| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <84bdf20d-6d0e-8075-bf29-651ed946c4bd@harmstone.com>
Date: Fri, 18 Sep 2020 19:32:42 +0100
From: Mark Harmstone <mark@...mstone.com>
To: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
linux-fsdevel@...r.kernel.org
Cc: viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
pali@...nel.org, dsterba@...e.cz, aaptel@...e.com,
willy@...radead.org, rdunlap@...radead.org, joe@...ches.com,
nborisov@...e.com
Subject: Re: [PATCH v6 02/10] fs/ntfs3: Add initialization of super block
Nit-picking a little, but I think S-1-5-7 "Anonymous" would be a better choice
for your default SD's owner and group. It implies then to Windows users that
Linux hasn't tried to do any uid <-> SID mapping.
On 18/9/20 5:21 pm, Konstantin Komarov wrote:
> This adds initialization of super block
>
> Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
> ---
> fs/ntfs3/fsntfs.c | 2201 +++++++++++++++++++++++++++++++++++++
> fs/ntfs3/index.c | 2639 +++++++++++++++++++++++++++++++++++++++++++++
> fs/ntfs3/inode.c | 1998 ++++++++++++++++++++++++++++++++++
> fs/ntfs3/super.c | 1430 ++++++++++++++++++++++++
> 4 files changed, 8268 insertions(+)
> create mode 100644 fs/ntfs3/fsntfs.c
> create mode 100644 fs/ntfs3/index.c
> create mode 100644 fs/ntfs3/inode.c
> create mode 100644 fs/ntfs3/super.c
>
> diff --git a/fs/ntfs3/fsntfs.c b/fs/ntfs3/fsntfs.c
> new file mode 100644
> index 000000000000..1e8fc4cea23a
> --- /dev/null
> +++ b/fs/ntfs3/fsntfs.c
> @@ -0,0 +1,2201 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * linux/fs/ntfs3/fsntfs.c
> + *
> + * Copyright (C) 2019-2020 Paragon Software GmbH, All rights reserved.
> + *
> + */
> +
> +#include <linux/blkdev.h>
> +#include <linux/buffer_head.h>
> +#include <linux/fs.h>
> +#include <linux/nls.h>
> +#include <linux/sched/signal.h>
> +
> +#include "debug.h"
> +#include "ntfs.h"
> +#include "ntfs_fs.h"
> +
> +const struct cpu_str NAME_MFT = { 4, 0, { '$', 'M', 'F', 'T' } };
> +const struct cpu_str NAME_MIRROR = { 8,
> + 0,
> + { '$', 'M', 'F', 'T', 'M', 'i', 'r',
> + 'r' } };
> +const struct cpu_str NAME_LOGFILE = { 8,
> + 0,
> + { '$', 'L', 'o', 'g', 'F', 'i', 'l',
> + 'e' } };
> +const struct cpu_str NAME_VOLUME = { 7,
> + 0,
> + { '$', 'V', 'o', 'l', 'u', 'm', 'e' } };
> +const struct cpu_str NAME_ATTRDEF = { 8,
> + 0,
> + { '$', 'A', 't', 't', 'r', 'D', 'e',
> + 'f' } };
> +const struct cpu_str NAME_ROOT = { 1, 0, { '.' } };
> +const struct cpu_str NAME_BITMAP = { 7,
> + 0,
> + { '$', 'B', 'i', 't', 'm', 'a', 'p' } };
> +const struct cpu_str NAME_BOOT = { 5, 0, { '$', 'B', 'o', 'o', 't' } };
> +const struct cpu_str NAME_BADCLUS = { 8,
> + 0,
> + { '$', 'B', 'a', 'd', 'C', 'l', 'u',
> + 's' } };
> +const struct cpu_str NAME_QUOTA = { 6, 0, { '$', 'Q', 'u', 'o', 't', 'a' } };
> +const struct cpu_str NAME_SECURE = { 7,
> + 0,
> + { '$', 'S', 'e', 'c', 'u', 'r', 'e' } };
> +const struct cpu_str NAME_UPCASE = { 7,
> + 0,
> + { '$', 'U', 'p', 'C', 'a', 's', 'e' } };
> +const struct cpu_str NAME_EXTEND = { 7,
> + 0,
> + { '$', 'E', 'x', 't', 'e', 'n', 'd' } };
> +const struct cpu_str NAME_OBJID = { 6, 0, { '$', 'O', 'b', 'j', 'I', 'd' } };
> +const struct cpu_str NAME_REPARSE = { 8,
> + 0,
> + { '$', 'R', 'e', 'p', 'a', 'r', 's',
> + 'e' } };
> +const struct cpu_str NAME_USNJRNL = { 8,
> + 0,
> + { '$', 'U', 's', 'n', 'J', 'r', 'n',
> + 'l' } };
> +const __le16 BAD_NAME[4] = { cpu_to_le16('$'), cpu_to_le16('B'),
> + cpu_to_le16('a'), cpu_to_le16('d') };
> +const __le16 I30_NAME[4] = { cpu_to_le16('$'), cpu_to_le16('I'),
> + cpu_to_le16('3'), cpu_to_le16('0') };
> +const __le16 SII_NAME[4] = { cpu_to_le16('$'), cpu_to_le16('S'),
> + cpu_to_le16('I'), cpu_to_le16('I') };
> +const __le16 SDH_NAME[4] = { cpu_to_le16('$'), cpu_to_le16('S'),
> + cpu_to_le16('D'), cpu_to_le16('H') };
> +const __le16 SDS_NAME[4] = { cpu_to_le16('$'), cpu_to_le16('S'),
> + cpu_to_le16('D'), cpu_to_le16('S') };
> +const __le16 SO_NAME[2] = { cpu_to_le16('$'), cpu_to_le16('O') };
> +const __le16 SQ_NAME[2] = { cpu_to_le16('$'), cpu_to_le16('Q') };
> +const __le16 SR_NAME[2] = { cpu_to_le16('$'), cpu_to_le16('R') };
> +//const __le16 EFS_NAME[4] = { '$', 'E', 'F', 'S' };
> +
> +//const __le16 WOF_NAME[17] = { 'W', 'o', 'f', 'C', 'o', 'm', 'p', 'r', 'e',
> +// 'S', 'S', 'e', 'd', 'D', 'a', 't', 'a' };
> +//const __le16 J_NAME[2] = { '$', 'J' };
> +//const __le16 MAX_NAME[4] = { '$', 'M', 'a', 'x' };
> +
> +/*
> + * ntfs_fix_pre_write
> + *
> + * inserts fixups into 'rhdr' before writing to disk
> + */
> +bool ntfs_fix_pre_write(struct NTFS_RECORD_HEADER *rhdr, size_t bytes)
> +{
> + u16 *fixup, *ptr;
> + u16 sample;
> + u16 fo = le16_to_cpu(rhdr->fix_off);
> + u16 fn = le16_to_cpu(rhdr->fix_num);
> +
> + if ((fo & 1) || fo + fn * sizeof(short) > SECTOR_SIZE || !fn-- ||
> + fn * SECTOR_SIZE > bytes) {
> + return false;
> + }
> +
> + /* Get fixup pointer */
> + fixup = Add2Ptr(rhdr, fo);
> +
> + if (*fixup >= 0x7FFF)
> + *fixup = 1;
> + else
> + *fixup += 1;
> +
> + sample = *fixup;
> +
> + ptr = Add2Ptr(rhdr, SECTOR_SIZE - sizeof(short));
> +
> + while (fn--) {
> + *++fixup = *ptr;
> + *ptr = sample;
> + ptr += SECTOR_SIZE / sizeof(short);
> + }
> + return true;
> +}
> +
> +/*
> + * ntfs_fix_post_read
> + *
> + * remove fixups after reading from disk
> + * Returns < 0 if error, 0 if ok, 1 if need to update fixups
> + */
> +int ntfs_fix_post_read(struct NTFS_RECORD_HEADER *rhdr, size_t bytes,
> + bool simple)
> +{
> + int ret;
> + u16 *fixup, *ptr;
> + u16 sample, fo, fn;
> +
> + fo = le16_to_cpu(rhdr->fix_off);
> + fn = simple ? ((bytes >> SECTOR_SHIFT) + 1) :
> + le16_to_cpu(rhdr->fix_num);
> +
> + /* Check errors */
> + if ((fo & 1) || fo + fn * sizeof(short) > SECTOR_SIZE || !fn-- ||
> + fn * SECTOR_SIZE > bytes) {
> + return -EINVAL; /* native chkntfs returns ok! */
> + }
> +
> + /* Get fixup pointer */
> + fixup = Add2Ptr(rhdr, fo);
> + sample = *fixup;
> + ptr = Add2Ptr(rhdr, SECTOR_SIZE - sizeof(short));
> + ret = 0;
> +
> + while (fn--) {
> + /* Test current word */
> + if (*ptr != sample)
> + ret = 1;
> +
> + /* Replace fixup */
> + *ptr = *++fixup;
> + ptr += SECTOR_SIZE / sizeof(short);
> + }
> +
> + return ret;
> +}
> +
> +/*
> + * ntfs_extend_init
> + *
> + * loads $Extend file
> + */
> +int ntfs_extend_init(struct ntfs_sb_info *sbi)
> +{
> + int err;
> + struct super_block *sb = sbi->sb;
> + struct inode *inode, *inode2;
> + struct MFT_REF ref;
> +
> + if (sbi->volume.major_ver < 3) {
> + ntfs_notice(sb, "Skip $Extend 'cause NTFS version");
> + return 0;
> + }
> +
> + ref.low = cpu_to_le32(MFT_REC_EXTEND);
> + ref.high = 0;
> + ref.seq = cpu_to_le16(MFT_REC_EXTEND);
> + inode = ntfs_iget5(sb, &ref, &NAME_EXTEND);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + ntfs_err(sb, "Failed to load $Extend.");
> + inode = NULL;
> + goto out;
> + }
> +
> + /* if ntfs_iget5 reads from disk it never returns bad inode */
> + if (!S_ISDIR(inode->i_mode)) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + /* Try to find $ObjId */
> + inode2 = dir_search_u(inode, &NAME_OBJID, NULL);
> + if (inode2 && !IS_ERR(inode2)) {
> + if (is_bad_inode(inode2)) {
> + iput(inode2);
> + } else {
> + sbi->objid.ni = ntfs_i(inode2);
> + sbi->objid_no = inode2->i_ino;
> + }
> + }
> +
> + /* Try to find $Quota */
> + inode2 = dir_search_u(inode, &NAME_QUOTA, NULL);
> + if (inode2 && !IS_ERR(inode2)) {
> + sbi->quota_no = inode2->i_ino;
> + iput(inode2);
> + }
> +
> + /* Try to find $Reparse */
> + inode2 = dir_search_u(inode, &NAME_REPARSE, NULL);
> + if (inode2 && !IS_ERR(inode2)) {
> + sbi->reparse.ni = ntfs_i(inode2);
> + sbi->reparse_no = inode2->i_ino;
> + }
> +
> + /* Try to find $UsnJrnl */
> + inode2 = dir_search_u(inode, &NAME_USNJRNL, NULL);
> + if (inode2 && !IS_ERR(inode2)) {
> + sbi->usn_jrnl_no = inode2->i_ino;
> + iput(inode2);
> + }
> +
> + err = 0;
> +out:
> + iput(inode);
> + return err;
> +}
> +
> +int ntfs_loadlog_and_replay(struct ntfs_inode *ni, struct ntfs_sb_info *sbi)
> +{
> + int err = 0;
> + struct super_block *sb = sbi->sb;
> + struct inode *inode;
> + struct MFT_REF ref;
> + u32 idx;
> + CLST lcn, len;
> +
> + inode = &ni->vfs_inode;
> +
> + /* Check for 4GB */
> + if (inode->i_size >= 0x100000000ull) {
> + ntfs_err(sb, "$LogFile is too big");
> + err = -EINVAL;
> + goto out;
> + }
> +
> + sbi->flags |= NTFS_FLAGS_LOG_REPLAYING;
> +
> + ref.low = cpu_to_le32(MFT_REC_MFT);
> + ref.high = 0;
> + ref.seq = cpu_to_le16(1);
> +
> + inode = ntfs_iget5(sb, &ref, NULL);
> +
> + if (IS_ERR(inode))
> + inode = NULL;
> +
> + if (!inode) {
> + /* Try to use mft copy */
> + u64 t64 = sbi->mft.lbo;
> +
> + sbi->mft.lbo = sbi->mft.lbo2;
> + inode = ntfs_iget5(sb, &ref, NULL);
> + sbi->mft.lbo = t64;
> + if (IS_ERR(inode))
> + inode = NULL;
> + }
> +
> + if (!inode) {
> + err = -EINVAL;
> + ntfs_err(sb, "Failed to load $MFT.");
> + goto out;
> + }
> +
> + sbi->mft.ni = ntfs_i(inode);
> +
> + err = ni_load_all_mi(sbi->mft.ni);
> + if (!err)
> + err = log_replay(ni);
> +
> + iput(inode);
> + sbi->mft.ni = NULL;
> +
> + sync_blockdev(sb->s_bdev);
> + invalidate_bdev(sb->s_bdev);
> +
> + /* reinit MFT */
> + if (sbi->flags & NTFS_FLAGS_NEED_REPLAY) {
> + err = 0;
> + goto out;
> + }
> +
> + if (sb_rdonly(sb))
> + goto out;
> +
> + idx = 0;
> + while (run_get_entry(&ni->file.run, idx++, NULL, &lcn, &len)) {
> + u64 lbo = (u64)lcn << sbi->cluster_bits;
> + u64 bytes = (u64)len << sbi->cluster_bits;
> +
> + err = ntfs_sb_write(sb, lbo, bytes, NULL, 0);
> + if (err)
> + goto out;
> + }
> +
> +out:
> + sbi->flags &= ~NTFS_FLAGS_LOG_REPLAYING;
> +
> + return err;
> +}
> +
> +/*
> + * ntfs_query_def
> + *
> + * returns current ATTR_DEF_ENTRY for given attribute type
> + */
> +const struct ATTR_DEF_ENTRY *ntfs_query_def(struct ntfs_sb_info *sbi,
> + enum ATTR_TYPE type)
> +{
> + int type_in = le32_to_cpu(type);
> + size_t min_idx = 0;
> + size_t max_idx = sbi->def_entries - 1;
> +
> + while (min_idx <= max_idx) {
> + size_t i = min_idx + ((max_idx - min_idx) >> 1);
> + const struct ATTR_DEF_ENTRY *entry = sbi->def_table + i;
> + int diff = le32_to_cpu(entry->type) - type_in;
> +
> + if (!diff)
> + return entry;
> + if (diff < 0)
> + min_idx = i + 1;
> + else if (i)
> + max_idx = i - 1;
> + else
> + return NULL;
> + }
> + return NULL;
> +}
> +
> +/*
> + * ntfs_look_for_free_space
> + *
> + * looks for a free space in bitmap
> + */
> +int ntfs_look_for_free_space(struct ntfs_sb_info *sbi, CLST lcn, CLST len,
> + CLST *new_lcn, CLST *new_len,
> + enum ALLOCATE_OPT opt)
> +{
> + int err;
> + struct super_block *sb = sbi->sb;
> + size_t a_lcn, zlen, zeroes, zlcn, zlen2, ztrim, new_zlen;
> + struct wnd_bitmap *wnd = &sbi->used.bitmap;
> +
> + down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_CLUSTERS);
> + if (opt & ALLOCATE_MFT) {
> + CLST alen;
> +
> + zlen = wnd_zone_len(wnd);
> +
> + if (!zlen) {
> + err = ntfs_refresh_zone(sbi);
> + if (err)
> + goto out;
> +
> + zlen = wnd_zone_len(wnd);
> +
> + if (!zlen) {
> + ntfs_err(sbi->sb,
> + "no free space to extend mft");
> + err = -ENOSPC;
> + goto out;
> + }
> + }
> +
> + lcn = wnd_zone_bit(wnd);
> + alen = zlen > len ? len : zlen;
> +
> + wnd_zone_set(wnd, lcn + alen, zlen - alen);
> +
> + err = wnd_set_used(wnd, lcn, alen);
> + if (err)
> + goto out;
> +
> + *new_lcn = lcn;
> + *new_len = alen;
> + goto ok;
> + }
> +
> + /*
> + * 'Cause cluster 0 is always used this value means that we should use
> + * cached value of 'next_free_lcn' to improve performance
> + */
> + if (!lcn)
> + lcn = sbi->used.next_free_lcn;
> +
> + if (lcn >= wnd->nbits)
> + lcn = 0;
> +
> + *new_len = wnd_find(wnd, len, lcn, BITMAP_FIND_MARK_AS_USED, &a_lcn);
> + if (*new_len) {
> + *new_lcn = a_lcn;
> + goto ok;
> + }
> +
> + /* Try to use clusters from MftZone */
> + zlen = wnd_zone_len(wnd);
> + zeroes = wnd_zeroes(wnd);
> +
> + /* Check too big request */
> + if (len > zeroes + zlen)
> + goto no_space;
> +
> + if (zlen <= NTFS_MIN_MFT_ZONE)
> + goto no_space;
> +
> + /* How many clusters to cat from zone */
> + zlcn = wnd_zone_bit(wnd);
> + zlen2 = zlen >> 1;
> + ztrim = len > zlen ? zlen : (len > zlen2 ? len : zlen2);
> + new_zlen = zlen - ztrim;
> +
> + if (new_zlen < NTFS_MIN_MFT_ZONE) {
> + new_zlen = NTFS_MIN_MFT_ZONE;
> + if (new_zlen > zlen)
> + new_zlen = zlen;
> + }
> +
> + wnd_zone_set(wnd, zlcn, new_zlen);
> +
> + /* allocate continues clusters */
> + *new_len =
> + wnd_find(wnd, len, 0,
> + BITMAP_FIND_MARK_AS_USED | BITMAP_FIND_FULL, &a_lcn);
> + if (*new_len) {
> + *new_lcn = a_lcn;
> + goto ok;
> + }
> +
> +no_space:
> + up_write(&wnd->rw_lock);
> +
> + return -ENOSPC;
> +
> +ok:
> + err = 0;
> +
> + ntfs_unmap_meta(sb, *new_lcn, *new_len);
> +
> + if (opt & ALLOCATE_MFT)
> + goto out;
> +
> + /* Set hint for next requests */
> + sbi->used.next_free_lcn = *new_lcn + *new_len;
> +
> +out:
> + up_write(&wnd->rw_lock);
> + return err;
> +}
> +
> +/*
> + * ntfs_extend_mft
> + *
> + * allocates additional MFT records
> + * sbi->mft.bitmap is locked for write
> + *
> + * NOTE: recursive:
> + * ntfs_look_free_mft ->
> + * ntfs_extend_mft ->
> + * attr_set_size ->
> + * ni_insert_nonresident ->
> + * ni_insert_attr ->
> + * ni_ins_attr_ext ->
> + * ntfs_look_free_mft ->
> + * ntfs_extend_mft
> + * To avoid recursive always allocate space for two new mft records
> + * see attrib.c: "at least two mft to avoid recursive loop"
> + */
> +static int ntfs_extend_mft(struct ntfs_sb_info *sbi)
> +{
> + int err;
> + struct ntfs_inode *ni = sbi->mft.ni;
> + size_t new_mft_total;
> + u64 new_mft_bytes, new_bitmap_bytes;
> + struct ATTRIB *attr;
> + struct wnd_bitmap *wnd = &sbi->mft.bitmap;
> +
> + new_mft_total = (wnd->nbits + MFT_INCREASE_CHUNK + 127) & (CLST)~127;
> + new_mft_bytes = (u64)new_mft_total << sbi->record_bits;
> +
> + /* Step 1: Resize $MFT::DATA */
> + down_write(&ni->file.run_lock);
> + err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run,
> + new_mft_bytes, NULL, false, &attr);
> +
> + if (err) {
> + up_write(&ni->file.run_lock);
> + goto out;
> + }
> +
> + attr->nres.valid_size = attr->nres.data_size;
> + new_mft_total = le64_to_cpu(attr->nres.alloc_size) >> sbi->record_bits;
> + ni->mi.dirty = true;
> +
> + /* Step 2: Resize $MFT::BITMAP */
> + new_bitmap_bytes = bitmap_size(new_mft_total);
> +
> + err = attr_set_size(ni, ATTR_BITMAP, NULL, 0, &sbi->mft.bitmap.run,
> + new_bitmap_bytes, &new_bitmap_bytes, true, NULL);
> +
> + /* Refresh Mft Zone if necessary */
> + down_write_nested(&sbi->used.bitmap.rw_lock, BITMAP_MUTEX_CLUSTERS);
> +
> + ntfs_refresh_zone(sbi);
> +
> + up_write(&sbi->used.bitmap.rw_lock);
> + up_write(&ni->file.run_lock);
> +
> + if (err)
> + goto out;
> +
> + err = wnd_extend(wnd, new_mft_total);
> +
> + if (err)
> + goto out;
> +
> + ntfs_clear_mft_tail(sbi, sbi->mft.used, new_mft_total);
> +
> + err = _ni_write_inode(&ni->vfs_inode, 0);
> +out:
> + return err;
> +}
> +
> +/*
> + * ntfs_look_free_mft
> + *
> + * looks for a free MFT record
> + */
> +int ntfs_look_free_mft(struct ntfs_sb_info *sbi, CLST *rno, bool mft,
> + struct ntfs_inode *ni, struct mft_inode **mi)
> +{
> + int err = 0;
> + size_t zbit, zlen, from, to, fr;
> + size_t mft_total;
> + struct MFT_REF ref;
> + struct super_block *sb = sbi->sb;
> + struct wnd_bitmap *wnd = &sbi->mft.bitmap;
> + u32 ir;
> +
> + static_assert(sizeof(sbi->mft.reserved_bitmap) * 8 >=
> + MFT_REC_FREE - MFT_REC_RESERVED);
> +
> + if (!mft)
> + down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_MFT);
> +
> + zlen = wnd_zone_len(wnd);
> +
> + /* Always reserve space for MFT */
> + if (zlen) {
> + if (mft) {
> + zbit = wnd_zone_bit(wnd);
> + *rno = zbit;
> + wnd_zone_set(wnd, zbit + 1, zlen - 1);
> + }
> + goto found;
> + }
> +
> + /* No MFT zone. find the nearest to '0' free MFT */
> + if (!wnd_find(wnd, 1, MFT_REC_FREE, 0, &zbit)) {
> + /* Resize MFT */
> + mft_total = wnd->nbits;
> +
> + err = ntfs_extend_mft(sbi);
> + if (!err) {
> + zbit = mft_total;
> + goto reserve_mft;
> + }
> +
> + if (!mft || MFT_REC_FREE == sbi->mft.next_reserved)
> + goto out;
> +
> + err = 0;
> +
> + /*
> + * Look for free record reserved area [11-16) ==
> + * [MFT_REC_RESERVED, MFT_REC_FREE ) MFT bitmap always
> + * marks it as used
> + */
> + if (!sbi->mft.reserved_bitmap) {
> + /* Once per session create internal bitmap for 5 bits */
> + sbi->mft.reserved_bitmap = 0xFF;
> +
> + ref.high = 0;
> + for (ir = MFT_REC_RESERVED; ir < MFT_REC_FREE; ir++) {
> + struct inode *i;
> + struct ntfs_inode *ni;
> + struct MFT_REC *mrec;
> +
> + ref.low = cpu_to_le32(ir);
> + ref.seq = cpu_to_le16(ir);
> +
> + i = ntfs_iget5(sb, &ref, NULL);
> + if (IS_ERR(i)) {
> +next:
> + ntfs_notice(
> + sb,
> + "Invalid reserved record %x",
> + ref.low);
> + continue;
> + }
> + if (is_bad_inode(i)) {
> + iput(i);
> + goto next;
> + }
> +
> + ni = ntfs_i(i);
> +
> + mrec = ni->mi.mrec;
> +
> + if (!is_rec_base(mrec))
> + goto next;
> +
> + if (mrec->hard_links)
> + goto next;
> +
> + if (!ni_std(ni))
> + goto next;
> +
> + if (ni_find_attr(ni, NULL, NULL, ATTR_NAME,
> + NULL, 0, NULL, NULL))
> + goto next;
> +
> + __clear_bit(ir - MFT_REC_RESERVED,
> + &sbi->mft.reserved_bitmap);
> + }
> + }
> +
> + /* Scan 5 bits for zero. Bit 0 == MFT_REC_RESERVED */
> + zbit = find_next_zero_bit(&sbi->mft.reserved_bitmap,
> + MFT_REC_FREE, MFT_REC_RESERVED);
> + if (zbit >= MFT_REC_FREE) {
> + sbi->mft.next_reserved = MFT_REC_FREE;
> + goto out;
> + }
> +
> + zlen = 1;
> + sbi->mft.next_reserved = zbit;
> + } else {
> +reserve_mft:
> + zlen = zbit == MFT_REC_FREE ? (MFT_REC_USER - MFT_REC_FREE) : 4;
> + if (zbit + zlen > wnd->nbits)
> + zlen = wnd->nbits - zbit;
> +
> + while (zlen > 1 && !wnd_is_free(wnd, zbit, zlen))
> + zlen -= 1;
> +
> + /* [zbit, zbit + zlen) will be used for Mft itself */
> + from = sbi->mft.used;
> + if (from < zbit)
> + from = zbit;
> + to = zbit + zlen;
> + if (from < to) {
> + ntfs_clear_mft_tail(sbi, from, to);
> + sbi->mft.used = to;
> + }
> + }
> +
> + if (mft) {
> + *rno = zbit;
> + zbit += 1;
> + zlen -= 1;
> + }
> +
> + wnd_zone_set(wnd, zbit, zlen);
> +
> +found:
> + if (!mft) {
> + /* The request to get record for general purpose */
> + if (sbi->mft.next_free < MFT_REC_USER)
> + sbi->mft.next_free = MFT_REC_USER;
> +
> + for (;;) {
> + if (sbi->mft.next_free >= sbi->mft.bitmap.nbits) {
> + } else if (!wnd_find(wnd, 1, MFT_REC_USER, 0, &fr)) {
> + sbi->mft.next_free = sbi->mft.bitmap.nbits;
> + } else {
> + *rno = fr;
> + sbi->mft.next_free = *rno + 1;
> + break;
> + }
> +
> + err = ntfs_extend_mft(sbi);
> + if (err)
> + goto out;
> + }
> + }
> +
> + if (ni && !ni_add_subrecord(ni, *rno, mi)) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + /* We have found a record that are not reserved for next MFT */
> + if (*rno >= MFT_REC_FREE)
> + wnd_set_used(wnd, *rno, 1);
> + else if (*rno >= MFT_REC_RESERVED && sbi->mft.reserved_bitmap_inited)
> + __set_bit(*rno - MFT_REC_RESERVED, &sbi->mft.reserved_bitmap);
> +
> +out:
> + if (!mft)
> + up_write(&wnd->rw_lock);
> +
> + return err;
> +}
> +
> +/*
> + * ntfs_mark_rec_free
> + *
> + * marks record as free
> + */
> +void ntfs_mark_rec_free(struct ntfs_sb_info *sbi, CLST rno)
> +{
> + struct wnd_bitmap *wnd = &sbi->mft.bitmap;
> +
> + down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_MFT);
> + if (rno >= wnd->nbits)
> + goto out;
> +
> + if (rno >= MFT_REC_FREE) {
> + if (!wnd_is_used(wnd, rno, 1))
> + ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
> + else
> + wnd_set_free(wnd, rno, 1);
> + } else if (rno >= MFT_REC_RESERVED && sbi->mft.reserved_bitmap_inited) {
> + __clear_bit(rno - MFT_REC_RESERVED, &sbi->mft.reserved_bitmap);
> + }
> +
> + if (rno < wnd_zone_bit(wnd))
> + wnd_zone_set(wnd, rno, 1);
> + else if (rno < sbi->mft.next_free && rno >= MFT_REC_USER)
> + sbi->mft.next_free = rno;
> +
> +out:
> + up_write(&wnd->rw_lock);
> +}
> +
> +/*
> + * ntfs_clear_mft_tail
> + *
> + * formats empty records [from, to)
> + * sbi->mft.bitmap is locked for write
> + */
> +int ntfs_clear_mft_tail(struct ntfs_sb_info *sbi, size_t from, size_t to)
> +{
> + int err;
> + u32 rs;
> + u64 vbo;
> + struct runs_tree *run;
> + struct ntfs_inode *ni;
> +
> + if (from >= to)
> + return 0;
> +
> + rs = sbi->record_size;
> + ni = sbi->mft.ni;
> + run = &ni->file.run;
> +
> + down_read(&ni->file.run_lock);
> + vbo = (u64)from * rs;
> + for (; from < to; from++, vbo += rs) {
> + struct ntfs_buffers nb;
> +
> + err = ntfs_get_bh(sbi, run, vbo, rs, &nb);
> + if (err)
> + goto out;
> +
> + err = ntfs_write_bh(sbi, &sbi->new_rec->rhdr, &nb, 0);
> + nb_put(&nb);
> + if (err)
> + goto out;
> + }
> +
> +out:
> + sbi->mft.used = from;
> + up_read(&ni->file.run_lock);
> + return err;
> +}
> +
> +/*
> + * ntfs_refresh_zone
> + *
> + * refreshes Mft zone
> + * sbi->used.bitmap is locked for rw
> + * sbi->mft.bitmap is locked for write
> + * sbi->mft.ni->file.run_lock for write
> + */
> +int ntfs_refresh_zone(struct ntfs_sb_info *sbi)
> +{
> + CLST zone_limit, zone_max, lcn, vcn, len;
> + size_t lcn_s, zlen;
> + struct wnd_bitmap *wnd = &sbi->used.bitmap;
> + struct ntfs_inode *ni = sbi->mft.ni;
> +
> + /* Do not change anything unless we have non empty Mft zone */
> + if (wnd_zone_len(wnd))
> + return 0;
> +
> + /*
> + * Compute the mft zone at two steps
> + * It would be nice if we are able to allocate
> + * 1/8 of total clusters for MFT but not more then 512 MB
> + */
> + zone_limit = (512 * 1024 * 1024) >> sbi->cluster_bits;
> + zone_max = wnd->nbits >> 3;
> + if (zone_max > zone_limit)
> + zone_max = zone_limit;
> +
> + vcn = bytes_to_cluster(sbi,
> + (u64)sbi->mft.bitmap.nbits << sbi->record_bits);
> +
> + if (!run_lookup_entry(&ni->file.run, vcn - 1, &lcn, &len, NULL))
> + lcn = SPARSE_LCN;
> +
> + /* We should always find Last Lcn for MFT */
> + if (lcn == SPARSE_LCN)
> + return -EINVAL;
> +
> + lcn_s = lcn + 1;
> +
> + /* Try to allocate clusters after last MFT run */
> + zlen = wnd_find(wnd, zone_max, lcn_s, 0, &lcn_s);
> + if (!zlen) {
> + ntfs_notice(sbi->sb, "MftZone: unavailable");
> + return 0;
> + }
> +
> + /* Truncate too large zone */
> + wnd_zone_set(wnd, lcn_s, zlen);
> +
> + return 0;
> +}
> +
> +/*
> + * ntfs_update_mftmirr
> + *
> + * updates $MFTMirr data
> + */
> +int ntfs_update_mftmirr(struct ntfs_sb_info *sbi, int wait)
> +{
> + int err;
> + struct super_block *sb = sbi->sb;
> + u32 blocksize = sb->s_blocksize;
> + sector_t block1, block2;
> + u32 bytes;
> +
> + if (!(sbi->flags & NTFS_FLAGS_MFTMIRR))
> + return 0;
> +
> + err = 0;
> + bytes = sbi->mft.recs_mirr << sbi->record_bits;
> + block1 = sbi->mft.lbo >> sb->s_blocksize_bits;
> + block2 = sbi->mft.lbo2 >> sb->s_blocksize_bits;
> +
> + for (; bytes >= blocksize; bytes -= blocksize) {
> + struct buffer_head *bh1, *bh2;
> +
> + bh1 = sb_bread(sb, block1++);
> + if (!bh1) {
> + err = -EIO;
> + goto out;
> + }
> +
> + bh2 = sb_getblk(sb, block2++);
> + if (!bh2) {
> + put_bh(bh1);
> + err = -EIO;
> + goto out;
> + }
> +
> + if (buffer_locked(bh2))
> + __wait_on_buffer(bh2);
> +
> + lock_buffer(bh2);
> + memcpy(bh2->b_data, bh1->b_data, blocksize);
> + set_buffer_uptodate(bh2);
> + mark_buffer_dirty(bh2);
> + unlock_buffer(bh2);
> +
> + put_bh(bh1);
> + bh1 = NULL;
> +
> + if (wait)
> + err = sync_dirty_buffer(bh2);
> +
> + put_bh(bh2);
> + if (err)
> + goto out;
> + }
> +
> + sbi->flags &= ~NTFS_FLAGS_MFTMIRR;
> +
> +out:
> + return err;
> +}
> +
> +/*
> + * ntfs_set_state
> + *
> + * mount: ntfs_set_state(NTFS_DIRTY_DIRTY)
> + * umount: ntfs_set_state(NTFS_DIRTY_CLEAR)
> + * ntfs error: ntfs_set_state(NTFS_DIRTY_ERROR)
> + */
> +int ntfs_set_state(struct ntfs_sb_info *sbi, enum NTFS_DIRTY_FLAGS dirty)
> +{
> + int err;
> + struct ATTRIB *attr;
> + struct VOLUME_INFO *info;
> + struct mft_inode *mi;
> + struct ntfs_inode *ni;
> +
> + /*
> + * do not change state if fs was real_dirty
> + * do not change state if fs already dirty(clear)
> + * do not change any thing if mounted read only
> + */
> + if (sbi->volume.real_dirty || sb_rdonly(sbi->sb))
> + return 0;
> +
> + /* Check cached value */
> + if ((dirty == NTFS_DIRTY_CLEAR ? 0 : VOLUME_FLAG_DIRTY) ==
> + (sbi->volume.flags & VOLUME_FLAG_DIRTY))
> + return 0;
> +
> + ni = sbi->volume.ni;
> + if (!ni)
> + return -EINVAL;
> +
> + inode_lock(&ni->vfs_inode);
> +
> + attr = ni_find_attr(ni, NULL, NULL, ATTR_VOL_INFO, NULL, 0, NULL, &mi);
> + if (!attr) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO);
> + if (!info) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + switch (dirty) {
> + case NTFS_DIRTY_ERROR:
> + ntfs_notice(sbi->sb, "Mark volume as dirty due to NTFS errors");
> + sbi->volume.real_dirty = true;
> + fallthrough;
> + case NTFS_DIRTY_DIRTY:
> + info->flags |= VOLUME_FLAG_DIRTY;
> + break;
> + case NTFS_DIRTY_CLEAR:
> + info->flags &= ~VOLUME_FLAG_DIRTY;
> + break;
> + }
> + /* cache current volume flags*/
> + sbi->volume.flags = info->flags;
> + mi->dirty = true;
> + err = 0;
> +
> +out:
> + inode_unlock(&ni->vfs_inode);
> + if (err)
> + return err;
> +
> + mark_inode_dirty(&ni->vfs_inode);
> + /*verify(!ntfs_update_mftmirr()); */
> + err = sync_inode_metadata(&ni->vfs_inode, 1);
> +
> + return err;
> +}
> +
> +/*
> + * security_hash
> + *
> + * calculates a hash of security descriptor
> + */
> +static inline __le32 security_hash(const void *sd, size_t bytes)
> +{
> + u32 hash = 0;
> + const __le32 *ptr = sd;
> +
> + bytes >>= 2;
> + while (bytes--)
> + hash = ((hash >> 0x1D) | (hash << 3)) + le32_to_cpu(*ptr++);
> + return cpu_to_le32(hash);
> +}
> +
> +int ntfs_sb_read(struct super_block *sb, u64 lbo, size_t bytes, void *buffer)
> +{
> + struct block_device *bdev = sb->s_bdev;
> + u32 blocksize = sb->s_blocksize;
> + u64 block = lbo >> sb->s_blocksize_bits;
> + u32 off = lbo & (blocksize - 1);
> + u32 op = blocksize - off;
> +
> + for (; bytes; block += 1, off = 0, op = blocksize) {
> + struct buffer_head *bh = __bread(bdev, block, blocksize);
> +
> + if (!bh)
> + return -EIO;
> +
> + if (op > bytes)
> + op = bytes;
> +
> + memcpy(buffer, bh->b_data + off, op);
> +
> + put_bh(bh);
> +
> + bytes -= op;
> + buffer = Add2Ptr(buffer, op);
> + }
> +
> + return 0;
> +}
> +
> +int ntfs_sb_write(struct super_block *sb, u64 lbo, size_t bytes,
> + const void *buf, int wait)
> +{
> + u32 blocksize = sb->s_blocksize;
> + struct block_device *bdev = sb->s_bdev;
> + sector_t block = lbo >> sb->s_blocksize_bits;
> + u32 off = lbo & (blocksize - 1);
> + u32 op = blocksize - off;
> + struct buffer_head *bh;
> +
> + if (!wait && (sb->s_flags & SB_SYNCHRONOUS))
> + wait = 1;
> +
> + for (; bytes; block += 1, off = 0, op = blocksize) {
> + if (op > bytes)
> + op = bytes;
> +
> + if (op < blocksize) {
> + bh = __bread(bdev, block, blocksize);
> + if (!bh) {
> + ntfs_err(sb, "failed to read block %llx",
> + (u64)block);
> + return -EIO;
> + }
> + } else {
> + bh = __getblk(bdev, block, blocksize);
> + if (!bh)
> + return -ENOMEM;
> + }
> +
> + if (buffer_locked(bh))
> + __wait_on_buffer(bh);
> +
> + lock_buffer(bh);
> + if (buf) {
> + memcpy(bh->b_data + off, buf, op);
> + buf = Add2Ptr(buf, op);
> + } else {
> + memset(bh->b_data + off, -1, op);
> + }
> +
> + set_buffer_uptodate(bh);
> + mark_buffer_dirty(bh);
> + unlock_buffer(bh);
> +
> + if (wait) {
> + int err = sync_dirty_buffer(bh);
> +
> + if (err) {
> + ntfs_err(
> + sb,
> + "failed to sync buffer at block %llx, error %d",
> + (u64)block, err);
> + put_bh(bh);
> + return err;
> + }
> + }
> +
> + put_bh(bh);
> +
> + bytes -= op;
> + }
> + return 0;
> +}
> +
> +int ntfs_sb_write_run(struct ntfs_sb_info *sbi, struct runs_tree *run, u64 vbo,
> + const void *buf, size_t bytes)
> +{
> + struct super_block *sb = sbi->sb;
> + u8 cluster_bits = sbi->cluster_bits;
> + u32 off = vbo & sbi->cluster_mask;
> + CLST lcn, clen;
> + u64 lbo, len;
> + size_t idx;
> +
> + if (!run_lookup_entry(run, vbo >> cluster_bits, &lcn, &clen, &idx))
> + return -ENOENT;
> +
> + if (lcn == SPARSE_LCN)
> + return -EINVAL;
> +
> + lbo = ((u64)lcn << cluster_bits) + off;
> + len = ((u64)clen << cluster_bits) - off;
> +
> + for (;;) {
> + u32 op = len < bytes ? len : bytes;
> + int err = ntfs_sb_write(sb, lbo, op, buf, 0);
> +
> + if (err)
> + return err;
> +
> + bytes -= op;
> + if (!bytes)
> + break;
> +
> + if (!run_get_entry(run, ++idx, NULL, &lcn, &clen))
> + return -ENOENT;
> +
> + if (lcn == SPARSE_LCN)
> + return -EINVAL;
> +
> + if (buf)
> + buf = Add2Ptr(buf, op);
> +
> + lbo = ((u64)lcn << cluster_bits) + off;
> + len = ((u64)clen << cluster_bits) - off;
> + }
> +
> + return 0;
> +}
> +
> +struct buffer_head *ntfs_bread_run(struct ntfs_sb_info *sbi,
> + struct runs_tree *run, u64 vbo)
> +{
> + struct super_block *sb = sbi->sb;
> + u8 cluster_bits = sbi->cluster_bits;
> + CLST lcn;
> + u64 lbo;
> +
> + if (!run_lookup_entry(run, vbo >> cluster_bits, &lcn, NULL, NULL))
> + return ERR_PTR(-ENOENT);
> +
> + lbo = ((u64)lcn << cluster_bits) + (vbo & sbi->cluster_mask);
> +
> + return ntfs_bread(sb, lbo >> sb->s_blocksize_bits);
> +}
> +
> +int ntfs_read_run_nb(struct ntfs_sb_info *sbi, struct runs_tree *run, u64 vbo,
> + void *buf, u32 bytes, struct ntfs_buffers *nb)
> +{
> + int err;
> + struct super_block *sb = sbi->sb;
> + u32 blocksize = sb->s_blocksize;
> + u8 cluster_bits = sbi->cluster_bits;
> + u32 off = vbo & sbi->cluster_mask;
> + u32 nbh = 0;
> + CLST lcn, clen;
> + u64 lbo, len;
> + size_t idx;
> + struct buffer_head *bh;
> +
> + if (!run) {
> + /* first reading of $Volume + $MFTMirr + $LogFile goes here*/
> + if (vbo > MFT_REC_VOL * sbi->record_size) {
> + err = -ENOENT;
> + goto out;
> + }
> +
> + /* use absolute boot's 'MFTCluster' to read record */
> + lbo = vbo + sbi->mft.lbo;
> + len = sbi->record_size;
> + } else if (!run_lookup_entry(run, vbo >> cluster_bits, &lcn, &clen,
> + &idx)) {
> + err = -ENOENT;
> + goto out;
> + } else {
> + if (lcn == SPARSE_LCN) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + lbo = ((u64)lcn << cluster_bits) + off;
> + len = ((u64)clen << cluster_bits) - off;
> + }
> +
> + off = lbo & (blocksize - 1);
> + if (nb) {
> + nb->off = off;
> + nb->bytes = bytes;
> + }
> +
> + for (;;) {
> + u32 len32 = len >= bytes ? bytes : len;
> + sector_t block = lbo >> sb->s_blocksize_bits;
> +
> + do {
> + u32 op = blocksize - off;
> +
> + if (op > len32)
> + op = len32;
> +
> + bh = ntfs_bread(sb, block);
> + if (!bh) {
> + err = -EIO;
> + goto out;
> + }
> +
> + if (buf) {
> + memcpy(buf, bh->b_data + off, op);
> + buf = Add2Ptr(buf, op);
> + }
> +
> + if (!nb) {
> + put_bh(bh);
> + } else if (nbh >= ARRAY_SIZE(nb->bh)) {
> + err = -EINVAL;
> + goto out;
> + } else {
> + nb->bh[nbh++] = bh;
> + nb->nbufs = nbh;
> + }
> +
> + bytes -= op;
> + if (!bytes)
> + return 0;
> + len32 -= op;
> + block += 1;
> + off = 0;
> +
> + } while (len32);
> +
> + if (!run_get_entry(run, ++idx, NULL, &lcn, &clen)) {
> + err = -ENOENT;
> + goto out;
> + }
> +
> + if (lcn == SPARSE_LCN) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + lbo = ((u64)lcn << cluster_bits);
> + len = ((u64)clen << cluster_bits);
> + }
> +
> +out:
> + if (!nbh)
> + return err;
> +
> + while (nbh) {
> + put_bh(nb->bh[--nbh]);
> + nb->bh[nbh] = NULL;
> + }
> +
> + nb->nbufs = 0;
> + return err;
> +}
> +
> +/* Returns < 0 if error, 0 if ok, 1 if need to update fixups */
> +int ntfs_read_bh(struct ntfs_sb_info *sbi, struct runs_tree *run, u64 vbo,
> + struct NTFS_RECORD_HEADER *rhdr, u32 bytes,
> + struct ntfs_buffers *nb)
> +{
> + int err = ntfs_read_run_nb(sbi, run, vbo, rhdr, bytes, nb);
> +
> + if (err)
> + return err;
> + return ntfs_fix_post_read(rhdr, nb->bytes, true);
> +}
> +
> +int ntfs_get_bh(struct ntfs_sb_info *sbi, struct runs_tree *run, u64 vbo,
> + u32 bytes, struct ntfs_buffers *nb)
> +{
> + int err = 0;
> + struct super_block *sb = sbi->sb;
> + u32 blocksize = sb->s_blocksize;
> + u8 cluster_bits = sbi->cluster_bits;
> + u32 off;
> + u32 nbh = 0;
> + CLST lcn, clen;
> + u64 lbo, len;
> + size_t idx;
> +
> + nb->bytes = bytes;
> +
> + if (!run_lookup_entry(run, vbo >> cluster_bits, &lcn, &clen, &idx)) {
> + err = -ENOENT;
> + goto out;
> + }
> +
> + off = vbo & sbi->cluster_mask;
> + lbo = ((u64)lcn << cluster_bits) + off;
> + len = ((u64)clen << cluster_bits) - off;
> +
> + nb->off = off = lbo & (blocksize - 1);
> +
> + for (;;) {
> + u32 len32 = len < bytes ? len : bytes;
> + sector_t block = lbo >> sb->s_blocksize_bits;
> +
> + do {
> + u32 op;
> + struct buffer_head *bh;
> +
> + if (nbh >= ARRAY_SIZE(nb->bh)) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + op = blocksize - off;
> + if (op > len32)
> + op = len32;
> +
> + if (op == blocksize) {
> + bh = sb_getblk(sb, block);
> + if (!bh) {
> + err = -ENOMEM;
> + goto out;
> + }
> + if (buffer_locked(bh))
> + __wait_on_buffer(bh);
> + set_buffer_uptodate(bh);
> + } else {
> + bh = ntfs_bread(sb, block);
> + if (!bh) {
> + err = -EIO;
> + goto out;
> + }
> + }
> +
> + nb->bh[nbh++] = bh;
> + bytes -= op;
> + if (!bytes) {
> + nb->nbufs = nbh;
> + return 0;
> + }
> +
> + block += 1;
> + len32 -= op;
> + off = 0;
> + } while (len32);
> +
> + if (!run_get_entry(run, ++idx, NULL, &lcn, &clen)) {
> + err = -ENOENT;
> + goto out;
> + }
> +
> + lbo = ((u64)lcn << cluster_bits);
> + len = ((u64)clen << cluster_bits);
> + }
> +
> +out:
> + while (nbh) {
> + put_bh(nb->bh[--nbh]);
> + nb->bh[nbh] = NULL;
> + }
> +
> + nb->nbufs = 0;
> +
> + return err;
> +}
> +
> +int ntfs_write_bh(struct ntfs_sb_info *sbi, struct NTFS_RECORD_HEADER *rhdr,
> + struct ntfs_buffers *nb, int sync)
> +{
> + int err = 0;
> + struct super_block *sb = sbi->sb;
> + u32 block_size = sb->s_blocksize;
> + u32 bytes = nb->bytes;
> + u32 off = nb->off;
> + u16 fo = le16_to_cpu(rhdr->fix_off);
> + u16 fn = le16_to_cpu(rhdr->fix_num);
> + u32 idx;
> + __le16 *fixup;
> + __le16 sample;
> +
> + if ((fo & 1) || fo + fn * sizeof(short) > SECTOR_SIZE || !fn-- ||
> + fn * SECTOR_SIZE > bytes) {
> + return -EINVAL;
> + }
> +
> + for (idx = 0; bytes && idx < nb->nbufs; idx += 1, off = 0) {
> + u32 op = block_size - off;
> + char *bh_data;
> + struct buffer_head *bh = nb->bh[idx];
> + __le16 *ptr, *end_data;
> +
> + if (op > bytes)
> + op = bytes;
> +
> + if (buffer_locked(bh))
> + __wait_on_buffer(bh);
> +
> + lock_buffer(nb->bh[idx]);
> +
> + bh_data = bh->b_data + off;
> + end_data = Add2Ptr(bh_data, op);
> + memcpy(bh_data, rhdr, op);
> +
> + if (!idx) {
> + u16 t16;
> +
> + fixup = Add2Ptr(bh_data, fo);
> + sample = *fixup;
> + t16 = le16_to_cpu(sample);
> + if (t16 >= 0x7FFF) {
> + sample = *fixup = cpu_to_le16(1);
> + } else {
> + sample = cpu_to_le16(t16 + 1);
> + *fixup = sample;
> + }
> +
> + *(__le16 *)Add2Ptr(rhdr, fo) = sample;
> + }
> +
> + ptr = Add2Ptr(bh_data, SECTOR_SIZE - sizeof(short));
> +
> + do {
> + *++fixup = *ptr;
> + *ptr = sample;
> + ptr += SECTOR_SIZE / sizeof(short);
> + } while (ptr < end_data);
> +
> + set_buffer_uptodate(bh);
> + mark_buffer_dirty(bh);
> + unlock_buffer(bh);
> +
> + if (sync) {
> + int err2 = sync_dirty_buffer(bh);
> +
> + if (!err && err2)
> + err = err2;
> + }
> +
> + bytes -= op;
> + rhdr = Add2Ptr(rhdr, op);
> + }
> +
> + return err;
> +}
> +
> +int ntfs_vbo_to_lbo(struct ntfs_sb_info *sbi, struct runs_tree *run, u64 vbo,
> + u64 *lbo, u64 *bytes)
> +{
> + u32 off;
> + CLST lcn, len;
> + u8 cluster_bits = sbi->cluster_bits;
> +
> + if (!run_lookup_entry(run, vbo >> cluster_bits, &lcn, &len, NULL))
> + return -ENOENT;
> +
> + off = vbo & sbi->cluster_mask;
> + *lbo = lcn == SPARSE_LCN ? -1 : (((u64)lcn << cluster_bits) + off);
> + *bytes = ((u64)len << cluster_bits) - off;
> +
> + return 0;
> +}
> +
> +struct ntfs_inode *ntfs_new_inode(struct ntfs_sb_info *sbi, CLST rno, bool dir)
> +{
> + int err = 0;
> + struct super_block *sb = sbi->sb;
> + struct inode *inode = new_inode(sb);
> + struct ntfs_inode *ni;
> +
> + if (!inode)
> + return ERR_PTR(-ENOMEM);
> +
> + ni = ntfs_i(inode);
> +
> + err = mi_format_new(&ni->mi, sbi, rno, dir ? RECORD_FLAG_DIR : 0,
> + false);
> + if (err)
> + goto out;
> +
> + inode->i_ino = rno;
> + if (insert_inode_locked(inode) < 0) {
> + err = -EIO;
> + goto out;
> + }
> +
> +out:
> + if (err) {
> + iput(inode);
> + ni = ERR_PTR(err);
> + }
> + return ni;
> +}
> +
> +/*
> + * O:BAG:BAD:(A;OICI;FA;;;WD)
> + * owner S-1-5-32-544 (Administrators)
> + * group S-1-5-32-544 (Administrators)
> + * ACE: allow S-1-1-0 (Everyone) with FILE_ALL_ACCESS
> + */
> +const u8 s_default_security[] __aligned(8) = {
> + 0x01, 0x00, 0x04, 0x80, 0x30, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,
> + 0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x02, 0x00, 0x1C, 0x00,
> + 0x01, 0x00, 0x00, 0x00, 0x00, 0x03, 0x14, 0x00, 0xFF, 0x01, 0x1F, 0x00,
> + 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
> + 0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x20, 0x00, 0x00, 0x00,
> + 0x20, 0x02, 0x00, 0x00, 0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05,
> + 0x20, 0x00, 0x00, 0x00, 0x20, 0x02, 0x00, 0x00,
> +};
> +
> +static_assert(sizeof(s_default_security) == 0x50);
> +
> +/*
> + * ntfs_security_init
> + *
> + * loads and parse $Secure
> + */
> +int ntfs_security_init(struct ntfs_sb_info *sbi)
> +{
> + int err;
> + struct super_block *sb = sbi->sb;
> + struct inode *inode;
> + struct ntfs_inode *ni;
> + struct MFT_REF ref;
> + struct ATTRIB *attr;
> + struct ATTR_LIST_ENTRY *le;
> + u64 sds_size;
> + size_t cnt, off;
> + struct NTFS_DE *ne;
> + struct NTFS_DE_SII *sii_e;
> + struct ntfs_fnd *fnd_sii = NULL;
> + const struct INDEX_ROOT *root_sii;
> + const struct INDEX_ROOT *root_sdh;
> + struct ntfs_index *indx_sdh = &sbi->security.index_sdh;
> + struct ntfs_index *indx_sii = &sbi->security.index_sii;
> +
> + ref.low = cpu_to_le32(MFT_REC_SECURE);
> + ref.high = 0;
> + ref.seq = cpu_to_le16(MFT_REC_SECURE);
> +
> + inode = ntfs_iget5(sb, &ref, &NAME_SECURE);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + ntfs_err(sb, "Failed to load $Secure.");
> + inode = NULL;
> + goto out;
> + }
> +
> + ni = ntfs_i(inode);
> +
> + le = NULL;
> +
> + attr = ni_find_attr(ni, NULL, &le, ATTR_ROOT, SDH_NAME,
> + ARRAY_SIZE(SDH_NAME), NULL, NULL);
> + if (!attr) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + root_sdh = resident_data(attr);
> + if (root_sdh->type != ATTR_ZERO ||
> + root_sdh->rule != NTFS_COLLATION_TYPE_SECURITY_HASH) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + err = indx_init(indx_sdh, sbi, attr, INDEX_MUTEX_SDH);
> + if (err)
> + goto out;
> +
> + attr = ni_find_attr(ni, attr, &le, ATTR_ROOT, SII_NAME,
> + ARRAY_SIZE(SII_NAME), NULL, NULL);
> + if (!attr) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + root_sii = resident_data(attr);
> + if (root_sii->type != ATTR_ZERO ||
> + root_sii->rule != NTFS_COLLATION_TYPE_UINT) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + err = indx_init(indx_sii, sbi, attr, INDEX_MUTEX_SII);
> + if (err)
> + goto out;
> +
> + fnd_sii = fnd_get(indx_sii);
> + if (!fnd_sii) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + sds_size = inode->i_size;
> +
> + /* Find the last valid Id */
> + sbi->security.next_id = SECURITY_ID_FIRST;
> + /* Always write new security at the end of bucket */
> + sbi->security.next_off =
> + Quad2Align(sds_size - SecurityDescriptorsBlockSize);
> +
> + cnt = 0;
> + off = 0;
> + ne = NULL;
> +
> + for (;;) {
> + u32 next_id;
> +
> + err = indx_find_raw(indx_sii, ni, root_sii, &ne, &off, fnd_sii);
> + if (err || !ne)
> + break;
> +
> + sii_e = (struct NTFS_DE_SII *)ne;
> + if (le16_to_cpu(ne->View.data_size) < SIZEOF_SECURITY_HDR)
> + continue;
> +
> + next_id = le32_to_cpu(sii_e->sec_id) + 1;
> + if (next_id >= sbi->security.next_id)
> + sbi->security.next_id = next_id;
> +
> + cnt += 1;
> + }
> +
> + sbi->security.ni = ni;
> + inode = NULL;
> +out:
> + iput(inode);
> + fnd_put(fnd_sii);
> +
> + return err;
> +}
> +
> +/*
> + * ntfs_get_security_by_id
> + *
> + * reads security descriptor by id
> + */
> +int ntfs_get_security_by_id(struct ntfs_sb_info *sbi, __le32 security_id,
> + void **sd, size_t *size)
> +{
> + int err;
> + int diff;
> + struct ntfs_inode *ni = sbi->security.ni;
> + struct ntfs_index *indx = &sbi->security.index_sii;
> + void *p = NULL;
> + struct NTFS_DE_SII *sii_e;
> + struct ntfs_fnd *fnd_sii;
> + struct SECURITY_HDR d_security;
> + const struct INDEX_ROOT *root_sii;
> + u32 t32;
> +
> + *sd = NULL;
> +
> + inode_lock_shared(&ni->vfs_inode);
> +
> + fnd_sii = fnd_get(indx);
> + if (!fnd_sii) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + root_sii = indx_get_root(indx, ni, NULL, NULL);
> + if (!root_sii) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + /* Try to find this SECURITY descriptor in SII indexes */
> + err = indx_find(indx, ni, root_sii, &security_id, sizeof(security_id),
> + NULL, &diff, (struct NTFS_DE **)&sii_e, fnd_sii);
> + if (err)
> + goto out;
> +
> + if (diff)
> + goto out;
> +
> + t32 = le32_to_cpu(sii_e->sec_hdr.size);
> + if (t32 < SIZEOF_SECURITY_HDR) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (t32 > SIZEOF_SECURITY_HDR + 0x10000) {
> + /*
> + * looks like too big security. 0x10000 - is arbitrary big number
> + */
> + err = -EFBIG;
> + goto out;
> + }
> +
> + *size = t32 - SIZEOF_SECURITY_HDR;
> +
> + p = ntfs_alloc(*size, 0);
> + if (!p) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + err = ntfs_read_run_nb(sbi, &ni->file.run,
> + le64_to_cpu(sii_e->sec_hdr.off), &d_security,
> + sizeof(d_security), NULL);
> + if (err)
> + goto out;
> +
> + if (memcmp(&d_security, &sii_e->sec_hdr, SIZEOF_SECURITY_HDR)) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + err = ntfs_read_run_nb(sbi, &ni->file.run,
> + le64_to_cpu(sii_e->sec_hdr.off) +
> + SIZEOF_SECURITY_HDR,
> + p, *size, NULL);
> + if (err)
> + goto out;
> +
> + *sd = p;
> + p = NULL;
> +
> +out:
> + ntfs_free(p);
> + fnd_put(fnd_sii);
> + inode_unlock_shared(&ni->vfs_inode);
> +
> + return err;
> +}
> +
> +/*
> + * ntfs_insert_security
> + *
> + * inserts security descriptor into $Secure::SDS
> + *
> + * SECURITY Descriptor Stream data is organized into chunks of 256K bytes
> + * and it contains a mirror copy of each security descriptor. When writing
> + * to a security descriptor at location X, another copy will be written at
> + * location (X+256K).
> + * When writing a security descriptor that will cross the 256K boundary,
> + * the pointer will be advanced by 256K to skip
> + * over the mirror portion.
> + */
> +int ntfs_insert_security(struct ntfs_sb_info *sbi, const void *sd, u32 size_sd,
> + __le32 *security_id, bool *inserted)
> +{
> + int err, diff;
> + struct ntfs_inode *ni = sbi->security.ni;
> + struct ntfs_index *indx_sdh = &sbi->security.index_sdh;
> + struct ntfs_index *indx_sii = &sbi->security.index_sii;
> + struct NTFS_DE_SDH *e;
> + struct NTFS_DE_SDH sdh_e;
> + struct NTFS_DE_SII sii_e;
> + struct SECURITY_HDR *d_security;
> + u32 new_sec_size = size_sd + SIZEOF_SECURITY_HDR;
> + u32 aligned_sec_size = Quad2Align(new_sec_size);
> + struct SECURITY_KEY hash_key;
> + struct ntfs_fnd *fnd_sdh = NULL;
> + const struct INDEX_ROOT *root_sdh;
> + const struct INDEX_ROOT *root_sii;
> + u64 mirr_off, new_sds_size;
> + u32 next, left;
> +
> + static_assert((1 << Log2OfSecurityDescriptorsBlockSize) ==
> + SecurityDescriptorsBlockSize);
> +
> + hash_key.hash = security_hash(sd, size_sd);
> + hash_key.sec_id = SECURITY_ID_INVALID;
> +
> + if (inserted)
> + *inserted = false;
> + *security_id = SECURITY_ID_INVALID;
> +
> + /* Allocate a temporal buffer*/
> + d_security = ntfs_alloc(aligned_sec_size, 1);
> + if (!d_security)
> + return -ENOMEM;
> +
> + inode_lock(&ni->vfs_inode);
> +
> + fnd_sdh = fnd_get(indx_sdh);
> + if (!fnd_sdh) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + root_sdh = indx_get_root(indx_sdh, ni, NULL, NULL);
> + if (!root_sdh) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + root_sii = indx_get_root(indx_sii, ni, NULL, NULL);
> + if (!root_sii) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + /*
> + * Check if such security already exists
> + * use "SDH" and hash -> to get the offset in "SDS"
> + */
> + err = indx_find(indx_sdh, ni, root_sdh, &hash_key, sizeof(hash_key),
> + &d_security->key.sec_id, &diff, (struct NTFS_DE **)&e,
> + fnd_sdh);
> + if (err)
> + goto out;
> +
> + while (e) {
> + if (le32_to_cpu(e->sec_hdr.size) == new_sec_size) {
> + err = ntfs_read_run_nb(sbi, &ni->file.run,
> + le64_to_cpu(e->sec_hdr.off),
> + d_security, new_sec_size, NULL);
> + if (err)
> + goto out;
> +
> + if (le32_to_cpu(d_security->size) == new_sec_size &&
> + d_security->key.hash == hash_key.hash &&
> + !memcmp(d_security + 1, sd, size_sd)) {
> + *security_id = d_security->key.sec_id;
> + /*such security already exists*/
> + err = 0;
> + goto out;
> + }
> + }
> +
> + err = indx_find_sort(indx_sdh, ni, root_sdh,
> + (struct NTFS_DE **)&e, fnd_sdh);
> + if (err)
> + goto out;
> +
> + if (!e || e->key.hash != hash_key.hash)
> + break;
> + }
> +
> + /* Zero unused space */
> + next = sbi->security.next_off & (SecurityDescriptorsBlockSize - 1);
> + left = SecurityDescriptorsBlockSize - next;
> +
> + /* Zero gap until SecurityDescriptorsBlockSize */
> + if (left < new_sec_size) {
> + /* zero "left" bytes from sbi->security.next_off */
> + sbi->security.next_off += SecurityDescriptorsBlockSize + left;
> + }
> +
> + /* Zero tail of previous security */
> + //used = ni->vfs_inode.i_size & (SecurityDescriptorsBlockSize - 1);
> +
> + /*
> + * Example:
> + * 0x40438 == ni->vfs_inode.i_size
> + * 0x00440 == sbi->security.next_off
> + * need to zero [0x438-0x440)
> + * if (next > used) {
> + * u32 tozero = next - used;
> + * zero "tozero" bytes from sbi->security.next_off - tozero
> + */
> +
> + /* format new security descriptor */
> + d_security->key.hash = hash_key.hash;
> + d_security->key.sec_id = cpu_to_le32(sbi->security.next_id);
> + d_security->off = cpu_to_le64(sbi->security.next_off);
> + d_security->size = cpu_to_le32(new_sec_size);
> + memcpy(d_security + 1, sd, size_sd);
> +
> + /* Write main SDS bucket */
> + err = ntfs_sb_write_run(sbi, &ni->file.run, sbi->security.next_off,
> + d_security, aligned_sec_size);
> +
> + if (err)
> + goto out;
> +
> + mirr_off = sbi->security.next_off + SecurityDescriptorsBlockSize;
> + new_sds_size = mirr_off + aligned_sec_size;
> +
> + if (new_sds_size > ni->vfs_inode.i_size) {
> + err = attr_set_size(ni, ATTR_DATA, SDS_NAME,
> + ARRAY_SIZE(SDS_NAME), &ni->file.run,
> + new_sds_size, &new_sds_size, false, NULL);
> + if (err)
> + goto out;
> + }
> +
> + /* Write copy SDS bucket */
> + err = ntfs_sb_write_run(sbi, &ni->file.run, mirr_off, d_security,
> + aligned_sec_size);
> + if (err)
> + goto out;
> +
> + /* Fill SII entry */
> + sii_e.de.View.data_off =
> + cpu_to_le16(offsetof(struct NTFS_DE_SII, sec_hdr));
> + sii_e.de.View.data_size = cpu_to_le16(SIZEOF_SECURITY_HDR);
> + sii_e.de.View.Res = 0; //??
> + sii_e.de.size = cpu_to_le16(SIZEOF_SII_DIRENTRY);
> + sii_e.de.key_size = cpu_to_le16(sizeof(d_security->key.sec_id));
> + sii_e.de.flags = 0;
> + sii_e.de.res = 0;
> + sii_e.sec_id = d_security->key.sec_id;
> + memcpy(&sii_e.sec_hdr, d_security, SIZEOF_SECURITY_HDR);
> +
> + err = indx_insert_entry(indx_sii, ni, &sii_e.de, NULL, NULL);
> + if (err)
> + goto out;
> +
> + /* Fill SDH entry */
> + sdh_e.de.View.data_off =
> + cpu_to_le16(offsetof(struct NTFS_DE_SDH, sec_hdr));
> + sdh_e.de.View.data_size = cpu_to_le16(SIZEOF_SECURITY_HDR);
> + sdh_e.de.View.Res = 0;
> + sdh_e.de.size = cpu_to_le16(SIZEOF_SDH_DIRENTRY);
> + sdh_e.de.key_size = cpu_to_le16(sizeof(sdh_e.key));
> + sdh_e.de.flags = 0;
> + sdh_e.de.res = 0;
> + sdh_e.key.hash = d_security->key.hash;
> + sdh_e.key.sec_id = d_security->key.sec_id;
> + memcpy(&sdh_e.sec_hdr, d_security, SIZEOF_SECURITY_HDR);
> + sdh_e.magic[0] = cpu_to_le16('I');
> + sdh_e.magic[1] = cpu_to_le16('I');
> +
> + fnd_clear(fnd_sdh);
> + err = indx_insert_entry(indx_sdh, ni, &sdh_e.de, (void *)(size_t)1,
> + fnd_sdh);
> + if (err)
> + goto out;
> +
> + *security_id = d_security->key.sec_id;
> + if (inserted)
> + *inserted = true;
> +
> + /* Update Id and offset for next descriptor */
> + sbi->security.next_id += 1;
> + sbi->security.next_off += aligned_sec_size;
> +
> +out:
> + fnd_put(fnd_sdh);
> + inode_unlock(&ni->vfs_inode);
> + ntfs_free(d_security);
> +
> + return err;
> +}
> +
> +/*
> + * ntfs_reparse_init
> + *
> + * loads and parse $Extend/$Reparse
> + */
> +int ntfs_reparse_init(struct ntfs_sb_info *sbi)
> +{
> + int err;
> + struct ntfs_inode *ni = sbi->reparse.ni;
> + struct ntfs_index *indx = &sbi->reparse.index_r;
> + struct ATTRIB *attr;
> + struct ATTR_LIST_ENTRY *le;
> + const struct INDEX_ROOT *root_r;
> +
> + if (!ni)
> + return 0;
> +
> + le = NULL;
> + attr = ni_find_attr(ni, NULL, &le, ATTR_ROOT, SR_NAME,
> + ARRAY_SIZE(SR_NAME), NULL, NULL);
> + if (!attr) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + root_r = resident_data(attr);
> + if (root_r->type != ATTR_ZERO ||
> + root_r->rule != NTFS_COLLATION_TYPE_UINTS) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + err = indx_init(indx, sbi, attr, INDEX_MUTEX_SR);
> + if (err)
> + goto out;
> +
> +out:
> + return err;
> +}
> +
> +/*
> + * ntfs_objid_init
> + *
> + * loads and parse $Extend/$ObjId
> + */
> +int ntfs_objid_init(struct ntfs_sb_info *sbi)
> +{
> + int err;
> + struct ntfs_inode *ni = sbi->objid.ni;
> + struct ntfs_index *indx = &sbi->objid.index_o;
> + struct ATTRIB *attr;
> + struct ATTR_LIST_ENTRY *le;
> + const struct INDEX_ROOT *root;
> +
> + if (!ni)
> + return 0;
> +
> + le = NULL;
> + attr = ni_find_attr(ni, NULL, &le, ATTR_ROOT, SO_NAME,
> + ARRAY_SIZE(SO_NAME), NULL, NULL);
> + if (!attr) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + root = resident_data(attr);
> + if (root->type != ATTR_ZERO ||
> + root->rule != NTFS_COLLATION_TYPE_UINTS) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + err = indx_init(indx, sbi, attr, INDEX_MUTEX_SO);
> + if (err)
> + goto out;
> +
> +out:
> + return err;
> +}
> +
> +int ntfs_objid_remove(struct ntfs_sb_info *sbi, struct GUID *guid)
> +{
> + int err;
> + struct ntfs_inode *ni = sbi->objid.ni;
> + struct ntfs_index *indx = &sbi->objid.index_o;
> +
> + if (!ni)
> + return -EINVAL;
> +
> + inode_lock(&ni->vfs_inode);
> +
> + err = indx_delete_entry(indx, ni, guid, sizeof(*guid), NULL);
> +
> + inode_unlock(&ni->vfs_inode);
> +
> + return err;
> +}
> +
> +int ntfs_insert_reparse(struct ntfs_sb_info *sbi, __le32 rtag,
> + const struct MFT_REF *ref)
> +{
> + int err;
> + struct ntfs_inode *ni = sbi->reparse.ni;
> + struct ntfs_index *indx = &sbi->reparse.index_r;
> + struct NTFS_DE_R re;
> +
> + if (!ni)
> + return -EINVAL;
> +
> + memset(&re, 0, sizeof(re));
> +
> + re.Key.ReparseTag = rtag;
> + memcpy(&re.Key.ref, ref, sizeof(*ref));
> +
> + re.de.View.data_off = cpu_to_le16(offsetof(struct NTFS_DE_R, Key));
> + re.de.size = cpu_to_le16(QuadAlign(SIZEOF_R_DIRENTRY));
> + re.de.key_size = cpu_to_le16(sizeof(re.Key));
> +
> + inode_lock(&ni->vfs_inode);
> +
> + err = indx_insert_entry(indx, ni, &re.de, NULL, NULL);
> +
> + inode_unlock(&ni->vfs_inode);
> +
> + return err;
> +}
> +
> +int ntfs_remove_reparse(struct ntfs_sb_info *sbi, __le32 rtag,
> + const struct MFT_REF *ref)
> +{
> + int err;
> + struct ntfs_inode *ni = sbi->reparse.ni;
> + struct ntfs_index *indx = &sbi->reparse.index_r;
> + struct REPARSE_KEY rkey;
> + int diff;
> + struct NTFS_DE_R *re;
> + struct ntfs_fnd *fnd = NULL;
> + struct INDEX_ROOT *root_r;
> +
> + if (!ni)
> + return -EINVAL;
> +
> + rkey.ReparseTag = rtag;
> + rkey.ref = *ref;
> +
> + inode_lock(&ni->vfs_inode);
> +
> + if (rtag) {
> + err = indx_delete_entry(indx, ni, &rkey, sizeof(rkey), NULL);
> + goto out1;
> + }
> +
> + fnd = fnd_get(indx);
> + if (!fnd) {
> + err = -ENOMEM;
> + goto out1;
> + }
> +
> + root_r = indx_get_root(indx, ni, NULL, NULL);
> + if (!root_r) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + err = indx_find(indx, ni, root_r, &rkey, sizeof(rkey), NULL, &diff,
> + (struct NTFS_DE **)&re, fnd);
> + if (err)
> + goto out;
> +
> + if (memcmp(&re->Key.ref, ref, sizeof(*ref)))
> + goto out;
> +
> + memcpy(&rkey, &re->Key, sizeof(rkey));
> +
> + fnd_put(fnd);
> + fnd = NULL;
> +
> + err = indx_delete_entry(indx, ni, &rkey, sizeof(rkey), NULL);
> + if (err)
> + goto out;
> +
> +out:
> + fnd_put(fnd);
> +
> +out1:
> + inode_unlock(&ni->vfs_inode);
> +
> + return err;
> +}
> +
> +static inline void ntfs_unmap_and_discard(struct ntfs_sb_info *sbi, CLST lcn,
> + CLST len)
> +{
> + ntfs_unmap_meta(sbi->sb, lcn, len);
> + ntfs_discard(sbi, lcn, len);
> +}
> +
> +void mark_as_free_ex(struct ntfs_sb_info *sbi, CLST lcn, CLST len, bool trim)
> +{
> + CLST end, i;
> + struct wnd_bitmap *wnd = &sbi->used.bitmap;
> +
> + down_write_nested(&wnd->rw_lock, BITMAP_MUTEX_CLUSTERS);
> + if (!wnd_is_used(wnd, lcn, len)) {
> + ntfs_set_state(sbi, NTFS_DIRTY_ERROR);
> +
> + end = lcn + len;
> + len = 0;
> + for (i = lcn; i < end; i++) {
> + if (wnd_is_used(wnd, i, 1)) {
> + if (!len)
> + lcn = i;
> + len += 1;
> + continue;
> + }
> +
> + if (!len)
> + continue;
> +
> + if (trim)
> + ntfs_unmap_and_discard(sbi, lcn, len);
> +
> + wnd_set_free(wnd, lcn, len);
> + len = 0;
> + }
> +
> + if (!len)
> + goto out;
> + }
> +
> + if (trim)
> + ntfs_unmap_and_discard(sbi, lcn, len);
> + wnd_set_free(wnd, lcn, len);
> +
> +out:
> + up_write(&wnd->rw_lock);
> +}
> +
> +/*
> + * run_deallocate
> + *
> + * deallocate clusters
> + */
> +int run_deallocate(struct ntfs_sb_info *sbi, struct runs_tree *run, bool trim)
> +{
> + CLST lcn, len;
> + size_t idx = 0;
> +
> + while (run_get_entry(run, idx++, NULL, &lcn, &len)) {
> + if (lcn == SPARSE_LCN)
> + continue;
> +
> + mark_as_free_ex(sbi, lcn, len, trim);
> + }
> +
> + return 0;
> +}
> diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c
> new file mode 100644
> index 000000000000..d7633d69b714
> --- /dev/null
> +++ b/fs/ntfs3/index.c
> @@ -0,0 +1,2639 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * linux/fs/ntfs3/index.c
> + *
> + * Copyright (C) 2019-2020 Paragon Software GmbH, All rights reserved.
> + *
> + */
> +
> +#include <linux/blkdev.h>
> +#include <linux/buffer_head.h>
> +#include <linux/fs.h>
> +#include <linux/nls.h>
> +#include <linux/sched/signal.h>
> +
> +#include "debug.h"
> +#include "ntfs.h"
> +#include "ntfs_fs.h"
> +
> +static const struct INDEX_NAMES {
> + const __le16 *name;
> + u8 name_len;
> +} s_index_names[INDEX_MUTEX_TOTAL] = {
> + { I30_NAME, ARRAY_SIZE(I30_NAME) }, { SII_NAME, ARRAY_SIZE(SII_NAME) },
> + { SDH_NAME, ARRAY_SIZE(SDH_NAME) }, { SO_NAME, ARRAY_SIZE(SO_NAME) },
> + { SQ_NAME, ARRAY_SIZE(SQ_NAME) }, { SR_NAME, ARRAY_SIZE(SR_NAME) },
> +};
> +
> +static int cmp_fnames(const struct ATTR_FILE_NAME *f1, size_t l1,
> + const struct ATTR_FILE_NAME *f2, size_t l2,
> + const struct ntfs_sb_info *sbi)
> +{
> + int diff;
> + u16 fsize2;
> +
> + if (l2 <= offsetof(struct ATTR_FILE_NAME, name))
> + return -1;
> +
> + fsize2 = fname_full_size(f2);
> + if (l2 < fsize2)
> + return -1;
> +
> + if (!l1) {
> + const struct cpu_str *s1 = (struct cpu_str *)f1;
> + const struct le_str *s2 = (struct le_str *)&f2->name_len;
> +
> + diff = ntfs_cmp_names_cpu(s1, s2, sbi->upcase);
> +
> + if (diff)
> + return diff;
> +
> + /*
> + * If names are equal (case insensitive)
> + * try to compare it case sensitive
> + */
> + if (/*sbi->options.nocase || */ f2->type == FILE_NAME_DOS)
> + return 0;
> +
> + return ntfs_cmp_names_cpu(s1, s2, NULL);
> + }
> +
> + diff = ntfs_cmp_names(f1->name, f1->name_len, f2->name, f2->name_len,
> + sbi->upcase);
> +
> + if (diff)
> + return diff;
> +
> + /*
> + * If names are equal (case insensitive)
> + * try to compare it case sensitive
> + */
> + if (/*sbi->options.nocase || */ f2->type == FILE_NAME_DOS)
> + return 0;
> +
> + return ntfs_cmp_names(f1->name, f1->name_len, f2->name, f2->name_len,
> + NULL);
> +}
> +
> +static int cmp_uint(const u32 *k1, size_t l1, const u32 *k2, size_t l2,
> + const void *p)
> +{
> + if (l2 < sizeof(u32))
> + return -1;
> +
> + if (*k1 < *k2)
> + return -1;
> + if (*k1 > *k2)
> + return 1;
> + return 0;
> +}
> +
> +static int cmp_sdh(const struct SECURITY_KEY *k1, size_t l1,
> + const struct SECURITY_KEY *k2, size_t l2, const void *p)
> +{
> + u32 t1, t2;
> +
> + if (l2 < sizeof(struct SECURITY_KEY))
> + return -1;
> +
> + t1 = le32_to_cpu(k1->hash);
> + t2 = le32_to_cpu(k2->hash);
> +
> + /* First value is a hash value itself */
> + if (t1 < t2)
> + return -1;
> + if (t1 > t2)
> + return 1;
> +
> + /* Second value is security Id */
> + if (p) {
> + t1 = le32_to_cpu(k1->sec_id);
> + t2 = le32_to_cpu(k2->sec_id);
> + if (t1 < t2)
> + return -1;
> + if (t1 > t2)
> + return 1;
> + }
> +
> + return 0;
> +}
> +
> +static int cmp_uints(const __le32 *k1, size_t l1, const __le32 *k2, size_t l2,
> + const void *p)
> +{
> + size_t count;
> +
> + if (l2 < sizeof(int))
> + return -1;
> +
> + for (count = min(l1, l2) >> 2; count > 0; --count, ++k1, ++k2) {
> + u32 t1 = le32_to_cpu(*k1);
> + u32 t2 = le32_to_cpu(*k2);
> +
> + if (t1 > t2)
> + return 1;
> + if (t1 < t2)
> + return -1;
> + }
> +
> + if (l1 > l2)
> + return 1;
> + if (l1 < l2)
> + return -1;
> +
> + return 0;
> +}
> +
> +static inline NTFS_CMP_FUNC get_cmp_func(const struct INDEX_ROOT *root)
> +{
> + switch (root->type) {
> + case ATTR_NAME:
> + if (root->rule == NTFS_COLLATION_TYPE_FILENAME)
> + return (NTFS_CMP_FUNC)&cmp_fnames;
> + break;
> + case ATTR_ZERO:
> + switch (root->rule) {
> + case NTFS_COLLATION_TYPE_UINT:
> + return (NTFS_CMP_FUNC)&cmp_uint;
> + case NTFS_COLLATION_TYPE_SECURITY_HASH:
> + return (NTFS_CMP_FUNC)&cmp_sdh;
> + case NTFS_COLLATION_TYPE_UINTS:
> + return (NTFS_CMP_FUNC)&cmp_uints;
> + default:
> + break;
> + }
> + default:
> + break;
> + }
> +
> + return NULL;
> +}
> +
> +struct bmp_buf {
> + struct ATTRIB *b;
> + struct mft_inode *mi;
> + struct buffer_head *bh;
> + ulong *buf;
> + size_t bit;
> + u32 nbits;
> + u64 new_valid;
> +};
> +
> +static int bmp_buf_get(struct ntfs_index *indx, struct ntfs_inode *ni,
> + size_t bit, struct bmp_buf *bbuf)
> +{
> + struct ATTRIB *b;
> + size_t data_size, valid_size, vbo, off = bit >> 3;
> + struct ntfs_sb_info *sbi = ni->mi.sbi;
> + CLST vcn = off >> sbi->cluster_bits;
> + struct ATTR_LIST_ENTRY *le = NULL;
> + struct buffer_head *bh;
> + struct super_block *sb;
> + u32 blocksize;
> + const struct INDEX_NAMES *in = &s_index_names[indx->type];
> +
> + bbuf->bh = NULL;
> +
> + b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len,
> + &vcn, &bbuf->mi);
> + bbuf->b = b;
> + if (!b)
> + return -EINVAL;
> +
> + if (!b->non_res) {
> + data_size = le32_to_cpu(b->res.data_size);
> +
> + if (off >= data_size)
> + return -EINVAL;
> +
> + bbuf->buf = (ulong *)resident_data(b);
> + bbuf->bit = 0;
> + bbuf->nbits = data_size * 8;
> +
> + return 0;
> + }
> +
> + data_size = le64_to_cpu(b->nres.data_size);
> + if (off >= data_size) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> +
> + valid_size = le64_to_cpu(b->nres.valid_size);
> +
> + bh = ntfs_bread_run(sbi, &indx->bitmap_run, off);
> + if (!bh)
> + return -EIO;
> +
> + if (IS_ERR(bh))
> + return PTR_ERR(bh);
> +
> + bbuf->bh = bh;
> +
> + if (buffer_locked(bh))
> + __wait_on_buffer(bh);
> +
> + lock_buffer(bh);
> +
> + sb = sbi->sb;
> + blocksize = sb->s_blocksize;
> +
> + vbo = off & ~(size_t)sbi->block_mask;
> +
> + bbuf->new_valid = vbo + blocksize;
> + if (bbuf->new_valid <= valid_size)
> + bbuf->new_valid = 0;
> + else if (bbuf->new_valid > data_size)
> + bbuf->new_valid = data_size;
> +
> + if (vbo >= valid_size) {
> + memset(bh->b_data, 0, blocksize);
> + } else if (vbo + blocksize > valid_size) {
> + u32 voff = valid_size & sbi->block_mask;
> +
> + memset(bh->b_data + voff, 0, blocksize - voff);
> + }
> +
> + bbuf->buf = (ulong *)bh->b_data;
> + bbuf->bit = 8 * (off & ~(size_t)sbi->block_mask);
> + bbuf->nbits = 8 * blocksize;
> +
> + return 0;
> +}
> +
> +static void bmp_buf_put(struct bmp_buf *bbuf, bool dirty)
> +{
> + struct buffer_head *bh = bbuf->bh;
> + struct ATTRIB *b = bbuf->b;
> +
> + if (!bh) {
> + if (b && !b->non_res && dirty)
> + bbuf->mi->dirty = true;
> + return;
> + }
> +
> + if (!dirty)
> + goto out;
> +
> + if (bbuf->new_valid) {
> + b->nres.valid_size = cpu_to_le64(bbuf->new_valid);
> + bbuf->mi->dirty = true;
> + }
> +
> + set_buffer_uptodate(bh);
> + mark_buffer_dirty(bh);
> +
> +out:
> + unlock_buffer(bh);
> + put_bh(bh);
> +}
> +
> +/*
> + * indx_mark_used
> + *
> + * marks the bit 'bit' as used
> + */
> +static int indx_mark_used(struct ntfs_index *indx, struct ntfs_inode *ni,
> + size_t bit)
> +{
> + int err;
> + struct bmp_buf bbuf;
> +
> + err = bmp_buf_get(indx, ni, bit, &bbuf);
> + if (err)
> + return err;
> +
> + __set_bit(bit - bbuf.bit, bbuf.buf);
> +
> + bmp_buf_put(&bbuf, true);
> +
> + return 0;
> +}
> +
> +/*
> + * indx_mark_free
> + *
> + * the bit 'bit' as free
> + */
> +static int indx_mark_free(struct ntfs_index *indx, struct ntfs_inode *ni,
> + size_t bit)
> +{
> + int err;
> + struct bmp_buf bbuf;
> +
> + err = bmp_buf_get(indx, ni, bit, &bbuf);
> + if (err)
> + return err;
> +
> + __clear_bit(bit - bbuf.bit, bbuf.buf);
> +
> + bmp_buf_put(&bbuf, true);
> +
> + return 0;
> +}
> +
> +static int scan_nres_bitmap(struct ntfs_sb_info *sbi, struct ATTRIB *bitmap,
> + struct runs_tree *run, size_t from,
> + bool (*fn)(const ulong *buf, u32 bit, u32 bits,
> + size_t *ret),
> + size_t *ret)
> +{
> + struct super_block *sb = sbi->sb;
> + u32 nbits = sb->s_blocksize * 8;
> + u32 blocksize = sb->s_blocksize;
> + u64 valid_size = le64_to_cpu(bitmap->nres.valid_size);
> + u64 data_size = le64_to_cpu(bitmap->nres.data_size);
> + sector_t eblock = bytes_to_block(sb, data_size);
> + size_t vbo = from >> 3;
> + sector_t blk = (vbo & sbi->cluster_mask) >> sb->s_blocksize_bits;
> + sector_t vblock = vbo >> sb->s_blocksize_bits;
> + sector_t blen, block;
> + CLST lcn, len;
> + size_t idx;
> + struct buffer_head *bh;
> +
> + *ret = MINUS_ONE_T;
> +
> + if (vblock >= eblock)
> + return 0;
> +
> + from &= nbits - 1;
> +
> + if (!run_lookup_entry(run, vbo >> sbi->cluster_bits, &lcn, &len,
> + &idx)) {
> + return -ENOENT;
> + }
> +
> + blen = (sector_t)len * sbi->blocks_per_cluster;
> + block = (sector_t)lcn * sbi->blocks_per_cluster;
> +
> +next_run:
> + for (; blk < blen; blk++, from = 0) {
> + bool ok;
> +
> + bh = ntfs_bread(sb, block + blk);
> + if (!bh)
> + return -EIO;
> +
> + vbo = (u64)vblock << sb->s_blocksize_bits;
> + if (vbo >= valid_size) {
> + memset(bh->b_data, 0, blocksize);
> + } else if (vbo + blocksize > valid_size) {
> + u32 voff = valid_size & sbi->block_mask;
> +
> + memset(bh->b_data + voff, 0, blocksize - voff);
> + }
> +
> + if (vbo + blocksize > data_size)
> + nbits = 8 * (data_size - vbo);
> +
> + ok = nbits > from ?
> + (*fn)((ulong *)bh->b_data, from, nbits, ret) :
> + false;
> + put_bh(bh);
> +
> + if (ok) {
> + *ret += 8 * vbo;
> + return 0;
> + }
> +
> + if (++vblock >= eblock) {
> + *ret = MINUS_ONE_T;
> + return 0;
> + }
> + }
> +
> + if (!run_get_entry(run, ++idx, NULL, &lcn, &len))
> + return -ENOENT;
> +
> + blk = 0;
> + blen = (sector_t)len * sbi->blocks_per_cluster;
> + block = (sector_t)lcn * sbi->blocks_per_cluster;
> + goto next_run;
> +}
> +
> +static bool scan_for_free(const ulong *buf, u32 bit, u32 bits, size_t *ret)
> +{
> + size_t pos = find_next_zero_bit(buf, bits, bit);
> +
> + if (pos >= bits)
> + return false;
> + *ret = pos;
> + return true;
> +}
> +
> +/*
> + * indx_find_free
> + *
> + * looks for free bit
> + * returns -1 if no free bits
> + */
> +static int indx_find_free(struct ntfs_index *indx, struct ntfs_inode *ni,
> + size_t *bit, struct ATTRIB **bitmap)
> +{
> + struct ATTRIB *b;
> + struct ATTR_LIST_ENTRY *le = NULL;
> + const struct INDEX_NAMES *in = &s_index_names[indx->type];
> +
> + b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len,
> + NULL, NULL);
> +
> + if (!b)
> + return -ENOENT;
> +
> + *bitmap = b;
> + *bit = MINUS_ONE_T;
> +
> + if (!b->non_res) {
> + u32 nbits = 8 * le32_to_cpu(b->res.data_size);
> + size_t pos = find_next_zero_bit(resident_data(b), nbits, 0);
> +
> + if (pos < nbits)
> + *bit = pos;
> + } else {
> + int err = scan_nres_bitmap(ni->mi.sbi, b, &indx->bitmap_run, 0,
> + &scan_for_free, bit);
> +
> + if (err)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static bool scan_for_used(const ulong *buf, u32 bit, u32 bits, size_t *ret)
> +{
> + size_t pos = find_next_bit(buf, bits, bit);
> +
> + if (pos >= bits)
> + return false;
> + *ret = pos;
> + return true;
> +}
> +
> +/*
> + * indx_used_bit
> + *
> + * looks for used bit
> + * returns MINUS_ONE_T if no used bits
> + */
> +int indx_used_bit(struct ntfs_index *indx, struct ntfs_inode *ni, size_t *bit)
> +{
> + struct ATTRIB *b;
> + struct ATTR_LIST_ENTRY *le = NULL;
> + size_t from = *bit;
> + const struct INDEX_NAMES *in = &s_index_names[indx->type];
> +
> + b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len,
> + NULL, NULL);
> +
> + if (!b)
> + return -ENOENT;
> +
> + *bit = MINUS_ONE_T;
> +
> + if (!b->non_res) {
> + u32 nbits = le32_to_cpu(b->res.data_size) * 8;
> + size_t pos = find_next_bit(resident_data(b), nbits, from);
> +
> + if (pos < nbits)
> + *bit = pos;
> + } else {
> + int err = scan_nres_bitmap(ni->mi.sbi, b, &indx->bitmap_run,
> + from, &scan_for_used, bit);
> + if (err)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * hdr_find_split
> + *
> + * finds a point at which the index allocation buffer would like to
> + * be split.
> + * NOTE: This function should never return 'END' entry NULL returns on error
> + */
> +static inline const struct NTFS_DE *hdr_find_split(const struct INDEX_HDR *hdr)
> +{
> + size_t o;
> + const struct NTFS_DE *e = hdr_first_de(hdr);
> + u32 used_2 = le32_to_cpu(hdr->used) >> 1;
> + u16 esize = le16_to_cpu(e->size);
> +
> + if (!e || de_is_last(e))
> + return NULL;
> +
> + for (o = le32_to_cpu(hdr->de_off) + esize; o < used_2; o += esize) {
> + const struct NTFS_DE *p = e;
> +
> + e = Add2Ptr(hdr, o);
> +
> + /* We must not return END entry */
> + if (de_is_last(e))
> + return p;
> +
> + esize = le16_to_cpu(e->size);
> + }
> +
> + return e;
> +}
> +
> +/*
> + * hdr_insert_head
> + *
> + * inserts some entries at the beginning of the buffer.
> + * It is used to insert entries into a newly-created buffer.
> + */
> +static inline const struct NTFS_DE *
> +hdr_insert_head(struct INDEX_HDR *hdr, const void *ins, u32 ins_bytes)
> +{
> + u32 to_move;
> + struct NTFS_DE *e = hdr_first_de(hdr);
> + u32 used = le32_to_cpu(hdr->used);
> +
> + if (!e)
> + return NULL;
> +
> + /* Now we just make room for the inserted entries and jam it in. */
> + to_move = used - le32_to_cpu(hdr->de_off);
> + memmove(Add2Ptr(e, ins_bytes), e, to_move);
> + memcpy(e, ins, ins_bytes);
> + hdr->used = cpu_to_le32(used + ins_bytes);
> +
> + return e;
> +}
> +
> +void fnd_clear(struct ntfs_fnd *fnd)
> +{
> + int i;
> +
> + for (i = 0; i < fnd->level; i++) {
> + struct indx_node *n = fnd->nodes[i];
> +
> + if (!n)
> + continue;
> +
> + put_indx_node(n);
> + fnd->nodes[i] = NULL;
> + }
> + fnd->level = 0;
> + fnd->root_de = NULL;
> +}
> +
> +static int fnd_push(struct ntfs_fnd *fnd, struct indx_node *n,
> + struct NTFS_DE *e)
> +{
> + int i;
> +
> + i = fnd->level;
> + if (i < 0 || i >= ARRAY_SIZE(fnd->nodes))
> + return -EINVAL;
> + fnd->nodes[i] = n;
> + fnd->de[i] = e;
> + fnd->level += 1;
> + return 0;
> +}
> +
> +static struct indx_node *fnd_pop(struct ntfs_fnd *fnd)
> +{
> + struct indx_node *n;
> + int i = fnd->level;
> +
> + i -= 1;
> + n = fnd->nodes[i];
> + fnd->nodes[i] = NULL;
> + fnd->level = i;
> +
> + return n;
> +}
> +
> +static bool fnd_is_empty(struct ntfs_fnd *fnd)
> +{
> + if (!fnd->level)
> + return !fnd->root_de;
> +
> + return !fnd->de[fnd->level - 1];
> +}
> +
> +struct ntfs_fnd *fnd_get(struct ntfs_index *indx)
> +{
> + struct ntfs_fnd *fnd = ntfs_alloc(sizeof(struct ntfs_fnd), 1);
> +
> + if (!fnd)
> + return NULL;
> +
> + return fnd;
> +}
> +
> +void fnd_put(struct ntfs_fnd *fnd)
> +{
> + if (!fnd)
> + return;
> + fnd_clear(fnd);
> + ntfs_free(fnd);
> +}
> +
> +/*
> + * hdr_find_e
> + *
> + * locates an entry the index buffer.
> + * If no matching entry is found, it returns the first entry which is greater
> + * than the desired entry If the search key is greater than all the entries the
> + * buffer, it returns the 'end' entry. This function does a binary search of the
> + * current index buffer, for the first entry that is <= to the search value
> + * Returns NULL if error
> + */
> +static struct NTFS_DE *hdr_find_e(const struct ntfs_index *indx,
> + const struct INDEX_HDR *hdr, const void *key,
> + size_t key_len, const void *ctx, int *diff)
> +{
> + struct NTFS_DE *e;
> + NTFS_CMP_FUNC cmp = indx->cmp;
> + u32 e_size, e_key_len;
> + u32 end = le32_to_cpu(hdr->used);
> + u32 off = le32_to_cpu(hdr->de_off);
> +
> +#ifdef NTFS3_INDEX_BINARY_SEARCH
> + int max_idx = 0, fnd, min_idx;
> + int nslots = 64;
> + u16 *offs;
> +
> + if (end > 0x10000)
> + goto next;
> +
> + offs = ntfs_alloc(sizeof(u16) * nslots, 0);
> + if (!offs)
> + goto next;
> +
> + /* use binary search algorithm */
> +next1:
> + if (off + sizeof(struct NTFS_DE) > end) {
> + e = NULL;
> + goto out1;
> + }
> + e = Add2Ptr(hdr, off);
> + e_size = le16_to_cpu(e->size);
> +
> + if (e_size < sizeof(struct NTFS_DE) || off + e_size > end) {
> + e = NULL;
> + goto out1;
> + }
> +
> + if (max_idx >= nslots) {
> + u16 *ptr;
> + int new_slots = QuadAlign(2 * nslots);
> +
> + ptr = ntfs_alloc(sizeof(u16) * new_slots, 0);
> + if (ptr)
> + memcpy(ptr, offs, sizeof(u16) * max_idx);
> + ntfs_free(offs);
> + offs = ptr;
> + nslots = new_slots;
> + if (!ptr)
> + goto next;
> + }
> +
> + /* Store entry table */
> + offs[max_idx] = off;
> +
> + if (!de_is_last(e)) {
> + off += e_size;
> + max_idx += 1;
> + goto next1;
> + }
> +
> + /*
> + * Table of pointers is created
> + * Use binary search to find entry that is <= to the search value
> + */
> + fnd = -1;
> + min_idx = 0;
> +
> + while (min_idx <= max_idx) {
> + int mid_idx = min_idx + ((max_idx - min_idx) >> 1);
> + int diff2;
> +
> + e = Add2Ptr(hdr, offs[mid_idx]);
> +
> + e_key_len = le16_to_cpu(e->key_size);
> +
> + diff2 = (*cmp)(key, key_len, e + 1, e_key_len, ctx);
> +
> + if (!diff2) {
> + *diff = 0;
> + goto out1;
> + }
> +
> + if (diff2 < 0) {
> + max_idx = mid_idx - 1;
> + fnd = mid_idx;
> + if (!fnd)
> + break;
> + } else {
> + min_idx = mid_idx + 1;
> + }
> + }
> +
> + if (fnd == -1) {
> + e = NULL;
> + goto out1;
> + }
> +
> + *diff = -1;
> + e = Add2Ptr(hdr, offs[fnd]);
> +
> +out1:
> + ntfs_free(offs);
> +
> + return e;
> +#endif
> +
> +next:
> + /*
> + * Entries index are sorted
> + * Enumerate all entries until we find entry that is <= to the search value
> + */
> + if (off + sizeof(struct NTFS_DE) > end)
> + return NULL;
> +
> + e = Add2Ptr(hdr, off);
> + e_size = le16_to_cpu(e->size);
> +
> + if (e_size < sizeof(struct NTFS_DE) || off + e_size > end)
> + return NULL;
> +
> + off += e_size;
> +
> + e_key_len = le16_to_cpu(e->key_size);
> +
> + *diff = (*cmp)(key, key_len, e + 1, e_key_len, ctx);
> + if (!*diff)
> + return e;
> +
> + if (*diff <= 0)
> + return e;
> +
> + if (de_is_last(e)) {
> + *diff = 1;
> + return e;
> + }
> + goto next;
> +}
> +
> +/*
> + * hdr_insert_de
> + *
> + * inserts an index entry into the buffer.
> + * 'before' should be a pointer previously returned from hdr_find_e
> + */
> +static struct NTFS_DE *hdr_insert_de(const struct ntfs_index *indx,
> + struct INDEX_HDR *hdr,
> + const struct NTFS_DE *de,
> + struct NTFS_DE *before, const void *ctx)
> +{
> + int diff;
> + size_t off = PtrOffset(hdr, before);
> + u32 used = le32_to_cpu(hdr->used);
> + u32 total = le32_to_cpu(hdr->total);
> + u16 de_size = le16_to_cpu(de->size);
> +
> + /* First, check to see if there's enough room */
> + if (used + de_size > total)
> + return NULL;
> +
> + /* We know there's enough space, so we know we'll succeed. */
> + if (before) {
> + /* Check that before is inside Index */
> + if (off >= used || off < le32_to_cpu(hdr->de_off) ||
> + off + le16_to_cpu(before->size) > total) {
> + return NULL;
> + }
> + goto ok;
> + }
> + /* No insert point is applied. Get it manually */
> + before = hdr_find_e(indx, hdr, de + 1, le16_to_cpu(de->key_size), ctx,
> + &diff);
> + if (!before)
> + return NULL;
> + off = PtrOffset(hdr, before);
> +
> +ok:
> + /* Now we just make room for the entry and jam it in. */
> + memmove(Add2Ptr(before, de_size), before, used - off);
> +
> + hdr->used = cpu_to_le32(used + de_size);
> + memcpy(before, de, de_size);
> +
> + return before;
> +}
> +
> +/*
> + * hdr_delete_de
> + *
> + * removes an entry from the index buffer
> + */
> +static inline struct NTFS_DE *hdr_delete_de(struct INDEX_HDR *hdr,
> + struct NTFS_DE *re)
> +{
> + u32 used = le32_to_cpu(hdr->used);
> + u16 esize = le16_to_cpu(re->size);
> + u32 off = PtrOffset(hdr, re);
> + int bytes = used - (off + esize);
> +
> + if (off >= used || esize < sizeof(struct NTFS_DE) ||
> + bytes < sizeof(struct NTFS_DE))
> + return NULL;
> +
> + hdr->used = cpu_to_le32(used - esize);
> + memmove(re, Add2Ptr(re, esize), bytes);
> +
> + return re;
> +}
> +
> +void indx_clear(struct ntfs_index *indx)
> +{
> + run_close(&indx->alloc_run);
> + run_close(&indx->bitmap_run);
> +}
> +
> +int indx_init(struct ntfs_index *indx, struct ntfs_sb_info *sbi,
> + const struct ATTRIB *attr, enum index_mutex_classed type)
> +{
> + u32 t32;
> + const struct INDEX_ROOT *root = resident_data(attr);
> +
> + /* Check root fields */
> + if (!root->index_block_clst)
> + return -EINVAL;
> +
> + indx->type = type;
> + indx->idx2vbn_bits = __ffs(root->index_block_clst);
> +
> + t32 = le32_to_cpu(root->index_block_size);
> + indx->index_bits = blksize_bits(t32);
> +
> + /* Check index record size */
> + if (t32 < sbi->cluster_size) {
> + /* index record is smaller than a cluster, use 512 blocks */
> + if (t32 != root->index_block_clst * SECTOR_SIZE)
> + return -EINVAL;
> +
> + /* Check alignment to a cluster */
> + if ((sbi->cluster_size >> SECTOR_SHIFT) &
> + (root->index_block_clst - 1)) {
> + return -EINVAL;
> + }
> +
> + indx->vbn2vbo_bits = SECTOR_SHIFT;
> + } else {
> + /* index record must be a multiple of cluster size */
> + if (t32 != root->index_block_clst << sbi->cluster_bits)
> + return -EINVAL;
> +
> + indx->vbn2vbo_bits = sbi->cluster_bits;
> + }
> +
> + indx->cmp = get_cmp_func(root);
> +
> + return indx->cmp ? 0 : -EINVAL;
> +}
> +
> +static struct indx_node *indx_new(struct ntfs_index *indx,
> + struct ntfs_inode *ni, CLST vbn,
> + const __le64 *sub_vbn)
> +{
> + int err;
> + struct NTFS_DE *e;
> + struct indx_node *r;
> + struct INDEX_HDR *hdr;
> + struct INDEX_BUFFER *index;
> + u64 vbo = (u64)vbn << indx->vbn2vbo_bits;
> + u32 bytes = 1u << indx->index_bits;
> + u16 fn;
> + u32 eo;
> +
> + r = ntfs_alloc(sizeof(struct indx_node), 1);
> + if (!r)
> + return ERR_PTR(-ENOMEM);
> +
> + index = ntfs_alloc(bytes, 1);
> + if (!index) {
> + ntfs_free(r);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + err = ntfs_get_bh(ni->mi.sbi, &indx->alloc_run, vbo, bytes, &r->nb);
> +
> + if (err) {
> + ntfs_free(index);
> + ntfs_free(r);
> + return ERR_PTR(err);
> + }
> +
> + /* Create header */
> + index->rhdr.sign = NTFS_INDX_SIGNATURE;
> + index->rhdr.fix_off = cpu_to_le16(sizeof(struct INDEX_BUFFER)); // 0x28
> + fn = (bytes >> SECTOR_SHIFT) + 1; // 9
> + index->rhdr.fix_num = cpu_to_le16(fn);
> + index->vbn = cpu_to_le64(vbn);
> + hdr = &index->ihdr;
> + eo = QuadAlign(sizeof(struct INDEX_BUFFER) + fn * sizeof(short));
> + hdr->de_off = cpu_to_le32(eo);
> +
> + e = Add2Ptr(hdr, eo);
> +
> + if (sub_vbn) {
> + e->flags = NTFS_IE_LAST | NTFS_IE_HAS_SUBNODES;
> + e->size = cpu_to_le16(sizeof(struct NTFS_DE) + sizeof(u64));
> + hdr->used =
> + cpu_to_le32(eo + sizeof(struct NTFS_DE) + sizeof(u64));
> + de_set_vbn_le(e, *sub_vbn);
> + hdr->flags = 1;
> + } else {
> + e->size = cpu_to_le16(sizeof(struct NTFS_DE));
> + hdr->used = cpu_to_le32(eo + sizeof(struct NTFS_DE));
> + e->flags = NTFS_IE_LAST;
> + }
> +
> + hdr->total = cpu_to_le32(bytes - offsetof(struct INDEX_BUFFER, ihdr));
> +
> + r->index = index;
> + return r;
> +}
> +
> +struct INDEX_ROOT *indx_get_root(struct ntfs_index *indx, struct ntfs_inode *ni,
> + struct ATTRIB **attr, struct mft_inode **mi)
> +{
> + struct ATTR_LIST_ENTRY *le = NULL;
> + struct ATTRIB *a;
> + const struct INDEX_NAMES *in = &s_index_names[indx->type];
> +
> + a = ni_find_attr(ni, NULL, &le, ATTR_ROOT, in->name, in->name_len, NULL,
> + mi);
> + if (!a)
> + return NULL;
> +
> + if (attr)
> + *attr = a;
> +
> + return resident_data_ex(a, sizeof(struct INDEX_ROOT));
> +}
> +
> +static int indx_write(struct ntfs_index *indx, struct ntfs_inode *ni,
> + struct indx_node *node, int sync)
> +{
> + struct INDEX_BUFFER *ib = node->index;
> +
> + return ntfs_write_bh(ni->mi.sbi, &ib->rhdr, &node->nb, sync);
> +}
> +
> +int indx_read(struct ntfs_index *indx, struct ntfs_inode *ni, CLST vbn,
> + struct indx_node **node)
> +{
> + int err;
> + struct INDEX_BUFFER *ib;
> + u64 vbo = (u64)vbn << indx->vbn2vbo_bits;
> + u32 bytes = 1u << indx->index_bits;
> + struct indx_node *in = *node;
> + const struct INDEX_NAMES *name;
> +
> + if (!in) {
> + in = ntfs_alloc(sizeof(struct indx_node), 1);
> + if (!in)
> + return -ENOMEM;
> + } else {
> + nb_put(&in->nb);
> + }
> +
> + ib = in->index;
> + if (!ib) {
> + ib = ntfs_alloc(bytes, 0);
> + if (!ib) {
> + err = -ENOMEM;
> + goto out;
> + }
> + }
> +
> + err = ntfs_read_bh(ni->mi.sbi, &indx->alloc_run, vbo, &ib->rhdr, bytes,
> + &in->nb);
> +
> + if (!err)
> + goto ok;
> +
> + if (err == 1)
> + goto ok;
> +
> + if (err != -ENOENT)
> + goto out;
> +
> + name = &s_index_names[indx->type];
> + err = attr_load_runs_vcn(ni, ATTR_ALLOC, name->name, name->name_len,
> + &indx->alloc_run,
> + vbo >> ni->mi.sbi->cluster_bits);
> + if (err)
> + goto out;
> +
> + err = ntfs_read_bh(ni->mi.sbi, &indx->alloc_run, vbo, &ib->rhdr, bytes,
> + &in->nb);
> + if (err == 1)
> + goto ok;
> +
> + if (err)
> + goto out;
> +
> +ok:
> + if (err == 1) {
> + ntfs_write_bh(ni->mi.sbi, &ib->rhdr, &in->nb, 0);
> + err = 0;
> + }
> +
> + in->index = ib;
> + *node = in;
> +
> +out:
> + if (ib != in->index)
> + ntfs_free(ib);
> +
> + if (*node != in) {
> + nb_put(&in->nb);
> + ntfs_free(in);
> + }
> +
> + return err;
> +}
> +
> +/*
> + * indx_find
> + *
> + * scans NTFS directory for given entry
> + */
> +int indx_find(struct ntfs_index *indx, struct ntfs_inode *ni,
> + const struct INDEX_ROOT *root, const void *key, size_t key_len,
> + const void *ctx, int *diff, struct NTFS_DE **entry,
> + struct ntfs_fnd *fnd)
> +{
> + int err;
> + struct NTFS_DE *e;
> + const struct INDEX_HDR *hdr;
> + struct indx_node *node;
> +
> + if (!root)
> + root = indx_get_root(&ni->dir, ni, NULL, NULL);
> +
> + if (!root) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + hdr = &root->ihdr;
> +
> + /* Check cache */
> + e = fnd->level ? fnd->de[fnd->level - 1] : fnd->root_de;
> + if (e && !de_is_last(e) &&
> + !(*indx->cmp)(key, key_len, e + 1, le16_to_cpu(e->key_size), ctx)) {
> + *entry = e;
> + *diff = 0;
> + return 0;
> + }
> +
> + /* Soft finder reset */
> + fnd_clear(fnd);
> +
> + /* Lookup entry that is <= to the search value */
> + e = hdr_find_e(indx, hdr, key, key_len, ctx, diff);
> + if (!e)
> + return -EINVAL;
> +
> + if (fnd)
> + fnd->root_de = e;
> +
> + err = 0;
> +
> + for (;;) {
> + node = NULL;
> + if (*diff >= 0 || !de_has_vcn_ex(e)) {
> + *entry = e;
> + goto out;
> + }
> +
> + /* Read next level. */
> + err = indx_read(indx, ni, de_get_vbn(e), &node);
> + if (err)
> + goto out;
> +
> + /* Lookup entry that is <= to the search value */
> + e = hdr_find_e(indx, &node->index->ihdr, key, key_len, ctx,
> + diff);
> + if (!e) {
> + err = -EINVAL;
> + put_indx_node(node);
> + goto out;
> + }
> +
> + fnd_push(fnd, node, e);
> + }
> +
> +out:
> + return err;
> +}
> +
> +int indx_find_sort(struct ntfs_index *indx, struct ntfs_inode *ni,
> + const struct INDEX_ROOT *root, struct NTFS_DE **entry,
> + struct ntfs_fnd *fnd)
> +{
> + int err;
> + struct indx_node *n = NULL;
> + struct NTFS_DE *e;
> + size_t iter = 0;
> + int level = fnd->level;
> +
> + if (!*entry) {
> + /* Start find */
> + e = hdr_first_de(&root->ihdr);
> + if (!e)
> + return 0;
> + fnd_clear(fnd);
> + fnd->root_de = e;
> + } else if (!level) {
> + if (de_is_last(fnd->root_de)) {
> + *entry = NULL;
> + return 0;
> + }
> +
> + e = hdr_next_de(&root->ihdr, fnd->root_de);
> + if (!e)
> + return -EINVAL;
> + fnd->root_de = e;
> + } else {
> + n = fnd->nodes[level - 1];
> + e = fnd->de[level - 1];
> +
> + if (de_is_last(e))
> + goto pop_level;
> +
> + e = hdr_next_de(&n->index->ihdr, e);
> + if (!e)
> + return -EINVAL;
> +
> + fnd->de[level - 1] = e;
> + }
> +
> + /* Just to avoid tree cycle */
> +next_iter:
> + if (iter++ >= 1000)
> + return -EINVAL;
> +
> + while (de_has_vcn_ex(e)) {
> + if (le16_to_cpu(e->size) <
> + sizeof(struct NTFS_DE) + sizeof(u64)) {
> + if (n) {
> + fnd_pop(fnd);
> + ntfs_free(n);
> + }
> + return -EINVAL;
> + }
> +
> + /* Read next level */
> + err = indx_read(indx, ni, de_get_vbn(e), &n);
> + if (err)
> + return err;
> +
> + /* Try next level */
> + e = hdr_first_de(&n->index->ihdr);
> + if (!e) {
> + ntfs_free(n);
> + return -EINVAL;
> + }
> +
> + fnd_push(fnd, n, e);
> + }
> +
> + if (le16_to_cpu(e->size) > sizeof(struct NTFS_DE)) {
> + *entry = e;
> + return 0;
> + }
> +
> +pop_level:
> + for (;;) {
> + if (!de_is_last(e))
> + goto next_iter;
> +
> + /* Pop one level */
> + if (n) {
> + fnd_pop(fnd);
> + ntfs_free(n);
> + }
> +
> + level = fnd->level;
> +
> + if (level) {
> + n = fnd->nodes[level - 1];
> + e = fnd->de[level - 1];
> + } else if (fnd->root_de) {
> + n = NULL;
> + e = fnd->root_de;
> + fnd->root_de = NULL;
> + } else {
> + *entry = NULL;
> + return 0;
> + }
> +
> + if (le16_to_cpu(e->size) > sizeof(struct NTFS_DE)) {
> + *entry = e;
> + if (!fnd->root_de)
> + fnd->root_de = e;
> + return 0;
> + }
> + }
> +}
> +
> +int indx_find_raw(struct ntfs_index *indx, struct ntfs_inode *ni,
> + const struct INDEX_ROOT *root, struct NTFS_DE **entry,
> + size_t *off, struct ntfs_fnd *fnd)
> +{
> + int err;
> + struct indx_node *n = NULL;
> + struct NTFS_DE *e = NULL;
> + struct NTFS_DE *e2;
> + size_t bit;
> + CLST next_used_vbn;
> + CLST next_vbn;
> + u32 record_size = ni->mi.sbi->record_size;
> +
> + /* Use non sorted algorithm */
> + if (!*entry) {
> + /* This is the first call */
> + e = hdr_first_de(&root->ihdr);
> + if (!e)
> + return 0;
> + fnd_clear(fnd);
> + fnd->root_de = e;
> +
> + /* The first call with setup of initial element */
> + if (*off >= record_size) {
> + next_vbn = (((*off - record_size) >> indx->index_bits))
> + << indx->idx2vbn_bits;
> + /* jump inside cycle 'for'*/
> + goto next;
> + }
> +
> + /* Start enumeration from root */
> + *off = 0;
> + } else if (!fnd->root_de)
> + return -EINVAL;
> +
> + for (;;) {
> + /* Check if current entry can be used */
> + if (e && le16_to_cpu(e->size) > sizeof(struct NTFS_DE))
> + goto ok;
> +
> + if (!fnd->level) {
> + /* Continue to enumerate root */
> + if (!de_is_last(fnd->root_de)) {
> + e = hdr_next_de(&root->ihdr, fnd->root_de);
> + if (!e)
> + return -EINVAL;
> + fnd->root_de = e;
> + continue;
> + }
> +
> + /* Start to enumerate indexes from 0 */
> + next_vbn = 0;
> + } else {
> + /* Continue to enumerate indexes */
> + e2 = fnd->de[fnd->level - 1];
> +
> + n = fnd->nodes[fnd->level - 1];
> +
> + if (!de_is_last(e2)) {
> + e = hdr_next_de(&n->index->ihdr, e2);
> + if (!e)
> + return -EINVAL;
> + fnd->de[fnd->level - 1] = e;
> + continue;
> + }
> +
> + /* Continue with next index */
> + next_vbn = le64_to_cpu(n->index->vbn) +
> + root->index_block_clst;
> + }
> +
> +next:
> + /* Release current index */
> + if (n) {
> + fnd_pop(fnd);
> + put_indx_node(n);
> + n = NULL;
> + }
> +
> + /* Skip all free indexes */
> + bit = next_vbn >> indx->idx2vbn_bits;
> + err = indx_used_bit(indx, ni, &bit);
> + if (err == -ENOENT || bit == MINUS_ONE_T) {
> + /* No used indexes */
> + *entry = NULL;
> + return 0;
> + }
> +
> + next_used_vbn = bit << indx->idx2vbn_bits;
> +
> + /* Read buffer into memory */
> + err = indx_read(indx, ni, next_used_vbn, &n);
> + if (err)
> + return err;
> +
> + e = hdr_first_de(&n->index->ihdr);
> + fnd_push(fnd, n, e);
> + if (!e)
> + return -EINVAL;
> + }
> +
> +ok:
> + /* return offset to restore enumerator if necessary */
> + if (!n) {
> + /* 'e' points in root */
> + *off = PtrOffset(&root->ihdr, e);
> + } else {
> + /* 'e' points in index */
> + *off = (le64_to_cpu(n->index->vbn) << indx->vbn2vbo_bits) +
> + record_size + PtrOffset(&n->index->ihdr, e);
> + }
> +
> + *entry = e;
> + return 0;
> +}
> +
> +/*
> + * indx_create_allocate
> + *
> + * create "Allocation + Bitmap" attributes
> + */
> +static int indx_create_allocate(struct ntfs_index *indx, struct ntfs_inode *ni,
> + CLST *vbn)
> +{
> + int err = -ENOMEM;
> + struct ntfs_sb_info *sbi = ni->mi.sbi;
> + struct ATTRIB *bitmap;
> + struct ATTRIB *alloc;
> + u32 alloc_size = ntfs_up_cluster(sbi, 1u << indx->index_bits);
> + CLST len = alloc_size >> sbi->cluster_bits;
> + const struct INDEX_NAMES *in = &s_index_names[indx->type];
> + CLST alen;
> + struct runs_tree run;
> +
> + run_init(&run);
> +
> + err = attr_allocate_clusters(sbi, &run, 0, 0, len, NULL, 0, &alen, 0,
> + NULL);
> + if (err)
> + goto out;
> +
> + err = ni_insert_nonresident(ni, ATTR_ALLOC, in->name, in->name_len,
> + &run, 0, len, 0, &alloc, NULL);
> + if (err)
> + goto out1;
> +
> + err = ni_insert_resident(ni, QuadAlign(1), ATTR_BITMAP, in->name,
> + in->name_len, &bitmap, NULL);
> + if (err)
> + goto out2;
> +
> + memcpy(&indx->alloc_run, &run, sizeof(run));
> +
> + *vbn = 0;
> +
> + if (in->name == I30_NAME)
> + ni->vfs_inode.i_size = alloc_size;
> +
> + return 0;
> +
> +out2:
> + mi_remove_attr(&ni->mi, alloc);
> +
> +out1:
> + run_deallocate(sbi, &run, false);
> +
> +out:
> + return err;
> +}
> +
> +/*
> + * indx_add_allocate
> + *
> + * add clusters to index
> + */
> +static int indx_add_allocate(struct ntfs_index *indx, struct ntfs_inode *ni,
> + CLST *vbn)
> +{
> + int err;
> + size_t bit;
> + u64 data_size, alloc_size;
> + u64 bpb, vbpb;
> + struct ATTRIB *bmp, *alloc;
> + struct mft_inode *mi;
> + const struct INDEX_NAMES *in = &s_index_names[indx->type];
> +
> + err = indx_find_free(indx, ni, &bit, &bmp);
> + if (err)
> + goto out1;
> +
> + if (bit != MINUS_ONE_T) {
> + bmp = NULL;
> + } else {
> + if (bmp->non_res) {
> + bpb = le64_to_cpu(bmp->nres.data_size);
> + vbpb = le64_to_cpu(bmp->nres.valid_size);
> + } else {
> + bpb = vbpb = le32_to_cpu(bmp->res.data_size);
> + }
> +
> + /* Increase bitmap */
> + err = attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len,
> + &indx->bitmap_run, QuadAlign(bpb + 8), NULL,
> + true, NULL);
> + if (err)
> + goto out1;
> +
> + bit = bpb << 3;
> + }
> +
> + alloc = ni_find_attr(ni, NULL, NULL, ATTR_ALLOC, in->name, in->name_len,
> + NULL, &mi);
> + if (!alloc) {
> + if (bmp)
> + goto out2;
> + goto out1;
> + }
> +
> + data_size = (u64)(bit + 1) << indx->index_bits;
> + alloc_size = ntfs_up_cluster(ni->mi.sbi, data_size);
> +
> + if (alloc_size > le64_to_cpu(alloc->nres.alloc_size)) {
> + /* Increase allocation */
> + err = attr_set_size(ni, ATTR_ALLOC, in->name, in->name_len,
> + &indx->alloc_run, alloc_size, &alloc_size,
> + true, NULL);
> + if (err) {
> + if (bmp)
> + goto out2;
> + goto out1;
> + }
> +
> + if (in->name == I30_NAME)
> + ni->vfs_inode.i_size = alloc_size;
> + } else if (data_size > le64_to_cpu(alloc->nres.data_size)) {
> + alloc->nres.data_size = alloc->nres.valid_size =
> + cpu_to_le64(data_size);
> + mi->dirty = true;
> + }
> +
> + *vbn = bit << indx->idx2vbn_bits;
> +
> + return 0;
> +
> +out2:
> + /* Ops (no space?) */
> + attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len,
> + &indx->bitmap_run, bpb, &vbpb, false, NULL);
> +
> +out1:
> + return err;
> +}
> +
> +/*
> + * indx_insert_into_root
> + *
> + * attempts to insert an entry into the index root
> + * If necessary, it will twiddle the index b-tree.
> + */
> +static int indx_insert_into_root(struct ntfs_index *indx, struct ntfs_inode *ni,
> + const struct NTFS_DE *new_de,
> + struct NTFS_DE *root_de, const void *ctx,
> + struct ntfs_fnd *fnd)
> +{
> + int err = 0;
> + struct NTFS_DE *e, *e0, *re;
> + struct mft_inode *mi;
> + struct ATTRIB *attr;
> + struct MFT_REC *rec;
> + struct INDEX_HDR *hdr;
> + struct indx_node *n;
> + CLST new_vbn;
> + __le64 *sub_vbn, t_vbn;
> + u16 new_de_size;
> + u32 hdr_used, hdr_total, asize, tail, used, aoff, to_move;
> + u32 root_size, new_root_size;
> + struct ntfs_sb_info *sbi;
> + char *next;
> + int ds_root;
> + struct INDEX_ROOT *root, *a_root = NULL;
> +
> + /* Get the record this root placed in */
> + root = indx_get_root(indx, ni, &attr, &mi);
> + if (!root)
> + goto out;
> +
> + /*
> + * Try easy case:
> + * hdr_insert_de will succeed if there's room the root for the new entry.
> + */
> + hdr = &root->ihdr;
> + sbi = ni->mi.sbi;
> + rec = mi->mrec;
> + aoff = PtrOffset(rec, attr);
> + used = le32_to_cpu(rec->used);
> + new_de_size = le16_to_cpu(new_de->size);
> + hdr_used = le32_to_cpu(hdr->used);
> + hdr_total = le32_to_cpu(hdr->total);
> + asize = le32_to_cpu(attr->size);
> + next = Add2Ptr(attr, asize);
> + tail = used - aoff - asize;
> + root_size = le32_to_cpu(attr->res.data_size);
> +
> + ds_root = new_de_size + hdr_used - hdr_total;
> +
> + if (used + ds_root < sbi->max_bytes_per_attr) {
> + /* make a room for new elements */
> + memmove(next + ds_root, next, used - aoff - asize);
> + hdr->total = cpu_to_le32(hdr_total + ds_root);
> + e = hdr_insert_de(indx, hdr, new_de, root_de, ctx);
> + WARN_ON(!e);
> + fnd_clear(fnd);
> + fnd->root_de = e;
> + attr->size = cpu_to_le32(asize + ds_root);
> + attr->res.data_size = cpu_to_le32(root_size + ds_root);
> + rec->used = cpu_to_le32(used + ds_root);
> +
> + return 0;
> + }
> +
> + /* Make a copy of root attribute to restore if error */
> + a_root = ntfs_memdup(attr, asize);
> + if (!a_root) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + /* copy all the non-end entries from the index root to the new buffer.*/
> + to_move = 0;
> + e0 = hdr_first_de(hdr);
> +
> + /* Calculate the size to copy */
> + for (e = e0;; e = hdr_next_de(hdr, e)) {
> + if (!e) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (de_is_last(e))
> + break;
> + to_move += le16_to_cpu(e->size);
> + }
> +
> + n = NULL;
> + if (!to_move) {
> + re = NULL;
> + } else {
> + re = ntfs_memdup(e0, to_move);
> + if (!re) {
> + err = -ENOMEM;
> + goto out;
> + }
> + }
> +
> + sub_vbn = NULL;
> + if (de_has_vcn(e)) {
> + t_vbn = de_get_vbn_le(e);
> + sub_vbn = &t_vbn;
> + }
> +
> + new_root_size = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE) +
> + sizeof(u64);
> + ds_root = new_root_size - root_size;
> +
> + if (ds_root > 0 && used + ds_root > sbi->max_bytes_per_attr) {
> + /* make root external */
> + err = -EOPNOTSUPP;
> + goto out;
> + }
> +
> + if (ds_root) {
> + memmove(next + ds_root, next, tail);
> + used += ds_root;
> + asize += ds_root;
> + rec->used = cpu_to_le32(used);
> + attr->size = cpu_to_le32(asize);
> + attr->res.data_size = cpu_to_le32(new_root_size);
> + mi->dirty = true;
> + }
> +
> + /* Fill first entry (vcn will be set later) */
> + e = (struct NTFS_DE *)(root + 1);
> + memset(e, 0, sizeof(struct NTFS_DE));
> + e->size = cpu_to_le16(sizeof(struct NTFS_DE) + sizeof(u64));
> + e->flags = NTFS_IE_HAS_SUBNODES | NTFS_IE_LAST;
> +
> + hdr->flags = 1;
> + hdr->used = hdr->total =
> + cpu_to_le32(new_root_size - offsetof(struct INDEX_ROOT, ihdr));
> +
> + fnd->root_de = hdr_first_de(hdr);
> +
> + /* Create alloc and bitmap attributes (if not) */
> + if (run_is_empty(&indx->alloc_run)) {
> + err = indx_create_allocate(indx, ni, &new_vbn);
> + if (err) {
> + /* restore root after 'indx_create_allocate' */
> + memmove(next - ds_root, next, tail);
> + used -= ds_root;
> + rec->used = cpu_to_le32(used);
> + memcpy(attr, a_root, asize);
> + goto out1;
> + }
> + } else {
> + err = indx_add_allocate(indx, ni, &new_vbn);
> + if (err)
> + goto out1;
> + }
> +
> + root = indx_get_root(indx, ni, &attr, &mi);
> + if (!root) {
> + err = -EINVAL;
> + goto out1;
> + }
> +
> + e = (struct NTFS_DE *)(root + 1);
> + *(__le64 *)(e + 1) = cpu_to_le64(new_vbn);
> +
> + /* now we can create/format the new buffer and copy the entries into */
> + n = indx_new(indx, ni, new_vbn, sub_vbn);
> + if (IS_ERR(n)) {
> + err = PTR_ERR(n);
> + goto out1;
> + }
> +
> + hdr = &n->index->ihdr;
> + hdr_used = le32_to_cpu(hdr->used);
> + hdr_total = le32_to_cpu(hdr->total);
> +
> + /* Copy root entries into new buffer */
> + hdr_insert_head(hdr, re, to_move);
> +
> + /* Update bitmap attribute */
> + indx_mark_used(indx, ni, new_vbn >> indx->idx2vbn_bits);
> +
> + /* Check if we can insert new entry new index buffer */
> + if (hdr_used + new_de_size > hdr_total) {
> + /*
> + * This occurs if mft record is the same or bigger than index
> + * buffer. Move all root new index and have no space to add
> + * new entry classic case when mft record is 1K and index
> + * buffer 4K the problem should not occurs
> + */
> + ntfs_free(re);
> + indx_write(indx, ni, n, 0);
> +
> + put_indx_node(n);
> + fnd_clear(fnd);
> + err = indx_insert_entry(indx, ni, new_de, ctx, fnd);
> + goto out;
> + }
> +
> + /*
> + * Now root is a parent for new index buffer
> + * Insert NewEntry a new buffer
> + */
> + e = hdr_insert_de(indx, hdr, new_de, NULL, ctx);
> + if (!e) {
> + err = -EINVAL;
> + goto out1;
> + }
> + fnd_push(fnd, n, e);
> +
> + /* Just write updates index into disk */
> + indx_write(indx, ni, n, 0);
> +
> + n = NULL;
> +
> +out1:
> + ntfs_free(re);
> + if (n)
> + put_indx_node(n);
> +
> +out:
> + ntfs_free(a_root);
> + return err;
> +}
> +
> +/*
> + * indx_insert_into_buffer
> + *
> + * attempts to insert an entry into an Index Allocation Buffer.
> + * If necessary, it will split the buffer.
> + */
> +static int
> +indx_insert_into_buffer(struct ntfs_index *indx, struct ntfs_inode *ni,
> + struct INDEX_ROOT *root, const struct NTFS_DE *new_de,
> + const void *ctx, int level, struct ntfs_fnd *fnd)
> +{
> + int err;
> + const struct NTFS_DE *sp;
> + struct NTFS_DE *e, *de_t, *up_e = NULL;
> + struct indx_node *n2 = NULL;
> + struct indx_node *n1 = fnd->nodes[level];
> + struct INDEX_HDR *hdr1 = &n1->index->ihdr;
> + struct INDEX_HDR *hdr2;
> + u32 to_copy, used;
> + CLST new_vbn;
> + __le64 t_vbn, *sub_vbn;
> + u16 sp_size;
> +
> + /* Try the most easy case */
> + e = fnd->level - 1 == level ? fnd->de[level] : NULL;
> + e = hdr_insert_de(indx, hdr1, new_de, e, ctx);
> + fnd->de[level] = e;
> + if (e) {
> + /* Just write updated index into disk */
> + indx_write(indx, ni, n1, 0);
> + return 0;
> + }
> +
> + /*
> + * No space to insert into buffer. Split it.
> + * To split we:
> + * - Save split point ('cause index buffers will be changed)
> + * - Allocate NewBuffer and copy all entries <= sp into new buffer
> + * - Remove all entries (sp including) from TargetBuffer
> + * - Insert NewEntry into left or right buffer (depending on sp <=>
> + * NewEntry)
> + * - Insert sp into parent buffer (or root)
> + * - Make sp a parent for new buffer
> + */
> + sp = hdr_find_split(hdr1);
> + if (!sp)
> + return -EINVAL;
> +
> + sp_size = le16_to_cpu(sp->size);
> + up_e = ntfs_alloc(sp_size + sizeof(u64), 0);
> + if (!up_e)
> + return -ENOMEM;
> + memcpy(up_e, sp, sp_size);
> +
> + if (!hdr1->flags) {
> + up_e->flags |= NTFS_IE_HAS_SUBNODES;
> + up_e->size = cpu_to_le16(sp_size + sizeof(u64));
> + sub_vbn = NULL;
> + } else {
> + t_vbn = de_get_vbn_le(up_e);
> + sub_vbn = &t_vbn;
> + }
> +
> + /* Allocate on disk a new index allocation buffer. */
> + err = indx_add_allocate(indx, ni, &new_vbn);
> + if (err)
> + goto out;
> +
> + /* Allocate and format memory a new index buffer */
> + n2 = indx_new(indx, ni, new_vbn, sub_vbn);
> + if (IS_ERR(n2)) {
> + err = PTR_ERR(n2);
> + goto out;
> + }
> +
> + hdr2 = &n2->index->ihdr;
> +
> + /* Make sp a parent for new buffer */
> + de_set_vbn(up_e, new_vbn);
> +
> + /* copy all the entries <= sp into the new buffer. */
> + de_t = hdr_first_de(hdr1);
> + to_copy = PtrOffset(de_t, sp);
> + hdr_insert_head(hdr2, de_t, to_copy);
> +
> + /* remove all entries (sp including) from hdr1 */
> + used = le32_to_cpu(hdr1->used) - to_copy - sp_size;
> + memmove(de_t, Add2Ptr(sp, sp_size), used - le32_to_cpu(hdr1->de_off));
> + hdr1->used = cpu_to_le32(used);
> +
> + /* Insert new entry into left or right buffer (depending on sp <=> new_de) */
> + hdr_insert_de(indx,
> + (*indx->cmp)(new_de + 1, le16_to_cpu(new_de->key_size),
> + up_e + 1, le16_to_cpu(up_e->key_size),
> + ctx) < 0 ?
> + hdr2 :
> + hdr1,
> + new_de, NULL, ctx);
> +
> + indx_mark_used(indx, ni, new_vbn >> indx->idx2vbn_bits);
> +
> + indx_write(indx, ni, n1, 0);
> + indx_write(indx, ni, n2, 0);
> +
> + put_indx_node(n2);
> +
> + /*
> + * we've finished splitting everybody, so we are ready to
> + * insert the promoted entry into the parent.
> + */
> + if (!level) {
> + /* Insert in root */
> + err = indx_insert_into_root(indx, ni, up_e, NULL, ctx, fnd);
> + if (err)
> + goto out;
> + } else {
> + /*
> + * The target buffer's parent is another index buffer
> + * TODO: Remove recursion
> + */
> + err = indx_insert_into_buffer(indx, ni, root, up_e, ctx,
> + level - 1, fnd);
> + if (err)
> + goto out;
> + }
> +
> +out:
> + ntfs_free(up_e);
> +
> + return err;
> +}
> +
> +/*
> + * indx_insert_entry
> + *
> + * inserts new entry into index
> + */
> +int indx_insert_entry(struct ntfs_index *indx, struct ntfs_inode *ni,
> + const struct NTFS_DE *new_de, const void *ctx,
> + struct ntfs_fnd *fnd)
> +{
> + int err;
> + int diff;
> + struct NTFS_DE *e;
> + struct ntfs_fnd *fnd_a = NULL;
> + struct INDEX_ROOT *root;
> +
> + if (!fnd) {
> + fnd_a = fnd_get(indx);
> + if (!fnd_a) {
> + err = -ENOMEM;
> + goto out1;
> + }
> + fnd = fnd_a;
> + }
> +
> + root = indx_get_root(indx, ni, NULL, NULL);
> + if (!root) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (fnd_is_empty(fnd)) {
> + /* Find the spot the tree where we want to insert the new entry. */
> + err = indx_find(indx, ni, root, new_de + 1,
> + le16_to_cpu(new_de->key_size), ctx, &diff, &e,
> + fnd);
> + if (err)
> + goto out;
> +
> + if (!diff) {
> + err = -EEXIST;
> + goto out;
> + }
> + }
> +
> + if (!fnd->level) {
> + /* The root is also a leaf, so we'll insert the new entry into it. */
> + err = indx_insert_into_root(indx, ni, new_de, fnd->root_de, ctx,
> + fnd);
> + if (err)
> + goto out;
> + } else {
> + /* found a leaf buffer, so we'll insert the new entry into it.*/
> + err = indx_insert_into_buffer(indx, ni, root, new_de, ctx,
> + fnd->level - 1, fnd);
> + if (err)
> + goto out;
> + }
> +
> +out:
> + indx->changed = true;
> + fnd_put(fnd_a);
> +out1:
> +
> + return err;
> +}
> +
> +/*
> + * indx_find_buffer
> + *
> + * locates a buffer the tree.
> + */
> +static struct indx_node *indx_find_buffer(struct ntfs_index *indx,
> + struct ntfs_inode *ni,
> + const struct INDEX_ROOT *root,
> + __le64 vbn, struct indx_node *n)
> +{
> + int err;
> + const struct NTFS_DE *e;
> + struct indx_node *r;
> + const struct INDEX_HDR *hdr = n ? &n->index->ihdr : &root->ihdr;
> +
> + /* Step 1: Scan one level */
> + for (e = hdr_first_de(hdr);; e = hdr_next_de(hdr, e)) {
> + if (!e)
> + return ERR_PTR(-EINVAL);
> +
> + if (de_has_vcn(e) && vbn == de_get_vbn_le(e))
> + return n;
> +
> + if (de_is_last(e))
> + break;
> + }
> +
> + /* Step2: Do recursion */
> + e = Add2Ptr(hdr, le32_to_cpu(hdr->de_off));
> + for (;;) {
> + if (de_has_vcn_ex(e)) {
> + err = indx_read(indx, ni, de_get_vbn(e), &n);
> + if (err)
> + return ERR_PTR(err);
> +
> + r = indx_find_buffer(indx, ni, root, vbn, n);
> + if (r)
> + return r;
> + }
> +
> + if (de_is_last(e))
> + break;
> +
> + e = Add2Ptr(e, le16_to_cpu(e->size));
> + }
> +
> + return NULL;
> +}
> +
> +/*
> + * indx_shrink
> + *
> + * deallocates unused tail indexes
> + */
> +static int indx_shrink(struct ntfs_index *indx, struct ntfs_inode *ni,
> + size_t bit)
> +{
> + int err = 0;
> + u64 bpb, new_alloc;
> + size_t nbits;
> + struct ATTRIB *b;
> + struct ATTR_LIST_ENTRY *le = NULL;
> + const struct INDEX_NAMES *in = &s_index_names[indx->type];
> +
> + b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len,
> + NULL, NULL);
> +
> + if (!b)
> + return -ENOENT;
> +
> + if (!b->non_res) {
> + unsigned long pos;
> + const unsigned long *bm = resident_data(b);
> +
> + nbits = le32_to_cpu(b->res.data_size) * 8;
> +
> + if (bit >= nbits)
> + return 0;
> +
> + pos = find_next_bit(bm, nbits, bit);
> + if (pos < nbits)
> + return 0;
> + } else {
> + size_t used = MINUS_ONE_T;
> +
> + nbits = le64_to_cpu(b->nres.data_size) * 8;
> +
> + if (bit >= nbits)
> + return 0;
> +
> + err = scan_nres_bitmap(ni->mi.sbi, b, &indx->bitmap_run, bit,
> + &scan_for_used, &used);
> + if (err)
> + return err;
> +
> + if (used != MINUS_ONE_T)
> + return 0;
> + }
> +
> + new_alloc = (u64)bit << indx->index_bits;
> +
> + err = attr_set_size(ni, ATTR_ALLOC, in->name, in->name_len,
> + &indx->alloc_run, new_alloc, &new_alloc, false,
> + NULL);
> + if (err)
> + return err;
> +
> + if (in->name == I30_NAME)
> + ni->vfs_inode.i_size = new_alloc;
> +
> + bpb = bitmap_size(bit);
> + if (bpb * 8 == nbits)
> + return 0;
> +
> + err = attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len,
> + &indx->bitmap_run, bpb, &bpb, false, NULL);
> +
> + return err;
> +}
> +
> +static int indx_free_children(struct ntfs_index *indx, struct ntfs_inode *ni,
> + const struct NTFS_DE *e, bool trim)
> +{
> + int err;
> + struct indx_node *n;
> + struct INDEX_HDR *hdr;
> + CLST vbn = de_get_vbn(e);
> + size_t i;
> +
> + err = indx_read(indx, ni, vbn, &n);
> + if (err)
> + return err;
> +
> + hdr = &n->index->ihdr;
> + /* First, recurse into the children, if any.*/
> + if (hdr_has_subnode(hdr)) {
> + for (e = hdr_first_de(hdr); e; e = hdr_next_de(hdr, e)) {
> + indx_free_children(indx, ni, e, false);
> + if (de_is_last(e))
> + break;
> + }
> + }
> +
> + put_indx_node(n);
> +
> + i = vbn >> indx->idx2vbn_bits;
> + /* We've gotten rid of the children; add this buffer to the free list. */
> + indx_mark_free(indx, ni, i);
> +
> + if (!trim)
> + return 0;
> +
> + /*
> + * If there are no used indexes after current free index
> + * then we can truncate allocation and bitmap
> + * Use bitmap to estimate the case
> + */
> + indx_shrink(indx, ni, i + 1);
> + return 0;
> +}
> +
> +/*
> + * indx_get_entry_to_replace
> + *
> + * finds a replacement entry for a deleted entry
> + * always returns a node entry:
> + * NTFS_IE_HAS_SUBNODES is set the flags and the size includes the sub_vcn
> + */
> +static int indx_get_entry_to_replace(struct ntfs_index *indx,
> + struct ntfs_inode *ni,
> + const struct NTFS_DE *de_next,
> + struct NTFS_DE **de_to_replace,
> + struct ntfs_fnd *fnd)
> +{
> + int err;
> + int level = -1;
> + CLST vbn;
> + struct NTFS_DE *e, *te, *re;
> + struct indx_node *n;
> + struct INDEX_BUFFER *ib;
> +
> + *de_to_replace = NULL;
> +
> + /* Find first leaf entry down from de_next */
> + vbn = de_get_vbn(de_next);
> + for (;;) {
> + n = NULL;
> + err = indx_read(indx, ni, vbn, &n);
> + if (err)
> + goto out;
> +
> + e = hdr_first_de(&n->index->ihdr);
> + fnd_push(fnd, n, e);
> +
> + if (!de_is_last(e)) {
> + /*
> + * This buffer is non-empty, so its first entry could be used as the
> + * replacement entry.
> + */
> + level = fnd->level - 1;
> + }
> +
> + if (!de_has_vcn(e))
> + break;
> +
> + /* This buffer is a node. Continue to go down */
> + vbn = de_get_vbn(e);
> + }
> +
> + if (level == -1)
> + goto out;
> +
> + n = fnd->nodes[level];
> + te = hdr_first_de(&n->index->ihdr);
> + /* Copy the candidate entry into the replacement entry buffer. */
> + re = ntfs_alloc(le16_to_cpu(te->size) + sizeof(u64), 0);
> + if (!re) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + *de_to_replace = re;
> + memcpy(re, te, le16_to_cpu(te->size));
> +
> + if (!de_has_vcn(re)) {
> + /*
> + * The replacement entry we found doesn't have a sub_vcn. increase its size
> + * to hold one.
> + */
> + le16_add_cpu(&re->size, sizeof(u64));
> + re->flags |= NTFS_IE_HAS_SUBNODES;
> + } else {
> + /*
> + * The replacement entry we found was a node entry, which means that all
> + * its child buffers are empty. Return them to the free pool.
> + */
> + indx_free_children(indx, ni, te, true);
> + }
> +
> + /*
> + * Expunge the replacement entry from its former location,
> + * and then write that buffer.
> + */
> + ib = n->index;
> + e = hdr_delete_de(&ib->ihdr, te);
> +
> + fnd->de[level] = e;
> + indx_write(indx, ni, n, 0);
> +
> + /* Check to see if this action created an empty leaf. */
> + if (ib_is_leaf(ib) && ib_is_empty(ib))
> + return 0;
> +
> +out:
> + fnd_clear(fnd);
> +
> + return err;
> +}
> +
> +/*
> + * indx_delete_entry
> + *
> + * deletes an entry from the index.
> + */
> +int indx_delete_entry(struct ntfs_index *indx, struct ntfs_inode *ni,
> + const void *key, u32 key_len, const void *ctx)
> +{
> + int err, diff;
> + struct INDEX_ROOT *root;
> + struct INDEX_HDR *hdr;
> + struct ntfs_fnd *fnd, *fnd2;
> + struct INDEX_BUFFER *ib;
> + struct NTFS_DE *e, *re, *next, *prev, *me;
> + struct indx_node *n, *n2d = NULL;
> + __le64 sub_vbn;
> + int level, level2;
> + struct ATTRIB *attr;
> + struct mft_inode *mi;
> + u32 e_size, root_size, new_root_size;
> + size_t trim_bit;
> + const struct INDEX_NAMES *in;
> +
> + fnd = fnd_get(indx);
> + if (!fnd) {
> + err = -ENOMEM;
> + goto out2;
> + }
> +
> + fnd2 = fnd_get(NULL);
> + if (!fnd2) {
> + err = -ENOMEM;
> + goto out1;
> + }
> +
> + root = indx_get_root(indx, ni, &attr, &mi);
> + if (!root) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + /* Locate the entry to remove. */
> + err = indx_find(indx, ni, root, key, key_len, ctx, &diff, &e, fnd);
> + if (err)
> + goto out;
> +
> + if (!e || diff) {
> + err = -ENOENT;
> + goto out;
> + }
> +
> + level = fnd->level;
> +
> + if (level) {
> + n = fnd->nodes[level - 1];
> + e = fnd->de[level - 1];
> + ib = n->index;
> + hdr = &ib->ihdr;
> + } else {
> + hdr = &root->ihdr;
> + e = fnd->root_de;
> + n = NULL;
> + }
> +
> + e_size = le16_to_cpu(e->size);
> +
> + if (!de_has_vcn_ex(e)) {
> + /* The entry to delete is a leaf, so we can just rip it out */
> + hdr_delete_de(hdr, e);
> +
> + if (!level) {
> + hdr->total = hdr->used;
> +
> + /* Shrink resident root attribute */
> + mi_resize_attr(mi, attr, 0 - e_size);
> + goto out;
> + }
> +
> + indx_write(indx, ni, n, 0);
> +
> + /*
> + * Check to see if removing that entry made
> + * the leaf empty.
> + */
> + if (ib_is_leaf(ib) && ib_is_empty(ib)) {
> + fnd_pop(fnd);
> + fnd_push(fnd2, n, e);
> + }
> + } else {
> + /*
> + * The entry we wish to delete is a node buffer, so we
> + * have to find a replacement for it.
> + */
> + next = de_get_next(e);
> +
> + err = indx_get_entry_to_replace(indx, ni, next, &re, fnd2);
> + if (err)
> + goto out;
> +
> + if (re) {
> + de_set_vbn_le(re, de_get_vbn_le(e));
> + hdr_delete_de(hdr, e);
> +
> + err = level ? indx_insert_into_buffer(indx, ni, root,
> + re, ctx,
> + fnd->level - 1,
> + fnd) :
> + indx_insert_into_root(indx, ni, re, e,
> + ctx, fnd);
> + ntfs_free(re);
> +
> + if (err)
> + goto out;
> + } else {
> + /*
> + * There is no replacement for the current entry.
> + * This means that the subtree rooted at its node is empty,
> + * and can be deleted, which turn means that the node can
> + * just inherit the deleted entry sub_vcn
> + */
> + indx_free_children(indx, ni, next, true);
> +
> + de_set_vbn_le(next, de_get_vbn_le(e));
> + hdr_delete_de(hdr, e);
> + if (level) {
> + indx_write(indx, ni, n, 0);
> + } else {
> + hdr->total = hdr->used;
> +
> + /* Shrink resident root attribute */
> + mi_resize_attr(mi, attr, 0 - e_size);
> + }
> + }
> + }
> +
> + /* Delete a branch of tree */
> + if (!fnd2 || !fnd2->level)
> + goto out;
> +
> + /* Reinit root 'cause it can be changed */
> + root = indx_get_root(indx, ni, &attr, &mi);
> + if (!root) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + n2d = NULL;
> + sub_vbn = fnd2->nodes[0]->index->vbn;
> + level2 = 0;
> + level = fnd->level;
> +
> + hdr = level ? &fnd->nodes[level - 1]->index->ihdr : &root->ihdr;
> +
> + /* Scan current level */
> + for (e = hdr_first_de(hdr);; e = hdr_next_de(hdr, e)) {
> + if (!e) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (de_has_vcn(e) && sub_vbn == de_get_vbn_le(e))
> + break;
> +
> + if (de_is_last(e)) {
> + e = NULL;
> + break;
> + }
> + }
> +
> + if (!e) {
> + /* Do slow search from root */
> + struct indx_node *in;
> +
> + fnd_clear(fnd);
> +
> + in = indx_find_buffer(indx, ni, root, sub_vbn, NULL);
> + if (IS_ERR(in)) {
> + err = PTR_ERR(in);
> + goto out;
> + }
> +
> + if (in)
> + fnd_push(fnd, in, NULL);
> + }
> +
> + /* Merge fnd2 -> fnd */
> + for (level = 0; level < fnd2->level; level++) {
> + fnd_push(fnd, fnd2->nodes[level], fnd2->de[level]);
> + fnd2->nodes[level] = NULL;
> + }
> + fnd2->level = 0;
> +
> + hdr = NULL;
> + for (level = fnd->level; level; level--) {
> + struct indx_node *in = fnd->nodes[level - 1];
> +
> + ib = in->index;
> + if (ib_is_empty(ib)) {
> + sub_vbn = ib->vbn;
> + } else {
> + hdr = &ib->ihdr;
> + n2d = in;
> + level2 = level;
> + break;
> + }
> + }
> +
> + if (!hdr)
> + hdr = &root->ihdr;
> +
> + e = hdr_first_de(hdr);
> + if (!e) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (hdr != &root->ihdr || !de_is_last(e)) {
> + prev = NULL;
> + while (!de_is_last(e)) {
> + if (de_has_vcn(e) && sub_vbn == de_get_vbn_le(e))
> + break;
> + prev = e;
> + e = hdr_next_de(hdr, e);
> + if (!e) {
> + err = -EINVAL;
> + goto out;
> + }
> + }
> +
> + if (sub_vbn != de_get_vbn_le(e)) {
> + /*
> + * Didn't find the parent entry, although this buffer is the parent trail.
> + * Something is corrupt.
> + */
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (de_is_last(e)) {
> + /*
> + * Since we can't remove the end entry, we'll remove its
> + * predecessor instead. This means we have to transfer the
> + * predecessor's sub_vcn to the end entry.
> + * Note: that this index block is not empty, so the
> + * predecessor must exist
> + */
> + if (!prev) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (de_has_vcn(prev)) {
> + de_set_vbn_le(e, de_get_vbn_le(prev));
> + } else if (de_has_vcn(e)) {
> + le16_sub_cpu(&e->size, sizeof(u64));
> + e->flags &= ~NTFS_IE_HAS_SUBNODES;
> + le32_sub_cpu(&hdr->used, sizeof(u64));
> + }
> + e = prev;
> + }
> +
> + /*
> + * Copy the current entry into a temporary buffer (stripping off its
> + * down-pointer, if any) and delete it from the current buffer or root,
> + * as appropriate.
> + */
> + e_size = le16_to_cpu(e->size);
> + me = ntfs_memdup(e, e_size);
> + if (!me) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + if (de_has_vcn(me)) {
> + me->flags &= ~NTFS_IE_HAS_SUBNODES;
> + le16_sub_cpu(&me->size, sizeof(u64));
> + }
> +
> + hdr_delete_de(hdr, e);
> +
> + if (hdr == &root->ihdr) {
> + level = 0;
> + hdr->total = hdr->used;
> +
> + /* Shrink resident root attribute */
> + mi_resize_attr(mi, attr, 0 - e_size);
> + } else {
> + indx_write(indx, ni, n2d, 0);
> + level = level2;
> + }
> +
> + /* Mark unused buffers as free */
> + trim_bit = -1;
> + for (; level < fnd->level; level++) {
> + ib = fnd->nodes[level]->index;
> + if (ib_is_empty(ib)) {
> + size_t k = le64_to_cpu(ib->vbn) >>
> + indx->idx2vbn_bits;
> +
> + indx_mark_free(indx, ni, k);
> + if (k < trim_bit)
> + trim_bit = k;
> + }
> + }
> +
> + fnd_clear(fnd);
> + /*fnd->root_de = NULL;*/
> +
> + /*
> + * Re-insert the entry into the tree.
> + * Find the spot the tree where we want to insert the new entry.
> + */
> + err = indx_insert_entry(indx, ni, me, ctx, fnd);
> + ntfs_free(me);
> + if (err)
> + goto out;
> +
> + if (trim_bit != -1)
> + indx_shrink(indx, ni, trim_bit);
> + } else {
> + /*
> + * This tree needs to be collapsed down to an empty root.
> + * Recreate the index root as an empty leaf and free all the bits the
> + * index allocation bitmap.
> + */
> + fnd_clear(fnd);
> + fnd_clear(fnd2);
> +
> + in = &s_index_names[indx->type];
> +
> + err = attr_set_size(ni, ATTR_ALLOC, in->name, in->name_len,
> + &indx->alloc_run, 0, NULL, false, NULL);
> + err = ni_remove_attr(ni, ATTR_ALLOC, in->name, in->name_len,
> + false, NULL);
> + run_close(&indx->alloc_run);
> +
> + err = attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len,
> + &indx->bitmap_run, 0, NULL, false, NULL);
> + err = ni_remove_attr(ni, ATTR_BITMAP, in->name, in->name_len,
> + false, NULL);
> + run_close(&indx->bitmap_run);
> +
> + root = indx_get_root(indx, ni, &attr, &mi);
> + if (!root) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + root_size = le32_to_cpu(attr->res.data_size);
> + new_root_size =
> + sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
> +
> + if (new_root_size != root_size &&
> + !mi_resize_attr(mi, attr, new_root_size - root_size)) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + /* Fill first entry */
> + e = (struct NTFS_DE *)(root + 1);
> + e->ref.low = 0;
> + e->ref.high = 0;
> + e->ref.seq = 0;
> + e->size = cpu_to_le16(sizeof(struct NTFS_DE));
> + e->flags = NTFS_IE_LAST; // 0x02
> + e->key_size = 0;
> + e->res = 0;
> +
> + hdr = &root->ihdr;
> + hdr->flags = 0;
> + hdr->used = hdr->total = cpu_to_le32(
> + new_root_size - offsetof(struct INDEX_ROOT, ihdr));
> + mi->dirty = true;
> +
> + if (in->name == I30_NAME)
> + ni->vfs_inode.i_size = 0;
> + }
> +
> +out:
> + fnd_put(fnd2);
> +out1:
> + indx->changed = true;
> + fnd_put(fnd);
> +
> +out2:
> + return err;
> +}
> +
> +int indx_update_dup(struct ntfs_inode *ni, struct ntfs_sb_info *sbi,
> + const struct ATTR_FILE_NAME *fname,
> + const struct NTFS_DUP_INFO *dup, int sync)
> +{
> + int err, diff;
> + struct NTFS_DE *e = NULL;
> + struct ATTR_FILE_NAME *e_fname;
> + struct ntfs_fnd *fnd;
> + struct INDEX_ROOT *root;
> + struct mft_inode *mi;
> + struct ntfs_index *indx = &ni->dir;
> +
> + fnd = fnd_get(indx);
> + if (!fnd) {
> + err = -ENOMEM;
> + goto out1;
> + }
> +
> + root = indx_get_root(indx, ni, NULL, &mi);
> + if (!root) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + /* Find entries tree and on disk */
> + err = indx_find(indx, ni, root, fname, fname_full_size(fname), sbi,
> + &diff, &e, fnd);
> + if (err)
> + goto out;
> +
> + if (!e) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (diff) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + e_fname = (struct ATTR_FILE_NAME *)(e + 1);
> +
> + if (!memcmp(&e_fname->dup, dup, sizeof(*dup))) {
> + /* nothing to update in index! Try to avoid this call */
> + goto out;
> + }
> +
> + memcpy(&e_fname->dup, dup, sizeof(*dup));
> +
> + if (fnd->level) {
> + err = indx_write(indx, ni, fnd->nodes[fnd->level - 1], sync);
> + } else if (sync) {
> + mi->dirty = true;
> + err = mi_write(mi, 1);
> + } else {
> + mi->dirty = true;
> + mark_inode_dirty(&ni->vfs_inode);
> + }
> +
> +out:
> + fnd_put(fnd);
> +
> +out1:
> + return err;
> +}
> diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c
> new file mode 100644
> index 000000000000..5de85b7f909d
> --- /dev/null
> +++ b/fs/ntfs3/inode.c
> @@ -0,0 +1,1998 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * linux/fs/ntfs3/inode.c
> + *
> + * Copyright (C) 2019-2020 Paragon Software GmbH, All rights reserved.
> + *
> + */
> +
> +#include <linux/blkdev.h>
> +#include <linux/buffer_head.h>
> +#include <linux/fs.h>
> +#include <linux/iversion.h>
> +#include <linux/mpage.h>
> +#include <linux/nls.h>
> +#include <linux/uio.h>
> +#include <linux/version.h>
> +#include <linux/writeback.h>
> +
> +#include "debug.h"
> +#include "ntfs.h"
> +#include "ntfs_fs.h"
> +
> +/*
> + * ntfs_read_mft
> + *
> + * reads record and parses MFT
> + */
> +static struct inode *ntfs_read_mft(struct inode *inode,
> + const struct cpu_str *name,
> + const struct MFT_REF *ref)
> +{
> + int err = 0;
> + struct ntfs_inode *ni = ntfs_i(inode);
> + struct super_block *sb = inode->i_sb;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + mode_t mode = 0;
> + struct ATTR_STD_INFO5 *std5 = NULL;
> + struct ATTR_LIST_ENTRY *le;
> + struct ATTRIB *attr;
> + bool is_match = false;
> + bool is_root = false;
> + bool is_dir;
> + unsigned long ino = inode->i_ino;
> + u32 rp_fa = 0, asize, t32;
> + u16 roff, rsize, names = 0;
> + const struct ATTR_FILE_NAME *fname = NULL;
> + const struct INDEX_ROOT *root;
> + struct REPARSE_DATA_BUFFER rp; // 0x18 bytes
> + u64 t64;
> + struct MFT_REC *rec;
> + struct runs_tree *run;
> +
> + inode->i_op = NULL;
> +
> + err = mi_init(&ni->mi, sbi, ino);
> + if (err)
> + goto out;
> +
> + if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
> + t64 = sbi->mft.lbo >> sbi->cluster_bits;
> + t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size);
> + sbi->mft.ni = ni;
> + init_rwsem(&ni->file.run_lock);
> +
> + if (!run_add_entry(&ni->file.run, 0, t64, t32)) {
> + err = -ENOMEM;
> + goto out;
> + }
> + }
> +
> + err = mi_read(&ni->mi, ino == MFT_REC_MFT);
> +
> + if (err)
> + goto out;
> +
> + rec = ni->mi.mrec;
> +
> + if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) {
> + ;
> + } else if (ref->seq != rec->seq) {
> + err = -EINVAL;
> + ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino,
> + le16_to_cpu(ref->seq), le16_to_cpu(rec->seq));
> + goto out;
> + } else if (!is_rec_inuse(rec)) {
> + err = -EINVAL;
> + ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino);
> + goto out;
> + }
> +
> + if (le32_to_cpu(rec->total) != sbi->record_size) {
> + // bad inode?
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (!is_rec_base(rec))
> + goto Ok;
> +
> + /* record should contain $I30 root */
> + is_dir = rec->flags & RECORD_FLAG_DIR;
> +
> + inode->i_generation = le16_to_cpu(rec->seq);
> +
> + /* Enumerate all struct Attributes MFT */
> + le = NULL;
> + attr = NULL;
> +
> + /*
> + * to reduce tab pressure use goto instead of
> + * while( (attr = ni_enum_attr_ex(ni, attr, &le) ))
> + */
> +next_attr:
> + run = NULL;
> + err = -EINVAL;
> + attr = ni_enum_attr_ex(ni, attr, &le);
> + if (!attr)
> + goto end_enum;
> +
> + if (le && le->vcn) {
> + /* This is non primary attribute segment. Ignore if not MFT */
> + if (ino != MFT_REC_MFT || attr->type != ATTR_DATA)
> + goto next_attr;
> +
> + run = &ni->file.run;
> + asize = le32_to_cpu(attr->size);
> + goto attr_unpack_run;
> + }
> +
> + roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off);
> + rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size);
> + asize = le32_to_cpu(attr->size);
> +
> + switch (attr->type) {
> + case ATTR_STD:
> + if (attr->non_res ||
> + asize < sizeof(struct ATTR_STD_INFO) + roff ||
> + rsize < sizeof(struct ATTR_STD_INFO))
> + goto out;
> +
> + if (std5)
> + goto next_attr;
> +
> + std5 = Add2Ptr(attr, roff);
> +
> +#ifdef STATX_BTIME
> + nt2kernel(std5->cr_time, &ni->i_crtime);
> +#endif
> + nt2kernel(std5->a_time, &inode->i_atime);
> + nt2kernel(std5->c_time, &inode->i_ctime);
> + nt2kernel(std5->m_time, &inode->i_mtime);
> +
> + ni->std_fa = std5->fa;
> +
> + if (asize >= sizeof(struct ATTR_STD_INFO5) + roff &&
> + rsize >= sizeof(struct ATTR_STD_INFO5))
> + ni->std_security_id = std5->security_id;
> + goto next_attr;
> +
> + case ATTR_LIST:
> + if (attr->name_len || le || ino == MFT_REC_LOG)
> + goto out;
> +
> + err = ntfs_load_attr_list(ni, attr);
> + if (err)
> + goto out;
> +
> + le = NULL;
> + attr = NULL;
> + goto next_attr;
> +
> + case ATTR_NAME:
> + if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff ||
> + rsize < SIZEOF_ATTRIBUTE_FILENAME)
> + goto out;
> +
> + fname = Add2Ptr(attr, roff);
> + if (fname->type == FILE_NAME_DOS)
> + goto next_attr;
> +
> + names += 1;
> + if (name && name->len == fname->name_len &&
> + !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len,
> + NULL))
> + is_match = true;
> +
> + goto next_attr;
> +
> + case ATTR_DATA:
> + if (is_dir) {
> + /* ignore data attribute in dir record */
> + goto next_attr;
> + }
> +
> + if (ino == MFT_REC_BADCLUST && !attr->non_res)
> + goto next_attr;
> +
> + if (attr->name_len &&
> + ((ino != MFT_REC_BADCLUST || !attr->non_res ||
> + attr->name_len != ARRAY_SIZE(BAD_NAME) ||
> + memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) &&
> + (ino != MFT_REC_SECURE || !attr->non_res ||
> + attr->name_len != ARRAY_SIZE(SDS_NAME) ||
> + memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) {
> + /* file contains stream attribute. ignore it */
> + goto next_attr;
> + }
> +
> + if (is_attr_sparsed(attr))
> + ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE;
> + else
> + ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
> +
> + if (is_attr_compressed(attr))
> + ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED;
> + else
> + ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED;
> +
> + if (is_attr_encrypted(attr))
> + ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED;
> + else
> + ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED;
> +
> + if (!attr->non_res) {
> + ni->i_valid = inode->i_size = rsize;
> + inode_set_bytes(inode, rsize);
> + t32 = asize;
> + } else {
> + t32 = le16_to_cpu(attr->nres.run_off);
> + }
> +
> + mode = S_IFREG | (0777 & sbi->options.fs_fmask_inv);
> +
> + if (!attr->non_res) {
> + ni->ni_flags |= NI_FLAG_RESIDENT;
> + goto next_attr;
> + }
> +
> + inode_set_bytes(inode, attr_ondisk_size(attr));
> +
> + ni->i_valid = le64_to_cpu(attr->nres.valid_size);
> + inode->i_size = le64_to_cpu(attr->nres.data_size);
> + if (!attr->nres.alloc_size)
> + goto next_attr;
> +
> + run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run :
> + &ni->file.run;
> + break;
> +
> + case ATTR_ROOT:
> + if (attr->non_res)
> + goto out;
> +
> + root = Add2Ptr(attr, roff);
> + is_root = true;
> +
> + if (attr->name_len != ARRAY_SIZE(I30_NAME) ||
> + memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
> + goto next_attr;
> +
> + if (root->type != ATTR_NAME ||
> + root->rule != NTFS_COLLATION_TYPE_FILENAME)
> + goto out;
> +
> + if (!is_dir)
> + goto next_attr;
> +
> + ni->ni_flags |= NI_FLAG_DIR;
> +
> + err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
> + if (err)
> + goto out;
> +
> + mode = sb->s_root ?
> + (S_IFDIR | (0777 & sbi->options.fs_dmask_inv)) :
> + (S_IFDIR | 0777);
> + goto next_attr;
> +
> + case ATTR_ALLOC:
> + if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) ||
> + memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME)))
> + goto next_attr;
> +
> + inode->i_size = le64_to_cpu(attr->nres.data_size);
> + ni->i_valid = le64_to_cpu(attr->nres.valid_size);
> + inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size));
> +
> + run = &ni->dir.alloc_run;
> + break;
> +
> + case ATTR_BITMAP:
> + if (ino == MFT_REC_MFT) {
> + if (!attr->non_res)
> + goto out;
> +#ifndef NTFS3_64BIT_CLUSTER
> + /* 0x20000000 = 2^32 / 8 */
> + if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000)
> + goto out;
> +#endif
> + run = &sbi->mft.bitmap.run;
> + break;
> + } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) &&
> + !memcmp(attr_name(attr), I30_NAME,
> + sizeof(I30_NAME)) &&
> + attr->non_res) {
> + run = &ni->dir.bitmap_run;
> + break;
> + }
> + goto next_attr;
> +
> + case ATTR_REPARSE:
> + if (attr->name_len)
> + goto next_attr;
> +
> + rp_fa = ni_parse_reparse(ni, attr, &rp);
> + switch (rp_fa) {
> + case REPARSE_LINK:
> + if (!attr->non_res) {
> + inode->i_size = rsize;
> + inode_set_bytes(inode, rsize);
> + t32 = asize;
> + } else {
> + inode->i_size =
> + le64_to_cpu(attr->nres.data_size);
> + t32 = le16_to_cpu(attr->nres.run_off);
> + }
> +
> + /* Looks like normal symlink */
> + ni->i_valid = inode->i_size;
> +
> + /* Clear directory bit */
> + if (ni->ni_flags & NI_FLAG_DIR) {
> + indx_clear(&ni->dir);
> + memset(&ni->dir, 0, sizeof(ni->dir));
> + ni->ni_flags &= ~NI_FLAG_DIR;
> + } else {
> + run_close(&ni->file.run);
> + }
> + mode = S_IFLNK | 0777;
> + is_dir = false;
> + if (attr->non_res) {
> + run = &ni->file.run;
> + goto attr_unpack_run; // double break
> + }
> + break;
> +
> + case REPARSE_COMPRESSED:
> + break;
> +
> + case REPARSE_DEDUPLICATED:
> + break;
> + }
> + goto next_attr;
> +
> + case ATTR_EA_INFO:
> + if (!attr->name_len &&
> + resident_data_ex(attr, sizeof(struct EA_INFO)))
> + ni->ni_flags |= NI_FLAG_EA;
> + goto next_attr;
> +
> + default:
> + goto next_attr;
> + }
> +
> +attr_unpack_run:
> + roff = le16_to_cpu(attr->nres.run_off);
> +
> + err = run_unpack_ex(run, sbi, ino, le64_to_cpu(attr->nres.svcn),
> + le64_to_cpu(attr->nres.evcn), Add2Ptr(attr, roff),
> + asize - roff);
> + if (err < 0)
> + goto out;
> + err = 0;
> + goto next_attr;
> +
> +end_enum:
> +
> + if (!std5)
> + goto out;
> +
> + if (!is_match && name) {
> + /* reuse rec as buffer for ascii name */
> + err = -ENOENT;
> + goto out;
> + }
> +
> + if (std5->fa & FILE_ATTRIBUTE_READONLY)
> + mode &= ~0222;
> +
> + /* Setup 'uid' and 'gid' */
> + inode->i_uid = sbi->options.fs_uid;
> + inode->i_gid = sbi->options.fs_gid;
> +
> + if (!names) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (S_ISDIR(mode)) {
> + ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;
> +
> + /*
> + * dot and dot-dot should be included in count but was not
> + * included in enumeration.
> + * Usually a hard links to directories are disabled
> + */
> + set_nlink(inode, 1);
> + inode->i_op = &ntfs_dir_inode_operations;
> + inode->i_fop = &ntfs_dir_operations;
> + ni->i_valid = 0;
> + } else if (S_ISLNK(mode)) {
> + ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
> + inode->i_op = &ntfs_link_inode_operations;
> + inode->i_fop = NULL;
> + inode_nohighmem(inode); // ??
> + set_nlink(inode, names);
> + } else if (S_ISREG(mode)) {
> + ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
> +
> + set_nlink(inode, names);
> +
> + inode->i_op = &ntfs_file_inode_operations;
> + inode->i_fop = &ntfs_file_operations;
> + inode->i_mapping->a_ops =
> + is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
> +
> + if (ino != MFT_REC_MFT)
> + init_rwsem(&ni->file.run_lock);
> + } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
> + fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
> + /* Records in $Extend are not a files or general directories */
> + } else {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if ((sbi->options.sys_immutable &&
> + (std5->fa & FILE_ATTRIBUTE_SYSTEM)) &&
> + !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) {
> + inode->i_flags |= S_IMMUTABLE;
> + } else {
> + inode->i_flags &= ~S_IMMUTABLE;
> + }
> +
> + inode->i_mode = mode;
> +
> +Ok:
> + if (ino == MFT_REC_MFT && !sb->s_root)
> + sbi->mft.ni = NULL;
> +
> + unlock_new_inode(inode);
> +
> + return inode;
> +
> +out:
> + if (ino == MFT_REC_MFT && !sb->s_root)
> + sbi->mft.ni = NULL;
> +
> + iget_failed(inode);
> +
> + return ERR_PTR(err);
> +}
> +
> +/* returns 1 if match */
> +static int ntfs_test_inode(struct inode *inode, const struct MFT_REF *ref)
> +{
> + return ino_get(ref) == inode->i_ino;
> +}
> +
> +static int ntfs_set_inode(struct inode *inode, const struct MFT_REF *ref)
> +{
> + inode->i_ino = ino_get(ref);
> +
> + return 0;
> +}
> +
> +struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
> + const struct cpu_str *name)
> +{
> + struct inode *inode;
> +
> + inode = iget5_locked(sb, ino_get(ref),
> + (int (*)(struct inode *, void *))ntfs_test_inode,
> + (int (*)(struct inode *, void *))ntfs_set_inode,
> + (void *)ref);
> + if (unlikely(!inode))
> + return ERR_PTR(-ENOMEM);
> +
> + /* If this is a freshly allocated inode, need to read it now. */
> + if (inode->i_state & I_NEW)
> + inode = ntfs_read_mft(inode, name, ref);
> + else if (ref->seq != ntfs_i(inode)->mi.mrec->seq)
> + make_bad_inode(inode);
> +
> + return inode;
> +}
> +
> +enum get_block_ctx {
> + GET_BLOCK_GENERAL = 0,
> + GET_BLOCK_WRITE_BEGIN = 1,
> + GET_BLOCK_DIRECT_IO_R = 2,
> + GET_BLOCK_DIRECT_IO_W = 3,
> + GET_BLOCK_BMAP = 4,
> +};
> +
> +static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
> + struct buffer_head *bh, int create,
> + enum get_block_ctx ctx)
> +{
> + struct super_block *sb = inode->i_sb;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + struct ntfs_inode *ni = ntfs_i(inode);
> + u64 bytes, lbo;
> + u32 off;
> + int err;
> + CLST vcn, lcn, len;
> + u8 cluster_bits = sbi->cluster_bits;
> + bool new;
> +
> + /*clear previous state*/
> + clear_buffer_new(bh);
> + clear_buffer_uptodate(bh);
> +
> + /* direct write uses 'create=0'*/
> + if (!create && vbo >= ni->i_valid)
> + return 0;
> +
> + if (vbo >= inode->i_size)
> + return 0;
> +
> + vcn = vbo >> cluster_bits;
> + off = vbo & sbi->cluster_mask;
> + new = false;
> +
> + err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL);
> + if (err)
> + goto out;
> +
> + if (!len)
> + return 0;
> +
> + bytes = ((u64)len << cluster_bits) - off;
> +
> + if (lcn == SPARSE_LCN) {
> + if (!create) {
> + if (bh->b_size > bytes)
> + bh->b_size = bytes;
> +
> + return 0;
> + }
> + WARN_ON(1);
> + }
> +
> + WARN_ON(lcn == RESIDENT_LCN);
> +
> + if (new) {
> + u32 allocated = len * sbi->cluster_size;
> +
> + set_buffer_new(bh);
> + if (allocated > sb->s_blocksize)
> + ntfs_sparse_cluster(inode, bh->b_page,
> + (loff_t)vcn << sbi->cluster_bits,
> + allocated);
> + }
> +
> + lbo = ((u64)lcn << cluster_bits) + off;
> +
> + set_buffer_mapped(bh);
> + bh->b_bdev = sb->s_bdev;
> + bh->b_blocknr = lbo >> sb->s_blocksize_bits;
> +
> + if (ctx == GET_BLOCK_DIRECT_IO_W) {
> + /*ntfs_direct_IO will update ni->i_valid */
> + if (vbo >= ni->i_valid)
> + set_buffer_new(bh);
> + } else if (create && ctx == GET_BLOCK_WRITE_BEGIN &&
> + vbo + bh->b_size > ni->i_valid) {
> + u32 voff = ni->i_valid > vbo ? (ni->i_valid - vbo) : 0;
> + struct page *page = bh->b_page;
> +
> + off = bh_offset(bh);
> + zero_user_segment(page, off + voff, off + bh->b_size);
> + set_buffer_uptodate(bh);
> + ni->i_valid = vbo + bh->b_size;
> +
> + /* ntfs_write_end will update ni->i_valid*/
> + } else if (create) {
> + /*normal write*/
> + if (vbo >= ni->i_valid) {
> + set_buffer_new(bh);
> + if (bytes > bh->b_size)
> + bytes = bh->b_size;
> + ni->i_valid = vbo + bytes;
> + mark_inode_dirty(inode);
> + }
> + } else if (vbo >= ni->i_valid) {
> + /* read out of valid data*/
> + /* should never be here 'cause already checked */
> + clear_buffer_mapped(bh);
> + } else if (vbo + bytes <= ni->i_valid) {
> + /* normal read */
> + } else {
> + /* here: vbo <= ni->i_valid && ni->i_valid < vbo + bytes */
> + u64 valid_up =
> + (ni->i_valid + PAGE_SIZE - 1) & ~(u64)(PAGE_SIZE - 1);
> +
> + bytes = valid_up - vbo;
> + if (bytes < sb->s_blocksize)
> + bytes = sb->s_blocksize;
> + }
> +
> + if (bh->b_size > bytes)
> + bh->b_size = bytes;
> +
> +#ifndef __LP64__
> + if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) {
> + static_assert(sizeof(size_t) < sizeof(loff_t));
> + if (bytes > 0x40000000u)
> + bh->b_size = 0x40000000u;
> + }
> +#endif
> +
> + return 0;
> +
> +out:
> + return err;
> +}
> +
> +/*ntfs_readpage*/
> +/*ntfs_readpages*/
> +/*ntfs_writepage*/
> +/*ntfs_writepages*/
> +/*ntfs_block_truncate_page*/
> +int ntfs_get_block(struct inode *inode, sector_t vbn,
> + struct buffer_head *bh_result, int create)
> +{
> + return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
> + bh_result, create, GET_BLOCK_GENERAL);
> +}
> +
> +/*ntfs_bmap*/
> +static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn,
> + struct buffer_head *bh_result, int create)
> +{
> + return ntfs_get_block_vbo(inode,
> + (u64)vsn << inode->i_sb->s_blocksize_bits,
> + bh_result, create, GET_BLOCK_BMAP);
> +}
> +
> +static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
> +{
> + return generic_block_bmap(mapping, block, ntfs_get_block_bmap);
> +}
> +
> +int ntfs_readpage(struct file *file, struct page *page)
> +{
> + int err;
> + struct address_space *mapping = page->mapping;
> + struct inode *inode = mapping->host;
> + struct ntfs_inode *ni = ntfs_i(inode);
> + u64 vbo = (u64)page->index << PAGE_SHIFT;
> + u64 valid;
> + struct ATTRIB *attr;
> + const char *data;
> + u32 data_size;
> +
> + if (ni_has_resident_data(ni)) {
> + ni_lock(ni);
> +
> + if (!ni_has_resident_data(ni)) {
> + ni_unlock(ni);
> + } else {
> + attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0,
> + NULL, NULL);
> + if (!attr) {
> + err = -EINVAL;
> + ni_unlock(ni);
> + unlock_page(page);
> + goto out;
> + }
> +
> + WARN_ON(attr->non_res);
> +
> + vbo = page->index << PAGE_SHIFT;
> + data = resident_data(attr);
> + data_size = le32_to_cpu(attr->res.data_size);
> +
> + if (vbo < data_size) {
> + void *kaddr = kmap_atomic(page);
> +
> + err = data_size - vbo;
> + if (err > PAGE_SIZE)
> + err = PAGE_SIZE;
> +
> + memcpy(kaddr, data + vbo, err);
> + flush_dcache_page(page);
> + kunmap_atomic(kaddr);
> + zero_user_segment(page, err, PAGE_SIZE);
> + SetPageUptodate(page);
> + } else if (!PageUptodate(page)) {
> + zero_user_segment(page, 0, PAGE_SIZE);
> + SetPageUptodate(page);
> + }
> +
> + ni_unlock(ni);
> + unlock_page(page);
> + return 0;
> + }
> + }
> +
> + if (is_compressed(ni)) {
> + ni_lock(ni);
> + err = ni_readpage_cmpr(ni, page);
> + ni_unlock(ni);
> + return err;
> + }
> +
> + /* normal + sparse files */
> + err = mpage_readpage(page, ntfs_get_block);
> + if (err)
> + goto out;
> +
> + valid = ni->i_valid;
> + if (vbo < valid && valid < vbo + PAGE_SIZE) {
> + if (PageLocked(page))
> + wait_on_page_bit(page, PG_locked);
> + if (PageError(page)) {
> + ntfs_inode_warn(inode, "file garbage at 0x%llx", valid);
> + goto out;
> + }
> + zero_user_segment(page, valid & (PAGE_SIZE - 1), PAGE_SIZE);
> + }
> +
> +out:
> + return err;
> +}
> +
> +static void ntfs_readahead(struct readahead_control *rac)
> +{
> + struct address_space *mapping = rac->mapping;
> + struct inode *inode = mapping->host;
> + struct ntfs_inode *ni = ntfs_i(inode);
> + u64 valid;
> + loff_t pos;
> +
> + if (ni_has_resident_data(ni))
> + return;
> +
> + WARN_ON(is_compressed(ni));
> +
> + valid = ni->i_valid;
> + pos = readahead_pos(rac);
> +
> + if (pos <= valid && valid < pos + readahead_length(rac))
> + return;
> +
> + mpage_readahead(rac, ntfs_get_block);
> +}
> +
> +/*ntfs_direct_IO*/
> +static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock,
> + struct buffer_head *bh_result, int create)
> +{
> + return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
> + bh_result, create, GET_BLOCK_DIRECT_IO_R);
> +}
> +
> +static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock,
> + struct buffer_head *bh_result, int create)
> +{
> + return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits,
> + bh_result, create, GET_BLOCK_DIRECT_IO_W);
> +}
> +
> +static void ntfs_write_failed(struct address_space *mapping, loff_t to)
> +{
> + struct inode *inode = mapping->host;
> +
> + if (to > inode->i_size) {
> + truncate_pagecache(inode, inode->i_size);
> + ntfs_truncate_blocks(inode, inode->i_size);
> + }
> +}
> +
> +static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
> +{
> + struct file *file = iocb->ki_filp;
> + struct address_space *mapping = file->f_mapping;
> + struct inode *inode = mapping->host;
> + struct ntfs_inode *ni = ntfs_i(inode);
> + size_t count = iov_iter_count(iter);
> + loff_t vbo = iocb->ki_pos;
> + loff_t end = vbo + count;
> + int wr = iov_iter_rw(iter) & WRITE;
> + const struct iovec *iov = iter->iov;
> + unsigned long nr_segs = iter->nr_segs;
> + loff_t valid;
> + ssize_t ret;
> +
> + ret = blockdev_direct_IO(iocb, inode, iter,
> + wr ? ntfs_get_block_direct_IO_W :
> + ntfs_get_block_direct_IO_R);
> + valid = ni->i_valid;
> + if (wr) {
> + if (ret < 0)
> + ntfs_write_failed(mapping, end);
> + if (ret <= 0)
> + goto out;
> +
> + vbo += ret;
> + if (vbo > valid && !S_ISBLK(inode->i_mode)) {
> + ni->i_valid = vbo;
> + mark_inode_dirty(inode);
> + }
> + } else if (vbo < valid && valid < end) {
> + /* fix page */
> + unsigned long uaddr = ~0ul;
> + struct page *page;
> + long i, npages;
> + size_t dvbo = valid - vbo;
> + size_t off = 0;
> +
> + /*Find user address*/
> + for (i = 0; i < nr_segs; i++) {
> + if (off <= dvbo && dvbo < off + iov[i].iov_len) {
> + uaddr = (unsigned long)iov[i].iov_base + dvbo -
> + off;
> + break;
> + }
> + off += iov[i].iov_len;
> + }
> +
> + if (uaddr == ~0ul)
> + goto fix_error;
> +
> + npages = get_user_pages_unlocked(uaddr, 1, &page, FOLL_WRITE);
> +
> + if (npages <= 0)
> + goto fix_error;
> +
> + zero_user_segment(page, valid & (PAGE_SIZE - 1), PAGE_SIZE);
> + put_page(page);
> + }
> +
> +out:
> + return ret;
> +fix_error:
> + ntfs_inode_warn(inode, "file garbage at 0x%llx", valid);
> + goto out;
> +}
> +
> +int ntfs_set_size(struct inode *inode, u64 new_size)
> +{
> + struct super_block *sb = inode->i_sb;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + struct ntfs_inode *ni = ntfs_i(inode);
> + int err;
> +
> + /* Check for maximum file size */
> + if (is_sparsed(ni) || is_compressed(ni)) {
> + if (new_size > sbi->maxbytes_sparse) {
> + err = -EFBIG;
> + goto out;
> + }
> + } else if (new_size > sbi->maxbytes) {
> + err = -EFBIG;
> + goto out;
> + }
> +
> + ni_lock(ni);
> + down_write(&ni->file.run_lock);
> +
> + err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
> + &ni->i_valid, true, NULL);
> +
> + up_write(&ni->file.run_lock);
> + ni_unlock(ni);
> +
> + mark_inode_dirty(inode);
> +
> +out:
> + return err;
> +}
> +
> +static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
> +{
> + return block_write_full_page(page, ntfs_get_block, wbc);
> +}
> +
> +static int ntfs_writepage_cmpr(struct page *page, struct writeback_control *wbc)
> +{
> + int err;
> + struct address_space *mapping = page->mapping;
> + struct inode *inode = mapping->host;
> + struct ntfs_inode *ni = ntfs_i(inode);
> + int sync = wbc->sync_mode == WB_SYNC_ALL;
> +
> + if (current->flags & PF_MEMALLOC) {
> +redirty:
> + redirty_page_for_writepage(wbc, page);
> + unlock_page(page);
> + return 0;
> + }
> +
> + if (sync)
> + ni_lock(ni);
> + else if (!ni_trylock(ni))
> + goto redirty;
> +
> + err = ni_writepage_cmpr(page, sync);
> + ni_unlock(ni);
> +
> + return err;
> +}
> +
> +static int ntfs_writepages(struct address_space *mapping,
> + struct writeback_control *wbc)
> +{
> + return mpage_writepages(mapping, wbc, ntfs_get_block);
> +}
> +
> +/*ntfs_write_begin*/
> +static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn,
> + struct buffer_head *bh_result, int create)
> +{
> + return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits,
> + bh_result, create, GET_BLOCK_WRITE_BEGIN);
> +}
> +
> +static int ntfs_write_begin(struct file *file, struct address_space *mapping,
> + loff_t pos, u32 len, u32 flags, struct page **pagep,
> + void **fsdata)
> +{
> + int err;
> +
> + *pagep = NULL;
> +
> + err = block_write_begin(mapping, pos, len, flags, pagep,
> + ntfs_get_block_write_begin);
> + if (err < 0)
> + ntfs_write_failed(mapping, pos + len);
> +
> + return err;
> +}
> +
> +/* address_space_operations::write_end */
> +static int ntfs_write_end(struct file *file, struct address_space *mapping,
> + loff_t pos, u32 len, u32 copied, struct page *page,
> + void *fsdata)
> +
> +{
> + struct inode *inode = mapping->host;
> + struct ntfs_inode *ni = ntfs_i(inode);
> + u64 valid = ni->i_valid;
> + int err;
> +
> + err = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
> +
> + if (err < len)
> + ntfs_write_failed(mapping, pos + len);
> + if (err >= 0) {
> + bool dirty = false;
> +
> + if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) {
> + inode->i_ctime = inode->i_mtime = current_time(inode);
> + ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
> + dirty = true;
> + }
> +
> + if (valid != ni->i_valid) {
> + /* ni->i_valid is changed in ntfs_get_block_vbo */
> + dirty = true;
> + }
> +
> + if (dirty)
> + mark_inode_dirty(inode);
> + }
> +
> + return err;
> +}
> +
> +int reset_log_file(struct inode *inode)
> +{
> + int err;
> + loff_t pos = 0;
> + u32 log_size = inode->i_size;
> + struct address_space *mapping = inode->i_mapping;
> +
> + for (;;) {
> + u32 len;
> + void *kaddr;
> + struct page *page;
> +
> + len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE;
> +
> + err = block_write_begin(mapping, pos, len, 0, &page,
> + ntfs_get_block_write_begin);
> + if (err)
> + goto out;
> +
> + kaddr = kmap_atomic(page);
> + memset(kaddr, -1, len);
> + kunmap_atomic(kaddr);
> + flush_dcache_page(page);
> +
> + err = block_write_end(NULL, mapping, pos, len, len, page, NULL);
> + if (err < 0)
> + goto out;
> + pos += len;
> +
> + if (pos >= log_size)
> + break;
> + balance_dirty_pages_ratelimited(mapping);
> + }
> +out:
> + mark_inode_dirty_sync(inode);
> +
> + return err;
> +}
> +
> +int ntfs_write_inode(struct inode *inode, struct writeback_control *wbc)
> +{
> + if (WARN_ON_ONCE(current->flags & PF_MEMALLOC) ||
> + sb_rdonly(inode->i_sb))
> + return 0;
> +
> + return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
> +}
> +
> +int ntfs_sync_inode(struct inode *inode)
> +{
> + return _ni_write_inode(inode, 1);
> +}
> +
> +/*
> + * helper function for ntfs_flush_inodes. This writes both the inode
> + * and the file data blocks, waiting for in flight data blocks before
> + * the start of the call. It does not wait for any io started
> + * during the call
> + */
> +static int writeback_inode(struct inode *inode)
> +{
> + int ret = sync_inode_metadata(inode, 0);
> +
> + if (!ret)
> + ret = filemap_fdatawrite(inode->i_mapping);
> + return ret;
> +}
> +
> +/*
> + * write data and metadata corresponding to i1 and i2. The io is
> + * started but we do not wait for any of it to finish.
> + *
> + * filemap_flush is used for the block device, so if there is a dirty
> + * page for a block already in flight, we will not wait and start the
> + * io over again
> + */
> +int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
> + struct inode *i2)
> +{
> + int ret = 0;
> +
> + if (i1)
> + ret = writeback_inode(i1);
> + if (!ret && i2)
> + ret = writeback_inode(i2);
> + if (!ret)
> + ret = filemap_flush(sb->s_bdev->bd_inode->i_mapping);
> + return ret;
> +}
> +
> +int inode_write_data(struct inode *inode, const void *data, size_t bytes)
> +{
> + pgoff_t idx;
> +
> + /* Write non resident data */
> + for (idx = 0; bytes; idx++) {
> + size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes;
> + struct page *page = ntfs_map_page(inode->i_mapping, idx);
> +
> + if (IS_ERR(page))
> + return PTR_ERR(page);
> +
> + lock_page(page);
> + WARN_ON(!PageUptodate(page));
> + ClearPageUptodate(page);
> +
> + memcpy(page_address(page), data, op);
> +
> + flush_dcache_page(page);
> + SetPageUptodate(page);
> + unlock_page(page);
> +
> + ntfs_unmap_page(page);
> +
> + bytes -= op;
> + data = Add2Ptr(data, PAGE_SIZE);
> + }
> + return 0;
> +}
> +
> +int ntfs_create_inode(struct inode *dir, struct dentry *dentry,
> + const struct cpu_str *uni, struct file *file,
> + umode_t mode, dev_t dev, const char *symname,
> + unsigned int size, int excl, struct ntfs_fnd *fnd,
> + struct inode **new_inode)
> +{
> + int err;
> + struct super_block *sb = dir->i_sb;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + const struct qstr *name = &dentry->d_name;
> + CLST ino = 0;
> + struct ntfs_inode *dir_ni = ntfs_i(dir);
> + struct ntfs_inode *ni = NULL;
> + struct inode *inode = NULL;
> + struct ATTRIB *attr;
> + struct ATTR_STD_INFO5 *std5;
> + struct ATTR_FILE_NAME *fname;
> + struct MFT_REC *rec;
> + u32 asize, dsize, sd_size;
> + enum FILE_ATTRIBUTE fa;
> + __le32 security_id = SECURITY_ID_INVALID;
> + CLST vcn;
> + const void *sd;
> + u16 t16, nsize = 0, aid = 0;
> + struct INDEX_ROOT *root, *dir_root;
> + struct NTFS_DE *e, *new_de = NULL;
> + struct REPARSE_DATA_BUFFER *rp = NULL;
> + typeof(rp->SymbolicLink2ReparseBuffer) *rb;
> + __le16 *rp_name;
> + bool is_dir = S_ISDIR(mode);
> + bool rp_inserted = false;
> + bool is_sp = S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
> + S_ISSOCK(mode);
> +
> + if (is_sp)
> + return -EOPNOTSUPP;
> +
> + dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
> + if (!dir_root)
> + return -EINVAL;
> +
> + fa = (is_dir ? (dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY) :
> + S_ISLNK(mode) ?
> + FILE_ATTRIBUTE_REPARSE_POINT :
> + sbi->options.sparse ?
> + FILE_ATTRIBUTE_SPARSE_FILE :
> + (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) ?
> + FILE_ATTRIBUTE_COMPRESSED :
> + 0) |
> + FILE_ATTRIBUTE_ARCHIVE;
> +
> + if (!(mode & 0222)) {
> + mode &= ~0222;
> + fa |= FILE_ATTRIBUTE_READONLY;
> + }
> +
> + new_de = __getname();
> + if (!new_de) {
> + err = -ENOMEM;
> + goto out1;
> + }
> +
> + /*mark rw ntfs as dirty. it will be cleared at umount*/
> + ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
> +
> + /* Step 1: allocate and fill new mft record */
> + err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL);
> + if (err)
> + goto out2;
> +
> + ni = ntfs_new_inode(sbi, ino, is_dir);
> + if (IS_ERR(ni)) {
> + err = PTR_ERR(ni);
> + ni = NULL;
> + goto out3;
> + }
> + inode = &ni->vfs_inode;
> +
> + inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
> + current_time(inode);
> +
> + rec = ni->mi.mrec;
> + rec->hard_links = cpu_to_le16(1);
> + attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off));
> +
> + /* Get default security id */
> + sd = s_default_security;
> + sd_size = sizeof(s_default_security);
> +
> + if (is_ntfs3(sbi)) {
> + security_id = dir_ni->std_security_id;
> + if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) {
> + security_id = sbi->security.def_security_id;
> +
> + if (security_id == SECURITY_ID_INVALID &&
> + !ntfs_insert_security(sbi, sd, sd_size,
> + &security_id, NULL))
> + sbi->security.def_security_id = security_id;
> + }
> + }
> +
> + /* Insert standard info */
> + std5 = Add2Ptr(attr, SIZEOF_RESIDENT);
> +
> + if (security_id == SECURITY_ID_INVALID) {
> + dsize = sizeof(struct ATTR_STD_INFO);
> + } else {
> + dsize = sizeof(struct ATTR_STD_INFO5);
> + std5->security_id = security_id;
> + ni->std_security_id = security_id;
> + }
> + asize = SIZEOF_RESIDENT + dsize;
> +
> + attr->type = ATTR_STD;
> + attr->size = cpu_to_le32(asize);
> + attr->id = cpu_to_le16(aid++);
> + attr->res.data_off = SIZEOF_RESIDENT_LE;
> + attr->res.data_size = cpu_to_le32(dsize);
> +
> + std5->cr_time = std5->m_time = std5->c_time = std5->a_time =
> + kernel2nt(&inode->i_atime);
> +
> + ni->std_fa = fa;
> + std5->fa = fa;
> +
> + attr = Add2Ptr(attr, asize);
> +
> + /* Insert file name */
> + err = fill_name_de(sbi, new_de, name, uni);
> + if (err)
> + goto out4;
> +
> + fname = (struct ATTR_FILE_NAME *)(new_de + 1);
> +
> + new_de->ref.low = cpu_to_le32(ino);
> +#ifdef NTFS3_64BIT_CLUSTER
> + new_de->ref.high = cpu_to_le16(ino >> 32);
> + fname->home.high = cpu_to_le16(dir->i_ino >> 32);
> +#endif
> + new_de->ref.seq = rec->seq;
> +
> + fname->home.low = cpu_to_le32(dir->i_ino & 0xffffffff);
> + fname->home.seq = dir_ni->mi.mrec->seq;
> +
> + fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
> + fname->dup.a_time = std5->cr_time;
> + fname->dup.alloc_size = fname->dup.data_size = 0;
> + fname->dup.fa = std5->fa;
> + fname->dup.ea_size = fname->dup.reparse = 0;
> +
> + dsize = le16_to_cpu(new_de->key_size);
> + asize = QuadAlign(SIZEOF_RESIDENT + dsize);
> +
> + attr->type = ATTR_NAME;
> + attr->size = cpu_to_le32(asize);
> + attr->res.data_off = SIZEOF_RESIDENT_LE;
> + attr->res.flags = RESIDENT_FLAG_INDEXED;
> + attr->id = cpu_to_le16(aid++);
> + attr->res.data_size = cpu_to_le32(dsize);
> + memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize);
> +
> + attr = Add2Ptr(attr, asize);
> +
> + if (security_id == SECURITY_ID_INVALID) {
> + /* Insert security attribute */
> + asize = SIZEOF_RESIDENT + QuadAlign(sd_size);
> +
> + attr->type = ATTR_SECURE;
> + attr->size = cpu_to_le32(asize);
> + attr->id = cpu_to_le16(aid++);
> + attr->res.data_off = SIZEOF_RESIDENT_LE;
> + attr->res.data_size = cpu_to_le32(sd_size);
> + memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size);
> +
> + attr = Add2Ptr(attr, asize);
> + }
> +
> + if (is_dir) {
> + /* Create root of directory */
> + dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE);
> + asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize;
> +
> + attr->type = ATTR_ROOT;
> + attr->size = cpu_to_le32(asize);
> + attr->id = cpu_to_le16(aid++);
> +
> + attr->name_len = ARRAY_SIZE(I30_NAME);
> + attr->name_off = SIZEOF_RESIDENT_LE;
> + attr->res.data_off =
> + cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT);
> + attr->res.data_size = cpu_to_le32(dsize);
> + memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME,
> + sizeof(I30_NAME));
> +
> + root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT);
> + memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr));
> + root->ihdr.de_off =
> + cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10
> + root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) +
> + sizeof(struct NTFS_DE));
> + root->ihdr.total = root->ihdr.used;
> +
> + e = Add2Ptr(root, sizeof(struct INDEX_ROOT));
> + e->size = cpu_to_le16(sizeof(struct NTFS_DE));
> + e->flags = NTFS_IE_LAST;
> +
> + ni->ni_flags |= NI_FLAG_DIR;
> +
> + err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30);
> + if (err)
> + goto out4;
> + } else if (S_ISLNK(mode)) {
> + /* Create symlink */
> + dsize = 0;
> + asize = SIZEOF_RESIDENT;
> +
> + /* insert empty ATTR_DATA */
> + attr->type = ATTR_DATA;
> + attr->size = cpu_to_le32(SIZEOF_RESIDENT);
> + attr->id = cpu_to_le16(aid++);
> + attr->name_off = SIZEOF_RESIDENT_LE;
> + attr->res.data_off = SIZEOF_RESIDENT_LE;
> +
> + attr = Add2Ptr(attr, asize);
> +
> + /*
> + * Insert ATTR_REPARSE
> + * Assume each symbol is coded at most with 2 utf16 and zero
> + */
> + rp = ntfs_alloc(ntfs_reparse_bytes(2 * size + 2), 1);
> + if (!rp) {
> + err = -ENOMEM;
> + goto out4;
> + }
> + rb = &rp->SymbolicLink2ReparseBuffer;
> + rp_name = rb->PathBuffer;
> +
> + /* Convert link name to utf16 */
> + err = ntfs_nls_to_utf16(sbi, symname, size,
> + (struct cpu_str *)(rp_name - 1),
> + 2 * size, UTF16_LITTLE_ENDIAN);
> + if (err < 0)
> + goto out4;
> +
> + /* err = the length of unicode name of symlink */
> + nsize = ntfs_reparse_bytes(err);
> +
> + if (nsize > sbi->reparse.max_size) {
> + err = -EFBIG;
> + goto out4;
> + }
> +
> + rp->ReparseTag = IO_REPARSE_TAG_SYMLINK;
> + rp->ReparseDataLength = cpu_to_le16(
> + (nsize - offsetof(struct REPARSE_DATA_BUFFER,
> + SymbolicLink2ReparseBuffer)));
> + rb = &rp->SymbolicLink2ReparseBuffer;
> + rb->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err);
> + rb->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8);
> + rb->PrintNameLength = rb->SubstituteNameOffset;
> + rb->Flags = 0;
> +
> + memmove(rp_name + err + 4, rp_name, sizeof(short) * err);
> +
> + rp_name += err;
> + rp_name[0] = cpu_to_le16('\\');
> + rp_name[1] = cpu_to_le16('?');
> + rp_name[2] = cpu_to_le16('?');
> + rp_name[3] = cpu_to_le16('\\');
> +
> + attr->type = ATTR_REPARSE;
> + attr->id = cpu_to_le16(aid++);
> +
> + /* resident or non resident? */
> + asize = QuadAlign(SIZEOF_RESIDENT + nsize);
> + t16 = PtrOffset(rec, attr);
> +
> + if (asize + t16 + 8 > sbi->record_size) {
> + CLST alen;
> + CLST clst = bytes_to_cluster(sbi, nsize);
> +
> + /* bytes per runs */
> + t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT;
> +
> + attr->non_res = 1;
> + attr->nres.evcn = cpu_to_le64(clst - 1);
> + attr->name_off = SIZEOF_NONRESIDENT_LE;
> + attr->nres.run_off = attr->name_off;
> + attr->nres.data_size = cpu_to_le64(nsize);
> + attr->nres.valid_size = attr->nres.data_size;
> + attr->nres.alloc_size =
> + cpu_to_le64(ntfs_up_cluster(sbi, nsize));
> +
> + err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0,
> + clst, NULL, 0, &alen, 0,
> + NULL);
> + if (err)
> + goto out5;
> +
> + err = run_pack(&ni->file.run, 0, clst,
> + Add2Ptr(attr, SIZEOF_NONRESIDENT), t16,
> + &vcn);
> + if (err < 0)
> + goto out5;
> +
> + if (vcn != clst) {
> + err = -EINVAL;
> + goto out5;
> + }
> +
> + asize = SIZEOF_NONRESIDENT + QuadAlign(err);
> + inode->i_size = nsize;
> + } else {
> + attr->res.data_off = SIZEOF_RESIDENT_LE;
> + attr->res.data_size = cpu_to_le32(nsize);
> + memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);
> + inode->i_size = nsize;
> + nsize = 0;
> + }
> +
> + attr->size = cpu_to_le32(asize);
> +
> + err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK,
> + &new_de->ref);
> + if (err)
> + goto out5;
> +
> + rp_inserted = true;
> + } else {
> + attr->type = ATTR_DATA;
> + attr->id = cpu_to_le16(aid++);
> + /* Create non resident data attribute */
> + attr->non_res = 1;
> + attr->nres.evcn = cpu_to_le64(-1ll);
> + if (fa & FILE_ATTRIBUTE_SPARSE_FILE) {
> + attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
> + attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
> + attr->flags = ATTR_FLAG_SPARSED;
> + asize = SIZEOF_NONRESIDENT_EX + 8;
> + } else if (fa & FILE_ATTRIBUTE_COMPRESSED) {
> + attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8);
> + attr->name_off = SIZEOF_NONRESIDENT_EX_LE;
> + attr->flags = ATTR_FLAG_COMPRESSED;
> + attr->nres.c_unit = COMPRESSION_UNIT;
> + asize = SIZEOF_NONRESIDENT_EX + 8;
> + } else {
> + attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8);
> + attr->name_off = SIZEOF_NONRESIDENT_LE;
> + asize = SIZEOF_NONRESIDENT + 8;
> + }
> + attr->nres.run_off = attr->name_off;
> + }
> +
> + attr = Add2Ptr(attr, asize);
> + attr->type = ATTR_END;
> +
> + rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8);
> + rec->next_attr_id = cpu_to_le16(aid);
> +
> + /* Step 2: Add new name in index */
> + err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd);
> + if (err)
> + goto out6;
> +
> + /* Update current directory record */
> + mark_inode_dirty(dir);
> +
> + /* Fill vfs inode fields */
> + inode->i_uid = sbi->options.uid ? sbi->options.fs_uid : current_fsuid();
> + inode->i_gid =
> + sbi->options.gid ?
> + sbi->options.fs_gid :
> + (dir->i_mode & S_ISGID) ? dir->i_gid : current_fsgid();
> + inode->i_generation = le16_to_cpu(rec->seq);
> +
> + dir->i_mtime = dir->i_ctime = inode->i_atime;
> +
> + if (is_dir) {
> + if (dir->i_mode & S_ISGID)
> + mode |= S_ISGID;
> + inode->i_op = &ntfs_dir_inode_operations;
> + inode->i_fop = &ntfs_dir_operations;
> + } else if (S_ISLNK(mode)) {
> + inode->i_op = &ntfs_link_inode_operations;
> + inode->i_fop = NULL;
> + inode->i_mapping->a_ops = &ntfs_aops;
> + } else {
> + inode->i_op = &ntfs_file_inode_operations;
> + inode->i_fop = &ntfs_file_operations;
> + inode->i_mapping->a_ops =
> + is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops;
> + init_rwsem(&ni->file.run_lock);
> + }
> +
> + inode->i_mode = mode;
> +
> + if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
> + err = ntfs_init_acl(inode, dir);
> + if (err)
> + goto out6;
> + }
> +
> + /* call 'd_instantiate' after inode->i_op is set */
> + d_instantiate(dentry, inode);
> +
> + /* Write non resident data */
> + if (nsize) {
> + err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize);
> + if (err)
> + goto out7;
> + }
> +
> +#ifdef NTFS_COUNT_CONTAINED
> + if (S_ISDIR(mode))
> + inc_nlink(dir);
> +#endif
> + if (file) {
> + if (is_dir)
> + err = finish_no_open(file, NULL);
> + else
> + err = finish_open(file, dentry, ntfs_file_open);
> +
> + if (err)
> + goto out7;
> + file->f_mode |= FMODE_CREATED;
> + }
> +
> + /* normal exit */
> + mark_inode_dirty(inode);
> + mark_inode_dirty(dir);
> + goto out2;
> +
> +out7:
> +
> + /* undo 'indx_insert_entry' */
> + indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
> + le16_to_cpu(new_de->key_size), sbi);
> +out6:
> + if (rp_inserted)
> + ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref);
> +
> +out5:
> + if (is_dir || run_is_empty(&ni->file.run))
> + goto out4;
> +
> + run_deallocate(sbi, &ni->file.run, false);
> +
> +out4:
> + clear_rec_inuse(rec);
> + clear_nlink(inode);
> + ni->mi.dirty = false;
> + discard_new_inode(inode);
> +out3:
> + ntfs_mark_rec_free(sbi, ino);
> +
> +out2:
> + __putname(new_de);
> + ntfs_free(rp);
> +
> +out1:
> + if (err)
> + return err;
> +
> + unlock_new_inode(inode);
> +
> + *new_inode = inode;
> + return 0;
> +}
> +
> +int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
> +{
> + int err;
> + struct inode *dir = d_inode(dentry->d_parent);
> + struct ntfs_inode *dir_ni = ntfs_i(dir);
> + struct ntfs_inode *ni = ntfs_i(inode);
> + struct super_block *sb = inode->i_sb;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + const struct qstr *name = &dentry->d_name;
> + struct NTFS_DE *new_de = NULL;
> + struct ATTR_FILE_NAME *fname;
> + struct ATTRIB *attr;
> + u16 key_size;
> + struct INDEX_ROOT *dir_root;
> +
> + dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
> + if (!dir_root)
> + return -EINVAL;
> +
> + new_de = __getname();
> + if (!new_de)
> + return -ENOMEM;
> +
> + /*mark rw ntfs as dirty. it will be cleared at umount*/
> + ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
> +
> + // Insert file name
> + err = fill_name_de(sbi, new_de, name, NULL);
> + if (err)
> + goto out;
> +
> + key_size = le16_to_cpu(new_de->key_size);
> + fname = (struct ATTR_FILE_NAME *)(new_de + 1);
> +
> + err = ni_insert_resident(ni, key_size, ATTR_NAME, NULL, 0, &attr, NULL);
> + if (err)
> + goto out;
> +
> + new_de->ref.low = cpu_to_le32(inode->i_ino);
> +#ifdef NTFS3_64BIT_CLUSTER
> + new_de->ref.high = cpu_to_le16(inode->i_ino >> 32);
> + fname->home.high = cpu_to_le16(dir->i_ino >> 32);
> +#endif
> + new_de->ref.seq = ni->mi.mrec->seq;
> +
> + fname->home.low = cpu_to_le32(dir->i_ino & 0xffffffff);
> + fname->home.seq = dir_ni->mi.mrec->seq;
> +
> + fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time =
> + fname->dup.a_time = kernel2nt(&inode->i_ctime);
> + fname->dup.alloc_size = fname->dup.data_size = 0;
> + fname->dup.fa = ni->std_fa;
> + fname->dup.ea_size = fname->dup.reparse = 0;
> +
> + memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, key_size);
> +
> + err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, NULL);
> + if (err)
> + goto out;
> +
> + le16_add_cpu(&ni->mi.mrec->hard_links, 1);
> + ni->mi.dirty = true;
> +
> +out:
> + __putname(new_de);
> + return err;
> +}
> +
> +/*
> + * ntfs_unlink_inode
> + *
> + * inode_operations::unlink
> + * inode_operations::rmdir
> + */
> +int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry)
> +{
> + int err;
> + struct super_block *sb = dir->i_sb;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + struct inode *inode = d_inode(dentry);
> + struct ntfs_inode *ni = ntfs_i(inode);
> + const struct qstr *name = &dentry->d_name;
> + struct ntfs_inode *dir_ni = ntfs_i(dir);
> + struct ntfs_index *indx = &dir_ni->dir;
> + struct cpu_str *uni = NULL;
> + struct ATTR_FILE_NAME *fname;
> + u8 name_type;
> + struct ATTR_LIST_ENTRY *le;
> + struct MFT_REF ref;
> + bool is_dir = S_ISDIR(inode->i_mode);
> + struct INDEX_ROOT *dir_root;
> +
> + dir_root = indx_get_root(indx, dir_ni, NULL, NULL);
> + if (!dir_root)
> + return -EINVAL;
> +
> + ni_lock(ni);
> +
> + if (is_dir && !dir_is_empty(inode)) {
> + err = -ENOTEMPTY;
> + goto out1;
> + }
> +
> + if (ntfs_is_meta_file(sbi, inode->i_ino)) {
> + err = -EINVAL;
> + goto out1;
> + }
> +
> + uni = __getname();
> + if (!uni) {
> + err = -ENOMEM;
> + goto out1;
> + }
> +
> + /* Convert input string to unicode */
> + err = ntfs_nls_to_utf16(sbi, name->name, name->len, uni, NTFS_NAME_LEN,
> + UTF16_HOST_ENDIAN);
> + if (err < 0)
> + goto out4;
> +
> + le = NULL;
> +
> + /*mark rw ntfs as dirty. it will be cleared at umount*/
> + ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
> +
> + /* find name in record */
> +#ifdef NTFS3_64BIT_CLUSTER
> + ref.low = cpu_to_le32(dir->i_ino & 0xffffffff);
> + ref.high = cpu_to_le16(dir->i_ino >> 32);
> +#else
> + ref.low = cpu_to_le32(dir->i_ino & 0xffffffff);
> + ref.high = 0;
> +#endif
> + ref.seq = dir_ni->mi.mrec->seq;
> +
> + fname = ni_fname_name(ni, uni, &ref, &le);
> + if (!fname) {
> + err = -ENOENT;
> + goto out3;
> + }
> +
> + name_type = paired_name(fname->type);
> +
> + err = indx_delete_entry(indx, dir_ni, fname, fname_full_size(fname),
> + sbi);
> + if (err)
> + goto out4;
> +
> + /* Then remove name from mft */
> + ni_remove_attr_le(ni, attr_from_name(fname), le);
> +
> + le16_add_cpu(&ni->mi.mrec->hard_links, -1);
> + ni->mi.dirty = true;
> +
> + if (name_type != FILE_NAME_POSIX) {
> + /* Now we should delete name by type */
> + fname = ni_fname_type(ni, name_type, &le);
> + if (fname) {
> + err = indx_delete_entry(indx, dir_ni, fname,
> + fname_full_size(fname), sbi);
> + if (err)
> + goto out4;
> +
> + ni_remove_attr_le(ni, attr_from_name(fname), le);
> +
> + le16_add_cpu(&ni->mi.mrec->hard_links, -1);
> + }
> + }
> +
> +out4:
> + switch (err) {
> + case 0:
> + drop_nlink(inode);
> + case -ENOTEMPTY:
> + case -ENOSPC:
> + case -EROFS:
> + break;
> + default:
> + make_bad_inode(inode);
> + }
> +
> + dir->i_mtime = dir->i_ctime = current_time(dir);
> + mark_inode_dirty(dir);
> + inode->i_ctime = dir->i_ctime;
> + if (inode->i_nlink)
> + mark_inode_dirty(inode);
> +
> +#ifdef NTFS_COUNT_CONTAINED
> + if (is_dir) {
> + clear_nlink(inode);
> + drop_nlink(dir);
> + mark_inode_dirty(dir);
> + }
> +#endif
> +
> +out3:
> + __putname(uni);
> +out1:
> + ni_unlock(ni);
> + return err;
> +}
> +
> +void ntfs_evict_inode(struct inode *inode)
> +{
> + truncate_inode_pages_final(&inode->i_data);
> +
> + if (inode->i_nlink)
> + _ni_write_inode(inode, inode_needs_sync(inode));
> +
> + invalidate_inode_buffers(inode);
> + clear_inode(inode);
> +
> + ni_clear(ntfs_i(inode));
> +}
> +
> +static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer,
> + int buflen)
> +{
> + int err = 0;
> + struct ntfs_inode *ni = ntfs_i(inode);
> + struct super_block *sb = inode->i_sb;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + u64 i_size = inode->i_size;
> + u16 nlen = 0;
> + void *to_free = NULL;
> + struct REPARSE_DATA_BUFFER *rp;
> + struct le_str *uni;
> + struct ATTRIB *attr;
> +
> + /* Reparse data present. Try to parse it */
> + static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag));
> + static_assert(sizeof(u32) == sizeof(rp->ReparseTag));
> +
> + *buffer = 0;
> +
> + /* Read into temporal buffer */
> + if (i_size > sbi->reparse.max_size || i_size <= sizeof(u32)) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL);
> + if (!attr) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + if (!attr->non_res) {
> + rp = resident_data_ex(attr, i_size);
> + if (!rp) {
> + err = -EINVAL;
> + goto out;
> + }
> + } else {
> + rp = ntfs_alloc(i_size, 0);
> + if (!rp) {
> + err = -ENOMEM;
> + goto out;
> + }
> + to_free = rp;
> + err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, i_size, NULL);
> + if (err)
> + goto out;
> + }
> +
> + err = -EINVAL;
> +
> + /* Microsoft Tag */
> + switch (rp->ReparseTag) {
> + case IO_REPARSE_TAG_MICROSOFT | IO_REPARSE_TAG_SYMBOLIC_LINK:
> + /* Symbolic link */
> + /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */
> + if (i_size <= offsetof(struct REPARSE_DATA_BUFFER,
> + SymbolicLinkReparseBuffer.PathBuffer))
> + goto out;
> + uni = Add2Ptr(rp,
> + offsetof(struct REPARSE_DATA_BUFFER,
> + SymbolicLinkReparseBuffer.PathBuffer) +
> + le16_to_cpu(rp->SymbolicLinkReparseBuffer
> + .PrintNameOffset) -
> + 2);
> + nlen = le16_to_cpu(
> + rp->SymbolicLinkReparseBuffer.PrintNameLength);
> + break;
> +
> + case IO_REPARSE_TAG_MOUNT_POINT:
> + /* Mount points and junctions */
> + /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */
> + if (i_size <= offsetof(struct REPARSE_DATA_BUFFER,
> + MountPointReparseBuffer.PathBuffer))
> + goto out;
> + uni = Add2Ptr(rp,
> + offsetof(struct REPARSE_DATA_BUFFER,
> + MountPointReparseBuffer.PathBuffer) +
> + le16_to_cpu(rp->MountPointReparseBuffer
> + .PrintNameOffset) -
> + 2);
> + nlen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength);
> + break;
> +
> + case IO_REPARSE_TAG_SYMLINK:
> + /* FolderSymbolicLink */
> + /* Can we use 'Rp->SymbolicLink2ReparseBuffer.PrintNameLength'? */
> + if (i_size <= offsetof(struct REPARSE_DATA_BUFFER,
> + SymbolicLink2ReparseBuffer.PathBuffer))
> + goto out;
> + uni = Add2Ptr(rp,
> + offsetof(struct REPARSE_DATA_BUFFER,
> + SymbolicLink2ReparseBuffer.PathBuffer) +
> + le16_to_cpu(rp->SymbolicLink2ReparseBuffer
> + .PrintNameOffset) -
> + 2);
> + nlen = le16_to_cpu(
> + rp->SymbolicLink2ReparseBuffer.PrintNameLength);
> + break;
> +
> + case IO_REPARSE_TAG_CLOUD:
> + case IO_REPARSE_TAG_CLOUD_1:
> + case IO_REPARSE_TAG_CLOUD_2:
> + case IO_REPARSE_TAG_CLOUD_3:
> + case IO_REPARSE_TAG_CLOUD_4:
> + case IO_REPARSE_TAG_CLOUD_5:
> + case IO_REPARSE_TAG_CLOUD_6:
> + case IO_REPARSE_TAG_CLOUD_7:
> + case IO_REPARSE_TAG_CLOUD_8:
> + case IO_REPARSE_TAG_CLOUD_9:
> + case IO_REPARSE_TAG_CLOUD_A:
> + case IO_REPARSE_TAG_CLOUD_B:
> + case IO_REPARSE_TAG_CLOUD_C:
> + case IO_REPARSE_TAG_CLOUD_D:
> + case IO_REPARSE_TAG_CLOUD_E:
> + case IO_REPARSE_TAG_CLOUD_F:
> + err = sizeof("OneDrive") - 1;
> + if (err > buflen)
> + err = buflen;
> + memcpy(buffer, "OneDrive", err);
> + goto out;
> +
> + default:
> + if (IsReparseTagMicrosoft(rp->ReparseTag))
> + goto out;
> + if (!IsReparseTagNameSurrogate(rp->ReparseTag) ||
> + i_size <= sizeof(struct REPARSE_POINT)) {
> + goto out;
> + }
> +
> + /* Users tag */
> + uni = Add2Ptr(rp, sizeof(struct REPARSE_POINT) - 2);
> + nlen = le16_to_cpu(
> + ((struct REPARSE_POINT *)rp)->ReparseDataLength) -
> + sizeof(struct REPARSE_POINT);
> + }
> +
> + /* Convert nlen from bytes to UNICODE chars */
> + nlen >>= 1;
> +
> + /* Check that name is available */
> + if (!nlen || &uni->name[nlen] > (__le16 *)Add2Ptr(rp, i_size))
> + goto out;
> +
> + /* If name is already zero terminated then truncate it now */
> + if (!uni->name[nlen - 1])
> + nlen -= 1;
> + uni->len = nlen;
> +
> + err = ntfs_utf16_to_nls(sbi, uni, buffer, buflen);
> +
> + if (err < 0)
> + goto out;
> +
> + /* Always set last zero */
> + buffer[err] = 0;
> +
> +out:
> + ntfs_free(to_free);
> +
> + return err;
> +}
> +
> +static const char *ntfs_get_link(struct dentry *de, struct inode *inode,
> + struct delayed_call *done)
> +{
> + int err;
> + char *ret;
> +
> + if (!de)
> + return ERR_PTR(-ECHILD);
> +
> + ret = kmalloc(PAGE_SIZE, GFP_NOFS);
> + if (!ret)
> + return ERR_PTR(-ENOMEM);
> +
> + err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE);
> + if (err < 0) {
> + kfree(ret);
> + return ERR_PTR(err);
> + }
> +
> + set_delayed_call(done, kfree_link, ret);
> +
> + return ret;
> +}
> +
> +const struct inode_operations ntfs_link_inode_operations = {
> + .get_link = ntfs_get_link,
> + .setattr = ntfs_setattr,
> + .listxattr = ntfs_listxattr,
> + .permission = ntfs_permission,
> + .get_acl = ntfs_get_acl,
> + .set_acl = ntfs_set_acl,
> +};
> +
> +const struct address_space_operations ntfs_aops = { .readpage = ntfs_readpage,
> + .readahead = ntfs_readahead,
> + .writepage = ntfs_writepage,
> + .writepages =
> + ntfs_writepages,
> + .write_begin =
> + ntfs_write_begin,
> + .write_end = ntfs_write_end,
> + .direct_IO = ntfs_direct_IO,
> + .bmap = ntfs_bmap };
> +
> +const struct address_space_operations ntfs_aops_cmpr = {
> + .readpage = ntfs_readpage,
> + .writepage = ntfs_writepage_cmpr,
> + .set_page_dirty = __set_page_dirty_nobuffers,
> +};
> diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
> new file mode 100644
> index 000000000000..14915398dd74
> --- /dev/null
> +++ b/fs/ntfs3/super.c
> @@ -0,0 +1,1430 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * linux/fs/ntfs3/super.c
> + *
> + * Copyright (C) 2019-2020 Paragon Software GmbH, All rights reserved.
> + *
> + *
> + * terminology
> + *
> + * vcn - virtual cluster number - offset inside the file in clusters
> + * vbo - virtual byte offset - offset inside the file in bytes
> + * lcn - logical cluster number - 0 based cluster in clusters heap
> + * lbo - logical byte offset - absolute position inside volume
> + *
> + */
> +
> +#include <linux/backing-dev.h>
> +#include <linux/blkdev.h>
> +#include <linux/buffer_head.h>
> +#include <linux/exportfs.h>
> +#include <linux/fs.h>
> +#include <linux/iversion.h>
> +#include <linux/module.h>
> +#include <linux/nls.h>
> +#include <linux/parser.h>
> +#include <linux/seq_file.h>
> +#include <linux/statfs.h>
> +
> +#include "debug.h"
> +#include "ntfs.h"
> +#include "ntfs_fs.h"
> +
> +#ifdef CONFIG_PRINTK
> +/*
> + * Trace warnings/notices/errors
> + * Thanks Joe Perches <joe@...ches.com> for implementation
> + */
> +void ntfs_printk(const struct super_block *sb, const char *fmt, ...)
> +{
> + struct va_format vaf;
> + va_list args;
> + int level;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> +
> + /*should we use different ratelimits for warnings/notices/errors? */
> + if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
> + return;
> +
> + va_start(args, fmt);
> +
> + level = printk_get_level(fmt);
> + vaf.fmt = printk_skip_level(fmt);
> + vaf.va = &args;
> + printk("%c%cntfs3: %s: %pV\n", KERN_SOH_ASCII, level, sb->s_id, &vaf);
> +
> + va_end(args);
> +}
> +
> +/* print warnings/notices/errors about inode using name or inode number */
> +void ntfs_inode_printk(struct inode *inode, const char *fmt, ...)
> +{
> + struct super_block *sb = inode->i_sb;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + struct dentry *dentry;
> + char *name;
> + va_list args;
> + struct va_format vaf;
> + int level;
> + /*not necessary to print full inode name. just for information */
> + const u32 name_len = 63;
> +
> + if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3"))
> + return;
> +
> + name = ntfs_alloc(name_len + 1, 0);
> + if (!name)
> + return;
> +
> + dentry = d_find_alias(inode);
> + if (dentry) {
> + /*we can get the name of inode*/
> + spin_lock(&dentry->d_lock);
> + snprintf(name, name_len, "%s", dentry->d_name.name);
> + spin_unlock(&dentry->d_lock);
> + dput(dentry);
> + name[name_len] = 0; /* to be sure*/
> + } else {
> + /*use inode number as inode info*/
> + snprintf(name, name_len, "ino=%lx", inode->i_ino);
> + }
> +
> + va_start(args, fmt);
> +
> + level = printk_get_level(fmt);
> + vaf.fmt = printk_skip_level(fmt);
> + vaf.va = &args;
> +
> + printk("%c%cntfs3: %s: %s %pV\n", KERN_SOH_ASCII, level, sb->s_id, name,
> + &vaf);
> +
> + va_end(args);
> +
> + ntfs_free(name);
> +}
> +#endif
> +
> +/*
> + * Shared memory struct.
> + *
> + * on-disk ntfs's upcase table is created by ntfs formater
> + * 'upcase' table is 128K bytes of memory
> + * we should read it into memory when mounting
> + * Several ntfs volumes likely use the same 'upcase' table
> + * It is good idea to share in-memory 'upcase' table between different volumes
> + * Unfortunately winxp/vista/win7 use different upcase tables
> + */
> +static DEFINE_SPINLOCK(s_shared_lock);
> +
> +static struct {
> + void *ptr;
> + u32 len;
> + int cnt;
> +} s_shared[8];
> +
> +/*
> + * ntfs_set_shared
> + *
> + * Returns 'ptr' if pointer was saved in shared memory
> + * Returns NULL if pointer was not shared
> + */
> +void *ntfs_set_shared(void *ptr, u32 bytes)
> +{
> + void *ret = NULL;
> + int i, j = -1;
> +
> + spin_lock(&s_shared_lock);
> + for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
> + if (!s_shared[i].cnt) {
> + j = i;
> + } else if (bytes == s_shared[i].len &&
> + !memcmp(s_shared[i].ptr, ptr, bytes)) {
> + s_shared[i].cnt += 1;
> + ret = s_shared[i].ptr;
> + break;
> + }
> + }
> +
> + if (!ret && j != -1) {
> + s_shared[j].ptr = ptr;
> + s_shared[j].len = bytes;
> + s_shared[j].cnt = 1;
> + ret = ptr;
> + }
> + spin_unlock(&s_shared_lock);
> +
> + return ret;
> +}
> +
> +/*
> + * ntfs_put_shared
> + *
> + * Returns 'ptr' if pointer is not shared anymore
> + * Returns NULL if pointer is still shared
> + */
> +void *ntfs_put_shared(void *ptr)
> +{
> + void *ret = ptr;
> + int i;
> +
> + spin_lock(&s_shared_lock);
> + for (i = 0; i < ARRAY_SIZE(s_shared); i++) {
> + if (s_shared[i].cnt && s_shared[i].ptr == ptr) {
> + if (--s_shared[i].cnt)
> + ret = NULL;
> + break;
> + }
> + }
> + spin_unlock(&s_shared_lock);
> +
> + return ret;
> +}
> +
> +static int ntfs_remount(struct super_block *sb, int *flags, char *data)
> +{
> + *flags |= SB_NODIRATIME | SB_NOATIME;
> + sync_filesystem(sb);
> + return 0;
> +}
> +
> +static struct kmem_cache *ntfs_inode_cachep;
> +
> +static struct inode *ntfs_alloc_inode(struct super_block *sb)
> +{
> + struct ntfs_inode *ni = kmem_cache_alloc(ntfs_inode_cachep, GFP_NOFS);
> +
> + if (!ni)
> + return NULL;
> +
> + memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode));
> +
> + mutex_init(&ni->ni_lock);
> +
> + return &ni->vfs_inode;
> +}
> +
> +static void ntfs_i_callback(struct rcu_head *head)
> +{
> + struct inode *inode = container_of(head, struct inode, i_rcu);
> + struct ntfs_inode *ni = ntfs_i(inode);
> +
> + mutex_destroy(&ni->ni_lock);
> +
> + kmem_cache_free(ntfs_inode_cachep, ni);
> +}
> +
> +static void ntfs_destroy_inode(struct inode *inode)
> +{
> + call_rcu(&inode->i_rcu, ntfs_i_callback);
> +}
> +
> +static void init_once(void *foo)
> +{
> + struct ntfs_inode *ni = foo;
> +
> + inode_init_once(&ni->vfs_inode);
> +}
> +
> +/* noinline to reduce binary size*/
> +static noinline void put_ntfs(struct ntfs_sb_info *sbi)
> +{
> + ntfs_free(sbi->new_rec);
> + ntfs_free(ntfs_put_shared(sbi->upcase));
> + ntfs_free(sbi->def_table);
> +
> + wnd_close(&sbi->mft.bitmap);
> + wnd_close(&sbi->used.bitmap);
> +
> + if (sbi->mft.ni)
> + iput(&sbi->mft.ni->vfs_inode);
> +
> + if (sbi->security.ni)
> + iput(&sbi->security.ni->vfs_inode);
> +
> + if (sbi->reparse.ni)
> + iput(&sbi->reparse.ni->vfs_inode);
> +
> + if (sbi->objid.ni)
> + iput(&sbi->objid.ni->vfs_inode);
> +
> + if (sbi->volume.ni)
> + iput(&sbi->volume.ni->vfs_inode);
> +
> + ntfs_update_mftmirr(sbi, 0);
> +
> + indx_clear(&sbi->security.index_sii);
> + indx_clear(&sbi->security.index_sdh);
> + indx_clear(&sbi->reparse.index_r);
> + indx_clear(&sbi->objid.index_o);
> + ntfs_free(sbi->compress.frame_unc);
> + ntfs_free(sbi->compress.ctx);
> +
> + unload_nls(sbi->nls[0]);
> + unload_nls(sbi->nls[1]);
> +
> + ntfs_free(sbi);
> +}
> +
> +static void ntfs_put_super(struct super_block *sb)
> +{
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> +
> + /*mark rw ntfs as clear, if possible*/
> + ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
> +
> + put_ntfs(sbi);
> +
> + sync_blockdev(sb->s_bdev);
> +}
> +
> +static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf)
> +{
> + struct super_block *sb = dentry->d_sb;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + struct wnd_bitmap *wnd = &sbi->used.bitmap;
> +
> + buf->f_type = sb->s_magic;
> + buf->f_bsize = sbi->cluster_size;
> + buf->f_blocks = wnd->nbits;
> +
> + buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd);
> + buf->f_fsid.val[0] = (u32)sbi->volume.ser_num;
> + buf->f_fsid.val[1] = (u32)(sbi->volume.ser_num >> 32);
> + buf->f_namelen = NTFS_NAME_LEN;
> +
> + return 0;
> +}
> +
> +static int ntfs_show_options(struct seq_file *m, struct dentry *root)
> +{
> + struct super_block *sb = root->d_sb;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + struct mount_options *opts = &sbi->options;
> +
> + if (opts->uid)
> + seq_printf(m, ",uid=%u",
> + from_kuid_munged(&init_user_ns, opts->fs_uid));
> + if (opts->gid)
> + seq_printf(m, ",gid=%u",
> + from_kgid_munged(&init_user_ns, opts->fs_gid));
> + if (opts->fmask)
> + seq_printf(m, ",fmask=%04o", ~opts->fs_fmask_inv);
> + if (opts->dmask)
> + seq_printf(m, ",dmask=%04o", ~opts->fs_dmask_inv);
> + if (sbi->nls[0])
> + seq_printf(m, ",nls=%s", sbi->nls[0]->charset);
> + else
> + seq_puts(m, ",nls=utf8");
> + if (sbi->nls[1])
> + seq_printf(m, ",nls_alt=%s", sbi->nls[1]->charset);
> + if (opts->sys_immutable)
> + seq_puts(m, ",sys_immutable");
> + if (opts->discard)
> + seq_puts(m, ",discard");
> + if (opts->sparse)
> + seq_puts(m, ",sparse");
> + if (opts->showmeta)
> + seq_puts(m, ",showmeta");
> + if (opts->nohidden)
> + seq_puts(m, ",nohidden");
> + if (opts->force)
> + seq_puts(m, ",force");
> + if (opts->no_acs_rules)
> + seq_puts(m, ",no_acs_rules");
> + if (opts->prealloc)
> + seq_puts(m, ",prealloc");
> + if (sb->s_flags & SB_POSIXACL)
> + seq_puts(m, ",acl");
> + if (sb->s_flags & SB_NOATIME)
> + seq_puts(m, ",noatime");
> +
> + return 0;
> +}
> +
> +/*super_operations::sync_fs*/
> +static int ntfs_sync_fs(struct super_block *sb, int wait)
> +{
> + int err = 0, err2;
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + struct ntfs_inode *ni;
> + struct inode *inode;
> +
> + ni = sbi->security.ni;
> + if (ni) {
> + inode = &ni->vfs_inode;
> + err2 = _ni_write_inode(inode, wait);
> + if (err2 && !err)
> + err = err2;
> + }
> +
> + ni = sbi->objid.ni;
> + if (ni) {
> + inode = &ni->vfs_inode;
> + err2 = _ni_write_inode(inode, wait);
> + if (err2 && !err)
> + err = err2;
> + }
> +
> + ni = sbi->reparse.ni;
> + if (ni) {
> + inode = &ni->vfs_inode;
> + err2 = _ni_write_inode(inode, wait);
> + if (err2 && !err)
> + err = err2;
> + }
> +
> + if (!err)
> + ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
> +
> + ntfs_update_mftmirr(sbi, wait);
> +
> + return err;
> +}
> +
> +static const struct super_operations ntfs_sops = {
> + .alloc_inode = ntfs_alloc_inode,
> + .destroy_inode = ntfs_destroy_inode,
> + .evict_inode = ntfs_evict_inode,
> + .put_super = ntfs_put_super,
> + .statfs = ntfs_statfs,
> + .show_options = ntfs_show_options,
> + .sync_fs = ntfs_sync_fs,
> + .remount_fs = ntfs_remount,
> + .write_inode = ntfs_write_inode,
> +};
> +
> +static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino,
> + u32 generation)
> +{
> + struct MFT_REF ref;
> + struct inode *inode;
> +
> + ref.low = cpu_to_le32(ino);
> +#ifdef NTFS3_64BIT_CLUSTER
> + ref.high = cpu_to_le16(ino >> 32);
> +#else
> + ref.high = 0;
> +#endif
> + ref.seq = cpu_to_le16(generation);
> +
> + inode = ntfs_iget5(sb, &ref, NULL);
> + if (!IS_ERR(inode) && is_bad_inode(inode)) {
> + iput(inode);
> + inode = ERR_PTR(-ESTALE);
> + }
> +
> + return inode;
> +}
> +
> +static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
> + int fh_len, int fh_type)
> +{
> + return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
> + ntfs_export_get_inode);
> +}
> +
> +static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid,
> + int fh_len, int fh_type)
> +{
> + return generic_fh_to_parent(sb, fid, fh_len, fh_type,
> + ntfs_export_get_inode);
> +}
> +
> +/* TODO: == ntfs_sync_inode */
> +static int ntfs_nfs_commit_metadata(struct inode *inode)
> +{
> + return _ni_write_inode(inode, 1);
> +}
> +
> +static const struct export_operations ntfs_export_ops = {
> + .fh_to_dentry = ntfs_fh_to_dentry,
> + .fh_to_parent = ntfs_fh_to_parent,
> + .get_parent = ntfs_get_parent,
> + .commit_metadata = ntfs_nfs_commit_metadata,
> +};
> +
> +/* Returns Gb,Mb to print with "%u.%02u Gb" */
> +static u32 format_size_gb(const u64 bytes, u32 *mb)
> +{
> + /* Do simple right 30 bit shift of 64 bit value */
> + u64 kbytes = bytes >> 10;
> + u32 kbytes32 = (u32)kbytes;
> +
> + *mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20;
> + if (*mb >= 100)
> + *mb = 99;
> +
> + return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12);
> +}
> +
> +static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot)
> +{
> + return boot->sectors_per_clusters <= 0x80 ?
> + boot->sectors_per_clusters :
> + (1u << (0 - boot->sectors_per_clusters));
> +}
> +
> +/* inits internal info from on-disk boot sector*/
> +static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
> + u64 dev_size)
> +{
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + int err;
> + u32 mb, gb, boot_sector_size, sct_per_clst, record_size;
> + u64 sectors, clusters, fs_size, mlcn, mlcn2;
> + struct NTFS_BOOT *boot;
> + struct buffer_head *bh;
> + struct MFT_REC *rec;
> + u16 fn, ao;
> +
> + sbi->volume.blocks = dev_size >> PAGE_SHIFT;
> +
> + bh = ntfs_bread(sb, 0);
> + if (!bh)
> + return -EIO;
> +
> + err = -EINVAL;
> + boot = (struct NTFS_BOOT *)bh->b_data;
> +
> + if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1))
> + goto out;
> +
> + /* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/
> + /*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1])
> + * goto out;
> + */
> +
> + boot_sector_size = (u32)boot->bytes_per_sector[1] << 8;
> + if (boot->bytes_per_sector[0] || boot_sector_size < SECTOR_SIZE ||
> + !is_power_of2(boot_sector_size)) {
> + goto out;
> + }
> +
> + sct_per_clst = true_sectors_per_clst(boot);
> + if (!is_power_of2(sct_per_clst))
> + goto out;
> +
> + mlcn = le64_to_cpu(boot->mft_clst);
> + mlcn2 = le64_to_cpu(boot->mft2_clst);
> + sectors = le64_to_cpu(boot->sectors_per_volume);
> +
> + if (mlcn * sct_per_clst >= sectors)
> + goto out;
> +
> + if (mlcn2 * sct_per_clst >= sectors)
> + goto out;
> +
> + /* Check MFT record size */
> + if ((boot->record_size < 0 &&
> + SECTOR_SIZE > (2U << (-boot->record_size))) ||
> + (boot->record_size >= 0 && !is_power_of2(boot->record_size))) {
> + goto out;
> + }
> +
> + /* Check index record size */
> + if ((boot->index_size < 0 &&
> + SECTOR_SIZE > (2U << (-boot->index_size))) ||
> + (boot->index_size >= 0 && !is_power_of2(boot->index_size))) {
> + goto out;
> + }
> +
> + sbi->sector_size = boot_sector_size;
> + sbi->sector_bits = blksize_bits(boot_sector_size);
> + fs_size = (sectors + 1) << sbi->sector_bits;
> +
> + gb = format_size_gb(fs_size, &mb);
> +
> + /*
> + * - Volume formatted and mounted with the same sector size
> + * - Volume formatted 4K and mounted as 512
> + * - Volume formatted 512 and mounted as 4K
> + */
> + if (sbi->sector_size != sector_size) {
> + ntfs_warn(sb,
> + "Different NTFS' sector size and media sector size");
> + dev_size += sector_size - 1;
> + }
> +
> + sbi->cluster_size = boot_sector_size * sct_per_clst;
> + sbi->cluster_bits = blksize_bits(sbi->cluster_size);
> +
> + sbi->mft.lbo = mlcn << sbi->cluster_bits;
> + sbi->mft.lbo2 = mlcn2 << sbi->cluster_bits;
> +
> + if (sbi->cluster_size < sbi->sector_size)
> + goto out;
> +
> + sbi->cluster_mask = sbi->cluster_size - 1;
> + sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask;
> + sbi->record_size = record_size = boot->record_size < 0 ?
> + 1 << (-boot->record_size) :
> + (u32)boot->record_size
> + << sbi->cluster_bits;
> +
> + if (record_size > MAXIMUM_BYTES_PER_MFT)
> + goto out;
> +
> + sbi->record_bits = blksize_bits(record_size);
> + sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes
> +
> + sbi->max_bytes_per_attr =
> + record_size - QuadAlign(MFTRECORD_FIXUP_OFFSET_1) -
> + QuadAlign(((record_size >> SECTOR_SHIFT) * sizeof(short))) -
> + QuadAlign(sizeof(enum ATTR_TYPE));
> +
> + sbi->index_size = boot->index_size < 0 ?
> + 1u << (-boot->index_size) :
> + (u32)boot->index_size << sbi->cluster_bits;
> +
> + sbi->volume.ser_num = le64_to_cpu(boot->serial_num);
> + sbi->volume.size = sectors << sbi->sector_bits;
> +
> + /* warning if RAW volume */
> + if (dev_size < fs_size) {
> + u32 mb0, gb0;
> +
> + gb0 = format_size_gb(dev_size, &mb0);
> + ntfs_warn(
> + sb,
> + "RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only",
> + gb, mb, gb0, mb0);
> + sb->s_flags |= SB_RDONLY;
> + }
> +
> + clusters = sbi->volume.size >> sbi->cluster_bits;
> +#ifdef NTFS3_64BIT_CLUSTER
> +#if BITS_PER_LONG < 64
> +#error "NTFS3_64BIT_CLUSTER incompatible in 32 bit OS"
> +#endif
> +#else
> + /* 32 bits per cluster */
> + if (clusters >> 32) {
> + ntfs_notice(
> + sb,
> + "NTFS %u.%02u Gb is too big to use 32 bits per cluster",
> + gb, mb);
> + goto out;
> + }
> +#endif
> +
> + sbi->used.bitmap.nbits = clusters;
> +
> + rec = ntfs_alloc(record_size, 1);
> + if (!rec) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + sbi->new_rec = rec;
> + rec->rhdr.sign = NTFS_FILE_SIGNATURE;
> + rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET_1);
> + fn = (sbi->record_size >> SECTOR_SHIFT) + 1;
> + rec->rhdr.fix_num = cpu_to_le16(fn);
> + ao = QuadAlign(MFTRECORD_FIXUP_OFFSET_1 + sizeof(short) * fn);
> + rec->attr_off = cpu_to_le16(ao);
> + rec->used = cpu_to_le32(ao + QuadAlign(sizeof(enum ATTR_TYPE)));
> + rec->total = cpu_to_le32(sbi->record_size);
> + ((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END;
> +
> + if (sbi->cluster_size < PAGE_SIZE)
> + sb_set_blocksize(sb, sbi->cluster_size);
> +
> + sbi->block_mask = sb->s_blocksize - 1;
> + sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits;
> + sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits;
> +
> + /* Maximum size for normal files */
> + sbi->maxbytes = (clusters << sbi->cluster_bits) - 1;
> +
> +#ifdef NTFS3_64BIT_CLUSTER
> + if (clusters >= (1ull << (64 - sbi->cluster_bits)))
> + sbi->maxbytes = -1;
> + sbi->maxbytes_sparse = -1;
> +#else
> + /* Maximum size for sparse file */
> + sbi->maxbytes_sparse = (1ull << (sbi->cluster_bits + 32)) - 1;
> +#endif
> +
> + err = 0;
> +
> +out:
> + brelse(bh);
> +
> + return err;
> +}
> +
> +enum Opt {
> + Opt_uid,
> + Opt_gid,
> + Opt_umask,
> + Opt_dmask,
> + Opt_fmask,
> + Opt_immutable,
> + Opt_discard,
> + Opt_force,
> + Opt_sparse,
> + Opt_nohidden,
> + Opt_showmeta,
> + Opt_acl,
> + Opt_noatime,
> + Opt_nls,
> + Opt_nls_alt,
> + Opt_prealloc,
> + Opt_no_acs_rules,
> + Opt_err,
> +};
> +
> +static const match_table_t fat_tokens = { { Opt_uid, "uid=%u" },
> + { Opt_gid, "gid=%u" },
> + { Opt_umask, "umask=%o" },
> + { Opt_dmask, "dmask=%o" },
> + { Opt_fmask, "fmask=%o" },
> + { Opt_immutable, "sys_immutable" },
> + { Opt_discard, "discard" },
> + { Opt_force, "force" },
> + { Opt_sparse, "sparse" },
> + { Opt_nohidden, "nohidden" },
> + { Opt_acl, "acl" },
> + { Opt_noatime, "noatime" },
> + { Opt_showmeta, "showmeta" },
> + { Opt_nls, "nls=%s" },
> + { Opt_nls_alt, "nls_alt=%s" },
> + { Opt_prealloc, "prealloc" },
> + { Opt_no_acs_rules, "no_acs_rules" },
> + { Opt_err, NULL } };
> +
> +static noinline int ntfs_parse_options(struct super_block *sb, char *options,
> + int silent, struct mount_options *opts)
> +{
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + char *p;
> + substring_t args[MAX_OPT_ARGS];
> + int i, option;
> + char nls_name[2][30];
> +
> + opts->fs_uid = current_uid();
> + opts->fs_gid = current_gid();
> + opts->fs_fmask_inv = opts->fs_dmask_inv = ~current_umask();
> + nls_name[0][0] = 0;
> + nls_name[1][0] = 0;
> +
> + if (!options)
> + goto out;
> +
> + while ((p = strsep(&options, ","))) {
> + int token;
> +
> + if (!*p)
> + continue;
> +
> + token = match_token(p, fat_tokens, args);
> + switch (token) {
> + case Opt_immutable:
> + opts->sys_immutable = 1;
> + break;
> + case Opt_uid:
> + if (match_int(&args[0], &option))
> + return -EINVAL;
> + opts->fs_uid = make_kuid(current_user_ns(), option);
> + if (!uid_valid(opts->fs_uid))
> + return -EINVAL;
> + opts->uid = 1;
> + break;
> + case Opt_gid:
> + if (match_int(&args[0], &option))
> + return -EINVAL;
> + opts->fs_gid = make_kgid(current_user_ns(), option);
> + if (!gid_valid(opts->fs_gid))
> + return -EINVAL;
> + opts->gid = 1;
> + break;
> + case Opt_umask:
> + if (match_octal(&args[0], &option))
> + return -EINVAL;
> + opts->fs_fmask_inv = opts->fs_dmask_inv = ~option;
> + opts->fmask = opts->dmask = 1;
> + break;
> + case Opt_dmask:
> + if (match_octal(&args[0], &option))
> + return -EINVAL;
> + opts->fs_dmask_inv = ~option;
> + opts->dmask = 1;
> + break;
> + case Opt_fmask:
> + if (match_octal(&args[0], &option))
> + return -EINVAL;
> + opts->fs_fmask_inv = ~option;
> + opts->fmask = 1;
> + break;
> + case Opt_discard:
> + opts->discard = 1;
> + break;
> + case Opt_force:
> + opts->force = 1;
> + break;
> + case Opt_sparse:
> + opts->sparse = 1;
> + break;
> + case Opt_nohidden:
> + opts->nohidden = 1;
> + break;
> + case Opt_acl:
> + sb->s_flags |= SB_POSIXACL;
> + break;
> + case Opt_noatime:
> + sb->s_flags |= SB_NOATIME;
> + break;
> + case Opt_showmeta:
> + opts->showmeta = 1;
> + break;
> + case Opt_nls:
> + case Opt_nls_alt:
> + match_strlcpy(nls_name[token == Opt_nls_alt], &args[0],
> + sizeof(nls_name[0]));
> + break;
> + case Opt_prealloc:
> + opts->prealloc = 1;
> + break;
> + case Opt_no_acs_rules:
> + opts->no_acs_rules = 1;
> + break;
> + default:
> + if (!silent)
> + ntfs_err(
> + sb,
> + "Unrecognized mount option \"%s\" or missing value",
> + p);
> + //return -EINVAL;
> + }
> + }
> +
> +out:
> +
> + for (i = 0; i < ARRAY_SIZE(sbi->nls); i++) {
> + struct nls_table *nls;
> +
> + if (nls_name[i][0]) {
> + nls = load_nls(nls_name[i]);
> + if (!nls) {
> + ntfs_err(sb, "failed to load \"%s\"",
> + nls_name[i]);
> + return -EINVAL;
> + }
> + } else {
> + nls = load_nls_default();
> + if (!nls) {
> + ntfs_err(sb, "failed to load default nls");
> + return -EINVAL;
> + }
> + }
> +
> + sbi->nls[i] = nls;
> + }
> +
> + /* unload alternative nls if it equals primary one */
> + if (!strcmp(sbi->nls[0]->charset, sbi->nls[1]->charset)) {
> + unload_nls(sbi->nls[1]);
> + sbi->nls[1] = NULL;
> + }
> +
> + if (!strcmp(sbi->nls[0]->charset, "utf8")) {
> + /*use utf16s_to_utf8s/utf8s_to_utf16s instead of nls*/
> + unload_nls(sbi->nls[0]);
> + sbi->nls[0] = NULL;
> + }
> +
> + return 0;
> +}
> +
> +/* try to mount*/
> +static int ntfs_fill_super(struct super_block *sb, void *data, int silent)
> +{
> + int err;
> + struct ntfs_sb_info *sbi;
> + struct block_device *bdev = sb->s_bdev;
> + struct inode *bd_inode = bdev->bd_inode;
> + struct request_queue *rq = bdev_get_queue(bdev);
> + struct inode *inode = NULL;
> + struct ntfs_inode *ni;
> + size_t i, tt;
> + CLST vcn, lcn, len;
> + struct ATTRIB *attr;
> + const struct VOLUME_INFO *info;
> + u32 idx, done, bytes;
> + struct ATTR_DEF_ENTRY *t;
> + u16 *upcase = NULL;
> + u16 *shared;
> + bool is_ro;
> + struct MFT_REF ref;
> +
> + ref.high = 0;
> +
> + sbi = ntfs_alloc(sizeof(struct ntfs_sb_info), true);
> + if (!sbi)
> + return -ENOMEM;
> +
> + sb->s_fs_info = sbi;
> + sbi->sb = sb;
> + sb->s_flags |= SB_NODIRATIME;
> + sb->s_magic = 0x337366746e; // "ntfs3"
> + sb->s_op = &ntfs_sops;
> + sb->s_export_op = &ntfs_export_ops;
> + sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec
> + sb->s_xattr = ntfs_xattr_handlers;
> + sb->s_maxbytes = MAX_LFS_FILESIZE;
> +
> + ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL,
> + DEFAULT_RATELIMIT_BURST);
> +
> + err = ntfs_parse_options(sb, data, silent, &sbi->options);
> + if (err)
> + goto out;
> +
> + if (!rq || !blk_queue_discard(rq) || !rq->limits.discard_granularity) {
> + ;
> + } else {
> + sbi->discard_granularity = rq->limits.discard_granularity;
> + sbi->discard_granularity_mask_inv =
> + ~(u64)(sbi->discard_granularity - 1);
> + }
> +
> + sb_set_blocksize(sb, PAGE_SIZE);
> +
> + /* parse boot */
> + err = ntfs_init_from_boot(sb, rq ? queue_logical_block_size(rq) : 512,
> + bd_inode->i_size);
> + if (err)
> + goto out;
> +
> + spin_lock_init(&sbi->compress.lock);
> + if (sbi->cluster_size <= NTFS_LZNT_MAX_CLUSTER) {
> + sbi->compress.frame_unc =
> + ntfs_alloc(sbi->cluster_size << NTFS_LZNT_CUNIT, 0);
> + if (!sbi->compress.frame_unc) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + sbi->compress.ctx = get_compression_ctx(true);
> + if (!sbi->compress.ctx) {
> + err = -ENOMEM;
> + goto out;
> + }
> + }
> +
> + /*
> + * Load $Volume. This should be done before $LogFile
> + * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'
> + */
> + ref.low = cpu_to_le32(MFT_REC_VOL);
> + ref.seq = cpu_to_le16(MFT_REC_VOL);
> + inode = ntfs_iget5(sb, &ref, &NAME_VOLUME);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + ntfs_err(sb, "Failed to load $Volume.");
> + inode = NULL;
> + goto out;
> + }
> +
> + ni = ntfs_i(inode);
> +
> + /* Load and save label (not necessary) */
> + attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL);
> +
> + if (!attr) {
> + ;
> + } else if (!attr->non_res && !is_attr_ext(attr)) {
> + /* $AttrDef allows labels to be up to 128 symbols */
> + err = utf16s_to_utf8s(resident_data(attr),
> + le32_to_cpu(attr->res.data_size) >> 1,
> + UTF16_LITTLE_ENDIAN, sbi->volume.label,
> + sizeof(sbi->volume.label));
> + if (err < 0)
> + sbi->volume.label[0] = 0;
> + } else {
> + /* should we break mounting here? */
> + //err = -EINVAL;
> + //goto out;
> + }
> +
> + attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL);
> + if (!attr || is_attr_ext(attr)) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO);
> + if (!info) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + sbi->volume.major_ver = info->major_ver;
> + sbi->volume.minor_ver = info->minor_ver;
> + sbi->volume.flags = info->flags;
> +
> + sbi->volume.ni = ni;
> + inode = NULL;
> +
> + /* Load $MFTMirr to estimate recs_mirr */
> + ref.low = cpu_to_le32(MFT_REC_MIRR);
> + ref.seq = cpu_to_le16(MFT_REC_MIRR);
> + inode = ntfs_iget5(sb, &ref, &NAME_MIRROR);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + ntfs_err(sb, "Failed to load $MFTMirr.");
> + inode = NULL;
> + goto out;
> + }
> +
> + sbi->mft.recs_mirr =
> + ntfs_up_cluster(sbi, inode->i_size) >> sbi->record_bits;
> +
> + iput(inode);
> +
> + /* Load $LogFile to replay */
> + ref.low = cpu_to_le32(MFT_REC_LOG);
> + ref.seq = cpu_to_le16(MFT_REC_LOG);
> + inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + ntfs_err(sb, "Failed to load $LogFile.");
> + inode = NULL;
> + goto out;
> + }
> +
> + ni = ntfs_i(inode);
> +
> + err = ntfs_loadlog_and_replay(ni, sbi);
> + if (err)
> + goto out;
> +
> + iput(inode);
> + inode = NULL;
> +
> + is_ro = sb_rdonly(sbi->sb);
> +
> + if (sbi->flags & NTFS_FLAGS_NEED_REPLAY) {
> + if (!is_ro) {
> + ntfs_warn(sb,
> + "failed to replay log file. Can't mount rw!");
> + err = -EINVAL;
> + goto out;
> + }
> + } else if (sbi->volume.flags & VOLUME_FLAG_DIRTY) {
> + if (!is_ro && !sbi->options.force) {
> + ntfs_warn(
> + sb,
> + "volume is dirty and \"force\" flag is not set!");
> + err = -EINVAL;
> + goto out;
> + }
> + }
> +
> + /* Load $MFT */
> + ref.low = cpu_to_le32(MFT_REC_MFT);
> + ref.seq = cpu_to_le16(1);
> +
> + inode = ntfs_iget5(sb, &ref, &NAME_MFT);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + ntfs_err(sb, "Failed to load $MFT.");
> + inode = NULL;
> + goto out;
> + }
> +
> + ni = ntfs_i(inode);
> +
> + sbi->mft.used = ni->i_valid >> sbi->record_bits;
> + tt = inode->i_size >> sbi->record_bits;
> + sbi->mft.next_free = MFT_REC_USER;
> +
> + err = wnd_init(&sbi->mft.bitmap, sb, tt);
> + if (err)
> + goto out;
> +
> + err = ni_load_all_mi(ni);
> + if (err)
> + goto out;
> +
> + sbi->mft.ni = ni;
> +
> + /* Load $BadClus */
> + ref.low = cpu_to_le32(MFT_REC_BADCLUST);
> + ref.seq = cpu_to_le16(MFT_REC_BADCLUST);
> + inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + ntfs_err(sb, "Failed to load $BadClus.");
> + inode = NULL;
> + goto out;
> + }
> +
> + ni = ntfs_i(inode);
> +
> + for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) {
> + if (lcn == SPARSE_LCN)
> + continue;
> +
> + if (!sbi->bad_clusters)
> + ntfs_notice(sb, "Volume contains bad blocks");
> +
> + sbi->bad_clusters += len;
> + }
> +
> + iput(inode);
> +
> + /* Load $Bitmap */
> + ref.low = cpu_to_le32(MFT_REC_BITMAP);
> + ref.seq = cpu_to_le16(MFT_REC_BITMAP);
> + inode = ntfs_iget5(sb, &ref, &NAME_BITMAP);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + ntfs_err(sb, "Failed to load $Bitmap.");
> + inode = NULL;
> + goto out;
> + }
> +
> + ni = ntfs_i(inode);
> +
> +#ifndef NTFS3_64BIT_CLUSTER
> + if (inode->i_size >> 32) {
> + err = -EINVAL;
> + goto out;
> + }
> +#endif
> +
> + /* Check bitmap boundary */
> + tt = sbi->used.bitmap.nbits;
> + if (inode->i_size < bitmap_size(tt)) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + /* Not necessary */
> + sbi->used.bitmap.set_tail = true;
> + err = wnd_init(&sbi->used.bitmap, sbi->sb, tt);
> + if (err)
> + goto out;
> +
> + iput(inode);
> +
> + /* Compute the mft zone */
> + err = ntfs_refresh_zone(sbi);
> + if (err)
> + goto out;
> +
> + /* Load $AttrDef */
> + ref.low = cpu_to_le32(MFT_REC_ATTR);
> + ref.seq = cpu_to_le16(MFT_REC_ATTR);
> + inode = ntfs_iget5(sbi->sb, &ref, &NAME_ATTRDEF);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + ntfs_err(sb, "Failed to load $AttrDef -> %d", err);
> + inode = NULL;
> + goto out;
> + }
> +
> + if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY)) {
> + err = -EINVAL;
> + goto out;
> + }
> + bytes = inode->i_size;
> + sbi->def_table = t = ntfs_alloc(bytes, 0);
> + if (!t) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) {
> + unsigned long tail = bytes - done;
> + struct page *page = ntfs_map_page(inode->i_mapping, idx);
> +
> + if (IS_ERR(page)) {
> + err = PTR_ERR(page);
> + goto out;
> + }
> + memcpy(Add2Ptr(t, done), page_address(page),
> + min(PAGE_SIZE, tail));
> + ntfs_unmap_page(page);
> +
> + if (!idx && ATTR_STD != t->type) {
> + err = -EINVAL;
> + goto out;
> + }
> + }
> +
> + t += 1;
> + sbi->def_entries = 1;
> + done = sizeof(struct ATTR_DEF_ENTRY);
> + sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE;
> +
> + while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) {
> + u32 t32 = le32_to_cpu(t->type);
> +
> + if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32)
> + break;
> +
> + if (t->type == ATTR_REPARSE)
> + sbi->reparse.max_size = le64_to_cpu(t->max_sz);
> +
> + done += sizeof(struct ATTR_DEF_ENTRY);
> + t += 1;
> + sbi->def_entries += 1;
> + }
> + iput(inode);
> +
> + /* Load $UpCase */
> + ref.low = cpu_to_le32(MFT_REC_UPCASE);
> + ref.seq = cpu_to_le16(MFT_REC_UPCASE);
> + inode = ntfs_iget5(sb, &ref, &NAME_UPCASE);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + ntfs_err(sb, "Failed to load $LogFile.");
> + inode = NULL;
> + goto out;
> + }
> +
> + ni = ntfs_i(inode);
> +
> + if (inode->i_size != 0x10000 * sizeof(short)) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + page_cache_readahead_unbounded(inode->i_mapping, NULL, 0,
> + 0x10000 * sizeof(short) / PAGE_SIZE, 0);
> +
> + sbi->upcase = upcase = ntfs_alloc(0x10000 * sizeof(short), 0);
> + if (!upcase) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) {
> + const u16 *src;
> + u16 *dst = Add2Ptr(upcase, idx << PAGE_SHIFT);
> + struct page *page = ntfs_map_page(inode->i_mapping, idx);
> +
> + if (IS_ERR(page)) {
> + err = PTR_ERR(page);
> + goto out;
> + }
> +
> + src = page_address(page);
> +
> +#ifdef __BIG_ENDIAN
> + for (i = 0; i < PAGE_SIZE / sizeof(u16); i++)
> + *dst++ = le16_to_cpu(*src++);
> +#else
> + memcpy(dst, src, PAGE_SIZE);
> +#endif
> + ntfs_unmap_page(page);
> + }
> +
> + shared = ntfs_set_shared(upcase, 0x10000 * sizeof(short));
> + if (shared && upcase != shared) {
> + sbi->upcase = shared;
> + ntfs_free(upcase);
> + }
> +
> + iput(inode);
> + inode = NULL;
> +
> + if (is_ntfs3(sbi)) {
> + /* Load $Secure */
> + err = ntfs_security_init(sbi);
> + if (err)
> + goto out;
> +
> + /* Load $Extend */
> + err = ntfs_extend_init(sbi);
> + if (err)
> + goto load_root;
> +
> + /* Load $Extend\$Reparse */
> + err = ntfs_reparse_init(sbi);
> + if (err)
> + goto load_root;
> +
> + /* Load $Extend\$ObjId */
> + err = ntfs_objid_init(sbi);
> + if (err)
> + goto load_root;
> + }
> +
> +load_root:
> +
> + /* Load root */
> + ref.low = cpu_to_le32(MFT_REC_ROOT);
> + ref.seq = cpu_to_le16(MFT_REC_ROOT);
> + inode = ntfs_iget5(sb, &ref, &NAME_ROOT);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + ntfs_err(sb, "Failed to load root.");
> + inode = NULL;
> + goto out;
> + }
> +
> + ni = ntfs_i(inode);
> +
> + sb->s_root = d_make_root(inode);
> +
> + if (!sb->s_root) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> + return 0;
> +
> +out:
> + iput(inode);
> +
> + if (sb->s_root) {
> + d_drop(sb->s_root);
> + sb->s_root = NULL;
> + }
> +
> + put_ntfs(sbi);
> +
> + sb->s_fs_info = NULL;
> + return err;
> +}
> +
> +void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len)
> +{
> + struct ntfs_sb_info *sbi = sb->s_fs_info;
> + struct block_device *bdev = sb->s_bdev;
> + sector_t devblock = (u64)lcn * sbi->blocks_per_cluster;
> + unsigned long blocks = (u64)len * sbi->blocks_per_cluster;
> + unsigned long cnt = 0;
> + unsigned long limit = global_zone_page_state(NR_FREE_PAGES)
> + << (PAGE_SHIFT - sb->s_blocksize_bits);
> +
> + if (limit >= 0x2000)
> + limit -= 0x1000;
> + else if (limit < 32)
> + limit = 32;
> + else
> + limit >>= 1;
> +
> + while (blocks--) {
> + clean_bdev_aliases(bdev, devblock++, 1);
> + if (cnt++ >= limit) {
> + sync_blockdev(bdev);
> + cnt = 0;
> + }
> + }
> +}
> +
> +/*
> + * ntfs_discard
> + *
> + * issue a discard request (trim for SSD)
> + */
> +int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len)
> +{
> + int err;
> + u64 lbo, bytes, start, end;
> + struct super_block *sb;
> +
> + if (sbi->used.next_free_lcn == lcn + len)
> + sbi->used.next_free_lcn = lcn;
> +
> + if (sbi->flags & NTFS_FLAGS_NODISCARD)
> + return -EOPNOTSUPP;
> +
> + if (!sbi->options.discard)
> + return -EOPNOTSUPP;
> +
> + lbo = (u64)lcn << sbi->cluster_bits;
> + bytes = (u64)len << sbi->cluster_bits;
> +
> + /* Align up 'start' on discard_granularity */
> + start = (lbo + sbi->discard_granularity - 1) &
> + sbi->discard_granularity_mask_inv;
> + /* Align down 'end' on discard_granularity */
> + end = (lbo + bytes) & sbi->discard_granularity_mask_inv;
> +
> + sb = sbi->sb;
> + if (start >= end)
> + return 0;
> +
> + err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9,
> + GFP_NOFS, 0);
> +
> + if (err == -EOPNOTSUPP)
> + sbi->flags |= NTFS_FLAGS_NODISCARD;
> +
> + return err;
> +}
> +
> +static struct dentry *ntfs_mount(struct file_system_type *fs_type, int flags,
> + const char *dev_name, void *data)
> +{
> + return mount_bdev(fs_type, flags, dev_name, data, ntfs_fill_super);
> +}
> +
> +static struct file_system_type ntfs_fs_type = {
> + .owner = THIS_MODULE,
> + .name = "ntfs3",
> + .mount = ntfs_mount,
> + .kill_sb = kill_block_super,
> + .fs_flags = FS_REQUIRES_DEV,
> +};
> +
> +static int __init init_ntfs_fs(void)
> +{
> + int err;
> +
> +#ifdef NTFS3_INDEX_BINARY_SEARCH
> + pr_notice("ntfs3: +index binary search");
> +#endif
> +
> +#ifdef NTFS3_CHECK_FREE_CLST
> + pr_notice("ntfs3: +check free clusters");
> +#endif
> +
> +#if NTFS_LINK_MAX < 0xffff
> + pr_notice("ntfs3: max link count %u", NTFS_LINK_MAX);
> +#endif
> +
> +#ifdef NTFS3_64BIT_CLUSTER
> + pr_notice("ntfs3: 64 bits per cluster");
> +#else
> + pr_notice("ntfs3: 32 bits per cluster");
> +#endif
> +
> + ntfs_inode_cachep = kmem_cache_create(
> + "ntfs_inode_cache", sizeof(struct ntfs_inode), 0,
> + (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT),
> + init_once);
> + if (!ntfs_inode_cachep) {
> + err = -ENOMEM;
> + goto failed;
> + }
> +
> + err = register_filesystem(&ntfs_fs_type);
> + if (!err)
> + return 0;
> +
> +failed:
> + return err;
> +}
> +
> +static void __exit exit_ntfs_fs(void)
> +{
> + if (ntfs_inode_cachep) {
> + rcu_barrier();
> + kmem_cache_destroy(ntfs_inode_cachep);
> + }
> +
> + unregister_filesystem(&ntfs_fs_type);
> +}
> +
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("ntfs3 filesystem");
> +MODULE_AUTHOR("Konstantin Komarov");
> +MODULE_ALIAS_FS("ntfs3");
> +
> +module_init(init_ntfs_fs) module_exit(exit_ntfs_fs)
Powered by blists - more mailing lists