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) 2013 by Delphix. All rights reserved.
26 /* Copyright (c) 2013 by Saso Kiselkov. All rights reserved. */
29 #include <sys/dmu_impl.h>
30 #include <sys/dmu_tx.h>
32 #include <sys/dnode.h>
33 #include <sys/zfs_context.h>
34 #include <sys/dmu_objset.h>
35 #include <sys/dmu_traverse.h>
36 #include <sys/dsl_dataset.h>
37 #include <sys/dsl_dir.h>
38 #include <sys/dsl_pool.h>
39 #include <sys/dsl_synctask.h>
40 #include <sys/dsl_prop.h>
41 #include <sys/dmu_zfetch.h>
42 #include <sys/zfs_ioctl.h>
44 #include <sys/zio_checksum.h>
45 #include <sys/zio_compress.h>
48 #include <sys/zfs_znode.h>
52 * Enable/disable nopwrite feature.
54 int zfs_nopwrite_enabled = 1;
55 SYSCTL_DECL(_vfs_zfs);
56 TUNABLE_INT("vfs.zfs.nopwrite_enabled", &zfs_nopwrite_enabled);
57 SYSCTL_INT(_vfs_zfs, OID_AUTO, nopwrite_enabled, CTLFLAG_RDTUN,
58 &zfs_nopwrite_enabled, 0, "Enable nopwrite feature");
60 const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES] = {
61 { DMU_BSWAP_UINT8, TRUE, "unallocated" },
62 { DMU_BSWAP_ZAP, TRUE, "object directory" },
63 { DMU_BSWAP_UINT64, TRUE, "object array" },
64 { DMU_BSWAP_UINT8, TRUE, "packed nvlist" },
65 { DMU_BSWAP_UINT64, TRUE, "packed nvlist size" },
66 { DMU_BSWAP_UINT64, TRUE, "bpobj" },
67 { DMU_BSWAP_UINT64, TRUE, "bpobj header" },
68 { DMU_BSWAP_UINT64, TRUE, "SPA space map header" },
69 { DMU_BSWAP_UINT64, TRUE, "SPA space map" },
70 { DMU_BSWAP_UINT64, TRUE, "ZIL intent log" },
71 { DMU_BSWAP_DNODE, TRUE, "DMU dnode" },
72 { DMU_BSWAP_OBJSET, TRUE, "DMU objset" },
73 { DMU_BSWAP_UINT64, TRUE, "DSL directory" },
74 { DMU_BSWAP_ZAP, TRUE, "DSL directory child map"},
75 { DMU_BSWAP_ZAP, TRUE, "DSL dataset snap map" },
76 { DMU_BSWAP_ZAP, TRUE, "DSL props" },
77 { DMU_BSWAP_UINT64, TRUE, "DSL dataset" },
78 { DMU_BSWAP_ZNODE, TRUE, "ZFS znode" },
79 { DMU_BSWAP_OLDACL, TRUE, "ZFS V0 ACL" },
80 { DMU_BSWAP_UINT8, FALSE, "ZFS plain file" },
81 { DMU_BSWAP_ZAP, TRUE, "ZFS directory" },
82 { DMU_BSWAP_ZAP, TRUE, "ZFS master node" },
83 { DMU_BSWAP_ZAP, TRUE, "ZFS delete queue" },
84 { DMU_BSWAP_UINT8, FALSE, "zvol object" },
85 { DMU_BSWAP_ZAP, TRUE, "zvol prop" },
86 { DMU_BSWAP_UINT8, FALSE, "other uint8[]" },
87 { DMU_BSWAP_UINT64, FALSE, "other uint64[]" },
88 { DMU_BSWAP_ZAP, TRUE, "other ZAP" },
89 { DMU_BSWAP_ZAP, TRUE, "persistent error log" },
90 { DMU_BSWAP_UINT8, TRUE, "SPA history" },
91 { DMU_BSWAP_UINT64, TRUE, "SPA history offsets" },
92 { DMU_BSWAP_ZAP, TRUE, "Pool properties" },
93 { DMU_BSWAP_ZAP, TRUE, "DSL permissions" },
94 { DMU_BSWAP_ACL, TRUE, "ZFS ACL" },
95 { DMU_BSWAP_UINT8, TRUE, "ZFS SYSACL" },
96 { DMU_BSWAP_UINT8, TRUE, "FUID table" },
97 { DMU_BSWAP_UINT64, TRUE, "FUID table size" },
98 { DMU_BSWAP_ZAP, TRUE, "DSL dataset next clones"},
99 { DMU_BSWAP_ZAP, TRUE, "scan work queue" },
100 { DMU_BSWAP_ZAP, TRUE, "ZFS user/group used" },
101 { DMU_BSWAP_ZAP, TRUE, "ZFS user/group quota" },
102 { DMU_BSWAP_ZAP, TRUE, "snapshot refcount tags"},
103 { DMU_BSWAP_ZAP, TRUE, "DDT ZAP algorithm" },
104 { DMU_BSWAP_ZAP, TRUE, "DDT statistics" },
105 { DMU_BSWAP_UINT8, TRUE, "System attributes" },
106 { DMU_BSWAP_ZAP, TRUE, "SA master node" },
107 { DMU_BSWAP_ZAP, TRUE, "SA attr registration" },
108 { DMU_BSWAP_ZAP, TRUE, "SA attr layouts" },
109 { DMU_BSWAP_ZAP, TRUE, "scan translations" },
110 { DMU_BSWAP_UINT8, FALSE, "deduplicated block" },
111 { DMU_BSWAP_ZAP, TRUE, "DSL deadlist map" },
112 { DMU_BSWAP_UINT64, TRUE, "DSL deadlist map hdr" },
113 { DMU_BSWAP_ZAP, TRUE, "DSL dir clones" },
114 { DMU_BSWAP_UINT64, TRUE, "bpobj subobj" }
117 const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS] = {
118 { byteswap_uint8_array, "uint8" },
119 { byteswap_uint16_array, "uint16" },
120 { byteswap_uint32_array, "uint32" },
121 { byteswap_uint64_array, "uint64" },
122 { zap_byteswap, "zap" },
123 { dnode_buf_byteswap, "dnode" },
124 { dmu_objset_byteswap, "objset" },
125 { zfs_znode_byteswap, "znode" },
126 { zfs_oldacl_byteswap, "oldacl" },
127 { zfs_acl_byteswap, "acl" }
131 dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset,
132 void *tag, dmu_buf_t **dbp, int flags)
138 int db_flags = DB_RF_CANFAIL;
140 if (flags & DMU_READ_NO_PREFETCH)
141 db_flags |= DB_RF_NOPREFETCH;
143 err = dnode_hold(os, object, FTAG, &dn);
146 blkid = dbuf_whichblock(dn, offset);
147 rw_enter(&dn->dn_struct_rwlock, RW_READER);
148 db = dbuf_hold(dn, blkid, tag);
149 rw_exit(&dn->dn_struct_rwlock);
151 err = SET_ERROR(EIO);
153 err = dbuf_read(db, NULL, db_flags);
160 dnode_rele(dn, FTAG);
161 *dbp = &db->db; /* NULL db plus first field offset is NULL */
168 return (DN_MAX_BONUSLEN);
172 dmu_set_bonus(dmu_buf_t *db_fake, int newsize, dmu_tx_t *tx)
174 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
181 if (dn->dn_bonus != db) {
182 error = SET_ERROR(EINVAL);
183 } else if (newsize < 0 || newsize > db_fake->db_size) {
184 error = SET_ERROR(EINVAL);
186 dnode_setbonuslen(dn, newsize, tx);
195 dmu_set_bonustype(dmu_buf_t *db_fake, dmu_object_type_t type, dmu_tx_t *tx)
197 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
204 if (!DMU_OT_IS_VALID(type)) {
205 error = SET_ERROR(EINVAL);
206 } else if (dn->dn_bonus != db) {
207 error = SET_ERROR(EINVAL);
209 dnode_setbonus_type(dn, type, tx);
218 dmu_get_bonustype(dmu_buf_t *db_fake)
220 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
222 dmu_object_type_t type;
226 type = dn->dn_bonustype;
233 dmu_rm_spill(objset_t *os, uint64_t object, dmu_tx_t *tx)
238 error = dnode_hold(os, object, FTAG, &dn);
239 dbuf_rm_spill(dn, tx);
240 rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
241 dnode_rm_spill(dn, tx);
242 rw_exit(&dn->dn_struct_rwlock);
243 dnode_rele(dn, FTAG);
248 * returns ENOENT, EIO, or 0.
251 dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **dbp)
257 error = dnode_hold(os, object, FTAG, &dn);
261 rw_enter(&dn->dn_struct_rwlock, RW_READER);
262 if (dn->dn_bonus == NULL) {
263 rw_exit(&dn->dn_struct_rwlock);
264 rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
265 if (dn->dn_bonus == NULL)
266 dbuf_create_bonus(dn);
270 /* as long as the bonus buf is held, the dnode will be held */
271 if (refcount_add(&db->db_holds, tag) == 1) {
272 VERIFY(dnode_add_ref(dn, db));
273 (void) atomic_inc_32_nv(&dn->dn_dbufs_count);
277 * Wait to drop dn_struct_rwlock until after adding the bonus dbuf's
278 * hold and incrementing the dbuf count to ensure that dnode_move() sees
279 * a dnode hold for every dbuf.
281 rw_exit(&dn->dn_struct_rwlock);
283 dnode_rele(dn, FTAG);
285 VERIFY(0 == dbuf_read(db, NULL, DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH));
292 * returns ENOENT, EIO, or 0.
294 * This interface will allocate a blank spill dbuf when a spill blk
295 * doesn't already exist on the dnode.
297 * if you only want to find an already existing spill db, then
298 * dmu_spill_hold_existing() should be used.
301 dmu_spill_hold_by_dnode(dnode_t *dn, uint32_t flags, void *tag, dmu_buf_t **dbp)
303 dmu_buf_impl_t *db = NULL;
306 if ((flags & DB_RF_HAVESTRUCT) == 0)
307 rw_enter(&dn->dn_struct_rwlock, RW_READER);
309 db = dbuf_hold(dn, DMU_SPILL_BLKID, tag);
311 if ((flags & DB_RF_HAVESTRUCT) == 0)
312 rw_exit(&dn->dn_struct_rwlock);
315 err = dbuf_read(db, NULL, flags);
324 dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp)
326 dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus;
333 if (spa_version(dn->dn_objset->os_spa) < SPA_VERSION_SA) {
334 err = SET_ERROR(EINVAL);
336 rw_enter(&dn->dn_struct_rwlock, RW_READER);
338 if (!dn->dn_have_spill) {
339 err = SET_ERROR(ENOENT);
341 err = dmu_spill_hold_by_dnode(dn,
342 DB_RF_HAVESTRUCT | DB_RF_CANFAIL, tag, dbp);
345 rw_exit(&dn->dn_struct_rwlock);
353 dmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp)
355 dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus;
361 err = dmu_spill_hold_by_dnode(dn, DB_RF_CANFAIL, tag, dbp);
368 * Note: longer-term, we should modify all of the dmu_buf_*() interfaces
369 * to take a held dnode rather than <os, object> -- the lookup is wasteful,
370 * and can induce severe lock contention when writing to several files
371 * whose dnodes are in the same block.
374 dmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset, uint64_t length,
375 int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp, uint32_t flags)
378 uint64_t blkid, nblks, i;
383 ASSERT(length <= DMU_MAX_ACCESS);
385 dbuf_flags = DB_RF_CANFAIL | DB_RF_NEVERWAIT | DB_RF_HAVESTRUCT;
386 if (flags & DMU_READ_NO_PREFETCH || length > zfetch_array_rd_sz)
387 dbuf_flags |= DB_RF_NOPREFETCH;
389 rw_enter(&dn->dn_struct_rwlock, RW_READER);
390 if (dn->dn_datablkshift) {
391 int blkshift = dn->dn_datablkshift;
392 nblks = (P2ROUNDUP(offset+length, 1ULL<<blkshift) -
393 P2ALIGN(offset, 1ULL<<blkshift)) >> blkshift;
395 if (offset + length > dn->dn_datablksz) {
396 zfs_panic_recover("zfs: accessing past end of object "
397 "%llx/%llx (size=%u access=%llu+%llu)",
398 (longlong_t)dn->dn_objset->
399 os_dsl_dataset->ds_object,
400 (longlong_t)dn->dn_object, dn->dn_datablksz,
401 (longlong_t)offset, (longlong_t)length);
402 rw_exit(&dn->dn_struct_rwlock);
403 return (SET_ERROR(EIO));
407 dbp = kmem_zalloc(sizeof (dmu_buf_t *) * nblks, KM_SLEEP);
409 zio = zio_root(dn->dn_objset->os_spa, NULL, NULL, ZIO_FLAG_CANFAIL);
410 blkid = dbuf_whichblock(dn, offset);
411 for (i = 0; i < nblks; i++) {
412 dmu_buf_impl_t *db = dbuf_hold(dn, blkid+i, tag);
414 rw_exit(&dn->dn_struct_rwlock);
415 dmu_buf_rele_array(dbp, nblks, tag);
417 return (SET_ERROR(EIO));
419 /* initiate async i/o */
421 (void) dbuf_read(db, zio, dbuf_flags);
424 curthread->td_ru.ru_oublock++;
428 rw_exit(&dn->dn_struct_rwlock);
430 /* wait for async i/o */
433 dmu_buf_rele_array(dbp, nblks, tag);
437 /* wait for other io to complete */
439 for (i = 0; i < nblks; i++) {
440 dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbp[i];
441 mutex_enter(&db->db_mtx);
442 while (db->db_state == DB_READ ||
443 db->db_state == DB_FILL)
444 cv_wait(&db->db_changed, &db->db_mtx);
445 if (db->db_state == DB_UNCACHED)
446 err = SET_ERROR(EIO);
447 mutex_exit(&db->db_mtx);
449 dmu_buf_rele_array(dbp, nblks, tag);
461 dmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset,
462 uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp)
467 err = dnode_hold(os, object, FTAG, &dn);
471 err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag,
472 numbufsp, dbpp, DMU_READ_PREFETCH);
474 dnode_rele(dn, FTAG);
480 dmu_buf_hold_array_by_bonus(dmu_buf_t *db_fake, uint64_t offset,
481 uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp)
483 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
489 err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag,
490 numbufsp, dbpp, DMU_READ_PREFETCH);
497 dmu_buf_rele_array(dmu_buf_t **dbp_fake, int numbufs, void *tag)
500 dmu_buf_impl_t **dbp = (dmu_buf_impl_t **)dbp_fake;
505 for (i = 0; i < numbufs; i++) {
507 dbuf_rele(dbp[i], tag);
510 kmem_free(dbp, sizeof (dmu_buf_t *) * numbufs);
514 * Issue prefetch i/os for the given blocks.
516 * Note: The assumption is that we *know* these blocks will be needed
517 * almost immediately. Therefore, the prefetch i/os will be issued at
518 * ZIO_PRIORITY_SYNC_READ
520 * Note: indirect blocks and other metadata will be read synchronously,
521 * causing this function to block if they are not already cached.
524 dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, uint64_t len)
530 if (zfs_prefetch_disable)
533 if (len == 0) { /* they're interested in the bonus buffer */
534 dn = DMU_META_DNODE(os);
536 if (object == 0 || object >= DN_MAX_OBJECT)
539 rw_enter(&dn->dn_struct_rwlock, RW_READER);
540 blkid = dbuf_whichblock(dn, object * sizeof (dnode_phys_t));
541 dbuf_prefetch(dn, blkid, ZIO_PRIORITY_SYNC_READ);
542 rw_exit(&dn->dn_struct_rwlock);
547 * XXX - Note, if the dnode for the requested object is not
548 * already cached, we will do a *synchronous* read in the
549 * dnode_hold() call. The same is true for any indirects.
551 err = dnode_hold(os, object, FTAG, &dn);
555 rw_enter(&dn->dn_struct_rwlock, RW_READER);
556 if (dn->dn_datablkshift) {
557 int blkshift = dn->dn_datablkshift;
558 nblks = (P2ROUNDUP(offset + len, 1 << blkshift) -
559 P2ALIGN(offset, 1 << blkshift)) >> blkshift;
561 nblks = (offset < dn->dn_datablksz);
565 blkid = dbuf_whichblock(dn, offset);
566 for (int i = 0; i < nblks; i++)
567 dbuf_prefetch(dn, blkid + i, ZIO_PRIORITY_SYNC_READ);
570 rw_exit(&dn->dn_struct_rwlock);
572 dnode_rele(dn, FTAG);
576 * Get the next "chunk" of file data to free. We traverse the file from
577 * the end so that the file gets shorter over time (if we crashes in the
578 * middle, this will leave us in a better state). We find allocated file
579 * data by simply searching the allocated level 1 indirects.
581 * On input, *start should be the first offset that does not need to be
582 * freed (e.g. "offset + length"). On return, *start will be the first
583 * offset that should be freed.
586 get_next_chunk(dnode_t *dn, uint64_t *start, uint64_t minimum)
588 uint64_t maxblks = DMU_MAX_ACCESS >> (dn->dn_indblkshift + 1);
589 /* bytes of data covered by a level-1 indirect block */
591 dn->dn_datablksz * EPB(dn->dn_indblkshift, SPA_BLKPTRSHIFT);
593 ASSERT3U(minimum, <=, *start);
595 if (*start - minimum <= iblkrange * maxblks) {
599 ASSERT(ISP2(iblkrange));
601 for (uint64_t blks = 0; *start > minimum && blks < maxblks; blks++) {
605 * dnode_next_offset(BACKWARDS) will find an allocated L1
606 * indirect block at or before the input offset. We must
607 * decrement *start so that it is at the end of the region
611 err = dnode_next_offset(dn,
612 DNODE_FIND_BACKWARDS, start, 2, 1, 0);
614 /* if there are no indirect blocks before start, we are done */
618 } else if (err != 0) {
622 /* set start to the beginning of this L1 indirect */
623 *start = P2ALIGN(*start, iblkrange);
625 if (*start < minimum)
631 dmu_free_long_range_impl(objset_t *os, dnode_t *dn, uint64_t offset,
634 uint64_t object_size = (dn->dn_maxblkid + 1) * dn->dn_datablksz;
637 if (offset >= object_size)
640 if (length == DMU_OBJECT_END || offset + length > object_size)
641 length = object_size - offset;
643 while (length != 0) {
644 uint64_t chunk_end, chunk_begin;
646 chunk_end = chunk_begin = offset + length;
648 /* move chunk_begin backwards to the beginning of this chunk */
649 err = get_next_chunk(dn, &chunk_begin, offset);
652 ASSERT3U(chunk_begin, >=, offset);
653 ASSERT3U(chunk_begin, <=, chunk_end);
655 dmu_tx_t *tx = dmu_tx_create(os);
656 dmu_tx_hold_free(tx, dn->dn_object,
657 chunk_begin, chunk_end - chunk_begin);
658 err = dmu_tx_assign(tx, TXG_WAIT);
663 dnode_free_range(dn, chunk_begin, chunk_end - chunk_begin, tx);
666 length -= chunk_end - chunk_begin;
672 dmu_free_long_range(objset_t *os, uint64_t object,
673 uint64_t offset, uint64_t length)
678 err = dnode_hold(os, object, FTAG, &dn);
681 err = dmu_free_long_range_impl(os, dn, offset, length);
684 * It is important to zero out the maxblkid when freeing the entire
685 * file, so that (a) subsequent calls to dmu_free_long_range_impl()
686 * will take the fast path, and (b) dnode_reallocate() can verify
687 * that the entire file has been freed.
689 if (offset == 0 && length == DMU_OBJECT_END)
692 dnode_rele(dn, FTAG);
697 dmu_free_long_object(objset_t *os, uint64_t object)
702 err = dmu_free_long_range(os, object, 0, DMU_OBJECT_END);
706 tx = dmu_tx_create(os);
707 dmu_tx_hold_bonus(tx, object);
708 dmu_tx_hold_free(tx, object, 0, DMU_OBJECT_END);
709 err = dmu_tx_assign(tx, TXG_WAIT);
711 err = dmu_object_free(os, object, tx);
721 dmu_free_range(objset_t *os, uint64_t object, uint64_t offset,
722 uint64_t size, dmu_tx_t *tx)
725 int err = dnode_hold(os, object, FTAG, &dn);
728 ASSERT(offset < UINT64_MAX);
729 ASSERT(size == -1ULL || size <= UINT64_MAX - offset);
730 dnode_free_range(dn, offset, size, tx);
731 dnode_rele(dn, FTAG);
736 dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
737 void *buf, uint32_t flags)
743 err = dnode_hold(os, object, FTAG, &dn);
748 * Deal with odd block sizes, where there can't be data past the first
749 * block. If we ever do the tail block optimization, we will need to
750 * handle that here as well.
752 if (dn->dn_maxblkid == 0) {
753 int newsz = offset > dn->dn_datablksz ? 0 :
754 MIN(size, dn->dn_datablksz - offset);
755 bzero((char *)buf + newsz, size - newsz);
760 uint64_t mylen = MIN(size, DMU_MAX_ACCESS / 2);
764 * NB: we could do this block-at-a-time, but it's nice
765 * to be reading in parallel.
767 err = dmu_buf_hold_array_by_dnode(dn, offset, mylen,
768 TRUE, FTAG, &numbufs, &dbp, flags);
772 for (i = 0; i < numbufs; i++) {
775 dmu_buf_t *db = dbp[i];
779 bufoff = offset - db->db_offset;
780 tocpy = (int)MIN(db->db_size - bufoff, size);
782 bcopy((char *)db->db_data + bufoff, buf, tocpy);
786 buf = (char *)buf + tocpy;
788 dmu_buf_rele_array(dbp, numbufs, FTAG);
790 dnode_rele(dn, FTAG);
795 dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
796 const void *buf, dmu_tx_t *tx)
804 VERIFY(0 == dmu_buf_hold_array(os, object, offset, size,
805 FALSE, FTAG, &numbufs, &dbp));
807 for (i = 0; i < numbufs; i++) {
810 dmu_buf_t *db = dbp[i];
814 bufoff = offset - db->db_offset;
815 tocpy = (int)MIN(db->db_size - bufoff, size);
817 ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
819 if (tocpy == db->db_size)
820 dmu_buf_will_fill(db, tx);
822 dmu_buf_will_dirty(db, tx);
824 bcopy(buf, (char *)db->db_data + bufoff, tocpy);
826 if (tocpy == db->db_size)
827 dmu_buf_fill_done(db, tx);
831 buf = (char *)buf + tocpy;
833 dmu_buf_rele_array(dbp, numbufs, FTAG);
837 dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
846 VERIFY(0 == dmu_buf_hold_array(os, object, offset, size,
847 FALSE, FTAG, &numbufs, &dbp));
849 for (i = 0; i < numbufs; i++) {
850 dmu_buf_t *db = dbp[i];
852 dmu_buf_will_not_fill(db, tx);
854 dmu_buf_rele_array(dbp, numbufs, FTAG);
858 * DMU support for xuio
860 kstat_t *xuio_ksp = NULL;
863 dmu_xuio_init(xuio_t *xuio, int nblk)
866 uio_t *uio = &xuio->xu_uio;
868 uio->uio_iovcnt = nblk;
869 uio->uio_iov = kmem_zalloc(nblk * sizeof (iovec_t), KM_SLEEP);
871 priv = kmem_zalloc(sizeof (dmu_xuio_t), KM_SLEEP);
873 priv->bufs = kmem_zalloc(nblk * sizeof (arc_buf_t *), KM_SLEEP);
874 priv->iovp = uio->uio_iov;
875 XUIO_XUZC_PRIV(xuio) = priv;
877 if (XUIO_XUZC_RW(xuio) == UIO_READ)
878 XUIOSTAT_INCR(xuiostat_onloan_rbuf, nblk);
880 XUIOSTAT_INCR(xuiostat_onloan_wbuf, nblk);
886 dmu_xuio_fini(xuio_t *xuio)
888 dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
889 int nblk = priv->cnt;
891 kmem_free(priv->iovp, nblk * sizeof (iovec_t));
892 kmem_free(priv->bufs, nblk * sizeof (arc_buf_t *));
893 kmem_free(priv, sizeof (dmu_xuio_t));
895 if (XUIO_XUZC_RW(xuio) == UIO_READ)
896 XUIOSTAT_INCR(xuiostat_onloan_rbuf, -nblk);
898 XUIOSTAT_INCR(xuiostat_onloan_wbuf, -nblk);
902 * Initialize iov[priv->next] and priv->bufs[priv->next] with { off, n, abuf }
903 * and increase priv->next by 1.
906 dmu_xuio_add(xuio_t *xuio, arc_buf_t *abuf, offset_t off, size_t n)
909 uio_t *uio = &xuio->xu_uio;
910 dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
911 int i = priv->next++;
913 ASSERT(i < priv->cnt);
914 ASSERT(off + n <= arc_buf_size(abuf));
915 iov = uio->uio_iov + i;
916 iov->iov_base = (char *)abuf->b_data + off;
918 priv->bufs[i] = abuf;
923 dmu_xuio_cnt(xuio_t *xuio)
925 dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
930 dmu_xuio_arcbuf(xuio_t *xuio, int i)
932 dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
934 ASSERT(i < priv->cnt);
935 return (priv->bufs[i]);
939 dmu_xuio_clear(xuio_t *xuio, int i)
941 dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
943 ASSERT(i < priv->cnt);
944 priv->bufs[i] = NULL;
950 xuio_ksp = kstat_create("zfs", 0, "xuio_stats", "misc",
951 KSTAT_TYPE_NAMED, sizeof (xuio_stats) / sizeof (kstat_named_t),
953 if (xuio_ksp != NULL) {
954 xuio_ksp->ks_data = &xuio_stats;
955 kstat_install(xuio_ksp);
962 if (xuio_ksp != NULL) {
963 kstat_delete(xuio_ksp);
969 xuio_stat_wbuf_copied()
971 XUIOSTAT_BUMP(xuiostat_wbuf_copied);
975 xuio_stat_wbuf_nocopy()
977 XUIOSTAT_BUMP(xuiostat_wbuf_nocopy);
982 dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size)
989 * NB: we could do this block-at-a-time, but it's nice
990 * to be reading in parallel.
992 err = dmu_buf_hold_array(os, object, uio->uio_loffset, size, TRUE, FTAG,
998 if (uio->uio_extflg == UIO_XUIO)
999 xuio = (xuio_t *)uio;
1002 for (i = 0; i < numbufs; i++) {
1005 dmu_buf_t *db = dbp[i];
1009 bufoff = uio->uio_loffset - db->db_offset;
1010 tocpy = (int)MIN(db->db_size - bufoff, size);
1013 dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db;
1014 arc_buf_t *dbuf_abuf = dbi->db_buf;
1015 arc_buf_t *abuf = dbuf_loan_arcbuf(dbi);
1016 err = dmu_xuio_add(xuio, abuf, bufoff, tocpy);
1018 uio->uio_resid -= tocpy;
1019 uio->uio_loffset += tocpy;
1022 if (abuf == dbuf_abuf)
1023 XUIOSTAT_BUMP(xuiostat_rbuf_nocopy);
1025 XUIOSTAT_BUMP(xuiostat_rbuf_copied);
1027 err = uiomove((char *)db->db_data + bufoff, tocpy,
1035 dmu_buf_rele_array(dbp, numbufs, FTAG);
1041 dmu_write_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size, dmu_tx_t *tx)
1048 err = dmu_buf_hold_array_by_dnode(dn, uio->uio_loffset, size,
1049 FALSE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH);
1053 for (i = 0; i < numbufs; i++) {
1056 dmu_buf_t *db = dbp[i];
1060 bufoff = uio->uio_loffset - db->db_offset;
1061 tocpy = (int)MIN(db->db_size - bufoff, size);
1063 ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
1065 if (tocpy == db->db_size)
1066 dmu_buf_will_fill(db, tx);
1068 dmu_buf_will_dirty(db, tx);
1071 * XXX uiomove could block forever (eg. nfs-backed
1072 * pages). There needs to be a uiolockdown() function
1073 * to lock the pages in memory, so that uiomove won't
1076 err = uiomove((char *)db->db_data + bufoff, tocpy,
1079 if (tocpy == db->db_size)
1080 dmu_buf_fill_done(db, tx);
1088 dmu_buf_rele_array(dbp, numbufs, FTAG);
1093 dmu_write_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size,
1096 dmu_buf_impl_t *db = (dmu_buf_impl_t *)zdb;
1105 err = dmu_write_uio_dnode(dn, uio, size, tx);
1112 dmu_write_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size,
1121 err = dnode_hold(os, object, FTAG, &dn);
1125 err = dmu_write_uio_dnode(dn, uio, size, tx);
1127 dnode_rele(dn, FTAG);
1134 dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
1135 page_t *pp, dmu_tx_t *tx)
1144 err = dmu_buf_hold_array(os, object, offset, size,
1145 FALSE, FTAG, &numbufs, &dbp);
1149 for (i = 0; i < numbufs; i++) {
1150 int tocpy, copied, thiscpy;
1152 dmu_buf_t *db = dbp[i];
1156 ASSERT3U(db->db_size, >=, PAGESIZE);
1158 bufoff = offset - db->db_offset;
1159 tocpy = (int)MIN(db->db_size - bufoff, size);
1161 ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
1163 if (tocpy == db->db_size)
1164 dmu_buf_will_fill(db, tx);
1166 dmu_buf_will_dirty(db, tx);
1168 for (copied = 0; copied < tocpy; copied += PAGESIZE) {
1169 ASSERT3U(pp->p_offset, ==, db->db_offset + bufoff);
1170 thiscpy = MIN(PAGESIZE, tocpy - copied);
1171 va = zfs_map_page(pp, S_READ);
1172 bcopy(va, (char *)db->db_data + bufoff, thiscpy);
1173 zfs_unmap_page(pp, va);
1178 if (tocpy == db->db_size)
1179 dmu_buf_fill_done(db, tx);
1184 dmu_buf_rele_array(dbp, numbufs, FTAG);
1191 * Allocate a loaned anonymous arc buffer.
1194 dmu_request_arcbuf(dmu_buf_t *handle, int size)
1196 dmu_buf_impl_t *db = (dmu_buf_impl_t *)handle;
1199 DB_GET_SPA(&spa, db);
1200 return (arc_loan_buf(spa, size));
1204 * Free a loaned arc buffer.
1207 dmu_return_arcbuf(arc_buf_t *buf)
1209 arc_return_buf(buf, FTAG);
1210 VERIFY(arc_buf_remove_ref(buf, FTAG));
1214 * When possible directly assign passed loaned arc buffer to a dbuf.
1215 * If this is not possible copy the contents of passed arc buf via
1219 dmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, arc_buf_t *buf,
1222 dmu_buf_impl_t *dbuf = (dmu_buf_impl_t *)handle;
1225 uint32_t blksz = (uint32_t)arc_buf_size(buf);
1228 DB_DNODE_ENTER(dbuf);
1229 dn = DB_DNODE(dbuf);
1230 rw_enter(&dn->dn_struct_rwlock, RW_READER);
1231 blkid = dbuf_whichblock(dn, offset);
1232 VERIFY((db = dbuf_hold(dn, blkid, FTAG)) != NULL);
1233 rw_exit(&dn->dn_struct_rwlock);
1234 DB_DNODE_EXIT(dbuf);
1236 if (offset == db->db.db_offset && blksz == db->db.db_size) {
1237 dbuf_assign_arcbuf(db, buf, tx);
1238 dbuf_rele(db, FTAG);
1243 DB_DNODE_ENTER(dbuf);
1244 dn = DB_DNODE(dbuf);
1246 object = dn->dn_object;
1247 DB_DNODE_EXIT(dbuf);
1249 dbuf_rele(db, FTAG);
1250 dmu_write(os, object, offset, blksz, buf->b_data, tx);
1251 dmu_return_arcbuf(buf);
1252 XUIOSTAT_BUMP(xuiostat_wbuf_copied);
1257 dbuf_dirty_record_t *dsa_dr;
1258 dmu_sync_cb_t *dsa_done;
1265 dmu_sync_ready(zio_t *zio, arc_buf_t *buf, void *varg)
1267 dmu_sync_arg_t *dsa = varg;
1268 dmu_buf_t *db = dsa->dsa_zgd->zgd_db;
1269 blkptr_t *bp = zio->io_bp;
1271 if (zio->io_error == 0) {
1272 if (BP_IS_HOLE(bp)) {
1274 * A block of zeros may compress to a hole, but the
1275 * block size still needs to be known for replay.
1277 BP_SET_LSIZE(bp, db->db_size);
1279 ASSERT(BP_GET_LEVEL(bp) == 0);
1286 dmu_sync_late_arrival_ready(zio_t *zio)
1288 dmu_sync_ready(zio, NULL, zio->io_private);
1293 dmu_sync_done(zio_t *zio, arc_buf_t *buf, void *varg)
1295 dmu_sync_arg_t *dsa = varg;
1296 dbuf_dirty_record_t *dr = dsa->dsa_dr;
1297 dmu_buf_impl_t *db = dr->dr_dbuf;
1299 mutex_enter(&db->db_mtx);
1300 ASSERT(dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC);
1301 if (zio->io_error == 0) {
1302 dr->dt.dl.dr_nopwrite = !!(zio->io_flags & ZIO_FLAG_NOPWRITE);
1303 if (dr->dt.dl.dr_nopwrite) {
1304 blkptr_t *bp = zio->io_bp;
1305 blkptr_t *bp_orig = &zio->io_bp_orig;
1306 uint8_t chksum = BP_GET_CHECKSUM(bp_orig);
1308 ASSERT(BP_EQUAL(bp, bp_orig));
1309 ASSERT(zio->io_prop.zp_compress != ZIO_COMPRESS_OFF);
1310 ASSERT(zio_checksum_table[chksum].ci_dedup);
1312 dr->dt.dl.dr_overridden_by = *zio->io_bp;
1313 dr->dt.dl.dr_override_state = DR_OVERRIDDEN;
1314 dr->dt.dl.dr_copies = zio->io_prop.zp_copies;
1315 if (BP_IS_HOLE(&dr->dt.dl.dr_overridden_by))
1316 BP_ZERO(&dr->dt.dl.dr_overridden_by);
1318 dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN;
1320 cv_broadcast(&db->db_changed);
1321 mutex_exit(&db->db_mtx);
1323 dsa->dsa_done(dsa->dsa_zgd, zio->io_error);
1325 kmem_free(dsa, sizeof (*dsa));
1329 dmu_sync_late_arrival_done(zio_t *zio)
1331 blkptr_t *bp = zio->io_bp;
1332 dmu_sync_arg_t *dsa = zio->io_private;
1333 blkptr_t *bp_orig = &zio->io_bp_orig;
1335 if (zio->io_error == 0 && !BP_IS_HOLE(bp)) {
1337 * If we didn't allocate a new block (i.e. ZIO_FLAG_NOPWRITE)
1338 * then there is nothing to do here. Otherwise, free the
1339 * newly allocated block in this txg.
1341 if (zio->io_flags & ZIO_FLAG_NOPWRITE) {
1342 ASSERT(BP_EQUAL(bp, bp_orig));
1344 ASSERT(BP_IS_HOLE(bp_orig) || !BP_EQUAL(bp, bp_orig));
1345 ASSERT(zio->io_bp->blk_birth == zio->io_txg);
1346 ASSERT(zio->io_txg > spa_syncing_txg(zio->io_spa));
1347 zio_free(zio->io_spa, zio->io_txg, zio->io_bp);
1351 dmu_tx_commit(dsa->dsa_tx);
1353 dsa->dsa_done(dsa->dsa_zgd, zio->io_error);
1355 kmem_free(dsa, sizeof (*dsa));
1359 dmu_sync_late_arrival(zio_t *pio, objset_t *os, dmu_sync_cb_t *done, zgd_t *zgd,
1360 zio_prop_t *zp, zbookmark_t *zb)
1362 dmu_sync_arg_t *dsa;
1365 tx = dmu_tx_create(os);
1366 dmu_tx_hold_space(tx, zgd->zgd_db->db_size);
1367 if (dmu_tx_assign(tx, TXG_WAIT) != 0) {
1369 /* Make zl_get_data do txg_waited_synced() */
1370 return (SET_ERROR(EIO));
1373 dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_SLEEP);
1375 dsa->dsa_done = done;
1379 zio_nowait(zio_write(pio, os->os_spa, dmu_tx_get_txg(tx), zgd->zgd_bp,
1380 zgd->zgd_db->db_data, zgd->zgd_db->db_size, zp,
1381 dmu_sync_late_arrival_ready, NULL, dmu_sync_late_arrival_done, dsa,
1382 ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL, zb));
1388 * Intent log support: sync the block associated with db to disk.
1389 * N.B. and XXX: the caller is responsible for making sure that the
1390 * data isn't changing while dmu_sync() is writing it.
1394 * EEXIST: this txg has already been synced, so there's nothing to do.
1395 * The caller should not log the write.
1397 * ENOENT: the block was dbuf_free_range()'d, so there's nothing to do.
1398 * The caller should not log the write.
1400 * EALREADY: this block is already in the process of being synced.
1401 * The caller should track its progress (somehow).
1403 * EIO: could not do the I/O.
1404 * The caller should do a txg_wait_synced().
1406 * 0: the I/O has been initiated.
1407 * The caller should log this blkptr in the done callback.
1408 * It is possible that the I/O will fail, in which case
1409 * the error will be reported to the done callback and
1410 * propagated to pio from zio_done().
1413 dmu_sync(zio_t *pio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd)
1415 blkptr_t *bp = zgd->zgd_bp;
1416 dmu_buf_impl_t *db = (dmu_buf_impl_t *)zgd->zgd_db;
1417 objset_t *os = db->db_objset;
1418 dsl_dataset_t *ds = os->os_dsl_dataset;
1419 dbuf_dirty_record_t *dr;
1420 dmu_sync_arg_t *dsa;
1425 ASSERT(pio != NULL);
1428 SET_BOOKMARK(&zb, ds->ds_object,
1429 db->db.db_object, db->db_level, db->db_blkid);
1433 dmu_write_policy(os, dn, db->db_level, WP_DMU_SYNC, &zp);
1437 * If we're frozen (running ziltest), we always need to generate a bp.
1439 if (txg > spa_freeze_txg(os->os_spa))
1440 return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb));
1443 * Grabbing db_mtx now provides a barrier between dbuf_sync_leaf()
1444 * and us. If we determine that this txg is not yet syncing,
1445 * but it begins to sync a moment later, that's OK because the
1446 * sync thread will block in dbuf_sync_leaf() until we drop db_mtx.
1448 mutex_enter(&db->db_mtx);
1450 if (txg <= spa_last_synced_txg(os->os_spa)) {
1452 * This txg has already synced. There's nothing to do.
1454 mutex_exit(&db->db_mtx);
1455 return (SET_ERROR(EEXIST));
1458 if (txg <= spa_syncing_txg(os->os_spa)) {
1460 * This txg is currently syncing, so we can't mess with
1461 * the dirty record anymore; just write a new log block.
1463 mutex_exit(&db->db_mtx);
1464 return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb));
1467 dr = db->db_last_dirty;
1468 while (dr && dr->dr_txg != txg)
1473 * There's no dr for this dbuf, so it must have been freed.
1474 * There's no need to log writes to freed blocks, so we're done.
1476 mutex_exit(&db->db_mtx);
1477 return (SET_ERROR(ENOENT));
1480 ASSERT(dr->dr_next == NULL || dr->dr_next->dr_txg < txg);
1483 * Assume the on-disk data is X, the current syncing data is Y,
1484 * and the current in-memory data is Z (currently in dmu_sync).
1485 * X and Z are identical but Y is has been modified. Normally,
1486 * when X and Z are the same we will perform a nopwrite but if Y
1487 * is different we must disable nopwrite since the resulting write
1488 * of Y to disk can free the block containing X. If we allowed a
1489 * nopwrite to occur the block pointing to Z would reference a freed
1490 * block. Since this is a rare case we simplify this by disabling
1491 * nopwrite if the current dmu_sync-ing dbuf has been modified in
1492 * a previous transaction.
1495 zp.zp_nopwrite = B_FALSE;
1497 ASSERT(dr->dr_txg == txg);
1498 if (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC ||
1499 dr->dt.dl.dr_override_state == DR_OVERRIDDEN) {
1501 * We have already issued a sync write for this buffer,
1502 * or this buffer has already been synced. It could not
1503 * have been dirtied since, or we would have cleared the state.
1505 mutex_exit(&db->db_mtx);
1506 return (SET_ERROR(EALREADY));
1509 ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN);
1510 dr->dt.dl.dr_override_state = DR_IN_DMU_SYNC;
1511 mutex_exit(&db->db_mtx);
1513 dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_SLEEP);
1515 dsa->dsa_done = done;
1519 zio_nowait(arc_write(pio, os->os_spa, txg,
1520 bp, dr->dt.dl.dr_data, DBUF_IS_L2CACHEABLE(db),
1521 DBUF_IS_L2COMPRESSIBLE(db), &zp, dmu_sync_ready,
1522 NULL, dmu_sync_done, dsa, ZIO_PRIORITY_SYNC_WRITE,
1523 ZIO_FLAG_CANFAIL, &zb));
1529 dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, int ibs,
1535 err = dnode_hold(os, object, FTAG, &dn);
1538 err = dnode_set_blksz(dn, size, ibs, tx);
1539 dnode_rele(dn, FTAG);
1544 dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum,
1549 /* XXX assumes dnode_hold will not get an i/o error */
1550 (void) dnode_hold(os, object, FTAG, &dn);
1551 ASSERT(checksum < ZIO_CHECKSUM_FUNCTIONS);
1552 dn->dn_checksum = checksum;
1553 dnode_setdirty(dn, tx);
1554 dnode_rele(dn, FTAG);
1558 dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress,
1563 /* XXX assumes dnode_hold will not get an i/o error */
1564 (void) dnode_hold(os, object, FTAG, &dn);
1565 ASSERT(compress < ZIO_COMPRESS_FUNCTIONS);
1566 dn->dn_compress = compress;
1567 dnode_setdirty(dn, tx);
1568 dnode_rele(dn, FTAG);
1571 int zfs_mdcomp_disable = 0;
1572 TUNABLE_INT("vfs.zfs.mdcomp_disable", &zfs_mdcomp_disable);
1573 SYSCTL_INT(_vfs_zfs, OID_AUTO, mdcomp_disable, CTLFLAG_RW,
1574 &zfs_mdcomp_disable, 0, "Disable metadata compression");
1577 dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp, zio_prop_t *zp)
1579 dmu_object_type_t type = dn ? dn->dn_type : DMU_OT_OBJSET;
1580 boolean_t ismd = (level > 0 || DMU_OT_IS_METADATA(type) ||
1582 enum zio_checksum checksum = os->os_checksum;
1583 enum zio_compress compress = os->os_compress;
1584 enum zio_checksum dedup_checksum = os->os_dedup_checksum;
1585 boolean_t dedup = B_FALSE;
1586 boolean_t nopwrite = B_FALSE;
1587 boolean_t dedup_verify = os->os_dedup_verify;
1588 int copies = os->os_copies;
1591 * We maintain different write policies for each of the following
1594 * 2. preallocated blocks (i.e. level-0 blocks of a dump device)
1595 * 3. all other level 0 blocks
1599 * XXX -- we should design a compression algorithm
1600 * that specializes in arrays of bps.
1602 compress = zfs_mdcomp_disable ? ZIO_COMPRESS_EMPTY :
1606 * Metadata always gets checksummed. If the data
1607 * checksum is multi-bit correctable, and it's not a
1608 * ZBT-style checksum, then it's suitable for metadata
1609 * as well. Otherwise, the metadata checksum defaults
1612 if (zio_checksum_table[checksum].ci_correctable < 1 ||
1613 zio_checksum_table[checksum].ci_eck)
1614 checksum = ZIO_CHECKSUM_FLETCHER_4;
1615 } else if (wp & WP_NOFILL) {
1619 * If we're writing preallocated blocks, we aren't actually
1620 * writing them so don't set any policy properties. These
1621 * blocks are currently only used by an external subsystem
1622 * outside of zfs (i.e. dump) and not written by the zio
1625 compress = ZIO_COMPRESS_OFF;
1626 checksum = ZIO_CHECKSUM_OFF;
1628 compress = zio_compress_select(dn->dn_compress, compress);
1630 checksum = (dedup_checksum == ZIO_CHECKSUM_OFF) ?
1631 zio_checksum_select(dn->dn_checksum, checksum) :
1635 * Determine dedup setting. If we are in dmu_sync(),
1636 * we won't actually dedup now because that's all
1637 * done in syncing context; but we do want to use the
1638 * dedup checkum. If the checksum is not strong
1639 * enough to ensure unique signatures, force
1642 if (dedup_checksum != ZIO_CHECKSUM_OFF) {
1643 dedup = (wp & WP_DMU_SYNC) ? B_FALSE : B_TRUE;
1644 if (!zio_checksum_table[checksum].ci_dedup)
1645 dedup_verify = B_TRUE;
1649 * Enable nopwrite if we have a cryptographically secure
1650 * checksum that has no known collisions (i.e. SHA-256)
1651 * and compression is enabled. We don't enable nopwrite if
1652 * dedup is enabled as the two features are mutually exclusive.
1654 nopwrite = (!dedup && zio_checksum_table[checksum].ci_dedup &&
1655 compress != ZIO_COMPRESS_OFF && zfs_nopwrite_enabled);
1658 zp->zp_checksum = checksum;
1659 zp->zp_compress = compress;
1660 zp->zp_type = (wp & WP_SPILL) ? dn->dn_bonustype : type;
1661 zp->zp_level = level;
1662 zp->zp_copies = MIN(copies + ismd, spa_max_replication(os->os_spa));
1663 zp->zp_dedup = dedup;
1664 zp->zp_dedup_verify = dedup && dedup_verify;
1665 zp->zp_nopwrite = nopwrite;
1669 dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, uint64_t *off)
1674 err = dnode_hold(os, object, FTAG, &dn);
1678 * Sync any current changes before
1679 * we go trundling through the block pointers.
1681 for (i = 0; i < TXG_SIZE; i++) {
1682 if (list_link_active(&dn->dn_dirty_link[i]))
1685 if (i != TXG_SIZE) {
1686 dnode_rele(dn, FTAG);
1687 txg_wait_synced(dmu_objset_pool(os), 0);
1688 err = dnode_hold(os, object, FTAG, &dn);
1693 err = dnode_next_offset(dn, (hole ? DNODE_FIND_HOLE : 0), off, 1, 1, 0);
1694 dnode_rele(dn, FTAG);
1700 dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi)
1704 rw_enter(&dn->dn_struct_rwlock, RW_READER);
1705 mutex_enter(&dn->dn_mtx);
1709 doi->doi_data_block_size = dn->dn_datablksz;
1710 doi->doi_metadata_block_size = dn->dn_indblkshift ?
1711 1ULL << dn->dn_indblkshift : 0;
1712 doi->doi_type = dn->dn_type;
1713 doi->doi_bonus_type = dn->dn_bonustype;
1714 doi->doi_bonus_size = dn->dn_bonuslen;
1715 doi->doi_indirection = dn->dn_nlevels;
1716 doi->doi_checksum = dn->dn_checksum;
1717 doi->doi_compress = dn->dn_compress;
1718 doi->doi_physical_blocks_512 = (DN_USED_BYTES(dnp) + 256) >> 9;
1719 doi->doi_max_offset = (dn->dn_maxblkid + 1) * dn->dn_datablksz;
1720 doi->doi_fill_count = 0;
1721 for (int i = 0; i < dnp->dn_nblkptr; i++)
1722 doi->doi_fill_count += dnp->dn_blkptr[i].blk_fill;
1724 mutex_exit(&dn->dn_mtx);
1725 rw_exit(&dn->dn_struct_rwlock);
1729 * Get information on a DMU object.
1730 * If doi is NULL, just indicates whether the object exists.
1733 dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi)
1736 int err = dnode_hold(os, object, FTAG, &dn);
1742 dmu_object_info_from_dnode(dn, doi);
1744 dnode_rele(dn, FTAG);
1749 * As above, but faster; can be used when you have a held dbuf in hand.
1752 dmu_object_info_from_db(dmu_buf_t *db_fake, dmu_object_info_t *doi)
1754 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
1757 dmu_object_info_from_dnode(DB_DNODE(db), doi);
1762 * Faster still when you only care about the size.
1763 * This is specifically optimized for zfs_getattr().
1766 dmu_object_size_from_db(dmu_buf_t *db_fake, uint32_t *blksize,
1767 u_longlong_t *nblk512)
1769 dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
1775 *blksize = dn->dn_datablksz;
1776 /* add 1 for dnode space */
1777 *nblk512 = ((DN_USED_BYTES(dn->dn_phys) + SPA_MINBLOCKSIZE/2) >>
1778 SPA_MINBLOCKSHIFT) + 1;
1783 byteswap_uint64_array(void *vbuf, size_t size)
1785 uint64_t *buf = vbuf;
1786 size_t count = size >> 3;
1789 ASSERT((size & 7) == 0);
1791 for (i = 0; i < count; i++)
1792 buf[i] = BSWAP_64(buf[i]);
1796 byteswap_uint32_array(void *vbuf, size_t size)
1798 uint32_t *buf = vbuf;
1799 size_t count = size >> 2;
1802 ASSERT((size & 3) == 0);
1804 for (i = 0; i < count; i++)
1805 buf[i] = BSWAP_32(buf[i]);
1809 byteswap_uint16_array(void *vbuf, size_t size)
1811 uint16_t *buf = vbuf;
1812 size_t count = size >> 1;
1815 ASSERT((size & 1) == 0);
1817 for (i = 0; i < count; i++)
1818 buf[i] = BSWAP_16(buf[i]);
1823 byteswap_uint8_array(void *vbuf, size_t size)
1844 arc_fini(); /* arc depends on l2arc, so arc must go first */