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android-kvm / linux / ad52c55e1d3a2e85e05e47b6d7056c662a9c0246 / . / fs / ntfs3 / attrib.c
blob: 0763202d00c9924579934160b0555d2d9ded8615 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
*
* TODO: Merge attr_set_size/attr_data_get_block/attr_allocate_frame?
*/
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"
/*
* You can set external NTFS_MIN_LOG2_OF_CLUMP/NTFS_MAX_LOG2_OF_CLUMP to manage
* preallocate algorithm.
*/
#ifndef NTFS_MIN_LOG2_OF_CLUMP
#define NTFS_MIN_LOG2_OF_CLUMP 16
#endif
#ifndef NTFS_MAX_LOG2_OF_CLUMP
#define NTFS_MAX_LOG2_OF_CLUMP 26
#endif
// 16M
#define NTFS_CLUMP_MIN (1 << (NTFS_MIN_LOG2_OF_CLUMP + 8))
// 16G
#define NTFS_CLUMP_MAX (1ull << (NTFS_MAX_LOG2_OF_CLUMP + 8))
static inline u64 get_pre_allocated(u64 size)
{
u32 clump;
u8 align_shift;
u64 ret;
if (size <= NTFS_CLUMP_MIN) {
clump = 1 << NTFS_MIN_LOG2_OF_CLUMP;
align_shift = NTFS_MIN_LOG2_OF_CLUMP;
} else if (size >= NTFS_CLUMP_MAX) {
clump = 1 << NTFS_MAX_LOG2_OF_CLUMP;
align_shift = NTFS_MAX_LOG2_OF_CLUMP;
} else {
align_shift = NTFS_MIN_LOG2_OF_CLUMP - 1 +
__ffs(size >> (8 + NTFS_MIN_LOG2_OF_CLUMP));
clump = 1u << align_shift;
}
ret = (((size + clump - 1) >> align_shift)) << align_shift;
return ret;
}
/*
* attr_load_runs - Load all runs stored in @attr.
*/
static int attr_load_runs(struct ATTRIB *attr, struct ntfs_inode *ni,
struct runs_tree *run, const CLST *vcn)
{
int err;
CLST svcn = le64_to_cpu(attr->nres.svcn);
CLST evcn = le64_to_cpu(attr->nres.evcn);
u32 asize;
u16 run_off;
if (svcn >= evcn + 1 || run_is_mapped_full(run, svcn, evcn))
return 0;
if (vcn && (evcn < *vcn || *vcn < svcn))
return -EINVAL;
asize = le32_to_cpu(attr->size);
run_off = le16_to_cpu(attr->nres.run_off);
if (run_off > asize)
return -EINVAL;
err = run_unpack_ex(run, ni->mi.sbi, ni->mi.rno, svcn, evcn,
vcn ? *vcn : svcn, Add2Ptr(attr, run_off),
asize - run_off);
if (err < 0)
return err;
return 0;
}
/*
* run_deallocate_ex - Deallocate clusters.
*/
static int run_deallocate_ex(struct ntfs_sb_info *sbi, struct runs_tree *run,
CLST vcn, CLST len, CLST *done, bool trim)
{
int err = 0;
CLST vcn_next, vcn0 = vcn, lcn, clen, dn = 0;
size_t idx;
if (!len)
goto out;
if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) {
failed:
run_truncate(run, vcn0);
err = -EINVAL;
goto out;
}
for (;;) {
if (clen > len)
clen = len;
if (!clen) {
err = -EINVAL;
goto out;
}
if (lcn != SPARSE_LCN) {
if (sbi) {
/* mark bitmap range [lcn + clen) as free and trim clusters. */
mark_as_free_ex(sbi, lcn, clen, trim);
}
dn += clen;
}
len -= clen;
if (!len)
break;
vcn_next = vcn + clen;
if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) ||
vcn != vcn_next) {
/* Save memory - don't load entire run. */
goto failed;
}
}
out:
if (done)
*done += dn;
return err;
}
/*
* attr_allocate_clusters - Find free space, mark it as used and store in @run.
*/
int attr_allocate_clusters(struct ntfs_sb_info *sbi, struct runs_tree *run,
CLST vcn, CLST lcn, CLST len, CLST *pre_alloc,
enum ALLOCATE_OPT opt, CLST *alen, const size_t fr,
CLST *new_lcn, CLST *new_len)
{
int err;
CLST flen, vcn0 = vcn, pre = pre_alloc ? *pre_alloc : 0;
size_t cnt = run->count;
for (;;) {
err = ntfs_look_for_free_space(sbi, lcn, len + pre, &lcn, &flen,
opt);
if (err == -ENOSPC && pre) {
pre = 0;
if (*pre_alloc)
*pre_alloc = 0;
continue;
}
if (err)
goto out;
if (vcn == vcn0) {
/* Return the first fragment. */
if (new_lcn)
*new_lcn = lcn;
if (new_len)
*new_len = flen;
}
/* Add new fragment into run storage. */
if (!run_add_entry(run, vcn, lcn, flen, opt & ALLOCATE_MFT)) {
/* Undo last 'ntfs_look_for_free_space' */
mark_as_free_ex(sbi, lcn, len, false);
err = -ENOMEM;
goto out;
}
if (opt & ALLOCATE_ZERO) {
u8 shift = sbi->cluster_bits - SECTOR_SHIFT;
err = blkdev_issue_zeroout(sbi->sb->s_bdev,
(sector_t)lcn << shift,
(sector_t)flen << shift,
GFP_NOFS, 0);
if (err)
goto out;
}
vcn += flen;
if (flen >= len || (opt & ALLOCATE_MFT) ||
(fr && run->count - cnt >= fr)) {
*alen = vcn - vcn0;
return 0;
}
len -= flen;
}
out:
/* Undo 'ntfs_look_for_free_space' */
if (vcn - vcn0) {
run_deallocate_ex(sbi, run, vcn0, vcn - vcn0, NULL, false);
run_truncate(run, vcn0);
}
return err;
}
/*
* attr_make_nonresident
*
* If page is not NULL - it is already contains resident data
* and locked (called from ni_write_frame()).
*/
int attr_make_nonresident(struct ntfs_inode *ni, struct ATTRIB *attr,
struct ATTR_LIST_ENTRY *le, struct mft_inode *mi,
u64 new_size, struct runs_tree *run,
struct ATTRIB **ins_attr, struct page *page)
{
struct ntfs_sb_info *sbi;
struct ATTRIB *attr_s;
struct MFT_REC *rec;
u32 used, asize, rsize, aoff;
bool is_data;
CLST len, alen;
char *next;
int err;
if (attr->non_res) {
*ins_attr = attr;
return 0;
}
sbi = mi->sbi;
rec = mi->mrec;
attr_s = NULL;
used = le32_to_cpu(rec->used);
asize = le32_to_cpu(attr->size);
next = Add2Ptr(attr, asize);
aoff = PtrOffset(rec, attr);
rsize = le32_to_cpu(attr->res.data_size);
is_data = attr->type == ATTR_DATA && !attr->name_len;
/* len - how many clusters required to store 'rsize' bytes */
if (is_attr_compressed(attr)) {
u8 shift = sbi->cluster_bits + NTFS_LZNT_CUNIT;
len = ((rsize + (1u << shift) - 1) >> shift) << NTFS_LZNT_CUNIT;
} else {
len = bytes_to_cluster(sbi, rsize);
}
run_init(run);
/* Make a copy of original attribute. */
attr_s = kmemdup(attr, asize, GFP_NOFS);
if (!attr_s) {
err = -ENOMEM;
goto out;
}
if (!len) {
/* Empty resident -> Empty nonresident. */
alen = 0;
} else {
const char *data = resident_data(attr);
err = attr_allocate_clusters(sbi, run, 0, 0, len, NULL,
ALLOCATE_DEF, &alen, 0, NULL,
NULL);
if (err)
goto out1;
if (!rsize) {
/* Empty resident -> Non empty nonresident. */
} else if (!is_data) {
err = ntfs_sb_write_run(sbi, run, 0, data, rsize, 0);
if (err)
goto out2;
} else if (!page) {
struct address_space *mapping = ni->vfs_inode.i_mapping;
struct folio *folio;
folio = __filemap_get_folio(
mapping, 0, FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
mapping_gfp_mask(mapping));
if (IS_ERR(folio)) {
err = PTR_ERR(folio);
goto out2;
}
folio_fill_tail(folio, 0, data, rsize);
folio_mark_uptodate(folio);
folio_mark_dirty(folio);
folio_unlock(folio);
folio_put(folio);
}
}
/* Remove original attribute. */
used -= asize;
memmove(attr, Add2Ptr(attr, asize), used - aoff);
rec->used = cpu_to_le32(used);
mi->dirty = true;
if (le)
al_remove_le(ni, le);
err = ni_insert_nonresident(ni, attr_s->type, attr_name(attr_s),
attr_s->name_len, run, 0, alen,
attr_s->flags, &attr, NULL, NULL);
if (err)
goto out3;
kfree(attr_s);
attr->nres.data_size = cpu_to_le64(rsize);
attr->nres.valid_size = attr->nres.data_size;
*ins_attr = attr;
if (is_data)
ni->ni_flags &= ~NI_FLAG_RESIDENT;
/* Resident attribute becomes non resident. */
return 0;
out3:
attr = Add2Ptr(rec, aoff);
memmove(next, attr, used - aoff);
memcpy(attr, attr_s, asize);
rec->used = cpu_to_le32(used + asize);
mi->dirty = true;
out2:
/* Undo: do not trim new allocated clusters. */
run_deallocate(sbi, run, false);
run_close(run);
out1:
kfree(attr_s);
out:
return err;
}
/*
* attr_set_size_res - Helper for attr_set_size().
*/
static int attr_set_size_res(struct ntfs_inode *ni, struct ATTRIB *attr,
struct ATTR_LIST_ENTRY *le, struct mft_inode *mi,
u64 new_size, struct runs_tree *run,
struct ATTRIB **ins_attr)
{
struct ntfs_sb_info *sbi = mi->sbi;
struct MFT_REC *rec = mi->mrec;
u32 used = le32_to_cpu(rec->used);
u32 asize = le32_to_cpu(attr->size);
u32 aoff = PtrOffset(rec, attr);
u32 rsize = le32_to_cpu(attr->res.data_size);
u32 tail = used - aoff - asize;
char *next = Add2Ptr(attr, asize);
s64 dsize = ALIGN(new_size, 8) - ALIGN(rsize, 8);
if (dsize < 0) {
memmove(next + dsize, next, tail);
} else if (dsize > 0) {
if (used + dsize > sbi->max_bytes_per_attr)
return attr_make_nonresident(ni, attr, le, mi, new_size,
run, ins_attr, NULL);
memmove(next + dsize, next, tail);
memset(next, 0, dsize);
}
if (new_size > rsize)
memset(Add2Ptr(resident_data(attr), rsize), 0,
new_size - rsize);
rec->used = cpu_to_le32(used + dsize);
attr->size = cpu_to_le32(asize + dsize);
attr->res.data_size = cpu_to_le32(new_size);
mi->dirty = true;
*ins_attr = attr;
return 0;
}
/*
* attr_set_size - Change the size of attribute.
*
* Extend:
* - Sparse/compressed: No allocated clusters.
* - Normal: Append allocated and preallocated new clusters.
* Shrink:
* - No deallocate if @keep_prealloc is set.
*/
int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
const __le16 *name, u8 name_len, struct runs_tree *run,
u64 new_size, const u64 *new_valid, bool keep_prealloc,
struct ATTRIB **ret)
{
int err = 0;
struct ntfs_sb_info *sbi = ni->mi.sbi;
u8 cluster_bits = sbi->cluster_bits;
bool is_mft = ni->mi.rno == MFT_REC_MFT && type == ATTR_DATA &&
!name_len;
u64 old_valid, old_size, old_alloc, new_alloc, new_alloc_tmp;
struct ATTRIB *attr = NULL, *attr_b;
struct ATTR_LIST_ENTRY *le, *le_b;
struct mft_inode *mi, *mi_b;
CLST alen, vcn, lcn, new_alen, old_alen, svcn, evcn;
CLST next_svcn, pre_alloc = -1, done = 0;
bool is_ext, is_bad = false;
bool dirty = false;
u32 align;
struct MFT_REC *rec;
again:
alen = 0;
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, type, name, name_len, NULL,
&mi_b);
if (!attr_b) {
err = -ENOENT;
goto bad_inode;
}
if (!attr_b->non_res) {
err = attr_set_size_res(ni, attr_b, le_b, mi_b, new_size, run,
&attr_b);
if (err)
return err;
/* Return if file is still resident. */
if (!attr_b->non_res) {
dirty = true;
goto ok1;
}
/* Layout of records may be changed, so do a full search. */
goto again;
}
is_ext = is_attr_ext(attr_b);
align = sbi->cluster_size;
if (is_ext)
align <<= attr_b->nres.c_unit;
old_valid = le64_to_cpu(attr_b->nres.valid_size);
old_size = le64_to_cpu(attr_b->nres.data_size);
old_alloc = le64_to_cpu(attr_b->nres.alloc_size);
again_1:
old_alen = old_alloc >> cluster_bits;
new_alloc = (new_size + align - 1) & ~(u64)(align - 1);
new_alen = new_alloc >> cluster_bits;
if (keep_prealloc && new_size < old_size) {
attr_b->nres.data_size = cpu_to_le64(new_size);
mi_b->dirty = dirty = true;
goto ok;
}
vcn = old_alen - 1;
svcn = le64_to_cpu(attr_b->nres.svcn);
evcn = le64_to_cpu(attr_b->nres.evcn);
if (svcn <= vcn && vcn <= evcn) {
attr = attr_b;
le = le_b;
mi = mi_b;
} else if (!le_b) {
err = -EINVAL;
goto bad_inode;
} else {
le = le_b;
attr = ni_find_attr(ni, attr_b, &le, type, name, name_len, &vcn,
&mi);
if (!attr) {
err = -EINVAL;
goto bad_inode;
}
next_le_1:
svcn = le64_to_cpu(attr->nres.svcn);
evcn = le64_to_cpu(attr->nres.evcn);
}
/*
* Here we have:
* attr,mi,le - last attribute segment (containing 'vcn').
* attr_b,mi_b,le_b - base (primary) attribute segment.
*/
next_le:
rec = mi->mrec;
err = attr_load_runs(attr, ni, run, NULL);
if (err)
goto out;
if (new_size > old_size) {
CLST to_allocate;
size_t free;
if (new_alloc <= old_alloc) {
attr_b->nres.data_size = cpu_to_le64(new_size);
mi_b->dirty = dirty = true;
goto ok;
}
/*
* Add clusters. In simple case we have to:
* - allocate space (vcn, lcn, len)
* - update packed run in 'mi'
* - update attr->nres.evcn
* - update attr_b->nres.data_size/attr_b->nres.alloc_size
*/
to_allocate = new_alen - old_alen;
add_alloc_in_same_attr_seg:
lcn = 0;
if (is_mft) {
/* MFT allocates clusters from MFT zone. */
pre_alloc = 0;
} else if (is_ext) {
/* No preallocate for sparse/compress. */
pre_alloc = 0;
} else if (pre_alloc == -1) {
pre_alloc = 0;
if (type == ATTR_DATA && !name_len &&
sbi->options->prealloc) {
pre_alloc = bytes_to_cluster(
sbi, get_pre_allocated(
new_size)) -
new_alen;
}
/* Get the last LCN to allocate from. */
if (old_alen &&
!run_lookup_entry(run, vcn, &lcn, NULL, NULL)) {
lcn = SPARSE_LCN;
}
if (lcn == SPARSE_LCN)
lcn = 0;
else if (lcn)
lcn += 1;
free = wnd_zeroes(&sbi->used.bitmap);
if (to_allocate > free) {
err = -ENOSPC;
goto out;
}
if (pre_alloc && to_allocate + pre_alloc > free)
pre_alloc = 0;
}
vcn = old_alen;
if (is_ext) {
if (!run_add_entry(run, vcn, SPARSE_LCN, to_allocate,
false)) {
err = -ENOMEM;
goto out;
}
alen = to_allocate;
} else {
/* ~3 bytes per fragment. */
err = attr_allocate_clusters(
sbi, run, vcn, lcn, to_allocate, &pre_alloc,
is_mft ? ALLOCATE_MFT : ALLOCATE_DEF, &alen,
is_mft ? 0 :
(sbi->record_size -
le32_to_cpu(rec->used) + 8) /
3 +
1,
NULL, NULL);
if (err)
goto out;
}
done += alen;
vcn += alen;
if (to_allocate > alen)
to_allocate -= alen;
else
to_allocate = 0;
pack_runs:
err = mi_pack_runs(mi, attr, run, vcn - svcn);
if (err)
goto undo_1;
next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
new_alloc_tmp = (u64)next_svcn << cluster_bits;
attr_b->nres.alloc_size = cpu_to_le64(new_alloc_tmp);
mi_b->dirty = dirty = true;
if (next_svcn >= vcn && !to_allocate) {
/* Normal way. Update attribute and exit. */
attr_b->nres.data_size = cpu_to_le64(new_size);
goto ok;
}
/* At least two MFT to avoid recursive loop. */
if (is_mft && next_svcn == vcn &&
((u64)done << sbi->cluster_bits) >= 2 * sbi->record_size) {
new_size = new_alloc_tmp;
attr_b->nres.data_size = attr_b->nres.alloc_size;
goto ok;
}
if (le32_to_cpu(rec->used) < sbi->record_size) {
old_alen = next_svcn;
evcn = old_alen - 1;
goto add_alloc_in_same_attr_seg;
}
attr_b->nres.data_size = attr_b->nres.alloc_size;
if (new_alloc_tmp < old_valid)
attr_b->nres.valid_size = attr_b->nres.data_size;
if (type == ATTR_LIST) {
err = ni_expand_list(ni);
if (err)
goto undo_2;
if (next_svcn < vcn)
goto pack_runs;
/* Layout of records is changed. */
goto again;
}
if (!ni->attr_list.size) {
err = ni_create_attr_list(ni);
/* In case of error layout of records is not changed. */
if (err)
goto undo_2;
/* Layout of records is changed. */
}
if (next_svcn >= vcn) {
/* This is MFT data, repeat. */
goto again;
}
/* Insert new attribute segment. */
err = ni_insert_nonresident(ni, type, name, name_len, run,
next_svcn, vcn - next_svcn,
attr_b->flags, &attr, &mi, NULL);
/*
* Layout of records maybe changed.
* Find base attribute to update.
*/
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, type, name, name_len,
NULL, &mi_b);
if (!attr_b) {
err = -EINVAL;
goto bad_inode;
}
if (err) {
/* ni_insert_nonresident failed. */
attr = NULL;
goto undo_2;
}
/* keep runs for $MFT::$ATTR_DATA and $MFT::$ATTR_BITMAP. */
if (ni->mi.rno != MFT_REC_MFT)
run_truncate_head(run, evcn + 1);
svcn = le64_to_cpu(attr->nres.svcn);
evcn = le64_to_cpu(attr->nres.evcn);
/*
* Attribute is in consistency state.
* Save this point to restore to if next steps fail.
*/
old_valid = old_size = old_alloc = (u64)vcn << cluster_bits;
attr_b->nres.valid_size = attr_b->nres.data_size =
attr_b->nres.alloc_size = cpu_to_le64(old_size);
mi_b->dirty = dirty = true;
goto again_1;
}
if (new_size != old_size ||
(new_alloc != old_alloc && !keep_prealloc)) {
/*
* Truncate clusters. In simple case we have to:
* - update packed run in 'mi'
* - update attr->nres.evcn
* - update attr_b->nres.data_size/attr_b->nres.alloc_size
* - mark and trim clusters as free (vcn, lcn, len)
*/
CLST dlen = 0;
vcn = max(svcn, new_alen);
new_alloc_tmp = (u64)vcn << cluster_bits;
if (vcn > svcn) {
err = mi_pack_runs(mi, attr, run, vcn - svcn);
if (err)
goto out;
} else if (le && le->vcn) {
u16 le_sz = le16_to_cpu(le->size);
/*
* NOTE: List entries for one attribute are always
* the same size. We deal with last entry (vcn==0)
* and it is not first in entries array
* (list entry for std attribute always first).
* So it is safe to step back.
*/
mi_remove_attr(NULL, mi, attr);
if (!al_remove_le(ni, le)) {
err = -EINVAL;
goto bad_inode;
}
le = (struct ATTR_LIST_ENTRY *)((u8 *)le - le_sz);
} else {
attr->nres.evcn = cpu_to_le64((u64)vcn - 1);
mi->dirty = true;
}
attr_b->nres.alloc_size = cpu_to_le64(new_alloc_tmp);
if (vcn == new_alen) {
attr_b->nres.data_size = cpu_to_le64(new_size);
if (new_size < old_valid)
attr_b->nres.valid_size =
attr_b->nres.data_size;
} else {
if (new_alloc_tmp <=
le64_to_cpu(attr_b->nres.data_size))
attr_b->nres.data_size =
attr_b->nres.alloc_size;
if (new_alloc_tmp <
le64_to_cpu(attr_b->nres.valid_size))
attr_b->nres.valid_size =
attr_b->nres.alloc_size;
}
mi_b->dirty = dirty = true;
err = run_deallocate_ex(sbi, run, vcn, evcn - vcn + 1, &dlen,
true);
if (err)
goto out;
if (is_ext) {
/* dlen - really deallocated clusters. */
le64_sub_cpu(&attr_b->nres.total_size,
((u64)dlen << cluster_bits));
}
run_truncate(run, vcn);
if (new_alloc_tmp <= new_alloc)
goto ok;
old_size = new_alloc_tmp;
vcn = svcn - 1;
if (le == le_b) {
attr = attr_b;
mi = mi_b;
evcn = svcn - 1;
svcn = 0;
goto next_le;
}
if (le->type != type || le->name_len != name_len ||
memcmp(le_name(le), name, name_len * sizeof(short))) {
err = -EINVAL;
goto bad_inode;
}
err = ni_load_mi(ni, le, &mi);
if (err)
goto out;
attr = mi_find_attr(mi, NULL, type, name, name_len, &le->id);
if (!attr) {
err = -EINVAL;
goto bad_inode;
}
goto next_le_1;
}
ok:
if (new_valid) {
__le64 valid = cpu_to_le64(min(*new_valid, new_size));
if (attr_b->nres.valid_size != valid) {
attr_b->nres.valid_size = valid;
mi_b->dirty = true;
}
}
ok1:
if (ret)
*ret = attr_b;
if (((type == ATTR_DATA && !name_len) ||
(type == ATTR_ALLOC && name == I30_NAME))) {
/* Update inode_set_bytes. */
if (attr_b->non_res) {
new_alloc = le64_to_cpu(attr_b->nres.alloc_size);
if (inode_get_bytes(&ni->vfs_inode) != new_alloc) {
inode_set_bytes(&ni->vfs_inode, new_alloc);
dirty = true;
}
}
/* Don't forget to update duplicate information in parent. */
if (dirty) {
ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
mark_inode_dirty(&ni->vfs_inode);
}
}
return 0;
undo_2:
vcn -= alen;
attr_b->nres.data_size = cpu_to_le64(old_size);
attr_b->nres.valid_size = cpu_to_le64(old_valid);
attr_b->nres.alloc_size = cpu_to_le64(old_alloc);
/* Restore 'attr' and 'mi'. */
if (attr)
goto restore_run;
if (le64_to_cpu(attr_b->nres.svcn) <= svcn &&
svcn <= le64_to_cpu(attr_b->nres.evcn)) {
attr = attr_b;
le = le_b;
mi = mi_b;
} else if (!le_b) {
err = -EINVAL;
goto bad_inode;
} else {
le = le_b;
attr = ni_find_attr(ni, attr_b, &le, type, name, name_len,
&svcn, &mi);
if (!attr)
goto bad_inode;
}
restore_run:
if (mi_pack_runs(mi, attr, run, evcn - svcn + 1))
is_bad = true;
undo_1:
run_deallocate_ex(sbi, run, vcn, alen, NULL, false);
run_truncate(run, vcn);
out:
if (is_bad) {
bad_inode:
_ntfs_bad_inode(&ni->vfs_inode);
}
return err;
}
/*
* attr_data_get_block - Returns 'lcn' and 'len' for given 'vcn'.
*
* @new == NULL means just to get current mapping for 'vcn'
* @new != NULL means allocate real cluster if 'vcn' maps to hole
* @zero - zeroout new allocated clusters
*
* NOTE:
* - @new != NULL is called only for sparsed or compressed attributes.
* - new allocated clusters are zeroed via blkdev_issue_zeroout.
*/
int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
CLST *len, bool *new, bool zero)
{
int err = 0;
struct runs_tree *run = &ni->file.run;
struct ntfs_sb_info *sbi;
u8 cluster_bits;
struct ATTRIB *attr, *attr_b;
struct ATTR_LIST_ENTRY *le, *le_b;
struct mft_inode *mi, *mi_b;
CLST hint, svcn, to_alloc, evcn1, next_svcn, asize, end, vcn0, alen;
CLST alloc, evcn;
unsigned fr;
u64 total_size, total_size0;
int step = 0;
if (new)
*new = false;
/* Try to find in cache. */
down_read(&ni->file.run_lock);
if (!run_lookup_entry(run, vcn, lcn, len, NULL))
*len = 0;
up_read(&ni->file.run_lock);
if (*len && (*lcn != SPARSE_LCN || !new))
return 0; /* Fast normal way without allocation. */
/* No cluster in cache or we need to allocate cluster in hole. */
sbi = ni->mi.sbi;
cluster_bits = sbi->cluster_bits;
ni_lock(ni);
down_write(&ni->file.run_lock);
/* Repeat the code above (under write lock). */
if (!run_lookup_entry(run, vcn, lcn, len, NULL))
*len = 0;
if (*len) {
if (*lcn != SPARSE_LCN || !new)
goto out; /* normal way without allocation. */
if (clen > *len)
clen = *len;
}
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b);
if (!attr_b) {
err = -ENOENT;
goto out;
}
if (!attr_b->non_res) {
*lcn = RESIDENT_LCN;
*len = 1;
goto out;
}
asize = le64_to_cpu(attr_b->nres.alloc_size) >> cluster_bits;
if (vcn >= asize) {
if (new) {
err = -EINVAL;
} else {
*len = 1;
*lcn = SPARSE_LCN;
}
goto out;
}
svcn = le64_to_cpu(attr_b->nres.svcn);
evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
attr = attr_b;
le = le_b;
mi = mi_b;
if (le_b && (vcn < svcn || evcn1 <= vcn)) {
attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
&mi);
if (!attr) {
err = -EINVAL;
goto out;
}
svcn = le64_to_cpu(attr->nres.svcn);
evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
}
/* Load in cache actual information. */
err = attr_load_runs(attr, ni, run, NULL);
if (err)
goto out;
/* Check for compressed frame. */
err = attr_is_frame_compressed(ni, attr_b, vcn >> NTFS_LZNT_CUNIT,
&hint);
if (err)
goto out;
if (hint) {
/* if frame is compressed - don't touch it. */
*lcn = COMPRESSED_LCN;
/* length to the end of frame. */
*len = NTFS_LZNT_CLUSTERS - (vcn & (NTFS_LZNT_CLUSTERS - 1));
err = 0;
goto out;
}
if (!*len) {
if (run_lookup_entry(run, vcn, lcn, len, NULL)) {
if (*lcn != SPARSE_LCN || !new)
goto ok; /* Slow normal way without allocation. */
if (clen > *len)
clen = *len;
} else if (!new) {
/* Here we may return -ENOENT.
* In any case caller gets zero length. */
goto ok;
}
}
if (!is_attr_ext(attr_b)) {
/* The code below only for sparsed or compressed attributes. */
err = -EINVAL;
goto out;
}
vcn0 = vcn;
to_alloc = clen;
fr = (sbi->record_size - le32_to_cpu(mi->mrec->used) + 8) / 3 + 1;
/* Allocate frame aligned clusters.
* ntfs.sys usually uses 16 clusters per frame for sparsed or compressed.
* ntfs3 uses 1 cluster per frame for new created sparsed files. */
if (attr_b->nres.c_unit) {
CLST clst_per_frame = 1u << attr_b->nres.c_unit;
CLST cmask = ~(clst_per_frame - 1);
/* Get frame aligned vcn and to_alloc. */
vcn = vcn0 & cmask;
to_alloc = ((vcn0 + clen + clst_per_frame - 1) & cmask) - vcn;
if (fr < clst_per_frame)
fr = clst_per_frame;
zero = true;
/* Check if 'vcn' and 'vcn0' in different attribute segments. */
if (vcn < svcn || evcn1 <= vcn) {
struct ATTRIB *attr2;
/* Load runs for truncated vcn. */
attr2 = ni_find_attr(ni, attr_b, &le_b, ATTR_DATA, NULL,
0, &vcn, &mi);
if (!attr2) {
err = -EINVAL;
goto out;
}
evcn1 = le64_to_cpu(attr2->nres.evcn) + 1;
err = attr_load_runs(attr2, ni, run, NULL);
if (err)
goto out;
}
}
if (vcn + to_alloc > asize)
to_alloc = asize - vcn;
/* Get the last LCN to allocate from. */
hint = 0;
if (vcn > evcn1) {
if (!run_add_entry(run, evcn1, SPARSE_LCN, vcn - evcn1,
false)) {
err = -ENOMEM;
goto out;
}
} else if (vcn && !run_lookup_entry(run, vcn - 1, &hint, NULL, NULL)) {
hint = -1;
}
/* Allocate and zeroout new clusters. */
err = attr_allocate_clusters(sbi, run, vcn, hint + 1, to_alloc, NULL,
zero ? ALLOCATE_ZERO : ALLOCATE_DEF, &alen,
fr, lcn, len);
if (err)
goto out;
*new = true;
step = 1;
end = vcn + alen;
/* Save 'total_size0' to restore if error. */
total_size0 = le64_to_cpu(attr_b->nres.total_size);
total_size = total_size0 + ((u64)alen << cluster_bits);
if (vcn != vcn0) {
if (!run_lookup_entry(run, vcn0, lcn, len, NULL)) {
err = -EINVAL;
goto out;
}
if (*lcn == SPARSE_LCN) {
/* Internal error. Should not happened. */
WARN_ON(1);
err = -EINVAL;
goto out;
}
/* Check case when vcn0 + len overlaps new allocated clusters. */
if (vcn0 + *len > end)
*len = end - vcn0;
}
repack:
err = mi_pack_runs(mi, attr, run, max(end, evcn1) - svcn);
if (err)
goto out;
attr_b->nres.total_size = cpu_to_le64(total_size);
inode_set_bytes(&ni->vfs_inode, total_size);
ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
mi_b->dirty = true;
mark_inode_dirty(&ni->vfs_inode);
/* Stored [vcn : next_svcn) from [vcn : end). */
next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
if (end <= evcn1) {
if (next_svcn == evcn1) {
/* Normal way. Update attribute and exit. */
goto ok;
}
/* Add new segment [next_svcn : evcn1 - next_svcn). */
if (!ni->attr_list.size) {
err = ni_create_attr_list(ni);
if (err)
goto undo1;
/* Layout of records is changed. */
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL,
0, NULL, &mi_b);
if (!attr_b) {
err = -ENOENT;
goto out;
}
attr = attr_b;
le = le_b;
mi = mi_b;
goto repack;
}
}
/*
* The code below may require additional cluster (to extend attribute list)
* and / or one MFT record
* It is too complex to undo operations if -ENOSPC occurs deep inside
* in 'ni_insert_nonresident'.
* Return in advance -ENOSPC here if there are no free cluster and no free MFT.
*/
if (!ntfs_check_for_free_space(sbi, 1, 1)) {
/* Undo step 1. */
err = -ENOSPC;
goto undo1;
}
step = 2;
svcn = evcn1;
/* Estimate next attribute. */
attr = ni_find_attr(ni, attr, &le, ATTR_DATA, NULL, 0, &svcn, &mi);
if (!attr) {
/* Insert new attribute segment. */
goto ins_ext;
}
/* Try to update existed attribute segment. */
alloc = bytes_to_cluster(sbi, le64_to_cpu(attr_b->nres.alloc_size));
evcn = le64_to_cpu(attr->nres.evcn);
if (end < next_svcn)
end = next_svcn;
while (end > evcn) {
/* Remove segment [svcn : evcn). */
mi_remove_attr(NULL, mi, attr);
if (!al_remove_le(ni, le)) {
err = -EINVAL;
goto out;
}
if (evcn + 1 >= alloc) {
/* Last attribute segment. */
evcn1 = evcn + 1;
goto ins_ext;
}
if (ni_load_mi(ni, le, &mi)) {
attr = NULL;
goto out;
}
attr = mi_find_attr(mi, NULL, ATTR_DATA, NULL, 0, &le->id);
if (!attr) {
err = -EINVAL;
goto out;
}
svcn = le64_to_cpu(attr->nres.svcn);
evcn = le64_to_cpu(attr->nres.evcn);
}
if (end < svcn)
end = svcn;
err = attr_load_runs(attr, ni, run, &end);
if (err)
goto out;
evcn1 = evcn + 1;
attr->nres.svcn = cpu_to_le64(next_svcn);
err = mi_pack_runs(mi, attr, run, evcn1 - next_svcn);
if (err)
goto out;
le->vcn = cpu_to_le64(next_svcn);
ni->attr_list.dirty = true;
mi->dirty = true;
next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
ins_ext:
if (evcn1 > next_svcn) {
err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run,
next_svcn, evcn1 - next_svcn,
attr_b->flags, &attr, &mi, NULL);
if (err)
goto out;
}
ok:
run_truncate_around(run, vcn);
out:
if (err && step > 1) {
/* Too complex to restore. */
_ntfs_bad_inode(&ni->vfs_inode);
}
up_write(&ni->file.run_lock);
ni_unlock(ni);
return err;
undo1:
/* Undo step1. */
attr_b->nres.total_size = cpu_to_le64(total_size0);
inode_set_bytes(&ni->vfs_inode, total_size0);
if (run_deallocate_ex(sbi, run, vcn, alen, NULL, false) ||
!run_add_entry(run, vcn, SPARSE_LCN, alen, false) ||
mi_pack_runs(mi, attr, run, max(end, evcn1) - svcn)) {
_ntfs_bad_inode(&ni->vfs_inode);
}
goto out;
}
int attr_data_read_resident(struct ntfs_inode *ni, struct folio *folio)
{
u64 vbo;
struct ATTRIB *attr;
u32 data_size;
size_t len;
attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, NULL);
if (!attr)
return -EINVAL;
if (attr->non_res)
return E_NTFS_NONRESIDENT;
vbo = folio->index << PAGE_SHIFT;
data_size = le32_to_cpu(attr->res.data_size);
if (vbo > data_size)
len = 0;
else
len = min(data_size - vbo, folio_size(folio));
folio_fill_tail(folio, 0, resident_data(attr) + vbo, len);
folio_mark_uptodate(folio);
return 0;
}
int attr_data_write_resident(struct ntfs_inode *ni, struct folio *folio)
{
u64 vbo;
struct mft_inode *mi;
struct ATTRIB *attr;
u32 data_size;
attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, &mi);
if (!attr)
return -EINVAL;
if (attr->non_res) {
/* Return special error code to check this case. */
return E_NTFS_NONRESIDENT;
}
vbo = folio->index << PAGE_SHIFT;
data_size = le32_to_cpu(attr->res.data_size);
if (vbo < data_size) {
char *data = resident_data(attr);
size_t len = min(data_size - vbo, folio_size(folio));
memcpy_from_folio(data + vbo, folio, 0, len);
mi->dirty = true;
}
ni->i_valid = data_size;
return 0;
}
/*
* attr_load_runs_vcn - Load runs with VCN.
*/
int attr_load_runs_vcn(struct ntfs_inode *ni, enum ATTR_TYPE type,
const __le16 *name, u8 name_len, struct runs_tree *run,
CLST vcn)
{
struct ATTRIB *attr;
int err;
CLST svcn, evcn;
u16 ro;
if (!ni) {
/* Is record corrupted? */
return -ENOENT;
}
attr = ni_find_attr(ni, NULL, NULL, type, name, name_len, &vcn, NULL);
if (!attr) {
/* Is record corrupted? */
return -ENOENT;
}
svcn = le64_to_cpu(attr->nres.svcn);
evcn = le64_to_cpu(attr->nres.evcn);
if (evcn < vcn || vcn < svcn) {
/* Is record corrupted? */
return -EINVAL;
}
ro = le16_to_cpu(attr->nres.run_off);
if (ro > le32_to_cpu(attr->size))
return -EINVAL;
err = run_unpack_ex(run, ni->mi.sbi, ni->mi.rno, svcn, evcn, svcn,
Add2Ptr(attr, ro), le32_to_cpu(attr->size) - ro);
if (err < 0)
return err;
return 0;
}
/*
* attr_load_runs_range - Load runs for given range [from to).
*/
int attr_load_runs_range(struct ntfs_inode *ni, enum ATTR_TYPE type,
const __le16 *name, u8 name_len, struct runs_tree *run,
u64 from, u64 to)
{
struct ntfs_sb_info *sbi = ni->mi.sbi;
u8 cluster_bits = sbi->cluster_bits;
CLST vcn;
CLST vcn_last = (to - 1) >> cluster_bits;
CLST lcn, clen;
int err;
for (vcn = from >> cluster_bits; vcn <= vcn_last; vcn += clen) {
if (!run_lookup_entry(run, vcn, &lcn, &clen, NULL)) {
err = attr_load_runs_vcn(ni, type, name, name_len, run,
vcn);
if (err)
return err;
clen = 0; /* Next run_lookup_entry(vcn) must be success. */
}
}
return 0;
}
#ifdef CONFIG_NTFS3_LZX_XPRESS
/*
* attr_wof_frame_info
*
* Read header of Xpress/LZX file to get info about frame.
*/
int attr_wof_frame_info(struct ntfs_inode *ni, struct ATTRIB *attr,
struct runs_tree *run, u64 frame, u64 frames,
u8 frame_bits, u32 *ondisk_size, u64 *vbo_data)
{
struct ntfs_sb_info *sbi = ni->mi.sbi;
u64 vbo[2], off[2], wof_size;
u32 voff;
u8 bytes_per_off;
char *addr;
struct folio *folio;
int i, err;
__le32 *off32;
__le64 *off64;
if (ni->vfs_inode.i_size < 0x100000000ull) {
/* File starts with array of 32 bit offsets. */
bytes_per_off = sizeof(__le32);
vbo[1] = frame << 2;
*vbo_data = frames << 2;
} else {
/* File starts with array of 64 bit offsets. */
bytes_per_off = sizeof(__le64);
vbo[1] = frame << 3;
*vbo_data = frames << 3;
}
/*
* Read 4/8 bytes at [vbo - 4(8)] == offset where compressed frame starts.
* Read 4/8 bytes at [vbo] == offset where compressed frame ends.
*/
if (!attr->non_res) {
if (vbo[1] + bytes_per_off > le32_to_cpu(attr->res.data_size)) {
ntfs_inode_err(&ni->vfs_inode, "is corrupted");
return -EINVAL;
}
addr = resident_data(attr);
if (bytes_per_off == sizeof(__le32)) {
off32 = Add2Ptr(addr, vbo[1]);
off[0] = vbo[1] ? le32_to_cpu(off32[-1]) : 0;
off[1] = le32_to_cpu(off32[0]);
} else {
off64 = Add2Ptr(addr, vbo[1]);
off[0] = vbo[1] ? le64_to_cpu(off64[-1]) : 0;
off[1] = le64_to_cpu(off64[0]);
}
*vbo_data += off[0];
*ondisk_size = off[1] - off[0];
return 0;
}
wof_size = le64_to_cpu(attr->nres.data_size);
down_write(&ni->file.run_lock);
folio = ni->file.offs_folio;
if (!folio) {
folio = folio_alloc(GFP_KERNEL, 0);
if (!folio) {
err = -ENOMEM;
goto out;
}
folio->index = -1;
ni->file.offs_folio = folio;
}
folio_lock(folio);
addr = folio_address(folio);
if (vbo[1]) {
voff = vbo[1] & (PAGE_SIZE - 1);
vbo[0] = vbo[1] - bytes_per_off;
i = 0;
} else {
voff = 0;
vbo[0] = 0;
off[0] = 0;
i = 1;
}
do {
pgoff_t index = vbo[i] >> PAGE_SHIFT;
if (index != folio->index) {
struct page *page = &folio->page;
u64 from = vbo[i] & ~(u64)(PAGE_SIZE - 1);
u64 to = min(from + PAGE_SIZE, wof_size);
err = attr_load_runs_range(ni, ATTR_DATA, WOF_NAME,
ARRAY_SIZE(WOF_NAME), run,
from, to);
if (err)
goto out1;
err = ntfs_bio_pages(sbi, run, &page, 1, from,
to - from, REQ_OP_READ);
if (err) {
folio->index = -1;
goto out1;
}
folio->index = index;
}
if (i) {
if (bytes_per_off == sizeof(__le32)) {
off32 = Add2Ptr(addr, voff);
off[1] = le32_to_cpu(*off32);
} else {
off64 = Add2Ptr(addr, voff);
off[1] = le64_to_cpu(*off64);
}
} else if (!voff) {
if (bytes_per_off == sizeof(__le32)) {
off32 = Add2Ptr(addr, PAGE_SIZE - sizeof(u32));
off[0] = le32_to_cpu(*off32);
} else {
off64 = Add2Ptr(addr, PAGE_SIZE - sizeof(u64));
off[0] = le64_to_cpu(*off64);
}
} else {
/* Two values in one page. */
if (bytes_per_off == sizeof(__le32)) {
off32 = Add2Ptr(addr, voff);
off[0] = le32_to_cpu(off32[-1]);
off[1] = le32_to_cpu(off32[0]);
} else {
off64 = Add2Ptr(addr, voff);
off[0] = le64_to_cpu(off64[-1]);
off[1] = le64_to_cpu(off64[0]);
}
break;
}
} while (++i < 2);
*vbo_data += off[0];
*ondisk_size = off[1] - off[0];
out1:
folio_unlock(folio);
out:
up_write(&ni->file.run_lock);
return err;
}
#endif
/*
* attr_is_frame_compressed - Used to detect compressed frame.
*
* attr - base (primary) attribute segment.
* Only base segments contains valid 'attr->nres.c_unit'
*/
int attr_is_frame_compressed(struct ntfs_inode *ni, struct ATTRIB *attr,
CLST frame, CLST *clst_data)
{
int err;
u32 clst_frame;
CLST clen, lcn, vcn, alen, slen, vcn_next;
size_t idx;
struct runs_tree *run;
*clst_data = 0;
if (!is_attr_compressed(attr))
return 0;
if (!attr->non_res)
return 0;
clst_frame = 1u << attr->nres.c_unit;
vcn = frame * clst_frame;
run = &ni->file.run;
if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) {
err = attr_load_runs_vcn(ni, attr->type, attr_name(attr),
attr->name_len, run, vcn);
if (err)
return err;
if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx))
return -EINVAL;
}
if (lcn == SPARSE_LCN) {
/* Sparsed frame. */
return 0;
}
if (clen >= clst_frame) {
/*
* The frame is not compressed 'cause
* it does not contain any sparse clusters.
*/
*clst_data = clst_frame;
return 0;
}
alen = bytes_to_cluster(ni->mi.sbi, le64_to_cpu(attr->nres.alloc_size));
slen = 0;
*clst_data = clen;
/*
* The frame is compressed if *clst_data + slen >= clst_frame.
* Check next fragments.
*/
while ((vcn += clen) < alen) {
vcn_next = vcn;
if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) ||
vcn_next != vcn) {
err = attr_load_runs_vcn(ni, attr->type,
attr_name(attr),
attr->name_len, run, vcn_next);
if (err)
return err;
vcn = vcn_next;
if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx))
return -EINVAL;
}
if (lcn == SPARSE_LCN) {
slen += clen;
} else {
if (slen) {
/*
* Data_clusters + sparse_clusters =
* not enough for frame.
*/
return -EINVAL;
}
*clst_data += clen;
}
if (*clst_data + slen >= clst_frame) {
if (!slen) {
/*
* There is no sparsed clusters in this frame
* so it is not compressed.
*/
*clst_data = clst_frame;
} else {
/* Frame is compressed. */
}
break;
}
}
return 0;
}
/*
* attr_allocate_frame - Allocate/free clusters for @frame.
*
* Assumed: down_write(&ni->file.run_lock);
*/
int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size,
u64 new_valid)
{
int err = 0;
struct runs_tree *run = &ni->file.run;
struct ntfs_sb_info *sbi = ni->mi.sbi;
struct ATTRIB *attr = NULL, *attr_b;
struct ATTR_LIST_ENTRY *le, *le_b;
struct mft_inode *mi, *mi_b;
CLST svcn, evcn1, next_svcn, len;
CLST vcn, end, clst_data;
u64 total_size, valid_size, data_size;
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b);
if (!attr_b)
return -ENOENT;
if (!is_attr_ext(attr_b))
return -EINVAL;
vcn = frame << NTFS_LZNT_CUNIT;
total_size = le64_to_cpu(attr_b->nres.total_size);
svcn = le64_to_cpu(attr_b->nres.svcn);
evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
data_size = le64_to_cpu(attr_b->nres.data_size);
if (svcn <= vcn && vcn < evcn1) {
attr = attr_b;
le = le_b;
mi = mi_b;
} else if (!le_b) {
err = -EINVAL;
goto out;
} else {
le = le_b;
attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
&mi);
if (!attr) {
err = -EINVAL;
goto out;
}
svcn = le64_to_cpu(attr->nres.svcn);
evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
}
err = attr_load_runs(attr, ni, run, NULL);
if (err)
goto out;
err = attr_is_frame_compressed(ni, attr_b, frame, &clst_data);
if (err)
goto out;
total_size -= (u64)clst_data << sbi->cluster_bits;
len = bytes_to_cluster(sbi, compr_size);
if (len == clst_data)
goto out;
if (len < clst_data) {
err = run_deallocate_ex(sbi, run, vcn + len, clst_data - len,
NULL, true);
if (err)
goto out;
if (!run_add_entry(run, vcn + len, SPARSE_LCN, clst_data - len,
false)) {
err = -ENOMEM;
goto out;
}
end = vcn + clst_data;
/* Run contains updated range [vcn + len : end). */
} else {
CLST alen, hint = 0;
/* Get the last LCN to allocate from. */
if (vcn + clst_data &&
!run_lookup_entry(run, vcn + clst_data - 1, &hint, NULL,
NULL)) {
hint = -1;
}
err = attr_allocate_clusters(sbi, run, vcn + clst_data,
hint + 1, len - clst_data, NULL,
ALLOCATE_DEF, &alen, 0, NULL,
NULL);
if (err)
goto out;
end = vcn + len;
/* Run contains updated range [vcn + clst_data : end). */
}
total_size += (u64)len << sbi->cluster_bits;
repack:
err = mi_pack_runs(mi, attr, run, max(end, evcn1) - svcn);
if (err)
goto out;
attr_b->nres.total_size = cpu_to_le64(total_size);
inode_set_bytes(&ni->vfs_inode, total_size);
ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
mi_b->dirty = true;
mark_inode_dirty(&ni->vfs_inode);
/* Stored [vcn : next_svcn) from [vcn : end). */
next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
if (end <= evcn1) {
if (next_svcn == evcn1) {
/* Normal way. Update attribute and exit. */
goto ok;
}
/* Add new segment [next_svcn : evcn1 - next_svcn). */
if (!ni->attr_list.size) {
err = ni_create_attr_list(ni);
if (err)
goto out;
/* Layout of records is changed. */
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL,
0, NULL, &mi_b);
if (!attr_b) {
err = -ENOENT;
goto out;
}
attr = attr_b;
le = le_b;
mi = mi_b;
goto repack;
}
}
svcn = evcn1;
/* Estimate next attribute. */
attr = ni_find_attr(ni, attr, &le, ATTR_DATA, NULL, 0, &svcn, &mi);
if (attr) {
CLST alloc = bytes_to_cluster(
sbi, le64_to_cpu(attr_b->nres.alloc_size));
CLST evcn = le64_to_cpu(attr->nres.evcn);
if (end < next_svcn)
end = next_svcn;
while (end > evcn) {
/* Remove segment [svcn : evcn). */
mi_remove_attr(NULL, mi, attr);
if (!al_remove_le(ni, le)) {
err = -EINVAL;
goto out;
}
if (evcn + 1 >= alloc) {
/* Last attribute segment. */
evcn1 = evcn + 1;
goto ins_ext;
}
if (ni_load_mi(ni, le, &mi)) {
attr = NULL;
goto out;
}
attr = mi_find_attr(mi, NULL, ATTR_DATA, NULL, 0,
&le->id);
if (!attr) {
err = -EINVAL;
goto out;
}
svcn = le64_to_cpu(attr->nres.svcn);
evcn = le64_to_cpu(attr->nres.evcn);
}
if (end < svcn)
end = svcn;
err = attr_load_runs(attr, ni, run, &end);
if (err)
goto out;
evcn1 = evcn + 1;
attr->nres.svcn = cpu_to_le64(next_svcn);
err = mi_pack_runs(mi, attr, run, evcn1 - next_svcn);
if (err)
goto out;
le->vcn = cpu_to_le64(next_svcn);
ni->attr_list.dirty = true;
mi->dirty = true;
next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
}
ins_ext:
if (evcn1 > next_svcn) {
err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run,
next_svcn, evcn1 - next_svcn,
attr_b->flags, &attr, &mi, NULL);
if (err)
goto out;
}
ok:
run_truncate_around(run, vcn);
out:
if (attr_b) {
if (new_valid > data_size)
new_valid = data_size;
valid_size = le64_to_cpu(attr_b->nres.valid_size);
if (new_valid != valid_size) {
attr_b->nres.valid_size = cpu_to_le64(valid_size);
mi_b->dirty = true;
}
}
return err;
}
/*
* attr_collapse_range - Collapse range in file.
*/
int attr_collapse_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)
{
int err = 0;
struct runs_tree *run = &ni->file.run;
struct ntfs_sb_info *sbi = ni->mi.sbi;
struct ATTRIB *attr = NULL, *attr_b;
struct ATTR_LIST_ENTRY *le, *le_b;
struct mft_inode *mi, *mi_b;
CLST svcn, evcn1, len, dealloc, alen;
CLST vcn, end;
u64 valid_size, data_size, alloc_size, total_size;
u32 mask;
__le16 a_flags;
if (!bytes)
return 0;
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b);
if (!attr_b)
return -ENOENT;
if (!attr_b->non_res) {
/* Attribute is resident. Nothing to do? */
return 0;
}
data_size = le64_to_cpu(attr_b->nres.data_size);
alloc_size = le64_to_cpu(attr_b->nres.alloc_size);
a_flags = attr_b->flags;
if (is_attr_ext(attr_b)) {
total_size = le64_to_cpu(attr_b->nres.total_size);
mask = (sbi->cluster_size << attr_b->nres.c_unit) - 1;
} else {
total_size = alloc_size;
mask = sbi->cluster_mask;
}
if ((vbo & mask) || (bytes & mask)) {
/* Allow to collapse only cluster aligned ranges. */
return -EINVAL;
}
if (vbo > data_size)
return -EINVAL;
down_write(&ni->file.run_lock);
if (vbo + bytes >= data_size) {
u64 new_valid = min(ni->i_valid, vbo);
/* Simple truncate file at 'vbo'. */
truncate_setsize(&ni->vfs_inode, vbo);
err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, vbo,
&new_valid, true, NULL);
if (!err && new_valid < ni->i_valid)
ni->i_valid = new_valid;
goto out;
}
/*
* Enumerate all attribute segments and collapse.
*/
alen = alloc_size >> sbi->cluster_bits;
vcn = vbo >> sbi->cluster_bits;
len = bytes >> sbi->cluster_bits;
end = vcn + len;
dealloc = 0;
svcn = le64_to_cpu(attr_b->nres.svcn);
evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
if (svcn <= vcn && vcn < evcn1) {
attr = attr_b;
le = le_b;
mi = mi_b;
} else if (!le_b) {
err = -EINVAL;
goto out;
} else {
le = le_b;
attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
&mi);
if (!attr) {
err = -EINVAL;
goto out;
}
svcn = le64_to_cpu(attr->nres.svcn);
evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
}
for (;;) {
if (svcn >= end) {
/* Shift VCN- */
attr->nres.svcn = cpu_to_le64(svcn - len);
attr->nres.evcn = cpu_to_le64(evcn1 - 1 - len);
if (le) {
le->vcn = attr->nres.svcn;
ni->attr_list.dirty = true;
}
mi->dirty = true;
} else if (svcn < vcn || end < evcn1) {
CLST vcn1, eat, next_svcn;
/* Collapse a part of this attribute segment. */
err = attr_load_runs(attr, ni, run, &svcn);
if (err)
goto out;
vcn1 = max(vcn, svcn);
eat = min(end, evcn1) - vcn1;
err = run_deallocate_ex(sbi, run, vcn1, eat, &dealloc,
true);
if (err)
goto out;
if (!run_collapse_range(run, vcn1, eat)) {
err = -ENOMEM;
goto out;
}
if (svcn >= vcn) {
/* Shift VCN */
attr->nres.svcn = cpu_to_le64(vcn);
if (le) {
le->vcn = attr->nres.svcn;
ni->attr_list.dirty = true;
}
}
err = mi_pack_runs(mi, attr, run, evcn1 - svcn - eat);
if (err)
goto out;
next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
if (next_svcn + eat < evcn1) {
err = ni_insert_nonresident(
ni, ATTR_DATA, NULL, 0, run, next_svcn,
evcn1 - eat - next_svcn, a_flags, &attr,
&mi, &le);
if (err)
goto out;
/* Layout of records maybe changed. */
attr_b = NULL;
}
/* Free all allocated memory. */
run_truncate(run, 0);
} else {
u16 le_sz;
u16 roff = le16_to_cpu(attr->nres.run_off);
if (roff > le32_to_cpu(attr->size)) {
err = -EINVAL;
goto out;
}
run_unpack_ex(RUN_DEALLOCATE, sbi, ni->mi.rno, svcn,
evcn1 - 1, svcn, Add2Ptr(attr, roff),
le32_to_cpu(attr->size) - roff);
/* Delete this attribute segment. */
mi_remove_attr(NULL, mi, attr);
if (!le)
break;
le_sz = le16_to_cpu(le->size);
if (!al_remove_le(ni, le)) {
err = -EINVAL;
goto out;
}
if (evcn1 >= alen)
break;
if (!svcn) {
/* Load next record that contains this attribute. */
if (ni_load_mi(ni, le, &mi)) {
err = -EINVAL;
goto out;
}
/* Look for required attribute. */
attr = mi_find_attr(mi, NULL, ATTR_DATA, NULL,
0, &le->id);
if (!attr) {
err = -EINVAL;
goto out;
}
goto next_attr;
}
le = (struct ATTR_LIST_ENTRY *)((u8 *)le - le_sz);
}
if (evcn1 >= alen)
break;
attr = ni_enum_attr_ex(ni, attr, &le, &mi);
if (!attr) {
err = -EINVAL;
goto out;
}
next_attr:
svcn = le64_to_cpu(attr->nres.svcn);
evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
}
if (!attr_b) {
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL,
&mi_b);
if (!attr_b) {
err = -ENOENT;
goto out;
}
}
data_size -= bytes;
valid_size = ni->i_valid;
if (vbo + bytes <= valid_size)
valid_size -= bytes;
else if (vbo < valid_size)
valid_size = vbo;
attr_b->nres.alloc_size = cpu_to_le64(alloc_size - bytes);
attr_b->nres.data_size = cpu_to_le64(data_size);
attr_b->nres.valid_size = cpu_to_le64(min(valid_size, data_size));
total_size -= (u64)dealloc << sbi->cluster_bits;
if (is_attr_ext(attr_b))
attr_b->nres.total_size = cpu_to_le64(total_size);
mi_b->dirty = true;
/* Update inode size. */
ni->i_valid = valid_size;
i_size_write(&ni->vfs_inode, data_size);
inode_set_bytes(&ni->vfs_inode, total_size);
ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
mark_inode_dirty(&ni->vfs_inode);
out:
up_write(&ni->file.run_lock);
if (err)
_ntfs_bad_inode(&ni->vfs_inode);
return err;
}
/*
* attr_punch_hole
*
* Not for normal files.
*/
int attr_punch_hole(struct ntfs_inode *ni, u64 vbo, u64 bytes, u32 *frame_size)
{
int err = 0;
struct runs_tree *run = &ni->file.run;
struct ntfs_sb_info *sbi = ni->mi.sbi;
struct ATTRIB *attr = NULL, *attr_b;
struct ATTR_LIST_ENTRY *le, *le_b;
struct mft_inode *mi, *mi_b;
CLST svcn, evcn1, vcn, len, end, alen, hole, next_svcn;
u64 total_size, alloc_size;
u32 mask;
__le16 a_flags;
struct runs_tree run2;
if (!bytes)
return 0;
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b);
if (!attr_b)
return -ENOENT;
if (!attr_b->non_res) {
u32 data_size = le32_to_cpu(attr_b->res.data_size);
u32 from, to;
if (vbo > data_size)
return 0;
from = vbo;
to = min_t(u64, vbo + bytes, data_size);
memset(Add2Ptr(resident_data(attr_b), from), 0, to - from);
return 0;
}
if (!is_attr_ext(attr_b))
return -EOPNOTSUPP;
alloc_size = le64_to_cpu(attr_b->nres.alloc_size);
total_size = le64_to_cpu(attr_b->nres.total_size);
if (vbo >= alloc_size) {
/* NOTE: It is allowed. */
return 0;
}
mask = (sbi->cluster_size << attr_b->nres.c_unit) - 1;
bytes += vbo;
if (bytes > alloc_size)
bytes = alloc_size;
bytes -= vbo;
if ((vbo & mask) || (bytes & mask)) {
/* We have to zero a range(s). */
if (frame_size == NULL) {
/* Caller insists range is aligned. */
return -EINVAL;
}
*frame_size = mask + 1;
return E_NTFS_NOTALIGNED;
}
down_write(&ni->file.run_lock);
run_init(&run2);
run_truncate(run, 0);
/*
* Enumerate all attribute segments and punch hole where necessary.
*/
alen = alloc_size >> sbi->cluster_bits;
vcn = vbo >> sbi->cluster_bits;
len = bytes >> sbi->cluster_bits;
end = vcn + len;
hole = 0;
svcn = le64_to_cpu(attr_b->nres.svcn);
evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
a_flags = attr_b->flags;
if (svcn <= vcn && vcn < evcn1) {
attr = attr_b;
le = le_b;
mi = mi_b;
} else if (!le_b) {
err = -EINVAL;
goto bad_inode;
} else {
le = le_b;
attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
&mi);
if (!attr) {
err = -EINVAL;
goto bad_inode;
}
svcn = le64_to_cpu(attr->nres.svcn);
evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
}
while (svcn < end) {
CLST vcn1, zero, hole2 = hole;
err = attr_load_runs(attr, ni, run, &svcn);
if (err)
goto done;
vcn1 = max(vcn, svcn);
zero = min(end, evcn1) - vcn1;
/*
* Check range [vcn1 + zero).
* Calculate how many clusters there are.
* Don't do any destructive actions.
*/
err = run_deallocate_ex(NULL, run, vcn1, zero, &hole2, false);
if (err)
goto done;
/* Check if required range is already hole. */
if (hole2 == hole)
goto next_attr;
/* Make a clone of run to undo. */
err = run_clone(run, &run2);
if (err)
goto done;
/* Make a hole range (sparse) [vcn1 + zero). */
if (!run_add_entry(run, vcn1, SPARSE_LCN, zero, false)) {
err = -ENOMEM;
goto done;
}
/* Update run in attribute segment. */
err = mi_pack_runs(mi, attr, run, evcn1 - svcn);
if (err)
goto done;
next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
if (next_svcn < evcn1) {
/* Insert new attribute segment. */
err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run,
next_svcn,
evcn1 - next_svcn, a_flags,
&attr, &mi, &le);
if (err)
goto undo_punch;
/* Layout of records maybe changed. */
attr_b = NULL;
}
/* Real deallocate. Should not fail. */
run_deallocate_ex(sbi, &run2, vcn1, zero, &hole, true);
next_attr:
/* Free all allocated memory. */
run_truncate(run, 0);
if (evcn1 >= alen)
break;
/* Get next attribute segment. */
attr = ni_enum_attr_ex(ni, attr, &le, &mi);
if (!attr) {
err = -EINVAL;
goto bad_inode;
}
svcn = le64_to_cpu(attr->nres.svcn);
evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
}
done:
if (!hole)
goto out;
if (!attr_b) {
attr_b = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL,
&mi_b);
if (!attr_b) {
err = -EINVAL;
goto bad_inode;
}
}
total_size -= (u64)hole << sbi->cluster_bits;
attr_b->nres.total_size = cpu_to_le64(total_size);
mi_b->dirty = true;
/* Update inode size. */
inode_set_bytes(&ni->vfs_inode, total_size);
ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
mark_inode_dirty(&ni->vfs_inode);
out:
run_close(&run2);
up_write(&ni->file.run_lock);
return err;
bad_inode:
_ntfs_bad_inode(&ni->vfs_inode);
goto out;
undo_punch:
/*
* Restore packed runs.
* 'mi_pack_runs' should not fail, cause we restore original.
*/
if (mi_pack_runs(mi, attr, &run2, evcn1 - svcn))
goto bad_inode;
goto done;
}
/*
* attr_insert_range - Insert range (hole) in file.
* Not for normal files.
*/
int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)
{
int err = 0;
struct runs_tree *run = &ni->file.run;
struct ntfs_sb_info *sbi = ni->mi.sbi;
struct ATTRIB *attr = NULL, *attr_b;
struct ATTR_LIST_ENTRY *le, *le_b;
struct mft_inode *mi, *mi_b;
CLST vcn, svcn, evcn1, len, next_svcn;
u64 data_size, alloc_size;
u32 mask;
__le16 a_flags;
if (!bytes)
return 0;
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b);
if (!attr_b)
return -ENOENT;
if (!is_attr_ext(attr_b)) {
/* It was checked above. See fallocate. */
return -EOPNOTSUPP;
}
if (!attr_b->non_res) {
data_size = le32_to_cpu(attr_b->res.data_size);
alloc_size = data_size;
mask = sbi->cluster_mask; /* cluster_size - 1 */
} else {
data_size = le64_to_cpu(attr_b->nres.data_size);
alloc_size = le64_to_cpu(attr_b->nres.alloc_size);
mask = (sbi->cluster_size << attr_b->nres.c_unit) - 1;
}
if (vbo >= data_size) {
/*
* Insert range after the file size is not allowed.
* If the offset is equal to or greater than the end of
* file, an error is returned. For such operations (i.e., inserting
* a hole at the end of file), ftruncate(2) should be used.
*/
return -EINVAL;
}
if ((vbo & mask) || (bytes & mask)) {
/* Allow to insert only frame aligned ranges. */
return -EINVAL;
}
/*
* valid_size <= data_size <= alloc_size
* Check alloc_size for maximum possible.
*/
if (bytes > sbi->maxbytes_sparse - alloc_size)
return -EFBIG;
vcn = vbo >> sbi->cluster_bits;
len = bytes >> sbi->cluster_bits;
down_write(&ni->file.run_lock);
if (!attr_b->non_res) {
err = attr_set_size(ni, ATTR_DATA, NULL, 0, run,
data_size + bytes, NULL, false, NULL);
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL,
&mi_b);
if (!attr_b) {
err = -EINVAL;
goto bad_inode;
}
if (err)
goto out;
if (!attr_b->non_res) {
/* Still resident. */
char *data = Add2Ptr(attr_b,
le16_to_cpu(attr_b->res.data_off));
memmove(data + bytes, data, bytes);
memset(data, 0, bytes);
goto done;
}
/* Resident files becomes nonresident. */
data_size = le64_to_cpu(attr_b->nres.data_size);
alloc_size = le64_to_cpu(attr_b->nres.alloc_size);
}
/*
* Enumerate all attribute segments and shift start vcn.
*/
a_flags = attr_b->flags;
svcn = le64_to_cpu(attr_b->nres.svcn);
evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
if (svcn <= vcn && vcn < evcn1) {
attr = attr_b;
le = le_b;
mi = mi_b;
} else if (!le_b) {
err = -EINVAL;
goto bad_inode;
} else {
le = le_b;
attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
&mi);
if (!attr) {
err = -EINVAL;
goto bad_inode;
}
svcn = le64_to_cpu(attr->nres.svcn);
evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
}
run_truncate(run, 0); /* clear cached values. */
err = attr_load_runs(attr, ni, run, NULL);
if (err)
goto out;
if (!run_insert_range(run, vcn, len)) {
err = -ENOMEM;
goto out;
}
/* Try to pack in current record as much as possible. */
err = mi_pack_runs(mi, attr, run, evcn1 + len - svcn);
if (err)
goto out;
next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
while ((attr = ni_enum_attr_ex(ni, attr, &le, &mi)) &&
attr->type == ATTR_DATA && !attr->name_len) {
le64_add_cpu(&attr->nres.svcn, len);
le64_add_cpu(&attr->nres.evcn, len);
if (le) {
le->vcn = attr->nres.svcn;
ni->attr_list.dirty = true;
}
mi->dirty = true;
}
if (next_svcn < evcn1 + len) {
err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run,
next_svcn, evcn1 + len - next_svcn,
a_flags, NULL, NULL, NULL);
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL,
&mi_b);
if (!attr_b) {
err = -EINVAL;
goto bad_inode;
}
if (err) {
/* ni_insert_nonresident failed. Try to undo. */
goto undo_insert_range;
}
}
/*
* Update primary attribute segment.
*/
if (vbo <= ni->i_valid)
ni->i_valid += bytes;
attr_b->nres.data_size = cpu_to_le64(data_size + bytes);
attr_b->nres.alloc_size = cpu_to_le64(alloc_size + bytes);
/* ni->valid may be not equal valid_size (temporary). */
if (ni->i_valid > data_size + bytes)
attr_b->nres.valid_size = attr_b->nres.data_size;
else
attr_b->nres.valid_size = cpu_to_le64(ni->i_valid);
mi_b->dirty = true;
done:
i_size_write(&ni->vfs_inode, ni->vfs_inode.i_size + bytes);
ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
mark_inode_dirty(&ni->vfs_inode);
out:
run_truncate(run, 0); /* clear cached values. */
up_write(&ni->file.run_lock);
return err;
bad_inode:
_ntfs_bad_inode(&ni->vfs_inode);
goto out;
undo_insert_range:
svcn = le64_to_cpu(attr_b->nres.svcn);
evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
if (svcn <= vcn && vcn < evcn1) {
attr = attr_b;
le = le_b;
mi = mi_b;
} else if (!le_b) {
goto bad_inode;
} else {
le = le_b;
attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
&mi);
if (!attr) {
goto bad_inode;
}
svcn = le64_to_cpu(attr->nres.svcn);
evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
}
if (attr_load_runs(attr, ni, run, NULL))
goto bad_inode;
if (!run_collapse_range(run, vcn, len))
goto bad_inode;
if (mi_pack_runs(mi, attr, run, evcn1 + len - svcn))
goto bad_inode;
while ((attr = ni_enum_attr_ex(ni, attr, &le, &mi)) &&
attr->type == ATTR_DATA && !attr->name_len) {
le64_sub_cpu(&attr->nres.svcn, len);
le64_sub_cpu(&attr->nres.evcn, len);
if (le) {
le->vcn = attr->nres.svcn;
ni->attr_list.dirty = true;
}
mi->dirty = true;
}
goto out;
}
/*
* attr_force_nonresident
*
* Convert default data attribute into non resident form.
*/
int attr_force_nonresident(struct ntfs_inode *ni)
{
int err;
struct ATTRIB *attr;
struct ATTR_LIST_ENTRY *le = NULL;
struct mft_inode *mi;
attr = ni_find_attr(ni, NULL, &le, ATTR_DATA, NULL, 0, NULL, &mi);
if (!attr) {
ntfs_bad_inode(&ni->vfs_inode, "no data attribute");
return -ENOENT;
}
if (attr->non_res) {
/* Already non resident. */
return 0;
}
down_write(&ni->file.run_lock);
err = attr_make_nonresident(ni, attr, le, mi,
le32_to_cpu(attr->res.data_size),
&ni->file.run, &attr, NULL);
up_write(&ni->file.run_lock);
return err;
}
/*
* Change the compression of data attribute
*/
int attr_set_compress(struct ntfs_inode *ni, bool compr)
{
struct ATTRIB *attr;
struct mft_inode *mi;
attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, &mi);
if (!attr)
return -ENOENT;
if (is_attr_compressed(attr) == !!compr) {
/* Already required compressed state. */
return 0;
}
if (attr->non_res) {
u16 run_off;
u32 run_size;
char *run;
if (attr->nres.data_size) {
/*
* There are rare cases when it possible to change
* compress state without big changes.
* TODO: Process these cases.
*/
return -EOPNOTSUPP;
}
run_off = le16_to_cpu(attr->nres.run_off);
run_size = le32_to_cpu(attr->size) - run_off;
run = Add2Ptr(attr, run_off);
if (!compr) {
/* remove field 'attr->nres.total_size'. */
memmove(run - 8, run, run_size);
run_off -= 8;
}
if (!mi_resize_attr(mi, attr, compr ? +8 : -8)) {
/*
* Ignore rare case when there are no 8 bytes in record with attr.
* TODO: split attribute.
*/
return -EOPNOTSUPP;
}
if (compr) {
/* Make a gap for 'attr->nres.total_size'. */
memmove(run + 8, run, run_size);
run_off += 8;
attr->nres.total_size = attr->nres.alloc_size;
}
attr->nres.run_off = cpu_to_le16(run_off);
}
/* Update data attribute flags. */
if (compr) {
attr->flags |= ATTR_FLAG_COMPRESSED;
attr->nres.c_unit = NTFS_LZNT_CUNIT;
} else {
attr->flags &= ~ATTR_FLAG_COMPRESSED;
attr->nres.c_unit = 0;
}
mi->dirty = true;
return 0;
}