diff options
Diffstat (limited to 'module/zfs')
| -rw-r--r-- | module/zfs/zfs_ioctl.c | 3 | ||||
| -rw-r--r-- | module/zfs/zvol.c | 62 |
2 files changed, 62 insertions, 3 deletions
diff --git a/module/zfs/zfs_ioctl.c b/module/zfs/zfs_ioctl.c index e804cce08..5560b2548 100644 --- a/module/zfs/zfs_ioctl.c +++ b/module/zfs/zfs_ioctl.c @@ -2184,6 +2184,9 @@ zfs_prop_set_special(const char *dsname, zprop_source_t source, case ZFS_PROP_VOLSIZE: err = zvol_set_volsize(dsname, intval); break; + case ZFS_PROP_SNAPDEV: + err = zvol_set_snapdev(dsname, intval); + break; case ZFS_PROP_VERSION: { zfs_sb_t *zsb; diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c index b0d59fe0c..b41eeb202 100644 --- a/module/zfs/zvol.c +++ b/module/zfs/zvol.c @@ -1288,7 +1288,28 @@ zvol_free(zvol_state_t *zv) } static int -__zvol_create_minor(const char *name) +__zvol_snapdev_hidden(const char *name) +{ + uint64_t snapdev; + char *parent; + char *atp; + int error = 0; + + parent = kmem_alloc(MAXPATHLEN, KM_SLEEP); + (void) strlcpy(parent, name, MAXPATHLEN); + + if ((atp = strrchr(parent, '@')) != NULL) { + *atp = '\0'; + error = dsl_prop_get_integer(parent, "snapdev", &snapdev, NULL); + if ((error == 0) && (snapdev == ZFS_SNAPDEV_HIDDEN)) + error = ENODEV; + } + kmem_free(parent, MAXPATHLEN); + return (error); +} + +static int +__zvol_create_minor(const char *name, boolean_t ignore_snapdev) { zvol_state_t *zv; objset_t *os; @@ -1305,6 +1326,12 @@ __zvol_create_minor(const char *name) goto out; } + if (ignore_snapdev == B_FALSE) { + error = __zvol_snapdev_hidden(name); + if (error) + goto out; + } + doi = kmem_alloc(sizeof(dmu_object_info_t), KM_SLEEP); error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, zvol_tag, &os); @@ -1386,7 +1413,7 @@ zvol_create_minor(const char *name) int error; mutex_enter(&zvol_state_lock); - error = __zvol_create_minor(name); + error = __zvol_create_minor(name, B_FALSE); mutex_exit(&zvol_state_lock); return (error); @@ -1434,7 +1461,7 @@ zvol_create_minors_cb(spa_t *spa, uint64_t dsobj, if (strchr(dsname, '/') == NULL) return 0; - (void) __zvol_create_minor(dsname); + (void) __zvol_create_minor(dsname, B_FALSE); return (0); } @@ -1502,6 +1529,35 @@ zvol_remove_minors(const char *pool) kmem_free(str, MAXNAMELEN); } +static int +snapdev_snapshot_changed_cb(const char *dsname, void *arg) { + uint64_t snapdev = *(uint64_t *) arg; + + if (strchr(dsname, '@') == NULL) + return 0; + + switch (snapdev) { + case ZFS_SNAPDEV_VISIBLE: + mutex_enter(&zvol_state_lock); + (void) __zvol_create_minor(dsname, B_TRUE); + mutex_exit(&zvol_state_lock); + break; + case ZFS_SNAPDEV_HIDDEN: + (void) zvol_remove_minor(dsname); + break; + } + return 0; +} + +int +zvol_set_snapdev(const char *dsname, uint64_t snapdev) { + (void) dmu_objset_find((char *) dsname, snapdev_snapshot_changed_cb, + &snapdev, DS_FIND_SNAPSHOTS | DS_FIND_CHILDREN); + /* caller should continue to modify snapdev property */ + return (-1); +} + + int zvol_init(void) { |