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| author | David Teigland <teigland@redhat.com> | 2007-05-29 17:46:00 +0400 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2007-07-09 11:22:54 +0400 |
| commit | 8b4021fa436f7c76a2299e6d85d4d4a619724e9a (patch) | |
| tree | 4e3be51910ede8a36d640229bb1d20d3f7547652 /fs/dlm/user.c | |
| parent | 84d8cd69a8e7f1c9962f46bc79850c9f1f663806 (diff) | |
| download | linux-8b4021fa436f7c76a2299e6d85d4d4a619724e9a.tar.xz | |
[DLM] canceling deadlocked lock
Add a function that can be used through libdlm by a system daemon to cancel
another process's deadlocked lock. A completion ast with EDEADLK is returned
to the process waiting for the lock.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/dlm/user.c')
| -rw-r--r-- | fs/dlm/user.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/dlm/user.c b/fs/dlm/user.c index 329da1b5285f..6438941ab1f8 100644 --- a/fs/dlm/user.c +++ b/fs/dlm/user.c @@ -156,6 +156,7 @@ static int lkb_is_endoflife(struct dlm_lkb *lkb, int sb_status, int type) return 1; case -DLM_ECANCEL: case -ETIMEDOUT: + case -EDEADLK: if (lkb->lkb_grmode == DLM_LOCK_IV) return 1; break; @@ -320,6 +321,22 @@ static int device_user_unlock(struct dlm_user_proc *proc, return error; } +static int device_user_deadlock(struct dlm_user_proc *proc, + struct dlm_lock_params *params) +{ + struct dlm_ls *ls; + int error; + + ls = dlm_find_lockspace_local(proc->lockspace); + if (!ls) + return -ENOENT; + + error = dlm_user_deadlock(ls, params->flags, params->lkid); + + dlm_put_lockspace(ls); + return error; +} + static int create_misc_device(struct dlm_ls *ls, char *name) { int error, len; @@ -545,6 +562,14 @@ static ssize_t device_write(struct file *file, const char __user *buf, error = device_user_unlock(proc, &kbuf->i.lock); break; + case DLM_USER_DEADLOCK: + if (!proc) { + log_print("no locking on control device"); + goto out_sig; + } + error = device_user_deadlock(proc, &kbuf->i.lock); + break; + case DLM_USER_CREATE_LOCKSPACE: if (proc) { log_print("create/remove only on control device"); |