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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/fs/lockd/svclock.c
..
..
@@ -276,7 +276,7 @@
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 	dprintk("lockd: unlinking block %p...\n", block);
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 	/* Remove block from list */
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-	status = posix_unblock_lock(&block->b_call->a_args.lock.fl);
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+	status = locks_delete_block(&block->b_call->a_args.lock.fl);
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 	nlmsvc_remove_block(block);
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 	return status;
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 }
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..
@@ -332,6 +332,75 @@
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 	mutex_unlock(&file->f_mutex);
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 }
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+static struct nlm_lockowner *
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+nlmsvc_get_lockowner(struct nlm_lockowner *lockowner)
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+{
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+	refcount_inc(&lockowner->count);
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+	return lockowner;
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+}
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+
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+static void nlmsvc_put_lockowner(struct nlm_lockowner *lockowner)
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+{
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+	if (!refcount_dec_and_lock(&lockowner->count, &lockowner->host->h_lock))
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+		return;
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+	list_del(&lockowner->list);
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+	spin_unlock(&lockowner->host->h_lock);
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+	nlmsvc_release_host(lockowner->host);
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+	kfree(lockowner);
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+}
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+
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+static struct nlm_lockowner *__nlmsvc_find_lockowner(struct nlm_host *host, pid_t pid)
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+{
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+	struct nlm_lockowner *lockowner;
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+	list_for_each_entry(lockowner, &host->h_lockowners, list) {
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+		if (lockowner->pid != pid)
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+			continue;
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+		return nlmsvc_get_lockowner(lockowner);
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+	}
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+	return NULL;
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+}
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+
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+static struct nlm_lockowner *nlmsvc_find_lockowner(struct nlm_host *host, pid_t pid)
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+{
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+	struct nlm_lockowner *res, *new = NULL;
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+
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+	spin_lock(&host->h_lock);
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+	res = __nlmsvc_find_lockowner(host, pid);
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+
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+	if (res == NULL) {
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+		spin_unlock(&host->h_lock);
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+		new = kmalloc(sizeof(*res), GFP_KERNEL);
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+		spin_lock(&host->h_lock);
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+		res = __nlmsvc_find_lockowner(host, pid);
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+		if (res == NULL && new != NULL) {
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+			res = new;
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+			/* fs/locks.c will manage the refcount through lock_ops */
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+			refcount_set(&new->count, 1);
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+			new->pid = pid;
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+			new->host = nlm_get_host(host);
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+			list_add(&new->list, &host->h_lockowners);
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+			new = NULL;
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+		}
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+	}
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+
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+	spin_unlock(&host->h_lock);
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+	kfree(new);
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+	return res;
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+}
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+
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+void
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+nlmsvc_release_lockowner(struct nlm_lock *lock)
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+{
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+	if (lock->fl.fl_owner)
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+		nlmsvc_put_lockowner(lock->fl.fl_owner);
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+}
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+
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+void nlmsvc_locks_init_private(struct file_lock *fl, struct nlm_host *host,
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+						pid_t pid)
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+{
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+	fl->fl_owner = nlmsvc_find_lockowner(host, pid);
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+}
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+
335
404
 /*
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405
  * Initialize arguments for GRANTED call. The nlm_rqst structure
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406
  * has been cleared already.
..
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@@ -345,7 +414,7 @@
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414
 
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 	/* set default data area */
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 	call->a_args.lock.oh.data = call->a_owner;
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-	call->a_args.lock.svid = lock->fl.fl_pid;
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+	call->a_args.lock.svid = ((struct nlm_lockowner *)lock->fl.fl_owner)->pid;
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418
 
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 	if (lock->oh.len > NLMCLNT_OHSIZE) {
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420
 		void *data = kmalloc(lock->oh.len, GFP_KERNEL);
..
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@@ -509,6 +578,7 @@
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 {
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579
 	int			error;
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 	__be32			ret;
581
+	struct nlm_lockowner	*test_owner;
512
582
 
513
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 	dprintk("lockd: nlmsvc_testlock(%s/%ld, ty=%d, %Ld-%Ld)\n",
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584
 				locks_inode(file->f_file)->i_sb->s_id,
..
..
@@ -521,6 +591,9 @@
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 		ret = nlm_lck_denied_grace_period;
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 		goto out;
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593
 	}
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+
595
+	/* If there's a conflicting lock, remember to clean up the test lock */
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+	test_owner = (struct nlm_lockowner *)lock->fl.fl_owner;
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597
 
525
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 	error = vfs_test_lock(file->f_file, &lock->fl);
526
599
 	if (error) {
..
..
@@ -548,6 +621,11 @@
548
621
 	conflock->fl.fl_start = lock->fl.fl_start;
549
622
 	conflock->fl.fl_end = lock->fl.fl_end;
550
623
 	locks_release_private(&lock->fl);
624
+
625
+	/* Clean up the test lock */
626
+	lock->fl.fl_owner = NULL;
627
+	nlmsvc_put_lockowner(test_owner);
628
+
551
629
 	ret = nlm_lck_denied;
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630
 out:
553
631
 	return ret;
..
..
@@ -692,27 +770,21 @@
692
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 	printk(KERN_WARNING "lockd: notification for unknown block!\n");
693
771
 }
694
772
 
695
-static int nlmsvc_same_owner(struct file_lock *fl1, struct file_lock *fl2)
773
+static fl_owner_t nlmsvc_get_owner(fl_owner_t owner)
696
774
 {
697
-	return fl1->fl_owner == fl2->fl_owner && fl1->fl_pid == fl2->fl_pid;
775
+	return nlmsvc_get_lockowner(owner);
698
776
 }
699
777
 
700
-/*
701
- * Since NLM uses two "keys" for tracking locks, we need to hash them down
702
- * to one for the blocked_hash. Here, we're just xor'ing the host address
703
- * with the pid in order to create a key value for picking a hash bucket.
704
- */
705
-static unsigned long
706
-nlmsvc_owner_key(struct file_lock *fl)
778
+static void nlmsvc_put_owner(fl_owner_t owner)
707
779
 {
708
-	return (unsigned long)fl->fl_owner ^ (unsigned long)fl->fl_pid;
780
+	nlmsvc_put_lockowner(owner);
709
781
 }
710
782
 
711
783
 const struct lock_manager_operations nlmsvc_lock_operations = {
712
-	.lm_compare_owner = nlmsvc_same_owner,
713
-	.lm_owner_key = nlmsvc_owner_key,
714
784
 	.lm_notify = nlmsvc_notify_blocked,
715
785
 	.lm_grant = nlmsvc_grant_deferred,
786
+	.lm_get_owner = nlmsvc_get_owner,
787
+	.lm_put_owner = nlmsvc_put_owner,
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788
 };
717
789
 
718
790
 /*