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[DLM] fix user unlocking 

When a user process exits, we clear all the locks it holds.  There is a
problem, though, with locks that the process had begun unlocking before it
exited.  We couldn't find the lkb's that were in the process of being
unlocked remotely, to flag that they are DEAD.  To solve this, we move
lkb's being unlocked onto a new list in the per-process structure that
tracks what locks the process is holding.  We can then go through this
list to flag the necessary lkb's when clearing locks for a process when it
exits.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
David Teigland 2007-01-15 10:34:52 -06:00 committed by Steven Whitehouse
parent 1d6e8131cf
commit a1bc86e6bd
3 changed files with 28 additions and 12 deletions
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1
fs/dlm/dlm_internal.h
View File

@ -526,6 +526,7 @@ struct dlm_user_proc {
spinlock_t asts_spin;
struct list_head locks;
spinlock_t locks_spin;
struct list_head unlocking;
wait_queue_head_t wait;
};

30
fs/dlm/lock.c
View File

@ -3772,12 +3772,10 @@ int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
goto out_put;
spin_lock(&ua->proc->locks_spin);
list_del_init(&lkb->lkb_ownqueue);
/* dlm_user_add_ast() may have already taken lkb off the proc list */
if (!list_empty(&lkb->lkb_ownqueue))
list_move(&lkb->lkb_ownqueue, &ua->proc->unlocking);
spin_unlock(&ua->proc->locks_spin);
/* this removes the reference for the proc->locks list added by
dlm_user_request */
unhold_lkb(lkb);
out_put:
dlm_put_lkb(lkb);
out:
@ -3817,9 +3815,8 @@ int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
/* this lkb was removed from the WAITING queue */
if (lkb->lkb_grmode == DLM_LOCK_IV) {
spin_lock(&ua->proc->locks_spin);
list_del_init(&lkb->lkb_ownqueue);
list_move(&lkb->lkb_ownqueue, &ua->proc->unlocking);
spin_unlock(&ua->proc->locks_spin);
unhold_lkb(lkb);
}
out_put:
dlm_put_lkb(lkb);
@ -3880,11 +3877,6 @@ void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc)
mutex_lock(&ls->ls_clear_proc_locks);
list_for_each_entry_safe(lkb, safe, &proc->locks, lkb_ownqueue) {
if (lkb->lkb_ast_type) {
list_del(&lkb->lkb_astqueue);
unhold_lkb(lkb);
}
list_del_init(&lkb->lkb_ownqueue);
if (lkb->lkb_exflags & DLM_LKF_PERSISTENT) {
@ -3901,6 +3893,20 @@ void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc)
dlm_put_lkb(lkb);
}
/* in-progress unlocks */
list_for_each_entry_safe(lkb, safe, &proc->unlocking, lkb_ownqueue) {
list_del_init(&lkb->lkb_ownqueue);
lkb->lkb_flags |= DLM_IFL_DEAD;
dlm_put_lkb(lkb);
}
list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_astqueue) {
list_del(&lkb->lkb_astqueue);
dlm_put_lkb(lkb);
}
mutex_unlock(&ls->ls_clear_proc_locks);
unlock_recovery(ls);
}

9
fs/dlm/user.c
View File

@ -180,6 +180,14 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, int type)
ua->lksb.sb_status == -EAGAIN && !list_empty(&lkb->lkb_ownqueue))
remove_ownqueue = 1;
/* unlocks or cancels of waiting requests need to be removed from the
proc's unlocking list, again there must be a better way... */
if (ua->lksb.sb_status == -DLM_EUNLOCK ||
(ua->lksb.sb_status == -DLM_ECANCEL &&
lkb->lkb_grmode == DLM_LOCK_IV))
remove_ownqueue = 1;
/* We want to copy the lvb to userspace when the completion
ast is read if the status is 0, the lock has an lvb and
lvb_ops says we should. We could probably have set_lvb_lock()
@ -523,6 +531,7 @@ static int device_open(struct inode *inode, struct file *file)
proc->lockspace = ls->ls_local_handle;
INIT_LIST_HEAD(&proc->asts);
INIT_LIST_HEAD(&proc->locks);
INIT_LIST_HEAD(&proc->unlocking);
spin_lock_init(&proc->asts_spin);
spin_lock_init(&proc->locks_spin);
init_waitqueue_head(&proc->wait);