diff options
| author | Jaegeuk Kim | 2014-12-18 19:32:36 -0800 |
|---|---|---|
| committer | Jaegeuk Kim | 2015-01-09 17:02:25 -0800 |
| commit | dd802406e396c22dfb5aa0d16196f04d515be49e (patch) | |
| tree | dd7c8361203983936bc6ef5f6c61234a69eadfd0 /fs/mbcache.c | |
| parent | db9f7c1a9561e998d6227bcc1c19bc4c1fbbca1b (diff) | |
f2fs: avoid double lock for cp_rwsem
The __f2fs_add_link is covered by cp_rwsem all the time.
This calls init_inode_metadata, which conducts some acl operations including
memory allocation with GFP_KERNEL previously.
But, under memory pressure, f2fs_write_data_page can be called, which also
grabs cp_rwsem too.
In this case, this incurs a deadlock pointed by Chao.
Thread #1 Thread #2
down_read
down_write
down_read
-> here down_read should wait forever.
Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/mbcache.c')
0 files changed, 0 insertions, 0 deletions