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attrib.c
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// 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_must_be_resident
*
* Return: True if attribute must be resident.
*/
static inline bool attr_must_be_resident(struct ntfs_sb_info *sbi,
enum ATTR_TYPE type)
{
const struct ATTR_DEF_ENTRY *de;
switch (type) {
case ATTR_STD:
case ATTR_NAME:
case ATTR_ID:
case ATTR_LABEL:
case ATTR_VOL_INFO:
case ATTR_ROOT:
case ATTR_EA_INFO:
return true;
default:
de = ntfs_query_def(sbi, type);
if (de && (de->flags & NTFS_ATTR_MUST_BE_RESIDENT))
return true;
return false;
}
}
/*
* 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)
{
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 (new_lcn && vcn == vcn0)
*new_lcn = lcn;
/* 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;
}
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, align;
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;
align = sbi->cluster_size;
if (is_attr_compressed(attr))
align <<= COMPRESSION_UNIT;
len = (rsize + align - 1) >> sbi->cluster_bits;
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);
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) {
char *kaddr;
page = grab_cache_page(ni->vfs_inode.i_mapping, 0);
if (!page) {
err = -ENOMEM;
goto out2;
}
kaddr = kmap_atomic(page);
memcpy(kaddr, data, rsize);
memset(kaddr + rsize, 0, PAGE_SIZE - rsize);
kunmap_atomic(kaddr);
flush_dcache_page(page);
SetPageUptodate(page);
set_page_dirty(page);
unlock_page(page);
put_page(page);
}
}
/* 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;
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)
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 = 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 = 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 : 0, &alen,
is_mft ? 0
: (sbi->record_size -
le32_to_cpu(rec->used) + 8) /
3 +
1,
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 = 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;
}
if (!is_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 = 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 = 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;
/* Update inode_set_bytes. */
if (((type == ATTR_DATA && !name_len) ||
(type == ATTR_ALLOC && name == I30_NAME))) {
bool dirty = false;
if (ni->vfs_inode.i_size != new_size) {
ni->vfs_inode.i_size = new_size;
dirty = true;
}
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;
}
}
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;
}
int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
CLST *len, bool *new)
{
int err = 0;
struct runs_tree *run = &ni->file.run;
struct ntfs_sb_info *sbi;
u8 cluster_bits;
struct ATTRIB *attr = NULL, *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;
u64 total_size;
u32 clst_per_frame;
bool ok;
if (new)
*new = false;
down_read(&ni->file.run_lock);
ok = run_lookup_entry(run, vcn, lcn, len, NULL);
up_read(&ni->file.run_lock);
if (ok && (*lcn != SPARSE_LCN || !new)) {
/* Normal way. */
return 0;
}
if (!clen)
clen = 1;
if (ok && clen > *len)
clen = *len;
sbi = ni->mi.sbi;
cluster_bits = sbi->cluster_bits;
ni_lock(ni);
down_write(&ni->file.run_lock);
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) {
err = -EINVAL;
goto out;
}
clst_per_frame = 1u << attr_b->nres.c_unit;
to_alloc = (clen + clst_per_frame - 1) & ~(clst_per_frame - 1);
if (vcn + to_alloc > asize)
to_alloc = asize - vcn;
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;
}
err = attr_load_runs(attr, ni, run, NULL);
if (err)
goto out;
if (!ok) {
ok = run_lookup_entry(run, vcn, lcn, len, NULL);
if (ok && (*lcn != SPARSE_LCN || !new)) {
/* Normal way. */
err = 0;
goto ok;
}
if (!ok && !new) {
*len = 0;
err = 0;
goto ok;
}
if (ok && clen > *len) {
clen = *len;
to_alloc = (clen + clst_per_frame - 1) &
~(clst_per_frame - 1);
}
}
if (!is_attr_ext(attr_b)) {
err = -EINVAL;
goto out;
}
/* Get the last LCN to allocate from. */
hint = 0;
if (vcn > evcn1) {