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ceph: fix file lock interruption

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When a lock operation is interrupted, current code sends a unlock request to
MDS to undo the lock operation. This method does not work as expected because
the unlock request can drop locks that have already been acquired.

The fix is use the newly introduced CEPH_LOCK_FCNTL_INTR/CEPH_LOCK_FLOCK_INTR
requests to interrupt blocked file lock request. These requests do not drop
locks that have alread been acquired, they only interrupt blocked file lock
request.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng
2014-10-14 10:33:35 +08:00
committed by Ilya Dryomov
parent b2776bf714
commit 9280be24dc
4 changed files with 67 additions and 12 deletions
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7
include/linux/ceph/ceph_fs.h
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@@ -522,8 +522,11 @@ struct ceph_mds_reply_dirfrag {
__le32 dist[];
} __attribute__ ((packed));
#define CEPH_LOCK_FCNTL 1
#define CEPH_LOCK_FLOCK 2
#define CEPH_LOCK_FCNTL 1
#define CEPH_LOCK_FLOCK 2
#define CEPH_LOCK_FCNTL_INTR 3
#define CEPH_LOCK_FLOCK_INTR 4
#define CEPH_LOCK_SHARED 1
#define CEPH_LOCK_EXCL 2