Illumos 4370, 4371

4370 avoid transmitting holes during zfs send
4371 DMU code clean up

Reviewed by: Matthew Ahrens <[email protected]>
Reviewed by: George Wilson <[email protected]>
Reviewed by: Christopher Siden <[email protected]>
Reviewed by: Josef 'Jeff' Sipek <[email protected]>
Approved by: Garrett D'Amore <[email protected]>a

References:
  https://www.illumos.org/issues/4370
  https://www.illumos.org/issues/4371
  https://github.com/illumos/illumos-gate/commit/43466aa

Ported by: Tim Chase <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #2529

1 files changed, 41 insertions, 6 deletions

diff --git a/module/zfs/zfeature_common.c b/module/zfs/zfeature_common.c
index 5bcc08ade..35e662ee2 100644
--- a/module/zfs/zfeature_common.c
+++ b/module/zfs/zfeature_common.c
@@ -119,10 +119,22 @@ zfeature_lookup_name(const char *name, spa_feature_t *res)
 	return (ENOENT);
 }
 
+boolean_t
+zfeature_depends_on(spa_feature_t fid, spa_feature_t check) {
+	zfeature_info_t *feature = &spa_feature_table[fid];
+	int i;
+
+	for (i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++) {
+		if (feature->fi_depends[i] == check)
+			return (B_TRUE);
+	}
+	return (B_FALSE);
+}
+
 static void
 zfeature_register(spa_feature_t fid, const char *guid, const char *name,
     const char *desc, boolean_t readonly, boolean_t mos,
-    const spa_feature_t *deps)
+    boolean_t activate_on_enable, const spa_feature_t *deps)
 {
 	zfeature_info_t *feature = &spa_feature_table[fid];
 	static spa_feature_t nodeps[] = { SPA_FEATURE_NONE };
@@ -142,6 +154,7 @@ zfeature_register(spa_feature_t fid, const char *guid, const char *name,
 	feature->fi_desc = desc;
 	feature->fi_can_readonly = readonly;
 	feature->fi_mos = mos;
+	feature->fi_activate_on_enable = activate_on_enable;
 	feature->fi_depends = deps;
 }
 
@@ -150,18 +163,40 @@ zpool_feature_init(void)
 {
 	zfeature_register(SPA_FEATURE_ASYNC_DESTROY,
 	    "com.delphix:async_destroy", "async_destroy",
-	    "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, NULL);
+	    "Destroy filesystems asynchronously.", B_TRUE, B_FALSE,
+	    B_FALSE, NULL);
+
 	zfeature_register(SPA_FEATURE_EMPTY_BPOBJ,
 	    "com.delphix:empty_bpobj", "empty_bpobj",
-	    "Snapshots use less space.", B_TRUE, B_FALSE, NULL);
+	    "Snapshots use less space.", B_TRUE, B_FALSE,
+	    B_FALSE, NULL);
+
 	zfeature_register(SPA_FEATURE_LZ4_COMPRESS,
 	    "org.illumos:lz4_compress", "lz4_compress",
-	    "LZ4 compression algorithm support.", B_FALSE, B_FALSE, NULL);
+	    "LZ4 compression algorithm support.", B_FALSE, B_FALSE,
+	    B_FALSE, NULL);
+
 	zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM,
 	    "com.delphix:spacemap_histogram", "spacemap_histogram",
-	    "Spacemaps maintain space histograms.", B_TRUE, B_FALSE, NULL);
+	    "Spacemaps maintain space histograms.", B_TRUE, B_FALSE,
+	    B_FALSE, NULL);
+
+	zfeature_register(SPA_FEATURE_ENABLED_TXG,
+	    "com.delphix:enabled_txg", "enabled_txg",
+	    "Record txg at which a feature is enabled", B_TRUE, B_FALSE,
+	    B_FALSE, NULL);
+
+	{
+	static spa_feature_t hole_birth_deps[] = { SPA_FEATURE_ENABLED_TXG,
+	    SPA_FEATURE_NONE };
+	zfeature_register(SPA_FEATURE_HOLE_BIRTH,
+	    "com.delphix:hole_birth", "hole_birth",
+	    "Retain hole birth txg for more precise zfs send",
+	    B_FALSE, B_TRUE, B_TRUE, hole_birth_deps);
+	}
+
 	zfeature_register(SPA_FEATURE_EXTENSIBLE_DATASET,
 	    "com.delphix:extensible_dataset", "extensible_dataset",
 	    "Enhanced dataset functionality, used by other features.",
-	    B_FALSE, B_FALSE, NULL);
+	    B_FALSE, B_FALSE, B_FALSE, NULL);
 }