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| author | Yiwen Jiang <jiangyiwen@huawei.com> | 2014-06-23 22:22:09 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-24 01:47:45 +0200 |
| commit | f7a14f32e7e1e7e025d88e7b4c8e3cc99770f756 (patch) | |
| tree | 001fd6f29f90bb7a7bd8d7533b836e781bf6e11c /crypto/ccm.c | |
| parent | ocfs2/dlm: fix misuse of list_move_tail() in dlm_run_purge_list() (diff) | |
| download | linux-f7a14f32e7e1e7e025d88e7b4c8e3cc99770f756.tar.xz linux-f7a14f32e7e1e7e025d88e7b4c8e3cc99770f756.zip | |
ocfs2: fix a tiny race when running dirop_fileop_racer
When running dirop_fileop_racer we found a dead lock case.
2 nodes, say Node A and Node B, mount the same ocfs2 volume. Create
/race/16/1 in the filesystem, and let the inode number of dir 16 is less
than the inode number of dir race.
Node A Node B
mv /race/16/1 /race/
right after Node A has got the
EX mode of /race/16/, and tries to
get EX mode of /race
ls /race/16/
In this case, Node A has got the EX mode of /race/16/, and wants to get EX
mode of /race/. Node B has got the PR mode of /race/, and wants to get
the PR mode of /race/16/. Since EX and PR are mutually exclusive, dead
lock happens.
This patch fixes this case by locking in ancestor order before trying
inode number order.
Signed-off-by: Yiwen Jiang <jiangyiwen@huawei.com>
Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Joel Becker <jlbec@evilplan.org>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'crypto/ccm.c')
0 files changed, 0 insertions, 0 deletions