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-rw-r--r--fs/dlm/plock.c65
1 files changed, 61 insertions, 4 deletions
diff --git a/fs/dlm/plock.c b/fs/dlm/plock.c
index 30d8b85febbf..e2b878004364 100644
--- a/fs/dlm/plock.c
+++ b/fs/dlm/plock.c
@@ -71,6 +71,36 @@ static void send_op(struct plock_op *op)
wake_up(&send_wq);
}
+/* If a process was killed while waiting for the only plock on a file,
+ locks_remove_posix will not see any lock on the file so it won't
+ send an unlock-close to us to pass on to userspace to clean up the
+ abandoned waiter. So, we have to insert the unlock-close when the
+ lock call is interrupted. */
+
+static void do_unlock_close(struct dlm_ls *ls, u64 number,
+ struct file *file, struct file_lock *fl)
+{
+ struct plock_op *op;
+
+ op = kzalloc(sizeof(*op), GFP_NOFS);
+ if (!op)
+ return;
+
+ op->info.optype = DLM_PLOCK_OP_UNLOCK;
+ op->info.pid = fl->fl_pid;
+ op->info.fsid = ls->ls_global_id;
+ op->info.number = number;
+ op->info.start = 0;
+ op->info.end = OFFSET_MAX;
+ if (fl->fl_lmops && fl->fl_lmops->fl_grant)
+ op->info.owner = (__u64) fl->fl_pid;
+ else
+ op->info.owner = (__u64)(long) fl->fl_owner;
+
+ op->info.flags |= DLM_PLOCK_FL_CLOSE;
+ send_op(op);
+}
+
int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
int cmd, struct file_lock *fl)
{
@@ -114,9 +144,19 @@ int dlm_posix_lock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
send_op(op);
- if (xop->callback == NULL)
- wait_event(recv_wq, (op->done != 0));
- else {
+ if (xop->callback == NULL) {
+ rv = wait_event_killable(recv_wq, (op->done != 0));
+ if (rv == -ERESTARTSYS) {
+ log_debug(ls, "dlm_posix_lock: wait killed %llx",
+ (unsigned long long)number);
+ spin_lock(&ops_lock);
+ list_del(&op->list);
+ spin_unlock(&ops_lock);
+ kfree(xop);
+ do_unlock_close(ls, number, file, fl);
+ goto out;
+ }
+ } else {
rv = FILE_LOCK_DEFERRED;
goto out;
}
@@ -233,6 +273,13 @@ int dlm_posix_unlock(dlm_lockspace_t *lockspace, u64 number, struct file *file,
else
op->info.owner = (__u64)(long) fl->fl_owner;
+ if (fl->fl_flags & FL_CLOSE) {
+ op->info.flags |= DLM_PLOCK_FL_CLOSE;
+ send_op(op);
+ rv = 0;
+ goto out;
+ }
+
send_op(op);
wait_event(recv_wq, (op->done != 0));
@@ -334,7 +381,10 @@ static ssize_t dev_read(struct file *file, char __user *u, size_t count,
spin_lock(&ops_lock);
if (!list_empty(&send_list)) {
op = list_entry(send_list.next, struct plock_op, list);
- list_move(&op->list, &recv_list);
+ if (op->info.flags & DLM_PLOCK_FL_CLOSE)
+ list_del(&op->list);
+ else
+ list_move(&op->list, &recv_list);
memcpy(&info, &op->info, sizeof(info));
}
spin_unlock(&ops_lock);
@@ -342,6 +392,13 @@ static ssize_t dev_read(struct file *file, char __user *u, size_t count,
if (!op)
return -EAGAIN;
+ /* there is no need to get a reply from userspace for unlocks
+ that were generated by the vfs cleaning up for a close
+ (the process did not make an unlock call). */
+
+ if (op->info.flags & DLM_PLOCK_FL_CLOSE)
+ kfree(op);
+
if (copy_to_user(u, &info, sizeof(info)))
return -EFAULT;
return sizeof(info);