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zfs: com.delphix:hole_birth feature support 

In the past birth was always zero for holes. This feature started
to make use of birth for holes as well, so change code to test for
valid DVA address instead.
This commit is contained in:
Toomas Soome 2015-04-16 08:22:08 +03:00 committed by Andrei Borzenkov
parent 104dff36ea
commit a1007c6af2
2 changed files with 7 additions and 3 deletions
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6
grub-core/fs/zfs/zfs.c
View File

@ -280,7 +280,9 @@ grub_crypto_cipher_handle_t (*grub_zfs_load_key) (const struct grub_zfs_key *key
*/
#define MAX_SUPPORTED_FEATURE_STRLEN 50
static const char *spa_feature_names[] = {
"org.illumos:lz4_compress",NULL
"org.illumos:lz4_compress",
"com.delphix:hole_birth",
NULL
};
static int
@ -1751,7 +1753,7 @@ zio_read_gang (blkptr_t * bp, grub_zfs_endian_t endian, dva_t * dva, void *buf,
for (i = 0; i < SPA_GBH_NBLKPTRS; i++)
{
if (zio_gb->zg_blkptr[i].blk_birth == 0)
if (BP_IS_HOLE(&zio_gb->zg_blkptr[i]))
continue;
err = zio_read_data (&zio_gb->zg_blkptr[i], endian, buf, data);

4
include/grub/zfs/spa.h
View File

@ -279,7 +279,9 @@ typedef struct blkptr {
#define BP_IDENTITY(bp) (&(bp)->blk_dva[0])
#define BP_IS_GANG(bp) DVA_GET_GANG(BP_IDENTITY(bp))
#define BP_IS_HOLE(bp) ((bp)->blk_birth == 0)
#define DVA_IS_EMPTY(dva) ((dva)->dva_word[0] == 0ULL && \
(dva)->dva_word[1] == 0ULL)
#define BP_IS_HOLE(bp) DVA_IS_EMPTY(BP_IDENTITY(bp))
/* BP_IS_RAIDZ(bp) assumes no block compression */
#define BP_IS_RAIDZ(bp) (DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \