Skip to content

Commit

Permalink
ext4: fix suboptimal seek_{data,hole} extents traversial
Browse files Browse the repository at this point in the history 
It is ridiculous practice to scan inode block by block, this technique
applicable only for old indirect files. This takes significant amount
of time for really large files. Let's reuse ext4_fiemap which already
traverse inode-tree in most optimal meaner.

TESTCASE:
ftruncate64(fd, 0);
ftruncate64(fd, 1ULL << 40);
/* lseek will spin very long time */
lseek64(fd, 0, SEEK_DATA);
lseek64(fd, 0, SEEK_HOLE);

Original report: https://lkml.org/lkml/2014/10/16/620

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
  • Loading branch information
Dmitry Monakhov authored and Theodore Ts'o committed Dec 2, 2014
1 parent d952d69 commit 14516bb
Show file tree
Hide file tree
Showing 2 changed files with 108 additions and 116 deletions.
4 changes: 2 additions & 2 deletions fs/ext4/extents.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -5166,8 +5166,8 @@ int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,

/* fallback to generic here if not in extents fmt */
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
return generic_block_fiemap(inode, fieinfo, start, len,
ext4_get_block);
return __generic_block_fiemap(inode, fieinfo, start, len,
ext4_get_block);

if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS))
return -EBADR;
Expand Down
220 changes: 106 additions & 114 deletions fs/ext4/file.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -273,24 +273,19 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
* we determine this extent as a data or a hole according to whether the
* page cache has data or not.
*/
static int ext4_find_unwritten_pgoff(struct inode *inode,
int whence,
struct ext4_map_blocks *map,
loff_t *offset)
static int ext4_find_unwritten_pgoff(struct inode *inode, int whence,
loff_t endoff, loff_t *offset)
{
struct pagevec pvec;
unsigned int blkbits;
pgoff_t index;
pgoff_t end;
loff_t endoff;
loff_t startoff;
loff_t lastoff;
int found = 0;

blkbits = inode->i_sb->s_blocksize_bits;
startoff = *offset;
lastoff = startoff;
endoff = (loff_t)(map->m_lblk + map->m_len) << blkbits;


index = startoff >> PAGE_CACHE_SHIFT;
end = endoff >> PAGE_CACHE_SHIFT;
Expand Down Expand Up @@ -408,147 +403,144 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
{
struct inode *inode = file->f_mapping->host;
struct ext4_map_blocks map;
struct extent_status es;
ext4_lblk_t start, last, end;
loff_t dataoff, isize;
int blkbits;
int ret = 0;
struct fiemap_extent_info fie;
struct fiemap_extent ext[2];
loff_t next;
int i, ret = 0;

mutex_lock(&inode->i_mutex);

isize = i_size_read(inode);
if (offset >= isize) {
if (offset >= inode->i_size) {
mutex_unlock(&inode->i_mutex);
return -ENXIO;
}

blkbits = inode->i_sb->s_blocksize_bits;
start = offset >> blkbits;
last = start;
end = isize >> blkbits;
dataoff = offset;

do {
map.m_lblk = last;
map.m_len = end - last + 1;
ret = ext4_map_blocks(NULL, inode, &map, 0);
if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
if (last != start)
dataoff = (loff_t)last << blkbits;
fie.fi_flags = 0;
fie.fi_extents_max = 2;
fie.fi_extents_start = (struct fiemap_extent __user *) &ext;
while (1) {
mm_segment_t old_fs = get_fs();

fie.fi_extents_mapped = 0;
memset(ext, 0, sizeof(*ext) * fie.fi_extents_max);

set_fs(get_ds());
ret = ext4_fiemap(inode, &fie, offset, maxsize - offset);
set_fs(old_fs);
if (ret)
break;
}

/*
* If there is a delay extent at this offset,
* it will be as a data.
*/
ext4_es_find_delayed_extent_range(inode, last, last, &es);
if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
if (last != start)
dataoff = (loff_t)last << blkbits;
/* No extents found, EOF */
if (!fie.fi_extents_mapped) {
ret = -ENXIO;
break;
}
for (i = 0; i < fie.fi_extents_mapped; i++) {
next = (loff_t)(ext[i].fe_length + ext[i].fe_logical);

/*
* If there is a unwritten extent at this offset,
* it will be as a data or a hole according to page
* cache that has data or not.
*/
if (map.m_flags & EXT4_MAP_UNWRITTEN) {
int unwritten;
unwritten = ext4_find_unwritten_pgoff(inode, SEEK_DATA,
&map, &dataoff);
if (unwritten)
break;
}
if (offset < (loff_t)ext[i].fe_logical)
offset = (loff_t)ext[i].fe_logical;
/*
* If extent is not unwritten, then it contains valid
* data, mapped or delayed.
*/
if (!(ext[i].fe_flags & FIEMAP_EXTENT_UNWRITTEN))
goto out;

last++;
dataoff = (loff_t)last << blkbits;
} while (last <= end);
/*
* If there is a unwritten extent at this offset,
* it will be as a data or a hole according to page
* cache that has data or not.
*/
if (ext4_find_unwritten_pgoff(inode, SEEK_DATA,
next, &offset))
goto out;

if (ext[i].fe_flags & FIEMAP_EXTENT_LAST) {
ret = -ENXIO;
goto out;
}
offset = next;
}
}
if (offset > inode->i_size)
offset = inode->i_size;
out:
mutex_unlock(&inode->i_mutex);
if (ret)
return ret;

if (dataoff > isize)
return -ENXIO;

return vfs_setpos(file, dataoff, maxsize);
return vfs_setpos(file, offset, maxsize);
}

/*
* ext4_seek_hole() retrieves the offset for SEEK_HOLE.
* ext4_seek_hole() retrieves the offset for SEEK_HOLE
*/
static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
{
struct inode *inode = file->f_mapping->host;
struct ext4_map_blocks map;
struct extent_status es;
ext4_lblk_t start, last, end;
loff_t holeoff, isize;
int blkbits;
int ret = 0;
struct fiemap_extent_info fie;
struct fiemap_extent ext[2];
loff_t next;
int i, ret = 0;

mutex_lock(&inode->i_mutex);

isize = i_size_read(inode);
if (offset >= isize) {
if (offset >= inode->i_size) {
mutex_unlock(&inode->i_mutex);
return -ENXIO;
}

blkbits = inode->i_sb->s_blocksize_bits;
start = offset >> blkbits;
last = start;
end = isize >> blkbits;
holeoff = offset;
fie.fi_flags = 0;
fie.fi_extents_max = 2;
fie.fi_extents_start = (struct fiemap_extent __user *)&ext;
while (1) {
mm_segment_t old_fs = get_fs();

do {
map.m_lblk = last;
map.m_len = end - last + 1;
ret = ext4_map_blocks(NULL, inode, &map, 0);
if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
last += ret;
holeoff = (loff_t)last << blkbits;
continue;
}
fie.fi_extents_mapped = 0;
memset(ext, 0, sizeof(*ext));

/*
* If there is a delay extent at this offset,
* we will skip this extent.
*/
ext4_es_find_delayed_extent_range(inode, last, last, &es);
if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
last = es.es_lblk + es.es_len;
holeoff = (loff_t)last << blkbits;
continue;
}
set_fs(get_ds());
ret = ext4_fiemap(inode, &fie, offset, maxsize - offset);
set_fs(old_fs);
if (ret)
break;

/*
* If there is a unwritten extent at this offset,
* it will be as a data or a hole according to page
* cache that has data or not.
*/
if (map.m_flags & EXT4_MAP_UNWRITTEN) {
int unwritten;
unwritten = ext4_find_unwritten_pgoff(inode, SEEK_HOLE,
&map, &holeoff);
if (!unwritten) {
last += ret;
holeoff = (loff_t)last << blkbits;
/* No extents found */
if (!fie.fi_extents_mapped)
break;

for (i = 0; i < fie.fi_extents_mapped; i++) {
next = (loff_t)(ext[i].fe_logical + ext[i].fe_length);
/*
* If extent is not unwritten, then it contains valid
* data, mapped or delayed.
*/
if (!(ext[i].fe_flags & FIEMAP_EXTENT_UNWRITTEN)) {
if (offset < (loff_t)ext[i].fe_logical)
goto out;
offset = next;
continue;
}
}

/* find a hole */
break;
} while (last <= end);
/*
* If there is a unwritten extent at this offset,
* it will be as a data or a hole according to page
* cache that has data or not.
*/
if (ext4_find_unwritten_pgoff(inode, SEEK_HOLE,
next, &offset))
goto out;

offset = next;
if (ext[i].fe_flags & FIEMAP_EXTENT_LAST)
goto out;
}
}
if (offset > inode->i_size)
offset = inode->i_size;
out:
mutex_unlock(&inode->i_mutex);
if (ret)
return ret;

if (holeoff > isize)
holeoff = isize;

return vfs_setpos(file, holeoff, maxsize);
return vfs_setpos(file, offset, maxsize);
}

/*
Expand Down

0 comments on commit 14516bb

Please sign in to comment.