diff options
| author | Daeho Jeong <daeho.jeong@samsung.com> | 2015-10-17 22:28:21 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2015-10-17 22:28:21 -0400 |
| commit | 9c02ac97989d544c89f049e8add7149aaea01671 (patch) | |
| tree | d8f5b9c9b82dff0bca390ff899ef54f0b4a5edc8 /fs/ext4 | |
| parent | 9008a58e5dcee014f5de69d154e2620870f9224e (diff) | |
ext4: fix xfstest generic/269 double revoked buffer bug with bigalloc
When you repeatly execute xfstest generic/269 with bigalloc_1k option
enabled using the below command:
"./kvm-xfstests -c bigalloc_1k -m nodelalloc -C 1000 generic/269"
you can easily see the below bug message.
"JBD2 unexpected failure: jbd2_journal_revoke: !buffer_revoked(bh);"
This means that an already revoked buffer is erroneously revoked again
and it is caused by doing revoke for the buffer at the wrong position
in ext4_free_blocks(). We need to re-position the buffer revoke
procedure for an unspecified buffer after checking the cluster boundary
for bigalloc option. If not, some part of the cluster can be doubly
revoked.
Signed-off-by: Daeho Jeong <daeho.jeong@samsung.com>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/mballoc.c | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 6794ff47cfaf..61eaf74dca37 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -4687,22 +4687,11 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode, ext4_debug("freeing block %llu\n", block); trace_ext4_free_blocks(inode, block, count, flags); - if (flags & EXT4_FREE_BLOCKS_FORGET) { - struct buffer_head *tbh = bh; - int i; - - BUG_ON(bh && (count > 1)); + if (bh && (flags & EXT4_FREE_BLOCKS_FORGET)) { + BUG_ON(count > 1); - for (i = 0; i < count; i++) { - cond_resched(); - if (!bh) - tbh = sb_find_get_block(inode->i_sb, - block + i); - if (!tbh) - continue; - ext4_forget(handle, flags & EXT4_FREE_BLOCKS_METADATA, - inode, tbh, block + i); - } + ext4_forget(handle, flags & EXT4_FREE_BLOCKS_METADATA, + inode, bh, block); } /* @@ -4747,6 +4736,19 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode, count += sbi->s_cluster_ratio - overflow; } + if (!bh && (flags & EXT4_FREE_BLOCKS_FORGET)) { + int i; + + for (i = 0; i < count; i++) { + cond_resched(); + bh = sb_find_get_block(inode->i_sb, block + i); + if (!bh) + continue; + ext4_forget(handle, flags & EXT4_FREE_BLOCKS_METADATA, + inode, bh, block + i); + } + } + do_more: overflow = 0; ext4_get_group_no_and_offset(sb, block, &block_group, &bit); |