Honor logbias when writing to ZVOLs.

[zfs.git] / module / zfs / zfs_vfsops.c

diff --git a/module/zfs/zfs_vfsops.c b/module/zfs/zfs_vfsops.c
index 8f1c713..998cfde 100644 (file)
--- a/module/zfs/zfs_vfsops.c
+++ b/module/zfs/zfs_vfsops.c
@@ -1231,7 +1231,7 @@ zfs_preumount(struct super_block *sb)
 {
        zfs_sb_t *zsb = sb->s_fs_info;
 
-       if (zsb->z_ctldir != NULL)
+       if (zsb != NULL && zsb->z_ctldir != NULL)
                zfsctl_destroy(zsb);
 }
 EXPORT_SYMBOL(zfs_preumount);