[PATCH 3.16 098/125] ext4: update i_disksize coherently with block allocation on error path
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2014-09-03 22:45:48
Also in:
lkml
3.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dmitry Monakhov <redacted> 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 <redacted> 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.