+ extra_bits++;
+ x >>= 1;
+ shifts++;
+ }
+
+ if (extra_bits)
+ shifts++;
+
+ return shifts;
+}
+
+/* Function to return the number of shifts to get a 1 in bit 0
+ */
+
+static u32 calc_shifts(u32 x)
+{
+ u32 shifts;
+
+ shifts = 0;
+
+ if (!x)
+ return 0;
+
+ while (!(x & 1)) {
+ x >>= 1;
+ shifts++;
+ }
+
+ return shifts;
+}
+
+/*
+ * Temporary buffer manipulations.
+ */
+
+static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
+{
+ int i;
+ u8 *buf = (u8 *) 1;
+
+ memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
+
+ for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
+ dev->temp_buffer[i].line = 0; /* not in use */
+ dev->temp_buffer[i].buffer = buf =
+ YMALLOC_DMA(dev->param.total_bytes_per_chunk);
+ }
+
+ return buf ? YAFFS_OK : YAFFS_FAIL;
+}
+
+u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev, int line_no)
+{
+ int i, j;
+
+ dev->temp_in_use++;
+ if (dev->temp_in_use > dev->max_temp)
+ dev->max_temp = dev->temp_in_use;
+
+ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+ if (dev->temp_buffer[i].line == 0) {
+ dev->temp_buffer[i].line = line_no;
+ if ((i + 1) > dev->max_temp) {
+ dev->max_temp = i + 1;
+ for (j = 0; j <= i; j++)
+ dev->temp_buffer[j].max_line =
+ dev->temp_buffer[j].line;
+ }
+
+ return dev->temp_buffer[i].buffer;
+ }
+ }
+
+ T(YAFFS_TRACE_BUFFERS,
+ (TSTR("Out of temp buffers at line %d, other held by lines:"),
+ line_no));
+ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ T(YAFFS_TRACE_BUFFERS,
+ (TSTR(" %d "), dev->temp_buffer[i].line));
+
+ T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
+
+ /*
+ * If we got here then we have to allocate an unmanaged one
+ * This is not good.
+ */
+
+ dev->unmanaged_buffer_allocs++;
+ return YMALLOC(dev->data_bytes_per_chunk);
+
+}
+
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 * buffer, int line_no)
+{
+ int i;
+
+ dev->temp_in_use--;
+
+ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+ if (dev->temp_buffer[i].buffer == buffer) {
+ dev->temp_buffer[i].line = 0;
+ return;
+ }
+ }
+
+ if (buffer) {
+ /* assume it is an unmanaged one. */
+ T(YAFFS_TRACE_BUFFERS,
+ (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
+ line_no));
+ YFREE(buffer);
+ dev->unmanaged_buffer_deallocs++;
+ }
+
+}
+
+/*
+ * Determine if we have a managed buffer.
+ */
+int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 * buffer)
+{
+ int i;
+
+ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+ if (dev->temp_buffer[i].buffer == buffer)
+ return 1;
+ }
+
+ for (i = 0; i < dev->param.n_caches; i++) {
+ if (dev->cache[i].data == buffer)
+ return 1;
+ }
+
+ if (buffer == dev->checkpt_buffer)
+ return 1;
+
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
+ return 0;
+}
+
+/*
+ * Verification code
+ */
+
+/*
+ * Simple hash function. Needs to have a reasonable spread
+ */
+
+static Y_INLINE int yaffs_hash_fn(int n)
+{
+ n = abs(n);
+ return n % YAFFS_NOBJECT_BUCKETS;
+}
+
+/*
+ * Access functions to useful fake objects.
+ * Note that root might have a presence in NAND if permissions are set.
+ */
+
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
+{
+ return dev->root_dir;
+}
+
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
+{
+ return dev->lost_n_found;
+}
+
+/*
+ * Erased NAND checking functions
+ */
+
+int yaffs_check_ff(u8 * buffer, int n_bytes)
+{
+ /* Horrible, slow implementation */
+ while (n_bytes--) {
+ if (*buffer != 0xFF)
+ return 0;
+ buffer++;
+ }
+ return 1;
+}
+
+static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
+{
+ int retval = YAFFS_OK;
+ u8 *data = yaffs_get_temp_buffer(dev, __LINE__);
+ struct yaffs_ext_tags tags;
+ int result;
+
+ result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
+
+ if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
+ retval = YAFFS_FAIL;
+
+ if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) || tags.chunk_used) {
+ T(YAFFS_TRACE_NANDACCESS,
+ (TSTR("Chunk %d not erased" TENDSTR), nand_chunk));
+ retval = YAFFS_FAIL;
+ }
+
+ yaffs_release_temp_buffer(dev, data, __LINE__);
+
+ return retval;
+
+}
+
+static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
+ int nand_chunk,
+ const u8 * data,
+ struct yaffs_ext_tags *tags)
+{
+ int retval = YAFFS_OK;
+ struct yaffs_ext_tags temp_tags;
+ u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
+ int result;
+
+ result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
+ if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
+ temp_tags.obj_id != tags->obj_id ||
+ temp_tags.chunk_id != tags->chunk_id ||
+ temp_tags.n_bytes != tags->n_bytes)
+ retval = YAFFS_FAIL;
+
+ yaffs_release_temp_buffer(dev, buffer, __LINE__);
+
+ return retval;
+}
+
+static int yaffs_write_new_chunk(struct yaffs_dev *dev,
+ const u8 * data,
+ struct yaffs_ext_tags *tags, int use_reserver)
+{
+ int attempts = 0;
+ int write_ok = 0;
+ int chunk;
+
+ yaffs2_checkpt_invalidate(dev);
+
+ do {
+ struct yaffs_block_info *bi = 0;
+ int erased_ok = 0;
+
+ chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
+ if (chunk < 0) {
+ /* no space */
+ break;
+ }
+
+ /* First check this chunk is erased, if it needs
+ * checking. The checking policy (unless forced
+ * always on) is as follows:
+ *
+ * Check the first page we try to write in a block.
+ * If the check passes then we don't need to check any
+ * more. If the check fails, we check again...
+ * If the block has been erased, we don't need to check.
+ *
+ * However, if the block has been prioritised for gc,
+ * then we think there might be something odd about
+ * this block and stop using it.
+ *
+ * Rationale: We should only ever see chunks that have
+ * not been erased if there was a partially written
+ * chunk due to power loss. This checking policy should
+ * catch that case with very few checks and thus save a
+ * lot of checks that are most likely not needed.
+ *
+ * Mods to the above
+ * If an erase check fails or the write fails we skip the
+ * rest of the block.
+ */
+
+ /* let's give it a try */
+ attempts++;
+
+ if (dev->param.always_check_erased)
+ bi->skip_erased_check = 0;
+
+ if (!bi->skip_erased_check) {
+ erased_ok = yaffs_check_chunk_erased(dev, chunk);
+ if (erased_ok != YAFFS_OK) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR("**>> yaffs chunk %d was not erased"
+ TENDSTR), chunk));
+
+ /* If not erased, delete this one,
+ * skip rest of block and
+ * try another chunk */
+ yaffs_chunk_del(dev, chunk, 1, __LINE__);
+ yaffs_skip_rest_of_block(dev);
+ continue;
+ }
+ }
+
+ write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
+
+ if (!bi->skip_erased_check)
+ write_ok =
+ yaffs_verify_chunk_written(dev, chunk, data, tags);
+
+ if (write_ok != YAFFS_OK) {
+ /* Clean up aborted write, skip to next block and
+ * try another chunk */
+ yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
+ continue;
+ }
+
+ bi->skip_erased_check = 1;
+
+ /* Copy the data into the robustification buffer */
+ yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
+
+ } while (write_ok != YAFFS_OK &&
+ (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
+
+ if (!write_ok)
+ chunk = -1;
+
+ if (attempts > 1) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR("**>> yaffs write required %d attempts" TENDSTR),
+ attempts));
+
+ dev->n_retired_writes += (attempts - 1);
+ }
+
+ return chunk;
+}
+
+/*
+ * Block retiring for handling a broken block.
+ */
+
+static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
+{
+ struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
+
+ yaffs2_checkpt_invalidate(dev);
+
+ yaffs2_clear_oldest_dirty_seq(dev, bi);
+
+ if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
+ if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("yaffs: Failed to mark bad and erase block %d"
+ TENDSTR), flash_block));
+ } else {
+ struct yaffs_ext_tags tags;
+ int chunk_id =
+ flash_block * dev->param.chunks_per_block;
+
+ u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
+
+ memset(buffer, 0xff, dev->data_bytes_per_chunk);
+ yaffs_init_tags(&tags);
+ tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
+ if (dev->param.write_chunk_tags_fn(dev, chunk_id -
+ dev->chunk_offset,
+ buffer,
+ &tags) != YAFFS_OK)
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("yaffs: Failed to "
+ TCONT("write bad block marker to block %d")
+ TENDSTR), flash_block));
+
+ yaffs_release_temp_buffer(dev, buffer, __LINE__);
+ }
+ }
+
+ bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+ bi->gc_prioritise = 0;
+ bi->needs_retiring = 0;
+
+ dev->n_retired_blocks++;
+}
+
+/*
+ * Functions for robustisizing TODO
+ *
+ */
+
+static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
+ const u8 * data,
+ const struct yaffs_ext_tags *tags)
+{
+ dev = dev;
+ nand_chunk = nand_chunk;
+ data = data;
+ tags = tags;
+}
+
+static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
+ const struct yaffs_ext_tags *tags)
+{
+ dev = dev;
+ nand_chunk = nand_chunk;
+ tags = tags;
+}
+
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+ struct yaffs_block_info *bi)
+{
+ if (!bi->gc_prioritise) {
+ bi->gc_prioritise = 1;
+ dev->has_pending_prioritised_gc = 1;
+ bi->chunk_error_strikes++;
+
+ if (bi->chunk_error_strikes > 3) {
+ bi->needs_retiring = 1; /* Too many stikes, so retire this */
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR("yaffs: Block struck out" TENDSTR)));
+
+ }
+ }
+}
+
+static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
+ int erased_ok)
+{
+ int flash_block = nand_chunk / dev->param.chunks_per_block;
+ struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
+
+ yaffs_handle_chunk_error(dev, bi);
+
+ if (erased_ok) {
+ /* Was an actual write failure, so mark the block for retirement */
+ bi->needs_retiring = 1;
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("**>> Block %d needs retiring" TENDSTR), flash_block));
+ }
+
+ /* Delete the chunk */
+ yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+ yaffs_skip_rest_of_block(dev);
+}
+
+/*---------------- Name handling functions ------------*/
+
+static u16 yaffs_calc_name_sum(const YCHAR * name)
+{
+ u16 sum = 0;
+ u16 i = 1;
+
+ const YUCHAR *bname = (const YUCHAR *)name;
+ if (bname) {
+ while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH / 2))) {
+
+ /* 0x1f mask is case insensitive */
+ sum += ((*bname) & 0x1f) * i;
+ i++;
+ bname++;
+ }
+ }
+ return sum;
+}
+
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
+{
+#ifndef CONFIG_YAFFS_NO_SHORT_NAMES
+ memset(obj->short_name, 0, sizeof(obj->short_name));
+ if (name &&
+ yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
+ YAFFS_SHORT_NAME_LENGTH)
+ yaffs_strcpy(obj->short_name, name);
+ else
+ obj->short_name[0] = _Y('\0');
+#endif
+ obj->sum = yaffs_calc_name_sum(name);
+}
+
+void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
+ const struct yaffs_obj_hdr *oh)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+ YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
+ memset(tmp_name, 0, sizeof(tmp_name));
+ yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
+ YAFFS_MAX_NAME_LENGTH + 1);
+ yaffs_set_obj_name(obj, tmp_name);
+#else
+ yaffs_set_obj_name(obj, oh->name);
+#endif
+}
+
+/*-------------------- TNODES -------------------
+
+ * List of spare tnodes
+ * The list is hooked together using the first pointer
+ * in the tnode.
+ */
+
+struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
+{
+ struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
+ if (tn) {
+ memset(tn, 0, dev->tnode_size);
+ dev->n_tnodes++;
+ }
+
+ dev->checkpoint_blocks_required = 0; /* force recalculation */
+
+ return tn;
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+ yaffs_free_raw_tnode(dev, tn);
+ dev->n_tnodes--;
+ dev->checkpoint_blocks_required = 0; /* force recalculation */
+}
+
+static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
+{
+ yaffs_deinit_raw_tnodes_and_objs(dev);
+ dev->n_obj = 0;
+ dev->n_tnodes = 0;
+}
+
+void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+ unsigned pos, unsigned val)
+{
+ u32 *map = (u32 *) tn;
+ u32 bit_in_map;
+ u32 bit_in_word;
+ u32 word_in_map;
+ u32 mask;
+
+ pos &= YAFFS_TNODES_LEVEL0_MASK;
+ val >>= dev->chunk_grp_bits;
+
+ bit_in_map = pos * dev->tnode_width;
+ word_in_map = bit_in_map / 32;
+ bit_in_word = bit_in_map & (32 - 1);
+
+ mask = dev->tnode_mask << bit_in_word;
+
+ map[word_in_map] &= ~mask;
+ map[word_in_map] |= (mask & (val << bit_in_word));
+
+ if (dev->tnode_width > (32 - bit_in_word)) {
+ bit_in_word = (32 - bit_in_word);
+ word_in_map++;;
+ mask =
+ dev->tnode_mask >> ( /*dev->tnode_width - */ bit_in_word);
+ map[word_in_map] &= ~mask;
+ map[word_in_map] |= (mask & (val >> bit_in_word));
+ }
+}
+
+u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+ unsigned pos)
+{
+ u32 *map = (u32 *) tn;
+ u32 bit_in_map;
+ u32 bit_in_word;
+ u32 word_in_map;
+ u32 val;
+
+ pos &= YAFFS_TNODES_LEVEL0_MASK;
+
+ bit_in_map = pos * dev->tnode_width;
+ word_in_map = bit_in_map / 32;
+ bit_in_word = bit_in_map & (32 - 1);
+
+ val = map[word_in_map] >> bit_in_word;
+
+ if (dev->tnode_width > (32 - bit_in_word)) {
+ bit_in_word = (32 - bit_in_word);
+ word_in_map++;;
+ val |= (map[word_in_map] << bit_in_word);
+ }
+
+ val &= dev->tnode_mask;
+ val <<= dev->chunk_grp_bits;
+
+ return val;
+}
+
+/* ------------------- End of individual tnode manipulation -----------------*/
+
+/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
+ * The look up tree is represented by the top tnode and the number of top_level
+ * in the tree. 0 means only the level 0 tnode is in the tree.
+ */
+
+/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
+struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
+ struct yaffs_file_var *file_struct,
+ u32 chunk_id)
+{
+ struct yaffs_tnode *tn = file_struct->top;
+ u32 i;
+ int required_depth;
+ int level = file_struct->top_level;
+
+ dev = dev;
+
+ /* Check sane level and chunk Id */
+ if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
+ return NULL;
+
+ if (chunk_id > YAFFS_MAX_CHUNK_ID)
+ return NULL;
+
+ /* First check we're tall enough (ie enough top_level) */
+
+ i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+ required_depth = 0;
+ while (i) {
+ i >>= YAFFS_TNODES_INTERNAL_BITS;
+ required_depth++;
+ }
+
+ if (required_depth > file_struct->top_level)
+ return NULL; /* Not tall enough, so we can't find it */
+
+ /* Traverse down to level 0 */
+ while (level > 0 && tn) {
+ tn = tn->internal[(chunk_id >>
+ (YAFFS_TNODES_LEVEL0_BITS +
+ (level - 1) *
+ YAFFS_TNODES_INTERNAL_BITS)) &
+ YAFFS_TNODES_INTERNAL_MASK];
+ level--;
+ }
+
+ return tn;
+}
+
+/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
+ * This happens in two steps:
+ * 1. If the tree isn't tall enough, then make it taller.
+ * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+ *
+ * Used when modifying the tree.
+ *
+ * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
+ * be plugged into the ttree.
+ */
+
+struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
+ struct yaffs_file_var *file_struct,
+ u32 chunk_id,
+ struct yaffs_tnode *passed_tn)
+{
+ int required_depth;
+ int i;
+ int l;
+ struct yaffs_tnode *tn;
+
+ u32 x;
+
+ /* Check sane level and page Id */
+ if (file_struct->top_level < 0
+ || file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
+ return NULL;
+
+ if (chunk_id > YAFFS_MAX_CHUNK_ID)
+ return NULL;
+
+ /* First check we're tall enough (ie enough top_level) */
+
+ x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+ required_depth = 0;
+ while (x) {
+ x >>= YAFFS_TNODES_INTERNAL_BITS;
+ required_depth++;
+ }
+
+ if (required_depth > file_struct->top_level) {
+ /* Not tall enough, gotta make the tree taller */
+ for (i = file_struct->top_level; i < required_depth; i++) {
+
+ tn = yaffs_get_tnode(dev);
+
+ if (tn) {
+ tn->internal[0] = file_struct->top;
+ file_struct->top = tn;
+ file_struct->top_level++;
+ } else {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR("yaffs: no more tnodes" TENDSTR)));
+ return NULL;
+ }
+ }
+ }
+
+ /* Traverse down to level 0, adding anything we need */
+
+ l = file_struct->top_level;
+ tn = file_struct->top;
+
+ if (l > 0) {
+ while (l > 0 && tn) {
+ x = (chunk_id >>
+ (YAFFS_TNODES_LEVEL0_BITS +
+ (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
+ YAFFS_TNODES_INTERNAL_MASK;
+
+ if ((l > 1) && !tn->internal[x]) {
+ /* Add missing non-level-zero tnode */
+ tn->internal[x] = yaffs_get_tnode(dev);
+ if (!tn->internal[x])
+ return NULL;
+ } else if (l == 1) {
+ /* Looking from level 1 at level 0 */
+ if (passed_tn) {
+ /* If we already have one, then release it. */
+ if (tn->internal[x])
+ yaffs_free_tnode(dev,
+ tn->
+ internal[x]);
+ tn->internal[x] = passed_tn;
+
+ } else if (!tn->internal[x]) {
+ /* Don't have one, none passed in */
+ tn->internal[x] = yaffs_get_tnode(dev);
+ if (!tn->internal[x])
+ return NULL;
+ }
+ }
+
+ tn = tn->internal[x];
+ l--;
+ }
+ } else {
+ /* top is level 0 */
+ if (passed_tn) {
+ memcpy(tn, passed_tn,
+ (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
+ yaffs_free_tnode(dev, passed_tn);
+ }
+ }
+
+ return tn;
+}
+
+static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
+ struct yaffs_ext_tags *tags, int obj_id,
+ int inode_chunk)
+{
+ int j;
+
+ for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
+ if (yaffs_check_chunk_bit
+ (dev, the_chunk / dev->param.chunks_per_block,
+ the_chunk % dev->param.chunks_per_block)) {
+
+ if (dev->chunk_grp_size == 1)
+ return the_chunk;
+ else {
+ yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
+ tags);
+ if (yaffs_tags_match(tags, obj_id, inode_chunk)) {
+ /* found it; */
+ return the_chunk;
+ }
+ }
+ }
+ the_chunk++;
+ }
+ return -1;
+}
+
+static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
+{
+ struct yaffs_block_info *the_block;
+ unsigned block_no;
+
+ T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
+
+ block_no = chunk / dev->param.chunks_per_block;
+ the_block = yaffs_get_block_info(dev, block_no);
+ if (the_block) {
+ the_block->soft_del_pages++;
+ dev->n_free_chunks++;
+ yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
+ }
+}
+
+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls the chunk out
+ * of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
+ */
+
+static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
+ u32 level, int chunk_offset)
+{
+ int i;
+ int the_chunk;
+ int all_done = 1;
+ struct yaffs_dev *dev = in->my_dev;
+
+ if (tn) {
+ if (level > 0) {
+
+ for (i = YAFFS_NTNODES_INTERNAL - 1; all_done && i >= 0;
+ i--) {
+ if (tn->internal[i]) {
+ all_done =
+ yaffs_soft_del_worker(in,
+ tn->internal
+ [i],
+ level - 1,
+ (chunk_offset
+ <<
+ YAFFS_TNODES_INTERNAL_BITS)
+ + i);
+ if (all_done) {
+ yaffs_free_tnode(dev,
+ tn->internal
+ [i]);
+ tn->internal[i] = NULL;
+ } else {
+ /* Hoosterman... how could this happen? */
+ }
+ }
+ }
+ return (all_done) ? 1 : 0;
+ } else if (level == 0) {
+
+ for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+ the_chunk = yaffs_get_group_base(dev, tn, i);
+ if (the_chunk) {
+ /* Note this does not find the real chunk, only the chunk group.
+ * We make an assumption that a chunk group is not larger than
+ * a block.
+ */
+ yaffs_soft_del_chunk(dev, the_chunk);
+ yaffs_load_tnode_0(dev, tn, i, 0);
+ }
+
+ }
+ return 1;
+
+ }
+
+ }
+
+ return 1;
+
+}
+
+static void yaffs_soft_del_file(struct yaffs_obj *obj)
+{
+ if (obj->deleted &&
+ obj->variant_type == YAFFS_OBJECT_TYPE_FILE && !obj->soft_del) {
+ if (obj->n_data_chunks <= 0) {
+ /* Empty file with no duplicate object headers, just delete it immediately */
+ yaffs_free_tnode(obj->my_dev,
+ obj->variant.file_variant.top);
+ obj->variant.file_variant.top = NULL;
+ T(YAFFS_TRACE_TRACING,
+ (TSTR("yaffs: Deleting empty file %d" TENDSTR),
+ obj->obj_id));
+ yaffs_generic_obj_del(obj);
+ } else {
+ yaffs_soft_del_worker(obj,
+ obj->variant.file_variant.top,
+ obj->variant.
+ file_variant.top_level, 0);
+ obj->soft_del = 1;
+ }
+ }
+}
+
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ *
+ * This function is recursive. For levels > 0 the function is called again on
+ * any sub-tree. For level == 0 we just check if the sub-tree has data.
+ * If there is no data in a subtree then it is pruned.
+ */
+
+static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
+ struct yaffs_tnode *tn, u32 level,
+ int del0)
+{
+ int i;
+ int has_data;
+
+ if (tn) {
+ has_data = 0;
+
+ if (level > 0) {
+ for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+ if (tn->internal[i]) {
+ tn->internal[i] =
+ yaffs_prune_worker(dev,
+ tn->internal[i],
+ level - 1,
+ (i ==
+ 0) ? del0 : 1);
+ }
+
+ if (tn->internal[i])
+ has_data++;
+ }
+ } else {
+ int tnode_size_u32 = dev->tnode_size / sizeof(u32);
+ u32 *map = (u32 *) tn;
+
+ for (i = 0; !has_data && i < tnode_size_u32; i++) {
+ if (map[i])
+ has_data++;
+ }
+ }
+
+ if (has_data == 0 && del0) {
+ /* Free and return NULL */
+
+ yaffs_free_tnode(dev, tn);
+ tn = NULL;
+ }
+
+ }
+
+ return tn;
+
+}
+
+static int yaffs_prune_tree(struct yaffs_dev *dev,
+ struct yaffs_file_var *file_struct)
+{
+ int i;
+ int has_data;
+ int done = 0;
+ struct yaffs_tnode *tn;
+
+ if (file_struct->top_level > 0) {
+ file_struct->top =
+ yaffs_prune_worker(dev, file_struct->top,
+ file_struct->top_level, 0);
+
+ /* Now we have a tree with all the non-zero branches NULL but the height
+ * is the same as it was.
+ * Let's see if we can trim internal tnodes to shorten the tree.
+ * We can do this if only the 0th element in the tnode is in use
+ * (ie all the non-zero are NULL)
+ */
+
+ while (file_struct->top_level && !done) {
+ tn = file_struct->top;
+
+ has_data = 0;
+ for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+ if (tn->internal[i])
+ has_data++;
+ }
+
+ if (!has_data) {
+ file_struct->top = tn->internal[0];
+ file_struct->top_level--;
+ yaffs_free_tnode(dev, tn);
+ } else {
+ done = 1;
+ }
+ }
+ }
+
+ return YAFFS_OK;
+}
+
+/*-------------------- End of File Structure functions.-------------------*/
+
+/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
+static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
+{
+ struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
+
+ if (obj) {
+ dev->n_obj++;
+
+ /* Now sweeten it up... */
+
+ memset(obj, 0, sizeof(struct yaffs_obj));
+ obj->being_created = 1;
+
+ obj->my_dev = dev;
+ obj->hdr_chunk = 0;
+ obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
+ INIT_LIST_HEAD(&(obj->hard_links));
+ INIT_LIST_HEAD(&(obj->hash_link));
+ INIT_LIST_HEAD(&obj->siblings);
+
+ /* Now make the directory sane */
+ if (dev->root_dir) {
+ obj->parent = dev->root_dir;
+ list_add(&(obj->siblings),
+ &dev->root_dir->variant.dir_variant.children);
+ }
+
+ /* Add it to the lost and found directory.
+ * NB Can't put root or lost-n-found in lost-n-found so
+ * check if lost-n-found exists first
+ */
+ if (dev->lost_n_found)
+ yaffs_add_obj_to_dir(dev->lost_n_found, obj);
+
+ obj->being_created = 0;
+ }
+
+ dev->checkpoint_blocks_required = 0; /* force recalculation */
+
+ return obj;
+}
+
+static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
+ int number, u32 mode)
+{
+
+ struct yaffs_obj *obj =
+ yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
+ if (obj) {
+ obj->fake = 1; /* it is fake so it might have no NAND presence... */
+ obj->rename_allowed = 0; /* ... and we're not allowed to rename it... */
+ obj->unlink_allowed = 0; /* ... or unlink it */
+ obj->deleted = 0;
+ obj->unlinked = 0;
+ obj->yst_mode = mode;
+ obj->my_dev = dev;
+ obj->hdr_chunk = 0; /* Not a valid chunk. */
+ }
+
+ return obj;
+
+}
+
+static void yaffs_unhash_obj(struct yaffs_obj *obj)
+{
+ int bucket;
+ struct yaffs_dev *dev = obj->my_dev;
+
+ /* If it is still linked into the bucket list, free from the list */
+ if (!list_empty(&obj->hash_link)) {
+ list_del_init(&obj->hash_link);
+ bucket = yaffs_hash_fn(obj->obj_id);
+ dev->obj_bucket[bucket].count--;
+ }
+}
+
+/* FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_free_obj(struct yaffs_obj *obj)
+{
+ struct yaffs_dev *dev = obj->my_dev;
+
+ T(YAFFS_TRACE_OS,
+ (TSTR("FreeObject %p inode %p" TENDSTR), obj, obj->my_inode));
+
+ if (!obj)
+ YBUG();
+ if (obj->parent)
+ YBUG();
+ if (!list_empty(&obj->siblings))
+ YBUG();
+
+ if (obj->my_inode) {
+ /* We're still hooked up to a cached inode.
+ * Don't delete now, but mark for later deletion
+ */
+ obj->defered_free = 1;
+ return;
+ }
+
+ yaffs_unhash_obj(obj);
+
+ yaffs_free_raw_obj(dev, obj);
+ dev->n_obj--;
+ dev->checkpoint_blocks_required = 0; /* force recalculation */
+}
+
+void yaffs_handle_defered_free(struct yaffs_obj *obj)
+{
+ if (obj->defered_free)
+ yaffs_free_obj(obj);
+}
+
+static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
+{
+ int i;
+
+ dev->n_obj = 0;
+ dev->n_tnodes = 0;
+
+ yaffs_init_raw_tnodes_and_objs(dev);
+
+ for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+ INIT_LIST_HEAD(&dev->obj_bucket[i].list);
+ dev->obj_bucket[i].count = 0;
+ }
+}
+
+static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
+{
+ int i;
+ int l = 999;
+ int lowest = 999999;
+
+ /* Search for the shortest list or one that
+ * isn't too long.
+ */
+
+ for (i = 0; i < 10 && lowest > 4; i++) {
+ dev->bucket_finder++;
+ dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
+ if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
+ lowest = dev->obj_bucket[dev->bucket_finder].count;
+ l = dev->bucket_finder;
+ }
+
+ }
+
+ return l;
+}
+
+static int yaffs_new_obj_id(struct yaffs_dev *dev)
+{
+ int bucket = yaffs_find_nice_bucket(dev);
+
+ /* Now find an object value that has not already been taken
+ * by scanning the list.
+ */
+
+ int found = 0;
+ struct list_head *i;
+
+ u32 n = (u32) bucket;
+
+ /* yaffs_check_obj_hash_sane(); */
+
+ while (!found) {
+ found = 1;
+ n += YAFFS_NOBJECT_BUCKETS;
+ if (1 || dev->obj_bucket[bucket].count > 0) {
+ list_for_each(i, &dev->obj_bucket[bucket].list) {
+ /* If there is already one in the list */
+ if (i && list_entry(i, struct yaffs_obj,
+ hash_link)->obj_id == n) {
+ found = 0;
+ }
+ }
+ }
+ }
+
+ return n;
+}
+
+static void yaffs_hash_obj(struct yaffs_obj *in)
+{
+ int bucket = yaffs_hash_fn(in->obj_id);
+ struct yaffs_dev *dev = in->my_dev;
+
+ list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
+ dev->obj_bucket[bucket].count++;
+}
+
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
+{
+ int bucket = yaffs_hash_fn(number);
+ struct list_head *i;
+ struct yaffs_obj *in;
+
+ list_for_each(i, &dev->obj_bucket[bucket].list) {
+ /* Look if it is in the list */
+ if (i) {
+ in = list_entry(i, struct yaffs_obj, hash_link);
+ if (in->obj_id == number) {
+
+ /* Don't tell the VFS about this one if it is defered free */
+ if (in->defered_free)
+ return NULL;
+
+ return in;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
+ enum yaffs_obj_type type)
+{
+ struct yaffs_obj *the_obj = NULL;
+ struct yaffs_tnode *tn = NULL;
+
+ if (number < 0)
+ number = yaffs_new_obj_id(dev);
+
+ if (type == YAFFS_OBJECT_TYPE_FILE) {
+ tn = yaffs_get_tnode(dev);
+ if (!tn)
+ return NULL;
+ }
+
+ the_obj = yaffs_alloc_empty_obj(dev);
+ if (!the_obj) {
+ if (tn)
+ yaffs_free_tnode(dev, tn);
+ return NULL;
+ }
+
+ if (the_obj) {
+ the_obj->fake = 0;
+ the_obj->rename_allowed = 1;
+ the_obj->unlink_allowed = 1;
+ the_obj->obj_id = number;
+ yaffs_hash_obj(the_obj);
+ the_obj->variant_type = type;
+ yaffs_load_current_time(the_obj, 1, 1);
+
+ switch (type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ the_obj->variant.file_variant.file_size = 0;
+ the_obj->variant.file_variant.scanned_size = 0;
+ the_obj->variant.file_variant.shrink_size = ~0; /* max */
+ the_obj->variant.file_variant.top_level = 0;
+ the_obj->variant.file_variant.top = tn;
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
+ INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ /* No action required */
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* todo this should not happen */
+ break;
+ }
+ }
+
+ return the_obj;
+}
+
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+ int number,
+ enum yaffs_obj_type type)
+{
+ struct yaffs_obj *the_obj = NULL;
+
+ if (number > 0)
+ the_obj = yaffs_find_by_number(dev, number);
+
+ if (!the_obj)
+ the_obj = yaffs_new_obj(dev, number, type);
+
+ return the_obj;
+
+}
+
+YCHAR *yaffs_clone_str(const YCHAR * str)
+{
+ YCHAR *new_str = NULL;
+ int len;
+
+ if (!str)
+ str = _Y("");
+
+ len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
+ new_str = YMALLOC((len + 1) * sizeof(YCHAR));
+ if (new_str) {
+ yaffs_strncpy(new_str, str, len);
+ new_str[len] = 0;
+ }
+ return new_str;
+
+}
+
+/*
+ * Mknod (create) a new object.
+ * equiv_obj only has meaning for a hard link;
+ * alias_str only has meaning for a symlink.
+ * rdev only has meaning for devices (a subset of special objects)
+ */
+
+static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
+ struct yaffs_obj *parent,
+ const YCHAR * name,
+ u32 mode,
+ u32 uid,
+ u32 gid,
+ struct yaffs_obj *equiv_obj,
+ const YCHAR * alias_str, u32 rdev)
+{
+ struct yaffs_obj *in;
+ YCHAR *str = NULL;
+
+ struct yaffs_dev *dev = parent->my_dev;
+
+ /* Check if the entry exists. If it does then fail the call since we don't want a dup. */
+ if (yaffs_find_by_name(parent, name))
+ return NULL;
+
+ if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+ str = yaffs_clone_str(alias_str);
+ if (!str)
+ return NULL;
+ }
+
+ in = yaffs_new_obj(dev, -1, type);
+
+ if (!in) {
+ if (str)
+ YFREE(str);
+ return NULL;
+ }
+
+ if (in) {
+ in->hdr_chunk = 0;
+ in->valid = 1;
+ in->variant_type = type;
+
+ in->yst_mode = mode;
+
+ yaffs_attribs_init(in, gid, uid, rdev);
+
+ in->n_data_chunks = 0;
+
+ yaffs_set_obj_name(in, name);
+ in->dirty = 1;
+
+ yaffs_add_obj_to_dir(parent, in);
+
+ in->my_dev = parent->my_dev;
+
+ switch (type) {
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ in->variant.symlink_variant.alias = str;
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ in->variant.hardlink_variant.equiv_obj = equiv_obj;
+ in->variant.hardlink_variant.equiv_id =
+ equiv_obj->obj_id;
+ list_add(&in->hard_links, &equiv_obj->hard_links);
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* do nothing */
+ break;
+ }
+
+ if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
+ /* Could not create the object header, fail the creation */
+ yaffs_del_obj(in);
+ in = NULL;
+ }
+
+ yaffs_update_parent(parent);
+ }
+
+ return in;
+}
+
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+ const YCHAR * name, u32 mode, u32 uid,
+ u32 gid)
+{
+ return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+ uid, gid, NULL, NULL, 0);
+}
+
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR * name,
+ u32 mode, u32 uid, u32 gid)
+{
+ return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+ mode, uid, gid, NULL, NULL, 0);
+}
+
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+ const YCHAR * name, u32 mode, u32 uid,
+ u32 gid, u32 rdev)
+{
+ return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+ uid, gid, NULL, NULL, rdev);
+}
+
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+ const YCHAR * name, u32 mode, u32 uid,
+ u32 gid, const YCHAR * alias)
+{
+ return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+ uid, gid, NULL, alias, 0);
+}
+
+/* yaffs_link_obj returns the object id of the equivalent object.*/
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
+ struct yaffs_obj *equiv_obj)
+{
+ /* Get the real object in case we were fed a hard link as an equivalent object */
+ equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
+
+ if (yaffs_create_obj
+ (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
+ equiv_obj, NULL, 0)) {
+ return equiv_obj;
+ } else {
+ return NULL;
+ }
+
+}
+
+static int yaffs_change_obj_name(struct yaffs_obj *obj,
+ struct yaffs_obj *new_dir,
+ const YCHAR * new_name, int force, int shadows)
+{
+ int unlink_op;
+ int del_op;
+
+ struct yaffs_obj *existing_target;
+
+ if (new_dir == NULL)
+ new_dir = obj->parent; /* use the old directory */
+
+ if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("tragedy: yaffs_change_obj_name: new_dir is not a directory"
+ TENDSTR)));
+ YBUG();
+ }
+
+ /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
+ if (obj->my_dev->param.is_yaffs2)
+ unlink_op = (new_dir == obj->my_dev->unlinked_dir);
+ else
+ unlink_op = (new_dir == obj->my_dev->unlinked_dir
+ && obj->variant_type == YAFFS_OBJECT_TYPE_FILE);
+
+ del_op = (new_dir == obj->my_dev->del_dir);
+
+ existing_target = yaffs_find_by_name(new_dir, new_name);
+
+ /* If the object is a file going into the unlinked directory,
+ * then it is OK to just stuff it in since duplicate names are allowed.
+ * else only proceed if the new name does not exist and if we're putting
+ * it into a directory.
+ */
+ if ((unlink_op ||
+ del_op ||
+ force ||
+ (shadows > 0) ||
+ !existing_target) &&
+ new_dir->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
+ yaffs_set_obj_name(obj, new_name);
+ obj->dirty = 1;
+
+ yaffs_add_obj_to_dir(new_dir, obj);
+
+ if (unlink_op)
+ obj->unlinked = 1;
+
+ /* If it is a deletion then we mark it as a shrink for gc purposes. */
+ if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >=
+ 0)
+ return YAFFS_OK;
+ }
+
+ return YAFFS_FAIL;
+}
+
+
+/* Note:
+ * If old_name is NULL then we take old_dir as the object to be renamed.
+ */
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
+ struct yaffs_obj *new_dir, const YCHAR * new_name)
+{
+ struct yaffs_obj *obj = NULL;
+ struct yaffs_obj *existing_target = NULL;
+ int force = 0;
+ int result;
+ struct yaffs_dev *dev;
+
+ if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+ YBUG();
+ if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+ YBUG();
+
+ dev = old_dir->my_dev;
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+ /* Special case for case insemsitive systems.
+ * While look-up is case insensitive, the name isn't.
+ * Therefore we might want to change x.txt to X.txt
+ */
+ if (old_dir == new_dir &&
+ old_name && new_name &&
+ yaffs_strcmp(old_name, new_name) == 0)
+ force = 1;
+#endif
+
+ if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
+ YAFFS_MAX_NAME_LENGTH)
+ /* ENAMETOOLONG */
+ return YAFFS_FAIL;
+
+ if(old_name)
+ obj = yaffs_find_by_name(old_dir, old_name);
+ else{
+ obj = old_dir;
+ old_dir = obj->parent;
+ }
+
+
+ if (obj && obj->rename_allowed) {
+
+ /* Now do the handling for an existing target, if there is one */
+
+ existing_target = yaffs_find_by_name(new_dir, new_name);
+ if (yaffs_is_non_empty_dir(existing_target)){
+ return YAFFS_FAIL; /* ENOTEMPTY */
+ } else if (existing_target && existing_target != obj) {
+ /* Nuke the target first, using shadowing,
+ * but only if it isn't the same object.
+ *
+ * Note we must disable gc otherwise it can mess up the shadowing.
+ *
+ */
+ dev->gc_disable = 1;
+ yaffs_change_obj_name(obj, new_dir, new_name, force,
+ existing_target->obj_id);
+ existing_target->is_shadowed = 1;
+ yaffs_unlink_obj(existing_target);
+ dev->gc_disable = 0;
+ }
+
+ result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
+
+ yaffs_update_parent(old_dir);
+ if (new_dir != old_dir)
+ yaffs_update_parent(new_dir);
+
+ return result;
+ }
+ return YAFFS_FAIL;
+}
+
+/*------------------------- Block Management and Page Allocation ----------------*/
+
+static int yaffs_init_blocks(struct yaffs_dev *dev)
+{
+ int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+
+ dev->block_info = NULL;
+ dev->chunk_bits = NULL;
+
+ dev->alloc_block = -1; /* force it to get a new one */
+
+ /* If the first allocation strategy fails, thry the alternate one */
+ dev->block_info = YMALLOC(n_blocks * sizeof(struct yaffs_block_info));
+ if (!dev->block_info) {
+ dev->block_info =
+ YMALLOC_ALT(n_blocks * sizeof(struct yaffs_block_info));
+ dev->block_info_alt = 1;
+ } else {
+ dev->block_info_alt = 0;
+ }
+
+ if (dev->block_info) {
+ /* Set up dynamic blockinfo stuff. */
+ dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8; /* round up bytes */
+ dev->chunk_bits = YMALLOC(dev->chunk_bit_stride * n_blocks);
+ if (!dev->chunk_bits) {
+ dev->chunk_bits =
+ YMALLOC_ALT(dev->chunk_bit_stride * n_blocks);
+ dev->chunk_bits_alt = 1;
+ } else {
+ dev->chunk_bits_alt = 0;
+ }
+ }
+
+ if (dev->block_info && dev->chunk_bits) {
+ memset(dev->block_info, 0,
+ n_blocks * sizeof(struct yaffs_block_info));
+ memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
+ return YAFFS_OK;
+ }
+
+ return YAFFS_FAIL;
+}
+
+static void yaffs_deinit_blocks(struct yaffs_dev *dev)
+{
+ if (dev->block_info_alt && dev->block_info)
+ YFREE_ALT(dev->block_info);
+ else if (dev->block_info)
+ YFREE(dev->block_info);
+
+ dev->block_info_alt = 0;
+
+ dev->block_info = NULL;
+
+ if (dev->chunk_bits_alt && dev->chunk_bits)
+ YFREE_ALT(dev->chunk_bits);
+ else if (dev->chunk_bits)
+ YFREE(dev->chunk_bits);
+ dev->chunk_bits_alt = 0;
+ dev->chunk_bits = NULL;
+}
+
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
+{
+ struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
+
+ int erased_ok = 0;
+
+ /* If the block is still healthy erase it and mark as clean.
+ * If the block has had a data failure, then retire it.
+ */
+
+ T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+ (TSTR("yaffs_block_became_dirty block %d state %d %s" TENDSTR),
+ block_no, bi->block_state,
+ (bi->needs_retiring) ? "needs retiring" : ""));
+
+ yaffs2_clear_oldest_dirty_seq(dev, bi);
+
+ bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
+
+ /* If this is the block being garbage collected then stop gc'ing this block */
+ if (block_no == dev->gc_block)
+ dev->gc_block = 0;
+
+ /* If this block is currently the best candidate for gc then drop as a candidate */
+ if (block_no == dev->gc_dirtiest) {
+ dev->gc_dirtiest = 0;
+ dev->gc_pages_in_use = 0;
+ }
+
+ if (!bi->needs_retiring) {
+ yaffs2_checkpt_invalidate(dev);
+ erased_ok = yaffs_erase_block(dev, block_no);
+ if (!erased_ok) {
+ dev->n_erase_failures++;
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("**>> Erasure failed %d" TENDSTR), block_no));
+ }
+ }
+
+ if (erased_ok &&
+ ((yaffs_trace_mask & YAFFS_TRACE_ERASE)
+ || !yaffs_skip_verification(dev))) {
+ int i;
+ for (i = 0; i < dev->param.chunks_per_block; i++) {
+ if (!yaffs_check_chunk_erased
+ (dev, block_no * dev->param.chunks_per_block + i)) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ (">>Block %d erasure supposedly OK, but chunk %d not erased"
+ TENDSTR), block_no, i));
+ }
+ }
+ }
+
+ if (erased_ok) {
+ /* Clean it up... */
+ bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+ bi->seq_number = 0;
+ dev->n_erased_blocks++;
+ bi->pages_in_use = 0;
+ bi->soft_del_pages = 0;
+ bi->has_shrink_hdr = 0;
+ bi->skip_erased_check = 1; /* This is clean, so no need to check */
+ bi->gc_prioritise = 0;
+ yaffs_clear_chunk_bits(dev, block_no);
+
+ T(YAFFS_TRACE_ERASE,
+ (TSTR("Erased block %d" TENDSTR), block_no));
+ } else {
+ dev->n_free_chunks -= dev->param.chunks_per_block; /* We lost a block of free space */
+
+ yaffs_retire_block(dev, block_no);
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("**>> Block %d retired" TENDSTR), block_no));
+ }
+}
+
+static int yaffs_find_alloc_block(struct yaffs_dev *dev)
+{
+ int i;
+
+ struct yaffs_block_info *bi;
+
+ if (dev->n_erased_blocks < 1) {
+ /* Hoosterman we've got a problem.
+ * Can't get space to gc
+ */
+ T(YAFFS_TRACE_ERROR,
+ (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
+
+ return -1;
+ }
+
+ /* Find an empty block. */
+
+ for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+ dev->alloc_block_finder++;
+ if (dev->alloc_block_finder < dev->internal_start_block
+ || dev->alloc_block_finder > dev->internal_end_block) {
+ dev->alloc_block_finder = dev->internal_start_block;
+ }
+
+ bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
+
+ if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+ bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
+ dev->seq_number++;
+ bi->seq_number = dev->seq_number;
+ dev->n_erased_blocks--;
+ T(YAFFS_TRACE_ALLOCATE,
+ (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
+ dev->alloc_block_finder, dev->seq_number,
+ dev->n_erased_blocks));
+ return dev->alloc_block_finder;
+ }
+ }
+
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("yaffs tragedy: no more erased blocks, but there should have been %d"
+ TENDSTR), dev->n_erased_blocks));
+
+ return -1;
+}
+
+/*
+ * Check if there's space to allocate...
+ * Thinks.... do we need top make this ths same as yaffs_get_free_chunks()?
+ */
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
+{
+ int reserved_chunks;
+ int reserved_blocks = dev->param.n_reserved_blocks;
+ int checkpt_blocks;
+
+ checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
+
+ reserved_chunks =
+ ((reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block);
+
+ return (dev->n_free_chunks > (reserved_chunks + n_chunks));
+}
+
+static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
+ struct yaffs_block_info **block_ptr)
+{
+ int ret_val;
+ struct yaffs_block_info *bi;
+
+ if (dev->alloc_block < 0) {
+ /* Get next block to allocate off */
+ dev->alloc_block = yaffs_find_alloc_block(dev);
+ dev->alloc_page = 0;
+ }
+
+ if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
+ /* Not enough space to allocate unless we're allowed to use the reserve. */
+ return -1;
+ }
+
+ if (dev->n_erased_blocks < dev->param.n_reserved_blocks
+ && dev->alloc_page == 0) {
+ T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
+ }
+
+ /* Next page please.... */
+ if (dev->alloc_block >= 0) {
+ bi = yaffs_get_block_info(dev, dev->alloc_block);
+
+ ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
+ dev->alloc_page;
+ bi->pages_in_use++;
+ yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
+
+ dev->alloc_page++;
+
+ dev->n_free_chunks--;
+
+ /* If the block is full set the state to full */
+ if (dev->alloc_page >= dev->param.chunks_per_block) {
+ bi->block_state = YAFFS_BLOCK_STATE_FULL;
+ dev->alloc_block = -1;
+ }
+
+ if (block_ptr)
+ *block_ptr = bi;
+
+ return ret_val;
+ }
+
+ T(YAFFS_TRACE_ERROR,
+ (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
+
+ return -1;
+}
+
+static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
+{
+ int n;
+
+ n = dev->n_erased_blocks * dev->param.chunks_per_block;
+
+ if (dev->alloc_block > 0)
+ n += (dev->param.chunks_per_block - dev->alloc_page);
+
+ return n;
+
+}
+
+/*
+ * yaffs_skip_rest_of_block() skips over the rest of the allocation block
+ * if we don't want to write to it.
+ */
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
+{
+ if (dev->alloc_block > 0) {
+ struct yaffs_block_info *bi =
+ yaffs_get_block_info(dev, dev->alloc_block);
+ if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
+ bi->block_state = YAFFS_BLOCK_STATE_FULL;
+ dev->alloc_block = -1;
+ }
+ }
+}
+
+static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
+{
+ int old_chunk;
+ int new_chunk;
+ int mark_flash;
+ int ret_val = YAFFS_OK;
+ int i;
+ int is_checkpt_block;
+ int matching_chunk;
+ int max_copies;
+
+ int chunks_before = yaffs_get_erased_chunks(dev);
+ int chunks_after;
+
+ struct yaffs_ext_tags tags;
+
+ struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
+
+ struct yaffs_obj *object;
+
+ is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
+
+ T(YAFFS_TRACE_TRACING,
+ (TSTR
+ ("Collecting block %d, in use %d, shrink %d, whole_block %d"
+ TENDSTR), block, bi->pages_in_use, bi->has_shrink_hdr,
+ whole_block));
+
+ /*yaffs_verify_free_chunks(dev); */
+
+ if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
+ bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
+
+ bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
+
+ dev->gc_disable = 1;
+
+ if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
+ T(YAFFS_TRACE_TRACING,
+ (TSTR
+ ("Collecting block %d that has no chunks in use" TENDSTR),
+ block));
+ yaffs_block_became_dirty(dev, block);
+ } else {
+
+ u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
+
+ yaffs_verify_blk(dev, bi, block);
+
+ max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
+ old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
+
+ for ( /* init already done */ ;
+ ret_val == YAFFS_OK &&
+ dev->gc_chunk < dev->param.chunks_per_block &&
+ (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
+ max_copies > 0; dev->gc_chunk++, old_chunk++) {
+ if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
+
+ /* This page is in use and might need to be copied off */
+
+ max_copies--;
+
+ mark_flash = 1;
+
+ yaffs_init_tags(&tags);
+
+ yaffs_rd_chunk_tags_nand(dev, old_chunk,
+ buffer, &tags);
+
+ object = yaffs_find_by_number(dev, tags.obj_id);
+
+ T(YAFFS_TRACE_GC_DETAIL,
+ (TSTR
+ ("Collecting chunk in block %d, %d %d %d "
+ TENDSTR), dev->gc_chunk, tags.obj_id,
+ tags.chunk_id, tags.n_bytes));
+
+ if (object && !yaffs_skip_verification(dev)) {
+ if (tags.chunk_id == 0)
+ matching_chunk =
+ object->hdr_chunk;
+ else if (object->soft_del)
+ matching_chunk = old_chunk; /* Defeat the test */
+ else
+ matching_chunk =
+ yaffs_find_chunk_in_file
+ (object, tags.chunk_id,
+ NULL);
+
+ if (old_chunk != matching_chunk)
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("gc: page in gc mismatch: %d %d %d %d"
+ TENDSTR), old_chunk,
+ matching_chunk, tags.obj_id,
+ tags.chunk_id));
+
+ }
+
+ if (!object) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("page %d in gc has no object: %d %d %d "
+ TENDSTR), old_chunk,
+ tags.obj_id, tags.chunk_id,
+ tags.n_bytes));
+ }
+
+ if (object &&
+ object->deleted &&
+ object->soft_del && tags.chunk_id != 0) {
+ /* Data chunk in a soft deleted file, throw it away
+ * It's a soft deleted data chunk,
+ * No need to copy this, just forget about it and
+ * fix up the object.
+ */
+
+ /* Free chunks already includes softdeleted chunks.
+ * How ever this chunk is going to soon be really deleted
+ * which will increment free chunks.
+ * We have to decrement free chunks so this works out properly.
+ */
+ dev->n_free_chunks--;
+ bi->soft_del_pages--;
+
+ object->n_data_chunks--;
+
+ if (object->n_data_chunks <= 0) {
+ /* remeber to clean up the object */
+ dev->gc_cleanup_list[dev->
+ n_clean_ups]
+ = tags.obj_id;
+ dev->n_clean_ups++;
+ }
+ mark_flash = 0;
+ } else if (0) {
+ /* Todo object && object->deleted && object->n_data_chunks == 0 */
+ /* Deleted object header with no data chunks.
+ * Can be discarded and the file deleted.
+ */
+ object->hdr_chunk = 0;
+ yaffs_free_tnode(object->my_dev,
+ object->
+ variant.file_variant.
+ top);
+ object->variant.file_variant.top = NULL;
+ yaffs_generic_obj_del(object);
+
+ } else if (object) {
+ /* It's either a data chunk in a live file or
+ * an ObjectHeader, so we're interested in it.
+ * NB Need to keep the ObjectHeaders of deleted files
+ * until the whole file has been deleted off
+ */
+ tags.serial_number++;
+
+ dev->n_gc_copies++;
+
+ if (tags.chunk_id == 0) {
+ /* It is an object Id,
+ * We need to nuke the shrinkheader flags first
+ * Also need to clean up shadowing.
+ * We no longer want the shrink_header flag since its work is done
+ * and if it is left in place it will mess up scanning.
+ */
+
+ struct yaffs_obj_hdr *oh;
+ oh = (struct yaffs_obj_hdr *)
+ buffer;
+
+ oh->is_shrink = 0;
+ tags.extra_is_shrink = 0;
+
+ oh->shadows_obj = 0;
+ oh->inband_shadowed_obj_id = 0;
+ tags.extra_shadows = 0;
+
+ /* Update file size */
+ if (object->variant_type ==
+ YAFFS_OBJECT_TYPE_FILE) {
+ oh->file_size =
+ object->variant.
+ file_variant.
+ file_size;
+ tags.extra_length =
+ oh->file_size;
+ }
+
+ yaffs_verify_oh(object, oh,
+ &tags, 1);
+ new_chunk =
+ yaffs_write_new_chunk(dev,
+ (u8 *)
+ oh,
+ &tags,
+ 1);
+ } else {
+ new_chunk =
+ yaffs_write_new_chunk(dev,
+ buffer,
+ &tags,
+ 1);
+ }
+
+ if (new_chunk < 0) {
+ ret_val = YAFFS_FAIL;
+ } else {
+
+ /* Ok, now fix up the Tnodes etc. */
+
+ if (tags.chunk_id == 0) {
+ /* It's a header */
+ object->hdr_chunk =
+ new_chunk;
+ object->serial =
+ tags.serial_number;
+ } else {
+ /* It's a data chunk */
+ int ok;
+ ok = yaffs_put_chunk_in_file(object, tags.chunk_id, new_chunk, 0);
+ }
+ }
+ }
+
+ if (ret_val == YAFFS_OK)
+ yaffs_chunk_del(dev, old_chunk,
+ mark_flash, __LINE__);
+
+ }
+ }
+
+ yaffs_release_temp_buffer(dev, buffer, __LINE__);
+
+ }
+
+ yaffs_verify_collected_blk(dev, bi, block);
+
+ if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+ /*
+ * The gc did not complete. Set block state back to FULL
+ * because checkpointing does not restore gc.
+ */
+ bi->block_state = YAFFS_BLOCK_STATE_FULL;
+ } else {
+ /* The gc completed. */
+ /* Do any required cleanups */
+ for (i = 0; i < dev->n_clean_ups; i++) {
+ /* Time to delete the file too */
+ object =
+ yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
+ if (object) {
+ yaffs_free_tnode(dev,
+ object->variant.
+ file_variant.top);
+ object->variant.file_variant.top = NULL;
+ T(YAFFS_TRACE_GC,
+ (TSTR
+ ("yaffs: About to finally delete object %d"
+ TENDSTR), object->obj_id));
+ yaffs_generic_obj_del(object);
+ object->my_dev->n_deleted_files--;
+ }
+
+ }
+
+ chunks_after = yaffs_get_erased_chunks(dev);
+ if (chunks_before >= chunks_after) {
+ T(YAFFS_TRACE_GC,
+ (TSTR
+ ("gc did not increase free chunks before %d after %d"
+ TENDSTR), chunks_before, chunks_after));
+ }
+ dev->gc_block = 0;
+ dev->gc_chunk = 0;
+ dev->n_clean_ups = 0;
+ }
+
+ dev->gc_disable = 0;
+
+ return ret_val;
+}
+
+/*
+ * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough)
+ * for garbage collection.
+ */
+
+static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
+ int aggressive, int background)
+{
+ int i;
+ int iterations;
+ unsigned selected = 0;
+ int prioritised = 0;
+ int prioritised_exist = 0;
+ struct yaffs_block_info *bi;
+ int threshold;
+
+ /* First let's see if we need to grab a prioritised block */
+ if (dev->has_pending_prioritised_gc && !aggressive) {
+ dev->gc_dirtiest = 0;
+ bi = dev->block_info;
+ for (i = dev->internal_start_block;
+ i <= dev->internal_end_block && !selected; i++) {
+
+ if (bi->gc_prioritise) {
+ prioritised_exist = 1;
+ if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+ yaffs_block_ok_for_gc(dev, bi)) {
+ selected = i;
+ prioritised = 1;
+ }
+ }
+ bi++;
+ }
+
+ /*
+ * If there is a prioritised block and none was selected then
+ * this happened because there is at least one old dirty block gumming
+ * up the works. Let's gc the oldest dirty block.
+ */
+
+ if (prioritised_exist &&
+ !selected && dev->oldest_dirty_block > 0)
+ selected = dev->oldest_dirty_block;
+
+ if (!prioritised_exist) /* None found, so we can clear this */
+ dev->has_pending_prioritised_gc = 0;
+ }
+
+ /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
+ * search harder.
+ * else (we're doing a leasurely gc), then we only bother to do this if the
+ * block has only a few pages in use.
+ */
+
+ if (!selected) {
+ int pages_used;
+ int n_blocks =
+ dev->internal_end_block - dev->internal_start_block + 1;
+ if (aggressive) {
+ threshold = dev->param.chunks_per_block;
+ iterations = n_blocks;
+ } else {
+ int max_threshold;
+
+ if (background)
+ max_threshold = dev->param.chunks_per_block / 2;
+ else
+ max_threshold = dev->param.chunks_per_block / 8;
+
+ if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+ max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+
+ threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
+ if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+ threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+ if (threshold > max_threshold)
+ threshold = max_threshold;
+
+ iterations = n_blocks / 16 + 1;
+ if (iterations > 100)
+ iterations = 100;
+ }
+
+ for (i = 0;
+ i < iterations &&
+ (dev->gc_dirtiest < 1 ||
+ dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH); i++) {
+ dev->gc_block_finder++;
+ if (dev->gc_block_finder < dev->internal_start_block ||
+ dev->gc_block_finder > dev->internal_end_block)
+ dev->gc_block_finder =
+ dev->internal_start_block;
+
+ bi = yaffs_get_block_info(dev, dev->gc_block_finder);
+
+ pages_used = bi->pages_in_use - bi->soft_del_pages;
+
+ if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+ pages_used < dev->param.chunks_per_block &&
+ (dev->gc_dirtiest < 1
+ || pages_used < dev->gc_pages_in_use)
+ && yaffs_block_ok_for_gc(dev, bi)) {
+ dev->gc_dirtiest = dev->gc_block_finder;
+ dev->gc_pages_in_use = pages_used;
+ }
+ }
+
+ if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
+ selected = dev->gc_dirtiest;
+ }
+
+ /*
+ * If nothing has been selected for a while, try selecting the oldest dirty
+ * because that's gumming up the works.
+ */
+
+ if (!selected && dev->param.is_yaffs2 &&
+ dev->gc_not_done >= (background ? 10 : 20)) {
+ yaffs2_find_oldest_dirty_seq(dev);
+ if (dev->oldest_dirty_block > 0) {
+ selected = dev->oldest_dirty_block;
+ dev->gc_dirtiest = selected;
+ dev->oldest_dirty_gc_count++;
+ bi = yaffs_get_block_info(dev, selected);
+ dev->gc_pages_in_use =
+ bi->pages_in_use - bi->soft_del_pages;
+ } else {
+ dev->gc_not_done = 0;
+ }
+ }
+
+ if (selected) {
+ T(YAFFS_TRACE_GC,
+ (TSTR
+ ("GC Selected block %d with %d free, prioritised:%d"
+ TENDSTR), selected,
+ dev->param.chunks_per_block - dev->gc_pages_in_use,
+ prioritised));
+
+ dev->n_gc_blocks++;
+ if (background)
+ dev->bg_gcs++;
+
+ dev->gc_dirtiest = 0;
+ dev->gc_pages_in_use = 0;
+ dev->gc_not_done = 0;
+ if (dev->refresh_skip > 0)
+ dev->refresh_skip--;
+ } else {
+ dev->gc_not_done++;
+ T(YAFFS_TRACE_GC,
+ (TSTR
+ ("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s"
+ TENDSTR), dev->gc_block_finder, dev->gc_not_done, threshold,
+ dev->gc_dirtiest, dev->gc_pages_in_use,
+ dev->oldest_dirty_block, background ? " bg" : ""));
+ }
+
+ return selected;
+}
+
+/* New garbage collector
+ * If we're very low on erased blocks then we do aggressive garbage collection
+ * otherwise we do "leasurely" garbage collection.
+ * Aggressive gc looks further (whole array) and will accept less dirty blocks.
+ * Passive gc only inspects smaller areas and will only accept more dirty blocks.
+ *
+ * The idea is to help clear out space in a more spread-out manner.
+ * Dunno if it really does anything useful.
+ */
+static int yaffs_check_gc(struct yaffs_dev *dev, int background)
+{
+ int aggressive = 0;
+ int gc_ok = YAFFS_OK;
+ int max_tries = 0;
+ int min_erased;
+ int erased_chunks;
+ int checkpt_block_adjust;
+
+ if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
+ return YAFFS_OK;
+
+ if (dev->gc_disable) {
+ /* Bail out so we don't get recursive gc */
+ return YAFFS_OK;
+ }
+
+ /* This loop should pass the first time.
+ * We'll only see looping here if the collection does not increase space.
+ */
+
+ do {
+ max_tries++;
+
+ checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
+
+ min_erased =
+ dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
+ erased_chunks =
+ dev->n_erased_blocks * dev->param.chunks_per_block;
+
+ /* If we need a block soon then do aggressive gc. */
+ if (dev->n_erased_blocks < min_erased)
+ aggressive = 1;
+ else {
+ if (!background
+ && erased_chunks > (dev->n_free_chunks / 4))
+ break;
+
+ if (dev->gc_skip > 20)
+ dev->gc_skip = 20;
+ if (erased_chunks < dev->n_free_chunks / 2 ||
+ dev->gc_skip < 1 || background)
+ aggressive = 0;
+ else {
+ dev->gc_skip--;
+ break;
+ }
+ }
+
+ dev->gc_skip = 5;
+
+ /* If we don't already have a block being gc'd then see if we should start another */
+
+ if (dev->gc_block < 1 && !aggressive) {
+ dev->gc_block = yaffs2_find_refresh_block(dev);
+ dev->gc_chunk = 0;
+ dev->n_clean_ups = 0;
+ }
+ if (dev->gc_block < 1) {
+ dev->gc_block =
+ yaffs_find_gc_block(dev, aggressive, background);
+ dev->gc_chunk = 0;
+ dev->n_clean_ups = 0;
+ }
+
+ if (dev->gc_block > 0) {
+ dev->all_gcs++;
+ if (!aggressive)
+ dev->passive_gc_count++;
+
+ T(YAFFS_TRACE_GC,
+ (TSTR
+ ("yaffs: GC n_erased_blocks %d aggressive %d"
+ TENDSTR), dev->n_erased_blocks, aggressive));
+
+ gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
+ }
+
+ if (dev->n_erased_blocks < (dev->param.n_reserved_blocks)
+ && dev->gc_block > 0) {
+ T(YAFFS_TRACE_GC,
+ (TSTR
+ ("yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d"
+ TENDSTR), dev->n_erased_blocks, max_tries,
+ dev->gc_block));
+ }
+ } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
+ (dev->gc_block > 0) && (max_tries < 2));
+
+ return aggressive ? gc_ok : YAFFS_OK;
+}
+
+/*
+ * yaffs_bg_gc()
+ * Garbage collects. Intended to be called from a background thread.
+ * Returns non-zero if at least half the free chunks are erased.
+ */
+int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
+{
+ int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
+
+ T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc %u" TENDSTR), urgency));
+
+ yaffs_check_gc(dev, 1);
+ return erased_chunks > dev->n_free_chunks / 2;
+}
+
+/*------------------------- TAGS --------------------------------*/
+
+static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
+ int chunk_obj)
+{
+ return (tags->chunk_id == chunk_obj &&
+ tags->obj_id == obj_id && !tags->is_deleted) ? 1 : 0;
+
+}
+
+/*-------------------- Data file manipulation -----------------*/
+
+static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+ struct yaffs_ext_tags *tags)
+{
+ /*Get the Tnode, then get the level 0 offset chunk offset */
+ struct yaffs_tnode *tn;
+ int the_chunk = -1;
+ struct yaffs_ext_tags local_tags;
+ int ret_val = -1;
+
+ struct yaffs_dev *dev = in->my_dev;
+
+ if (!tags) {
+ /* Passed a NULL, so use our own tags space */
+ tags = &local_tags;
+ }
+
+ tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+
+ if (tn) {
+ the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+ ret_val =
+ yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+ inode_chunk);
+ }
+ return ret_val;
+}
+
+static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
+ struct yaffs_ext_tags *tags)
+{
+ /* Get the Tnode, then get the level 0 offset chunk offset */
+ struct yaffs_tnode *tn;
+ int the_chunk = -1;
+ struct yaffs_ext_tags local_tags;
+
+ struct yaffs_dev *dev = in->my_dev;
+ int ret_val = -1;
+
+ if (!tags) {
+ /* Passed a NULL, so use our own tags space */
+ tags = &local_tags;
+ }
+
+ tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+
+ if (tn) {
+
+ the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+ ret_val =
+ yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+ inode_chunk);
+
+ /* Delete the entry in the filestructure (if found) */
+ if (ret_val != -1)
+ yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
+ }
+
+ return ret_val;
+}
+
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+ int nand_chunk, int in_scan)
+{
+ /* NB in_scan is zero unless scanning.
+ * For forward scanning, in_scan is > 0;
+ * for backward scanning in_scan is < 0
+ *
+ * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
+ */
+
+ struct yaffs_tnode *tn;
+ struct yaffs_dev *dev = in->my_dev;
+ int existing_cunk;
+ struct yaffs_ext_tags existing_tags;
+ struct yaffs_ext_tags new_tags;
+ unsigned existing_serial, new_serial;
+
+ if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
+ /* Just ignore an attempt at putting a chunk into a non-file during scanning
+ * If it is not during Scanning then something went wrong!
+ */
+ if (!in_scan) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("yaffs tragedy:attempt to put data chunk into a non-file"
+ TENDSTR)));
+ YBUG();
+ }
+
+ yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+ return YAFFS_OK;
+ }
+
+ tn = yaffs_add_find_tnode_0(dev,
+ &in->variant.file_variant,
+ inode_chunk, NULL);
+ if (!tn)
+ return YAFFS_FAIL;
+
+ if (!nand_chunk)
+ /* Dummy insert, bail now */
+ return YAFFS_OK;
+
+ existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+ if (in_scan != 0) {
+ /* If we're scanning then we need to test for duplicates
+ * NB This does not need to be efficient since it should only ever
+ * happen when the power fails during a write, then only one
+ * chunk should ever be affected.
+ *
+ * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
+ * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
+ */
+
+ if (existing_cunk > 0) {
+ /* NB Right now existing chunk will not be real chunk_id if the chunk group size > 1
+ * thus we have to do a FindChunkInFile to get the real chunk id.
+ *
+ * We have a duplicate now we need to decide which one to use:
+ *
+ * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
+ * Forward scanning YAFFS2: The new one is what we use, dump the old one.
+ * YAFFS1: Get both sets of tags and compare serial numbers.
+ */
+
+ if (in_scan > 0) {
+ /* Only do this for forward scanning */
+ yaffs_rd_chunk_tags_nand(dev,
+ nand_chunk,
+ NULL, &new_tags);
+
+ /* Do a proper find */
+ existing_cunk =
+ yaffs_find_chunk_in_file(in, inode_chunk,
+ &existing_tags);
+ }
+
+ if (existing_cunk <= 0) {
+ /*Hoosterman - how did this happen? */
+
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("yaffs tragedy: existing chunk < 0 in scan"
+ TENDSTR)));
+
+ }
+
+ /* NB The deleted flags should be false, otherwise the chunks will
+ * not be loaded during a scan
+ */
+
+ if (in_scan > 0) {
+ new_serial = new_tags.serial_number;
+ existing_serial = existing_tags.serial_number;
+ }
+
+ if ((in_scan > 0) &&
+ (existing_cunk <= 0 ||
+ ((existing_serial + 1) & 3) == new_serial)) {
+ /* Forward scanning.
+ * Use new
+ * Delete the old one and drop through to update the tnode
+ */
+ yaffs_chunk_del(dev, existing_cunk, 1,
+ __LINE__);
+ } else {
+ /* Backward scanning or we want to use the existing one
+ * Use existing.
+ * Delete the new one and return early so that the tnode isn't changed
+ */
+ yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+ return YAFFS_OK;
+ }
+ }
+
+ }
+
+ if (existing_cunk == 0)
+ in->n_data_chunks++;
+
+ yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
+
+ return YAFFS_OK;
+}
+
+static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
+{
+ int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
+
+ if (nand_chunk >= 0)
+ return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
+ buffer, NULL);
+ else {
+ T(YAFFS_TRACE_NANDACCESS,
+ (TSTR("Chunk %d not found zero instead" TENDSTR),
+ nand_chunk));
+ /* get sane (zero) data if you read a hole */
+ memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
+ return 0;
+ }
+
+}
+
+void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
+ int lyn)
+{
+ int block;
+ int page;
+ struct yaffs_ext_tags tags;
+ struct yaffs_block_info *bi;
+
+ if (chunk_id <= 0)
+ return;
+
+ dev->n_deletions++;
+ block = chunk_id / dev->param.chunks_per_block;
+ page = chunk_id % dev->param.chunks_per_block;
+
+ if (!yaffs_check_chunk_bit(dev, block, page))
+ T(YAFFS_TRACE_VERIFY,
+ (TSTR("Deleting invalid chunk %d" TENDSTR), chunk_id));
+
+ bi = yaffs_get_block_info(dev, block);
+
+ yaffs2_update_oldest_dirty_seq(dev, block, bi);
+
+ T(YAFFS_TRACE_DELETION,
+ (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunk_id));
+
+ if (!dev->param.is_yaffs2 && mark_flash &&
+ bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
+
+ yaffs_init_tags(&tags);
+
+ tags.is_deleted = 1;
+
+ yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
+ yaffs_handle_chunk_update(dev, chunk_id, &tags);
+ } else {
+ dev->n_unmarked_deletions++;
+ }
+
+ /* Pull out of the management area.
+ * If the whole block became dirty, this will kick off an erasure.
+ */
+ if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
+ bi->block_state == YAFFS_BLOCK_STATE_FULL ||
+ bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+ bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+ dev->n_free_chunks++;
+
+ yaffs_clear_chunk_bit(dev, block, page);
+
+ bi->pages_in_use--;
+
+ if (bi->pages_in_use == 0 &&
+ !bi->has_shrink_hdr &&
+ bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
+ bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+ yaffs_block_became_dirty(dev, block);
+ }
+
+ }
+
+}
+
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+ const u8 * buffer, int n_bytes, int use_reserve)
+{
+ /* Find old chunk Need to do this to get serial number
+ * Write new one and patch into tree.
+ * Invalidate old tags.
+ */
+
+ int prev_chunk_id;
+ struct yaffs_ext_tags prev_tags;
+
+ int new_chunk_id;
+ struct yaffs_ext_tags new_tags;
+
+ struct yaffs_dev *dev = in->my_dev;
+
+ yaffs_check_gc(dev, 0);
+
+ /* Get the previous chunk at this location in the file if it exists.
+ * If it does not exist then put a zero into the tree. This creates
+ * the tnode now, rather than later when it is harder to clean up.
+ */
+ prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
+ if (prev_chunk_id < 1 &&
+ !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
+ return 0;
+
+ /* Set up new tags */
+ yaffs_init_tags(&new_tags);
+
+ new_tags.chunk_id = inode_chunk;
+ new_tags.obj_id = in->obj_id;
+ new_tags.serial_number =
+ (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
+ new_tags.n_bytes = n_bytes;
+
+ if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR),
+ n_bytes));
+ YBUG();
+ }
+
+ new_chunk_id =
+ yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
+
+ if (new_chunk_id > 0) {
+ yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
+
+ if (prev_chunk_id > 0)
+ yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
+
+ yaffs_verify_file_sane(in);
+ }
+ return new_chunk_id;
+
+}
+
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
+ */
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR * name, int force,
+ int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
+{
+
+ struct yaffs_block_info *bi;
+
+ struct yaffs_dev *dev = in->my_dev;
+
+ int prev_chunk_id;
+ int ret_val = 0;
+ int result = 0;
+
+ int new_chunk_id;
+ struct yaffs_ext_tags new_tags;
+ struct yaffs_ext_tags old_tags;
+ const YCHAR *alias = NULL;
+
+ u8 *buffer = NULL;
+ YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
+
+ struct yaffs_obj_hdr *oh = NULL;
+
+ yaffs_strcpy(old_name, _Y("silly old name"));
+
+ if (!in->fake || in == dev->root_dir || /* The root_dir should also be saved */
+ force || xmod) {
+
+ yaffs_check_gc(dev, 0);
+ yaffs_check_obj_details_loaded(in);
+
+ buffer = yaffs_get_temp_buffer(in->my_dev, __LINE__);
+ oh = (struct yaffs_obj_hdr *)buffer;
+
+ prev_chunk_id = in->hdr_chunk;
+
+ if (prev_chunk_id > 0) {
+ result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
+ buffer, &old_tags);
+
+ yaffs_verify_oh(in, oh, &old_tags, 0);
+
+ memcpy(old_name, oh->name, sizeof(oh->name));
+ memset(buffer, 0xFF, sizeof(struct yaffs_obj_hdr));
+ } else {
+ memset(buffer, 0xFF, dev->data_bytes_per_chunk);
+ }
+
+ oh->type = in->variant_type;
+ oh->yst_mode = in->yst_mode;
+ oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
+
+ yaffs_load_attribs_oh(oh, in);
+
+ if (in->parent)
+ oh->parent_obj_id = in->parent->obj_id;
+ else
+ oh->parent_obj_id = 0;
+
+ if (name && *name) {
+ memset(oh->name, 0, sizeof(oh->name));
+ yaffs_load_oh_from_name(dev, oh->name, name);
+ } else if (prev_chunk_id > 0) {
+ memcpy(oh->name, old_name, sizeof(oh->name));
+ } else {
+ memset(oh->name, 0, sizeof(oh->name));
+ }
+
+ oh->is_shrink = is_shrink;
+
+ switch (in->variant_type) {
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* Should not happen */
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ oh->file_size =
+ (oh->parent_obj_id == YAFFS_OBJECTID_DELETED
+ || oh->parent_obj_id ==
+ YAFFS_OBJECTID_UNLINKED) ? 0 : in->
+ variant.file_variant.file_size;
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ oh->equiv_id = in->variant.hardlink_variant.equiv_id;
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ /* Do nothing */
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ /* Do nothing */
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ alias = in->variant.symlink_variant.alias;
+ if (!alias)
+ alias = _Y("no alias");
+ yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
+ oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+ break;
+ }
+
+ /* process any xattrib modifications */
+ if (xmod)
+ yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
+
+ /* Tags */
+ yaffs_init_tags(&new_tags);
+ in->serial++;
+ new_tags.chunk_id = 0;
+ new_tags.obj_id = in->obj_id;
+ new_tags.serial_number = in->serial;
+
+ /* Add extra info for file header */
+
+ new_tags.extra_available = 1;
+ new_tags.extra_parent_id = oh->parent_obj_id;
+ new_tags.extra_length = oh->file_size;
+ new_tags.extra_is_shrink = oh->is_shrink;
+ new_tags.extra_equiv_id = oh->equiv_id;
+ new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
+ new_tags.extra_obj_type = in->variant_type;
+
+ yaffs_verify_oh(in, oh, &new_tags, 1);
+
+ /* Create new chunk in NAND */
+ new_chunk_id =
+ yaffs_write_new_chunk(dev, buffer, &new_tags,
+ (prev_chunk_id > 0) ? 1 : 0);
+
+ if (new_chunk_id >= 0) {
+
+ in->hdr_chunk = new_chunk_id;
+
+ if (prev_chunk_id > 0) {
+ yaffs_chunk_del(dev, prev_chunk_id, 1,
+ __LINE__);
+ }
+
+ if (!yaffs_obj_cache_dirty(in))
+ in->dirty = 0;
+
+ /* If this was a shrink, then mark the block that the chunk lives on */
+ if (is_shrink) {
+ bi = yaffs_get_block_info(in->my_dev,
+ new_chunk_id /
+ in->my_dev->param.
+ chunks_per_block);
+ bi->has_shrink_hdr = 1;
+ }
+
+ }
+
+ ret_val = new_chunk_id;
+
+ }
+
+ if (buffer)
+ yaffs_release_temp_buffer(dev, buffer, __LINE__);
+
+ return ret_val;
+}
+
+/*------------------------ Short Operations Cache ----------------------------------------
+ * In many situations where there is no high level buffering a lot of
+ * reads might be short sequential reads, and a lot of writes may be short
+ * sequential writes. eg. scanning/writing a jpeg file.
+ * In these cases, a short read/write cache can provide a huge perfomance
+ * benefit with dumb-as-a-rock code.
+ * In Linux, the page cache provides read buffering and the short op cache
+ * provides write buffering.
+ *
+ * There are a limited number (~10) of cache chunks per device so that we don't
+ * need a very intelligent search.
+ */
+
+static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
+{
+ struct yaffs_dev *dev = obj->my_dev;
+ int i;
+ struct yaffs_cache *cache;
+ int n_caches = obj->my_dev->param.n_caches;
+
+ for (i = 0; i < n_caches; i++) {
+ cache = &dev->cache[i];
+ if (cache->object == obj && cache->dirty)
+ return 1;
+ }
+
+ return 0;
+}
+
+static void yaffs_flush_file_cache(struct yaffs_obj *obj)
+{
+ struct yaffs_dev *dev = obj->my_dev;
+ int lowest = -99; /* Stop compiler whining. */
+ int i;
+ struct yaffs_cache *cache;
+ int chunk_written = 0;
+ int n_caches = obj->my_dev->param.n_caches;
+
+ if (n_caches > 0) {
+ do {
+ cache = NULL;
+
+ /* Find the dirty cache for this object with the lowest chunk id. */
+ for (i = 0; i < n_caches; i++) {
+ if (dev->cache[i].object == obj &&
+ dev->cache[i].dirty) {
+ if (!cache
+ || dev->cache[i].chunk_id <
+ lowest) {
+ cache = &dev->cache[i];
+ lowest = cache->chunk_id;
+ }
+ }
+ }
+
+ if (cache && !cache->locked) {
+ /* Write it out and free it up */
+
+ chunk_written =
+ yaffs_wr_data_obj(cache->object,
+ cache->chunk_id,
+ cache->data,
+ cache->n_bytes, 1);
+ cache->dirty = 0;
+ cache->object = NULL;
+ }
+
+ } while (cache && chunk_written > 0);
+
+ if (cache) {
+ /* Hoosterman, disk full while writing cache out. */
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("yaffs tragedy: no space during cache write"
+ TENDSTR)));
+
+ }
+ }
+
+}
+
+/*yaffs_flush_whole_cache(dev)
+ *
+ *
+ */
+
+void yaffs_flush_whole_cache(struct yaffs_dev *dev)
+{
+ struct yaffs_obj *obj;
+ int n_caches = dev->param.n_caches;
+ int i;
+
+ /* Find a dirty object in the cache and flush it...
+ * until there are no further dirty objects.
+ */
+ do {
+ obj = NULL;
+ for (i = 0; i < n_caches && !obj; i++) {
+ if (dev->cache[i].object && dev->cache[i].dirty)
+ obj = dev->cache[i].object;
+
+ }
+ if (obj)
+ yaffs_flush_file_cache(obj);
+
+ } while (obj);
+
+}
+
+/* Grab us a cache chunk for use.
+ * First look for an empty one.
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
+{
+ int i;
+
+ if (dev->param.n_caches > 0) {
+ for (i = 0; i < dev->param.n_caches; i++) {
+ if (!dev->cache[i].object)
+ return &dev->cache[i];
+ }
+ }
+
+ return NULL;
+}
+
+static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
+{
+ struct yaffs_cache *cache;
+ struct yaffs_obj *the_obj;
+ int usage;
+ int i;
+ int pushout;
+
+ if (dev->param.n_caches > 0) {
+ /* Try find a non-dirty one... */
+
+ cache = yaffs_grab_chunk_worker(dev);
+
+ if (!cache) {
+ /* They were all dirty, find the last recently used object and flush
+ * its cache, then find again.
+ * NB what's here is not very accurate, we actually flush the object
+ * the last recently used page.
+ */
+
+ /* With locking we can't assume we can use entry zero */
+
+ the_obj = NULL;
+ usage = -1;
+ cache = NULL;
+ pushout = -1;
+
+ for (i = 0; i < dev->param.n_caches; i++) {
+ if (dev->cache[i].object &&
+ !dev->cache[i].locked &&
+ (dev->cache[i].last_use < usage
+ || !cache)) {
+ usage = dev->cache[i].last_use;
+ the_obj = dev->cache[i].object;
+ cache = &dev->cache[i];
+ pushout = i;
+ }
+ }
+
+ if (!cache || cache->dirty) {
+ /* Flush and try again */
+ yaffs_flush_file_cache(the_obj);
+ cache = yaffs_grab_chunk_worker(dev);
+ }
+
+ }
+ return cache;
+ } else {
+ return NULL;
+ }
+}
+
+/* Find a cached chunk */
+static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
+ int chunk_id)
+{
+ struct yaffs_dev *dev = obj->my_dev;
+ int i;
+ if (dev->param.n_caches > 0) {
+ for (i = 0; i < dev->param.n_caches; i++) {
+ if (dev->cache[i].object == obj &&
+ dev->cache[i].chunk_id == chunk_id) {
+ dev->cache_hits++;
+
+ return &dev->cache[i];
+ }
+ }
+ }
+ return NULL;
+}
+
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
+ int is_write)
+{
+
+ if (dev->param.n_caches > 0) {
+ if (dev->cache_last_use < 0 || dev->cache_last_use > 100000000) {
+ /* Reset the cache usages */
+ int i;
+ for (i = 1; i < dev->param.n_caches; i++)
+ dev->cache[i].last_use = 0;
+
+ dev->cache_last_use = 0;
+ }
+
+ dev->cache_last_use++;
+
+ cache->last_use = dev->cache_last_use;
+
+ if (is_write)
+ cache->dirty = 1;
+ }
+}
+
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
+{
+ if (object->my_dev->param.n_caches > 0) {
+ struct yaffs_cache *cache =
+ yaffs_find_chunk_cache(object, chunk_id);
+
+ if (cache)
+ cache->object = NULL;
+ }
+}
+
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
+{
+ int i;
+ struct yaffs_dev *dev = in->my_dev;
+
+ if (dev->param.n_caches > 0) {
+ /* Invalidate it. */
+ for (i = 0; i < dev->param.n_caches; i++) {
+ if (dev->cache[i].object == in)
+ dev->cache[i].object = NULL;
+ }
+ }
+}
+
+/*--------------------- File read/write ------------------------
+ * Read and write have very similar structures.
+ * In general the read/write has three parts to it
+ * An incomplete chunk to start with (if the read/write is not chunk-aligned)
+ * Some complete chunks
+ * An incomplete chunk to end off with
+ *
+ * Curve-balls: the first chunk might also be the last chunk.
+ */
+
+int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
+{
+
+ int chunk;
+ u32 start;
+ int n_copy;
+ int n = n_bytes;
+ int n_done = 0;
+ struct yaffs_cache *cache;
+
+ struct yaffs_dev *dev;
+
+ dev = in->my_dev;
+
+ while (n > 0) {
+ /* chunk = offset / dev->data_bytes_per_chunk + 1; */
+ /* start = offset % dev->data_bytes_per_chunk; */
+ yaffs_addr_to_chunk(dev, offset, &chunk, &start);
+ chunk++;
+
+ /* OK now check for the curveball where the start and end are in
+ * the same chunk.
+ */
+ if ((start + n) < dev->data_bytes_per_chunk)
+ n_copy = n;
+ else
+ n_copy = dev->data_bytes_per_chunk - start;
+
+ cache = yaffs_find_chunk_cache(in, chunk);
+
+ /* If the chunk is already in the cache or it is less than a whole chunk
+ * or we're using inband tags then use the cache (if there is caching)
+ * else bypass the cache.
+ */
+ if (cache || n_copy != dev->data_bytes_per_chunk
+ || dev->param.inband_tags) {
+ if (dev->param.n_caches > 0) {
+
+ /* If we can't find the data in the cache, then load it up. */
+
+ if (!cache) {
+ cache =
+ yaffs_grab_chunk_cache(in->my_dev);
+ cache->object = in;
+ cache->chunk_id = chunk;
+ cache->dirty = 0;
+ cache->locked = 0;
+ yaffs_rd_data_obj(in, chunk,
+ cache->data);
+ cache->n_bytes = 0;
+ }
+
+ yaffs_use_cache(dev, cache, 0);
+
+ cache->locked = 1;
+
+ memcpy(buffer, &cache->data[start], n_copy);
+
+ cache->locked = 0;
+ } else {
+ /* Read into the local buffer then copy.. */
+
+ u8 *local_buffer =
+ yaffs_get_temp_buffer(dev, __LINE__);
+ yaffs_rd_data_obj(in, chunk, local_buffer);
+
+ memcpy(buffer, &local_buffer[start], n_copy);
+
+ yaffs_release_temp_buffer(dev, local_buffer,
+ __LINE__);
+ }
+
+ } else {
+
+ /* A full chunk. Read directly into the supplied buffer. */
+ yaffs_rd_data_obj(in, chunk, buffer);
+
+ }
+
+ n -= n_copy;
+ offset += n_copy;
+ buffer += n_copy;
+ n_done += n_copy;
+
+ }
+
+ return n_done;
+}
+
+int yaffs_do_file_wr(struct yaffs_obj *in, const u8 * buffer, loff_t offset,
+ int n_bytes, int write_trhrough)
+{
+
+ int chunk;
+ u32 start;
+ int n_copy;
+ int n = n_bytes;
+ int n_done = 0;
+ int n_writeback;
+ int start_write = offset;
+ int chunk_written = 0;
+ u32 n_bytes_read;
+ u32 chunk_start;
+
+ struct yaffs_dev *dev;
+
+ dev = in->my_dev;
+
+ while (n > 0 && chunk_written >= 0) {
+ yaffs_addr_to_chunk(dev, offset, &chunk, &start);
+
+ if (chunk * dev->data_bytes_per_chunk + start != offset ||
+ start >= dev->data_bytes_per_chunk) {
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("AddrToChunk of offset %d gives chunk %d start %d"
+ TENDSTR), (int)offset, chunk, start));
+ }
+ chunk++; /* File pos to chunk in file offset */
+
+ /* OK now check for the curveball where the start and end are in
+ * the same chunk.
+ */
+
+ if ((start + n) < dev->data_bytes_per_chunk) {
+ n_copy = n;
+
+ /* Now folks, to calculate how many bytes to write back....
+ * If we're overwriting and not writing to then end of file then
+ * we need to write back as much as was there before.
+ */
+
+ chunk_start = ((chunk - 1) * dev->data_bytes_per_chunk);
+
+ if (chunk_start > in->variant.file_variant.file_size)
+ n_bytes_read = 0; /* Past end of file */
+ else
+ n_bytes_read =
+ in->variant.file_variant.file_size -
+ chunk_start;
+
+ if (n_bytes_read > dev->data_bytes_per_chunk)
+ n_bytes_read = dev->data_bytes_per_chunk;
+
+ n_writeback =
+ (n_bytes_read >
+ (start + n)) ? n_bytes_read : (start + n);
+
+ if (n_writeback < 0
+ || n_writeback > dev->data_bytes_per_chunk)
+ YBUG();
+
+ } else {
+ n_copy = dev->data_bytes_per_chunk - start;
+ n_writeback = dev->data_bytes_per_chunk;
+ }
+
+ if (n_copy != dev->data_bytes_per_chunk
+ || dev->param.inband_tags) {
+ /* An incomplete start or end chunk (or maybe both start and end chunk),
+ * or we're using inband tags, so we want to use the cache buffers.
+ */
+ if (dev->param.n_caches > 0) {
+ struct yaffs_cache *cache;
+ /* If we can't find the data in the cache, then load the cache */
+ cache = yaffs_find_chunk_cache(in, chunk);
+
+ if (!cache
+ && yaffs_check_alloc_available(dev, 1)) {
+ cache = yaffs_grab_chunk_cache(dev);
+ cache->object = in;
+ cache->chunk_id = chunk;
+ cache->dirty = 0;
+ cache->locked = 0;
+ yaffs_rd_data_obj(in, chunk,
+ cache->data);
+ } else if (cache &&
+ !cache->dirty &&
+ !yaffs_check_alloc_available(dev,
+ 1)) {
+ /* Drop the cache if it was a read cache item and
+ * no space check has been made for it.
+ */
+ cache = NULL;
+ }
+
+ if (cache) {
+ yaffs_use_cache(dev, cache, 1);
+ cache->locked = 1;
+
+ memcpy(&cache->data[start], buffer,
+ n_copy);
+
+ cache->locked = 0;
+ cache->n_bytes = n_writeback;
+
+ if (write_trhrough) {
+ chunk_written =
+ yaffs_wr_data_obj
+ (cache->object,
+ cache->chunk_id,
+ cache->data,
+ cache->n_bytes, 1);
+ cache->dirty = 0;
+ }
+
+ } else {
+ chunk_written = -1; /* fail the write */
+ }
+ } else {
+ /* An incomplete start or end chunk (or maybe both start and end chunk)
+ * Read into the local buffer then copy, then copy over and write back.
+ */
+
+ u8 *local_buffer =
+ yaffs_get_temp_buffer(dev, __LINE__);
+
+ yaffs_rd_data_obj(in, chunk, local_buffer);
+
+ memcpy(&local_buffer[start], buffer, n_copy);
+
+ chunk_written =
+ yaffs_wr_data_obj(in, chunk,
+ local_buffer,
+ n_writeback, 0);
+
+ yaffs_release_temp_buffer(dev, local_buffer,
+ __LINE__);
+
+ }
+
+ } else {
+ /* A full chunk. Write directly from the supplied buffer. */
+
+ chunk_written =
+ yaffs_wr_data_obj(in, chunk, buffer,
+ dev->data_bytes_per_chunk, 0);
+
+ /* Since we've overwritten the cached data, we better invalidate it. */
+ yaffs_invalidate_chunk_cache(in, chunk);
+ }
+
+ if (chunk_written >= 0) {
+ n -= n_copy;
+ offset += n_copy;
+ buffer += n_copy;
+ n_done += n_copy;
+ }
+
+ }
+
+ /* Update file object */
+
+ if ((start_write + n_done) > in->variant.file_variant.file_size)
+ in->variant.file_variant.file_size = (start_write + n_done);
+
+ in->dirty = 1;
+
+ return n_done;
+}
+
+int yaffs_wr_file(struct yaffs_obj *in, const u8 * buffer, loff_t offset,
+ int n_bytes, int write_trhrough)
+{
+ yaffs2_handle_hole(in, offset);
+ return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_trhrough);
+}
+
+/* ---------------------- File resizing stuff ------------------ */
+
+static void yaffs_prune_chunks(struct yaffs_obj *in, int new_size)
+{
+
+ struct yaffs_dev *dev = in->my_dev;
+ int old_size = in->variant.file_variant.file_size;
+
+ int last_del = 1 + (old_size - 1) / dev->data_bytes_per_chunk;
+
+ int start_del = 1 + (new_size + dev->data_bytes_per_chunk - 1) /
+ dev->data_bytes_per_chunk;
+ int i;
+ int chunk_id;
+
+ /* Delete backwards so that we don't end up with holes if
+ * power is lost part-way through the operation.
+ */
+ for (i = last_del; i >= start_del; i--) {
+ /* NB this could be optimised somewhat,
+ * eg. could retrieve the tags and write them without
+ * using yaffs_chunk_del
+ */
+
+ chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
+ if (chunk_id > 0) {
+ if (chunk_id <
+ (dev->internal_start_block *
+ dev->param.chunks_per_block)
+ || chunk_id >=
+ ((dev->internal_end_block +
+ 1) * dev->param.chunks_per_block)) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("Found daft chunk_id %d for %d" TENDSTR),
+ chunk_id, i));
+ } else {
+ in->n_data_chunks--;
+ yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
+ }
+ }
+ }
+
+}
+
+void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
+{
+ int new_full;
+ u32 new_partial;
+ struct yaffs_dev *dev = obj->my_dev;
+
+ yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
+
+ yaffs_prune_chunks(obj, new_size);
+
+ if (new_partial != 0) {
+ int last_chunk = 1 + new_full;
+ u8 *local_buffer = yaffs_get_temp_buffer(dev, __LINE__);
+
+ /* Got to read and rewrite the last chunk with its new size and zero pad */
+ yaffs_rd_data_obj(obj, last_chunk, local_buffer);
+ memset(local_buffer + new_partial, 0,
+ dev->data_bytes_per_chunk - new_partial);
+
+ yaffs_wr_data_obj(obj, last_chunk, local_buffer,
+ new_partial, 1);
+
+ yaffs_release_temp_buffer(dev, local_buffer, __LINE__);
+ }
+
+ obj->variant.file_variant.file_size = new_size;
+
+ yaffs_prune_tree(dev, &obj->variant.file_variant);
+}
+
+int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
+{
+ struct yaffs_dev *dev = in->my_dev;
+ int old_size = in->variant.file_variant.file_size;
+
+ yaffs_flush_file_cache(in);
+ yaffs_invalidate_whole_cache(in);
+
+ yaffs_check_gc(dev, 0);
+
+ if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
+ return YAFFS_FAIL;
+
+ if (new_size == old_size)
+ return YAFFS_OK;
+
+ if (new_size > old_size) {
+ yaffs2_handle_hole(in, new_size);
+ in->variant.file_variant.file_size = new_size;
+ } else {
+ /* new_size < old_size */
+ yaffs_resize_file_down(in, new_size);
+ }
+
+ /* Write a new object header to reflect the resize.
+ * show we've shrunk the file, if need be
+ * Do this only if the file is not in the deleted directories
+ * and is not shadowed.
+ */
+ if (in->parent &&
+ !in->is_shadowed &&
+ in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
+ in->parent->obj_id != YAFFS_OBJECTID_DELETED)
+ yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
+
+ return YAFFS_OK;
+}
+
+int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
+{
+ int ret_val;
+ if (in->dirty) {
+ yaffs_flush_file_cache(in);
+ if (data_sync) /* Only sync data */
+ ret_val = YAFFS_OK;
+ else {
+ if (update_time)
+ yaffs_load_current_time(in, 0, 0);
+
+ ret_val = (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >=
+ 0) ? YAFFS_OK : YAFFS_FAIL;
+ }
+ } else {
+ ret_val = YAFFS_OK;
+ }
+
+ return ret_val;
+
+}
+
+static int yaffs_generic_obj_del(struct yaffs_obj *in)
+{
+
+ /* First off, invalidate the file's data in the cache, without flushing. */
+ yaffs_invalidate_whole_cache(in);
+
+ if (in->my_dev->param.is_yaffs2 && (in->parent != in->my_dev->del_dir)) {
+ /* Move to the unlinked directory so we have a record that it was deleted. */
+ yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
+ 0);
+
+ }
+
+ yaffs_remove_obj_from_dir(in);
+ yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
+ in->hdr_chunk = 0;
+
+ yaffs_free_obj(in);
+ return YAFFS_OK;
+
+}
+
+/* yaffs_del_file deletes the whole file data
+ * and the inode associated with the file.
+ * It does not delete the links associated with the file.
+ */
+static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
+{
+
+ int ret_val;
+ int del_now = 0;
+ struct yaffs_dev *dev = in->my_dev;
+
+ if (!in->my_inode)
+ del_now = 1;
+
+ if (del_now) {
+ ret_val =
+ yaffs_change_obj_name(in, in->my_dev->del_dir,
+ _Y("deleted"), 0, 0);
+ T(YAFFS_TRACE_TRACING,
+ (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
+ in->obj_id));
+ in->deleted = 1;
+ in->my_dev->n_deleted_files++;
+ if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+ yaffs_resize_file(in, 0);
+ yaffs_soft_del_file(in);
+ } else {
+ ret_val =
+ yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
+ _Y("unlinked"), 0, 0);
+ }
+
+ return ret_val;
+}
+
+int yaffs_del_file(struct yaffs_obj *in)
+{
+ int ret_val = YAFFS_OK;
+ int deleted; /* Need to cache value on stack if in is freed */
+ struct yaffs_dev *dev = in->my_dev;
+
+ if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+ yaffs_resize_file(in, 0);
+
+ if (in->n_data_chunks > 0) {
+ /* Use soft deletion if there is data in the file.
+ * That won't be the case if it has been resized to zero.
+ */
+ if (!in->unlinked)
+ ret_val = yaffs_unlink_file_if_needed(in);
+
+ deleted = in->deleted;
+
+ if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
+ in->deleted = 1;
+ deleted = 1;
+ in->my_dev->n_deleted_files++;
+ yaffs_soft_del_file(in);
+ }
+ return deleted ? YAFFS_OK : YAFFS_FAIL;
+ } else {
+ /* The file has no data chunks so we toss it immediately */
+ yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
+ in->variant.file_variant.top = NULL;
+ yaffs_generic_obj_del(in);
+
+ return YAFFS_OK;
+ }
+}
+
+int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
+{
+ return (obj &&
+ obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
+ !(list_empty(&obj->variant.dir_variant.children));
+}
+
+static int yaffs_del_dir(struct yaffs_obj *obj)
+{
+ /* First check that the directory is empty. */
+ if (yaffs_is_non_empty_dir(obj))
+ return YAFFS_FAIL;
+
+ return yaffs_generic_obj_del(obj);
+}
+
+static int yaffs_del_symlink(struct yaffs_obj *in)
+{
+ if (in->variant.symlink_variant.alias)
+ YFREE(in->variant.symlink_variant.alias);
+ in->variant.symlink_variant.alias = NULL;
+
+ return yaffs_generic_obj_del(in);
+}
+
+static int yaffs_del_link(struct yaffs_obj *in)
+{
+ /* remove this hardlink from the list assocaited with the equivalent
+ * object
+ */
+ list_del_init(&in->hard_links);
+ return yaffs_generic_obj_del(in);
+}
+
+int yaffs_del_obj(struct yaffs_obj *obj)
+{
+ int ret_val = -1;
+ switch (obj->variant_type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ ret_val = yaffs_del_file(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ if (!list_empty(&obj->variant.dir_variant.dirty)) {
+ T(YAFFS_TRACE_BACKGROUND,
+ (TSTR
+ ("Remove object %d from dirty directories" TENDSTR),
+ obj->obj_id));
+ list_del_init(&obj->variant.dir_variant.dirty);
+ }
+ return yaffs_del_dir(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ ret_val = yaffs_del_symlink(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ ret_val = yaffs_del_link(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ ret_val = yaffs_generic_obj_del(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ ret_val = 0;
+ break; /* should not happen. */
+ }
+
+ return ret_val;
+}
+
+static int yaffs_unlink_worker(struct yaffs_obj *obj)
+{
+
+ int del_now = 0;
+
+ if (!obj->my_inode)
+ del_now = 1;
+
+ if (obj)
+ yaffs_update_parent(obj->parent);
+
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+ return yaffs_del_link(obj);
+ } else if (!list_empty(&obj->hard_links)) {
+ /* Curve ball: We're unlinking an object that has a hardlink.
+ *
+ * This problem arises because we are not strictly following
+ * The Linux link/inode model.
+ *
+ * We can't really delete the object.
+ * Instead, we do the following:
+ * - Select a hardlink.
+ * - Unhook it from the hard links
+ * - Move it from its parent directory (so that the rename can work)
+ * - Rename the object to the hardlink's name.
+ * - Delete the hardlink
+ */
+
+ struct yaffs_obj *hl;
+ struct yaffs_obj *parent;
+ int ret_val;
+ YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+ hl = list_entry(obj->hard_links.next, struct yaffs_obj,
+ hard_links);
+
+ yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+ parent = hl->parent;
+
+ list_del_init(&hl->hard_links);
+
+ yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
+
+ ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
+
+ if (ret_val == YAFFS_OK)
+ ret_val = yaffs_generic_obj_del(hl);
+
+ return ret_val;
+
+ } else if (del_now) {
+ switch (obj->variant_type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ return yaffs_del_file(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ list_del_init(&obj->variant.dir_variant.dirty);
+ return yaffs_del_dir(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ return yaffs_del_symlink(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ return yaffs_generic_obj_del(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ default:
+ return YAFFS_FAIL;
+ }
+ } else if (yaffs_is_non_empty_dir(obj)) {
+ return YAFFS_FAIL;
+ } else {
+ return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
+ _Y("unlinked"), 0, 0);
+ }
+}
+
+static int yaffs_unlink_obj(struct yaffs_obj *obj)
+{
+
+ if (obj && obj->unlink_allowed)
+ return yaffs_unlink_worker(obj);
+
+ return YAFFS_FAIL;
+
+}
+
+int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name)
+{
+ struct yaffs_obj *obj;
+
+ obj = yaffs_find_by_name(dir, name);
+ return yaffs_unlink_obj(obj);
+}
+
+/*----------------------- Initialisation Scanning ---------------------- */
+
+void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
+ int backward_scanning)
+{
+ struct yaffs_obj *obj;
+
+ if (!backward_scanning) {
+ /* Handle YAFFS1 forward scanning case
+ * For YAFFS1 we always do the deletion
+ */
+
+ } else {
+ /* Handle YAFFS2 case (backward scanning)
+ * If the shadowed object exists then ignore.
+ */
+ obj = yaffs_find_by_number(dev, obj_id);
+ if (obj)
+ return;
+ }
+
+ /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
+ * We put it in unlinked dir to be cleaned up after the scanning
+ */
+ obj =
+ yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
+ if (!obj)
+ return;
+ obj->is_shadowed = 1;
+ yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
+ obj->variant.file_variant.shrink_size = 0;
+ obj->valid = 1; /* So that we don't read any other info for this file */
+
+}
+
+void yaffs_link_fixup(struct yaffs_dev *dev, struct yaffs_obj *hard_list)
+{
+ struct yaffs_obj *hl;
+ struct yaffs_obj *in;
+
+ while (hard_list) {
+ hl = hard_list;
+ hard_list = (struct yaffs_obj *)(hard_list->hard_links.next);
+
+ in = yaffs_find_by_number(dev,
+ hl->variant.
+ hardlink_variant.equiv_id);
+
+ if (in) {
+ /* Add the hardlink pointers */
+ hl->variant.hardlink_variant.equiv_obj = in;
+ list_add(&hl->hard_links, &in->hard_links);
+ } else {
+ /* Todo Need to report/handle this better.
+ * Got a problem... hardlink to a non-existant object
+ */
+ hl->variant.hardlink_variant.equiv_obj = NULL;
+ INIT_LIST_HEAD(&hl->hard_links);
+
+ }
+ }
+}
+
+static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
+{
+ /*
+ * Sort out state of unlinked and deleted objects after scanning.
+ */
+ struct list_head *i;
+ struct list_head *n;
+ struct yaffs_obj *l;
+
+ if (dev->read_only)
+ return;
+
+ /* Soft delete all the unlinked files */
+ list_for_each_safe(i, n,
+ &dev->unlinked_dir->variant.dir_variant.children) {
+ if (i) {
+ l = list_entry(i, struct yaffs_obj, siblings);
+ yaffs_del_obj(l);
+ }
+ }
+
+ list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
+ if (i) {
+ l = list_entry(i, struct yaffs_obj, siblings);
+ yaffs_del_obj(l);
+ }
+ }
+
+}
+
+/*
+ * This code iterates through all the objects making sure that they are rooted.
+ * Any unrooted objects are re-rooted in lost+found.
+ * An object needs to be in one of:
+ * - Directly under deleted, unlinked
+ * - Directly or indirectly under root.
+ *
+ * Note:
+ * This code assumes that we don't ever change the current relationships between
+ * directories:
+ * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
+ * lost-n-found->parent == root_dir
+ *
+ * This fixes the problem where directories might have inadvertently been deleted
+ * leaving the object "hanging" without being rooted in the directory tree.
+ */
+
+static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
+{
+ return (obj == dev->del_dir ||
+ obj == dev->unlinked_dir || obj == dev->root_dir);
+}
+
+static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
+{
+ struct yaffs_obj *obj;
+ struct yaffs_obj *parent;
+ int i;
+ struct list_head *lh;
+ struct list_head *n;
+ int depth_limit;
+ int hanging;
+
+ if (dev->read_only)
+ return;
+
+ /* Iterate through the objects in each hash entry,
+ * looking at each object.
+ * Make sure it is rooted.
+ */
+
+ for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+ list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
+ if (lh) {
+ obj =
+ list_entry(lh, struct yaffs_obj, hash_link);
+ parent = obj->parent;
+
+ if (yaffs_has_null_parent(dev, obj)) {
+ /* These directories are not hanging */
+ hanging = 0;
+ } else if (!parent
+ || parent->variant_type !=
+ YAFFS_OBJECT_TYPE_DIRECTORY) {
+ hanging = 1;
+ } else if (yaffs_has_null_parent(dev, parent)) {
+ hanging = 0;
+ } else {
+ /*
+ * Need to follow the parent chain to see if it is hanging.
+ */
+ hanging = 0;
+ depth_limit = 100;
+
+ while (parent != dev->root_dir &&
+ parent->parent &&
+ parent->parent->variant_type ==
+ YAFFS_OBJECT_TYPE_DIRECTORY
+ && depth_limit > 0) {
+ parent = parent->parent;
+ depth_limit--;
+ }
+ if (parent != dev->root_dir)
+ hanging = 1;
+ }
+ if (hanging) {
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ ("Hanging object %d moved to lost and found"
+ TENDSTR), obj->obj_id));
+ yaffs_add_obj_to_dir(dev->lost_n_found,
+ obj);
+ }
+ }
+ }
+ }
+}
+
+/*
+ * Delete directory contents for cleaning up lost and found.
+ */
+static void yaffs_del_dir_contents(struct yaffs_obj *dir)
+{
+ struct yaffs_obj *obj;
+ struct list_head *lh;
+ struct list_head *n;
+
+ if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+ YBUG();
+
+ list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
+ if (lh) {
+ obj = list_entry(lh, struct yaffs_obj, siblings);
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
+ yaffs_del_dir_contents(obj);
+
+ T(YAFFS_TRACE_SCAN,
+ (TSTR("Deleting lost_found object %d" TENDSTR),
+ obj->obj_id));
+
+ /* Need to use UnlinkObject since Delete would not handle
+ * hardlinked objects correctly.
+ */
+ yaffs_unlink_obj(obj);
+ }
+ }
+
+}
+
+static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
+{
+ yaffs_del_dir_contents(dev->lost_n_found);
+}
+
+static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
+{
+ u8 *chunk_data;
+ struct yaffs_obj_hdr *oh;
+ struct yaffs_dev *dev;
+ struct yaffs_ext_tags tags;
+ int result;
+ int alloc_failed = 0;
+
+ if (!in)
+ return;
+
+ dev = in->my_dev;
+
+ if (in->lazy_loaded && in->hdr_chunk > 0) {
+ in->lazy_loaded = 0;
+ chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
+
+ result =
+ yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, chunk_data,
+ &tags);
+ oh = (struct yaffs_obj_hdr *)chunk_data;
+
+ in->yst_mode = oh->yst_mode;
+ yaffs_load_attribs(in, oh);
+ yaffs_set_obj_name_from_oh(in, oh);
+
+ if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+ in->variant.symlink_variant.alias =
+ yaffs_clone_str(oh->alias);
+ if (!in->variant.symlink_variant.alias)
+ alloc_failed = 1; /* Not returned to caller */
+ }
+
+ yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
+ }
+}
+
+/*------------------------------ Directory Functions ----------------------------- */
+
+/*
+ *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
+ * link (ie. name) is created or deleted in the directory.
+ *
+ * ie.
+ * create dir/a : update dir's mtime/ctime
+ * rm dir/a: update dir's mtime/ctime
+ * modify dir/a: don't update dir's mtimme/ctime
+ *
+ * This can be handled immediately or defered. Defering helps reduce the number
+ * of updates when many files in a directory are changed within a brief period.
+ *
+ * If the directory updating is defered then yaffs_update_dirty_dirs must be
+ * called periodically.
+ */
+
+static void yaffs_update_parent(struct yaffs_obj *obj)
+{
+ struct yaffs_dev *dev;
+ if (!obj)
+ return;
+ dev = obj->my_dev;
+ obj->dirty = 1;
+ yaffs_load_current_time(obj, 0, 1);
+ if (dev->param.defered_dir_update) {
+ struct list_head *link = &obj->variant.dir_variant.dirty;
+
+ if (list_empty(link)) {
+ list_add(link, &dev->dirty_dirs);
+ T(YAFFS_TRACE_BACKGROUND,
+ (TSTR("Added object %d to dirty directories" TENDSTR),
+ obj->obj_id));
+ }
+
+ } else {
+ yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
+ }
+}
+
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
+{
+ struct list_head *link;
+ struct yaffs_obj *obj;
+ struct yaffs_dir_var *d_s;
+ union yaffs_obj_var *o_v;
+
+ T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
+
+ while (!list_empty(&dev->dirty_dirs)) {
+ link = dev->dirty_dirs.next;
+ list_del_init(link);
+
+ d_s = list_entry(link, struct yaffs_dir_var, dirty);
+ o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
+ obj = list_entry(o_v, struct yaffs_obj, variant);
+
+ T(YAFFS_TRACE_BACKGROUND,
+ (TSTR("Update directory %d" TENDSTR), obj->obj_id));
+
+ if (obj->dirty)
+ yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
+ }
+}
+
+static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
+{
+ struct yaffs_dev *dev = obj->my_dev;
+ struct yaffs_obj *parent;
+
+ yaffs_verify_obj_in_dir(obj);
+ parent = obj->parent;
+
+ yaffs_verify_dir(parent);
+
+ if (dev && dev->param.remove_obj_fn)
+ dev->param.remove_obj_fn(obj);
+
+ list_del_init(&obj->siblings);
+ obj->parent = NULL;
+
+ yaffs_verify_dir(parent);
+}
+
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
+{
+ if (!directory) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("tragedy: Trying to add an object to a null pointer directory"
+ TENDSTR)));
+ YBUG();
+ return;
+ }
+ if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("tragedy: Trying to add an object to a non-directory"
+ TENDSTR)));
+ YBUG();
+ }
+
+ if (obj->siblings.prev == NULL) {
+ /* Not initialised */
+ YBUG();
+ }
+
+ yaffs_verify_dir(directory);
+
+ yaffs_remove_obj_from_dir(obj);
+
+ /* Now add it */
+ list_add(&obj->siblings, &directory->variant.dir_variant.children);
+ obj->parent = directory;
+
+ if (directory == obj->my_dev->unlinked_dir
+ || directory == obj->my_dev->del_dir) {
+ obj->unlinked = 1;
+ obj->my_dev->n_unlinked_files++;
+ obj->rename_allowed = 0;
+ }
+
+ yaffs_verify_dir(directory);
+ yaffs_verify_obj_in_dir(obj);
+}
+
+struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
+ const YCHAR * name)
+{
+ int sum;
+
+ struct list_head *i;
+ YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
+
+ struct yaffs_obj *l;
+
+ if (!name)
+ return NULL;
+
+ if (!directory) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("tragedy: yaffs_find_by_name: null pointer directory"
+ TENDSTR)));
+ YBUG();
+ return NULL;
+ }
+ if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR("tragedy: yaffs_find_by_name: non-directory" TENDSTR)));
+ YBUG();
+ }
+
+ sum = yaffs_calc_name_sum(name);
+
+ list_for_each(i, &directory->variant.dir_variant.children) {
+ if (i) {
+ l = list_entry(i, struct yaffs_obj, siblings);
+
+ if (l->parent != directory)
+ YBUG();
+
+ yaffs_check_obj_details_loaded(l);
+
+ /* Special case for lost-n-found */
+ if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+ if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME))
+ return l;
+ } else if (yaffs_sum_cmp(l->sum, sum)
+ || l->hdr_chunk <= 0) {
+ /* LostnFound chunk called Objxxx
+ * Do a real check
+ */
+ yaffs_get_obj_name(l, buffer,
+ YAFFS_MAX_NAME_LENGTH + 1);
+ if (yaffs_strncmp
+ (name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
+ return l;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+/* GetEquivalentObject dereferences any hard links to get to the
+ * actual object.
+ */
+
+struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
+{
+ if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+ /* We want the object id of the equivalent object, not this one */
+ obj = obj->variant.hardlink_variant.equiv_obj;
+ yaffs_check_obj_details_loaded(obj);
+ }
+ return obj;
+}
+
+/*
+ * A note or two on object names.
+ * * If the object name is missing, we then make one up in the form objnnn
+ *
+ * * ASCII names are stored in the object header's name field from byte zero
+ * * Unicode names are historically stored starting from byte zero.
+ *
+ * Then there are automatic Unicode names...
+ * The purpose of these is to save names in a way that can be read as
+ * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
+ * system to share files.
+ *
+ * These automatic unicode are stored slightly differently...
+ * - If the name can fit in the ASCII character space then they are saved as
+ * ascii names as per above.
+ * - If the name needs Unicode then the name is saved in Unicode
+ * starting at oh->name[1].
+
+ */
+static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR * name,
+ int buffer_size)
+{
+ /* Create an object name if we could not find one. */
+ if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
+ YCHAR local_name[20];
+ YCHAR num_string[20];
+ YCHAR *x = &num_string[19];
+ unsigned v = obj->obj_id;
+ num_string[19] = 0;
+ while (v > 0) {
+ x--;
+ *x = '0' + (v % 10);
+ v /= 10;
+ }
+ /* make up a name */
+ yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
+ yaffs_strcat(local_name, x);
+ yaffs_strncpy(name, local_name, buffer_size - 1);
+ }
+}
+
+static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR * name,
+ const YCHAR * oh_name, int buff_size)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+ if (dev->param.auto_unicode) {
+ if (*oh_name) {
+ /* It is an ASCII name, so do an ASCII to unicode conversion */
+ const char *ascii_oh_name = (const char *)oh_name;
+ int n = buff_size - 1;
+ while (n > 0 && *ascii_oh_name) {
+ *name = *ascii_oh_name;
+ name++;
+ ascii_oh_name++;
+ n--;
+ }
+ } else {
+ yaffs_strncpy(name, oh_name + 1, buff_size - 1);
+ }
+ } else {
+#else
+ {
+#endif
+ yaffs_strncpy(name, oh_name, buff_size - 1);
+ }
+}
+
+static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR * oh_name,
+ const YCHAR * name)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+
+ int is_ascii;
+ YCHAR *w;
+
+ if (dev->param.auto_unicode) {
+
+ is_ascii = 1;
+ w = name;
+
+ /* Figure out if the name will fit in ascii character set */
+ while (is_ascii && *w) {
+ if ((*w) & 0xff00)
+ is_ascii = 0;
+ w++;
+ }
+
+ if (is_ascii) {
+ /* It is an ASCII name, so do a unicode to ascii conversion */
+ char *ascii_oh_name = (char *)oh_name;
+ int n = YAFFS_MAX_NAME_LENGTH - 1;
+ while (n > 0 && *name) {
+ *ascii_oh_name = *name;
+ name++;
+ ascii_oh_name++;
+ n--;
+ }
+ } else {
+ /* It is a unicode name, so save starting at the second YCHAR */
+ *oh_name = 0;
+ yaffs_strncpy(oh_name + 1, name,
+ YAFFS_MAX_NAME_LENGTH - 2);
+ }
+ } else {
+#else
+ {
+#endif
+ yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
+ }
+
+}
+
+int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size)
+{
+ memset(name, 0, buffer_size * sizeof(YCHAR));
+
+ yaffs_check_obj_details_loaded(obj);
+
+ if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+ yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
+ }
+#ifndef CONFIG_YAFFS_NO_SHORT_NAMES
+ else if (obj->short_name[0]) {
+ yaffs_strcpy(name, obj->short_name);
+ }
+#endif
+ else if (obj->hdr_chunk > 0) {
+ int result;
+ u8 *buffer = yaffs_get_temp_buffer(obj->my_dev, __LINE__);
+
+ struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
+
+ memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
+
+ if (obj->hdr_chunk > 0) {
+ result = yaffs_rd_chunk_tags_nand(obj->my_dev,
+ obj->hdr_chunk,
+ buffer, NULL);
+ }
+ yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
+ buffer_size);
+
+ yaffs_release_temp_buffer(obj->my_dev, buffer, __LINE__);
+ }
+
+ yaffs_fix_null_name(obj, name, buffer_size);
+
+ return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
+}
+
+int yaffs_get_obj_length(struct yaffs_obj *obj)
+{
+ /* Dereference any hard linking */
+ obj = yaffs_get_equivalent_obj(obj);
+
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+ return obj->variant.file_variant.file_size;
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+ if (!obj->variant.symlink_variant.alias)
+ return 0;
+ return yaffs_strnlen(obj->variant.symlink_variant.alias,
+ YAFFS_MAX_ALIAS_LENGTH);
+ } else {
+ /* Only a directory should drop through to here */
+ return obj->my_dev->data_bytes_per_chunk;
+ }
+}
+
+int yaffs_get_obj_link_count(struct yaffs_obj *obj)
+{
+ int count = 0;
+ struct list_head *i;
+
+ if (!obj->unlinked)
+ count++; /* the object itself */
+
+ list_for_each(i, &obj->hard_links)
+ count++; /* add the hard links; */
+
+ return count;
+}
+
+int yaffs_get_obj_inode(struct yaffs_obj *obj)
+{
+ obj = yaffs_get_equivalent_obj(obj);
+
+ return obj->obj_id;
+}
+
+unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
+{
+ obj = yaffs_get_equivalent_obj(obj);
+
+ switch (obj->variant_type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ return DT_REG;
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ return DT_DIR;
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ return DT_LNK;
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ return DT_REG;
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ if (S_ISFIFO(obj->yst_mode))
+ return DT_FIFO;
+ if (S_ISCHR(obj->yst_mode))
+ return DT_CHR;
+ if (S_ISBLK(obj->yst_mode))
+ return DT_BLK;
+ if (S_ISSOCK(obj->yst_mode))
+ return DT_SOCK;
+ default:
+ return DT_REG;
+ break;
+ }
+}
+
+YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
+{
+ obj = yaffs_get_equivalent_obj(obj);
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
+ return yaffs_clone_str(obj->variant.symlink_variant.alias);
+ else
+ return yaffs_clone_str(_Y(""));
+}
+
+static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
+ const YCHAR * name, const void *value, int size,
+ int flags)
+{
+ struct yaffs_xattr_mod xmod;
+
+ int result;
+
+ xmod.set = set;
+ xmod.name = name;
+ xmod.data = value;
+ xmod.size = size;
+ xmod.flags = flags;
+ xmod.result = -ENOSPC;
+
+ result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
+
+ if (result > 0)
+ return xmod.result;
+ else
+ return -ENOSPC;
+}
+
+static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
+ struct yaffs_xattr_mod *xmod)
+{
+ int retval = 0;
+ int x_offs = sizeof(struct yaffs_obj_hdr);
+ struct yaffs_dev *dev = obj->my_dev;
+ int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+
+ char *x_buffer = buffer + x_offs;
+
+ if (xmod->set)
+ retval =
+ nval_set(x_buffer, x_size, xmod->name, xmod->data,
+ xmod->size, xmod->flags);
+ else
+ retval = nval_del(x_buffer, x_size, xmod->name);
+
+ obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+ obj->xattr_known = 1;
+
+ xmod->result = retval;
+
+ return retval;
+}
+
+static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR * name,
+ void *value, int size)
+{
+ char *buffer = NULL;
+ int result;
+ struct yaffs_ext_tags tags;
+ struct yaffs_dev *dev = obj->my_dev;
+ int x_offs = sizeof(struct yaffs_obj_hdr);
+ int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+
+ char *x_buffer;
+
+ int retval = 0;
+
+ if (obj->hdr_chunk < 1)
+ return -ENODATA;
+
+ /* If we know that the object has no xattribs then don't do all the
+ * reading and parsing.
+ */
+ if (obj->xattr_known && !obj->has_xattr) {
+ if (name)
+ return -ENODATA;
+ else
+ return 0;
+ }
+
+ buffer = (char *)yaffs_get_temp_buffer(dev, __LINE__);
+ if (!buffer)
+ return -ENOMEM;
+
+ result =
+ yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
+
+ if (result != YAFFS_OK)
+ retval = -ENOENT;
+ else {
+ x_buffer = buffer + x_offs;
+
+ if (!obj->xattr_known) {
+ obj->has_xattr = nval_hasvalues(x_buffer, x_size);
+ obj->xattr_known = 1;
+ }
+
+ if (name)
+ retval = nval_get(x_buffer, x_size, name, value, size);
+ else
+ retval = nval_list(x_buffer, x_size, value, size);
+ }
+ yaffs_release_temp_buffer(dev, (u8 *) buffer, __LINE__);
+ return retval;
+}
+
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
+ const void *value, int size, int flags)
+{
+ return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
+}
+
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
+{
+ return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
+}
+
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
+ int size)
+{
+ return yaffs_do_xattrib_fetch(obj, name, value, size);
+}
+
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
+{
+ return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
+}
+
+/*---------------------------- Initialisation code -------------------------------------- */
+
+static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
+{
+
+ /* Common functions, gotta have */
+ if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
+ return 0;
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+ /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
+ if (dev->param.write_chunk_tags_fn &&
+ dev->param.read_chunk_tags_fn &&
+ !dev->param.write_chunk_fn &&
+ !dev->param.read_chunk_fn &&
+ dev->param.bad_block_fn && dev->param.query_block_fn)
+ return 1;
+#endif
+
+ /* Can use the "spare" style interface for yaffs1 */
+ if (!dev->param.is_yaffs2 &&
+ !dev->param.write_chunk_tags_fn &&
+ !dev->param.read_chunk_tags_fn &&
+ dev->param.write_chunk_fn &&
+ dev->param.read_chunk_fn &&
+ !dev->param.bad_block_fn && !dev->param.query_block_fn)
+ return 1;
+
+ return 0; /* bad */
+}
+
+static int yaffs_create_initial_dir(struct yaffs_dev *dev)
+{
+ /* Initialise the unlinked, deleted, root and lost and found directories */
+
+ dev->lost_n_found = dev->root_dir = NULL;
+ dev->unlinked_dir = dev->del_dir = NULL;
+
+ dev->unlinked_dir =
+ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+
+ dev->del_dir =
+ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
+
+ dev->root_dir =
+ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
+ YAFFS_ROOT_MODE | S_IFDIR);
+ dev->lost_n_found =
+ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
+ YAFFS_LOSTNFOUND_MODE | S_IFDIR);
+
+ if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
+ && dev->del_dir) {
+ yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
+ return YAFFS_OK;
+ }
+
+ return YAFFS_FAIL;
+}
+
+int yaffs_guts_initialise(struct yaffs_dev *dev)
+{
+ int init_failed = 0;
+ unsigned x;
+ int bits;
+
+ T(YAFFS_TRACE_TRACING,
+ (TSTR("yaffs: yaffs_guts_initialise()" TENDSTR)));
+
+ /* Check stuff that must be set */
+
+ if (!dev) {
+ T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ dev->internal_start_block = dev->param.start_block;
+ dev->internal_end_block = dev->param.end_block;
+ dev->block_offset = 0;
+ dev->chunk_offset = 0;
+ dev->n_free_chunks = 0;
+
+ dev->gc_block = 0;
+
+ if (dev->param.start_block == 0) {
+ dev->internal_start_block = dev->param.start_block + 1;
+ dev->internal_end_block = dev->param.end_block + 1;
+ dev->block_offset = 1;
+ dev->chunk_offset = dev->param.chunks_per_block;
+ }
+
+ /* Check geometry parameters. */
+
+ if ((!dev->param.inband_tags && dev->param.is_yaffs2 && dev->param.total_bytes_per_chunk < 1024) || (!dev->param.is_yaffs2 && dev->param.total_bytes_per_chunk < 512) || (dev->param.inband_tags && !dev->param.is_yaffs2) || dev->param.chunks_per_block < 2 || dev->param.n_reserved_blocks < 2 || dev->internal_start_block <= 0 || dev->internal_end_block <= 0 || dev->internal_end_block <= (dev->internal_start_block + dev->param.n_reserved_blocks + 2)) { /* otherwise it is too small */
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d "
+ TENDSTR), dev->param.total_bytes_per_chunk,
+ dev->param.is_yaffs2 ? "2" : "", dev->param.inband_tags));
+ return YAFFS_FAIL;
+ }
+
+ if (yaffs_init_nand(dev) != YAFFS_OK) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ /* Sort out space for inband tags, if required */
+ if (dev->param.inband_tags)
+ dev->data_bytes_per_chunk =
+ dev->param.total_bytes_per_chunk -
+ sizeof(struct yaffs_packed_tags2_tags_only);
+ else
+ dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
+
+ /* Got the right mix of functions? */
+ if (!yaffs_check_dev_fns(dev)) {
+ /* Function missing */
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
+
+ return YAFFS_FAIL;
+ }
+
+ if (dev->is_mounted) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR("yaffs: device already mounted\n" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ /* Finished with most checks. One or two more checks happen later on too. */
+
+ dev->is_mounted = 1;
+
+ /* OK now calculate a few things for the device */
+
+ /*
+ * Calculate all the chunk size manipulation numbers:
+ */
+ x = dev->data_bytes_per_chunk;
+ /* We always use dev->chunk_shift and dev->chunk_div */
+ dev->chunk_shift = calc_shifts(x);
+ x >>= dev->chunk_shift;
+ dev->chunk_div = x;
+ /* We only use chunk mask if chunk_div is 1 */
+ dev->chunk_mask = (1 << dev->chunk_shift) - 1;
+
+ /*
+ * Calculate chunk_grp_bits.
+ * We need to find the next power of 2 > than internal_end_block
+ */
+
+ x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
+
+ bits = calc_shifts_ceiling(x);
+
+ /* Set up tnode width if wide tnodes are enabled. */
+ if (!dev->param.wide_tnodes_disabled) {
+ /* bits must be even so that we end up with 32-bit words */
+ if (bits & 1)
+ bits++;
+ if (bits < 16)
+ dev->tnode_width = 16;
+ else
+ dev->tnode_width = bits;
+ } else {
+ dev->tnode_width = 16;
+ }
+
+ dev->tnode_mask = (1 << dev->tnode_width) - 1;
+
+ /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
+ * so if the bitwidth of the
+ * chunk range we're using is greater than 16 we need
+ * to figure out chunk shift and chunk_grp_size
+ */
+
+ if (bits <= dev->tnode_width)
+ dev->chunk_grp_bits = 0;
+ else
+ dev->chunk_grp_bits = bits - dev->tnode_width;
+
+ dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
+ if (dev->tnode_size < sizeof(struct yaffs_tnode))
+ dev->tnode_size = sizeof(struct yaffs_tnode);
+
+ dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
+
+ if (dev->param.chunks_per_block < dev->chunk_grp_size) {
+ /* We have a problem because the soft delete won't work if
+ * the chunk group size > chunks per block.
+ * This can be remedied by using larger "virtual blocks".
+ */
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR("yaffs: chunk group too large\n" TENDSTR)));
+
+ return YAFFS_FAIL;
+ }
+
+ /* OK, we've finished verifying the device, lets continue with initialisation */
+
+ /* More device initialisation */
+ dev->all_gcs = 0;
+ dev->passive_gc_count = 0;
+ dev->oldest_dirty_gc_count = 0;
+ dev->bg_gcs = 0;
+ dev->gc_block_finder = 0;
+ dev->buffered_block = -1;
+ dev->doing_buffered_block_rewrite = 0;
+ dev->n_deleted_files = 0;
+ dev->n_bg_deletions = 0;
+ dev->n_unlinked_files = 0;
+ dev->n_ecc_fixed = 0;
+ dev->n_ecc_unfixed = 0;
+ dev->n_tags_ecc_fixed = 0;
+ dev->n_tags_ecc_unfixed = 0;
+ dev->n_erase_failures = 0;
+ dev->n_erased_blocks = 0;
+ dev->gc_disable = 0;
+ dev->has_pending_prioritised_gc = 1; /* Assume the worst for now, will get fixed on first GC */
+ INIT_LIST_HEAD(&dev->dirty_dirs);
+ dev->oldest_dirty_seq = 0;
+ dev->oldest_dirty_block = 0;
+
+ /* Initialise temporary buffers and caches. */
+ if (!yaffs_init_tmp_buffers(dev))
+ init_failed = 1;
+
+ dev->cache = NULL;
+ dev->gc_cleanup_list = NULL;
+
+ if (!init_failed && dev->param.n_caches > 0) {
+ int i;
+ void *buf;
+ int cache_bytes =
+ dev->param.n_caches * sizeof(struct yaffs_cache);
+
+ if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
+ dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
+
+ dev->cache = YMALLOC(cache_bytes);
+
+ buf = (u8 *) dev->cache;
+
+ if (dev->cache)
+ memset(dev->cache, 0, cache_bytes);
+
+ for (i = 0; i < dev->param.n_caches && buf; i++) {
+ dev->cache[i].object = NULL;
+ dev->cache[i].last_use = 0;
+ dev->cache[i].dirty = 0;
+ dev->cache[i].data = buf =
+ YMALLOC_DMA(dev->param.total_bytes_per_chunk);
+ }
+ if (!buf)
+ init_failed = 1;
+
+ dev->cache_last_use = 0;
+ }
+
+ dev->cache_hits = 0;
+
+ if (!init_failed) {
+ dev->gc_cleanup_list =
+ YMALLOC(dev->param.chunks_per_block * sizeof(u32));
+ if (!dev->gc_cleanup_list)
+ init_failed = 1;
+ }
+
+ if (dev->param.is_yaffs2)
+ dev->param.use_header_file_size = 1;
+
+ if (!init_failed && !yaffs_init_blocks(dev))
+ init_failed = 1;
+
+ yaffs_init_tnodes_and_objs(dev);
+
+ if (!init_failed && !yaffs_create_initial_dir(dev))
+ init_failed = 1;
+
+ if (!init_failed) {
+ /* Now scan the flash. */
+ if (dev->param.is_yaffs2) {
+ if (yaffs2_checkpt_restore(dev)) {
+ yaffs_check_obj_details_loaded(dev->root_dir);
+ T(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
+ (TSTR
+ ("yaffs: restored from checkpoint"
+ TENDSTR)));
+ } else {
+
+ /* Clean up the mess caused by an aborted checkpoint load
+ * and scan backwards.
+ */
+ yaffs_deinit_blocks(dev);
+
+ yaffs_deinit_tnodes_and_objs(dev);
+
+ dev->n_erased_blocks = 0;
+ dev->n_free_chunks = 0;
+ dev->alloc_block = -1;
+ dev->alloc_page = -1;
+ dev->n_deleted_files = 0;
+ dev->n_unlinked_files = 0;
+ dev->n_bg_deletions = 0;
+
+ if (!init_failed && !yaffs_init_blocks(dev))
+ init_failed = 1;
+
+ yaffs_init_tnodes_and_objs(dev);
+
+ if (!init_failed
+ && !yaffs_create_initial_dir(dev))
+ init_failed = 1;
+
+ if (!init_failed && !yaffs2_scan_backwards(dev))
+ init_failed = 1;
+ }
+ } else if (!yaffs1_scan(dev)) {
+ init_failed = 1;
+ }
+
+ yaffs_strip_deleted_objs(dev);
+ yaffs_fix_hanging_objs(dev);
+ if (dev->param.empty_lost_n_found)
+ yaffs_empty_l_n_f(dev);
+ }
+
+ if (init_failed) {
+ /* Clean up the mess */
+ T(YAFFS_TRACE_TRACING,
+ (TSTR("yaffs: yaffs_guts_initialise() aborted.\n" TENDSTR)));
+
+ yaffs_deinitialise(dev);
+ return YAFFS_FAIL;
+ }
+
+ /* Zero out stats */
+ dev->n_page_reads = 0;
+ dev->n_page_writes = 0;
+ dev->n_erasures = 0;
+ dev->n_gc_copies = 0;
+ dev->n_retired_writes = 0;
+
+ dev->n_retired_blocks = 0;
+
+ yaffs_verify_free_chunks(dev);
+ yaffs_verify_blocks(dev);
+
+ /* Clean up any aborted checkpoint data */
+ if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
+ yaffs2_checkpt_invalidate(dev);
+
+ T(YAFFS_TRACE_TRACING,
+ (TSTR("yaffs: yaffs_guts_initialise() done.\n" TENDSTR)));
+ return YAFFS_OK;
+
+}
+
+void yaffs_deinitialise(struct yaffs_dev *dev)
+{
+ if (dev->is_mounted) {
+ int i;
+
+ yaffs_deinit_blocks(dev);
+ yaffs_deinit_tnodes_and_objs(dev);
+ if (dev->param.n_caches > 0 && dev->cache) {
+
+ for (i = 0; i < dev->param.n_caches; i++) {
+ if (dev->cache[i].data)
+ YFREE(dev->cache[i].data);
+ dev->cache[i].data = NULL;
+ }
+
+ YFREE(dev->cache);
+ dev->cache = NULL;
+ }
+
+ YFREE(dev->gc_cleanup_list);
+
+ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ YFREE(dev->temp_buffer[i].buffer);
+
+ dev->is_mounted = 0;
+
+ if (dev->param.deinitialise_flash_fn)
+ dev->param.deinitialise_flash_fn(dev);
+ }
+}
+
+int yaffs_count_free_chunks(struct yaffs_dev *dev)
+{
+ int n_free = 0;
+ int b;
+
+ struct yaffs_block_info *blk;
+
+ blk = dev->block_info;
+ for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
+ switch (blk->block_state) {
+ case YAFFS_BLOCK_STATE_EMPTY:
+ case YAFFS_BLOCK_STATE_ALLOCATING:
+ case YAFFS_BLOCK_STATE_COLLECTING:
+ case YAFFS_BLOCK_STATE_FULL:
+ n_free +=
+ (dev->param.chunks_per_block - blk->pages_in_use +
+ blk->soft_del_pages);
+ break;
+ default:
+ break;
+ }
+ blk++;
+ }
+
+ return n_free;
+}
+
+int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
+{
+ /* This is what we report to the outside world */
+
+ int n_free;
+ int n_dirty_caches;
+ int blocks_for_checkpt;
+ int i;
+
+ n_free = dev->n_free_chunks;
+ n_free += dev->n_deleted_files;
+
+ /* Now count the number of dirty chunks in the cache and subtract those */
+
+ for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
+ if (dev->cache[i].dirty)
+ n_dirty_caches++;
+ }
+
+ n_free -= n_dirty_caches;
+
+ n_free -=
+ ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
+
+ /* Now we figure out how much to reserve for the checkpoint and report that... */
+ blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
+
+ n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
+
+ if (n_free < 0)
+ n_free = 0;
+
+ return n_free;
+
+}
diff --git a/fs/yaffs2/yaffs_guts.h b/fs/yaffs2/yaffs_guts.h
new file mode 100644
index 0000000..307eba2
--- /dev/null
+++ b/fs/yaffs2/yaffs_guts.h
@@ -0,0 +1,915 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@...ph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_GUTS_H__
+#define __YAFFS_GUTS_H__
+
+#include "yportenv.h"
+
+#define YAFFS_OK 1
+#define YAFFS_FAIL 0
+
+/* Give us a Y=0x59,
+ * Give us an A=0x41,
+ * Give us an FF=0xFF
+ * Give us an S=0x53
+ * And what have we got...
+ */
+#define YAFFS_MAGIC 0x5941FF53
+
+#define YAFFS_NTNODES_LEVEL0 16
+#define YAFFS_TNODES_LEVEL0_BITS 4
+#define YAFFS_TNODES_LEVEL0_MASK 0xf
+
+#define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2)
+#define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1)
+#define YAFFS_TNODES_INTERNAL_MASK 0x7
+#define YAFFS_TNODES_MAX_LEVEL 6
+
+#ifndef CONFIG_YAFFS_NO_YAFFS1
+#define YAFFS_BYTES_PER_SPARE 16
+#define YAFFS_BYTES_PER_CHUNK 512
+#define YAFFS_CHUNK_SIZE_SHIFT 9
+#define YAFFS_CHUNKS_PER_BLOCK 32
+#define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
+#endif
+
+#define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024
+#define YAFFS_MIN_YAFFS2_SPARE_SIZE 32
+
+#define YAFFS_MAX_CHUNK_ID 0x000FFFFF
+
+#define YAFFS_ALLOCATION_NOBJECTS 100
+#define YAFFS_ALLOCATION_NTNODES 100
+#define YAFFS_ALLOCATION_NLINKS 100
+
+#define YAFFS_NOBJECT_BUCKETS 256
+
+#define YAFFS_OBJECT_SPACE 0x40000
+#define YAFFS_MAX_OBJECT_ID (YAFFS_OBJECT_SPACE -1)
+
+#define YAFFS_CHECKPOINT_VERSION 4
+
+#ifdef CONFIG_YAFFS_UNICODE
+#define YAFFS_MAX_NAME_LENGTH 127
+#define YAFFS_MAX_ALIAS_LENGTH 79
+#else
+#define YAFFS_MAX_NAME_LENGTH 255
+#define YAFFS_MAX_ALIAS_LENGTH 159
+#endif
+
+#define YAFFS_SHORT_NAME_LENGTH 15
+
+/* Some special object ids for pseudo objects */
+#define YAFFS_OBJECTID_ROOT 1
+#define YAFFS_OBJECTID_LOSTNFOUND 2
+#define YAFFS_OBJECTID_UNLINKED 3
+#define YAFFS_OBJECTID_DELETED 4
+
+/* Pseudo object ids for checkpointing */
+#define YAFFS_OBJECTID_SB_HEADER 0x10
+#define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20
+#define YAFFS_SEQUENCE_CHECKPOINT_DATA 0x21
+
+#define YAFFS_MAX_SHORT_OP_CACHES 20
+
+#define YAFFS_N_TEMP_BUFFERS 6
+
+/* We limit the number attempts at sucessfully saving a chunk of data.
+ * Small-page devices have 32 pages per block; large-page devices have 64.
+ * Default to something in the order of 5 to 10 blocks worth of chunks.
+ */
+#define YAFFS_WR_ATTEMPTS (5*64)
+
+/* Sequence numbers are used in YAFFS2 to determine block allocation order.
+ * The range is limited slightly to help distinguish bad numbers from good.
+ * This also allows us to perhaps in the future use special numbers for
+ * special purposes.
+ * EFFFFF00 allows the allocation of 8 blocks per second (~1Mbytes) for 15 years,
+ * and is a larger number than the lifetime of a 2GB device.
+ */
+#define YAFFS_LOWEST_SEQUENCE_NUMBER 0x00001000
+#define YAFFS_HIGHEST_SEQUENCE_NUMBER 0xEFFFFF00
+
+/* Special sequence number for bad block that failed to be marked bad */
+#define YAFFS_SEQUENCE_BAD_BLOCK 0xFFFF0000
+
+/* ChunkCache is used for short read/write operations.*/
+struct yaffs_cache {
+ struct yaffs_obj *object;
+ int chunk_id;
+ int last_use;
+ int dirty;
+ int n_bytes; /* Only valid if the cache is dirty */
+ int locked; /* Can't push out or flush while locked. */
+ u8 *data;
+};
+
+/* Tags structures in RAM
+ * NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise
+ * the structure size will get blown out.
+ */
+
+#ifndef CONFIG_YAFFS_NO_YAFFS1
+struct yaffs_tags {
+ unsigned chunk_id:20;
+ unsigned serial_number:2;
+ unsigned n_bytes_lsb:10;
+ unsigned obj_id:18;
+ unsigned ecc:12;
+ unsigned n_bytes_msb:2;
+};
+
+union yaffs_tags_union {
+ struct yaffs_tags as_tags;
+ u8 as_bytes[8];
+};
+
+#endif
+
+/* Stuff used for extended tags in YAFFS2 */
+
+enum yaffs_ecc_result {
+ YAFFS_ECC_RESULT_UNKNOWN,
+ YAFFS_ECC_RESULT_NO_ERROR,
+ YAFFS_ECC_RESULT_FIXED,
+ YAFFS_ECC_RESULT_UNFIXED
+};
+
+enum yaffs_obj_type {
+ YAFFS_OBJECT_TYPE_UNKNOWN,
+ YAFFS_OBJECT_TYPE_FILE,
+ YAFFS_OBJECT_TYPE_SYMLINK,
+ YAFFS_OBJECT_TYPE_DIRECTORY,
+ YAFFS_OBJECT_TYPE_HARDLINK,
+ YAFFS_OBJECT_TYPE_SPECIAL
+};
+
+#define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
+
+struct yaffs_ext_tags {
+
+ unsigned validity0;
+ unsigned chunk_used; /* Status of the chunk: used or unused */
+ unsigned obj_id; /* If 0 then this is not part of an object (unused) */
+ unsigned chunk_id; /* If 0 then this is a header, else a data chunk */
+ unsigned n_bytes; /* Only valid for data chunks */
+
+ /* The following stuff only has meaning when we read */
+ enum yaffs_ecc_result ecc_result;
+ unsigned block_bad;
+
+ /* YAFFS 1 stuff */
+ unsigned is_deleted; /* The chunk is marked deleted */
+ unsigned serial_number; /* Yaffs1 2-bit serial number */
+
+ /* YAFFS2 stuff */
+ unsigned seq_number; /* The sequence number of this block */
+
+ /* Extra info if this is an object header (YAFFS2 only) */
+
+ unsigned extra_available; /* There is extra info available if this is not zero */
+ unsigned extra_parent_id; /* The parent object */
+ unsigned extra_is_shrink; /* Is it a shrink header? */
+ unsigned extra_shadows; /* Does this shadow another object? */
+
+ enum yaffs_obj_type extra_obj_type; /* What object type? */
+
+ unsigned extra_length; /* Length if it is a file */
+ unsigned extra_equiv_id; /* Equivalent object Id if it is a hard link */
+
+ unsigned validity1;
+
+};
+
+/* Spare structure for YAFFS1 */
+struct yaffs_spare {
+ u8 tb0;
+ u8 tb1;
+ u8 tb2;
+ u8 tb3;
+ u8 page_status; /* set to 0 to delete the chunk */
+ u8 block_status;
+ u8 tb4;
+ u8 tb5;
+ u8 ecc1[3];
+ u8 tb6;
+ u8 tb7;
+ u8 ecc2[3];
+};
+
+/*Special structure for passing through to mtd */
+struct yaffs_nand_spare {
+ struct yaffs_spare spare;
+ int eccres1;
+ int eccres2;
+};
+
+/* Block data in RAM */
+
+enum yaffs_block_state {
+ YAFFS_BLOCK_STATE_UNKNOWN = 0,
+
+ YAFFS_BLOCK_STATE_SCANNING,
+ /* Being scanned */
+
+ YAFFS_BLOCK_STATE_NEEDS_SCANNING,
+ /* The block might have something on it (ie it is allocating or full, perhaps empty)
+ * but it needs to be scanned to determine its true state.
+ * This state is only valid during scanning.
+ * NB We tolerate empty because the pre-scanner might be incapable of deciding
+ * However, if this state is returned on a YAFFS2 device, then we expect a sequence number
+ */
+
+ YAFFS_BLOCK_STATE_EMPTY,
+ /* This block is empty */
+
+ YAFFS_BLOCK_STATE_ALLOCATING,
+ /* This block is partially allocated.
+ * At least one page holds valid data.
+ * This is the one currently being used for page
+ * allocation. Should never be more than one of these.
+ * If a block is only partially allocated at mount it is treated as full.
+ */
+
+ YAFFS_BLOCK_STATE_FULL,
+ /* All the pages in this block have been allocated.
+ * If a block was only partially allocated when mounted we treat
+ * it as fully allocated.
+ */
+
+ YAFFS_BLOCK_STATE_DIRTY,
+ /* The block was full and now all chunks have been deleted.
+ * Erase me, reuse me.
+ */
+
+ YAFFS_BLOCK_STATE_CHECKPOINT,
+ /* This block is assigned to holding checkpoint data. */
+
+ YAFFS_BLOCK_STATE_COLLECTING,
+ /* This block is being garbage collected */
+
+ YAFFS_BLOCK_STATE_DEAD
+ /* This block has failed and is not in use */
+};
+
+#define YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
+
+struct yaffs_block_info {
+
+ int soft_del_pages:10; /* number of soft deleted pages */
+ int pages_in_use:10; /* number of pages in use */
+ unsigned block_state:4; /* One of the above block states. NB use unsigned because enum is sometimes an int */
+ u32 needs_retiring:1; /* Data has failed on this block, need to get valid data off */
+ /* and retire the block. */
+ u32 skip_erased_check:1; /* If this is set we can skip the erased check on this block */
+ u32 gc_prioritise:1; /* An ECC check or blank check has failed on this block.
+ It should be prioritised for GC */
+ u32 chunk_error_strikes:3; /* How many times we've had ecc etc failures on this block and tried to reuse it */
+
+#ifdef CONFIG_YAFFS_YAFFS2
+ u32 has_shrink_hdr:1; /* This block has at least one shrink object header */
+ u32 seq_number; /* block sequence number for yaffs2 */
+#endif
+
+};
+
+/* -------------------------- Object structure -------------------------------*/
+/* This is the object structure as stored on NAND */
+
+struct yaffs_obj_hdr {
+ enum yaffs_obj_type type;
+
+ /* Apply to everything */
+ int parent_obj_id;
+ u16 sum_no_longer_used; /* checksum of name. No longer used */
+ YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+ /* The following apply to directories, files, symlinks - not hard links */
+ u32 yst_mode; /* protection */
+
+ u32 yst_uid;
+ u32 yst_gid;
+ u32 yst_atime;
+ u32 yst_mtime;
+ u32 yst_ctime;
+
+ /* File size applies to files only */
+ int file_size;
+
+ /* Equivalent object id applies to hard links only. */
+ int equiv_id;
+
+ /* Alias is for symlinks only. */
+ YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
+
+ u32 yst_rdev; /* device stuff for block and char devices (major/min) */
+
+ u32 win_ctime[2];
+ u32 win_atime[2];
+ u32 win_mtime[2];
+
+ u32 inband_shadowed_obj_id;
+ u32 inband_is_shrink;
+
+ u32 reserved[2];
+ int shadows_obj; /* This object header shadows the specified object if > 0 */
+
+ /* is_shrink applies to object headers written when we shrink the file (ie resize) */
+ u32 is_shrink;
+
+};
+
+/*--------------------------- Tnode -------------------------- */
+
+struct yaffs_tnode {
+ struct yaffs_tnode *internal[YAFFS_NTNODES_INTERNAL];
+};
+
+/*------------------------ Object -----------------------------*/
+/* An object can be one of:
+ * - a directory (no data, has children links
+ * - a regular file (data.... not prunes :->).
+ * - a symlink [symbolic link] (the alias).
+ * - a hard link
+ */
+
+struct yaffs_file_var {
+ u32 file_size;
+ u32 scanned_size;
+ u32 shrink_size;
+ int top_level;
+ struct yaffs_tnode *top;
+};
+
+struct yaffs_dir_var {
+ struct list_head children; /* list of child links */
+ struct list_head dirty; /* Entry for list of dirty directories */
+};
+
+struct yaffs_symlink_var {
+ YCHAR *alias;
+};
+
+struct yaffs_hardlink_var {
+ struct yaffs_obj *equiv_obj;
+ u32 equiv_id;
+};
+
+union yaffs_obj_var {
+ struct yaffs_file_var file_variant;
+ struct yaffs_dir_var dir_variant;
+ struct yaffs_symlink_var symlink_variant;
+ struct yaffs_hardlink_var hardlink_variant;
+};
+
+struct yaffs_obj {
+ u8 deleted:1; /* This should only apply to unlinked files. */
+ u8 soft_del:1; /* it has also been soft deleted */
+ u8 unlinked:1; /* An unlinked file. The file should be in the unlinked directory. */
+ u8 fake:1; /* A fake object has no presence on NAND. */
+ u8 rename_allowed:1; /* Some objects are not allowed to be renamed. */
+ u8 unlink_allowed:1;
+ u8 dirty:1; /* the object needs to be written to flash */
+ u8 valid:1; /* When the file system is being loaded up, this
+ * object might be created before the data
+ * is available (ie. file data records appear before the header).
+ */
+ u8 lazy_loaded:1; /* This object has been lazy loaded and is missing some detail */
+
+ u8 defered_free:1; /* For Linux kernel. Object is removed from NAND, but is
+ * still in the inode cache. Free of object is defered.
+ * until the inode is released.
+ */
+ u8 being_created:1; /* This object is still being created so skip some checks. */
+ u8 is_shadowed:1; /* This object is shadowed on the way to being renamed. */
+
+ u8 xattr_known:1; /* We know if this has object has xattribs or not. */
+ u8 has_xattr:1; /* This object has xattribs. Valid if xattr_known. */
+
+ u8 serial; /* serial number of chunk in NAND. Cached here */
+ u16 sum; /* sum of the name to speed searching */
+
+ struct yaffs_dev *my_dev; /* The device I'm on */
+
+ struct list_head hash_link; /* list of objects in this hash bucket */
+
+ struct list_head hard_links; /* all the equivalent hard linked objects */
+
+ /* directory structure stuff */
+ /* also used for linking up the free list */
+ struct yaffs_obj *parent;
+ struct list_head siblings;
+
+ /* Where's my object header in NAND? */
+ int hdr_chunk;
+
+ int n_data_chunks; /* Number of data chunks attached to the file. */
+
+ u32 obj_id; /* the object id value */
+
+ u32 yst_mode;
+
+#ifndef CONFIG_YAFFS_NO_SHORT_NAMES
+ YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1];
+#endif
+
+#ifdef CONFIG_YAFFS_WINCE
+ u32 win_ctime[2];
+ u32 win_mtime[2];
+ u32 win_atime[2];
+#else
+ u32 yst_uid;
+ u32 yst_gid;
+ u32 yst_atime;
+ u32 yst_mtime;
+ u32 yst_ctime;
+#endif
+
+ u32 yst_rdev;
+
+ void *my_inode;
+
+ enum yaffs_obj_type variant_type;
+
+ union yaffs_obj_var variant;
+
+};
+
+struct yaffs_obj_bucket {
+ struct list_head list;
+ int count;
+};
+
+/* yaffs_checkpt_obj holds the definition of an object as dumped
+ * by checkpointing.
+ */
+
+struct yaffs_checkpt_obj {
+ int struct_type;
+ u32 obj_id;
+ u32 parent_id;
+ int hdr_chunk;
+ enum yaffs_obj_type variant_type:3;
+ u8 deleted:1;
+ u8 soft_del:1;
+ u8 unlinked:1;
+ u8 fake:1;
+ u8 rename_allowed:1;
+ u8 unlink_allowed:1;
+ u8 serial;
+ int n_data_chunks;
+ u32 size_or_equiv_obj;
+};
+
+/*--------------------- Temporary buffers ----------------
+ *
+ * These are chunk-sized working buffers. Each device has a few
+ */
+
+struct yaffs_buffer {
+ u8 *buffer;
+ int line; /* track from whence this buffer was allocated */
+ int max_line;
+};
+
+/*----------------- Device ---------------------------------*/
+
+struct yaffs_param {
+ const YCHAR *name;
+
+ /*
+ * Entry parameters set up way early. Yaffs sets up the rest.
+ * The structure should be zeroed out before use so that unused
+ * and defualt values are zero.
+ */
+
+ int inband_tags; /* Use unband tags */
+ u32 total_bytes_per_chunk; /* Should be >= 512, does not need to be a power of 2 */
+ int chunks_per_block; /* does not need to be a power of 2 */
+ int spare_bytes_per_chunk; /* spare area size */
+ int start_block; /* Start block we're allowed to use */
+ int end_block; /* End block we're allowed to use */
+ int n_reserved_blocks; /* We want this tuneable so that we can reduce */
+ /* reserved blocks on NOR and RAM. */
+
+ int n_caches; /* If <= 0, then short op caching is disabled, else
+ * the number of short op caches (don't use too many).
+ * 10 to 20 is a good bet.
+ */
+ int use_nand_ecc; /* Flag to decide whether or not to use NANDECC on data (yaffs1) */
+ int no_tags_ecc; /* Flag to decide whether or not to do ECC on packed tags (yaffs2) */
+
+ int is_yaffs2; /* Use yaffs2 mode on this device */
+
+ int empty_lost_n_found; /* Auto-empty lost+found directory on mount */
+
+ int refresh_period; /* How often we should check to do a block refresh */
+
+ /* Checkpoint control. Can be set before or after initialisation */
+ u8 skip_checkpt_rd;
+ u8 skip_checkpt_wr;
+
+ int enable_xattr; /* Enable xattribs */
+
+ /* NAND access functions (Must be set before calling YAFFS) */
+
+ int (*write_chunk_fn) (struct yaffs_dev * dev,
+ int nand_chunk, const u8 * data,
+ const struct yaffs_spare * spare);
+ int (*read_chunk_fn) (struct yaffs_dev * dev,
+ int nand_chunk, u8 * data,
+ struct yaffs_spare * spare);
+ int (*erase_fn) (struct yaffs_dev * dev, int flash_block);
+ int (*initialise_flash_fn) (struct yaffs_dev * dev);
+ int (*deinitialise_flash_fn) (struct yaffs_dev * dev);
+
+#ifdef CONFIG_YAFFS_YAFFS2
+ int (*write_chunk_tags_fn) (struct yaffs_dev * dev,
+ int nand_chunk, const u8 * data,
+ const struct yaffs_ext_tags * tags);
+ int (*read_chunk_tags_fn) (struct yaffs_dev * dev,
+ int nand_chunk, u8 * data,
+ struct yaffs_ext_tags * tags);
+ int (*bad_block_fn) (struct yaffs_dev * dev, int block_no);
+ int (*query_block_fn) (struct yaffs_dev * dev, int block_no,
+ enum yaffs_block_state * state,
+ u32 * seq_number);
+#endif
+
+ /* The remove_obj_fn function must be supplied by OS flavours that
+ * need it.
+ * yaffs direct uses it to implement the faster readdir.
+ * Linux uses it to protect the directory during unlocking.
+ */
+ void (*remove_obj_fn) (struct yaffs_obj * obj);
+
+ /* Callback to mark the superblock dirty */
+ void (*sb_dirty_fn) (struct yaffs_dev * dev);
+
+ /* Callback to control garbage collection. */
+ unsigned (*gc_control) (struct yaffs_dev * dev);
+
+ /* Debug control flags. Don't use unless you know what you're doing */
+ int use_header_file_size; /* Flag to determine if we should use file sizes from the header */
+ int disable_lazy_load; /* Disable lazy loading on this device */
+ int wide_tnodes_disabled; /* Set to disable wide tnodes */
+ int disable_soft_del; /* yaffs 1 only: Set to disable the use of softdeletion. */
+
+ int defered_dir_update; /* Set to defer directory updates */
+
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+ int auto_unicode;
+#endif
+ int always_check_erased; /* Force chunk erased check always on */
+};
+
+struct yaffs_dev {
+ struct yaffs_param param;
+
+ /* Context storage. Holds extra OS specific data for this device */
+
+ void *os_context;
+ void *driver_context;
+
+ struct list_head dev_list;
+
+ /* Runtime parameters. Set up by YAFFS. */
+ int data_bytes_per_chunk;
+
+ /* Non-wide tnode stuff */
+ u16 chunk_grp_bits; /* Number of bits that need to be resolved if
+ * the tnodes are not wide enough.
+ */
+ u16 chunk_grp_size; /* == 2^^chunk_grp_bits */
+
+ /* Stuff to support wide tnodes */
+ u32 tnode_width;
+ u32 tnode_mask;
+ u32 tnode_size;
+
+ /* Stuff for figuring out file offset to chunk conversions */
+ u32 chunk_shift; /* Shift value */
+ u32 chunk_div; /* Divisor after shifting: 1 for power-of-2 sizes */
+ u32 chunk_mask; /* Mask to use for power-of-2 case */
+
+ int is_mounted;
+ int read_only;
+ int is_checkpointed;
+
+ /* Stuff to support block offsetting to support start block zero */
+ int internal_start_block;
+ int internal_end_block;
+ int block_offset;
+ int chunk_offset;
+
+ /* Runtime checkpointing stuff */
+ int checkpt_page_seq; /* running sequence number of checkpoint pages */
+ int checkpt_byte_count;
+ int checkpt_byte_offs;
+ u8 *checkpt_buffer;
+ int checkpt_open_write;
+ int blocks_in_checkpt;
+ int checkpt_cur_chunk;
+ int checkpt_cur_block;
+ int checkpt_next_block;
+ int *checkpt_block_list;
+ int checkpt_max_blocks;
+ u32 checkpt_sum;
+ u32 checkpt_xor;
+
+ int checkpoint_blocks_required; /* Number of blocks needed to store current checkpoint set */
+
+ /* Block Info */
+ struct yaffs_block_info *block_info;
+ u8 *chunk_bits; /* bitmap of chunks in use */
+ unsigned block_info_alt:1; /* was allocated using alternative strategy */
+ unsigned chunk_bits_alt:1; /* was allocated using alternative strategy */
+ int chunk_bit_stride; /* Number of bytes of chunk_bits per block.
+ * Must be consistent with chunks_per_block.
+ */
+
+ int n_erased_blocks;
+ int alloc_block; /* Current block being allocated off */
+ u32 alloc_page;
+ int alloc_block_finder; /* Used to search for next allocation block */
+
+ /* Object and Tnode memory management */
+ void *allocator;
+ int n_obj;
+ int n_tnodes;
+
+ int n_hardlinks;
+
+ struct yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS];
+ u32 bucket_finder;
+
+ int n_free_chunks;
+
+ /* Garbage collection control */
+ u32 *gc_cleanup_list; /* objects to delete at the end of a GC. */
+ u32 n_clean_ups;
+
+ unsigned has_pending_prioritised_gc; /* We think this device might have pending prioritised gcs */
+ unsigned gc_disable;
+ unsigned gc_block_finder;
+ unsigned gc_dirtiest;
+ unsigned gc_pages_in_use;
+ unsigned gc_not_done;
+ unsigned gc_block;
+ unsigned gc_chunk;
+ unsigned gc_skip;
+
+ /* Special directories */
+ struct yaffs_obj *root_dir;
+ struct yaffs_obj *lost_n_found;
+
+ /* Buffer areas for storing data to recover from write failures TODO
+ * u8 buffered_data[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];
+ * struct yaffs_spare buffered_spare[YAFFS_CHUNKS_PER_BLOCK];
+ */
+
+ int buffered_block; /* Which block is buffered here? */
+ int doing_buffered_block_rewrite;
+
+ struct yaffs_cache *cache;
+ int cache_last_use;
+
+ /* Stuff for background deletion and unlinked files. */
+ struct yaffs_obj *unlinked_dir; /* Directory where unlinked and deleted files live. */
+ struct yaffs_obj *del_dir; /* Directory where deleted objects are sent to disappear. */
+ struct yaffs_obj *unlinked_deletion; /* Current file being background deleted. */
+ int n_deleted_files; /* Count of files awaiting deletion; */
+ int n_unlinked_files; /* Count of unlinked files. */
+ int n_bg_deletions; /* Count of background deletions. */
+
+ /* Temporary buffer management */
+ struct yaffs_buffer temp_buffer[YAFFS_N_TEMP_BUFFERS];
+ int max_temp;
+ int temp_in_use;
+ int unmanaged_buffer_allocs;
+ int unmanaged_buffer_deallocs;
+
+ /* yaffs2 runtime stuff */
+ unsigned seq_number; /* Sequence number of currently allocating block */
+ unsigned oldest_dirty_seq;
+ unsigned oldest_dirty_block;
+
+ /* Block refreshing */
+ int refresh_skip; /* A skip down counter. Refresh happens when this gets to zero. */
+
+ /* Dirty directory handling */
+ struct list_head dirty_dirs; /* List of dirty directories */
+
+ /* Statistcs */
+ u32 n_page_writes;
+ u32 n_page_reads;
+ u32 n_erasures;
+ u32 n_erase_failures;
+ u32 n_gc_copies;
+ u32 all_gcs;
+ u32 passive_gc_count;
+ u32 oldest_dirty_gc_count;
+ u32 n_gc_blocks;
+ u32 bg_gcs;
+ u32 n_retired_writes;
+ u32 n_retired_blocks;
+ u32 n_ecc_fixed;
+ u32 n_ecc_unfixed;
+ u32 n_tags_ecc_fixed;
+ u32 n_tags_ecc_unfixed;
+ u32 n_deletions;
+ u32 n_unmarked_deletions;
+ u32 refresh_count;
+ u32 cache_hits;
+
+};
+
+/* The CheckpointDevice structure holds the device information that changes at runtime and
+ * must be preserved over unmount/mount cycles.
+ */
+struct yaffs_checkpt_dev {
+ int struct_type;
+ int n_erased_blocks;
+ int alloc_block; /* Current block being allocated off */
+ u32 alloc_page;
+ int n_free_chunks;
+
+ int n_deleted_files; /* Count of files awaiting deletion; */
+ int n_unlinked_files; /* Count of unlinked files. */
+ int n_bg_deletions; /* Count of background deletions. */
+
+ /* yaffs2 runtime stuff */
+ unsigned seq_number; /* Sequence number of currently allocating block */
+
+};
+
+struct yaffs_checkpt_validity {
+ int struct_type;
+ u32 magic;
+ u32 version;
+ u32 head;
+};
+
+struct yaffs_shadow_fixer {
+ int obj_id;
+ int shadowed_id;
+ struct yaffs_shadow_fixer *next;
+};
+
+/* Structure for doing xattr modifications */
+struct yaffs_xattr_mod {
+ int set; /* If 0 then this is a deletion */
+ const YCHAR *name;
+ const void *data;
+ int size;
+ int flags;
+ int result;
+};
+
+/*----------------------- YAFFS Functions -----------------------*/
+
+int yaffs_guts_initialise(struct yaffs_dev *dev);
+void yaffs_deinitialise(struct yaffs_dev *dev);
+
+int yaffs_get_n_free_chunks(struct yaffs_dev *dev);
+
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
+ struct yaffs_obj *new_dir, const YCHAR * new_name);
+
+int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name);
+int yaffs_del_obj(struct yaffs_obj *obj);
+
+int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size);
+int yaffs_get_obj_length(struct yaffs_obj *obj);
+int yaffs_get_obj_inode(struct yaffs_obj *obj);
+unsigned yaffs_get_obj_type(struct yaffs_obj *obj);
+int yaffs_get_obj_link_count(struct yaffs_obj *obj);
+
+/* File operations */
+int yaffs_file_rd(struct yaffs_obj *obj, u8 * buffer, loff_t offset,
+ int n_bytes);
+int yaffs_wr_file(struct yaffs_obj *obj, const u8 * buffer, loff_t offset,
+ int n_bytes, int write_trhrough);
+int yaffs_resize_file(struct yaffs_obj *obj, loff_t new_size);
+
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+ const YCHAR * name, u32 mode, u32 uid,
+ u32 gid);
+
+int yaffs_flush_file(struct yaffs_obj *obj, int update_time, int data_sync);
+
+/* Flushing and checkpointing */
+void yaffs_flush_whole_cache(struct yaffs_dev *dev);
+
+int yaffs_checkpoint_save(struct yaffs_dev *dev);
+int yaffs_checkpoint_restore(struct yaffs_dev *dev);
+
+/* Directory operations */
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR * name,
+ u32 mode, u32 uid, u32 gid);
+struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *the_dir,
+ const YCHAR * name);
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number);
+
+/* Link operations */
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
+ struct yaffs_obj *equiv_obj);
+
+struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj);
+
+/* Symlink operations */
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+ const YCHAR * name, u32 mode, u32 uid,
+ u32 gid, const YCHAR * alias);
+YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj);
+
+/* Special inodes (fifos, sockets and devices) */
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+ const YCHAR * name, u32 mode, u32 uid,
+ u32 gid, u32 rdev);
+
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
+ const void *value, int size, int flags);
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
+ int size);
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size);
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name);
+
+/* Special directories */
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev);
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev);
+
+void yaffs_handle_defered_free(struct yaffs_obj *obj);
+
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev);
+
+int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency);
+
+/* Debug dump */
+int yaffs_dump_obj(struct yaffs_obj *obj);
+
+void yaffs_guts_test(struct yaffs_dev *dev);
+
+/* A few useful functions to be used within the core files*/
+void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
+ int lyn);
+int yaffs_check_ff(u8 * buffer, int n_bytes);
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+ struct yaffs_block_info *bi);
+
+u8 *yaffs_get_temp_buffer(struct yaffs_dev *dev, int line_no);
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 * buffer, int line_no);
+
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+ int number,
+ enum yaffs_obj_type type);
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+ int nand_chunk, int in_scan);
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name);
+void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
+ const struct yaffs_obj_hdr *oh);
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj);
+YCHAR *yaffs_clone_str(const YCHAR * str);
+void yaffs_link_fixup(struct yaffs_dev *dev, struct yaffs_obj *hard_list);
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no);
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR * name,
+ int force, int is_shrink, int shadows,
+ struct yaffs_xattr_mod *xop);
+void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
+ int backward_scanning);
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks);
+struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev);
+struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
+ struct yaffs_file_var *file_struct,
+ u32 chunk_id,
+ struct yaffs_tnode *passed_tn);
+
+int yaffs_do_file_wr(struct yaffs_obj *in, const u8 * buffer, loff_t offset,
+ int n_bytes, int write_trhrough);
+void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size);
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev);
+
+int yaffs_count_free_chunks(struct yaffs_dev *dev);
+
+struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
+ struct yaffs_file_var *file_struct,
+ u32 chunk_id);
+
+u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+ unsigned pos);
+
+int yaffs_is_non_empty_dir(struct yaffs_obj *obj);
+#endif
diff --git a/fs/yaffs2/yaffs_yaffs1.c b/fs/yaffs2/yaffs_yaffs1.c
new file mode 100644
index 0000000..b6c43e5
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs1.c
@@ -0,0 +1,437 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@...ph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_yaffs1.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+#include "yaffs_attribs.h"
+
+int yaffs1_scan(struct yaffs_dev *dev)
+{
+ struct yaffs_ext_tags tags;
+ int blk;
+ int result;
+
+ int chunk;
+ int c;
+ int deleted;
+ enum yaffs_block_state state;
+ struct yaffs_obj *hard_list = NULL;
+ struct yaffs_block_info *bi;
+ u32 seq_number;
+ struct yaffs_obj_hdr *oh;
+ struct yaffs_obj *in;
+ struct yaffs_obj *parent;
+
+ int alloc_failed = 0;
+
+ struct yaffs_shadow_fixer *shadow_fixers = NULL;
+
+ u8 *chunk_data;
+
+ T(YAFFS_TRACE_SCAN,
+ (TSTR("yaffs1_scan starts intstartblk %d intendblk %d..." TENDSTR),
+ dev->internal_start_block, dev->internal_end_block));
+
+ chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
+
+ dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+ /* Scan all the blocks to determine their state */
+ bi = dev->block_info;
+ for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
+ blk++) {
+ yaffs_clear_chunk_bits(dev, blk);
+ bi->pages_in_use = 0;
+ bi->soft_del_pages = 0;
+
+ yaffs_query_init_block_state(dev, blk, &state, &seq_number);
+
+ bi->block_state = state;
+ bi->seq_number = seq_number;
+
+ if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
+ bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
+
+ T(YAFFS_TRACE_SCAN_DEBUG,
+ (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+ state, seq_number));
+
+ if (state == YAFFS_BLOCK_STATE_DEAD) {
+ T(YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("block %d is bad" TENDSTR), blk));
+ } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+ T(YAFFS_TRACE_SCAN_DEBUG,
+ (TSTR("Block empty " TENDSTR)));
+ dev->n_erased_blocks++;
+ dev->n_free_chunks += dev->param.chunks_per_block;
+ }
+ bi++;
+ }
+
+ /* For each block.... */
+ for (blk = dev->internal_start_block;
+ !alloc_failed && blk <= dev->internal_end_block; blk++) {
+
+ YYIELD();
+
+ bi = yaffs_get_block_info(dev, blk);
+ state = bi->block_state;
+
+ deleted = 0;
+
+ /* For each chunk in each block that needs scanning.... */
+ for (c = 0; !alloc_failed && c < dev->param.chunks_per_block &&
+ state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
+ /* Read the tags and decide what to do */
+ chunk = blk * dev->param.chunks_per_block + c;
+
+ result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL,
+ &tags);
+
+ /* Let's have a good look at this chunk... */
+
+ if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED
+ || tags.is_deleted) {
+ /* YAFFS1 only...
+ * A deleted chunk
+ */
+ deleted++;
+ dev->n_free_chunks++;
+ /*T((" %d %d deleted\n",blk,c)); */
+ } else if (!tags.chunk_used) {
+ /* An unassigned chunk in the block
+ * This means that either the block is empty or
+ * this is the one being allocated from
+ */
+
+ if (c == 0) {
+ /* We're looking at the first chunk in the block so the block is unused */
+ state = YAFFS_BLOCK_STATE_EMPTY;
+ dev->n_erased_blocks++;
+ } else {
+ /* this is the block being allocated from */
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ (" Allocating from %d %d" TENDSTR),
+ blk, c));
+ state = YAFFS_BLOCK_STATE_ALLOCATING;
+ dev->alloc_block = blk;
+ dev->alloc_page = c;
+ dev->alloc_block_finder = blk;
+ /* Set block finder here to encourage the allocator to go forth from here. */
+
+ }
+
+ dev->n_free_chunks +=
+ (dev->param.chunks_per_block - c);
+ } else if (tags.chunk_id > 0) {
+ /* chunk_id > 0 so it is a data chunk... */
+ unsigned int endpos;
+
+ yaffs_set_chunk_bit(dev, blk, c);
+ bi->pages_in_use++;
+
+ in = yaffs_find_or_create_by_number(dev,
+ tags.obj_id,
+ YAFFS_OBJECT_TYPE_FILE);
+ /* PutChunkIntoFile checks for a clash (two data chunks with
+ * the same chunk_id).
+ */
+
+ if (!in)
+ alloc_failed = 1;
+
+ if (in) {
+ if (!yaffs_put_chunk_in_file
+ (in, tags.chunk_id, chunk, 1))
+ alloc_failed = 1;
+ }
+
+ endpos =
+ (tags.chunk_id -
+ 1) * dev->data_bytes_per_chunk +
+ tags.n_bytes;
+ if (in
+ && in->variant_type ==
+ YAFFS_OBJECT_TYPE_FILE
+ && in->variant.file_variant.scanned_size <
+ endpos) {
+ in->variant.file_variant.scanned_size =
+ endpos;
+ if (!dev->param.use_header_file_size) {
+ in->variant.
+ file_variant.file_size =
+ in->variant.
+ file_variant.scanned_size;
+ }
+
+ }
+ /* T((" %d %d data %d %d\n",blk,c,tags.obj_id,tags.chunk_id)); */
+ } else {
+ /* chunk_id == 0, so it is an ObjectHeader.
+ * Thus, we read in the object header and make the object
+ */
+ yaffs_set_chunk_bit(dev, blk, c);
+ bi->pages_in_use++;
+
+ result = yaffs_rd_chunk_tags_nand(dev, chunk,
+ chunk_data,
+ NULL);
+
+ oh = (struct yaffs_obj_hdr *)chunk_data;
+
+ in = yaffs_find_by_number(dev, tags.obj_id);
+ if (in && in->variant_type != oh->type) {
+ /* This should not happen, but somehow
+ * Wev'e ended up with an obj_id that has been reused but not yet
+ * deleted, and worse still it has changed type. Delete the old object.
+ */
+
+ yaffs_del_obj(in);
+
+ in = 0;
+ }
+
+ in = yaffs_find_or_create_by_number(dev,
+ tags.obj_id,
+ oh->type);
+
+ if (!in)
+ alloc_failed = 1;
+
+ if (in && oh->shadows_obj > 0) {
+
+ struct yaffs_shadow_fixer *fixer;
+ fixer =
+ YMALLOC(sizeof
+ (struct
+ yaffs_shadow_fixer));
+ if (fixer) {
+ fixer->next = shadow_fixers;
+ shadow_fixers = fixer;
+ fixer->obj_id = tags.obj_id;
+ fixer->shadowed_id =
+ oh->shadows_obj;
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ (" Shadow fixer: %d shadows %d"
+ TENDSTR), fixer->obj_id,
+ fixer->shadowed_id));
+
+ }
+
+ }
+
+ if (in && in->valid) {
+ /* We have already filled this one. We have a duplicate and need to resolve it. */
+
+ unsigned existing_serial = in->serial;
+ unsigned new_serial =
+ tags.serial_number;
+
+ if (((existing_serial + 1) & 3) ==
+ new_serial) {
+ /* Use new one - destroy the exisiting one */
+ yaffs_chunk_del(dev,
+ in->hdr_chunk,
+ 1, __LINE__);
+ in->valid = 0;
+ } else {
+ /* Use existing - destroy this one. */
+ yaffs_chunk_del(dev, chunk, 1,
+ __LINE__);
+ }
+ }
+
+ if (in && !in->valid &&
+ (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+ tags.obj_id ==
+ YAFFS_OBJECTID_LOSTNFOUND)) {
+ /* We only load some info, don't fiddle with directory structure */
+ in->valid = 1;
+ in->variant_type = oh->type;
+
+ in->yst_mode = oh->yst_mode;
+ yaffs_load_attribs(in, oh);
+ in->hdr_chunk = chunk;
+ in->serial = tags.serial_number;
+
+ } else if (in && !in->valid) {
+ /* we need to load this info */
+
+ in->valid = 1;
+ in->variant_type = oh->type;
+
+ in->yst_mode = oh->yst_mode;
+ yaffs_load_attribs(in, oh);
+ in->hdr_chunk = chunk;
+ in->serial = tags.serial_number;
+
+ yaffs_set_obj_name_from_oh(in, oh);
+ in->dirty = 0;
+
+ /* directory stuff...
+ * hook up to parent
+ */
+
+ parent =
+ yaffs_find_or_create_by_number
+ (dev, oh->parent_obj_id,
+ YAFFS_OBJECT_TYPE_DIRECTORY);
+ if (!parent)
+ alloc_failed = 1;
+ if (parent && parent->variant_type ==
+ YAFFS_OBJECT_TYPE_UNKNOWN) {
+ /* Set up as a directory */
+ parent->variant_type =
+ YAFFS_OBJECT_TYPE_DIRECTORY;
+ INIT_LIST_HEAD(&parent->
+ variant.dir_variant.children);
+ } else if (!parent
+ || parent->variant_type !=
+ YAFFS_OBJECT_TYPE_DIRECTORY) {
+ /* Hoosterman, another problem....
+ * We're trying to use a non-directory as a directory
+ */
+
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+ TENDSTR)));
+ parent = dev->lost_n_found;
+ }
+
+ yaffs_add_obj_to_dir(parent, in);
+
+ if (0 && (parent == dev->del_dir ||
+ parent ==
+ dev->unlinked_dir)) {
+ in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
+ dev->n_deleted_files++;
+ }
+ /* Note re hardlinks.
+ * Since we might scan a hardlink before its equivalent object is scanned
+ * we put them all in a list.
+ * After scanning is complete, we should have all the objects, so we run through this
+ * list and fix up all the chains.
+ */
+
+ switch (in->variant_type) {
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* Todo got a problem */
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ if (dev->param.
+ use_header_file_size)
+
+ in->variant.
+ file_variant.file_size
+ = oh->file_size;
+
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ in->variant.
+ hardlink_variant.equiv_id =
+ oh->equiv_id;
+ in->hard_links.next =
+ (struct list_head *)
+ hard_list;
+ hard_list = in;
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ /* Do nothing */
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ /* Do nothing */
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ in->variant.symlink_variant.
+ alias =
+ yaffs_clone_str(oh->alias);
+ if (!in->variant.
+ symlink_variant.alias)
+ alloc_failed = 1;
+ break;
+ }
+
+ }
+ }
+ }
+
+ if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+ /* If we got this far while scanning, then the block is fully allocated. */
+ state = YAFFS_BLOCK_STATE_FULL;
+ }
+
+ if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
+ /* If the block was partially allocated then treat it as fully allocated. */
+ state = YAFFS_BLOCK_STATE_FULL;
+ dev->alloc_block = -1;
+ }
+
+ bi->block_state = state;
+
+ /* Now let's see if it was dirty */
+ if (bi->pages_in_use == 0 &&
+ !bi->has_shrink_hdr &&
+ bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+ yaffs_block_became_dirty(dev, blk);
+ }
+
+ }
+
+ /* Ok, we've done all the scanning.
+ * Fix up the hard link chains.
+ * We should now have scanned all the objects, now it's time to add these
+ * hardlinks.
+ */
+
+ yaffs_link_fixup(dev, hard_list);
+
+ /* Fix up any shadowed objects */
+ {
+ struct yaffs_shadow_fixer *fixer;
+ struct yaffs_obj *obj;
+
+ while (shadow_fixers) {
+ fixer = shadow_fixers;
+ shadow_fixers = fixer->next;
+ /* Complete the rename transaction by deleting the shadowed object
+ * then setting the object header to unshadowed.
+ */
+ obj = yaffs_find_by_number(dev, fixer->shadowed_id);
+ if (obj)
+ yaffs_del_obj(obj);
+
+ obj = yaffs_find_by_number(dev, fixer->obj_id);
+
+ if (obj)
+ yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
+
+ YFREE(fixer);
+ }
+ }
+
+ yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
+
+ if (alloc_failed)
+ return YAFFS_FAIL;
+
+ T(YAFFS_TRACE_SCAN, (TSTR("yaffs1_scan ends" TENDSTR)));
+
+ return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_yaffs1.h b/fs/yaffs2/yaffs_yaffs1.h
new file mode 100644
index 0000000..db23e04
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs1.h
@@ -0,0 +1,22 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@...ph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS1_H__
+#define __YAFFS_YAFFS1_H__
+
+#include "yaffs_guts.h"
+int yaffs1_scan(struct yaffs_dev *dev);
+
+#endif
diff --git a/fs/yaffs2/yaffs_yaffs2.c b/fs/yaffs2/yaffs_yaffs2.c
new file mode 100644
index 0000000..4f11765
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.c
@@ -0,0 +1,1620 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@...ph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_checkptrw.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_nand.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_verify.h"
+#include "yaffs_attribs.h"
+
+/*
+ * Checkpoints are really no benefit on very small partitions.
+ *
+ * To save space on small partitions don't bother with checkpoints unless
+ * the partition is at least this big.
+ */
+#define YAFFS_CHECKPOINT_MIN_BLOCKS 60
+
+#define YAFFS_SMALL_HOLE_THRESHOLD 4
+
+/*
+ * Oldest Dirty Sequence Number handling.
+ */
+
+/* yaffs_calc_oldest_dirty_seq()
+ * yaffs2_find_oldest_dirty_seq()
+ * Calculate the oldest dirty sequence number if we don't know it.
+ */
+void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev)
+{
+ int i;
+ unsigned seq;
+ unsigned block_no = 0;
+ struct yaffs_block_info *b;
+
+ if (!dev->param.is_yaffs2)
+ return;
+
+ /* Find the oldest dirty sequence number. */
+ seq = dev->seq_number + 1;
+ b = dev->block_info;
+ for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+ if (b->block_state == YAFFS_BLOCK_STATE_FULL &&
+ (b->pages_in_use - b->soft_del_pages) <
+ dev->param.chunks_per_block && b->seq_number < seq) {
+ seq = b->seq_number;
+ block_no = i;
+ }
+ b++;
+ }
+
+ if (block_no) {
+ dev->oldest_dirty_seq = seq;
+ dev->oldest_dirty_block = block_no;
+ }
+
+}
+
+void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev)
+{
+ if (!dev->param.is_yaffs2)
+ return;
+
+ if (!dev->oldest_dirty_seq)
+ yaffs_calc_oldest_dirty_seq(dev);
+}
+
+/*
+ * yaffs_clear_oldest_dirty_seq()
+ * Called when a block is erased or marked bad. (ie. when its seq_number
+ * becomes invalid). If the value matches the oldest then we clear
+ * dev->oldest_dirty_seq to force its recomputation.
+ */
+void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
+ struct yaffs_block_info *bi)
+{
+
+ if (!dev->param.is_yaffs2)
+ return;
+
+ if (!bi || bi->seq_number == dev->oldest_dirty_seq) {
+ dev->oldest_dirty_seq = 0;
+ dev->oldest_dirty_block = 0;
+ }
+}
+
+/*
+ * yaffs2_update_oldest_dirty_seq()
+ * Update the oldest dirty sequence number whenever we dirty a block.
+ * Only do this if the oldest_dirty_seq is actually being tracked.
+ */
+void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
+ struct yaffs_block_info *bi)
+{
+ if (!dev->param.is_yaffs2)
+ return;
+
+ if (dev->oldest_dirty_seq) {
+ if (dev->oldest_dirty_seq > bi->seq_number) {
+ dev->oldest_dirty_seq = bi->seq_number;
+ dev->oldest_dirty_block = block_no;
+ }
+ }
+}
+
+int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi)
+{
+
+ if (!dev->param.is_yaffs2)
+ return 1; /* disqualification only applies to yaffs2. */
+
+ if (!bi->has_shrink_hdr)
+ return 1; /* can gc */
+
+ yaffs2_find_oldest_dirty_seq(dev);
+
+ /* Can't do gc of this block if there are any blocks older than this one that have
+ * discarded pages.
+ */
+ return (bi->seq_number <= dev->oldest_dirty_seq);
+}
+
+/*
+ * yaffs2_find_refresh_block()
+ * periodically finds the oldest full block by sequence number for refreshing.
+ * Only for yaffs2.
+ */
+u32 yaffs2_find_refresh_block(struct yaffs_dev * dev)
+{
+ u32 b;
+
+ u32 oldest = 0;
+ u32 oldest_seq = 0;
+
+ struct yaffs_block_info *bi;
+
+ if (!dev->param.is_yaffs2)
+ return oldest;
+
+ /*
+ * If refresh period < 10 then refreshing is disabled.
+ */
+ if (dev->param.refresh_period < 10)
+ return oldest;
+
+ /*
+ * Fix broken values.
+ */
+ if (dev->refresh_skip > dev->param.refresh_period)
+ dev->refresh_skip = dev->param.refresh_period;
+
+ if (dev->refresh_skip > 0)
+ return oldest;
+
+ /*
+ * Refresh skip is now zero.
+ * We'll do a refresh this time around....
+ * Update the refresh skip and find the oldest block.
+ */
+ dev->refresh_skip = dev->param.refresh_period;
+ dev->refresh_count++;
+ bi = dev->block_info;
+ for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
+
+ if (bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+
+ if (oldest < 1 || bi->seq_number < oldest_seq) {
+ oldest = b;
+ oldest_seq = bi->seq_number;
+ }
+ }
+ bi++;
+ }
+
+ if (oldest > 0) {
+ T(YAFFS_TRACE_GC,
+ (TSTR
+ ("GC refresh count %d selected block %d with seq_number %d"
+ TENDSTR), dev->refresh_count, oldest, oldest_seq));
+ }
+
+ return oldest;
+}
+
+int yaffs2_checkpt_required(struct yaffs_dev *dev)
+{
+ int nblocks;
+
+ if (!dev->param.is_yaffs2)
+ return 0;
+
+ nblocks = dev->internal_end_block - dev->internal_start_block + 1;
+
+ return !dev->param.skip_checkpt_wr &&
+ !dev->read_only && (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
+}
+
+int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev)
+{
+ int retval;
+
+ if (!dev->param.is_yaffs2)
+ return 0;
+
+ if (!dev->checkpoint_blocks_required && yaffs2_checkpt_required(dev)) {
+ /* Not a valid value so recalculate */
+ int n_bytes = 0;
+ int n_blocks;
+ int dev_blocks =
+ (dev->param.end_block - dev->param.start_block + 1);
+
+ n_bytes += sizeof(struct yaffs_checkpt_validity);
+ n_bytes += sizeof(struct yaffs_checkpt_dev);
+ n_bytes += dev_blocks * sizeof(struct yaffs_block_info);
+ n_bytes += dev_blocks * dev->chunk_bit_stride;
+ n_bytes +=
+ (sizeof(struct yaffs_checkpt_obj) +
+ sizeof(u32)) * (dev->n_obj);
+ n_bytes += (dev->tnode_size + sizeof(u32)) * (dev->n_tnodes);
+ n_bytes += sizeof(struct yaffs_checkpt_validity);
+ n_bytes += sizeof(u32); /* checksum */
+
+ /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
+
+ n_blocks =
+ (n_bytes /
+ (dev->data_bytes_per_chunk *
+ dev->param.chunks_per_block)) + 3;
+
+ dev->checkpoint_blocks_required = n_blocks;
+ }
+
+ retval = dev->checkpoint_blocks_required - dev->blocks_in_checkpt;
+ if (retval < 0)
+ retval = 0;
+ return retval;
+}
+
+/*--------------------- Checkpointing --------------------*/
+
+static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head)
+{
+ struct yaffs_checkpt_validity cp;
+
+ memset(&cp, 0, sizeof(cp));
+
+ cp.struct_type = sizeof(cp);
+ cp.magic = YAFFS_MAGIC;
+ cp.version = YAFFS_CHECKPOINT_VERSION;
+ cp.head = (head) ? 1 : 0;
+
+ return (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)) ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head)
+{
+ struct yaffs_checkpt_validity cp;
+ int ok;
+
+ ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+ if (ok)
+ ok = (cp.struct_type == sizeof(cp)) &&
+ (cp.magic == YAFFS_MAGIC) &&
+ (cp.version == YAFFS_CHECKPOINT_VERSION) &&
+ (cp.head == ((head) ? 1 : 0));
+ return ok ? 1 : 0;
+}
+
+static void yaffs2_dev_to_checkpt_dev(struct yaffs_checkpt_dev *cp,
+ struct yaffs_dev *dev)
+{
+ cp->n_erased_blocks = dev->n_erased_blocks;
+ cp->alloc_block = dev->alloc_block;
+ cp->alloc_page = dev->alloc_page;
+ cp->n_free_chunks = dev->n_free_chunks;
+
+ cp->n_deleted_files = dev->n_deleted_files;
+ cp->n_unlinked_files = dev->n_unlinked_files;
+ cp->n_bg_deletions = dev->n_bg_deletions;
+ cp->seq_number = dev->seq_number;
+
+}
+
+static void yaffs_checkpt_dev_to_dev(struct yaffs_dev *dev,
+ struct yaffs_checkpt_dev *cp)
+{
+ dev->n_erased_blocks = cp->n_erased_blocks;
+ dev->alloc_block = cp->alloc_block;
+ dev->alloc_page = cp->alloc_page;
+ dev->n_free_chunks = cp->n_free_chunks;
+
+ dev->n_deleted_files = cp->n_deleted_files;
+ dev->n_unlinked_files = cp->n_unlinked_files;
+ dev->n_bg_deletions = cp->n_bg_deletions;
+ dev->seq_number = cp->seq_number;
+}
+
+static int yaffs2_wr_checkpt_dev(struct yaffs_dev *dev)
+{
+ struct yaffs_checkpt_dev cp;
+ u32 n_bytes;
+ u32 n_blocks =
+ (dev->internal_end_block - dev->internal_start_block + 1);
+
+ int ok;
+
+ /* Write device runtime values */
+ yaffs2_dev_to_checkpt_dev(&cp, dev);
+ cp.struct_type = sizeof(cp);
+
+ ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+ /* Write block info */
+ if (ok) {
+ n_bytes = n_blocks * sizeof(struct yaffs_block_info);
+ ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) ==
+ n_bytes);
+ }
+
+ /* Write chunk bits */
+ if (ok) {
+ n_bytes = n_blocks * dev->chunk_bit_stride;
+ ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) ==
+ n_bytes);
+ }
+ return ok ? 1 : 0;
+
+}
+
+static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev)
+{
+ struct yaffs_checkpt_dev cp;
+ u32 n_bytes;
+ u32 n_blocks =
+ (dev->internal_end_block - dev->internal_start_block + 1);
+
+ int ok;
+
+ ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+ if (!ok)
+ return 0;
+
+ if (cp.struct_type != sizeof(cp))
+ return 0;
+
+ yaffs_checkpt_dev_to_dev(dev, &cp);
+
+ n_bytes = n_blocks * sizeof(struct yaffs_block_info);
+
+ ok = (yaffs2_checkpt_rd(dev, dev->block_info, n_bytes) == n_bytes);
+
+ if (!ok)
+ return 0;
+ n_bytes = n_blocks * dev->chunk_bit_stride;
+
+ ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) == n_bytes);
+
+ return ok ? 1 : 0;
+}
+
+static void yaffs2_obj_checkpt_obj(struct yaffs_checkpt_obj *cp,
+ struct yaffs_obj *obj)
+{
+
+ cp->obj_id = obj->obj_id;
+ cp->parent_id = (obj->parent) ? obj->parent->obj_id : 0;
+ cp->hdr_chunk = obj->hdr_chunk;
+ cp->variant_type = obj->variant_type;
+ cp->deleted = obj->deleted;
+ cp->soft_del = obj->soft_del;
+ cp->unlinked = obj->unlinked;
+ cp->fake = obj->fake;
+ cp->rename_allowed = obj->rename_allowed;
+ cp->unlink_allowed = obj->unlink_allowed;
+ cp->serial = obj->serial;
+ cp->n_data_chunks = obj->n_data_chunks;
+
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+ cp->size_or_equiv_obj = obj->variant.file_variant.file_size;
+ else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
+ cp->size_or_equiv_obj = obj->variant.hardlink_variant.equiv_id;
+}
+
+static int taffs2_checkpt_obj_to_obj(struct yaffs_obj *obj,
+ struct yaffs_checkpt_obj *cp)
+{
+
+ struct yaffs_obj *parent;
+
+ if (obj->variant_type != cp->variant_type) {
+ T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
+ TCONT
+ ("chunk %d does not match existing object type %d")
+ TENDSTR), cp->obj_id,
+ cp->variant_type, cp->hdr_chunk,
+ obj->variant_type));
+ return 0;
+ }
+
+ obj->obj_id = cp->obj_id;
+
+ if (cp->parent_id)
+ parent = yaffs_find_or_create_by_number(obj->my_dev,
+ cp->parent_id,
+ YAFFS_OBJECT_TYPE_DIRECTORY);
+ else
+ parent = NULL;
+
+ if (parent) {
+ if (parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+ T(YAFFS_TRACE_ALWAYS,
+ (TSTR
+ ("Checkpoint read object %d parent %d type %d"
+ TCONT(" chunk %d Parent type, %d, not directory")
+ TENDSTR), cp->obj_id, cp->parent_id,
+ cp->variant_type, cp->hdr_chunk,
+ parent->variant_type));
+ return 0;
+ }
+ yaffs_add_obj_to_dir(parent, obj);
+ }
+
+ obj->hdr_chunk = cp->hdr_chunk;
+ obj->variant_type = cp->variant_type;
+ obj->deleted = cp->deleted;
+ obj->soft_del = cp->soft_del;
+ obj->unlinked = cp->unlinked;
+ obj->fake = cp->fake;
+ obj->rename_allowed = cp->rename_allowed;
+ obj->unlink_allowed = cp->unlink_allowed;
+ obj->serial = cp->serial;
+ obj->n_data_chunks = cp->n_data_chunks;
+
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+ obj->variant.file_variant.file_size = cp->size_or_equiv_obj;
+ else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
+ obj->variant.hardlink_variant.equiv_id = cp->size_or_equiv_obj;
+
+ if (obj->hdr_chunk > 0)
+ obj->lazy_loaded = 1;
+ return 1;
+}
+
+static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in,
+ struct yaffs_tnode *tn, u32 level,
+ int chunk_offset)
+{
+ int i;
+ struct yaffs_dev *dev = in->my_dev;
+ int ok = 1;
+
+ if (tn) {
+ if (level > 0) {
+
+ for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
+ if (tn->internal[i]) {
+ ok = yaffs2_checkpt_tnode_worker(in,
+ tn->
+ internal
+ [i],
+ level -
+ 1,
+ (chunk_offset
+ <<
+ YAFFS_TNODES_INTERNAL_BITS)
+ + i);
+ }
+ }
+ } else if (level == 0) {
+ u32 base_offset =
+ chunk_offset << YAFFS_TNODES_LEVEL0_BITS;
+ ok = (yaffs2_checkpt_wr
+ (dev, &base_offset,
+ sizeof(base_offset)) == sizeof(base_offset));
+ if (ok)
+ ok = (yaffs2_checkpt_wr
+ (dev, tn,
+ dev->tnode_size) == dev->tnode_size);
+ }
+ }
+
+ return ok;
+
+}
+
+static int yaffs2_wr_checkpt_tnodes(struct yaffs_obj *obj)
+{
+ u32 end_marker = ~0;
+ int ok = 1;
+
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) {
+ ok = yaffs2_checkpt_tnode_worker(obj,
+ obj->variant.file_variant.top,
+ obj->variant.file_variant.
+ top_level, 0);
+ if (ok)
+ ok = (yaffs2_checkpt_wr
+ (obj->my_dev, &end_marker,
+ sizeof(end_marker)) == sizeof(end_marker));
+ }
+
+ return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj)
+{
+ u32 base_chunk;
+ int ok = 1;
+ struct yaffs_dev *dev = obj->my_dev;
+ struct yaffs_file_var *file_stuct_ptr = &obj->variant.file_variant;
+ struct yaffs_tnode *tn;
+ int nread = 0;
+
+ ok = (yaffs2_checkpt_rd(dev, &base_chunk, sizeof(base_chunk)) ==
+ sizeof(base_chunk));
+
+ while (ok && (~base_chunk)) {
+ nread++;
+ /* Read level 0 tnode */
+
+ tn = yaffs_get_tnode(dev);
+ if (tn) {
+ ok = (yaffs2_checkpt_rd(dev, tn, dev->tnode_size) ==
+ dev->tnode_size);
+ } else {
+ ok = 0;
+ }
+
+ if (tn && ok)
+ ok = yaffs_add_find_tnode_0(dev,
+ file_stuct_ptr,
+ base_chunk, tn) ? 1 : 0;
+
+ if (ok)
+ ok = (yaffs2_checkpt_rd
+ (dev, &base_chunk,
+ sizeof(base_chunk)) == sizeof(base_chunk));
+
+ }
+
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
+ nread, base_chunk, ok));
+
+ return ok ? 1 : 0;
+}
+
+static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
+{
+ struct yaffs_obj *obj;
+ struct yaffs_checkpt_obj cp;
+ int i;
+ int ok = 1;
+ struct list_head *lh;
+
+ /* Iterate through the objects in each hash entry,
+ * dumping them to the checkpointing stream.
+ */
+
+ for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
+ list_for_each(lh, &dev->obj_bucket[i].list) {
+ if (lh) {
+ obj =
+ list_entry(lh, struct yaffs_obj, hash_link);
+ if (!obj->defered_free) {
+ yaffs2_obj_checkpt_obj(&cp, obj);
+ cp.struct_type = sizeof(cp);
+
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR
+ ("Checkpoint write object %d parent %d type %d chunk %d obj addr %p"
+ TENDSTR), cp.obj_id, cp.parent_id,
+ cp.variant_type, cp.hdr_chunk, obj));
+
+ ok = (yaffs2_checkpt_wr
+ (dev, &cp,
+ sizeof(cp)) == sizeof(cp));
+
+ if (ok
+ && obj->variant_type ==
+ YAFFS_OBJECT_TYPE_FILE)
+ ok = yaffs2_wr_checkpt_tnodes
+ (obj);
+ }
+ }
+ }
+ }
+
+ /* Dump end of list */
+ memset(&cp, 0xFF, sizeof(struct yaffs_checkpt_obj));
+ cp.struct_type = sizeof(cp);
+
+ if (ok)
+ ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+ return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev)
+{
+ struct yaffs_obj *obj;
+ struct yaffs_checkpt_obj cp;
+ int ok = 1;
+ int done = 0;
+ struct yaffs_obj *hard_list = NULL;
+
+ while (ok && !done) {
+ ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+ if (cp.struct_type != sizeof(cp)) {
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("struct size %d instead of %d ok %d" TENDSTR),
+ cp.struct_type, (int)sizeof(cp), ok));
+ ok = 0;
+ }
+
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR
+ ("Checkpoint read object %d parent %d type %d chunk %d "
+ TENDSTR), cp.obj_id, cp.parent_id, cp.variant_type,
+ cp.hdr_chunk));
+
+ if (ok && cp.obj_id == ~0) {
+ done = 1;
+ } else if (ok) {
+ obj =
+ yaffs_find_or_create_by_number(dev, cp.obj_id,
+ cp.variant_type);
+ if (obj) {
+ ok = taffs2_checkpt_obj_to_obj(obj, &cp);
+ if (!ok)
+ break;
+ if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) {
+ ok = yaffs2_rd_checkpt_tnodes(obj);
+ } else if (obj->variant_type ==
+ YAFFS_OBJECT_TYPE_HARDLINK) {
+ obj->hard_links.next =
+ (struct list_head *)hard_list;
+ hard_list = obj;
+ }
+ } else {
+ ok = 0;
+ }
+ }
+ }
+
+ if (ok)
+ yaffs_link_fixup(dev, hard_list);
+
+ return ok ? 1 : 0;
+}
+
+static int yaffs2_wr_checkpt_sum(struct yaffs_dev *dev)
+{
+ u32 checkpt_sum;
+ int ok;
+
+ yaffs2_get_checkpt_sum(dev, &checkpt_sum);
+
+ ok = (yaffs2_checkpt_wr(dev, &checkpt_sum, sizeof(checkpt_sum)) ==
+ sizeof(checkpt_sum));
+
+ if (!ok)
+ return 0;
+
+ return 1;
+}
+
+static int yaffs2_rd_checkpt_sum(struct yaffs_dev *dev)
+{
+ u32 checkpt_sum0;
+ u32 checkpt_sum1;
+ int ok;
+
+ yaffs2_get_checkpt_sum(dev, &checkpt_sum0);
+
+ ok = (yaffs2_checkpt_rd(dev, &checkpt_sum1, sizeof(checkpt_sum1)) ==
+ sizeof(checkpt_sum1));
+
+ if (!ok)
+ return 0;
+
+ if (checkpt_sum0 != checkpt_sum1)
+ return 0;
+
+ return 1;
+}
+
+static int yaffs2_wr_checkpt_data(struct yaffs_dev *dev)
+{
+ int ok = 1;
+
+ if (!yaffs2_checkpt_required(dev)) {
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("skipping checkpoint write" TENDSTR)));
+ ok = 0;
+ }
+
+ if (ok)
+ ok = yaffs2_checkpt_open(dev, 1);
+
+ if (ok) {
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("write checkpoint validity" TENDSTR)));
+ ok = yaffs2_wr_checkpt_validity_marker(dev, 1);
+ }
+ if (ok) {
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("write checkpoint device" TENDSTR)));
+ ok = yaffs2_wr_checkpt_dev(dev);
+ }
+ if (ok) {
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("write checkpoint objects" TENDSTR)));
+ ok = yaffs2_wr_checkpt_objs(dev);
+ }
+ if (ok) {
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("write checkpoint validity" TENDSTR)));
+ ok = yaffs2_wr_checkpt_validity_marker(dev, 0);
+ }
+
+ if (ok)
+ ok = yaffs2_wr_checkpt_sum(dev);
+
+ if (!yaffs_checkpt_close(dev))
+ ok = 0;
+
+ if (ok)
+ dev->is_checkpointed = 1;
+ else
+ dev->is_checkpointed = 0;
+
+ return dev->is_checkpointed;
+}
+
+static int yaffs2_rd_checkpt_data(struct yaffs_dev *dev)
+{
+ int ok = 1;
+
+ if (!dev->param.is_yaffs2)
+ ok = 0;
+
+ if (ok && dev->param.skip_checkpt_rd) {
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("skipping checkpoint read" TENDSTR)));
+ ok = 0;
+ }
+
+ if (ok)
+ ok = yaffs2_checkpt_open(dev, 0); /* open for read */
+
+ if (ok) {
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("read checkpoint validity" TENDSTR)));
+ ok = yaffs2_rd_checkpt_validity_marker(dev, 1);
+ }
+ if (ok) {
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("read checkpoint device" TENDSTR)));
+ ok = yaffs2_rd_checkpt_dev(dev);
+ }
+ if (ok) {
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("read checkpoint objects" TENDSTR)));
+ ok = yaffs2_rd_checkpt_objs(dev);
+ }
+ if (ok) {
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("read checkpoint validity" TENDSTR)));
+ ok = yaffs2_rd_checkpt_validity_marker(dev, 0);
+ }
+
+ if (ok) {
+ ok = yaffs2_rd_checkpt_sum(dev);
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("read checkpoint checksum %d" TENDSTR), ok));
+ }
+
+ if (!yaffs_checkpt_close(dev))
+ ok = 0;
+
+ if (ok)
+ dev->is_checkpointed = 1;
+ else
+ dev->is_checkpointed = 0;
+
+ return ok ? 1 : 0;
+
+}
+
+void yaffs2_checkpt_invalidate(struct yaffs_dev *dev)
+{
+ if (dev->is_checkpointed || dev->blocks_in_checkpt > 0) {
+ dev->is_checkpointed = 0;
+ yaffs2_checkpt_invalidate_stream(dev);
+ }
+ if (dev->param.sb_dirty_fn)
+ dev->param.sb_dirty_fn(dev);
+}
+
+int yaffs_checkpoint_save(struct yaffs_dev *dev)
+{
+
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("save entry: is_checkpointed %d" TENDSTR),
+ dev->is_checkpointed));
+
+ yaffs_verify_objects(dev);
+ yaffs_verify_blocks(dev);
+ yaffs_verify_free_chunks(dev);
+
+ if (!dev->is_checkpointed) {
+ yaffs2_checkpt_invalidate(dev);
+ yaffs2_wr_checkpt_data(dev);
+ }
+
+ T(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
+ (TSTR("save exit: is_checkpointed %d" TENDSTR),
+ dev->is_checkpointed));
+
+ return dev->is_checkpointed;
+}
+
+int yaffs2_checkpt_restore(struct yaffs_dev *dev)
+{
+ int retval;
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("restore entry: is_checkpointed %d" TENDSTR),
+ dev->is_checkpointed));
+
+ retval = yaffs2_rd_checkpt_data(dev);
+
+ if (dev->is_checkpointed) {
+ yaffs_verify_objects(dev);
+ yaffs_verify_blocks(dev);
+ yaffs_verify_free_chunks(dev);
+ }
+
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("restore exit: is_checkpointed %d" TENDSTR),
+ dev->is_checkpointed));
+
+ return retval;
+}
+
+int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
+{
+ /* if new_size > old_file_size.
+ * We're going to be writing a hole.
+ * If the hole is small then write zeros otherwise write a start of hole marker.
+ */
+
+ loff_t old_file_size;
+ int increase;
+ int small_hole;
+ int result = YAFFS_OK;
+ struct yaffs_dev *dev = NULL;
+
+ u8 *local_buffer = NULL;
+
+ int small_increase_ok = 0;
+
+ if (!obj)
+ return YAFFS_FAIL;
+
+ if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
+ return YAFFS_FAIL;
+
+ dev = obj->my_dev;
+
+ /* Bail out if not yaffs2 mode */
+ if (!dev->param.is_yaffs2)
+ return YAFFS_OK;
+
+ old_file_size = obj->variant.file_variant.file_size;
+
+ if (new_size <= old_file_size)
+ return YAFFS_OK;
+
+ increase = new_size - old_file_size;
+
+ if (increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->data_bytes_per_chunk &&
+ yaffs_check_alloc_available(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
+ small_hole = 1;
+ else
+ small_hole = 0;
+
+ if (small_hole)
+ local_buffer = yaffs_get_temp_buffer(dev, __LINE__);
+
+ if (local_buffer) {
+ /* fill hole with zero bytes */
+ int pos = old_file_size;
+ int this_write;
+ int written;
+ memset(local_buffer, 0, dev->data_bytes_per_chunk);
+ small_increase_ok = 1;
+
+ while (increase > 0 && small_increase_ok) {
+ this_write = increase;
+ if (this_write > dev->data_bytes_per_chunk)
+ this_write = dev->data_bytes_per_chunk;
+ written =
+ yaffs_do_file_wr(obj, local_buffer, pos, this_write,
+ 0);
+ if (written == this_write) {
+ pos += this_write;
+ increase -= this_write;
+ } else {
+ small_increase_ok = 0;
+ }
+ }
+
+ yaffs_release_temp_buffer(dev, local_buffer, __LINE__);
+
+ /* If we were out of space then reverse any chunks we've added */
+ if (!small_increase_ok)
+ yaffs_resize_file_down(obj, old_file_size);
+ }
+
+ if (!small_increase_ok &&
+ obj->parent &&
+ obj->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
+ obj->parent->obj_id != YAFFS_OBJECTID_DELETED) {
+ /* Write a hole start header with the old file size */
+ yaffs_update_oh(obj, NULL, 0, 1, 0, NULL);
+ }
+
+ return result;
+
+}
+
+struct yaffs_block_index {
+ int seq;
+ int block;
+};
+
+static int yaffs2_ybicmp(const void *a, const void *b)
+{
+ int aseq = ((struct yaffs_block_index *)a)->seq;
+ int bseq = ((struct yaffs_block_index *)b)->seq;
+ int ablock = ((struct yaffs_block_index *)a)->block;
+ int bblock = ((struct yaffs_block_index *)b)->block;
+ if (aseq == bseq)
+ return ablock - bblock;
+ else
+ return aseq - bseq;
+}
+
+int yaffs2_scan_backwards(struct yaffs_dev *dev)
+{
+ struct yaffs_ext_tags tags;
+ int blk;
+ int block_iter;
+ int start_iter;
+ int end_iter;
+ int n_to_scan = 0;
+
+ int chunk;
+ int result;
+ int c;
+ int deleted;
+ enum yaffs_block_state state;
+ struct yaffs_obj *hard_list = NULL;
+ struct yaffs_block_info *bi;
+ u32 seq_number;
+ struct yaffs_obj_hdr *oh;
+ struct yaffs_obj *in;
+ struct yaffs_obj *parent;
+ int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+ int is_unlinked;
+ u8 *chunk_data;
+
+ int file_size;
+ int is_shrink;
+ int found_chunks;
+ int equiv_id;
+ int alloc_failed = 0;
+
+ struct yaffs_block_index *block_index = NULL;
+ int alt_block_index = 0;
+
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ ("yaffs2_scan_backwards starts intstartblk %d intendblk %d..."
+ TENDSTR), dev->internal_start_block, dev->internal_end_block));
+
+ dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+ block_index = YMALLOC(n_blocks * sizeof(struct yaffs_block_index));
+
+ if (!block_index) {
+ block_index =
+ YMALLOC_ALT(n_blocks * sizeof(struct yaffs_block_index));
+ alt_block_index = 1;
+ }
+
+ if (!block_index) {
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ ("yaffs2_scan_backwards() could not allocate block index!"
+ TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ dev->blocks_in_checkpt = 0;
+
+ chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
+
+ /* Scan all the blocks to determine their state */
+ bi = dev->block_info;
+ for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
+ blk++) {
+ yaffs_clear_chunk_bits(dev, blk);
+ bi->pages_in_use = 0;
+ bi->soft_del_pages = 0;
+
+ yaffs_query_init_block_state(dev, blk, &state, &seq_number);
+
+ bi->block_state = state;
+ bi->seq_number = seq_number;
+
+ if (bi->seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA)
+ bi->block_state = state = YAFFS_BLOCK_STATE_CHECKPOINT;
+ if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
+ bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
+
+ T(YAFFS_TRACE_SCAN_DEBUG,
+ (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+ state, seq_number));
+
+ if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
+ dev->blocks_in_checkpt++;
+
+ } else if (state == YAFFS_BLOCK_STATE_DEAD) {
+ T(YAFFS_TRACE_BAD_BLOCKS,
+ (TSTR("block %d is bad" TENDSTR), blk));
+ } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+ T(YAFFS_TRACE_SCAN_DEBUG,
+ (TSTR("Block empty " TENDSTR)));
+ dev->n_erased_blocks++;
+ dev->n_free_chunks += dev->param.chunks_per_block;
+ } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+
+ /* Determine the highest sequence number */
+ if (seq_number >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+ seq_number < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+
+ block_index[n_to_scan].seq = seq_number;
+ block_index[n_to_scan].block = blk;
+
+ n_to_scan++;
+
+ if (seq_number >= dev->seq_number)
+ dev->seq_number = seq_number;
+ } else {
+ /* TODO: Nasty sequence number! */
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ ("Block scanning block %d has bad sequence number %d"
+ TENDSTR), blk, seq_number));
+
+ }
+ }
+ bi++;
+ }
+
+ T(YAFFS_TRACE_SCAN,
+ (TSTR("%d blocks to be sorted..." TENDSTR), n_to_scan));
+
+ YYIELD();
+
+ /* Sort the blocks by sequence number */
+ yaffs_sort(block_index, n_to_scan, sizeof(struct yaffs_block_index),
+ yaffs2_ybicmp);
+
+ YYIELD();
+
+ T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
+
+ /* Now scan the blocks looking at the data. */
+ start_iter = 0;
+ end_iter = n_to_scan - 1;
+ T(YAFFS_TRACE_SCAN_DEBUG,
+ (TSTR("%d blocks to be scanned" TENDSTR), n_to_scan));
+
+ /* For each block.... backwards */
+ for (block_iter = end_iter; !alloc_failed && block_iter >= start_iter;
+ block_iter--) {
+ /* Cooperative multitasking! This loop can run for so
+ long that watchdog timers expire. */
+ YYIELD();
+
+ /* get the block to scan in the correct order */
+ blk = block_index[block_iter].block;
+
+ bi = yaffs_get_block_info(dev, blk);
+
+ state = bi->block_state;
+
+ deleted = 0;
+
+ /* For each chunk in each block that needs scanning.... */
+ found_chunks = 0;
+ for (c = dev->param.chunks_per_block - 1;
+ !alloc_failed && c >= 0 &&
+ (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+ state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
+ /* Scan backwards...
+ * Read the tags and decide what to do
+ */
+
+ chunk = blk * dev->param.chunks_per_block + c;
+
+ result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL,
+ &tags);
+
+ /* Let's have a good look at this chunk... */
+
+ if (!tags.chunk_used) {
+ /* An unassigned chunk in the block.
+ * If there are used chunks after this one, then
+ * it is a chunk that was skipped due to failing the erased
+ * check. Just skip it so that it can be deleted.
+ * But, more typically, We get here when this is an unallocated
+ * chunk and his means that either the block is empty or
+ * this is the one being allocated from
+ */
+
+ if (found_chunks) {
+ /* This is a chunk that was skipped due to failing the erased check */
+ } else if (c == 0) {
+ /* We're looking at the first chunk in the block so the block is unused */
+ state = YAFFS_BLOCK_STATE_EMPTY;
+ dev->n_erased_blocks++;
+ } else {
+ if (state ==
+ YAFFS_BLOCK_STATE_NEEDS_SCANNING
+ || state ==
+ YAFFS_BLOCK_STATE_ALLOCATING) {
+ if (dev->seq_number ==
+ bi->seq_number) {
+ /* this is the block being allocated from */
+
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ (" Allocating from %d %d"
+ TENDSTR), blk, c));
+
+ state =
+ YAFFS_BLOCK_STATE_ALLOCATING;
+ dev->alloc_block = blk;
+ dev->alloc_page = c;
+ dev->
+ alloc_block_finder =
+ blk;
+ } else {
+ /* This is a partially written block that is not
+ * the current allocation block.
+ */
+
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ ("Partially written block %d detected"
+ TENDSTR), blk));
+ }
+ }
+ }
+
+ dev->n_free_chunks++;
+
+ } else if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED) {
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ (" Unfixed ECC in chunk(%d:%d), chunk ignored"
+ TENDSTR), blk, c));
+
+ dev->n_free_chunks++;
+
+ } else if (tags.obj_id > YAFFS_MAX_OBJECT_ID ||
+ tags.chunk_id > YAFFS_MAX_CHUNK_ID ||
+ (tags.chunk_id > 0
+ && tags.n_bytes > dev->data_bytes_per_chunk)
+ || tags.seq_number != bi->seq_number) {
+ T(YAFFS_TRACE_SCAN,
+ (TSTR
+ ("Chunk (%d:%d) with bad tags:obj = %d, chunk_id = %d, n_bytes = %d, ignored"
+ TENDSTR), blk, c, tags.obj_id,
+ tags.chunk_id, tags.n_bytes));
+
+ dev->n_free_chunks++;
+
+ } else if (tags.chunk_id > 0) {
+ /* chunk_id > 0 so it is a data chunk... */
+ unsigned int endpos;
+ u32 chunk_base =
+ (tags.chunk_id -
+ 1) * dev->data_bytes_per_chunk;
+
+ found_chunks = 1;
+
+ yaffs_set_chunk_bit(dev, blk, c);
+ bi->pages_in_use++;
+
+ in = yaffs_find_or_create_by_number(dev,
+ tags.obj_id,
+ YAFFS_OBJECT_TYPE_FILE);
+ if (!in) {
+ /* Out of memory */
+ alloc_failed = 1;
+ }
+
+ if (in &&
+ in->variant_type == YAFFS_OBJECT_TYPE_FILE
+ && chunk_base <
+ in->variant.file_variant.shrink_size) {
+ /* This has not been invalidated by a resize */
+ if (!yaffs_put_chunk_in_file
+ (in, tags.chunk_id, chunk, -1)) {
+ alloc_failed = 1;
+ }
+
+ /* File size is calculated by looking at the data chunks if we have not
+ * seen an object header yet. Stop this practice once we find an object header.
+ */
+ endpos = chunk_base + tags.n_bytes;
+
+ if (!in->valid && /* have not got an object header yet */
+ in->variant.file_variant.
+ scanned_size < endpos) {
+ in->variant.file_variant.
+ scanned_size = endpos;
+ in->variant.file_variant.
+ file_size = endpos;
+ }
+
+ } else if (in) {
+ /* This chunk has been invalidated by a resize, or a past file deletion
+ * so delete the chunk*/
+ yaffs_chunk_del(dev, chunk, 1,
+ __LINE__);
+
+ }
+ } else {
+ /* chunk_id == 0, so it is an ObjectHeader.
+ * Thus, we read in the object header and make the object
+ */
+ found_chunks = 1;
+
+ yaffs_set_chunk_bit(dev, blk, c);
+ bi->pages_in_use++;
+
+ oh = NULL;
+ in = NULL;
+
+ if (tags.extra_available) {
+ in = yaffs_find_or_create_by_number(dev,
+ tags.
+ obj_id,
+ tags.
+ extra_obj_type);
+ if (!in)
+ alloc_failed = 1;
+ }
+
+ if (!in ||
+ (!in->valid && dev->param.disable_lazy_load)
+ || tags.extra_shadows || (!in->valid
+ && (tags.obj_id ==
+ YAFFS_OBJECTID_ROOT
+ || tags.
+ obj_id ==
+ YAFFS_OBJECTID_LOSTNFOUND)))
+ {
+
+ /* If we don't have valid info then we need to read the chunk
+ * TODO In future we can probably defer reading the chunk and
+ * living with invalid data until needed.
+ */
+
+ result = yaffs_rd_chunk_tags_nand(dev,
+ chunk,
+ chunk_data,
+ NULL);
+
+ oh = (struct yaffs_obj_hdr *)chunk_data;
+
+ if (dev->param.inband_tags) {
+ /* Fix up the header if they got corrupted by inband tags */
+ oh->shadows_obj =
+ oh->inband_shadowed_obj_id;
+ oh->is_shrink =
+ oh->inband_is_shrink;
+ }
+
+ if (!in) {
+ in = yaffs_find_or_create_by_number(dev, tags.obj_id, oh->type);
+ if (!in)
+ alloc_failed = 1;
+ }
+
+ }
+
+ if (!in) {
+ /* TODO Hoosterman we have a problem! */
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("yaffs tragedy: Could not make object for object %d at chunk %d during scan"
+ TENDSTR), tags.obj_id, chunk));
+ continue;
+ }
+
+ if (in->valid) {
+ /* We have already filled this one.
+ * We have a duplicate that will be discarded, but
+ * we first have to suck out resize info if it is a file.
+ */
+
+ if ((in->variant_type ==
+ YAFFS_OBJECT_TYPE_FILE) && ((oh
+ &&
+ oh->
+ type
+ ==
+ YAFFS_OBJECT_TYPE_FILE)
+ ||
+ (tags.
+ extra_available
+ &&
+ tags.
+ extra_obj_type
+ ==
+ YAFFS_OBJECT_TYPE_FILE)))
+ {
+ u32 this_size =
+ (oh) ? oh->
+ file_size :
+ tags.extra_length;
+ u32 parent_obj_id =
+ (oh) ? oh->parent_obj_id :
+ tags.extra_parent_id;
+
+ is_shrink =
+ (oh) ? oh->
+ is_shrink :
+ tags.extra_is_shrink;
+
+ /* If it is deleted (unlinked at start also means deleted)
+ * we treat the file size as being zeroed at this point.
+ */
+ if (parent_obj_id ==
+ YAFFS_OBJECTID_DELETED
+ || parent_obj_id ==
+ YAFFS_OBJECTID_UNLINKED) {
+ this_size = 0;
+ is_shrink = 1;
+ }
+
+ if (is_shrink
+ && in->variant.file_variant.
+ shrink_size > this_size)
+ in->variant.
+ file_variant.
+ shrink_size =
+ this_size;
+
+ if (is_shrink)
+ bi->has_shrink_hdr = 1;
+
+ }
+ /* Use existing - destroy this one. */
+ yaffs_chunk_del(dev, chunk, 1,
+ __LINE__);
+
+ }
+
+ if (!in->valid && in->variant_type !=
+ (oh ? oh->type : tags.extra_obj_type))
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("yaffs tragedy: Bad object type, "
+ TCONT
+ ("%d != %d, for object %d at chunk ")
+ TCONT("%d during scan")
+ TENDSTR), oh ?
+ oh->type : tags.extra_obj_type,
+ in->variant_type, tags.obj_id,
+ chunk));
+
+ if (!in->valid &&
+ (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+ tags.obj_id ==
+ YAFFS_OBJECTID_LOSTNFOUND)) {
+ /* We only load some info, don't fiddle with directory structure */
+ in->valid = 1;
+
+ if (oh) {
+
+ in->yst_mode = oh->yst_mode;
+ yaffs_load_attribs(in, oh);
+ in->lazy_loaded = 0;
+ } else {
+ in->lazy_loaded = 1;
+ }
+ in->hdr_chunk = chunk;
+
+ } else if (!in->valid) {
+ /* we need to load this info */
+
+ in->valid = 1;
+ in->hdr_chunk = chunk;
+
+ if (oh) {
+ in->variant_type = oh->type;
+
+ in->yst_mode = oh->yst_mode;
+ yaffs_load_attribs(in, oh);
+
+ if (oh->shadows_obj > 0)
+ yaffs_handle_shadowed_obj
+ (dev,
+ oh->shadows_obj,
+ 1);
+
+ yaffs_set_obj_name_from_oh(in,
+ oh);
+ parent =
+ yaffs_find_or_create_by_number
+ (dev, oh->parent_obj_id,
+ YAFFS_OBJECT_TYPE_DIRECTORY);
+
+ file_size = oh->file_size;
+ is_shrink = oh->is_shrink;
+ equiv_id = oh->equiv_id;
+
+ } else {
+ in->variant_type =
+ tags.extra_obj_type;
+ parent =
+ yaffs_find_or_create_by_number
+ (dev, tags.extra_parent_id,
+ YAFFS_OBJECT_TYPE_DIRECTORY);
+ file_size = tags.extra_length;
+ is_shrink =
+ tags.extra_is_shrink;
+ equiv_id = tags.extra_equiv_id;
+ in->lazy_loaded = 1;
+
+ }
+ in->dirty = 0;
+
+ if (!parent)
+ alloc_failed = 1;
+
+ /* directory stuff...
+ * hook up to parent
+ */
+
+ if (parent && parent->variant_type ==
+ YAFFS_OBJECT_TYPE_UNKNOWN) {
+ /* Set up as a directory */
+ parent->variant_type =
+ YAFFS_OBJECT_TYPE_DIRECTORY;
+ INIT_LIST_HEAD(&parent->
+ variant.dir_variant.children);
+ } else if (!parent
+ || parent->variant_type !=
+ YAFFS_OBJECT_TYPE_DIRECTORY) {
+ /* Hoosterman, another problem....
+ * We're trying to use a non-directory as a directory
+ */
+
+ T(YAFFS_TRACE_ERROR,
+ (TSTR
+ ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+ TENDSTR)));
+ parent = dev->lost_n_found;
+ }
+
+ yaffs_add_obj_to_dir(parent, in);
+
+ is_unlinked = (parent == dev->del_dir)
+ || (parent == dev->unlinked_dir);
+
+ if (is_shrink) {
+ /* Mark the block as having a shrink header */
+ bi->has_shrink_hdr = 1;
+ }
+
+ /* Note re hardlinks.
+ * Since we might scan a hardlink before its equivalent object is scanned
+ * we put them all in a list.
+ * After scanning is complete, we should have all the objects, so we run
+ * through this list and fix up all the chains.
+ */
+
+ switch (in->variant_type) {
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ /* Todo got a problem */
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+
+ if (in->variant.
+ file_variant.scanned_size <
+ file_size) {
+ /* This covers the case where the file size is greater
+ * than where the data is
+ * This will happen if the file is resized to be larger
+ * than its current data extents.
+ */
+ in->variant.
+ file_variant.
+ file_size =
+ file_size;
+ in->variant.
+ file_variant.
+ scanned_size =
+ file_size;
+ }
+
+ if (in->variant.file_variant.
+ shrink_size > file_size)
+ in->variant.
+ file_variant.
+ shrink_size =
+ file_size;
+
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ if (!is_unlinked) {
+ in->variant.
+ hardlink_variant.
+ equiv_id = equiv_id;
+ in->hard_links.next =
+ (struct list_head *)
+ hard_list;
+ hard_list = in;
+ }
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ /* Do nothing */
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ /* Do nothing */
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ if (oh) {
+ in->variant.
+ symlink_variant.
+ alias =
+ yaffs_clone_str(oh->
+ alias);
+ if (!in->variant.
+ symlink_variant.
+ alias)
+ alloc_failed =
+ 1;
+ }
+ break;
+ }
+
+ }
+
+ }
+
+ } /* End of scanning for each chunk */
+
+ if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+ /* If we got this far while scanning, then the block is fully allocated. */
+ state = YAFFS_BLOCK_STATE_FULL;
+ }
+
+ bi->block_state = state;
+
+ /* Now let's see if it was dirty */
+ if (bi->pages_in_use == 0 &&
+ !bi->has_shrink_hdr &&
+ bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+ yaffs_block_became_dirty(dev, blk);
+ }
+
+ }
+
+ yaffs_skip_rest_of_block(dev);
+
+ if (alt_block_index)
+ YFREE_ALT(block_index);
+ else
+ YFREE(block_index);
+
+ /* Ok, we've done all the scanning.
+ * Fix up the hard link chains.
+ * We should now have scanned all the objects, now it's time to add these
+ * hardlinks.
+ */
+ yaffs_link_fixup(dev, hard_list);
+
+ yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
+
+ if (alloc_failed)
+ return YAFFS_FAIL;
+
+ T(YAFFS_TRACE_SCAN, (TSTR("yaffs2_scan_backwards ends" TENDSTR)));
+
+ return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_yaffs2.h b/fs/yaffs2/yaffs_yaffs2.h
new file mode 100644
index 0000000..e1a9287
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.h
@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@...ph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS2_H__
+#define __YAFFS_YAFFS2_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev);
+void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev);
+void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
+ struct yaffs_block_info *bi);
+void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
+ struct yaffs_block_info *bi);
+int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi);
+u32 yaffs2_find_refresh_block(struct yaffs_dev *dev);
+int yaffs2_checkpt_required(struct yaffs_dev *dev);
+int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev);
+
+void yaffs2_checkpt_invalidate(struct yaffs_dev *dev);
+int yaffs2_checkpt_save(struct yaffs_dev *dev);
+int yaffs2_checkpt_restore(struct yaffs_dev *dev);
+
+int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size);
+int yaffs2_scan_backwards(struct yaffs_dev *dev);
+
+#endif
--
1.7.1
--
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