extractedLnx/linux-2.6.38/fs/ntfs/file.c_ntfs_prepare_pages_for_non_resident_write.c
static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
unsigned nr_pages, s64 pos, size_t bytes)
{
VCN vcn, highest_vcn = 0, cpos, cend, bh_cpos, bh_cend;
LCN lcn;
s64 bh_pos, vcn_len, end, initialized_size;
sector_t lcn_block;
struct page *page;
struct inode *vi;
ntfs_inode *ni, *base_ni = NULL;
ntfs_volume *vol;
runlist_element *rl, *rl2;
struct buffer_head *bh, *head, *wait[2], **wait_bh = wait;
ntfs_attr_search_ctx *ctx = NULL;
MFT_RECORD *m = NULL;
ATTR_RECORD *a = NULL;
unsigned long flags;
u32 attr_rec_len = 0;
unsigned blocksize, u;
int err, mp_size;
bool rl_write_locked, was_hole, is_retry;
unsigned char blocksize_bits;
struct {
u8 runlist_merged:1;
u8 mft_attr_mapped:1;
u8 mp_rebuilt:1;
u8 attr_switched:1;
} status = { 0, 0, 0, 0 };
BUG_ON(!nr_pages);
BUG_ON(!pages);
BUG_ON(!*pages);
vi = pages[0]->mapping->host;
ni = NTFS_I(vi);
vol = ni->vol;
ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, start page "
"index 0x%lx, nr_pages 0x%x, pos 0x%llx, bytes 0x%zx.",
vi->i_ino, ni->type, pages[0]->index, nr_pages,
(long long)pos, bytes);
blocksize = vol->sb->s_blocksize;
blocksize_bits = vol->sb->s_blocksize_bits;
u = 0;
do {
page = pages[u];
BUG_ON(!page);
/*
* create_empty_buffers() will create uptodate/dirty buffers if
* the page is uptodate/dirty.
*/
if (!page_has_buffers(page)) {
create_empty_buffers(page, blocksize, 0);
if (unlikely(!page_has_buffers(page)))
return -ENOMEM;
}
} while (++u < nr_pages);
rl_write_locked = false;
rl = NULL;
err = 0;
vcn = lcn = -1;
vcn_len = 0;
lcn_block = -1;
was_hole = false;
cpos = pos >> vol->cluster_size_bits;
end = pos + bytes;
cend = (end + vol->cluster_size - 1) >> vol->cluster_size_bits;
/*
* Loop over each page and for each page over each buffer. Use goto to
* reduce indentation.
*/
u = 0;
do_next_page:
page = pages[u];
bh_pos = (s64)page->index << PAGE_CACHE_SHIFT;
bh = head = page_buffers(page);
do {
VCN cdelta;
s64 bh_end;
unsigned bh_cofs;
/* Clear buffer_new on all buffers to reinitialise state. */
if (buffer_new(bh))
clear_buffer_new(bh);
bh_end = bh_pos + blocksize;
bh_cpos = bh_pos >> vol->cluster_size_bits;
bh_cofs = bh_pos & vol->cluster_size_mask;
if (buffer_mapped(bh)) {
/*
* The buffer is already mapped. If it is uptodate,
* ignore it.
*/
if (buffer_uptodate(bh))
continue;
/*
* The buffer is not uptodate. If the page is uptodate
* set the buffer uptodate and otherwise ignore it.
*/
if (PageUptodate(page)) {
set_buffer_uptodate(bh);
continue;
}
/*
* Neither the page nor the buffer are uptodate. If
* the buffer is only partially being written to, we
* need to read it in before the write, i.e. now.
*/
if ((bh_pos < pos && bh_end > pos) ||
(bh_pos < end && bh_end > end)) {
/*
* If the buffer is fully or partially within
* the initialized size, do an actual read.
* Otherwise, simply zero the buffer.
*/
read_lock_irqsave(&ni->size_lock, flags);
initialized_size = ni->initialized_size;
read_unlock_irqrestore(&ni->size_lock, flags);
if (bh_pos < initialized_size) {
ntfs_submit_bh_for_read(bh);
*wait_bh++ = bh;
} else {
zero_user(page, bh_offset(bh),
blocksize);
set_buffer_uptodate(bh);
}
}
continue;
}
/* Unmapped buffer. Need to map it. */
bh->b_bdev = vol->sb->s_bdev;
/*
* If the current buffer is in the same clusters as the map
* cache, there is no need to check the runlist again. The
* map cache is made up of @vcn, which is the first cached file
* cluster, @vcn_len which is the number of cached file
* clusters, @lcn is the device cluster corresponding to @vcn,
* and @lcn_block is the block number corresponding to @lcn.
*/
cdelta = bh_cpos - vcn;
if (likely(!cdelta || (cdelta > 0 && cdelta < vcn_len))) {
map_buffer_cached:
BUG_ON(lcn < 0);
bh->b_blocknr = lcn_block +
(cdelta << (vol->cluster_size_bits -
blocksize_bits)) +
(bh_cofs >> blocksize_bits);
set_buffer_mapped(bh);
/*
* If the page is uptodate so is the buffer. If the
* buffer is fully outside the write, we ignore it if
* it was already allocated and we mark it dirty so it
* gets written out if we allocated it. On the other
* hand, if we allocated the buffer but we are not
* marking it dirty we set buffer_new so we can do
* error recovery.
*/
if (PageUptodate(page)) {
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
if (unlikely(was_hole)) {
/* We allocated the buffer. */
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
if (bh_end <= pos || bh_pos >= end)
mark_buffer_dirty(bh);
else
set_buffer_new(bh);
}
continue;
}
/* Page is _not_ uptodate. */
if (likely(!was_hole)) {
/*
* Buffer was already allocated. If it is not
* uptodate and is only partially being written
* to, we need to read it in before the write,
* i.e. now.
*/
if (!buffer_uptodate(bh) && bh_pos < end &&
bh_end > pos &&
(bh_pos < pos ||
bh_end > end)) {
/*
* If the buffer is fully or partially
* within the initialized size, do an
* actual read. Otherwise, simply zero
* the buffer.
*/
read_lock_irqsave(&ni->size_lock,
flags);
initialized_size = ni->initialized_size;
read_unlock_irqrestore(&ni->size_lock,
flags);
if (bh_pos < initialized_size) {
ntfs_submit_bh_for_read(bh);
*wait_bh++ = bh;
} else {
zero_user(page, bh_offset(bh),
blocksize);
set_buffer_uptodate(bh);
}
}
continue;
}
/* We allocated the buffer. */
unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
/*
* If the buffer is fully outside the write, zero it,
* set it uptodate, and mark it dirty so it gets
* written out. If it is partially being written to,
* zero region surrounding the write but leave it to
* commit write to do anything else. Finally, if the
* buffer is fully being overwritten, do nothing.
*/
if (bh_end <= pos || bh_pos >= end) {
if (!buffer_uptodate(bh)) {
zero_user(page, bh_offset(bh),
blocksize);
set_buffer_uptodate(bh);
}
mark_buffer_dirty(bh);
continue;
}
set_buffer_new(bh);
if (!buffer_uptodate(bh) &&
(bh_pos < pos || bh_end > end)) {
u8 *kaddr;
unsigned pofs;
kaddr = kmap_atomic(page, KM_USER0);
if (bh_pos < pos) {
pofs = bh_pos & ~PAGE_CACHE_MASK;
memset(kaddr + pofs, 0, pos - bh_pos);
}
if (bh_end > end) {
pofs = end & ~PAGE_CACHE_MASK;
memset(kaddr + pofs, 0, bh_end - end);
}
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
}
continue;
}
/*
* Slow path: this is the first buffer in the cluster. If it
* is outside allocated size and is not uptodate, zero it and
* set it uptodate.
*/
read_lock_irqsave(&ni->size_lock, flags);
initialized_size = ni->allocated_size;
read_unlock_irqrestore(&ni->size_lock, flags);
if (bh_pos > initialized_size) {
if (PageUptodate(page)) {
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
} else if (!buffer_uptodate(bh)) {
zero_user(page, bh_offset(bh), blocksize);
set_buffer_uptodate(bh);
}
continue;
}
is_retry = false;
if (!rl) {
down_read(&ni->runlist.lock);
retry_remap:
rl = ni->runlist.rl;
}
if (likely(rl != NULL)) {
/* Seek to element containing target cluster. */
while (rl->length && rl[1].vcn <= bh_cpos)
rl++;
lcn = ntfs_rl_vcn_to_lcn(rl, bh_cpos);
if (likely(lcn >= 0)) {
/*
* Successful remap, setup the map cache and
* use that to deal with the buffer.
*/
was_hole = false;
vcn = bh_cpos;
vcn_len = rl[1].vcn - vcn;
lcn_block = lcn << (vol->cluster_size_bits -
blocksize_bits);
cdelta = 0;
/*
* If the number of remaining clusters touched
* by the write is smaller or equal to the
* number of cached clusters, unlock the
* runlist as the map cache will be used from
* now on.
*/
if (likely(vcn + vcn_len >= cend)) {
if (rl_write_locked) {
up_write(&ni->runlist.lock);
rl_write_locked = false;
} else
up_read(&ni->runlist.lock);
rl = NULL;
}
goto map_buffer_cached;
}
} else
lcn = LCN_RL_NOT_MAPPED;
/*
* If it is not a hole and not out of bounds, the runlist is
* probably unmapped so try to map it now.
*/
if (unlikely(lcn != LCN_HOLE && lcn != LCN_ENOENT)) {
if (likely(!is_retry && lcn == LCN_RL_NOT_MAPPED)) {
/* Attempt to map runlist. */
if (!rl_write_locked) {
/*
* We need the runlist locked for
* writing, so if it is locked for
* reading relock it now and retry in
* case it changed whilst we dropped
* the lock.
*/
up_read(&ni->runlist.lock);
down_write(&ni->runlist.lock);
rl_write_locked = true;
goto retry_remap;
}
err = ntfs_map_runlist_nolock(ni, bh_cpos,
NULL);
if (likely(!err)) {
is_retry = true;
goto retry_remap;
}
/*
* If @vcn is out of bounds, pretend @lcn is
* LCN_ENOENT. As long as the buffer is out
* of bounds this will work fine.
*/
if (err == -ENOENT) {
lcn = LCN_ENOENT;
err = 0;
goto rl_not_mapped_enoent;
}
} else
err = -EIO;
/* Failed to map the buffer, even after retrying. */
bh->b_blocknr = -1;
ntfs_error(vol->sb, "Failed to write to inode 0x%lx, "
"attribute type 0x%x, vcn 0x%llx, "
"vcn offset 0x%x, because its "
"location on disk could not be "
"determined%s (error code %i).",
ni->mft_no, ni->type,
(unsigned long long)bh_cpos,
(unsigned)bh_pos &
vol->cluster_size_mask,
is_retry ? " even after retrying" : "",
err);
break;
}
rl_not_mapped_enoent:
/*
* The buffer is in a hole or out of bounds. We need to fill
* the hole, unless the buffer is in a cluster which is not
* touched by the write, in which case we just leave the buffer
* unmapped. This can only happen when the cluster size is
* less than the page cache size.
*/
if (unlikely(vol->cluster_size < PAGE_CACHE_SIZE)) {
bh_cend = (bh_end + vol->cluster_size - 1) >>
vol->cluster_size_bits;
if ((bh_cend <= cpos || bh_cpos >= cend)) {
bh->b_blocknr = -1;
/*
* If the buffer is uptodate we skip it. If it
* is not but the page is uptodate, we can set
* the buffer uptodate. If the page is not
* uptodate, we can clear the buffer and set it
* uptodate. Whether this is worthwhile is
* debatable and this could be removed.
*/
if (PageUptodate(page)) {
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
} else if (!buffer_uptodate(bh)) {
zero_user(page, bh_offset(bh),
blocksize);
set_buffer_uptodate(bh);
}
continue;
}
}
/*
* Out of bounds buffer is invalid if it was not really out of
* bounds.
*/
BUG_ON(lcn != LCN_HOLE);
/*
* We need the runlist locked for writing, so if it is locked
* for reading relock it now and retry in case it changed
* whilst we dropped the lock.
*/
BUG_ON(!rl);
if (!rl_write_locked) {
up_read(&ni->runlist.lock);
down_write(&ni->runlist.lock);
rl_write_locked = true;
goto retry_remap;
}
/* Find the previous last allocated cluster. */
BUG_ON(rl->lcn != LCN_HOLE);
lcn = -1;
rl2 = rl;
while (--rl2 >= ni->runlist.rl) {
if (rl2->lcn >= 0) {
lcn = rl2->lcn + rl2->length;
break;
}
}
rl2 = ntfs_cluster_alloc(vol, bh_cpos, 1, lcn, DATA_ZONE,
false);
if (IS_ERR(rl2)) {
err = PTR_ERR(rl2);
ntfs_debug("Failed to allocate cluster, error code %i.",
err);
break;
}
lcn = rl2->lcn;
rl = ntfs_runlists_merge(ni->runlist.rl, rl2);
if (IS_ERR(rl)) {
err = PTR_ERR(rl);
if (err != -ENOMEM)
err = -EIO;
if (ntfs_cluster_free_from_rl(vol, rl2)) {
ntfs_error(vol->sb, "Failed to release "
"allocated cluster in error "
"code path. Run chkdsk to "
"recover the lost cluster.");
NVolSetErrors(vol);
}
ntfs_free(rl2);
break;
}
ni->runlist.rl = rl;
status.runlist_merged = 1;
ntfs_debug("Allocated cluster, lcn 0x%llx.",
(unsigned long long)lcn);
/* Map and lock the mft record and get the attribute record. */
if (!NInoAttr(ni))
base_ni = ni;
else
base_ni = ni->ext.base_ntfs_ino;
m = map_mft_record(base_ni);
if (IS_ERR(m)) {
err = PTR_ERR(m);
break;
}
ctx = ntfs_attr_get_search_ctx(base_ni, m);
if (unlikely(!ctx)) {
err = -ENOMEM;
unmap_mft_record(base_ni);
break;
}
status.mft_attr_mapped = 1;
err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
CASE_SENSITIVE, bh_cpos, NULL, 0, ctx);
if (unlikely(err)) {
if (err == -ENOENT)
err = -EIO;
break;
}
m = ctx->mrec;
a = ctx->attr;
/*
* Find the runlist element with which the attribute extent
* starts. Note, we cannot use the _attr_ version because we
* have mapped the mft record. That is ok because we know the
* runlist fragment must be mapped already to have ever gotten
* here, so we can just use the _rl_ version.
*/
vcn = sle64_to_cpu(a->data.non_resident.lowest_vcn);
rl2 = ntfs_rl_find_vcn_nolock(rl, vcn);
BUG_ON(!rl2);
BUG_ON(!rl2->length);
BUG_ON(rl2->lcn < LCN_HOLE);
highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
/*
* If @highest_vcn is zero, calculate the real highest_vcn
* (which can really be zero).
*/
if (!highest_vcn)
highest_vcn = (sle64_to_cpu(
a->data.non_resident.allocated_size) >>
vol->cluster_size_bits) - 1;
/*
* Determine the size of the mapping pairs array for the new
* extent, i.e. the old extent with the hole filled.
*/
mp_size = ntfs_get_size_for_mapping_pairs(vol, rl2, vcn,
highest_vcn);
if (unlikely(mp_size <= 0)) {
if (!(err = mp_size))
err = -EIO;
ntfs_debug("Failed to get size for mapping pairs "
"array, error code %i.", err);
break;
}
/*
* Resize the attribute record to fit the new mapping pairs
* array.
*/
attr_rec_len = le32_to_cpu(a->length);
err = ntfs_attr_record_resize(m, a, mp_size + le16_to_cpu(
a->data.non_resident.mapping_pairs_offset));
if (unlikely(err)) {
BUG_ON(err != -ENOSPC);
// TODO: Deal with this by using the current attribute
// and fill it with as much of the mapping pairs
// array as possible. Then loop over each attribute
// extent rewriting the mapping pairs arrays as we go
// along and if when we reach the end we have not
// enough space, try to resize the last attribute
// extent and if even that fails, add a new attribute
// extent.
// We could also try to resize at each step in the hope
// that we will not need to rewrite every single extent.
// Note, we may need to decompress some extents to fill
// the runlist as we are walking the extents...
ntfs_error(vol->sb, "Not enough space in the mft "
"record for the extended attribute "
"record. This case is not "
"implemented yet.");
err = -EOPNOTSUPP;
break ;
}
status.mp_rebuilt = 1;
/*
* Generate the mapping pairs array directly into the attribute
* record.
*/
err = ntfs_mapping_pairs_build(vol, (u8*)a + le16_to_cpu(
a->data.non_resident.mapping_pairs_offset),
mp_size, rl2, vcn, highest_vcn, NULL);
if (unlikely(err)) {
ntfs_error(vol->sb, "Cannot fill hole in inode 0x%lx, "
"attribute type 0x%x, because building "
"the mapping pairs failed with error "
"code %i.", vi->i_ino,
(unsigned)le32_to_cpu(ni->type), err);
err = -EIO;
break;
}
/* Update the highest_vcn but only if it was not set. */
if (unlikely(!a->data.non_resident.highest_vcn))
a->data.non_resident.highest_vcn =
cpu_to_sle64(highest_vcn);
/*
* If the attribute is sparse/compressed, update the compressed
* size in the ntfs_inode structure and the attribute record.
*/
if (likely(NInoSparse(ni) || NInoCompressed(ni))) {
/*
* If we are not in the first attribute extent, switch
* to it, but first ensure the changes will make it to
* disk later.
*/
if (a->data.non_resident.lowest_vcn) {
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
ntfs_attr_reinit_search_ctx(ctx);
err = ntfs_attr_lookup(ni->type, ni->name,
ni->name_len, CASE_SENSITIVE,
0, NULL, 0, ctx);
if (unlikely(err)) {
status.attr_switched = 1;
break;
}
/* @m is not used any more so do not set it. */
a = ctx->attr;
}
write_lock_irqsave(&ni->size_lock, flags);
ni->itype.compressed.size += vol->cluster_size;
a->data.non_resident.compressed_size =
cpu_to_sle64(ni->itype.compressed.size);
write_unlock_irqrestore(&ni->size_lock, flags);
}
/* Ensure the changes make it to disk. */
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
ntfs_attr_put_search_ctx(ctx);
unmap_mft_record(base_ni);
/* Successfully filled the hole. */
status.runlist_merged = 0;
status.mft_attr_mapped = 0;
status.mp_rebuilt = 0;
/* Setup the map cache and use that to deal with the buffer. */
was_hole = true;
vcn = bh_cpos;
vcn_len = 1;
lcn_block = lcn << (vol->cluster_size_bits - blocksize_bits);
cdelta = 0;
/*
* If the number of remaining clusters in the @pages is smaller
* or equal to the number of cached clusters, unlock the
* runlist as the map cache will be used from now on.
*/
if (likely(vcn + vcn_len >= cend)) {
up_write(&ni->runlist.lock);
rl_write_locked = false;
rl = NULL;
}
goto map_buffer_cached;
} while (bh_pos += blocksize, (bh = bh->b_this_page) != head);
/* If there are no errors, do the next page. */
if (likely(!err && ++u < nr_pages))
goto do_next_page;
/* If there are no errors, release the runlist lock if we took it. */
if (likely(!err)) {
if (unlikely(rl_write_locked)) {
up_write(&ni->runlist.lock);
rl_write_locked = false;
} else if (unlikely(rl))
up_read(&ni->runlist.lock);
rl = NULL;
}
/* If we issued read requests, let them complete. */
read_lock_irqsave(&ni->size_lock, flags);
initialized_size = ni->initialized_size;
read_unlock_irqrestore(&ni->size_lock, flags);
while (wait_bh > wait) {
bh = *--wait_bh;
wait_on_buffer(bh);
if (likely(buffer_uptodate(bh))) {
page = bh->b_page;
bh_pos = ((s64)page->index << PAGE_CACHE_SHIFT) +
bh_offset(bh);
/*
* If the buffer overflows the initialized size, need
* to zero the overflowing region.
*/
if (unlikely(bh_pos + blocksize > initialized_size)) {
int ofs = 0;
if (likely(bh_pos < initialized_size))
ofs = initialized_size - bh_pos;
zero_user_segment(page, bh_offset(bh) + ofs,
blocksize);
}
} else /* if (unlikely(!buffer_uptodate(bh))) */
err = -EIO;
}
if (likely(!err)) {
/* Clear buffer_new on all buffers. */
u = 0;
do {
bh = head = page_buffers(pages[u]);
do {
if (buffer_new(bh))
clear_buffer_new(bh);
} while ((bh = bh->b_this_page) != head);
} while (++u < nr_pages);
ntfs_debug("Done.");
return err;
}
if (status.attr_switched) {
/* Get back to the attribute extent we modified. */
ntfs_attr_reinit_search_ctx(ctx);
if (ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
CASE_SENSITIVE, bh_cpos, NULL, 0, ctx)) {
ntfs_error(vol->sb, "Failed to find required "
"attribute extent of attribute in "
"error code path. Run chkdsk to "
"recover.");
write_lock_irqsave(&ni->size_lock, flags);
ni->itype.compressed.size += vol->cluster_size;
write_unlock_irqrestore(&ni->size_lock, flags);
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
/*
* The only thing that is now wrong is the compressed
* size of the base attribute extent which chkdsk
* should be able to fix.
*/
NVolSetErrors(vol);
} else {
m = ctx->mrec;
a = ctx->attr;
status.attr_switched = 0;
}
}
/*
* If the runlist has been modified, need to restore it by punching a
* hole into it and we then need to deallocate the on-disk cluster as
* well. Note, we only modify the runlist if we are able to generate a
* new mapping pairs array, i.e. only when the mapped attribute extent
* is not switched.
*/
if (status.runlist_merged && !status.attr_switched) {
BUG_ON(!rl_write_locked);
/* Make the file cluster we allocated sparse in the runlist. */
if (ntfs_rl_punch_nolock(vol, &ni->runlist, bh_cpos, 1)) {
ntfs_error(vol->sb, "Failed to punch hole into "
"attribute runlist in error code "
"path. Run chkdsk to recover the "
"lost cluster.");
NVolSetErrors(vol);
} else /* if (success) */ {
status.runlist_merged = 0;
/*
* Deallocate the on-disk cluster we allocated but only
* if we succeeded in punching its vcn out of the
* runlist.
*/
down_write(&vol->lcnbmp_lock);
if (ntfs_bitmap_clear_bit(vol->lcnbmp_ino, lcn)) {
ntfs_error(vol->sb, "Failed to release "
"allocated cluster in error "
"code path. Run chkdsk to "
"recover the lost cluster.");
NVolSetErrors(vol);
}
up_write(&vol->lcnbmp_lock);
}
}
/*
* Resize the attribute record to its old size and rebuild the mapping
* pairs array. Note, we only can do this if the runlist has been
* restored to its old state which also implies that the mapped
* attribute extent is not switched.
*/
if (status.mp_rebuilt && !status.runlist_merged) {
if (ntfs_attr_record_resize(m, a, attr_rec_len)) {
ntfs_error(vol->sb, "Failed to restore attribute "
"record in error code path. Run "
"chkdsk to recover.");
NVolSetErrors(vol);
} else /* if (success) */ {
if (ntfs_mapping_pairs_build(vol, (u8*)a +
le16_to_cpu(a->data.non_resident.
mapping_pairs_offset), attr_rec_len -
le16_to_cpu(a->data.non_resident.
mapping_pairs_offset), ni->runlist.rl,
vcn, highest_vcn, NULL)) {
ntfs_error(vol->sb, "Failed to restore "
"mapping pairs array in error "
"code path. Run chkdsk to "
"recover.");
NVolSetErrors(vol);
}
flush_dcache_mft_record_page(ctx->ntfs_ino);
mark_mft_record_dirty(ctx->ntfs_ino);
}
}
/* Release the mft record and the attribute. */
if (status.mft_attr_mapped) {
ntfs_attr_put_search_ctx(ctx);
unmap_mft_record(base_ni);
}
/* Release the runlist lock. */
if (rl_write_locked)
up_write(&ni->runlist.lock);
else if (rl)
up_read(&ni->runlist.lock);
/*
* Zero out any newly allocated blocks to avoid exposing stale data.
* If BH_New is set, we know that the block was newly allocated above
* and that it has not been fully zeroed and marked dirty yet.
*/
nr_pages = u;
u = 0;
end = bh_cpos << vol->cluster_size_bits;
do {
page = pages[u];
bh = head = page_buffers(page);
do {
if (u == nr_pages &&
((s64)page->index << PAGE_CACHE_SHIFT) +
bh_offset(bh) >= end)
break;
if (!buffer_new(bh))
continue;
clear_buffer_new(bh);
if (!buffer_uptodate(bh)) {
if (PageUptodate(page))
set_buffer_uptodate(bh);
else {
zero_user(page, bh_offset(bh),
blocksize);
set_buffer_uptodate(bh);
}
}
mark_buffer_dirty(bh);
} while ((bh = bh->b_this_page) != head);
} while (++u <= nr_pages);
ntfs_error(vol->sb, "Failed. Returning error code %i.", err);
return err;
}
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