25838 want prevsnap property

delphix · May 30, 2013 · 95378d0 · 95378d0
1 parent c3441b7
commit 95378d0
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diff --git a/usr/src/common/zfs/zfs_prop.c b/usr/src/common/zfs/zfs_prop.c
@@ -406,6 +406,8 @@ zfs_prop_init(void)
 	    PROP_READONLY, ZFS_TYPE_DATASET, "UNIQUE");
 	zprop_register_hidden(ZFS_PROP_OBJSETID, "objsetid", PROP_TYPE_NUMBER,
 	    PROP_READONLY, ZFS_TYPE_DATASET, "OBJSETID");
+	zprop_register_hidden(ZFS_PROP_PREV_SNAP, "prevsnap", PROP_TYPE_STRING,
+	    PROP_READONLY, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME, "PREVSNAP");
 
 	/* oddball properties */
 	zprop_register_impl(ZFS_PROP_CREATION, "creation", PROP_TYPE_NUMBER, 0,

diff --git a/usr/src/uts/common/fs/zfs/dsl_dataset.c b/usr/src/uts/common/fs/zfs/dsl_dataset.c
@@ -1386,6 +1386,12 @@ dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
 		    ds->ds_phys->ds_unique_bytes);
 		get_clones_stat(ds, nv);
 	} else {
+		if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) {
+			char buf[MAXNAMELEN];
+			dsl_dataset_name(ds->ds_prev, buf);
+			dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf);
+		}
+
 		dsl_dir_stats(ds->ds_dir, nv);
 	}
 

diff --git a/usr/src/uts/common/sys/fs/zfs.h b/usr/src/uts/common/sys/fs/zfs.h
@@ -141,6 +141,7 @@ typedef enum {
 	ZFS_PROP_LOGICALUSED,
 	ZFS_PROP_LOGICALREFERENCED,
 	ZFS_PROP_REDUNDANT_METADATA,
+	ZFS_PROP_PREV_SNAP,
 	ZFS_NUM_PROPS
 } zfs_prop_t;