/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include #include #include #include #include /* * Space map routines. * NOTE: caller is responsible for all locking. */ static int space_map_seg_compare(const void *x1, const void *x2) { const space_seg_t *s1 = x1; const space_seg_t *s2 = x2; if (s1->ss_start < s2->ss_start) { if (s1->ss_end > s2->ss_start) return (0); return (-1); } if (s1->ss_start > s2->ss_start) { if (s1->ss_start < s2->ss_end) return (0); return (1); } return (0); } void space_map_create(space_map_t *sm, uint64_t start, uint64_t size, uint8_t shift, kmutex_t *lp) { bzero(sm, sizeof (*sm)); cv_init(&sm->sm_load_cv, NULL, CV_DEFAULT, NULL); avl_create(&sm->sm_root, space_map_seg_compare, sizeof (space_seg_t), offsetof(struct space_seg, ss_node)); sm->sm_start = start; sm->sm_size = size; sm->sm_shift = shift; sm->sm_lock = lp; } void space_map_destroy(space_map_t *sm) { ASSERT(!sm->sm_loaded && !sm->sm_loading); VERIFY3U(sm->sm_space, ==, 0); avl_destroy(&sm->sm_root); cv_destroy(&sm->sm_load_cv); } void space_map_add(space_map_t *sm, uint64_t start, uint64_t size) { avl_index_t where; space_seg_t ssearch, *ss_before, *ss_after, *ss; uint64_t end = start + size; int merge_before, merge_after; ASSERT(MUTEX_HELD(sm->sm_lock)); VERIFY(size != 0); VERIFY3U(start, >=, sm->sm_start); VERIFY3U(end, <=, sm->sm_start + sm->sm_size); VERIFY(sm->sm_space + size <= sm->sm_size); VERIFY(P2PHASE(start, 1ULL << sm->sm_shift) == 0); VERIFY(P2PHASE(size, 1ULL << sm->sm_shift) == 0); ssearch.ss_start = start; ssearch.ss_end = end; ss = avl_find(&sm->sm_root, &ssearch, &where); if (ss != NULL && ss->ss_start <= start && ss->ss_end >= end) { zfs_panic_recover("zfs: allocating allocated segment" "(offset=%llu size=%llu)\n", (longlong_t)start, (longlong_t)size); return; } /* Make sure we don't overlap with either of our neighbors */ VERIFY(ss == NULL); ss_before = avl_nearest(&sm->sm_root, where, AVL_BEFORE); ss_after = avl_nearest(&sm->sm_root, where, AVL_AFTER); merge_before = (ss_before != NULL && ss_before->ss_end == start); merge_after = (ss_after != NULL && ss_after->ss_start == end); if (merge_before && merge_after) { avl_remove(&sm->sm_root, ss_before); ss_after->ss_start = ss_before->ss_start; kmem_free(ss_before, sizeof (*ss_before)); } else if (merge_before) { ss_before->ss_end = end; } else if (merge_after) { ss_after->ss_start = start; } else { ss = kmem_alloc(sizeof (*ss), KM_SLEEP); ss->ss_start = start; ss->ss_end = end; avl_insert(&sm->sm_root, ss, where); } sm->sm_space += size; } void space_map_remove(space_map_t *sm, uint64_t start, uint64_t size) { avl_index_t where; space_seg_t ssearch, *ss, *newseg; uint64_t end = start + size; int left_over, right_over; ASSERT(MUTEX_HELD(sm->sm_lock)); VERIFY(size != 0); VERIFY(P2PHASE(start, 1ULL << sm->sm_shift) == 0); VERIFY(P2PHASE(size, 1ULL << sm->sm_shift) == 0); ssearch.ss_start = start; ssearch.ss_end = end; ss = avl_find(&sm->sm_root, &ssearch, &where); /* Make sure we completely overlap with someone */ if (ss == NULL) { zfs_panic_recover("zfs: freeing free segment " "(offset=%llu size=%llu)", (longlong_t)start, (longlong_t)size); return; } VERIFY3U(ss->ss_start, <=, start); VERIFY3U(ss->ss_end, >=, end); VERIFY(sm->sm_space - size <= sm->sm_size); left_over = (ss->ss_start != start); right_over = (ss->ss_end != end); if (left_over && right_over) { newseg = kmem_alloc(sizeof (*newseg), KM_SLEEP); newseg->ss_start = end; newseg->ss_end = ss->ss_end; ss->ss_end = start; avl_insert_here(&sm->sm_root, newseg, ss, AVL_AFTER); } else if (left_over) { ss->ss_end = start; } else if (right_over) { ss->ss_start = end; } else { avl_remove(&sm->sm_root, ss); kmem_free(ss, sizeof (*ss)); } sm->sm_space -= size; } int space_map_contains(space_map_t *sm, uint64_t start, uint64_t size) { avl_index_t where; space_seg_t ssearch, *ss; uint64_t end = start + size; ASSERT(MUTEX_HELD(sm->sm_lock)); VERIFY(size != 0); VERIFY(P2PHASE(start, 1ULL << sm->sm_shift) == 0); VERIFY(P2PHASE(size, 1ULL << sm->sm_shift) == 0); ssearch.ss_start = start; ssearch.ss_end = end; ss = avl_find(&sm->sm_root, &ssearch, &where); return (ss != NULL && ss->ss_start <= start && ss->ss_end >= end); } void space_map_vacate(space_map_t *sm, space_map_func_t *func, space_map_t *mdest) { space_seg_t *ss; void *cookie = NULL; ASSERT(MUTEX_HELD(sm->sm_lock)); 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)); } sm->sm_space = 0; } void space_map_walk(space_map_t *sm, space_map_func_t *func, space_map_t *mdest) { space_seg_t *ss; for (ss = avl_first(&sm->sm_root); ss; ss = AVL_NEXT(&sm->sm_root, ss)) func(mdest, ss->ss_start, ss->ss_end - ss->ss_start); } void space_map_excise(space_map_t *sm, uint64_t start, uint64_t size) { avl_tree_t *t = &sm->sm_root; avl_index_t where; space_seg_t *ss, search; uint64_t end = start + size; uint64_t rm_start, rm_end; ASSERT(MUTEX_HELD(sm->sm_lock)); search.ss_start = start; search.ss_end = start; for (;;) { ss = avl_find(t, &search, &where); if (ss == NULL) ss = avl_nearest(t, where, AVL_AFTER); if (ss == NULL || ss->ss_start >= end) break; rm_start = MAX(ss->ss_start, start); rm_end = MIN(ss->ss_end, end); space_map_remove(sm, rm_start, rm_end - rm_start); } } /* * Replace smd with the union of smd and sms. */ void space_map_union(space_map_t *smd, space_map_t *sms) { avl_tree_t *t = &sms->sm_root; space_seg_t *ss; ASSERT(MUTEX_HELD(smd->sm_lock)); /* * For each source segment, remove any intersections with the * destination, then add the source segment to the destination. */ for (ss = avl_first(t); ss != NULL; ss = AVL_NEXT(t, ss)) { space_map_excise(smd, ss->ss_start, ss->ss_end - ss->ss_start); space_map_add(smd, ss->ss_start, ss->ss_end - ss->ss_start); } } /* * Wait for any in-progress space_map_load() to complete. */ void space_map_load_wait(space_map_t *sm) { ASSERT(MUTEX_HELD(sm->sm_lock)); while (sm->sm_loading) cv_wait(&sm->sm_load_cv, sm->sm_lock); } /* * Note: space_map_load() will drop sm_lock across dmu_read() calls. * The caller must be OK with this. */ int space_map_load(space_map_t *sm, space_map_ops_t *ops, uint8_t maptype, space_map_obj_t *smo, objset_t *os) { uint64_t *entry, *entry_map, *entry_map_end; uint64_t bufsize, size, offset, end, space; uint64_t mapstart = sm->sm_start; int error = 0; ASSERT(MUTEX_HELD(sm->sm_lock)); space_map_load_wait(sm); if (sm->sm_loaded) return (0); sm->sm_loading = B_TRUE; end = smo->smo_objsize; space = smo->smo_alloc; ASSERT(sm->sm_ops == NULL); VERIFY3U(sm->sm_space, ==, 0); if (maptype == SM_FREE) { space_map_add(sm, sm->sm_start, sm->sm_size); space = sm->sm_size - space; } bufsize = 1ULL << SPACE_MAP_BLOCKSHIFT; entry_map = zio_buf_alloc(bufsize); mutex_exit(sm->sm_lock); if (end > bufsize) dmu_prefetch(os, smo->smo_object, bufsize, end - bufsize); mutex_enter(sm->sm_lock); for (offset = 0; offset < end; offset += bufsize) { size = MIN(end - offset, bufsize); VERIFY(P2PHASE(size, sizeof (uint64_t)) == 0); VERIFY(size != 0); dprintf("object=%llu offset=%llx size=%llx\n", smo->smo_object, offset, size); mutex_exit(sm->sm_lock); error = dmu_read(os, smo->smo_object, offset, size, entry_map); mutex_enter(sm->sm_lock); if (error != 0) break; entry_map_end = entry_map + (size / sizeof (uint64_t)); for (entry = entry_map; entry < entry_map_end; entry++) { uint64_t e = *entry; if (SM_DEBUG_DECODE(e)) /* Skip debug entries */ continue; (SM_TYPE_DECODE(e) == maptype ? space_map_add : space_map_remove)(sm, (SM_OFFSET_DECODE(e) << sm->sm_shift) + mapstart, SM_RUN_DECODE(e) << sm->sm_shift); } } if (error == 0) { VERIFY3U(sm->sm_space, ==, space); sm->sm_loaded = B_TRUE; sm->sm_ops = ops; if (ops != NULL) ops->smop_load(sm); } else { space_map_vacate(sm, NULL, NULL); } zio_buf_free(entry_map, bufsize); sm->sm_loading = B_FALSE; cv_broadcast(&sm->sm_load_cv); return (error); } void space_map_unload(space_map_t *sm) { ASSERT(MUTEX_HELD(sm->sm_lock)); if (sm->sm_loaded && sm->sm_ops != NULL) sm->sm_ops->smop_unload(sm); sm->sm_loaded = B_FALSE; sm->sm_ops = NULL; space_map_vacate(sm, NULL, NULL); } uint64_t space_map_alloc(space_map_t *sm, uint64_t size) { uint64_t start; start = sm->sm_ops->smop_alloc(sm, size); if (start != -1ULL) space_map_remove(sm, start, size); return (start); } void space_map_claim(space_map_t *sm, uint64_t start, uint64_t size) { sm->sm_ops->smop_claim(sm, start, size); space_map_remove(sm, start, size); } void space_map_free(space_map_t *sm, uint64_t start, uint64_t size) { space_map_add(sm, start, size); sm->sm_ops->smop_free(sm, start, size); } /* * Note: space_map_sync() will drop sm_lock across dmu_write() calls. */ void space_map_sync(space_map_t *sm, uint8_t maptype, space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx) { spa_t *spa = dmu_objset_spa(os); void *cookie = NULL; space_seg_t *ss; uint64_t bufsize, start, size, run_len; uint64_t *entry, *entry_map, *entry_map_end; ASSERT(MUTEX_HELD(sm->sm_lock)); if (sm->sm_space == 0) return; dprintf("object %4llu, txg %llu, pass %d, %c, count %lu, space %llx\n", smo->smo_object, dmu_tx_get_txg(tx), spa_sync_pass(spa), maptype == SM_ALLOC ? 'A' : 'F', avl_numnodes(&sm->sm_root), sm->sm_space); if (maptype == SM_ALLOC) smo->smo_alloc += sm->sm_space; else smo->smo_alloc -= sm->sm_space; bufsize = (8 + avl_numnodes(&sm->sm_root)) * sizeof (uint64_t); bufsize = MIN(bufsize, 1ULL << SPACE_MAP_BLOCKSHIFT); entry_map = zio_buf_alloc(bufsize); entry_map_end = entry_map + (bufsize / sizeof (uint64_t)); entry = entry_map; *entry++ = SM_DEBUG_ENCODE(1) | SM_DEBUG_ACTION_ENCODE(maptype) | SM_DEBUG_SYNCPASS_ENCODE(spa_sync_pass(spa)) | SM_DEBUG_TXG_ENCODE(dmu_tx_get_txg(tx)); 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; size >>= sm->sm_shift; while (size) { run_len = MIN(size, SM_RUN_MAX); if (entry == entry_map_end) { mutex_exit(sm->sm_lock); dmu_write(os, smo->smo_object, smo->smo_objsize, bufsize, entry_map, tx); mutex_enter(sm->sm_lock); smo->smo_objsize += bufsize; entry = entry_map; } *entry++ = SM_OFFSET_ENCODE(start) | SM_TYPE_ENCODE(maptype) | SM_RUN_ENCODE(run_len); start += run_len; size -= run_len; } kmem_free(ss, sizeof (*ss)); } if (entry != entry_map) { size = (entry - entry_map) * sizeof (uint64_t); mutex_exit(sm->sm_lock); dmu_write(os, smo->smo_object, smo->smo_objsize, size, entry_map, tx); mutex_enter(sm->sm_lock); smo->smo_objsize += size; } zio_buf_free(entry_map, bufsize); VERIFY3U(sm->sm_space, ==, 0); } void space_map_truncate(space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx) { VERIFY(dmu_free_range(os, smo->smo_object, 0, -1ULL, tx) == 0); smo->smo_objsize = 0; smo->smo_alloc = 0; }