HAMMER - Add hammer dedup directive and support

* Adjust the utility to exit with an appropriate error if an
  attempt is made to dedup a filesystem which has not been upgraded
  to version 5.

diff --git a/sbin/hammer/cmd_dedup.c b/sbin/hammer/cmd_dedup.c
index 6e8d21d..872a474 100644 (file)
--- a/sbin/hammer/cmd_dedup.c
+++ b/sbin/hammer/cmd_dedup.c
@@ -339,6 +339,7 @@ validate_dedup_pair(hammer_btree_leaf_elm_t p, hammer_btree_leaf_elm_t q)
 #define DEDUP_CMP_FAILURE      2
 #define DEDUP_INVALID_ZONE     3
 #define DEDUP_UNDERFLOW                4
+#define DEDUP_VERS_FAILURE     5
 
 static __inline int
 deduplicate(hammer_btree_leaf_elm_t p, hammer_btree_leaf_elm_t q)
@@ -359,6 +360,10 @@ deduplicate(hammer_btree_leaf_elm_t p, hammer_btree_leaf_elm_t q)
        dedup.elm2 = q->base;
        RunningIoctl = 1;
        if (ioctl(glob_fd, HAMMERIOC_DEDUP, &dedup) < 0) {
+               if (errno == EOPNOTSUPP) {
+                       /* must be at least version 5 */
+                       return (DEDUP_VERS_FAILURE);
+               }
                /* Technical failure - locking or w/e */
                return (DEDUP_TECH_FAILURE);
        }
@@ -447,6 +452,8 @@ process_btree_elm(hammer_btree_leaf_elm_t scan_leaf, int flags)
                 */
                error = deduplicate(&sha_de->leaf, scan_leaf);
                switch(error) {
+               case 0:
+                       goto upgrade_stats_sha;
                case DEDUP_TECH_FAILURE:
                        goto pass2_insert;
                case DEDUP_CMP_FAILURE:
@@ -458,8 +465,14 @@ process_btree_elm(hammer_btree_leaf_elm_t scan_leaf, int flags)
                        sha_de->leaf = *scan_leaf;
                        memcpy(sha_de->sha_hash, temp.sha_hash, SHA256_DIGEST_LENGTH);
                        goto upgrade_stats_sha;
+               case DEDUP_VERS_FAILURE:
+                       fprintf(stderr,
+                               "HAMMER filesystem must be at least "
+                               "version 5 to dedup\n");
+                       exit (1);
                default:
-                       goto upgrade_stats_sha;
+                       fprintf(stderr, "Unknown error\n");
+                       goto terminate_early;
                }
 
                /*
@@ -483,6 +496,8 @@ sha256_failure:
                 */
                error = deduplicate(&de->leaf, scan_leaf);
                switch(error) {
+               case 0:
+                       goto upgrade_stats;
                case DEDUP_TECH_FAILURE:
                        goto pass2_insert;
                case DEDUP_CMP_FAILURE:
@@ -493,8 +508,14 @@ sha256_failure:
                        ++dedup_underflows;
                        de->leaf = *scan_leaf;
                        goto upgrade_stats;
+               case DEDUP_VERS_FAILURE:
+                       fprintf(stderr,
+                               "HAMMER filesystem must be at least "
+                               "version 5 to dedup\n");
+                       exit (1);
                default:
-                       goto upgrade_stats;
+                       fprintf(stderr, "Unknown error\n");
+                       goto terminate_early;
                }
 
 crc_failure: