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| author | Jinshan Xiong <jinshan.xiong@intel.com> | 2016-03-30 19:48:40 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-03-30 21:38:13 -0700 |
| commit | 06563b5606da7635b1fd5d121e7bd6d221e23db4 (patch) | |
| tree | 204b4a98c04f9301e1606f9bedc93fb1bdc04463 /drivers/staging/lustre/lustre/ldlm/ldlm_lib.c | |
| parent | e5c4e635c36354c0f4aa6a00b1787d15ee689528 (diff) | |
| download | op-kernel-dev-06563b5606da7635b1fd5d121e7bd6d221e23db4.zip op-kernel-dev-06563b5606da7635b1fd5d121e7bd6d221e23db4.tar.gz | |
staging/lustre/clio: cl_lock simplification
In this patch, the cl_lock cache is eliminated. cl_lock is turned
into a cacheless data container for the requirements of locks to
complete the IO. cl_lock is created before I/O starts and destroyed
when the I/O is complete.
cl_lock depends on LDLM lock to fulfill lock semantics. LDLM lock
is attached to cl_lock at OSC layer. LDLM lock is still cacheable.
Two major methods are supported for cl_lock: clo_enqueue and
clo_cancel. A cl_lock is enqueued by cl_lock_request(), which will
call clo_enqueue() methods for each layer to enqueue the lock.
At the LOV layer, if a cl_lock consists of multiple sub cl_locks,
each sub locks will be enqueued correspondingly. At OSC layer, the
lock enqueue request will tend to reuse cached LDLM lock; otherwise
a new LDLM lock will have to be requested from OST side.
cl_lock_cancel() must be called to release a cl_lock after use.
clo_cancel() method will be called for each layer to release the
resource held by this lock. At OSC layer, the reference count of LDLM
lock, which is held at clo_enqueue time, is released.
LDLM lock can only be canceled if there is no cl_lock using it.
Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-on: http://review.whamcloud.com/10858
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3259
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/lustre/lustre/ldlm/ldlm_lib.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/ldlm/ldlm_lib.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c b/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c index b497ce4..7fedbec 100644 --- a/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c +++ b/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c @@ -748,6 +748,7 @@ int ldlm_error2errno(enum ldlm_error error) switch (error) { case ELDLM_OK: + case ELDLM_LOCK_MATCHED: result = 0; break; case ELDLM_LOCK_CHANGED: |
