diff options
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c')
-rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c | 42 |
1 files changed, 34 insertions, 8 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c index c7be1b4..bebb0f3 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c @@ -39,6 +39,23 @@ SYSCTL_INT(_vfs_zfs, OID_AUTO, space_map_last_hope, CTLFLAG_RDTUN, &space_map_last_hope, 0, "If kernel panic in space_map code on pool import, import the pool in readonly mode and backup all your data before trying this option."); +static kmem_cache_t *space_seg_cache; + +void +space_map_init(void) +{ + ASSERT(space_seg_cache == NULL); + space_seg_cache = kmem_cache_create("space_seg_cache", + sizeof (space_seg_t), 0, NULL, NULL, NULL, NULL, NULL, 0); +} + +void +space_map_fini(void) +{ + kmem_cache_destroy(space_seg_cache); + space_seg_cache = NULL; +} + /* * Space map routines. * NOTE: caller is responsible for all locking. @@ -148,7 +165,7 @@ again: avl_remove(sm->sm_pp_root, ss_after); } ss_after->ss_start = ss_before->ss_start; - kmem_free(ss_before, sizeof (*ss_before)); + kmem_cache_free(space_seg_cache, ss_before); ss = ss_after; } else if (merge_before) { ss_before->ss_end = end; @@ -161,7 +178,7 @@ again: avl_remove(sm->sm_pp_root, ss_after); ss = ss_after; } else { - ss = kmem_alloc(sizeof (*ss), KM_SLEEP); + ss = kmem_cache_alloc(space_seg_cache, KM_SLEEP); ss->ss_start = start; ss->ss_end = end; avl_insert(&sm->sm_root, ss, where); @@ -207,7 +224,7 @@ space_map_remove(space_map_t *sm, uint64_t start, uint64_t size) avl_remove(sm->sm_pp_root, ss); if (left_over && right_over) { - newseg = kmem_alloc(sizeof (*newseg), KM_SLEEP); + newseg = kmem_cache_alloc(space_seg_cache, KM_SLEEP); newseg->ss_start = end; newseg->ss_end = ss->ss_end; ss->ss_end = start; @@ -220,7 +237,7 @@ space_map_remove(space_map_t *sm, uint64_t start, uint64_t size) ss->ss_start = end; } else { avl_remove(&sm->sm_root, ss); - kmem_free(ss, sizeof (*ss)); + kmem_cache_free(space_seg_cache, ss); ss = NULL; } @@ -260,7 +277,7 @@ space_map_vacate(space_map_t *sm, space_map_func_t *func, space_map_t *mdest) while ((ss = avl_destroy_nodes(&sm->sm_root, &cookie)) != NULL) { if (func != NULL) func(mdest, ss->ss_start, ss->ss_end - ss->ss_start); - kmem_free(ss, sizeof (*ss)); + kmem_cache_free(space_seg_cache, ss); } sm->sm_space = 0; } @@ -432,7 +449,7 @@ space_map_sync(space_map_t *sm, uint8_t maptype, spa_t *spa = dmu_objset_spa(os); void *cookie = NULL; space_seg_t *ss; - uint64_t bufsize, start, size, run_len; + uint64_t bufsize, start, size, run_len, delta, sm_space; uint64_t *entry, *entry_map, *entry_map_end; ASSERT(MUTEX_HELD(sm->sm_lock)); @@ -461,11 +478,13 @@ space_map_sync(space_map_t *sm, uint8_t maptype, SM_DEBUG_SYNCPASS_ENCODE(spa_sync_pass(spa)) | SM_DEBUG_TXG_ENCODE(dmu_tx_get_txg(tx)); + delta = 0; + sm_space = sm->sm_space; while ((ss = avl_destroy_nodes(&sm->sm_root, &cookie)) != NULL) { size = ss->ss_end - ss->ss_start; start = (ss->ss_start - sm->sm_start) >> sm->sm_shift; - sm->sm_space -= size; + delta += size; size >>= sm->sm_shift; while (size) { @@ -487,7 +506,7 @@ space_map_sync(space_map_t *sm, uint8_t maptype, start += run_len; size -= run_len; } - kmem_free(ss, sizeof (*ss)); + kmem_cache_free(space_seg_cache, ss); } if (entry != entry_map) { @@ -499,8 +518,15 @@ space_map_sync(space_map_t *sm, uint8_t maptype, smo->smo_objsize += size; } + /* + * Ensure that the space_map's accounting wasn't changed + * while we were in the middle of writing it out. + */ + VERIFY3U(sm->sm_space, ==, sm_space); + zio_buf_free(entry_map, bufsize); + sm->sm_space -= delta; VERIFY0(sm->sm_space); } |