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authorJaegeuk Kim <jaegeuk@kernel.org>2015-03-11 20:42:48 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2015-04-11 01:08:43 +0300
commit21cb1d99bcc77252e6426010bcc6433f75b581bb (patch)
treecb96433d02fea464b2ce630fd6afd32059d0fb49 /fs/f2fs/segment.c
parentd6d4f1cb912d9bcf988a529d0934568d4550f7b5 (diff)
downloadlinux-21cb1d99bcc77252e6426010bcc6433f75b581bb.tar.xz
f2fs: fix to cover sentry_lock for block allocation
In the following call stack, f2fs changes the bitmap for dirty segments and # of dirty sentries without grabbing sit_i->sentry_lock. This can result in mismatch on bitmap and # of dirty sentries, since if there are some direct_io operations. In allocate_data_block, - __allocate_new_segments - mutex_lock(&curseg->curseg_mutex); - s_ops->allocate_segment - new_curseg/change_curseg - reset_curseg - __set_sit_entry_type - __mark_sit_entry_dirty - set_bit(dirty_sentries_bitmap) - dirty_sentries++; Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/segment.c')
-rw-r--r--fs/f2fs/segment.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 3e80bd69d4a0..eafaf728236b 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1167,6 +1167,7 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
curseg = CURSEG_I(sbi, type);
mutex_lock(&curseg->curseg_mutex);
+ mutex_lock(&sit_i->sentry_lock);
/* direct_io'ed data is aligned to the segment for better performance */
if (direct_io && curseg->next_blkoff)
@@ -1181,7 +1182,6 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
*/
__add_sum_entry(sbi, type, sum);
- mutex_lock(&sit_i->sentry_lock);
__refresh_next_blkoff(sbi, curseg);
stat_inc_block_count(sbi, curseg);