Rename hole_birth tunable to match OpenZFS

OpenZFS decided that ignore_hole_birth was too imprecise and
incorrect a name (and went with send_holes_without_birth_time).
Rename it in ZoL too, while keeping the name "ignore_hole_birth"
pointing to the same variable for existing consumers.

Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes #5239

diff --git a/module/zfs/dmu_traverse.c b/module/zfs/dmu_traverse.c
index 50607352a749346e835f80b1840f7067e2a6c4df..a2566ced3211eac30eafa7ae5a3743b4a3950a20 100644 (file)
--- a/module/zfs/dmu_traverse.c
+++ b/module/zfs/dmu_traverse.c
@@ -39,7 +39,7 @@
 #include <sys/zfeature.h>
 
 int32_t zfs_pd_bytes_max = 50 * 1024 * 1024;   /* 50MB */
-int32_t ignore_hole_birth = 1;
+int32_t send_holes_without_birth_time = 1;
 
 typedef struct prefetch_data {
        kmutex_t pd_mtx;
@@ -252,9 +252,10 @@ traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp,
                 *
                 * Note that the meta-dnode cannot be reallocated.
                 */
-               if (!ignore_hole_birth && (!td->td_realloc_possible ||
-                       zb->zb_object == DMU_META_DNODE_OBJECT) &&
-                       td->td_hole_birth_enabled_txg <= td->td_min_txg)
+               if (!send_holes_without_birth_time &&
+                   (!td->td_realloc_possible ||
+                   zb->zb_object == DMU_META_DNODE_OBJECT) &&
+                   td->td_hole_birth_enabled_txg <= td->td_min_txg)
                        return (0);
        } else if (bp->blk_birth <= td->td_min_txg) {
                return (0);
@@ -729,6 +730,11 @@ EXPORT_SYMBOL(traverse_pool);
 module_param(zfs_pd_bytes_max, int, 0644);
 MODULE_PARM_DESC(zfs_pd_bytes_max, "Max number of bytes to prefetch");
 
-module_param(ignore_hole_birth, int, 0644);
-MODULE_PARM_DESC(ignore_hole_birth, "Ignore hole_birth txg for send");
+module_param_named(ignore_hole_birth, send_holes_without_birth_time, int, 0644);
+MODULE_PARM_DESC(ignore_hole_birth, "Alias for send_holes_without_birth_time");
+
+module_param_named(send_holes_without_birth_time,
+       send_holes_without_birth_time, int, 0644);
+MODULE_PARM_DESC(send_holes_without_birth_time,
+       "Ignore hole_birth txg for zfs send");
 #endif