diff options
Diffstat (limited to 'module/zfs/dmu_objset.c')
| -rw-r--r-- | module/zfs/dmu_objset.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/module/zfs/dmu_objset.c b/module/zfs/dmu_objset.c index 0703a9466..1d0b4619f 100644 --- a/module/zfs/dmu_objset.c +++ b/module/zfs/dmu_objset.c @@ -1584,6 +1584,41 @@ dmu_snapshot_list_next(objset_t *os, int namelen, char *name, return (0); } +/* + * Determine the objset id for a given snapshot name. + */ +int +dmu_snapshot_id(objset_t *os, const char *snapname, uint64_t *idp) +{ + dsl_dataset_t *ds = os->os_dsl_dataset; + zap_cursor_t cursor; + zap_attribute_t attr; + int error; + + if (ds->ds_phys->ds_snapnames_zapobj == 0) + return (ENOENT); + + zap_cursor_init(&cursor, ds->ds_dir->dd_pool->dp_meta_objset, + ds->ds_phys->ds_snapnames_zapobj); + + error = zap_cursor_move_to_key(&cursor, snapname, MT_EXACT); + if (error) { + zap_cursor_fini(&cursor); + return (error); + } + + error = zap_cursor_retrieve(&cursor, &attr); + if (error) { + zap_cursor_fini(&cursor); + return (error); + } + + *idp = attr.za_first_integer; + zap_cursor_fini(&cursor); + + return (0); +} + int dmu_dir_list_next(objset_t *os, int namelen, char *name, uint64_t *idp, uint64_t *offp) |