[PATCH 3.16 098/125] ext4: update i_disksize coherently with block allocation on error path

Greg Kroah-Hartman
2014-09-03T22:45:48Z

From: Dmitry Monakhov <dmonakhov@openvz.org>

commit 6603120e96eae9a5d6228681ae55c7fdc998d1bb upstream.

In case of delalloc block i_disksize may be less than i_size. So we
have to update i_disksize each time we allocated and submitted some
blocks beyond i_disksize. We weren't doing this on the error paths,
so fix this.

testcase: xfstest generic/019

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/ext4/inode.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2194,6 +2194,7 @@ static int mpage_map_and_submit_extent(h
struct ext4_map_blocks *map = &mpd->map;
int err;
loff_t disksize;
+ int progress = 0;

mpd->io_submit.io_end->offset =
((loff_t)map->m_lblk) << inode->i_blkbits;
@@ -2210,8 +2211,11 @@ static int mpage_map_and_submit_extent(h
* is non-zero, a commit should free up blocks.
*/
if ((err == -ENOMEM) ||
- (err == -ENOSPC && ext4_count_free_clusters(sb)))
+ (err == -ENOSPC && ext4_count_free_clusters(sb))) {
+ if (progress)
+ goto update_disksize;
return err;
+ }
ext4_msg(sb, KERN_CRIT,
"Delayed block allocation failed for "
"inode %lu at logical offset %llu with"
@@ -2228,15 +2232,17 @@ static int mpage_map_and_submit_extent(h
*give_up_on_write = true;
return err;
}
+ progress = 1;
/*
* Update buffer state, submit mapped pages, and get us new
* extent to map
*/
err = mpage_map_and_submit_buffers(mpd);
if (err < 0)
- return err;
+ goto update_disksize;
} while (map->m_len);

+update_disksize:
/*
* Update on-disk size after IO is submitted. Races with
* truncate are avoided by checking i_size under i_data_sem.