4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2017 by Delphix. All rights reserved.
24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
26 * Copyright (c) 2016, Nexenta Systems, Inc. All rights reserved.
27 * Copyright (c) 2015 by Chunwei Chen. All rights reserved.
31 #include <sys/dmu_impl.h>
32 #include <sys/dmu_tx.h>
34 #include <sys/dnode.h>
35 #include <sys/zfs_context.h>
36 #include <sys/dmu_objset.h>
37 #include <sys/dmu_traverse.h>
38 #include <sys/dsl_dataset.h>
39 #include <sys/dsl_dir.h>
40 #include <sys/dsl_pool.h>
41 #include <sys/dsl_synctask.h>
42 #include <sys/dsl_prop.h>
43 #include <sys/dmu_zfetch.h>
44 #include <sys/zfs_ioctl.h>
46 #include <sys/zio_checksum.h>
47 #include <sys/zio_compress.h>
49 #include <sys/zfeature.h>
51 #include <sys/trace_dmu.h>
52 #include <sys/zfs_rlock.h>
54 #include <sys/vmsystm.h>
55 #include <sys/zfs_znode.h>
59 * Enable/disable nopwrite feature.
61 int zfs_nopwrite_enabled = 1;
64 * Tunable to control percentage of dirtied blocks from frees in one TXG.
65 * After this threshold is crossed, additional dirty blocks from frees
66 * wait until the next TXG.
67 * A value of zero will disable this throttle.
69 unsigned long zfs_per_txg_dirty_frees_percent = 30;
72 * Enable/disable forcing txg sync when dirty in dmu_offset_next.
74 int zfs_dmu_offset_next_sync = 0;
76 const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES] = {
77 { DMU_BSWAP_UINT8, TRUE, FALSE, "unallocated" },
78 { DMU_BSWAP_ZAP, TRUE, FALSE, "object directory" },
79 { DMU_BSWAP_UINT64, TRUE, FALSE, "object array" },
80 { DMU_BSWAP_UINT8, TRUE, FALSE, "packed nvlist" },
81 { DMU_BSWAP_UINT64, TRUE, FALSE, "packed nvlist size" },
82 { DMU_BSWAP_UINT64, TRUE, FALSE, "bpobj" },
83 { DMU_BSWAP_UINT64, TRUE, FALSE, "bpobj header" },
84 { DMU_BSWAP_UINT64, TRUE, FALSE, "SPA space map header" },
85 { DMU_BSWAP_UINT64, TRUE, FALSE, "SPA space map" },
86 { DMU_BSWAP_UINT64, TRUE, TRUE, "ZIL intent log" },
87 { DMU_BSWAP_DNODE, TRUE, TRUE, "DMU dnode" },
88 { DMU_BSWAP_OBJSET, TRUE, FALSE, "DMU objset" },
89 { DMU_BSWAP_UINT64, TRUE, FALSE, "DSL directory" },
90 { DMU_BSWAP_ZAP, TRUE, FALSE, "DSL directory child map"},
91 { DMU_BSWAP_ZAP, TRUE, FALSE, "DSL dataset snap map" },
92 { DMU_BSWAP_ZAP, TRUE, FALSE, "DSL props" },
93 { DMU_BSWAP_UINT64, TRUE, FALSE, "DSL dataset" },
94 { DMU_BSWAP_ZNODE, TRUE, FALSE, "ZFS znode" },
95 { DMU_BSWAP_OLDACL, TRUE, TRUE, "ZFS V0 ACL" },
96 { DMU_BSWAP_UINT8, FALSE, TRUE, "ZFS plain file" },
97 { DMU_BSWAP_ZAP, TRUE, TRUE, "ZFS directory" },
98 { DMU_BSWAP_ZAP, TRUE, FALSE, "ZFS master node" },
99 { DMU_BSWAP_ZAP, TRUE, TRUE, "ZFS delete queue" },
100 { DMU_BSWAP_UINT8, FALSE, TRUE, "zvol object" },
101 { DMU_BSWAP_ZAP, TRUE, FALSE, "zvol prop" },
102 { DMU_BSWAP_UINT8, FALSE, TRUE, "other uint8[]" },
103 { DMU_BSWAP_UINT64, FALSE, TRUE, "other uint64[]" },
104 { DMU_BSWAP_ZAP, TRUE, FALSE, "other ZAP" },
105 { DMU_BSWAP_ZAP, TRUE, FALSE, "persistent error log" },
106 { DMU_BSWAP_UINT8, TRUE, FALSE, "SPA history" },
107 { DMU_BSWAP_UINT64, TRUE, FALSE, "SPA history offsets" },
108 { DMU_BSWAP_ZAP, TRUE, FALSE, "Pool properties" },
109 { DMU_BSWAP_ZAP, TRUE, FALSE, "DSL permissions" },
110 { DMU_BSWAP_ACL, TRUE, TRUE, "ZFS ACL" },
111 { DMU_BSWAP_UINT8, TRUE, TRUE, "ZFS SYSACL" },
112 { DMU_BSWAP_UINT8, TRUE, TRUE, "FUID table" },
113 { DMU_BSWAP_UINT64, TRUE, FALSE, "FUID table size" },
114 { DMU_BSWAP_ZAP, TRUE, FALSE, "DSL dataset next clones"},
115 { DMU_BSWAP_ZAP, TRUE, FALSE, "scan work queue" },
116 { DMU_BSWAP_ZAP, TRUE, TRUE, "ZFS user/group/project used" },
117 { DMU_BSWAP_ZAP, TRUE, TRUE, "ZFS user/group/project quota"},
118 { DMU_BSWAP_ZAP, TRUE, FALSE, "snapshot refcount tags"},
119 { DMU_BSWAP_ZAP, TRUE, FALSE, "DDT ZAP algorithm" },
120 { DMU_BSWAP_ZAP, TRUE, FALSE, "DDT statistics" },
121 { DMU_BSWAP_UINT8, TRUE, TRUE, "System attributes" },
122 { DMU_BSWAP_ZAP, TRUE, TRUE, "SA master node" },
123 { DMU_BSWAP_ZAP, TRUE, TRUE, "SA attr registration" },
124 { DMU_BSWAP_ZAP, TRUE, TRUE, "SA attr layouts" },
125 { DMU_BSWAP_ZAP, TRUE, FALSE, "scan translations" },
126 { DMU_BSWAP_UINT8, FALSE, TRUE, "deduplicated block" },
127 { DMU_BSWAP_ZAP, TRUE, FALSE, "DSL deadlist map" },
128 { DMU_BSWAP_UINT64, TRUE, FALSE, "DSL deadlist map hdr" },
129 { DMU_BSWAP_ZAP, TRUE, FALSE, "DSL dir clones" },
130 { DMU_BSWAP_UINT64, TRUE, FALSE, "bpobj subobj" }
133 const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS] = {
134 { byteswap_uint8_array, "uint8" },
135 { byteswap_uint16_array, "uint16" },
136 { byteswap_uint32_array, "uint32" },
137 { byteswap_uint64_array, "uint64" },
138 { zap_byteswap, "zap" },
139 { dnode_buf_byteswap, "dnode" },
140 { dmu_objset_byteswap, "objset" },
141 { zfs_znode_byteswap, "znode" },
142 { zfs_oldacl_byteswap, "oldacl" },
143 { zfs_acl_byteswap, "acl" }
147 dmu_buf_hold_noread_by_dnode(dnode_t *dn, uint64_t offset,
148 void *tag, dmu_buf_t **dbp)
153 blkid = dbuf_whichblock(dn, 0, offset);
154 rw_enter(&dn->dn_struct_rwlock, RW_READER);
155 db = dbuf_hold(dn, blkid, tag);
156 rw_exit(&dn->dn_struct_rwlock);
160 return (SET_ERROR(EIO));
167 dmu_buf_hold_noread(objset_t *os, uint64_t object, uint64_t offset,
168 void *tag, dmu_buf_t **dbp)
175 err = dnode_hold(os, object, FTAG, &dn);
178 blkid = dbuf_whichblock(dn, 0, offset);
179 rw_enter(&dn->dn_struct_rwlock, RW_READER);
180 db = dbuf_hold(dn, blkid, tag);
181 rw_exit(&dn->dn_struct_rwlock);
182 dnode_rele(dn, FTAG);
186 return (SET_ERROR(EIO));
194 dmu_buf_hold_by_dnode(dnode_t *dn, uint64_t offset,
195 void *tag, dmu_buf_t **dbp, int flags)
198 int db_flags = DB_RF_CANFAIL;
200 if (flags & DMU_READ_NO_PREFETCH)
201 db_flags |= DB_RF_NOPREFETCH;
202 if (flags & DMU_READ_NO_DECRYPT)
203 db_flags |= DB_RF_NO_DECRYPT;
205 err = dmu_buf_hold_noread_by_dnode(dn, offset, tag, dbp);
207 dmu_buf_impl_t *db = (dmu_buf_impl_t *)(*dbp);
208 err = dbuf_read(db, NULL, db_flags);
219 dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset,
220 void *tag, dmu_buf_t **dbp, int flags)
223 int db_flags = DB_RF_CANFAIL;
225 if (flags & DMU_READ_NO_PREFETCH)
226 db_flags |= DB_RF_NOPREFETCH;
227 if (flags & DMU_READ_NO_DECRYPT)
228 db_flags |= DB_RF_NO_DECRYPT;
230 err = dmu_buf_hold_noread(os, object, offset, tag, dbp);
232 dmu_buf_impl_t *db = (dmu_buf_impl_t *)(*dbp);
233 err = dbuf_read(db, NULL, db_flags);
246 return (DN_OLD_MAX_BONUSLEN);
250 dmu_set_bonus(dmu_buf_t *db_fake, int newsize, dmu_tx_t *tx)
252 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
259 if (dn->dn_bonus != db) {
260 error = SET_ERROR(EINVAL);
261 } else if (newsize < 0 || newsize > db_fake->db_size) {
262 error = SET_ERROR(EINVAL);
264 dnode_setbonuslen(dn, newsize, tx);
273 dmu_set_bonustype(dmu_buf_t *db_fake, dmu_object_type_t type, dmu_tx_t *tx)
275 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
282 if (!DMU_OT_IS_VALID(type)) {
283 error = SET_ERROR(EINVAL);
284 } else if (dn->dn_bonus != db) {
285 error = SET_ERROR(EINVAL);
287 dnode_setbonus_type(dn, type, tx);
296 dmu_get_bonustype(dmu_buf_t *db_fake)
298 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
300 dmu_object_type_t type;
304 type = dn->dn_bonustype;
311 dmu_rm_spill(objset_t *os, uint64_t object, dmu_tx_t *tx)
316 error = dnode_hold(os, object, FTAG, &dn);
317 dbuf_rm_spill(dn, tx);
318 rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
319 dnode_rm_spill(dn, tx);
320 rw_exit(&dn->dn_struct_rwlock);
321 dnode_rele(dn, FTAG);
326 * returns ENOENT, EIO, or 0.
329 dmu_bonus_hold_impl(objset_t *os, uint64_t object, void *tag, uint32_t flags,
335 uint32_t db_flags = DB_RF_MUST_SUCCEED;
337 if (flags & DMU_READ_NO_PREFETCH)
338 db_flags |= DB_RF_NOPREFETCH;
339 if (flags & DMU_READ_NO_DECRYPT)
340 db_flags |= DB_RF_NO_DECRYPT;
342 error = dnode_hold(os, object, FTAG, &dn);
346 rw_enter(&dn->dn_struct_rwlock, RW_READER);
347 if (dn->dn_bonus == NULL) {
348 rw_exit(&dn->dn_struct_rwlock);
349 rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
350 if (dn->dn_bonus == NULL)
351 dbuf_create_bonus(dn);
355 /* as long as the bonus buf is held, the dnode will be held */
356 if (refcount_add(&db->db_holds, tag) == 1) {
357 VERIFY(dnode_add_ref(dn, db));
358 atomic_inc_32(&dn->dn_dbufs_count);
362 * Wait to drop dn_struct_rwlock until after adding the bonus dbuf's
363 * hold and incrementing the dbuf count to ensure that dnode_move() sees
364 * a dnode hold for every dbuf.
366 rw_exit(&dn->dn_struct_rwlock);
368 dnode_rele(dn, FTAG);
370 error = dbuf_read(db, NULL, db_flags);
372 dnode_evict_bonus(dn);
383 dmu_bonus_hold(objset_t *os, uint64_t obj, void *tag, dmu_buf_t **dbp)
385 return (dmu_bonus_hold_impl(os, obj, tag, DMU_READ_NO_PREFETCH, dbp));
389 * returns ENOENT, EIO, or 0.
391 * This interface will allocate a blank spill dbuf when a spill blk
392 * doesn't already exist on the dnode.
394 * if you only want to find an already existing spill db, then
395 * dmu_spill_hold_existing() should be used.
398 dmu_spill_hold_by_dnode(dnode_t *dn, uint32_t flags, void *tag, dmu_buf_t **dbp)
400 dmu_buf_impl_t *db = NULL;
403 if ((flags & DB_RF_HAVESTRUCT) == 0)
404 rw_enter(&dn->dn_struct_rwlock, RW_READER);
406 db = dbuf_hold(dn, DMU_SPILL_BLKID, tag);
408 if ((flags & DB_RF_HAVESTRUCT) == 0)
409 rw_exit(&dn->dn_struct_rwlock);
413 return (SET_ERROR(EIO));
415 err = dbuf_read(db, NULL, flags);
426 dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp)
428 dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus;
435 if (spa_version(dn->dn_objset->os_spa) < SPA_VERSION_SA) {
436 err = SET_ERROR(EINVAL);
438 rw_enter(&dn->dn_struct_rwlock, RW_READER);
440 if (!dn->dn_have_spill) {
441 err = SET_ERROR(ENOENT);
443 err = dmu_spill_hold_by_dnode(dn,
444 DB_RF_HAVESTRUCT | DB_RF_CANFAIL, tag, dbp);
447 rw_exit(&dn->dn_struct_rwlock);
455 dmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp)
457 dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus;
463 err = dmu_spill_hold_by_dnode(dn, DB_RF_CANFAIL, tag, dbp);
470 * Note: longer-term, we should modify all of the dmu_buf_*() interfaces
471 * to take a held dnode rather than <os, object> -- the lookup is wasteful,
472 * and can induce severe lock contention when writing to several files
473 * whose dnodes are in the same block.
476 dmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset, uint64_t length,
477 boolean_t read, void *tag, int *numbufsp, dmu_buf_t ***dbpp, uint32_t flags)
480 uint64_t blkid, nblks, i;
485 ASSERT(length <= DMU_MAX_ACCESS);
488 * Note: We directly notify the prefetch code of this read, so that
489 * we can tell it about the multi-block read. dbuf_read() only knows
490 * about the one block it is accessing.
492 dbuf_flags = DB_RF_CANFAIL | DB_RF_NEVERWAIT | DB_RF_HAVESTRUCT |
495 rw_enter(&dn->dn_struct_rwlock, RW_READER);
496 if (dn->dn_datablkshift) {
497 int blkshift = dn->dn_datablkshift;
498 nblks = (P2ROUNDUP(offset + length, 1ULL << blkshift) -
499 P2ALIGN(offset, 1ULL << blkshift)) >> blkshift;
501 if (offset + length > dn->dn_datablksz) {
502 zfs_panic_recover("zfs: accessing past end of object "
503 "%llx/%llx (size=%u access=%llu+%llu)",
504 (longlong_t)dn->dn_objset->
505 os_dsl_dataset->ds_object,
506 (longlong_t)dn->dn_object, dn->dn_datablksz,
507 (longlong_t)offset, (longlong_t)length);
508 rw_exit(&dn->dn_struct_rwlock);
509 return (SET_ERROR(EIO));
513 dbp = kmem_zalloc(sizeof (dmu_buf_t *) * nblks, KM_SLEEP);
515 zio = zio_root(dn->dn_objset->os_spa, NULL, NULL, ZIO_FLAG_CANFAIL);
516 blkid = dbuf_whichblock(dn, 0, offset);
517 for (i = 0; i < nblks; i++) {
518 dmu_buf_impl_t *db = dbuf_hold(dn, blkid + i, tag);
520 rw_exit(&dn->dn_struct_rwlock);
521 dmu_buf_rele_array(dbp, nblks, tag);
523 return (SET_ERROR(EIO));
526 /* initiate async i/o */
528 (void) dbuf_read(db, zio, dbuf_flags);
532 if ((flags & DMU_READ_NO_PREFETCH) == 0 &&
533 DNODE_META_IS_CACHEABLE(dn) && length <= zfetch_array_rd_sz) {
534 dmu_zfetch(&dn->dn_zfetch, blkid, nblks,
535 read && DNODE_IS_CACHEABLE(dn));
537 rw_exit(&dn->dn_struct_rwlock);
539 /* wait for async i/o */
542 dmu_buf_rele_array(dbp, nblks, tag);
546 /* wait for other io to complete */
548 for (i = 0; i < nblks; i++) {
549 dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbp[i];
550 mutex_enter(&db->db_mtx);
551 while (db->db_state == DB_READ ||
552 db->db_state == DB_FILL)
553 cv_wait(&db->db_changed, &db->db_mtx);
554 if (db->db_state == DB_UNCACHED)
555 err = SET_ERROR(EIO);
556 mutex_exit(&db->db_mtx);
558 dmu_buf_rele_array(dbp, nblks, tag);
570 dmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset,
571 uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp)
576 err = dnode_hold(os, object, FTAG, &dn);
580 err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag,
581 numbufsp, dbpp, DMU_READ_PREFETCH);
583 dnode_rele(dn, FTAG);
589 dmu_buf_hold_array_by_bonus(dmu_buf_t *db_fake, uint64_t offset,
590 uint64_t length, boolean_t read, void *tag, int *numbufsp,
593 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
599 err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag,
600 numbufsp, dbpp, DMU_READ_PREFETCH);
607 dmu_buf_rele_array(dmu_buf_t **dbp_fake, int numbufs, void *tag)
610 dmu_buf_impl_t **dbp = (dmu_buf_impl_t **)dbp_fake;
615 for (i = 0; i < numbufs; i++) {
617 dbuf_rele(dbp[i], tag);
620 kmem_free(dbp, sizeof (dmu_buf_t *) * numbufs);
624 * Issue prefetch i/os for the given blocks. If level is greater than 0, the
625 * indirect blocks prefeteched will be those that point to the blocks containing
626 * the data starting at offset, and continuing to offset + len.
628 * Note that if the indirect blocks above the blocks being prefetched are not
629 * in cache, they will be asychronously read in.
632 dmu_prefetch(objset_t *os, uint64_t object, int64_t level, uint64_t offset,
633 uint64_t len, zio_priority_t pri)
639 if (len == 0) { /* they're interested in the bonus buffer */
640 dn = DMU_META_DNODE(os);
642 if (object == 0 || object >= DN_MAX_OBJECT)
645 rw_enter(&dn->dn_struct_rwlock, RW_READER);
646 blkid = dbuf_whichblock(dn, level,
647 object * sizeof (dnode_phys_t));
648 dbuf_prefetch(dn, level, blkid, pri, 0);
649 rw_exit(&dn->dn_struct_rwlock);
654 * XXX - Note, if the dnode for the requested object is not
655 * already cached, we will do a *synchronous* read in the
656 * dnode_hold() call. The same is true for any indirects.
658 err = dnode_hold(os, object, FTAG, &dn);
662 rw_enter(&dn->dn_struct_rwlock, RW_READER);
664 * offset + len - 1 is the last byte we want to prefetch for, and offset
665 * is the first. Then dbuf_whichblk(dn, level, off + len - 1) is the
666 * last block we want to prefetch, and dbuf_whichblock(dn, level,
667 * offset) is the first. Then the number we need to prefetch is the
670 if (level > 0 || dn->dn_datablkshift != 0) {
671 nblks = dbuf_whichblock(dn, level, offset + len - 1) -
672 dbuf_whichblock(dn, level, offset) + 1;
674 nblks = (offset < dn->dn_datablksz);
678 blkid = dbuf_whichblock(dn, level, offset);
679 for (int i = 0; i < nblks; i++)
680 dbuf_prefetch(dn, level, blkid + i, pri, 0);
683 rw_exit(&dn->dn_struct_rwlock);
685 dnode_rele(dn, FTAG);
689 * Get the next "chunk" of file data to free. We traverse the file from
690 * the end so that the file gets shorter over time (if we crashes in the
691 * middle, this will leave us in a better state). We find allocated file
692 * data by simply searching the allocated level 1 indirects.
694 * On input, *start should be the first offset that does not need to be
695 * freed (e.g. "offset + length"). On return, *start will be the first
696 * offset that should be freed.
699 get_next_chunk(dnode_t *dn, uint64_t *start, uint64_t minimum)
701 uint64_t maxblks = DMU_MAX_ACCESS >> (dn->dn_indblkshift + 1);
702 /* bytes of data covered by a level-1 indirect block */
704 dn->dn_datablksz * EPB(dn->dn_indblkshift, SPA_BLKPTRSHIFT);
706 ASSERT3U(minimum, <=, *start);
708 if (*start - minimum <= iblkrange * maxblks) {
712 ASSERT(ISP2(iblkrange));
714 for (uint64_t blks = 0; *start > minimum && blks < maxblks; blks++) {
718 * dnode_next_offset(BACKWARDS) will find an allocated L1
719 * indirect block at or before the input offset. We must
720 * decrement *start so that it is at the end of the region
724 err = dnode_next_offset(dn,
725 DNODE_FIND_BACKWARDS, start, 2, 1, 0);
727 /* if there are no indirect blocks before start, we are done */
731 } else if (err != 0) {
735 /* set start to the beginning of this L1 indirect */
736 *start = P2ALIGN(*start, iblkrange);
738 if (*start < minimum)
744 * If this objset is of type OST_ZFS return true if vfs's unmounted flag is set,
745 * otherwise return false.
746 * Used below in dmu_free_long_range_impl() to enable abort when unmounting
750 dmu_objset_zfs_unmounting(objset_t *os)
753 if (dmu_objset_type(os) == DMU_OST_ZFS)
754 return (zfs_get_vfs_flag_unmounted(os));
760 dmu_free_long_range_impl(objset_t *os, dnode_t *dn, uint64_t offset,
761 uint64_t length, boolean_t raw)
763 uint64_t object_size;
765 uint64_t dirty_frees_threshold;
766 dsl_pool_t *dp = dmu_objset_pool(os);
769 return (SET_ERROR(EINVAL));
771 object_size = (dn->dn_maxblkid + 1) * dn->dn_datablksz;
772 if (offset >= object_size)
775 if (zfs_per_txg_dirty_frees_percent <= 100)
776 dirty_frees_threshold =
777 zfs_per_txg_dirty_frees_percent * zfs_dirty_data_max / 100;
779 dirty_frees_threshold = zfs_dirty_data_max / 4;
781 if (length == DMU_OBJECT_END || offset + length > object_size)
782 length = object_size - offset;
784 while (length != 0) {
785 uint64_t chunk_end, chunk_begin, chunk_len;
786 uint64_t long_free_dirty_all_txgs = 0;
789 if (dmu_objset_zfs_unmounting(dn->dn_objset))
790 return (SET_ERROR(EINTR));
792 chunk_end = chunk_begin = offset + length;
794 /* move chunk_begin backwards to the beginning of this chunk */
795 err = get_next_chunk(dn, &chunk_begin, offset);
798 ASSERT3U(chunk_begin, >=, offset);
799 ASSERT3U(chunk_begin, <=, chunk_end);
801 chunk_len = chunk_end - chunk_begin;
803 mutex_enter(&dp->dp_lock);
804 for (int t = 0; t < TXG_SIZE; t++) {
805 long_free_dirty_all_txgs +=
806 dp->dp_long_free_dirty_pertxg[t];
808 mutex_exit(&dp->dp_lock);
811 * To avoid filling up a TXG with just frees wait for
812 * the next TXG to open before freeing more chunks if
813 * we have reached the threshold of frees
815 if (dirty_frees_threshold != 0 &&
816 long_free_dirty_all_txgs >= dirty_frees_threshold) {
817 txg_wait_open(dp, 0);
821 tx = dmu_tx_create(os);
822 dmu_tx_hold_free(tx, dn->dn_object, chunk_begin, chunk_len);
825 * Mark this transaction as typically resulting in a net
826 * reduction in space used.
828 dmu_tx_mark_netfree(tx);
829 err = dmu_tx_assign(tx, TXG_WAIT);
835 mutex_enter(&dp->dp_lock);
836 dp->dp_long_free_dirty_pertxg[dmu_tx_get_txg(tx) & TXG_MASK] +=
838 mutex_exit(&dp->dp_lock);
839 DTRACE_PROBE3(free__long__range,
840 uint64_t, long_free_dirty_all_txgs, uint64_t, chunk_len,
841 uint64_t, dmu_tx_get_txg(tx));
842 dnode_free_range(dn, chunk_begin, chunk_len, tx);
844 /* if this is a raw free, mark the dirty record as such */
846 dbuf_dirty_record_t *dr = dn->dn_dbuf->db_last_dirty;
848 while (dr != NULL && dr->dr_txg > tx->tx_txg)
850 if (dr != NULL && dr->dr_txg == tx->tx_txg)
851 dr->dt.dl.dr_raw = B_TRUE;
862 dmu_free_long_range(objset_t *os, uint64_t object,
863 uint64_t offset, uint64_t length)
868 err = dnode_hold(os, object, FTAG, &dn);
871 err = dmu_free_long_range_impl(os, dn, offset, length, B_FALSE);
874 * It is important to zero out the maxblkid when freeing the entire
875 * file, so that (a) subsequent calls to dmu_free_long_range_impl()
876 * will take the fast path, and (b) dnode_reallocate() can verify
877 * that the entire file has been freed.
879 if (err == 0 && offset == 0 && length == DMU_OBJECT_END)
882 dnode_rele(dn, FTAG);
887 * This function is equivalent to dmu_free_long_range(), but also
888 * marks the new dirty record as a raw write.
891 dmu_free_long_range_raw(objset_t *os, uint64_t object,
892 uint64_t offset, uint64_t length)
897 err = dnode_hold(os, object, FTAG, &dn);
900 err = dmu_free_long_range_impl(os, dn, offset, length, B_TRUE);
903 * It is important to zero out the maxblkid when freeing the entire
904 * file, so that (a) subsequent calls to dmu_free_long_range_impl()
905 * will take the fast path, and (b) dnode_reallocate() can verify
906 * that the entire file has been freed.
908 if (err == 0 && offset == 0 && length == DMU_OBJECT_END)
911 dnode_rele(dn, FTAG);
916 dmu_free_long_object_impl(objset_t *os, uint64_t object, boolean_t raw)
921 err = dmu_free_long_range(os, object, 0, DMU_OBJECT_END);
925 tx = dmu_tx_create(os);
926 dmu_tx_hold_bonus(tx, object);
927 dmu_tx_hold_free(tx, object, 0, DMU_OBJECT_END);
928 dmu_tx_mark_netfree(tx);
929 err = dmu_tx_assign(tx, TXG_WAIT);
932 err = dmu_object_dirty_raw(os, object, tx);
934 err = dmu_object_free(os, object, tx);
945 dmu_free_long_object(objset_t *os, uint64_t object)
947 return (dmu_free_long_object_impl(os, object, B_FALSE));
951 dmu_free_long_object_raw(objset_t *os, uint64_t object)
953 return (dmu_free_long_object_impl(os, object, B_TRUE));
958 dmu_free_range(objset_t *os, uint64_t object, uint64_t offset,
959 uint64_t size, dmu_tx_t *tx)
962 int err = dnode_hold(os, object, FTAG, &dn);
965 ASSERT(offset < UINT64_MAX);
966 ASSERT(size == DMU_OBJECT_END || size <= UINT64_MAX - offset);
967 dnode_free_range(dn, offset, size, tx);
968 dnode_rele(dn, FTAG);
973 dmu_read_impl(dnode_t *dn, uint64_t offset, uint64_t size,
974 void *buf, uint32_t flags)
977 int numbufs, err = 0;
980 * Deal with odd block sizes, where there can't be data past the first
981 * block. If we ever do the tail block optimization, we will need to
982 * handle that here as well.
984 if (dn->dn_maxblkid == 0) {
985 uint64_t newsz = offset > dn->dn_datablksz ? 0 :
986 MIN(size, dn->dn_datablksz - offset);
987 bzero((char *)buf + newsz, size - newsz);
992 uint64_t mylen = MIN(size, DMU_MAX_ACCESS / 2);
996 * NB: we could do this block-at-a-time, but it's nice
997 * to be reading in parallel.
999 err = dmu_buf_hold_array_by_dnode(dn, offset, mylen,
1000 TRUE, FTAG, &numbufs, &dbp, flags);
1004 for (i = 0; i < numbufs; i++) {
1007 dmu_buf_t *db = dbp[i];
1011 bufoff = offset - db->db_offset;
1012 tocpy = MIN(db->db_size - bufoff, size);
1014 (void) memcpy(buf, (char *)db->db_data + bufoff, tocpy);
1018 buf = (char *)buf + tocpy;
1020 dmu_buf_rele_array(dbp, numbufs, FTAG);
1026 dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
1027 void *buf, uint32_t flags)
1032 err = dnode_hold(os, object, FTAG, &dn);
1036 err = dmu_read_impl(dn, offset, size, buf, flags);
1037 dnode_rele(dn, FTAG);
1042 dmu_read_by_dnode(dnode_t *dn, uint64_t offset, uint64_t size, void *buf,
1045 return (dmu_read_impl(dn, offset, size, buf, flags));
1049 dmu_write_impl(dmu_buf_t **dbp, int numbufs, uint64_t offset, uint64_t size,
1050 const void *buf, dmu_tx_t *tx)
1054 for (i = 0; i < numbufs; i++) {
1057 dmu_buf_t *db = dbp[i];
1061 bufoff = offset - db->db_offset;
1062 tocpy = MIN(db->db_size - bufoff, size);
1064 ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
1066 if (tocpy == db->db_size)
1067 dmu_buf_will_fill(db, tx);
1069 dmu_buf_will_dirty(db, tx);
1071 (void) memcpy((char *)db->db_data + bufoff, buf, tocpy);
1073 if (tocpy == db->db_size)
1074 dmu_buf_fill_done(db, tx);
1078 buf = (char *)buf + tocpy;
1083 dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
1084 const void *buf, dmu_tx_t *tx)
1092 VERIFY0(dmu_buf_hold_array(os, object, offset, size,
1093 FALSE, FTAG, &numbufs, &dbp));
1094 dmu_write_impl(dbp, numbufs, offset, size, buf, tx);
1095 dmu_buf_rele_array(dbp, numbufs, FTAG);
1099 dmu_write_by_dnode(dnode_t *dn, uint64_t offset, uint64_t size,
1100 const void *buf, dmu_tx_t *tx)
1108 VERIFY0(dmu_buf_hold_array_by_dnode(dn, offset, size,
1109 FALSE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH));
1110 dmu_write_impl(dbp, numbufs, offset, size, buf, tx);
1111 dmu_buf_rele_array(dbp, numbufs, FTAG);
1115 dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
1124 VERIFY(0 == dmu_buf_hold_array(os, object, offset, size,
1125 FALSE, FTAG, &numbufs, &dbp));
1127 for (i = 0; i < numbufs; i++) {
1128 dmu_buf_t *db = dbp[i];
1130 dmu_buf_will_not_fill(db, tx);
1132 dmu_buf_rele_array(dbp, numbufs, FTAG);
1136 dmu_write_embedded(objset_t *os, uint64_t object, uint64_t offset,
1137 void *data, uint8_t etype, uint8_t comp, int uncompressed_size,
1138 int compressed_size, int byteorder, dmu_tx_t *tx)
1142 ASSERT3U(etype, <, NUM_BP_EMBEDDED_TYPES);
1143 ASSERT3U(comp, <, ZIO_COMPRESS_FUNCTIONS);
1144 VERIFY0(dmu_buf_hold_noread(os, object, offset,
1147 dmu_buf_write_embedded(db,
1148 data, (bp_embedded_type_t)etype, (enum zio_compress)comp,
1149 uncompressed_size, compressed_size, byteorder, tx);
1151 dmu_buf_rele(db, FTAG);
1155 * DMU support for xuio
1157 kstat_t *xuio_ksp = NULL;
1159 typedef struct xuio_stats {
1160 /* loaned yet not returned arc_buf */
1161 kstat_named_t xuiostat_onloan_rbuf;
1162 kstat_named_t xuiostat_onloan_wbuf;
1163 /* whether a copy is made when loaning out a read buffer */
1164 kstat_named_t xuiostat_rbuf_copied;
1165 kstat_named_t xuiostat_rbuf_nocopy;
1166 /* whether a copy is made when assigning a write buffer */
1167 kstat_named_t xuiostat_wbuf_copied;
1168 kstat_named_t xuiostat_wbuf_nocopy;
1171 static xuio_stats_t xuio_stats = {
1172 { "onloan_read_buf", KSTAT_DATA_UINT64 },
1173 { "onloan_write_buf", KSTAT_DATA_UINT64 },
1174 { "read_buf_copied", KSTAT_DATA_UINT64 },
1175 { "read_buf_nocopy", KSTAT_DATA_UINT64 },
1176 { "write_buf_copied", KSTAT_DATA_UINT64 },
1177 { "write_buf_nocopy", KSTAT_DATA_UINT64 }
1180 #define XUIOSTAT_INCR(stat, val) \
1181 atomic_add_64(&xuio_stats.stat.value.ui64, (val))
1182 #define XUIOSTAT_BUMP(stat) XUIOSTAT_INCR(stat, 1)
1184 #ifdef HAVE_UIO_ZEROCOPY
1186 dmu_xuio_init(xuio_t *xuio, int nblk)
1189 uio_t *uio = &xuio->xu_uio;
1191 uio->uio_iovcnt = nblk;
1192 uio->uio_iov = kmem_zalloc(nblk * sizeof (iovec_t), KM_SLEEP);
1194 priv = kmem_zalloc(sizeof (dmu_xuio_t), KM_SLEEP);
1196 priv->bufs = kmem_zalloc(nblk * sizeof (arc_buf_t *), KM_SLEEP);
1197 priv->iovp = (iovec_t *)uio->uio_iov;
1198 XUIO_XUZC_PRIV(xuio) = priv;
1200 if (XUIO_XUZC_RW(xuio) == UIO_READ)
1201 XUIOSTAT_INCR(xuiostat_onloan_rbuf, nblk);
1203 XUIOSTAT_INCR(xuiostat_onloan_wbuf, nblk);
1209 dmu_xuio_fini(xuio_t *xuio)
1211 dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
1212 int nblk = priv->cnt;
1214 kmem_free(priv->iovp, nblk * sizeof (iovec_t));
1215 kmem_free(priv->bufs, nblk * sizeof (arc_buf_t *));
1216 kmem_free(priv, sizeof (dmu_xuio_t));
1218 if (XUIO_XUZC_RW(xuio) == UIO_READ)
1219 XUIOSTAT_INCR(xuiostat_onloan_rbuf, -nblk);
1221 XUIOSTAT_INCR(xuiostat_onloan_wbuf, -nblk);
1225 * Initialize iov[priv->next] and priv->bufs[priv->next] with { off, n, abuf }
1226 * and increase priv->next by 1.
1229 dmu_xuio_add(xuio_t *xuio, arc_buf_t *abuf, offset_t off, size_t n)
1232 uio_t *uio = &xuio->xu_uio;
1233 dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
1234 int i = priv->next++;
1236 ASSERT(i < priv->cnt);
1237 ASSERT(off + n <= arc_buf_lsize(abuf));
1238 iov = (iovec_t *)uio->uio_iov + i;
1239 iov->iov_base = (char *)abuf->b_data + off;
1241 priv->bufs[i] = abuf;
1246 dmu_xuio_cnt(xuio_t *xuio)
1248 dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
1253 dmu_xuio_arcbuf(xuio_t *xuio, int i)
1255 dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
1257 ASSERT(i < priv->cnt);
1258 return (priv->bufs[i]);
1262 dmu_xuio_clear(xuio_t *xuio, int i)
1264 dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
1266 ASSERT(i < priv->cnt);
1267 priv->bufs[i] = NULL;
1269 #endif /* HAVE_UIO_ZEROCOPY */
1272 xuio_stat_init(void)
1274 xuio_ksp = kstat_create("zfs", 0, "xuio_stats", "misc",
1275 KSTAT_TYPE_NAMED, sizeof (xuio_stats) / sizeof (kstat_named_t),
1276 KSTAT_FLAG_VIRTUAL);
1277 if (xuio_ksp != NULL) {
1278 xuio_ksp->ks_data = &xuio_stats;
1279 kstat_install(xuio_ksp);
1284 xuio_stat_fini(void)
1286 if (xuio_ksp != NULL) {
1287 kstat_delete(xuio_ksp);
1293 xuio_stat_wbuf_copied(void)
1295 XUIOSTAT_BUMP(xuiostat_wbuf_copied);
1299 xuio_stat_wbuf_nocopy(void)
1301 XUIOSTAT_BUMP(xuiostat_wbuf_nocopy);
1306 dmu_read_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size)
1309 int numbufs, i, err;
1310 #ifdef HAVE_UIO_ZEROCOPY
1311 xuio_t *xuio = NULL;
1315 * NB: we could do this block-at-a-time, but it's nice
1316 * to be reading in parallel.
1318 err = dmu_buf_hold_array_by_dnode(dn, uio->uio_loffset, size,
1319 TRUE, FTAG, &numbufs, &dbp, 0);
1323 for (i = 0; i < numbufs; i++) {
1326 dmu_buf_t *db = dbp[i];
1330 bufoff = uio->uio_loffset - db->db_offset;
1331 tocpy = MIN(db->db_size - bufoff, size);
1333 #ifdef HAVE_UIO_ZEROCOPY
1335 dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db;
1336 arc_buf_t *dbuf_abuf = dbi->db_buf;
1337 arc_buf_t *abuf = dbuf_loan_arcbuf(dbi);
1338 err = dmu_xuio_add(xuio, abuf, bufoff, tocpy);
1340 uio->uio_resid -= tocpy;
1341 uio->uio_loffset += tocpy;
1344 if (abuf == dbuf_abuf)
1345 XUIOSTAT_BUMP(xuiostat_rbuf_nocopy);
1347 XUIOSTAT_BUMP(xuiostat_rbuf_copied);
1350 err = uiomove((char *)db->db_data + bufoff, tocpy,
1357 dmu_buf_rele_array(dbp, numbufs, FTAG);
1363 * Read 'size' bytes into the uio buffer.
1364 * From object zdb->db_object.
1365 * Starting at offset uio->uio_loffset.
1367 * If the caller already has a dbuf in the target object
1368 * (e.g. its bonus buffer), this routine is faster than dmu_read_uio(),
1369 * because we don't have to find the dnode_t for the object.
1372 dmu_read_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size)
1374 dmu_buf_impl_t *db = (dmu_buf_impl_t *)zdb;
1383 err = dmu_read_uio_dnode(dn, uio, size);
1390 * Read 'size' bytes into the uio buffer.
1391 * From the specified object
1392 * Starting at offset uio->uio_loffset.
1395 dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size)
1403 err = dnode_hold(os, object, FTAG, &dn);
1407 err = dmu_read_uio_dnode(dn, uio, size);
1409 dnode_rele(dn, FTAG);
1415 dmu_write_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size, dmu_tx_t *tx)
1422 err = dmu_buf_hold_array_by_dnode(dn, uio->uio_loffset, size,
1423 FALSE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH);
1427 for (i = 0; i < numbufs; i++) {
1430 dmu_buf_t *db = dbp[i];
1434 bufoff = uio->uio_loffset - db->db_offset;
1435 tocpy = MIN(db->db_size - bufoff, size);
1437 ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
1439 if (tocpy == db->db_size)
1440 dmu_buf_will_fill(db, tx);
1442 dmu_buf_will_dirty(db, tx);
1445 * XXX uiomove could block forever (eg.nfs-backed
1446 * pages). There needs to be a uiolockdown() function
1447 * to lock the pages in memory, so that uiomove won't
1450 err = uiomove((char *)db->db_data + bufoff, tocpy,
1453 if (tocpy == db->db_size)
1454 dmu_buf_fill_done(db, tx);
1462 dmu_buf_rele_array(dbp, numbufs, FTAG);
1467 * Write 'size' bytes from the uio buffer.
1468 * To object zdb->db_object.
1469 * Starting at offset uio->uio_loffset.
1471 * If the caller already has a dbuf in the target object
1472 * (e.g. its bonus buffer), this routine is faster than dmu_write_uio(),
1473 * because we don't have to find the dnode_t for the object.
1476 dmu_write_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size,
1479 dmu_buf_impl_t *db = (dmu_buf_impl_t *)zdb;
1488 err = dmu_write_uio_dnode(dn, uio, size, tx);
1495 * Write 'size' bytes from the uio buffer.
1496 * To the specified object.
1497 * Starting at offset uio->uio_loffset.
1500 dmu_write_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size,
1509 err = dnode_hold(os, object, FTAG, &dn);
1513 err = dmu_write_uio_dnode(dn, uio, size, tx);
1515 dnode_rele(dn, FTAG);
1519 #endif /* _KERNEL */
1522 * Allocate a loaned anonymous arc buffer.
1525 dmu_request_arcbuf(dmu_buf_t *handle, int size)
1527 dmu_buf_impl_t *db = (dmu_buf_impl_t *)handle;
1529 return (arc_loan_buf(db->db_objset->os_spa, B_FALSE, size));
1533 * Free a loaned arc buffer.
1536 dmu_return_arcbuf(arc_buf_t *buf)
1538 arc_return_buf(buf, FTAG);
1539 arc_buf_destroy(buf, FTAG);
1543 dmu_convert_to_raw(dmu_buf_t *handle, boolean_t byteorder, const uint8_t *salt,
1544 const uint8_t *iv, const uint8_t *mac, dmu_tx_t *tx)
1546 dmu_object_type_t type;
1547 dmu_buf_impl_t *db = (dmu_buf_impl_t *)handle;
1548 uint64_t dsobj = dmu_objset_id(db->db_objset);
1550 ASSERT3P(db->db_buf, !=, NULL);
1551 ASSERT3U(dsobj, !=, 0);
1553 dmu_buf_will_change_crypt_params(handle, tx);
1556 type = DB_DNODE(db)->dn_type;
1560 * This technically violates the assumption the dmu code makes
1561 * that dnode blocks are only released in syncing context.
1563 (void) arc_release(db->db_buf, db);
1564 arc_convert_to_raw(db->db_buf, dsobj, byteorder, type, salt, iv, mac);
1568 dmu_copy_from_buf(objset_t *os, uint64_t object, uint64_t offset,
1569 dmu_buf_t *handle, dmu_tx_t *tx)
1571 dmu_buf_t *dst_handle;
1572 dmu_buf_impl_t *dstdb;
1573 dmu_buf_impl_t *srcdb = (dmu_buf_impl_t *)handle;
1576 boolean_t byteorder;
1577 uint8_t salt[ZIO_DATA_SALT_LEN];
1578 uint8_t iv[ZIO_DATA_IV_LEN];
1579 uint8_t mac[ZIO_DATA_MAC_LEN];
1581 ASSERT3P(srcdb->db_buf, !=, NULL);
1583 /* hold the db that we want to write to */
1584 VERIFY0(dmu_buf_hold(os, object, offset, FTAG, &dst_handle,
1585 DMU_READ_NO_DECRYPT));
1586 dstdb = (dmu_buf_impl_t *)dst_handle;
1587 datalen = arc_buf_size(srcdb->db_buf);
1589 /* allocated an arc buffer that matches the type of srcdb->db_buf */
1590 if (arc_is_encrypted(srcdb->db_buf)) {
1591 arc_get_raw_params(srcdb->db_buf, &byteorder, salt, iv, mac);
1592 abuf = arc_loan_raw_buf(os->os_spa, dmu_objset_id(os),
1593 byteorder, salt, iv, mac, DB_DNODE(dstdb)->dn_type,
1594 datalen, arc_buf_lsize(srcdb->db_buf),
1595 arc_get_compression(srcdb->db_buf));
1597 /* we won't get a compressed db back from dmu_buf_hold() */
1598 ASSERT3U(arc_get_compression(srcdb->db_buf),
1599 ==, ZIO_COMPRESS_OFF);
1600 abuf = arc_loan_buf(os->os_spa,
1601 DMU_OT_IS_METADATA(DB_DNODE(dstdb)->dn_type), datalen);
1604 ASSERT3U(datalen, ==, arc_buf_size(abuf));
1606 /* copy the data to the new buffer and assign it to the dstdb */
1607 bcopy(srcdb->db_buf->b_data, abuf->b_data, datalen);
1608 dbuf_assign_arcbuf(dstdb, abuf, tx);
1609 dmu_buf_rele(dst_handle, FTAG);
1613 * When possible directly assign passed loaned arc buffer to a dbuf.
1614 * If this is not possible copy the contents of passed arc buf via
1618 dmu_assign_arcbuf_by_dnode(dnode_t *dn, uint64_t offset, arc_buf_t *buf,
1622 objset_t *os = dn->dn_objset;
1623 uint64_t object = dn->dn_object;
1624 uint32_t blksz = (uint32_t)arc_buf_lsize(buf);
1627 rw_enter(&dn->dn_struct_rwlock, RW_READER);
1628 blkid = dbuf_whichblock(dn, 0, offset);
1629 VERIFY((db = dbuf_hold(dn, blkid, FTAG)) != NULL);
1630 rw_exit(&dn->dn_struct_rwlock);
1633 * We can only assign if the offset is aligned, the arc buf is the
1634 * same size as the dbuf, and the dbuf is not metadata.
1636 if (offset == db->db.db_offset && blksz == db->db.db_size) {
1637 dbuf_assign_arcbuf(db, buf, tx);
1638 dbuf_rele(db, FTAG);
1640 /* compressed bufs must always be assignable to their dbuf */
1641 ASSERT3U(arc_get_compression(buf), ==, ZIO_COMPRESS_OFF);
1642 ASSERT(!(buf->b_flags & ARC_BUF_FLAG_COMPRESSED));
1644 dbuf_rele(db, FTAG);
1645 dmu_write(os, object, offset, blksz, buf->b_data, tx);
1646 dmu_return_arcbuf(buf);
1647 XUIOSTAT_BUMP(xuiostat_wbuf_copied);
1652 dmu_assign_arcbuf_by_dbuf(dmu_buf_t *handle, uint64_t offset, arc_buf_t *buf,
1655 dmu_buf_impl_t *dbuf = (dmu_buf_impl_t *)handle;
1657 DB_DNODE_ENTER(dbuf);
1658 dmu_assign_arcbuf_by_dnode(DB_DNODE(dbuf), offset, buf, tx);
1659 DB_DNODE_EXIT(dbuf);
1663 dbuf_dirty_record_t *dsa_dr;
1664 dmu_sync_cb_t *dsa_done;
1671 dmu_sync_ready(zio_t *zio, arc_buf_t *buf, void *varg)
1673 dmu_sync_arg_t *dsa = varg;
1674 dmu_buf_t *db = dsa->dsa_zgd->zgd_db;
1675 blkptr_t *bp = zio->io_bp;
1677 if (zio->io_error == 0) {
1678 if (BP_IS_HOLE(bp)) {
1680 * A block of zeros may compress to a hole, but the
1681 * block size still needs to be known for replay.
1683 BP_SET_LSIZE(bp, db->db_size);
1684 } else if (!BP_IS_EMBEDDED(bp)) {
1685 ASSERT(BP_GET_LEVEL(bp) == 0);
1692 dmu_sync_late_arrival_ready(zio_t *zio)
1694 dmu_sync_ready(zio, NULL, zio->io_private);
1699 dmu_sync_done(zio_t *zio, arc_buf_t *buf, void *varg)
1701 dmu_sync_arg_t *dsa = varg;
1702 dbuf_dirty_record_t *dr = dsa->dsa_dr;
1703 dmu_buf_impl_t *db = dr->dr_dbuf;
1705 mutex_enter(&db->db_mtx);
1706 ASSERT(dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC);
1707 if (zio->io_error == 0) {
1708 dr->dt.dl.dr_nopwrite = !!(zio->io_flags & ZIO_FLAG_NOPWRITE);
1709 if (dr->dt.dl.dr_nopwrite) {
1710 blkptr_t *bp = zio->io_bp;
1711 blkptr_t *bp_orig = &zio->io_bp_orig;
1712 uint8_t chksum = BP_GET_CHECKSUM(bp_orig);
1714 ASSERT(BP_EQUAL(bp, bp_orig));
1715 VERIFY(BP_EQUAL(bp, db->db_blkptr));
1716 ASSERT(zio->io_prop.zp_compress != ZIO_COMPRESS_OFF);
1717 VERIFY(zio_checksum_table[chksum].ci_flags &
1718 ZCHECKSUM_FLAG_NOPWRITE);
1720 dr->dt.dl.dr_overridden_by = *zio->io_bp;
1721 dr->dt.dl.dr_override_state = DR_OVERRIDDEN;
1722 dr->dt.dl.dr_copies = zio->io_prop.zp_copies;
1725 * Old style holes are filled with all zeros, whereas
1726 * new-style holes maintain their lsize, type, level,
1727 * and birth time (see zio_write_compress). While we
1728 * need to reset the BP_SET_LSIZE() call that happened
1729 * in dmu_sync_ready for old style holes, we do *not*
1730 * want to wipe out the information contained in new
1731 * style holes. Thus, only zero out the block pointer if
1732 * it's an old style hole.
1734 if (BP_IS_HOLE(&dr->dt.dl.dr_overridden_by) &&
1735 dr->dt.dl.dr_overridden_by.blk_birth == 0)
1736 BP_ZERO(&dr->dt.dl.dr_overridden_by);
1738 dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN;
1740 cv_broadcast(&db->db_changed);
1741 mutex_exit(&db->db_mtx);
1743 dsa->dsa_done(dsa->dsa_zgd, zio->io_error);
1745 kmem_free(dsa, sizeof (*dsa));
1749 dmu_sync_late_arrival_done(zio_t *zio)
1751 blkptr_t *bp = zio->io_bp;
1752 dmu_sync_arg_t *dsa = zio->io_private;
1753 ASSERTV(blkptr_t *bp_orig = &zio->io_bp_orig);
1755 if (zio->io_error == 0 && !BP_IS_HOLE(bp)) {
1756 ASSERT(!(zio->io_flags & ZIO_FLAG_NOPWRITE));
1757 ASSERT(BP_IS_HOLE(bp_orig) || !BP_EQUAL(bp, bp_orig));
1758 ASSERT(zio->io_bp->blk_birth == zio->io_txg);
1759 ASSERT(zio->io_txg > spa_syncing_txg(zio->io_spa));
1760 zio_free(zio->io_spa, zio->io_txg, zio->io_bp);
1763 dmu_tx_commit(dsa->dsa_tx);
1765 dsa->dsa_done(dsa->dsa_zgd, zio->io_error);
1767 abd_put(zio->io_abd);
1768 kmem_free(dsa, sizeof (*dsa));
1772 dmu_sync_late_arrival(zio_t *pio, objset_t *os, dmu_sync_cb_t *done, zgd_t *zgd,
1773 zio_prop_t *zp, zbookmark_phys_t *zb)
1775 dmu_sync_arg_t *dsa;
1778 tx = dmu_tx_create(os);
1779 dmu_tx_hold_space(tx, zgd->zgd_db->db_size);
1780 if (dmu_tx_assign(tx, TXG_WAIT) != 0) {
1782 /* Make zl_get_data do txg_waited_synced() */
1783 return (SET_ERROR(EIO));
1787 * In order to prevent the zgd's lwb from being free'd prior to
1788 * dmu_sync_late_arrival_done() being called, we have to ensure
1789 * the lwb's "max txg" takes this tx's txg into account.
1791 zil_lwb_add_txg(zgd->zgd_lwb, dmu_tx_get_txg(tx));
1793 dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_SLEEP);
1795 dsa->dsa_done = done;
1800 * Since we are currently syncing this txg, it's nontrivial to
1801 * determine what BP to nopwrite against, so we disable nopwrite.
1803 * When syncing, the db_blkptr is initially the BP of the previous
1804 * txg. We can not nopwrite against it because it will be changed
1805 * (this is similar to the non-late-arrival case where the dbuf is
1806 * dirty in a future txg).
1808 * Then dbuf_write_ready() sets bp_blkptr to the location we will write.
1809 * We can not nopwrite against it because although the BP will not
1810 * (typically) be changed, the data has not yet been persisted to this
1813 * Finally, when dbuf_write_done() is called, it is theoretically
1814 * possible to always nopwrite, because the data that was written in
1815 * this txg is the same data that we are trying to write. However we
1816 * would need to check that this dbuf is not dirty in any future
1817 * txg's (as we do in the normal dmu_sync() path). For simplicity, we
1818 * don't nopwrite in this case.
1820 zp->zp_nopwrite = B_FALSE;
1822 zio_nowait(zio_write(pio, os->os_spa, dmu_tx_get_txg(tx), zgd->zgd_bp,
1823 abd_get_from_buf(zgd->zgd_db->db_data, zgd->zgd_db->db_size),
1824 zgd->zgd_db->db_size, zgd->zgd_db->db_size, zp,
1825 dmu_sync_late_arrival_ready, NULL, NULL, dmu_sync_late_arrival_done,
1826 dsa, ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL, zb));
1832 * Intent log support: sync the block associated with db to disk.
1833 * N.B. and XXX: the caller is responsible for making sure that the
1834 * data isn't changing while dmu_sync() is writing it.
1838 * EEXIST: this txg has already been synced, so there's nothing to do.
1839 * The caller should not log the write.
1841 * ENOENT: the block was dbuf_free_range()'d, so there's nothing to do.
1842 * The caller should not log the write.
1844 * EALREADY: this block is already in the process of being synced.
1845 * The caller should track its progress (somehow).
1847 * EIO: could not do the I/O.
1848 * The caller should do a txg_wait_synced().
1850 * 0: the I/O has been initiated.
1851 * The caller should log this blkptr in the done callback.
1852 * It is possible that the I/O will fail, in which case
1853 * the error will be reported to the done callback and
1854 * propagated to pio from zio_done().
1857 dmu_sync(zio_t *pio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd)
1859 dmu_buf_impl_t *db = (dmu_buf_impl_t *)zgd->zgd_db;
1860 objset_t *os = db->db_objset;
1861 dsl_dataset_t *ds = os->os_dsl_dataset;
1862 dbuf_dirty_record_t *dr;
1863 dmu_sync_arg_t *dsa;
1864 zbookmark_phys_t zb;
1868 ASSERT(pio != NULL);
1871 /* dbuf is within the locked range */
1872 ASSERT3U(db->db.db_offset, >=, zgd->zgd_rl->r_off);
1873 ASSERT3U(db->db.db_offset + db->db.db_size, <=,
1874 zgd->zgd_rl->r_off + zgd->zgd_rl->r_len);
1876 SET_BOOKMARK(&zb, ds->ds_object,
1877 db->db.db_object, db->db_level, db->db_blkid);
1881 dmu_write_policy(os, dn, db->db_level, WP_DMU_SYNC, &zp);
1885 * If we're frozen (running ziltest), we always need to generate a bp.
1887 if (txg > spa_freeze_txg(os->os_spa))
1888 return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb));
1891 * Grabbing db_mtx now provides a barrier between dbuf_sync_leaf()
1892 * and us. If we determine that this txg is not yet syncing,
1893 * but it begins to sync a moment later, that's OK because the
1894 * sync thread will block in dbuf_sync_leaf() until we drop db_mtx.
1896 mutex_enter(&db->db_mtx);
1898 if (txg <= spa_last_synced_txg(os->os_spa)) {
1900 * This txg has already synced. There's nothing to do.
1902 mutex_exit(&db->db_mtx);
1903 return (SET_ERROR(EEXIST));
1906 if (txg <= spa_syncing_txg(os->os_spa)) {
1908 * This txg is currently syncing, so we can't mess with
1909 * the dirty record anymore; just write a new log block.
1911 mutex_exit(&db->db_mtx);
1912 return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb));
1915 dr = db->db_last_dirty;
1916 while (dr && dr->dr_txg != txg)
1921 * There's no dr for this dbuf, so it must have been freed.
1922 * There's no need to log writes to freed blocks, so we're done.
1924 mutex_exit(&db->db_mtx);
1925 return (SET_ERROR(ENOENT));
1928 ASSERT(dr->dr_next == NULL || dr->dr_next->dr_txg < txg);
1930 if (db->db_blkptr != NULL) {
1932 * We need to fill in zgd_bp with the current blkptr so that
1933 * the nopwrite code can check if we're writing the same
1934 * data that's already on disk. We can only nopwrite if we
1935 * are sure that after making the copy, db_blkptr will not
1936 * change until our i/o completes. We ensure this by
1937 * holding the db_mtx, and only allowing nopwrite if the
1938 * block is not already dirty (see below). This is verified
1939 * by dmu_sync_done(), which VERIFYs that the db_blkptr has
1942 *zgd->zgd_bp = *db->db_blkptr;
1946 * Assume the on-disk data is X, the current syncing data (in
1947 * txg - 1) is Y, and the current in-memory data is Z (currently
1950 * We usually want to perform a nopwrite if X and Z are the
1951 * same. However, if Y is different (i.e. the BP is going to
1952 * change before this write takes effect), then a nopwrite will
1953 * be incorrect - we would override with X, which could have
1954 * been freed when Y was written.
1956 * (Note that this is not a concern when we are nop-writing from
1957 * syncing context, because X and Y must be identical, because
1958 * all previous txgs have been synced.)
1960 * Therefore, we disable nopwrite if the current BP could change
1961 * before this TXG. There are two ways it could change: by
1962 * being dirty (dr_next is non-NULL), or by being freed
1963 * (dnode_block_freed()). This behavior is verified by
1964 * zio_done(), which VERIFYs that the override BP is identical
1965 * to the on-disk BP.
1969 if (dr->dr_next != NULL || dnode_block_freed(dn, db->db_blkid))
1970 zp.zp_nopwrite = B_FALSE;
1973 ASSERT(dr->dr_txg == txg);
1974 if (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC ||
1975 dr->dt.dl.dr_override_state == DR_OVERRIDDEN) {
1977 * We have already issued a sync write for this buffer,
1978 * or this buffer has already been synced. It could not
1979 * have been dirtied since, or we would have cleared the state.
1981 mutex_exit(&db->db_mtx);
1982 return (SET_ERROR(EALREADY));
1985 ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN);
1986 dr->dt.dl.dr_override_state = DR_IN_DMU_SYNC;
1987 mutex_exit(&db->db_mtx);
1989 dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_SLEEP);
1991 dsa->dsa_done = done;
1995 zio_nowait(arc_write(pio, os->os_spa, txg,
1996 zgd->zgd_bp, dr->dt.dl.dr_data, DBUF_IS_L2CACHEABLE(db),
1997 &zp, dmu_sync_ready, NULL, NULL, dmu_sync_done, dsa,
1998 ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL, &zb));
2004 dmu_object_set_nlevels(objset_t *os, uint64_t object, int nlevels, dmu_tx_t *tx)
2009 err = dnode_hold(os, object, FTAG, &dn);
2012 err = dnode_set_nlevels(dn, nlevels, tx);
2013 dnode_rele(dn, FTAG);
2018 dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, int ibs,
2024 err = dnode_hold(os, object, FTAG, &dn);
2027 err = dnode_set_blksz(dn, size, ibs, tx);
2028 dnode_rele(dn, FTAG);
2033 dmu_object_set_maxblkid(objset_t *os, uint64_t object, uint64_t maxblkid,
2039 err = dnode_hold(os, object, FTAG, &dn);
2042 rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
2043 dnode_new_blkid(dn, maxblkid, tx, B_FALSE);
2044 rw_exit(&dn->dn_struct_rwlock);
2045 dnode_rele(dn, FTAG);
2050 dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum,
2056 * Send streams include each object's checksum function. This
2057 * check ensures that the receiving system can understand the
2058 * checksum function transmitted.
2060 ASSERT3U(checksum, <, ZIO_CHECKSUM_LEGACY_FUNCTIONS);
2062 VERIFY0(dnode_hold(os, object, FTAG, &dn));
2063 ASSERT3U(checksum, <, ZIO_CHECKSUM_FUNCTIONS);
2064 dn->dn_checksum = checksum;
2065 dnode_setdirty(dn, tx);
2066 dnode_rele(dn, FTAG);
2070 dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress,
2076 * Send streams include each object's compression function. This
2077 * check ensures that the receiving system can understand the
2078 * compression function transmitted.
2080 ASSERT3U(compress, <, ZIO_COMPRESS_LEGACY_FUNCTIONS);
2082 VERIFY0(dnode_hold(os, object, FTAG, &dn));
2083 dn->dn_compress = compress;
2084 dnode_setdirty(dn, tx);
2085 dnode_rele(dn, FTAG);
2089 * Dirty an object and set the dirty record's raw flag. This is used
2090 * when writing raw data to an object that will not effect the
2091 * encryption parameters, specifically during raw receives.
2094 dmu_object_dirty_raw(objset_t *os, uint64_t object, dmu_tx_t *tx)
2099 err = dnode_hold(os, object, FTAG, &dn);
2102 dmu_buf_will_change_crypt_params((dmu_buf_t *)dn->dn_dbuf, tx);
2103 dnode_rele(dn, FTAG);
2107 int zfs_mdcomp_disable = 0;
2110 * When the "redundant_metadata" property is set to "most", only indirect
2111 * blocks of this level and higher will have an additional ditto block.
2113 int zfs_redundant_metadata_most_ditto_level = 2;
2116 dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp, zio_prop_t *zp)
2118 dmu_object_type_t type = dn ? dn->dn_type : DMU_OT_OBJSET;
2119 boolean_t ismd = (level > 0 || DMU_OT_IS_METADATA(type) ||
2121 enum zio_checksum checksum = os->os_checksum;
2122 enum zio_compress compress = os->os_compress;
2123 enum zio_checksum dedup_checksum = os->os_dedup_checksum;
2124 boolean_t dedup = B_FALSE;
2125 boolean_t nopwrite = B_FALSE;
2126 boolean_t dedup_verify = os->os_dedup_verify;
2127 boolean_t encrypt = B_FALSE;
2128 int copies = os->os_copies;
2131 * We maintain different write policies for each of the following
2134 * 2. preallocated blocks (i.e. level-0 blocks of a dump device)
2135 * 3. all other level 0 blocks
2138 if (zfs_mdcomp_disable) {
2139 compress = ZIO_COMPRESS_EMPTY;
2142 * XXX -- we should design a compression algorithm
2143 * that specializes in arrays of bps.
2145 compress = zio_compress_select(os->os_spa,
2146 ZIO_COMPRESS_ON, ZIO_COMPRESS_ON);
2150 * Metadata always gets checksummed. If the data
2151 * checksum is multi-bit correctable, and it's not a
2152 * ZBT-style checksum, then it's suitable for metadata
2153 * as well. Otherwise, the metadata checksum defaults
2156 if (!(zio_checksum_table[checksum].ci_flags &
2157 ZCHECKSUM_FLAG_METADATA) ||
2158 (zio_checksum_table[checksum].ci_flags &
2159 ZCHECKSUM_FLAG_EMBEDDED))
2160 checksum = ZIO_CHECKSUM_FLETCHER_4;
2162 if (os->os_redundant_metadata == ZFS_REDUNDANT_METADATA_ALL ||
2163 (os->os_redundant_metadata ==
2164 ZFS_REDUNDANT_METADATA_MOST &&
2165 (level >= zfs_redundant_metadata_most_ditto_level ||
2166 DMU_OT_IS_METADATA(type) || (wp & WP_SPILL))))
2168 } else if (wp & WP_NOFILL) {
2172 * If we're writing preallocated blocks, we aren't actually
2173 * writing them so don't set any policy properties. These
2174 * blocks are currently only used by an external subsystem
2175 * outside of zfs (i.e. dump) and not written by the zio
2178 compress = ZIO_COMPRESS_OFF;
2179 checksum = ZIO_CHECKSUM_OFF;
2181 compress = zio_compress_select(os->os_spa, dn->dn_compress,
2184 checksum = (dedup_checksum == ZIO_CHECKSUM_OFF) ?
2185 zio_checksum_select(dn->dn_checksum, checksum) :
2189 * Determine dedup setting. If we are in dmu_sync(),
2190 * we won't actually dedup now because that's all
2191 * done in syncing context; but we do want to use the
2192 * dedup checkum. If the checksum is not strong
2193 * enough to ensure unique signatures, force
2196 if (dedup_checksum != ZIO_CHECKSUM_OFF) {
2197 dedup = (wp & WP_DMU_SYNC) ? B_FALSE : B_TRUE;
2198 if (!(zio_checksum_table[checksum].ci_flags &
2199 ZCHECKSUM_FLAG_DEDUP))
2200 dedup_verify = B_TRUE;
2204 * Enable nopwrite if we have secure enough checksum
2205 * algorithm (see comment in zio_nop_write) and
2206 * compression is enabled. We don't enable nopwrite if
2207 * dedup is enabled as the two features are mutually
2210 nopwrite = (!dedup && (zio_checksum_table[checksum].ci_flags &
2211 ZCHECKSUM_FLAG_NOPWRITE) &&
2212 compress != ZIO_COMPRESS_OFF && zfs_nopwrite_enabled);
2216 * All objects in an encrypted objset are protected from modification
2217 * via a MAC. Encrypted objects store their IV and salt in the last DVA
2218 * in the bp, so we cannot use all copies. Encrypted objects are also
2219 * not subject to nopwrite since writing the same data will still
2220 * result in a new ciphertext. Only encrypted blocks can be dedup'd
2221 * to avoid ambiguity in the dedup code since the DDT does not store
2224 if (os->os_encrypted && (wp & WP_NOFILL) == 0) {
2227 if (DMU_OT_IS_ENCRYPTED(type)) {
2228 copies = MIN(copies, SPA_DVAS_PER_BP - 1);
2235 (type == DMU_OT_DNODE || type == DMU_OT_OBJSET)) {
2236 compress = ZIO_COMPRESS_EMPTY;
2240 zp->zp_compress = compress;
2241 zp->zp_checksum = checksum;
2242 zp->zp_type = (wp & WP_SPILL) ? dn->dn_bonustype : type;
2243 zp->zp_level = level;
2244 zp->zp_copies = MIN(copies, spa_max_replication(os->os_spa));
2245 zp->zp_dedup = dedup;
2246 zp->zp_dedup_verify = dedup && dedup_verify;
2247 zp->zp_nopwrite = nopwrite;
2248 zp->zp_encrypt = encrypt;
2249 zp->zp_byteorder = ZFS_HOST_BYTEORDER;
2250 bzero(zp->zp_salt, ZIO_DATA_SALT_LEN);
2251 bzero(zp->zp_iv, ZIO_DATA_IV_LEN);
2252 bzero(zp->zp_mac, ZIO_DATA_MAC_LEN);
2254 ASSERT3U(zp->zp_compress, !=, ZIO_COMPRESS_INHERIT);
2258 * This function is only called from zfs_holey_common() for zpl_llseek()
2259 * in order to determine the location of holes. In order to accurately
2260 * report holes all dirty data must be synced to disk. This causes extremely
2261 * poor performance when seeking for holes in a dirty file. As a compromise,
2262 * only provide hole data when the dnode is clean. When a dnode is dirty
2263 * report the dnode as having no holes which is always a safe thing to do.
2266 dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, uint64_t *off)
2270 boolean_t clean = B_TRUE;
2272 err = dnode_hold(os, object, FTAG, &dn);
2277 * Check if dnode is dirty
2279 for (i = 0; i < TXG_SIZE; i++) {
2280 if (list_link_active(&dn->dn_dirty_link[i])) {
2287 * If compatibility option is on, sync any current changes before
2288 * we go trundling through the block pointers.
2290 if (!clean && zfs_dmu_offset_next_sync) {
2292 dnode_rele(dn, FTAG);
2293 txg_wait_synced(dmu_objset_pool(os), 0);
2294 err = dnode_hold(os, object, FTAG, &dn);
2300 err = dnode_next_offset(dn,
2301 (hole ? DNODE_FIND_HOLE : 0), off, 1, 1, 0);
2303 err = SET_ERROR(EBUSY);
2305 dnode_rele(dn, FTAG);
2311 __dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi)
2313 dnode_phys_t *dnp = dn->dn_phys;
2315 doi->doi_data_block_size = dn->dn_datablksz;
2316 doi->doi_metadata_block_size = dn->dn_indblkshift ?
2317 1ULL << dn->dn_indblkshift : 0;
2318 doi->doi_type = dn->dn_type;
2319 doi->doi_bonus_type = dn->dn_bonustype;
2320 doi->doi_bonus_size = dn->dn_bonuslen;
2321 doi->doi_dnodesize = dn->dn_num_slots << DNODE_SHIFT;
2322 doi->doi_indirection = dn->dn_nlevels;
2323 doi->doi_checksum = dn->dn_checksum;
2324 doi->doi_compress = dn->dn_compress;
2325 doi->doi_nblkptr = dn->dn_nblkptr;
2326 doi->doi_physical_blocks_512 = (DN_USED_BYTES(dnp) + 256) >> 9;
2327 doi->doi_max_offset = (dn->dn_maxblkid + 1) * dn->dn_datablksz;
2328 doi->doi_fill_count = 0;
2329 for (int i = 0; i < dnp->dn_nblkptr; i++)
2330 doi->doi_fill_count += BP_GET_FILL(&dnp->dn_blkptr[i]);
2334 dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi)
2336 rw_enter(&dn->dn_struct_rwlock, RW_READER);
2337 mutex_enter(&dn->dn_mtx);
2339 __dmu_object_info_from_dnode(dn, doi);
2341 mutex_exit(&dn->dn_mtx);
2342 rw_exit(&dn->dn_struct_rwlock);
2346 * Get information on a DMU object.
2347 * If doi is NULL, just indicates whether the object exists.
2350 dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi)
2353 int err = dnode_hold(os, object, FTAG, &dn);
2359 dmu_object_info_from_dnode(dn, doi);
2361 dnode_rele(dn, FTAG);
2366 * As above, but faster; can be used when you have a held dbuf in hand.
2369 dmu_object_info_from_db(dmu_buf_t *db_fake, dmu_object_info_t *doi)
2371 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
2374 dmu_object_info_from_dnode(DB_DNODE(db), doi);
2379 * Faster still when you only care about the size.
2380 * This is specifically optimized for zfs_getattr().
2383 dmu_object_size_from_db(dmu_buf_t *db_fake, uint32_t *blksize,
2384 u_longlong_t *nblk512)
2386 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
2392 *blksize = dn->dn_datablksz;
2393 /* add in number of slots used for the dnode itself */
2394 *nblk512 = ((DN_USED_BYTES(dn->dn_phys) + SPA_MINBLOCKSIZE/2) >>
2395 SPA_MINBLOCKSHIFT) + dn->dn_num_slots;
2400 dmu_object_dnsize_from_db(dmu_buf_t *db_fake, int *dnsize)
2402 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
2407 *dnsize = dn->dn_num_slots << DNODE_SHIFT;
2412 byteswap_uint64_array(void *vbuf, size_t size)
2414 uint64_t *buf = vbuf;
2415 size_t count = size >> 3;
2418 ASSERT((size & 7) == 0);
2420 for (i = 0; i < count; i++)
2421 buf[i] = BSWAP_64(buf[i]);
2425 byteswap_uint32_array(void *vbuf, size_t size)
2427 uint32_t *buf = vbuf;
2428 size_t count = size >> 2;
2431 ASSERT((size & 3) == 0);
2433 for (i = 0; i < count; i++)
2434 buf[i] = BSWAP_32(buf[i]);
2438 byteswap_uint16_array(void *vbuf, size_t size)
2440 uint16_t *buf = vbuf;
2441 size_t count = size >> 1;
2444 ASSERT((size & 1) == 0);
2446 for (i = 0; i < count; i++)
2447 buf[i] = BSWAP_16(buf[i]);
2452 byteswap_uint8_array(void *vbuf, size_t size)
2475 arc_fini(); /* arc depends on l2arc, so arc must go first */
2488 #if defined(_KERNEL) && defined(HAVE_SPL)
2489 EXPORT_SYMBOL(dmu_bonus_hold);
2490 EXPORT_SYMBOL(dmu_buf_hold_array_by_bonus);
2491 EXPORT_SYMBOL(dmu_buf_rele_array);
2492 EXPORT_SYMBOL(dmu_prefetch);
2493 EXPORT_SYMBOL(dmu_free_range);
2494 EXPORT_SYMBOL(dmu_free_long_range);
2495 EXPORT_SYMBOL(dmu_free_long_range_raw);
2496 EXPORT_SYMBOL(dmu_free_long_object);
2497 EXPORT_SYMBOL(dmu_free_long_object_raw);
2498 EXPORT_SYMBOL(dmu_read);
2499 EXPORT_SYMBOL(dmu_read_by_dnode);
2500 EXPORT_SYMBOL(dmu_write);
2501 EXPORT_SYMBOL(dmu_write_by_dnode);
2502 EXPORT_SYMBOL(dmu_prealloc);
2503 EXPORT_SYMBOL(dmu_object_info);
2504 EXPORT_SYMBOL(dmu_object_info_from_dnode);
2505 EXPORT_SYMBOL(dmu_object_info_from_db);
2506 EXPORT_SYMBOL(dmu_object_size_from_db);
2507 EXPORT_SYMBOL(dmu_object_dnsize_from_db);
2508 EXPORT_SYMBOL(dmu_object_set_nlevels);
2509 EXPORT_SYMBOL(dmu_object_set_blocksize);
2510 EXPORT_SYMBOL(dmu_object_set_maxblkid);
2511 EXPORT_SYMBOL(dmu_object_set_checksum);
2512 EXPORT_SYMBOL(dmu_object_set_compress);
2513 EXPORT_SYMBOL(dmu_write_policy);
2514 EXPORT_SYMBOL(dmu_sync);
2515 EXPORT_SYMBOL(dmu_request_arcbuf);
2516 EXPORT_SYMBOL(dmu_return_arcbuf);
2517 EXPORT_SYMBOL(dmu_assign_arcbuf_by_dnode);
2518 EXPORT_SYMBOL(dmu_assign_arcbuf_by_dbuf);
2519 EXPORT_SYMBOL(dmu_buf_hold);
2520 EXPORT_SYMBOL(dmu_ot);
2523 module_param(zfs_mdcomp_disable, int, 0644);
2524 MODULE_PARM_DESC(zfs_mdcomp_disable, "Disable meta data compression");
2526 module_param(zfs_nopwrite_enabled, int, 0644);
2527 MODULE_PARM_DESC(zfs_nopwrite_enabled, "Enable NOP writes");
2529 module_param(zfs_per_txg_dirty_frees_percent, ulong, 0644);
2530 MODULE_PARM_DESC(zfs_per_txg_dirty_frees_percent,
2531 "percentage of dirtied blocks from frees in one TXG");
2533 module_param(zfs_dmu_offset_next_sync, int, 0644);
2534 MODULE_PARM_DESC(zfs_dmu_offset_next_sync,
2535 "Enable forcing txg sync to find holes");