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Message-Id: <1294974369-31647-3-git-send-email-cdhmanning@gmail.com>
Date: Fri, 14 Jan 2011 16:06:01 +1300
From: Charles Manning <cdhmanning@...il.com>
To: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
akpm@...ux-foundation.org
Cc: Charles Manning <cdhmanning@...il.com>
Subject: [PATCH 02/10] Add yaffs2 file system: Attribute and xattrib handling code
Signed-off-by: Charles Manning <cdhmanning@...il.com>
---
fs/yaffs2/yaffs_attribs.c | 124 +++++++++++++++++++++++++++
fs/yaffs2/yaffs_attribs.h | 28 ++++++
fs/yaffs2/yaffs_nameval.c | 204 +++++++++++++++++++++++++++++++++++++++++++++
fs/yaffs2/yaffs_nameval.h | 28 ++++++
4 files changed, 384 insertions(+), 0 deletions(-)
create mode 100644 fs/yaffs2/yaffs_attribs.c
create mode 100644 fs/yaffs2/yaffs_attribs.h
create mode 100644 fs/yaffs2/yaffs_nameval.c
create mode 100644 fs/yaffs2/yaffs_nameval.h
diff --git a/fs/yaffs2/yaffs_attribs.c b/fs/yaffs2/yaffs_attribs.c
new file mode 100644
index 0000000..9b47d37
--- /dev/null
+++ b/fs/yaffs2/yaffs_attribs.c
@@ -0,0 +1,124 @@
+/*
+ * 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_attribs.h"
+
+void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh)
+{
+ obj->yst_uid = oh->yst_uid;
+ obj->yst_gid = oh->yst_gid;
+ obj->yst_atime = oh->yst_atime;
+ obj->yst_mtime = oh->yst_mtime;
+ obj->yst_ctime = oh->yst_ctime;
+ obj->yst_rdev = oh->yst_rdev;
+}
+
+void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
+{
+ oh->yst_uid = obj->yst_uid;
+ oh->yst_gid = obj->yst_gid;
+ oh->yst_atime = obj->yst_atime;
+ oh->yst_mtime = obj->yst_mtime;
+ oh->yst_ctime = obj->yst_ctime;
+ oh->yst_rdev = obj->yst_rdev;
+
+}
+
+void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
+{
+ obj->yst_mtime = Y_CURRENT_TIME;
+ if (do_a)
+ obj->yst_atime = obj->yst_mtime;
+ if (do_c)
+ obj->yst_ctime = obj->yst_mtime;
+}
+
+void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
+{
+ yaffs_load_current_time(obj, 1, 1);
+ obj->yst_rdev = rdev;
+ obj->yst_uid = uid;
+ obj->yst_gid = gid;
+}
+
+loff_t yaffs_get_file_size(struct yaffs_obj *obj)
+{
+ YCHAR *alias = NULL;
+ obj = yaffs_get_equivalent_obj(obj);
+
+ switch (obj->variant_type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ return obj->variant.file_variant.file_size;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ alias = obj->variant.symlink_variant.alias;
+ if (!alias)
+ return 0;
+ return strnlen(alias, YAFFS_MAX_ALIAS_LENGTH);
+ default:
+ return 0;
+ }
+}
+
+int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr)
+{
+ unsigned int valid = attr->ia_valid;
+
+ if (valid & ATTR_MODE)
+ obj->yst_mode = attr->ia_mode;
+ if (valid & ATTR_UID)
+ obj->yst_uid = attr->ia_uid;
+ if (valid & ATTR_GID)
+ obj->yst_gid = attr->ia_gid;
+
+ if (valid & ATTR_ATIME)
+ obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
+ if (valid & ATTR_CTIME)
+ obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
+ if (valid & ATTR_MTIME)
+ obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
+
+ if (valid & ATTR_SIZE)
+ yaffs_resize_file(obj, attr->ia_size);
+
+ yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
+
+ return YAFFS_OK;
+
+}
+
+int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr)
+{
+ unsigned int valid = 0;
+
+ attr->ia_mode = obj->yst_mode;
+ valid |= ATTR_MODE;
+ attr->ia_uid = obj->yst_uid;
+ valid |= ATTR_UID;
+ attr->ia_gid = obj->yst_gid;
+ valid |= ATTR_GID;
+
+ Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
+ valid |= ATTR_ATIME;
+ Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
+ valid |= ATTR_CTIME;
+ Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
+ valid |= ATTR_MTIME;
+
+ attr->ia_size = yaffs_get_file_size(obj);
+ valid |= ATTR_SIZE;
+
+ attr->ia_valid = valid;
+
+ return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_attribs.h b/fs/yaffs2/yaffs_attribs.h
new file mode 100644
index 0000000..33d541d
--- /dev/null
+++ b/fs/yaffs2/yaffs_attribs.h
@@ -0,0 +1,28 @@
+/*
+ * 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_ATTRIBS_H__
+#define __YAFFS_ATTRIBS_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh);
+void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj);
+void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev);
+void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c);
+int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr);
+int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr);
+
+#endif
diff --git a/fs/yaffs2/yaffs_nameval.c b/fs/yaffs2/yaffs_nameval.c
new file mode 100644
index 0000000..18c30b3
--- /dev/null
+++ b/fs/yaffs2/yaffs_nameval.c
@@ -0,0 +1,204 @@
+/*
+ * 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.
+ */
+
+/*
+ * This simple implementation of a name-value store assumes a small number of
+* values and fits into a small finite buffer.
+ *
+ * Each attribute is stored as a record:
+ * sizeof(int) bytes record size.
+ * strnlen+1 bytes name null terminated.
+ * nbytes value.
+ * ----------
+ * total size stored in record size
+ *
+ * This code has not been tested with unicode yet.
+ */
+
+#include "yaffs_nameval.h"
+
+#include "yportenv.h"
+
+static int nval_find(const char *xb, int xb_size, const YCHAR *name,
+ int *exist_size)
+{
+ int pos = 0;
+ int size;
+
+ memcpy(&size, xb, sizeof(int));
+ while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
+ if (strncmp
+ ((YCHAR *) (xb + pos + sizeof(int)), name, size) == 0) {
+ if (exist_size)
+ *exist_size = size;
+ return pos;
+ }
+ pos += size;
+ if (pos < xb_size - sizeof(int))
+ memcpy(&size, xb + pos, sizeof(int));
+ else
+ size = 0;
+ }
+ if (exist_size)
+ *exist_size = 0;
+ return -1;
+}
+
+static int nval_used(const char *xb, int xb_size)
+{
+ int pos = 0;
+ int size;
+
+ memcpy(&size, xb + pos, sizeof(int));
+ while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
+ pos += size;
+ if (pos < xb_size - sizeof(int))
+ memcpy(&size, xb + pos, sizeof(int));
+ else
+ size = 0;
+ }
+ return pos;
+}
+
+int nval_del(char *xb, int xb_size, const YCHAR *name)
+{
+ int pos = nval_find(xb, xb_size, name, NULL);
+ int size;
+
+ if (pos >= 0 && pos < xb_size) {
+ /* Find size, shift rest over this record,
+ * then zero out the rest of buffer */
+ memcpy(&size, xb + pos, sizeof(int));
+ memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
+ memset(xb + (xb_size - size), 0, size);
+ return 0;
+ } else {
+ return -ENODATA;
+ }
+}
+
+int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf,
+ int bsize, int flags)
+{
+ int pos;
+ int namelen = strnlen(name, xb_size);
+ int reclen;
+ int size_exist = 0;
+ int space;
+ int start;
+
+ pos = nval_find(xb, xb_size, name, &size_exist);
+
+ if (flags & XATTR_CREATE && pos >= 0)
+ return -EEXIST;
+ if (flags & XATTR_REPLACE && pos < 0)
+ return -ENODATA;
+
+ start = nval_used(xb, xb_size);
+ space = xb_size - start + size_exist;
+
+ reclen = (sizeof(int) + namelen + 1 + bsize);
+
+ if (reclen > space)
+ return -ENOSPC;
+
+ if (pos >= 0) {
+ nval_del(xb, xb_size, name);
+ start = nval_used(xb, xb_size);
+ }
+
+ pos = start;
+
+ memcpy(xb + pos, &reclen, sizeof(int));
+ pos += sizeof(int);
+ strncpy((YCHAR *) (xb + pos), name, reclen);
+ pos += (namelen + 1);
+ memcpy(xb + pos, buf, bsize);
+ return 0;
+}
+
+int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
+ int bsize)
+{
+ int pos = nval_find(xb, xb_size, name, NULL);
+ int size;
+
+ if (pos >= 0 && pos < xb_size) {
+
+ memcpy(&size, xb + pos, sizeof(int));
+ pos += sizeof(int); /* advance past record length */
+ size -= sizeof(int);
+
+ /* Advance over name string */
+ while (xb[pos] && size > 0 && pos < xb_size) {
+ pos++;
+ size--;
+ }
+ /*Advance over NUL */
+ pos++;
+ size--;
+
+ if (size <= bsize) {
+ memcpy(buf, xb + pos, size);
+ return size;
+ }
+
+ }
+ if (pos >= 0)
+ return -ERANGE;
+ else
+ return -ENODATA;
+}
+
+int nval_list(const char *xb, int xb_size, char *buf, int bsize)
+{
+ int pos = 0;
+ int size;
+ int name_len;
+ int ncopied = 0;
+ int filled = 0;
+
+ memcpy(&size, xb + pos, sizeof(int));
+ while (size > sizeof(int) &&
+ size <= xb_size &&
+ (pos + size) < xb_size &&
+ !filled) {
+ pos += sizeof(int);
+ size -= sizeof(int);
+ name_len = strnlen((YCHAR *) (xb + pos), size);
+ if (ncopied + name_len + 1 < bsize) {
+ memcpy(buf, xb + pos, name_len * sizeof(YCHAR));
+ buf += name_len;
+ *buf = '\0';
+ buf++;
+ if (sizeof(YCHAR) > 1) {
+ *buf = '\0';
+ buf++;
+ }
+ ncopied += (name_len + 1);
+ } else {
+ filled = 1;
+ }
+ pos += size;
+ if (pos < xb_size - sizeof(int))
+ memcpy(&size, xb + pos, sizeof(int));
+ else
+ size = 0;
+ }
+ return ncopied;
+}
+
+int nval_hasvalues(const char *xb, int xb_size)
+{
+ return nval_used(xb, xb_size) > 0;
+}
diff --git a/fs/yaffs2/yaffs_nameval.h b/fs/yaffs2/yaffs_nameval.h
new file mode 100644
index 0000000..2bb02b6
--- /dev/null
+++ b/fs/yaffs2/yaffs_nameval.h
@@ -0,0 +1,28 @@
+/*
+ * 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 __NAMEVAL_H__
+#define __NAMEVAL_H__
+
+#include "yportenv.h"
+
+int nval_del(char *xb, int xb_size, const YCHAR * name);
+int nval_set(char *xb, int xb_size, const YCHAR * name, const char *buf,
+ int bsize, int flags);
+int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
+ int bsize);
+int nval_list(const char *xb, int xb_size, char *buf, int bsize);
+int nval_hasvalues(const char *xb, int xb_size);
+#endif
--
1.7.1
--
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