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linux/fs/ntfs3/fsntfs.c
Dan Carpenter 365ab49915 fs/ntfs3: remove unnecessary NULL check 
This code triggers a Smatch warning:

    fs/ntfs3/fsntfs.c:1606 ntfs_bio_fill_1()
    warn: variable dereferenced before check 'bio' (see line 1591)

The "bio" pointer cannot be NULL so there is no need to check.
Originally there was more extensive NULL checking but it was removed
because bio_alloc() will never fail if it is allowed to sleep.

Remove this check as well.

Fixes: 39146b6f66 ("ntfs3: remove ntfs_alloc_bio")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220128140922.GA29766@kili
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-02-02 07:50:55 -07:00

2483 lines
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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)
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, const struct runs_tree *run,
u64 vbo, const void *buf, size_t bytes, int sync)
{
struct super_block *sb = sbi->sb;
u8 cluster_bits = sbi->cluster_bits;
u32 off = vbo & sbi->cluster_mask;
CLST lcn, clen, vcn = vbo >> cluster_bits, vcn_next;
u64 lbo, len;
size_t idx;
if (!run_lookup_entry(run, vcn, &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 = min_t(u64, len, bytes);
int err = ntfs_sb_write(sb, lbo, op, buf, sync);
if (err)
return err;
bytes -= op;
if (!bytes)
break;
vcn_next = vcn + clen;
if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) ||
vcn != vcn_next)
return -ENOENT;
if (lcn == SPARSE_LCN)
return -EINVAL;
if (buf)
buf = Add2Ptr(buf, op);
lbo = ((u64)lcn << cluster_bits);
len = ((u64)clen << cluster_bits);
}
return 0;
}
struct buffer_head *ntfs_bread_run(struct ntfs_sb_info *sbi,
const 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, const 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 vcn_next, vcn = vbo >> cluster_bits;
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, vcn, &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);
vcn_next = vcn + clen;
if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) ||
vcn != vcn_next) {
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;
}
/*
* ntfs_read_bh
*
* Return: < 0 if error, 0 if ok, -E_NTFS_FIXUP if need to update fixups.
*/
int ntfs_read_bh(struct ntfs_sb_info *sbi, const 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, const 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;
CLST vcn_next, vcn = vbo >> cluster_bits;
u32 off;
u32 nbh = 0;
CLST lcn, clen;
u64 lbo, len;
size_t idx;
nb->bytes = bytes;
if (!run_lookup_entry(run, vcn, &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 = min_t(u64, 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);
vcn_next = vcn + clen;
if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) ||
vcn != vcn_next) {
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;
}
/*
* ntfs_bio_pages - Read/write pages from/to disk.
*/
int ntfs_bio_pages(struct ntfs_sb_info *sbi, const struct runs_tree *run,
struct page **pages, u32 nr_pages, u64 vbo, u32 bytes,
u32 op)
{
int err = 0;
struct bio *new, *bio = NULL;
struct super_block *sb = sbi->sb;
struct block_device *bdev = sb->s_bdev;
struct page *page;
u8 cluster_bits = sbi->cluster_bits;
CLST lcn, clen, vcn, vcn_next;
u32 add, off, page_idx;
u64 lbo, len;
size_t run_idx;
struct blk_plug plug;
if (!bytes)
return 0;
blk_start_plug(&plug);
/* Align vbo and bytes to be 512 bytes aligned. */
lbo = (vbo + bytes + 511) & ~511ull;
vbo = vbo & ~511ull;
bytes = lbo - vbo;
vcn = vbo >> cluster_bits;
if (!run_lookup_entry(run, vcn, &lcn, &clen, &run_idx)) {
err = -ENOENT;
goto out;
}
off = vbo & sbi->cluster_mask;
page_idx = 0;
page = pages[0];
for (;;) {
lbo = ((u64)lcn << cluster_bits) + off;
len = ((u64)clen << cluster_bits) - off;
new_bio:
new = bio_alloc(bdev, nr_pages - page_idx, op, GFP_NOFS);
if (bio) {
bio_chain(bio, new);
submit_bio(bio);
}
bio = new;
bio->bi_iter.bi_sector = lbo >> 9;
while (len) {
off = vbo & (PAGE_SIZE - 1);
add = off + len > PAGE_SIZE ? (PAGE_SIZE - off) : len;
if (bio_add_page(bio, page, add, off) < add)
goto new_bio;
if (bytes <= add)
goto out;
bytes -= add;
vbo += add;
if (add + off == PAGE_SIZE) {
page_idx += 1;
if (WARN_ON(page_idx >= nr_pages)) {
err = -EINVAL;
goto out;
}
page = pages[page_idx];
}
if (len <= add)
break;
len -= add;
lbo += add;
}
vcn_next = vcn + clen;
if (!run_get_entry(run, ++run_idx, &vcn, &lcn, &clen) ||
vcn != vcn_next) {
err = -ENOENT;
goto out;
}
off = 0;
}
out:
if (bio) {
if (!err)
err = submit_bio_wait(bio);
bio_put(bio);
}
blk_finish_plug(&plug);
return err;
}
/*
* ntfs_bio_fill_1 - Helper for ntfs_loadlog_and_replay().
*
* Fill on-disk logfile range by (-1)
* this means empty logfile.
*/
int ntfs_bio_fill_1(struct ntfs_sb_info *sbi, const struct runs_tree *run)
{
int err = 0;
struct super_block *sb = sbi->sb;
struct block_device *bdev = sb->s_bdev;
u8 cluster_bits = sbi->cluster_bits;
struct bio *new, *bio = NULL;
CLST lcn, clen;
u64 lbo, len;
size_t run_idx;
struct page *fill;
void *kaddr;
struct blk_plug plug;
fill = alloc_page(GFP_KERNEL);
if (!fill)
return -ENOMEM;
kaddr = kmap_atomic(fill);
memset(kaddr, -1, PAGE_SIZE);
kunmap_atomic(kaddr);
flush_dcache_page(fill);
lock_page(fill);
if (!run_lookup_entry(run, 0, &lcn, &clen, &run_idx)) {
err = -ENOENT;
goto out;
}
/*
* TODO: Try blkdev_issue_write_same.
*/
blk_start_plug(&plug);
do {
lbo = (u64)lcn << cluster_bits;
len = (u64)clen << cluster_bits;
new_bio:
new = bio_alloc(bdev, BIO_MAX_VECS, REQ_OP_WRITE, GFP_NOFS);
if (bio) {
bio_chain(bio, new);
submit_bio(bio);
}
bio = new;
bio->bi_iter.bi_sector = lbo >> 9;
for (;;) {
u32 add = len > PAGE_SIZE ? PAGE_SIZE : len;
if (bio_add_page(bio, fill, add, 0) < add)
goto new_bio;
lbo += add;
if (len <= add)
break;
len -= add;
}
} while (run_get_entry(run, ++run_idx, NULL, &lcn, &clen));
if (!err)
err = submit_bio_wait(bio);
bio_put(bio);
blk_finish_plug(&plug);
out:
unlock_page(fill);
put_page(fill);
return err;
}
int ntfs_vbo_to_lbo(struct ntfs_sb_info *sbi, const 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);
static inline u32 sid_length(const struct SID *sid)
{
return struct_size(sid, SubAuthority, sid->SubAuthorityCount);
}
/*
* is_acl_valid
*
* Thanks Mark Harmstone for idea.
*/
static bool is_acl_valid(const struct ACL *acl, u32 len)
{
const struct ACE_HEADER *ace;
u32 i;
u16 ace_count, ace_size;
if (acl->AclRevision != ACL_REVISION &&
acl->AclRevision != ACL_REVISION_DS) {
/*
* This value should be ACL_REVISION, unless the ACL contains an
* object-specific ACE, in which case this value must be ACL_REVISION_DS.
* All ACEs in an ACL must be at the same revision level.
*/
return false;
}
if (acl->Sbz1)
return false;
if (le16_to_cpu(acl->AclSize) > len)
return false;
if (acl->Sbz2)
return false;
len -= sizeof(struct ACL);
ace = (struct ACE_HEADER *)&acl[1];
ace_count = le16_to_cpu(acl->AceCount);
for (i = 0; i < ace_count; i++) {
if (len < sizeof(struct ACE_HEADER))
return false;
ace_size = le16_to_cpu(ace->AceSize);
if (len < ace_size)
return false;
len -= ace_size;
ace = Add2Ptr(ace, ace_size);
}
return true;
}
bool is_sd_valid(const struct SECURITY_DESCRIPTOR_RELATIVE *sd, u32 len)
{
u32 sd_owner, sd_group, sd_sacl, sd_dacl;
if (len < sizeof(struct SECURITY_DESCRIPTOR_RELATIVE))
return false;
if (sd->Revision != 1)
return false;
if (sd->Sbz1)
return false;
if (!(sd->Control & SE_SELF_RELATIVE))
return false;
sd_owner = le32_to_cpu(sd->Owner);
if (sd_owner) {
const struct SID *owner = Add2Ptr(sd, sd_owner);
if (sd_owner + offsetof(struct SID, SubAuthority) > len)
return false;
if (owner->Revision != 1)
return false;
if (sd_owner + sid_length(owner) > len)
return false;
}
sd_group = le32_to_cpu(sd->Group);
if (sd_group) {
const struct SID *group = Add2Ptr(sd, sd_group);
if (sd_group + offsetof(struct SID, SubAuthority) > len)
return false;
if (group->Revision != 1)
return false;
if (sd_group + sid_length(group) > len)
return false;
}
sd_sacl = le32_to_cpu(sd->Sacl);
if (sd_sacl) {
const struct ACL *sacl = Add2Ptr(sd, sd_sacl);
if (sd_sacl + sizeof(struct ACL) > len)
return false;
if (!is_acl_valid(sacl, len - sd_sacl))
return false;
}
sd_dacl = le32_to_cpu(sd->Dacl);
if (sd_dacl) {
const struct ACL *dacl = Add2Ptr(sd, sd_dacl);
if (sd_dacl + sizeof(struct ACL) > len)
return false;
if (!is_acl_valid(dacl, len - sd_dacl))
return false;
}
return true;
}
/*
* ntfs_security_init - Load 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 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();
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 =
ALIGN(sds_size - SecurityDescriptorsBlockSize, 16);
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;
}
sbi->security.ni = ni;
inode = NULL;
out:
iput(inode);
fnd_put(fnd_sii);
return err;
}
/*
* ntfs_get_security_by_id - Read security descriptor by id.
*/
int ntfs_get_security_by_id(struct ntfs_sb_info *sbi, __le32 security_id,
struct SECURITY_DESCRIPTOR_RELATIVE **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;
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_SECURITY);
fnd_sii = fnd_get();
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 = kmalloc(*size, GFP_NOFS);
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:
kfree(p);
fnd_put(fnd_sii);
ni_unlock(ni);
return err;
}
/*
* ntfs_insert_security - Insert 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 struct SECURITY_DESCRIPTOR_RELATIVE *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 = ALIGN(new_sec_size, 16);
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 = kzalloc(aligned_sec_size, GFP_NOFS);
if (!d_security)
return -ENOMEM;
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_SECURITY);
fnd_sdh = fnd_get();
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, 0);
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, 0);
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, 0);
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, 0);
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);
mark_inode_dirty(&ni->vfs_inode);
ni_unlock(ni);
kfree(d_security);
return err;
}
/*
* ntfs_reparse_init - Load 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 - Load 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;
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_OBJID);
err = indx_delete_entry(indx, ni, guid, sizeof(*guid), NULL);
mark_inode_dirty(&ni->vfs_inode);
ni_unlock(ni);
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.de.view.data_off = cpu_to_le16(offsetof(struct NTFS_DE_R, zero));
re.de.size = cpu_to_le16(sizeof(struct NTFS_DE_R));
re.de.key_size = cpu_to_le16(sizeof(re.key));
re.key.ReparseTag = rtag;
memcpy(&re.key.ref, ref, sizeof(*ref));
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_REPARSE);
err = indx_insert_entry(indx, ni, &re.de, NULL, NULL, 0);
mark_inode_dirty(&ni->vfs_inode);
ni_unlock(ni);
return err;
}
int ntfs_remove_reparse(struct ntfs_sb_info *sbi, __le32 rtag,
const struct MFT_REF *ref)
{
int err, diff;
struct ntfs_inode *ni = sbi->reparse.ni;
struct ntfs_index *indx = &sbi->reparse.index_r;
struct ntfs_fnd *fnd = NULL;
struct REPARSE_KEY rkey;
struct NTFS_DE_R *re;
struct INDEX_ROOT *root_r;
if (!ni)
return -EINVAL;
rkey.ReparseTag = rtag;
rkey.ref = *ref;
mutex_lock_nested(&ni->ni_lock, NTFS_INODE_MUTEX_REPARSE);
if (rtag) {
err = indx_delete_entry(indx, ni, &rkey, sizeof(rkey), NULL);
goto out1;
}
fnd = fnd_get();
if (!fnd) {
err = -ENOMEM;
goto out1;
}
root_r = indx_get_root(indx, ni, NULL, NULL);
if (!root_r) {
err = -EINVAL;
goto out;
}
/* 1 - forces to ignore rkey.ReparseTag when comparing keys. */
err = indx_find(indx, ni, root_r, &rkey, sizeof(rkey), (void *)1, &diff,
(struct NTFS_DE **)&re, fnd);
if (err)
goto out;
if (memcmp(&re->key.ref, ref, sizeof(*ref))) {
/* Impossible. Looks like volume corrupt? */
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:
mark_inode_dirty(&ni->vfs_inode);
ni_unlock(ni);
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;
}
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