From 8b4021fa436f7c76a2299e6d85d4d4a619724e9a Mon Sep 17 00:00:00 2001 From: David Teigland Date: Tue, 29 May 2007 08:46:00 -0500 Subject: [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 Signed-off-by: Steven Whitehouse --- fs/dlm/user.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'fs/dlm/user.c') diff --git a/fs/dlm/user.c b/fs/dlm/user.c index 329da1b5285..6438941ab1f 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"); -- cgit v1.2.3