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author | Wengang Wang <wen.gang.wang@oracle.com> | 2010-05-17 20:20:44 +0800 |
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committer | Joel Becker <joel.becker@oracle.com> | 2010-05-18 16:41:34 -0700 |
commit | d9ef75221a6247b758e1d7e18edb661996e4b7cf (patch) | |
tree | a1a1355da23b7448afdc851f7a211f2b3492d6e5 /fs/ocfs2/xattr.c | |
parent | d5a7df0649fa6a1e7800785d760e2c7d7a3204de (diff) | |
download | op-kernel-dev-d9ef75221a6247b758e1d7e18edb661996e4b7cf.zip op-kernel-dev-d9ef75221a6247b758e1d7e18edb661996e4b7cf.tar.gz |
ocfs2:dlm: avoid dlm->ast_lock lockres->spinlock dependency break
Currently we process a dirty lockres with the lockres->spinlock taken. While
during the process, we may need to lock on dlm->ast_lock. This breaks the
dependency of dlm->ast_lock(lock first) and lockres->spinlock(lock second).
This patch fixes the problem.
Since we can't release lockres->spinlock, we have to take dlm->ast_lock
just before taking the lockres->spinlock and release it after lockres->spinlock
is released. And use __dlm_queue_bast()/__dlm_queue_ast(), the nolock version,
in dlm_shuffle_lists(). There are no too many locks on a lockres, so there is no
performance harm.
Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs/ocfs2/xattr.c')
0 files changed, 0 insertions, 0 deletions