Add zvol_inhibit_dev module option.

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

diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c
index ba26543..125d58d 100644 (file)
--- a/module/zfs/zvol.c
+++ b/module/zfs/zvol.c
@@ -46,6 +46,7 @@
 #include <sys/zvol.h>
 #include <linux/blkdev_compat.h>
 
+unsigned int zvol_inhibit_dev = 0;
 unsigned int zvol_major = ZVOL_MAJOR;
 unsigned int zvol_threads = 32;
 
@@ -1341,6 +1342,9 @@ zvol_create_minors(const char *pool)
        spa_t *spa = NULL;
        int error = 0;
 
+       if (zvol_inhibit_dev)
+               return (0);
+
        mutex_enter(&zvol_state_lock);
        if (pool) {
                error = dmu_objset_find_spa(NULL, pool, zvol_create_minors_cb,
@@ -1370,6 +1374,9 @@ zvol_remove_minors(const char *pool)
        zvol_state_t *zv, *zv_next;
        char *str;
 
+       if (zvol_inhibit_dev)
+               return;
+
        str = kmem_zalloc(MAXNAMELEN, KM_SLEEP);
        if (pool) {
                (void) strncpy(str, pool, strlen(pool));
@@ -1431,6 +1438,9 @@ zvol_fini(void)
        list_destroy(&zvol_state_list);
 }
 
+module_param(zvol_inhibit_dev, uint, 0644);
+MODULE_PARM_DESC(zvol_inhibit_dev, "Do not create zvol device nodes");
+
 module_param(zvol_major, uint, 0444);
 MODULE_PARM_DESC(zvol_major, "Major number for zvol device");