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In zvol_open() if the spa_namespace_lock is already held, it means that

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ZFS is trying to open and taste ZVOL as its VDEV. This is not supported,
so return an error instead of panicing on spa_namespace_lock recursion.

Reported by:	Robert Millan <rmh@debian.org>
PR:		kern/162008
MFC after:	3 days
This commit is contained in:
pjd 2011-11-05 16:29:03 +00:00
parent e58889997a
commit 926e106e80
1 changed files with 8 additions and 0 deletions
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8
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c
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@ -875,6 +875,14 @@ zvol_open(struct g_provider *pp, int flag, int count)
zvol_state_t *zv;
int err = 0;
if (MUTEX_HELD(&spa_namespace_lock)) {
/*
* If the spa_namespace_lock is being held, it means that ZFS
* is trying to open ZVOL as its VDEV. This i not supported.
*/
return (EOPNOTSUPP);
}
mutex_enter(&spa_namespace_lock);
zv = pp->private;