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fsntfs.c
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// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
*
*/
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"
// clang-format off
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'),
};
#ifdef CONFIG_NTFS3_LZX_XPRESS
const __le16 WOF_NAME[17] = {
cpu_to_le16('W'), cpu_to_le16('o'), cpu_to_le16('f'), cpu_to_le16('C'),
cpu_to_le16('o'), cpu_to_le16('m'), cpu_to_le16('p'), cpu_to_le16('r'),
cpu_to_le16('e'), cpu_to_le16('s'), cpu_to_le16('s'), cpu_to_le16('e'),
cpu_to_le16('d'), cpu_to_le16('D'), cpu_to_le16('a'), cpu_to_le16('t'),
cpu_to_le16('a'),
};
#endif
// clang-format on
/*
* ntfs_fix_pre_write - Insert 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.
*
* Return: < 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) {
/* Fixup does not match! Is it serious error? */
ret = -E_NTFS_FIXUP;
}
/* Replace fixup. */
*ptr = *++fixup;
ptr += SECTOR_SIZE / sizeof(short);
}
return ret;
}
/*
* ntfs_extend_init - Load $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;
bool initialized = false;
struct MFT_REF ref;
struct inode *inode;
/* Check for 4GB. */
if (ni->vfs_inode.i_size >= 0x100000000ull) {
ntfs_err(sb, "\x24LogFile 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);
/* LogFile should not contains attribute list. */
err = ni_load_all_mi(sbi->mft.ni);
if (!err)
err = log_replay(ni, &initialized);
iput(inode);
sbi->mft.ni = NULL;
sync_blockdev(sb->s_bdev);
invalidate_bdev(sb->s_bdev);
if (sbi->flags & NTFS_FLAGS_NEED_REPLAY) {
err = 0;
goto out;
}
if (sb_rdonly(sb) || !initialized)
goto out;
/* Fill LogFile by '-1' if it is initialized. */
err = ntfs_bio_fill_1(sbi, &ni->file.run);
out:
sbi->flags &= ~NTFS_FLAGS_LOG_REPLAYING;
return err;
}
/*
* ntfs_query_def
*
* Return: 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 - Look 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;
CLST alen;
struct super_block *sb = sbi->sb;
size_t alcn, 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) {
zlen = wnd_zone_len(wnd);
if (!zlen) {
err = ntfs_refresh_zone(sbi);
if (err)
goto up_write;
zlen = wnd_zone_len(wnd);
}
if (!zlen) {
ntfs_err(sbi->sb, "no free space to extend mft");
err = -ENOSPC;
goto up_write;
}
lcn = wnd_zone_bit(wnd);
alen = min_t(CLST, len, zlen);
wnd_zone_set(wnd, lcn + alen, zlen - alen);
err = wnd_set_used(wnd, lcn, alen);
if (err)
goto up_write;
alcn = lcn;
goto space_found;
}
/*
* '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;
alen = wnd_find(wnd, len, lcn, BITMAP_FIND_MARK_AS_USED, &alcn);
if (alen)
goto space_found;
/* Try to use clusters from MftZone. */
zlen = wnd_zone_len(wnd);
zeroes = wnd_zeroes(wnd);
/* Check too big request */
if (len > zeroes + zlen || zlen <= NTFS_MIN_MFT_ZONE) {
err = -ENOSPC;
goto up_write;
}
/* How many clusters to cat from zone. */
zlcn = wnd_zone_bit(wnd);
zlen2 = zlen >> 1;
ztrim = clamp_val(len, zlen2, zlen);
new_zlen = max_t(size_t, zlen - ztrim, NTFS_MIN_MFT_ZONE);
wnd_zone_set(wnd, zlcn, new_zlen);
/* Allocate continues clusters. */
alen = wnd_find(wnd, len, 0,
BITMAP_FIND_MARK_AS_USED | BITMAP_FIND_FULL, &alcn);
if (!alen) {
err = -ENOSPC;
goto up_write;
}
space_found:
err = 0;
*new_len = alen;
*new_lcn = alcn;
ntfs_unmap_meta(sb, alcn, alen);
/* Set hint for next requests. */
if (!(opt & ALLOCATE_MFT))
sbi->used.next_free_lcn = alcn + alen;
up_write:
up_write(&wnd->rw_lock);
return err;
}
/*
* ntfs_extend_mft - Allocate 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 - Look 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 - Mark 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 - Format 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 - Refresh 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 - Update $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;
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_DIRTY);
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:
ni_unlock(ni);
if (err)
return err;
mark_inode_dirty(&ni->vfs_inode);
/* verify(!ntfs_update_mftmirr()); */
/*
* If we used wait=1, sync_inode_metadata waits for the io for the
* inode to finish. It hangs when media is removed.
* So wait=0 is sent down to sync_inode_metadata
* and filemap_fdatawrite is used for the data blocks.
*/
err = sync_inode_metadata(&ni->vfs_inode, 0);
if (!err)
err = filemap_fdatawrite(ni->vfs_inode.i_mapping);
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)