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 https://opensource.org/licenses/CDDL-1.0.
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, 2020 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.
28 * Copyright (c) 2019 Datto Inc.
29 * Copyright (c) 2019, Klara Inc.
30 * Copyright (c) 2019, Allan Jude
31 * Copyright (c) 2022 Hewlett Packard Enterprise Development LP.
32 * Copyright (c) 2021, 2022 by Pawel Jakub Dawidek
36 #include <sys/dmu_impl.h>
37 #include <sys/dmu_tx.h>
39 #include <sys/dnode.h>
40 #include <sys/zfs_context.h>
41 #include <sys/dmu_objset.h>
42 #include <sys/dmu_traverse.h>
43 #include <sys/dsl_dataset.h>
44 #include <sys/dsl_dir.h>
45 #include <sys/dsl_pool.h>
46 #include <sys/dsl_synctask.h>
47 #include <sys/dsl_prop.h>
48 #include <sys/dmu_zfetch.h>
49 #include <sys/zfs_ioctl.h>
51 #include <sys/zio_checksum.h>
52 #include <sys/zio_compress.h>
54 #include <sys/zfeature.h>
57 #include <sys/trace_zfs.h>
58 #include <sys/zfs_racct.h>
59 #include <sys/zfs_rlock.h>
61 #include <sys/vmsystm.h>
62 #include <sys/zfs_znode.h>
66 * Enable/disable nopwrite feature.
68 static int zfs_nopwrite_enabled
= 1;
71 * Tunable to control percentage of dirtied L1 blocks from frees allowed into
72 * one TXG. After this threshold is crossed, additional dirty blocks from frees
73 * will wait until the next TXG.
74 * A value of zero will disable this throttle.
76 static uint_t zfs_per_txg_dirty_frees_percent
= 30;
79 * Enable/disable forcing txg sync when dirty checking for holes with lseek().
80 * By default this is enabled to ensure accurate hole reporting, it can result
81 * in a significant performance penalty for lseek(SEEK_HOLE) heavy workloads.
82 * Disabling this option will result in holes never being reported in dirty
83 * files which is always safe.
85 static int zfs_dmu_offset_next_sync
= 1;
88 * Limit the amount we can prefetch with one call to this amount. This
89 * helps to limit the amount of memory that can be used by prefetching.
90 * Larger objects should be prefetched a bit at a time.
93 uint_t dmu_prefetch_max
= 8 * 1024 * 1024;
95 uint_t dmu_prefetch_max
= 8 * SPA_MAXBLOCKSIZE
;
98 const dmu_object_type_info_t dmu_ot
[DMU_OT_NUMTYPES
] = {
99 {DMU_BSWAP_UINT8
, TRUE
, FALSE
, FALSE
, "unallocated" },
100 {DMU_BSWAP_ZAP
, TRUE
, TRUE
, FALSE
, "object directory" },
101 {DMU_BSWAP_UINT64
, TRUE
, TRUE
, FALSE
, "object array" },
102 {DMU_BSWAP_UINT8
, TRUE
, FALSE
, FALSE
, "packed nvlist" },
103 {DMU_BSWAP_UINT64
, TRUE
, FALSE
, FALSE
, "packed nvlist size" },
104 {DMU_BSWAP_UINT64
, TRUE
, FALSE
, FALSE
, "bpobj" },
105 {DMU_BSWAP_UINT64
, TRUE
, FALSE
, FALSE
, "bpobj header" },
106 {DMU_BSWAP_UINT64
, TRUE
, FALSE
, FALSE
, "SPA space map header" },
107 {DMU_BSWAP_UINT64
, TRUE
, FALSE
, FALSE
, "SPA space map" },
108 {DMU_BSWAP_UINT64
, TRUE
, FALSE
, TRUE
, "ZIL intent log" },
109 {DMU_BSWAP_DNODE
, TRUE
, FALSE
, TRUE
, "DMU dnode" },
110 {DMU_BSWAP_OBJSET
, TRUE
, TRUE
, FALSE
, "DMU objset" },
111 {DMU_BSWAP_UINT64
, TRUE
, TRUE
, FALSE
, "DSL directory" },
112 {DMU_BSWAP_ZAP
, TRUE
, TRUE
, FALSE
, "DSL directory child map"},
113 {DMU_BSWAP_ZAP
, TRUE
, TRUE
, FALSE
, "DSL dataset snap map" },
114 {DMU_BSWAP_ZAP
, TRUE
, TRUE
, FALSE
, "DSL props" },
115 {DMU_BSWAP_UINT64
, TRUE
, TRUE
, FALSE
, "DSL dataset" },
116 {DMU_BSWAP_ZNODE
, TRUE
, FALSE
, FALSE
, "ZFS znode" },
117 {DMU_BSWAP_OLDACL
, TRUE
, FALSE
, TRUE
, "ZFS V0 ACL" },
118 {DMU_BSWAP_UINT8
, FALSE
, FALSE
, TRUE
, "ZFS plain file" },
119 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, TRUE
, "ZFS directory" },
120 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, FALSE
, "ZFS master node" },
121 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, TRUE
, "ZFS delete queue" },
122 {DMU_BSWAP_UINT8
, FALSE
, FALSE
, TRUE
, "zvol object" },
123 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, FALSE
, "zvol prop" },
124 {DMU_BSWAP_UINT8
, FALSE
, FALSE
, TRUE
, "other uint8[]" },
125 {DMU_BSWAP_UINT64
, FALSE
, FALSE
, TRUE
, "other uint64[]" },
126 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, FALSE
, "other ZAP" },
127 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, FALSE
, "persistent error log" },
128 {DMU_BSWAP_UINT8
, TRUE
, FALSE
, FALSE
, "SPA history" },
129 {DMU_BSWAP_UINT64
, TRUE
, FALSE
, FALSE
, "SPA history offsets" },
130 {DMU_BSWAP_ZAP
, TRUE
, TRUE
, FALSE
, "Pool properties" },
131 {DMU_BSWAP_ZAP
, TRUE
, TRUE
, FALSE
, "DSL permissions" },
132 {DMU_BSWAP_ACL
, TRUE
, FALSE
, TRUE
, "ZFS ACL" },
133 {DMU_BSWAP_UINT8
, TRUE
, FALSE
, TRUE
, "ZFS SYSACL" },
134 {DMU_BSWAP_UINT8
, TRUE
, FALSE
, TRUE
, "FUID table" },
135 {DMU_BSWAP_UINT64
, TRUE
, FALSE
, FALSE
, "FUID table size" },
136 {DMU_BSWAP_ZAP
, TRUE
, TRUE
, FALSE
, "DSL dataset next clones"},
137 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, FALSE
, "scan work queue" },
138 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, TRUE
, "ZFS user/group/project used" },
139 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, TRUE
, "ZFS user/group/project quota"},
140 {DMU_BSWAP_ZAP
, TRUE
, TRUE
, FALSE
, "snapshot refcount tags"},
141 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, FALSE
, "DDT ZAP algorithm" },
142 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, FALSE
, "DDT statistics" },
143 {DMU_BSWAP_UINT8
, TRUE
, FALSE
, TRUE
, "System attributes" },
144 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, TRUE
, "SA master node" },
145 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, TRUE
, "SA attr registration" },
146 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, TRUE
, "SA attr layouts" },
147 {DMU_BSWAP_ZAP
, TRUE
, FALSE
, FALSE
, "scan translations" },
148 {DMU_BSWAP_UINT8
, FALSE
, FALSE
, TRUE
, "deduplicated block" },
149 {DMU_BSWAP_ZAP
, TRUE
, TRUE
, FALSE
, "DSL deadlist map" },
150 {DMU_BSWAP_UINT64
, TRUE
, TRUE
, FALSE
, "DSL deadlist map hdr" },
151 {DMU_BSWAP_ZAP
, TRUE
, TRUE
, FALSE
, "DSL dir clones" },
152 {DMU_BSWAP_UINT64
, TRUE
, FALSE
, FALSE
, "bpobj subobj" }
155 dmu_object_byteswap_info_t dmu_ot_byteswap
[DMU_BSWAP_NUMFUNCS
] = {
156 { byteswap_uint8_array
, "uint8" },
157 { byteswap_uint16_array
, "uint16" },
158 { byteswap_uint32_array
, "uint32" },
159 { byteswap_uint64_array
, "uint64" },
160 { zap_byteswap
, "zap" },
161 { dnode_buf_byteswap
, "dnode" },
162 { dmu_objset_byteswap
, "objset" },
163 { zfs_znode_byteswap
, "znode" },
164 { zfs_oldacl_byteswap
, "oldacl" },
165 { zfs_acl_byteswap
, "acl" }
169 dmu_buf_hold_noread_by_dnode(dnode_t
*dn
, uint64_t offset
,
170 const void *tag
, dmu_buf_t
**dbp
)
175 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
176 blkid
= dbuf_whichblock(dn
, 0, offset
);
177 db
= dbuf_hold(dn
, blkid
, tag
);
178 rw_exit(&dn
->dn_struct_rwlock
);
182 return (SET_ERROR(EIO
));
190 dmu_buf_hold_noread(objset_t
*os
, uint64_t object
, uint64_t offset
,
191 const void *tag
, dmu_buf_t
**dbp
)
198 err
= dnode_hold(os
, object
, FTAG
, &dn
);
201 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
202 blkid
= dbuf_whichblock(dn
, 0, offset
);
203 db
= dbuf_hold(dn
, blkid
, tag
);
204 rw_exit(&dn
->dn_struct_rwlock
);
205 dnode_rele(dn
, FTAG
);
209 return (SET_ERROR(EIO
));
217 dmu_buf_hold_by_dnode(dnode_t
*dn
, uint64_t offset
,
218 const void *tag
, dmu_buf_t
**dbp
, int flags
)
221 int db_flags
= DB_RF_CANFAIL
;
223 if (flags
& DMU_READ_NO_PREFETCH
)
224 db_flags
|= DB_RF_NOPREFETCH
;
225 if (flags
& DMU_READ_NO_DECRYPT
)
226 db_flags
|= DB_RF_NO_DECRYPT
;
228 err
= dmu_buf_hold_noread_by_dnode(dn
, offset
, tag
, dbp
);
230 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)(*dbp
);
231 err
= dbuf_read(db
, NULL
, db_flags
);
242 dmu_buf_hold(objset_t
*os
, uint64_t object
, uint64_t offset
,
243 const void *tag
, dmu_buf_t
**dbp
, int flags
)
246 int db_flags
= DB_RF_CANFAIL
;
248 if (flags
& DMU_READ_NO_PREFETCH
)
249 db_flags
|= DB_RF_NOPREFETCH
;
250 if (flags
& DMU_READ_NO_DECRYPT
)
251 db_flags
|= DB_RF_NO_DECRYPT
;
253 err
= dmu_buf_hold_noread(os
, object
, offset
, tag
, dbp
);
255 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)(*dbp
);
256 err
= dbuf_read(db
, NULL
, db_flags
);
269 return (DN_OLD_MAX_BONUSLEN
);
273 dmu_set_bonus(dmu_buf_t
*db_fake
, int newsize
, dmu_tx_t
*tx
)
275 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
282 if (dn
->dn_bonus
!= db
) {
283 error
= SET_ERROR(EINVAL
);
284 } else if (newsize
< 0 || newsize
> db_fake
->db_size
) {
285 error
= SET_ERROR(EINVAL
);
287 dnode_setbonuslen(dn
, newsize
, tx
);
296 dmu_set_bonustype(dmu_buf_t
*db_fake
, dmu_object_type_t type
, dmu_tx_t
*tx
)
298 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
305 if (!DMU_OT_IS_VALID(type
)) {
306 error
= SET_ERROR(EINVAL
);
307 } else if (dn
->dn_bonus
!= db
) {
308 error
= SET_ERROR(EINVAL
);
310 dnode_setbonus_type(dn
, type
, tx
);
319 dmu_get_bonustype(dmu_buf_t
*db_fake
)
321 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
323 dmu_object_type_t type
;
327 type
= dn
->dn_bonustype
;
334 dmu_rm_spill(objset_t
*os
, uint64_t object
, dmu_tx_t
*tx
)
339 error
= dnode_hold(os
, object
, FTAG
, &dn
);
340 dbuf_rm_spill(dn
, tx
);
341 rw_enter(&dn
->dn_struct_rwlock
, RW_WRITER
);
342 dnode_rm_spill(dn
, tx
);
343 rw_exit(&dn
->dn_struct_rwlock
);
344 dnode_rele(dn
, FTAG
);
349 * Lookup and hold the bonus buffer for the provided dnode. If the dnode
350 * has not yet been allocated a new bonus dbuf a will be allocated.
351 * Returns ENOENT, EIO, or 0.
353 int dmu_bonus_hold_by_dnode(dnode_t
*dn
, const void *tag
, dmu_buf_t
**dbp
,
358 uint32_t db_flags
= DB_RF_MUST_SUCCEED
;
360 if (flags
& DMU_READ_NO_PREFETCH
)
361 db_flags
|= DB_RF_NOPREFETCH
;
362 if (flags
& DMU_READ_NO_DECRYPT
)
363 db_flags
|= DB_RF_NO_DECRYPT
;
365 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
366 if (dn
->dn_bonus
== NULL
) {
367 if (!rw_tryupgrade(&dn
->dn_struct_rwlock
)) {
368 rw_exit(&dn
->dn_struct_rwlock
);
369 rw_enter(&dn
->dn_struct_rwlock
, RW_WRITER
);
371 if (dn
->dn_bonus
== NULL
)
372 dbuf_create_bonus(dn
);
376 /* as long as the bonus buf is held, the dnode will be held */
377 if (zfs_refcount_add(&db
->db_holds
, tag
) == 1) {
378 VERIFY(dnode_add_ref(dn
, db
));
379 atomic_inc_32(&dn
->dn_dbufs_count
);
383 * Wait to drop dn_struct_rwlock until after adding the bonus dbuf's
384 * hold and incrementing the dbuf count to ensure that dnode_move() sees
385 * a dnode hold for every dbuf.
387 rw_exit(&dn
->dn_struct_rwlock
);
389 error
= dbuf_read(db
, NULL
, db_flags
);
391 dnode_evict_bonus(dn
);
402 dmu_bonus_hold(objset_t
*os
, uint64_t object
, const void *tag
, dmu_buf_t
**dbp
)
407 error
= dnode_hold(os
, object
, FTAG
, &dn
);
411 error
= dmu_bonus_hold_by_dnode(dn
, tag
, dbp
, DMU_READ_NO_PREFETCH
);
412 dnode_rele(dn
, FTAG
);
418 * returns ENOENT, EIO, or 0.
420 * This interface will allocate a blank spill dbuf when a spill blk
421 * doesn't already exist on the dnode.
423 * if you only want to find an already existing spill db, then
424 * dmu_spill_hold_existing() should be used.
427 dmu_spill_hold_by_dnode(dnode_t
*dn
, uint32_t flags
, const void *tag
,
430 dmu_buf_impl_t
*db
= NULL
;
433 if ((flags
& DB_RF_HAVESTRUCT
) == 0)
434 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
436 db
= dbuf_hold(dn
, DMU_SPILL_BLKID
, tag
);
438 if ((flags
& DB_RF_HAVESTRUCT
) == 0)
439 rw_exit(&dn
->dn_struct_rwlock
);
443 return (SET_ERROR(EIO
));
445 err
= dbuf_read(db
, NULL
, flags
);
456 dmu_spill_hold_existing(dmu_buf_t
*bonus
, const void *tag
, dmu_buf_t
**dbp
)
458 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)bonus
;
465 if (spa_version(dn
->dn_objset
->os_spa
) < SPA_VERSION_SA
) {
466 err
= SET_ERROR(EINVAL
);
468 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
470 if (!dn
->dn_have_spill
) {
471 err
= SET_ERROR(ENOENT
);
473 err
= dmu_spill_hold_by_dnode(dn
,
474 DB_RF_HAVESTRUCT
| DB_RF_CANFAIL
, tag
, dbp
);
477 rw_exit(&dn
->dn_struct_rwlock
);
485 dmu_spill_hold_by_bonus(dmu_buf_t
*bonus
, uint32_t flags
, const void *tag
,
488 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)bonus
;
491 uint32_t db_flags
= DB_RF_CANFAIL
;
493 if (flags
& DMU_READ_NO_DECRYPT
)
494 db_flags
|= DB_RF_NO_DECRYPT
;
498 err
= dmu_spill_hold_by_dnode(dn
, db_flags
, tag
, dbp
);
505 * Note: longer-term, we should modify all of the dmu_buf_*() interfaces
506 * to take a held dnode rather than <os, object> -- the lookup is wasteful,
507 * and can induce severe lock contention when writing to several files
508 * whose dnodes are in the same block.
511 dmu_buf_hold_array_by_dnode(dnode_t
*dn
, uint64_t offset
, uint64_t length
,
512 boolean_t read
, const void *tag
, int *numbufsp
, dmu_buf_t
***dbpp
,
516 zstream_t
*zs
= NULL
;
517 uint64_t blkid
, nblks
, i
;
521 boolean_t missed
= B_FALSE
;
523 ASSERT(!read
|| length
<= DMU_MAX_ACCESS
);
526 * Note: We directly notify the prefetch code of this read, so that
527 * we can tell it about the multi-block read. dbuf_read() only knows
528 * about the one block it is accessing.
530 dbuf_flags
= DB_RF_CANFAIL
| DB_RF_NEVERWAIT
| DB_RF_HAVESTRUCT
|
533 if ((flags
& DMU_READ_NO_DECRYPT
) != 0)
534 dbuf_flags
|= DB_RF_NO_DECRYPT
;
536 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
537 if (dn
->dn_datablkshift
) {
538 int blkshift
= dn
->dn_datablkshift
;
539 nblks
= (P2ROUNDUP(offset
+ length
, 1ULL << blkshift
) -
540 P2ALIGN(offset
, 1ULL << blkshift
)) >> blkshift
;
542 if (offset
+ length
> dn
->dn_datablksz
) {
543 zfs_panic_recover("zfs: accessing past end of object "
544 "%llx/%llx (size=%u access=%llu+%llu)",
545 (longlong_t
)dn
->dn_objset
->
546 os_dsl_dataset
->ds_object
,
547 (longlong_t
)dn
->dn_object
, dn
->dn_datablksz
,
548 (longlong_t
)offset
, (longlong_t
)length
);
549 rw_exit(&dn
->dn_struct_rwlock
);
550 return (SET_ERROR(EIO
));
554 dbp
= kmem_zalloc(sizeof (dmu_buf_t
*) * nblks
, KM_SLEEP
);
557 zio
= zio_root(dn
->dn_objset
->os_spa
, NULL
, NULL
,
559 blkid
= dbuf_whichblock(dn
, 0, offset
);
560 if ((flags
& DMU_READ_NO_PREFETCH
) == 0) {
562 * Prepare the zfetch before initiating the demand reads, so
563 * that if multiple threads block on same indirect block, we
564 * base predictions on the original less racy request order.
566 zs
= dmu_zfetch_prepare(&dn
->dn_zfetch
, blkid
, nblks
, read
,
569 for (i
= 0; i
< nblks
; i
++) {
570 dmu_buf_impl_t
*db
= dbuf_hold(dn
, blkid
+ i
, tag
);
573 dmu_zfetch_run(zs
, missed
, B_TRUE
);
574 rw_exit(&dn
->dn_struct_rwlock
);
575 dmu_buf_rele_array(dbp
, nblks
, tag
);
578 return (SET_ERROR(EIO
));
582 * Initiate async demand data read.
583 * We check the db_state after calling dbuf_read() because
584 * (1) dbuf_read() may change the state to CACHED due to a
585 * hit in the ARC, and (2) on a cache miss, a child will
586 * have been added to "zio" but not yet completed, so the
587 * state will not yet be CACHED.
590 if (i
== nblks
- 1 && blkid
+ i
< dn
->dn_maxblkid
&&
591 offset
+ length
< db
->db
.db_offset
+
593 if (offset
<= db
->db
.db_offset
)
594 dbuf_flags
|= DB_RF_PARTIAL_FIRST
;
596 dbuf_flags
|= DB_RF_PARTIAL_MORE
;
598 (void) dbuf_read(db
, zio
, dbuf_flags
);
599 if (db
->db_state
!= DB_CACHED
)
606 zfs_racct_write(length
, nblks
);
609 dmu_zfetch_run(zs
, missed
, B_TRUE
);
610 rw_exit(&dn
->dn_struct_rwlock
);
613 /* wait for async read i/o */
616 dmu_buf_rele_array(dbp
, nblks
, tag
);
620 /* wait for other io to complete */
621 for (i
= 0; i
< nblks
; i
++) {
622 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)dbp
[i
];
623 mutex_enter(&db
->db_mtx
);
624 while (db
->db_state
== DB_READ
||
625 db
->db_state
== DB_FILL
)
626 cv_wait(&db
->db_changed
, &db
->db_mtx
);
627 if (db
->db_state
== DB_UNCACHED
)
628 err
= SET_ERROR(EIO
);
629 mutex_exit(&db
->db_mtx
);
631 dmu_buf_rele_array(dbp
, nblks
, tag
);
643 dmu_buf_hold_array(objset_t
*os
, uint64_t object
, uint64_t offset
,
644 uint64_t length
, int read
, const void *tag
, int *numbufsp
,
650 err
= dnode_hold(os
, object
, FTAG
, &dn
);
654 err
= dmu_buf_hold_array_by_dnode(dn
, offset
, length
, read
, tag
,
655 numbufsp
, dbpp
, DMU_READ_PREFETCH
);
657 dnode_rele(dn
, FTAG
);
663 dmu_buf_hold_array_by_bonus(dmu_buf_t
*db_fake
, uint64_t offset
,
664 uint64_t length
, boolean_t read
, const void *tag
, int *numbufsp
,
667 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
673 err
= dmu_buf_hold_array_by_dnode(dn
, offset
, length
, read
, tag
,
674 numbufsp
, dbpp
, DMU_READ_PREFETCH
);
681 dmu_buf_rele_array(dmu_buf_t
**dbp_fake
, int numbufs
, const void *tag
)
684 dmu_buf_impl_t
**dbp
= (dmu_buf_impl_t
**)dbp_fake
;
689 for (i
= 0; i
< numbufs
; i
++) {
691 dbuf_rele(dbp
[i
], tag
);
694 kmem_free(dbp
, sizeof (dmu_buf_t
*) * numbufs
);
698 * Issue prefetch I/Os for the given blocks. If level is greater than 0, the
699 * indirect blocks prefetched will be those that point to the blocks containing
700 * the data starting at offset, and continuing to offset + len. If the range
701 * it too long, prefetch the first dmu_prefetch_max bytes as requested, while
702 * for the rest only a higher level, also fitting within dmu_prefetch_max. It
703 * should primarily help random reads, since for long sequential reads there is
704 * a speculative prefetcher.
706 * Note that if the indirect blocks above the blocks being prefetched are not
707 * in cache, they will be asynchronously read in. Dnode read by dnode_hold()
708 * is currently synchronous.
711 dmu_prefetch(objset_t
*os
, uint64_t object
, int64_t level
, uint64_t offset
,
712 uint64_t len
, zio_priority_t pri
)
715 int64_t level2
= level
;
716 uint64_t start
, end
, start2
, end2
;
718 if (dmu_prefetch_max
== 0 || len
== 0) {
719 dmu_prefetch_dnode(os
, object
, pri
);
723 if (dnode_hold(os
, object
, FTAG
, &dn
) != 0)
727 * Depending on len we may do two prefetches: blocks [start, end) at
728 * level, and following blocks [start2, end2) at higher level2.
730 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
731 if (dn
->dn_datablkshift
!= 0) {
733 * The object has multiple blocks. Calculate the full range
734 * of blocks [start, end2) and then split it into two parts,
735 * so that the first [start, end) fits into dmu_prefetch_max.
737 start
= dbuf_whichblock(dn
, level
, offset
);
738 end2
= dbuf_whichblock(dn
, level
, offset
+ len
- 1) + 1;
739 uint8_t ibs
= dn
->dn_indblkshift
;
740 uint8_t bs
= (level
== 0) ? dn
->dn_datablkshift
: ibs
;
741 uint_t limit
= P2ROUNDUP(dmu_prefetch_max
, 1 << bs
) >> bs
;
742 start2
= end
= MIN(end2
, start
+ limit
);
745 * Find level2 where [start2, end2) fits into dmu_prefetch_max.
747 uint8_t ibps
= ibs
- SPA_BLKPTRSHIFT
;
748 limit
= P2ROUNDUP(dmu_prefetch_max
, 1 << ibs
) >> ibs
;
751 start2
= P2ROUNDUP(start2
, 1 << ibps
) >> ibps
;
752 end2
= P2ROUNDUP(end2
, 1 << ibps
) >> ibps
;
753 } while (end2
- start2
> limit
);
755 /* There is only one block. Prefetch it or nothing. */
756 start
= start2
= end2
= 0;
757 end
= start
+ (level
== 0 && offset
< dn
->dn_datablksz
);
760 for (uint64_t i
= start
; i
< end
; i
++)
761 dbuf_prefetch(dn
, level
, i
, pri
, 0);
762 for (uint64_t i
= start2
; i
< end2
; i
++)
763 dbuf_prefetch(dn
, level2
, i
, pri
, 0);
764 rw_exit(&dn
->dn_struct_rwlock
);
766 dnode_rele(dn
, FTAG
);
770 * Issue prefetch I/Os for the given object's dnode.
773 dmu_prefetch_dnode(objset_t
*os
, uint64_t object
, zio_priority_t pri
)
775 if (object
== 0 || object
>= DN_MAX_OBJECT
)
778 dnode_t
*dn
= DMU_META_DNODE(os
);
779 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
780 uint64_t blkid
= dbuf_whichblock(dn
, 0, object
* sizeof (dnode_phys_t
));
781 dbuf_prefetch(dn
, 0, blkid
, pri
, 0);
782 rw_exit(&dn
->dn_struct_rwlock
);
786 * Get the next "chunk" of file data to free. We traverse the file from
787 * the end so that the file gets shorter over time (if we crashes in the
788 * middle, this will leave us in a better state). We find allocated file
789 * data by simply searching the allocated level 1 indirects.
791 * On input, *start should be the first offset that does not need to be
792 * freed (e.g. "offset + length"). On return, *start will be the first
793 * offset that should be freed and l1blks is set to the number of level 1
794 * indirect blocks found within the chunk.
797 get_next_chunk(dnode_t
*dn
, uint64_t *start
, uint64_t minimum
, uint64_t *l1blks
)
800 uint64_t maxblks
= DMU_MAX_ACCESS
>> (dn
->dn_indblkshift
+ 1);
801 /* bytes of data covered by a level-1 indirect block */
802 uint64_t iblkrange
= (uint64_t)dn
->dn_datablksz
*
803 EPB(dn
->dn_indblkshift
, SPA_BLKPTRSHIFT
);
805 ASSERT3U(minimum
, <=, *start
);
808 * Check if we can free the entire range assuming that all of the
809 * L1 blocks in this range have data. If we can, we use this
810 * worst case value as an estimate so we can avoid having to look
811 * at the object's actual data.
813 uint64_t total_l1blks
=
814 (roundup(*start
, iblkrange
) - (minimum
/ iblkrange
* iblkrange
)) /
816 if (total_l1blks
<= maxblks
) {
817 *l1blks
= total_l1blks
;
821 ASSERT(ISP2(iblkrange
));
823 for (blks
= 0; *start
> minimum
&& blks
< maxblks
; blks
++) {
827 * dnode_next_offset(BACKWARDS) will find an allocated L1
828 * indirect block at or before the input offset. We must
829 * decrement *start so that it is at the end of the region
834 err
= dnode_next_offset(dn
,
835 DNODE_FIND_BACKWARDS
, start
, 2, 1, 0);
837 /* if there are no indirect blocks before start, we are done */
841 } else if (err
!= 0) {
846 /* set start to the beginning of this L1 indirect */
847 *start
= P2ALIGN(*start
, iblkrange
);
849 if (*start
< minimum
)
857 * If this objset is of type OST_ZFS return true if vfs's unmounted flag is set,
858 * otherwise return false.
859 * Used below in dmu_free_long_range_impl() to enable abort when unmounting
862 dmu_objset_zfs_unmounting(objset_t
*os
)
865 if (dmu_objset_type(os
) == DMU_OST_ZFS
)
866 return (zfs_get_vfs_flag_unmounted(os
));
874 dmu_free_long_range_impl(objset_t
*os
, dnode_t
*dn
, uint64_t offset
,
877 uint64_t object_size
;
879 uint64_t dirty_frees_threshold
;
880 dsl_pool_t
*dp
= dmu_objset_pool(os
);
883 return (SET_ERROR(EINVAL
));
885 object_size
= (dn
->dn_maxblkid
+ 1) * dn
->dn_datablksz
;
886 if (offset
>= object_size
)
889 if (zfs_per_txg_dirty_frees_percent
<= 100)
890 dirty_frees_threshold
=
891 zfs_per_txg_dirty_frees_percent
* zfs_dirty_data_max
/ 100;
893 dirty_frees_threshold
= zfs_dirty_data_max
/ 20;
895 if (length
== DMU_OBJECT_END
|| offset
+ length
> object_size
)
896 length
= object_size
- offset
;
898 while (length
!= 0) {
899 uint64_t chunk_end
, chunk_begin
, chunk_len
;
903 if (dmu_objset_zfs_unmounting(dn
->dn_objset
))
904 return (SET_ERROR(EINTR
));
906 chunk_end
= chunk_begin
= offset
+ length
;
908 /* move chunk_begin backwards to the beginning of this chunk */
909 err
= get_next_chunk(dn
, &chunk_begin
, offset
, &l1blks
);
912 ASSERT3U(chunk_begin
, >=, offset
);
913 ASSERT3U(chunk_begin
, <=, chunk_end
);
915 chunk_len
= chunk_end
- chunk_begin
;
917 tx
= dmu_tx_create(os
);
918 dmu_tx_hold_free(tx
, dn
->dn_object
, chunk_begin
, chunk_len
);
921 * Mark this transaction as typically resulting in a net
922 * reduction in space used.
924 dmu_tx_mark_netfree(tx
);
925 err
= dmu_tx_assign(tx
, TXG_WAIT
);
931 uint64_t txg
= dmu_tx_get_txg(tx
);
933 mutex_enter(&dp
->dp_lock
);
934 uint64_t long_free_dirty
=
935 dp
->dp_long_free_dirty_pertxg
[txg
& TXG_MASK
];
936 mutex_exit(&dp
->dp_lock
);
939 * To avoid filling up a TXG with just frees, wait for
940 * the next TXG to open before freeing more chunks if
941 * we have reached the threshold of frees.
943 if (dirty_frees_threshold
!= 0 &&
944 long_free_dirty
>= dirty_frees_threshold
) {
945 DMU_TX_STAT_BUMP(dmu_tx_dirty_frees_delay
);
947 txg_wait_open(dp
, 0, B_TRUE
);
952 * In order to prevent unnecessary write throttling, for each
953 * TXG, we track the cumulative size of L1 blocks being dirtied
954 * in dnode_free_range() below. We compare this number to a
955 * tunable threshold, past which we prevent new L1 dirty freeing
956 * blocks from being added into the open TXG. See
957 * dmu_free_long_range_impl() for details. The threshold
958 * prevents write throttle activation due to dirty freeing L1
959 * blocks taking up a large percentage of zfs_dirty_data_max.
961 mutex_enter(&dp
->dp_lock
);
962 dp
->dp_long_free_dirty_pertxg
[txg
& TXG_MASK
] +=
963 l1blks
<< dn
->dn_indblkshift
;
964 mutex_exit(&dp
->dp_lock
);
965 DTRACE_PROBE3(free__long__range
,
966 uint64_t, long_free_dirty
, uint64_t, chunk_len
,
968 dnode_free_range(dn
, chunk_begin
, chunk_len
, tx
);
978 dmu_free_long_range(objset_t
*os
, uint64_t object
,
979 uint64_t offset
, uint64_t length
)
984 err
= dnode_hold(os
, object
, FTAG
, &dn
);
987 err
= dmu_free_long_range_impl(os
, dn
, offset
, length
);
990 * It is important to zero out the maxblkid when freeing the entire
991 * file, so that (a) subsequent calls to dmu_free_long_range_impl()
992 * will take the fast path, and (b) dnode_reallocate() can verify
993 * that the entire file has been freed.
995 if (err
== 0 && offset
== 0 && length
== DMU_OBJECT_END
)
998 dnode_rele(dn
, FTAG
);
1003 dmu_free_long_object(objset_t
*os
, uint64_t object
)
1008 err
= dmu_free_long_range(os
, object
, 0, DMU_OBJECT_END
);
1012 tx
= dmu_tx_create(os
);
1013 dmu_tx_hold_bonus(tx
, object
);
1014 dmu_tx_hold_free(tx
, object
, 0, DMU_OBJECT_END
);
1015 dmu_tx_mark_netfree(tx
);
1016 err
= dmu_tx_assign(tx
, TXG_WAIT
);
1018 err
= dmu_object_free(os
, object
, tx
);
1028 dmu_free_range(objset_t
*os
, uint64_t object
, uint64_t offset
,
1029 uint64_t size
, dmu_tx_t
*tx
)
1032 int err
= dnode_hold(os
, object
, FTAG
, &dn
);
1035 ASSERT(offset
< UINT64_MAX
);
1036 ASSERT(size
== DMU_OBJECT_END
|| size
<= UINT64_MAX
- offset
);
1037 dnode_free_range(dn
, offset
, size
, tx
);
1038 dnode_rele(dn
, FTAG
);
1043 dmu_read_impl(dnode_t
*dn
, uint64_t offset
, uint64_t size
,
1044 void *buf
, uint32_t flags
)
1047 int numbufs
, err
= 0;
1050 * Deal with odd block sizes, where there can't be data past the first
1051 * block. If we ever do the tail block optimization, we will need to
1052 * handle that here as well.
1054 if (dn
->dn_maxblkid
== 0) {
1055 uint64_t newsz
= offset
> dn
->dn_datablksz
? 0 :
1056 MIN(size
, dn
->dn_datablksz
- offset
);
1057 memset((char *)buf
+ newsz
, 0, size
- newsz
);
1062 uint64_t mylen
= MIN(size
, DMU_MAX_ACCESS
/ 2);
1066 * NB: we could do this block-at-a-time, but it's nice
1067 * to be reading in parallel.
1069 err
= dmu_buf_hold_array_by_dnode(dn
, offset
, mylen
,
1070 TRUE
, FTAG
, &numbufs
, &dbp
, flags
);
1074 for (i
= 0; i
< numbufs
; i
++) {
1077 dmu_buf_t
*db
= dbp
[i
];
1081 bufoff
= offset
- db
->db_offset
;
1082 tocpy
= MIN(db
->db_size
- bufoff
, size
);
1084 (void) memcpy(buf
, (char *)db
->db_data
+ bufoff
, tocpy
);
1088 buf
= (char *)buf
+ tocpy
;
1090 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1096 dmu_read(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
1097 void *buf
, uint32_t flags
)
1102 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1106 err
= dmu_read_impl(dn
, offset
, size
, buf
, flags
);
1107 dnode_rele(dn
, FTAG
);
1112 dmu_read_by_dnode(dnode_t
*dn
, uint64_t offset
, uint64_t size
, void *buf
,
1115 return (dmu_read_impl(dn
, offset
, size
, buf
, flags
));
1119 dmu_write_impl(dmu_buf_t
**dbp
, int numbufs
, uint64_t offset
, uint64_t size
,
1120 const void *buf
, dmu_tx_t
*tx
)
1124 for (i
= 0; i
< numbufs
; i
++) {
1127 dmu_buf_t
*db
= dbp
[i
];
1131 bufoff
= offset
- db
->db_offset
;
1132 tocpy
= MIN(db
->db_size
- bufoff
, size
);
1134 ASSERT(i
== 0 || i
== numbufs
-1 || tocpy
== db
->db_size
);
1136 if (tocpy
== db
->db_size
)
1137 dmu_buf_will_fill(db
, tx
, B_FALSE
);
1139 dmu_buf_will_dirty(db
, tx
);
1141 (void) memcpy((char *)db
->db_data
+ bufoff
, buf
, tocpy
);
1143 if (tocpy
== db
->db_size
)
1144 dmu_buf_fill_done(db
, tx
, B_FALSE
);
1148 buf
= (char *)buf
+ tocpy
;
1153 dmu_write(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
1154 const void *buf
, dmu_tx_t
*tx
)
1162 VERIFY0(dmu_buf_hold_array(os
, object
, offset
, size
,
1163 FALSE
, FTAG
, &numbufs
, &dbp
));
1164 dmu_write_impl(dbp
, numbufs
, offset
, size
, buf
, tx
);
1165 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1169 * Note: Lustre is an external consumer of this interface.
1172 dmu_write_by_dnode(dnode_t
*dn
, uint64_t offset
, uint64_t size
,
1173 const void *buf
, dmu_tx_t
*tx
)
1181 VERIFY0(dmu_buf_hold_array_by_dnode(dn
, offset
, size
,
1182 FALSE
, FTAG
, &numbufs
, &dbp
, DMU_READ_PREFETCH
));
1183 dmu_write_impl(dbp
, numbufs
, offset
, size
, buf
, tx
);
1184 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1188 dmu_prealloc(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
1197 VERIFY(0 == dmu_buf_hold_array(os
, object
, offset
, size
,
1198 FALSE
, FTAG
, &numbufs
, &dbp
));
1200 for (i
= 0; i
< numbufs
; i
++) {
1201 dmu_buf_t
*db
= dbp
[i
];
1203 dmu_buf_will_not_fill(db
, tx
);
1205 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1209 dmu_write_embedded(objset_t
*os
, uint64_t object
, uint64_t offset
,
1210 void *data
, uint8_t etype
, uint8_t comp
, int uncompressed_size
,
1211 int compressed_size
, int byteorder
, dmu_tx_t
*tx
)
1215 ASSERT3U(etype
, <, NUM_BP_EMBEDDED_TYPES
);
1216 ASSERT3U(comp
, <, ZIO_COMPRESS_FUNCTIONS
);
1217 VERIFY0(dmu_buf_hold_noread(os
, object
, offset
,
1220 dmu_buf_write_embedded(db
,
1221 data
, (bp_embedded_type_t
)etype
, (enum zio_compress
)comp
,
1222 uncompressed_size
, compressed_size
, byteorder
, tx
);
1224 dmu_buf_rele(db
, FTAG
);
1228 dmu_redact(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
1234 VERIFY0(dmu_buf_hold_array(os
, object
, offset
, size
, FALSE
, FTAG
,
1236 for (i
= 0; i
< numbufs
; i
++)
1237 dmu_buf_redact(dbp
[i
], tx
);
1238 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1243 dmu_read_uio_dnode(dnode_t
*dn
, zfs_uio_t
*uio
, uint64_t size
)
1246 int numbufs
, i
, err
;
1249 * NB: we could do this block-at-a-time, but it's nice
1250 * to be reading in parallel.
1252 err
= dmu_buf_hold_array_by_dnode(dn
, zfs_uio_offset(uio
), size
,
1253 TRUE
, FTAG
, &numbufs
, &dbp
, 0);
1257 for (i
= 0; i
< numbufs
; i
++) {
1260 dmu_buf_t
*db
= dbp
[i
];
1264 bufoff
= zfs_uio_offset(uio
) - db
->db_offset
;
1265 tocpy
= MIN(db
->db_size
- bufoff
, size
);
1267 err
= zfs_uio_fault_move((char *)db
->db_data
+ bufoff
, tocpy
,
1275 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1281 * Read 'size' bytes into the uio buffer.
1282 * From object zdb->db_object.
1283 * Starting at zfs_uio_offset(uio).
1285 * If the caller already has a dbuf in the target object
1286 * (e.g. its bonus buffer), this routine is faster than dmu_read_uio(),
1287 * because we don't have to find the dnode_t for the object.
1290 dmu_read_uio_dbuf(dmu_buf_t
*zdb
, zfs_uio_t
*uio
, uint64_t size
)
1292 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)zdb
;
1301 err
= dmu_read_uio_dnode(dn
, uio
, size
);
1308 * Read 'size' bytes into the uio buffer.
1309 * From the specified object
1310 * Starting at offset zfs_uio_offset(uio).
1313 dmu_read_uio(objset_t
*os
, uint64_t object
, zfs_uio_t
*uio
, uint64_t size
)
1321 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1325 err
= dmu_read_uio_dnode(dn
, uio
, size
);
1327 dnode_rele(dn
, FTAG
);
1333 dmu_write_uio_dnode(dnode_t
*dn
, zfs_uio_t
*uio
, uint64_t size
, dmu_tx_t
*tx
)
1340 err
= dmu_buf_hold_array_by_dnode(dn
, zfs_uio_offset(uio
), size
,
1341 FALSE
, FTAG
, &numbufs
, &dbp
, DMU_READ_PREFETCH
);
1345 for (i
= 0; i
< numbufs
; i
++) {
1348 dmu_buf_t
*db
= dbp
[i
];
1352 offset_t off
= zfs_uio_offset(uio
);
1353 bufoff
= off
- db
->db_offset
;
1354 tocpy
= MIN(db
->db_size
- bufoff
, size
);
1356 ASSERT(i
== 0 || i
== numbufs
-1 || tocpy
== db
->db_size
);
1358 if (tocpy
== db
->db_size
)
1359 dmu_buf_will_fill(db
, tx
, B_TRUE
);
1361 dmu_buf_will_dirty(db
, tx
);
1363 err
= zfs_uio_fault_move((char *)db
->db_data
+ bufoff
,
1364 tocpy
, UIO_WRITE
, uio
);
1366 if (tocpy
== db
->db_size
&& dmu_buf_fill_done(db
, tx
, err
)) {
1367 /* The fill was reverted. Undo any uio progress. */
1368 zfs_uio_advance(uio
, off
- zfs_uio_offset(uio
));
1377 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1382 * Write 'size' bytes from the uio buffer.
1383 * To object zdb->db_object.
1384 * Starting at offset zfs_uio_offset(uio).
1386 * If the caller already has a dbuf in the target object
1387 * (e.g. its bonus buffer), this routine is faster than dmu_write_uio(),
1388 * because we don't have to find the dnode_t for the object.
1391 dmu_write_uio_dbuf(dmu_buf_t
*zdb
, zfs_uio_t
*uio
, uint64_t size
,
1394 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)zdb
;
1403 err
= dmu_write_uio_dnode(dn
, uio
, size
, tx
);
1410 * Write 'size' bytes from the uio buffer.
1411 * To the specified object.
1412 * Starting at offset zfs_uio_offset(uio).
1415 dmu_write_uio(objset_t
*os
, uint64_t object
, zfs_uio_t
*uio
, uint64_t size
,
1424 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1428 err
= dmu_write_uio_dnode(dn
, uio
, size
, tx
);
1430 dnode_rele(dn
, FTAG
);
1434 #endif /* _KERNEL */
1437 * Allocate a loaned anonymous arc buffer.
1440 dmu_request_arcbuf(dmu_buf_t
*handle
, int size
)
1442 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)handle
;
1444 return (arc_loan_buf(db
->db_objset
->os_spa
, B_FALSE
, size
));
1448 * Free a loaned arc buffer.
1451 dmu_return_arcbuf(arc_buf_t
*buf
)
1453 arc_return_buf(buf
, FTAG
);
1454 arc_buf_destroy(buf
, FTAG
);
1458 * A "lightweight" write is faster than a regular write (e.g.
1459 * dmu_write_by_dnode() or dmu_assign_arcbuf_by_dnode()), because it avoids the
1460 * CPU cost of creating a dmu_buf_impl_t and arc_buf_[hdr_]_t. However, the
1461 * data can not be read or overwritten until the transaction's txg has been
1462 * synced. This makes it appropriate for workloads that are known to be
1463 * (temporarily) write-only, like "zfs receive".
1465 * A single block is written, starting at the specified offset in bytes. If
1466 * the call is successful, it returns 0 and the provided abd has been
1467 * consumed (the caller should not free it).
1470 dmu_lightweight_write_by_dnode(dnode_t
*dn
, uint64_t offset
, abd_t
*abd
,
1471 const zio_prop_t
*zp
, zio_flag_t flags
, dmu_tx_t
*tx
)
1473 dbuf_dirty_record_t
*dr
=
1474 dbuf_dirty_lightweight(dn
, dbuf_whichblock(dn
, 0, offset
), tx
);
1476 return (SET_ERROR(EIO
));
1477 dr
->dt
.dll
.dr_abd
= abd
;
1478 dr
->dt
.dll
.dr_props
= *zp
;
1479 dr
->dt
.dll
.dr_flags
= flags
;
1484 * When possible directly assign passed loaned arc buffer to a dbuf.
1485 * If this is not possible copy the contents of passed arc buf via
1489 dmu_assign_arcbuf_by_dnode(dnode_t
*dn
, uint64_t offset
, arc_buf_t
*buf
,
1493 objset_t
*os
= dn
->dn_objset
;
1494 uint64_t object
= dn
->dn_object
;
1495 uint32_t blksz
= (uint32_t)arc_buf_lsize(buf
);
1498 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
1499 blkid
= dbuf_whichblock(dn
, 0, offset
);
1500 db
= dbuf_hold(dn
, blkid
, FTAG
);
1501 rw_exit(&dn
->dn_struct_rwlock
);
1503 return (SET_ERROR(EIO
));
1506 * We can only assign if the offset is aligned and the arc buf is the
1507 * same size as the dbuf.
1509 if (offset
== db
->db
.db_offset
&& blksz
== db
->db
.db_size
) {
1510 zfs_racct_write(blksz
, 1);
1511 dbuf_assign_arcbuf(db
, buf
, tx
);
1512 dbuf_rele(db
, FTAG
);
1514 /* compressed bufs must always be assignable to their dbuf */
1515 ASSERT3U(arc_get_compression(buf
), ==, ZIO_COMPRESS_OFF
);
1516 ASSERT(!(buf
->b_flags
& ARC_BUF_FLAG_COMPRESSED
));
1518 dbuf_rele(db
, FTAG
);
1519 dmu_write(os
, object
, offset
, blksz
, buf
->b_data
, tx
);
1520 dmu_return_arcbuf(buf
);
1527 dmu_assign_arcbuf_by_dbuf(dmu_buf_t
*handle
, uint64_t offset
, arc_buf_t
*buf
,
1531 dmu_buf_impl_t
*dbuf
= (dmu_buf_impl_t
*)handle
;
1533 DB_DNODE_ENTER(dbuf
);
1534 err
= dmu_assign_arcbuf_by_dnode(DB_DNODE(dbuf
), offset
, buf
, tx
);
1535 DB_DNODE_EXIT(dbuf
);
1541 dbuf_dirty_record_t
*dsa_dr
;
1542 dmu_sync_cb_t
*dsa_done
;
1548 dmu_sync_ready(zio_t
*zio
, arc_buf_t
*buf
, void *varg
)
1551 dmu_sync_arg_t
*dsa
= varg
;
1552 dmu_buf_t
*db
= dsa
->dsa_zgd
->zgd_db
;
1553 blkptr_t
*bp
= zio
->io_bp
;
1555 if (zio
->io_error
== 0) {
1556 if (BP_IS_HOLE(bp
)) {
1558 * A block of zeros may compress to a hole, but the
1559 * block size still needs to be known for replay.
1561 BP_SET_LSIZE(bp
, db
->db_size
);
1562 } else if (!BP_IS_EMBEDDED(bp
)) {
1563 ASSERT(BP_GET_LEVEL(bp
) == 0);
1570 dmu_sync_late_arrival_ready(zio_t
*zio
)
1572 dmu_sync_ready(zio
, NULL
, zio
->io_private
);
1576 dmu_sync_done(zio_t
*zio
, arc_buf_t
*buf
, void *varg
)
1579 dmu_sync_arg_t
*dsa
= varg
;
1580 dbuf_dirty_record_t
*dr
= dsa
->dsa_dr
;
1581 dmu_buf_impl_t
*db
= dr
->dr_dbuf
;
1582 zgd_t
*zgd
= dsa
->dsa_zgd
;
1585 * Record the vdev(s) backing this blkptr so they can be flushed after
1586 * the writes for the lwb have completed.
1588 if (zio
->io_error
== 0) {
1589 zil_lwb_add_block(zgd
->zgd_lwb
, zgd
->zgd_bp
);
1592 mutex_enter(&db
->db_mtx
);
1593 ASSERT(dr
->dt
.dl
.dr_override_state
== DR_IN_DMU_SYNC
);
1594 if (zio
->io_error
== 0) {
1595 dr
->dt
.dl
.dr_nopwrite
= !!(zio
->io_flags
& ZIO_FLAG_NOPWRITE
);
1596 if (dr
->dt
.dl
.dr_nopwrite
) {
1597 blkptr_t
*bp
= zio
->io_bp
;
1598 blkptr_t
*bp_orig
= &zio
->io_bp_orig
;
1599 uint8_t chksum
= BP_GET_CHECKSUM(bp_orig
);
1601 ASSERT(BP_EQUAL(bp
, bp_orig
));
1602 VERIFY(BP_EQUAL(bp
, db
->db_blkptr
));
1603 ASSERT(zio
->io_prop
.zp_compress
!= ZIO_COMPRESS_OFF
);
1604 VERIFY(zio_checksum_table
[chksum
].ci_flags
&
1605 ZCHECKSUM_FLAG_NOPWRITE
);
1607 dr
->dt
.dl
.dr_overridden_by
= *zio
->io_bp
;
1608 dr
->dt
.dl
.dr_override_state
= DR_OVERRIDDEN
;
1609 dr
->dt
.dl
.dr_copies
= zio
->io_prop
.zp_copies
;
1612 * Old style holes are filled with all zeros, whereas
1613 * new-style holes maintain their lsize, type, level,
1614 * and birth time (see zio_write_compress). While we
1615 * need to reset the BP_SET_LSIZE() call that happened
1616 * in dmu_sync_ready for old style holes, we do *not*
1617 * want to wipe out the information contained in new
1618 * style holes. Thus, only zero out the block pointer if
1619 * it's an old style hole.
1621 if (BP_IS_HOLE(&dr
->dt
.dl
.dr_overridden_by
) &&
1622 dr
->dt
.dl
.dr_overridden_by
.blk_birth
== 0)
1623 BP_ZERO(&dr
->dt
.dl
.dr_overridden_by
);
1625 dr
->dt
.dl
.dr_override_state
= DR_NOT_OVERRIDDEN
;
1627 cv_broadcast(&db
->db_changed
);
1628 mutex_exit(&db
->db_mtx
);
1630 dsa
->dsa_done(dsa
->dsa_zgd
, zio
->io_error
);
1632 kmem_free(dsa
, sizeof (*dsa
));
1636 dmu_sync_late_arrival_done(zio_t
*zio
)
1638 blkptr_t
*bp
= zio
->io_bp
;
1639 dmu_sync_arg_t
*dsa
= zio
->io_private
;
1640 zgd_t
*zgd
= dsa
->dsa_zgd
;
1642 if (zio
->io_error
== 0) {
1644 * Record the vdev(s) backing this blkptr so they can be
1645 * flushed after the writes for the lwb have completed.
1647 zil_lwb_add_block(zgd
->zgd_lwb
, zgd
->zgd_bp
);
1649 if (!BP_IS_HOLE(bp
)) {
1650 blkptr_t
*bp_orig __maybe_unused
= &zio
->io_bp_orig
;
1651 ASSERT(!(zio
->io_flags
& ZIO_FLAG_NOPWRITE
));
1652 ASSERT(BP_IS_HOLE(bp_orig
) || !BP_EQUAL(bp
, bp_orig
));
1653 ASSERT(zio
->io_bp
->blk_birth
== zio
->io_txg
);
1654 ASSERT(zio
->io_txg
> spa_syncing_txg(zio
->io_spa
));
1655 zio_free(zio
->io_spa
, zio
->io_txg
, zio
->io_bp
);
1659 dmu_tx_commit(dsa
->dsa_tx
);
1661 dsa
->dsa_done(dsa
->dsa_zgd
, zio
->io_error
);
1663 abd_free(zio
->io_abd
);
1664 kmem_free(dsa
, sizeof (*dsa
));
1668 dmu_sync_late_arrival(zio_t
*pio
, objset_t
*os
, dmu_sync_cb_t
*done
, zgd_t
*zgd
,
1669 zio_prop_t
*zp
, zbookmark_phys_t
*zb
)
1671 dmu_sync_arg_t
*dsa
;
1675 error
= dbuf_read((dmu_buf_impl_t
*)zgd
->zgd_db
, NULL
,
1676 DB_RF_CANFAIL
| DB_RF_NOPREFETCH
);
1680 tx
= dmu_tx_create(os
);
1681 dmu_tx_hold_space(tx
, zgd
->zgd_db
->db_size
);
1683 * This transaction does not produce any dirty data or log blocks, so
1684 * it should not be throttled. All other cases wait for TXG sync, by
1685 * which time the log block we are writing will be obsolete, so we can
1686 * skip waiting and just return error here instead.
1688 if (dmu_tx_assign(tx
, TXG_NOWAIT
| TXG_NOTHROTTLE
) != 0) {
1690 /* Make zl_get_data do txg_waited_synced() */
1691 return (SET_ERROR(EIO
));
1695 * In order to prevent the zgd's lwb from being free'd prior to
1696 * dmu_sync_late_arrival_done() being called, we have to ensure
1697 * the lwb's "max txg" takes this tx's txg into account.
1699 zil_lwb_add_txg(zgd
->zgd_lwb
, dmu_tx_get_txg(tx
));
1701 dsa
= kmem_alloc(sizeof (dmu_sync_arg_t
), KM_SLEEP
);
1703 dsa
->dsa_done
= done
;
1708 * Since we are currently syncing this txg, it's nontrivial to
1709 * determine what BP to nopwrite against, so we disable nopwrite.
1711 * When syncing, the db_blkptr is initially the BP of the previous
1712 * txg. We can not nopwrite against it because it will be changed
1713 * (this is similar to the non-late-arrival case where the dbuf is
1714 * dirty in a future txg).
1716 * Then dbuf_write_ready() sets bp_blkptr to the location we will write.
1717 * We can not nopwrite against it because although the BP will not
1718 * (typically) be changed, the data has not yet been persisted to this
1721 * Finally, when dbuf_write_done() is called, it is theoretically
1722 * possible to always nopwrite, because the data that was written in
1723 * this txg is the same data that we are trying to write. However we
1724 * would need to check that this dbuf is not dirty in any future
1725 * txg's (as we do in the normal dmu_sync() path). For simplicity, we
1726 * don't nopwrite in this case.
1728 zp
->zp_nopwrite
= B_FALSE
;
1730 zio_nowait(zio_write(pio
, os
->os_spa
, dmu_tx_get_txg(tx
), zgd
->zgd_bp
,
1731 abd_get_from_buf(zgd
->zgd_db
->db_data
, zgd
->zgd_db
->db_size
),
1732 zgd
->zgd_db
->db_size
, zgd
->zgd_db
->db_size
, zp
,
1733 dmu_sync_late_arrival_ready
, NULL
, dmu_sync_late_arrival_done
,
1734 dsa
, ZIO_PRIORITY_SYNC_WRITE
, ZIO_FLAG_CANFAIL
, zb
));
1740 * Intent log support: sync the block associated with db to disk.
1741 * N.B. and XXX: the caller is responsible for making sure that the
1742 * data isn't changing while dmu_sync() is writing it.
1746 * EEXIST: this txg has already been synced, so there's nothing to do.
1747 * The caller should not log the write.
1749 * ENOENT: the block was dbuf_free_range()'d, so there's nothing to do.
1750 * The caller should not log the write.
1752 * EALREADY: this block is already in the process of being synced.
1753 * The caller should track its progress (somehow).
1755 * EIO: could not do the I/O.
1756 * The caller should do a txg_wait_synced().
1758 * 0: the I/O has been initiated.
1759 * The caller should log this blkptr in the done callback.
1760 * It is possible that the I/O will fail, in which case
1761 * the error will be reported to the done callback and
1762 * propagated to pio from zio_done().
1765 dmu_sync(zio_t
*pio
, uint64_t txg
, dmu_sync_cb_t
*done
, zgd_t
*zgd
)
1767 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)zgd
->zgd_db
;
1768 objset_t
*os
= db
->db_objset
;
1769 dsl_dataset_t
*ds
= os
->os_dsl_dataset
;
1770 dbuf_dirty_record_t
*dr
, *dr_next
;
1771 dmu_sync_arg_t
*dsa
;
1772 zbookmark_phys_t zb
;
1776 ASSERT(pio
!= NULL
);
1779 SET_BOOKMARK(&zb
, ds
->ds_object
,
1780 db
->db
.db_object
, db
->db_level
, db
->db_blkid
);
1784 dmu_write_policy(os
, dn
, db
->db_level
, WP_DMU_SYNC
, &zp
);
1788 * If we're frozen (running ziltest), we always need to generate a bp.
1790 if (txg
> spa_freeze_txg(os
->os_spa
))
1791 return (dmu_sync_late_arrival(pio
, os
, done
, zgd
, &zp
, &zb
));
1794 * Grabbing db_mtx now provides a barrier between dbuf_sync_leaf()
1795 * and us. If we determine that this txg is not yet syncing,
1796 * but it begins to sync a moment later, that's OK because the
1797 * sync thread will block in dbuf_sync_leaf() until we drop db_mtx.
1799 mutex_enter(&db
->db_mtx
);
1801 if (txg
<= spa_last_synced_txg(os
->os_spa
)) {
1803 * This txg has already synced. There's nothing to do.
1805 mutex_exit(&db
->db_mtx
);
1806 return (SET_ERROR(EEXIST
));
1809 if (txg
<= spa_syncing_txg(os
->os_spa
)) {
1811 * This txg is currently syncing, so we can't mess with
1812 * the dirty record anymore; just write a new log block.
1814 mutex_exit(&db
->db_mtx
);
1815 return (dmu_sync_late_arrival(pio
, os
, done
, zgd
, &zp
, &zb
));
1818 dr
= dbuf_find_dirty_eq(db
, txg
);
1822 * There's no dr for this dbuf, so it must have been freed.
1823 * There's no need to log writes to freed blocks, so we're done.
1825 mutex_exit(&db
->db_mtx
);
1826 return (SET_ERROR(ENOENT
));
1829 dr_next
= list_next(&db
->db_dirty_records
, dr
);
1830 ASSERT(dr_next
== NULL
|| dr_next
->dr_txg
< txg
);
1832 if (db
->db_blkptr
!= NULL
) {
1834 * We need to fill in zgd_bp with the current blkptr so that
1835 * the nopwrite code can check if we're writing the same
1836 * data that's already on disk. We can only nopwrite if we
1837 * are sure that after making the copy, db_blkptr will not
1838 * change until our i/o completes. We ensure this by
1839 * holding the db_mtx, and only allowing nopwrite if the
1840 * block is not already dirty (see below). This is verified
1841 * by dmu_sync_done(), which VERIFYs that the db_blkptr has
1844 *zgd
->zgd_bp
= *db
->db_blkptr
;
1848 * Assume the on-disk data is X, the current syncing data (in
1849 * txg - 1) is Y, and the current in-memory data is Z (currently
1852 * We usually want to perform a nopwrite if X and Z are the
1853 * same. However, if Y is different (i.e. the BP is going to
1854 * change before this write takes effect), then a nopwrite will
1855 * be incorrect - we would override with X, which could have
1856 * been freed when Y was written.
1858 * (Note that this is not a concern when we are nop-writing from
1859 * syncing context, because X and Y must be identical, because
1860 * all previous txgs have been synced.)
1862 * Therefore, we disable nopwrite if the current BP could change
1863 * before this TXG. There are two ways it could change: by
1864 * being dirty (dr_next is non-NULL), or by being freed
1865 * (dnode_block_freed()). This behavior is verified by
1866 * zio_done(), which VERIFYs that the override BP is identical
1867 * to the on-disk BP.
1871 if (dr_next
!= NULL
|| dnode_block_freed(dn
, db
->db_blkid
))
1872 zp
.zp_nopwrite
= B_FALSE
;
1875 ASSERT(dr
->dr_txg
== txg
);
1876 if (dr
->dt
.dl
.dr_override_state
== DR_IN_DMU_SYNC
||
1877 dr
->dt
.dl
.dr_override_state
== DR_OVERRIDDEN
) {
1879 * We have already issued a sync write for this buffer,
1880 * or this buffer has already been synced. It could not
1881 * have been dirtied since, or we would have cleared the state.
1883 mutex_exit(&db
->db_mtx
);
1884 return (SET_ERROR(EALREADY
));
1887 ASSERT(dr
->dt
.dl
.dr_override_state
== DR_NOT_OVERRIDDEN
);
1888 dr
->dt
.dl
.dr_override_state
= DR_IN_DMU_SYNC
;
1889 mutex_exit(&db
->db_mtx
);
1891 dsa
= kmem_alloc(sizeof (dmu_sync_arg_t
), KM_SLEEP
);
1893 dsa
->dsa_done
= done
;
1897 zio_nowait(arc_write(pio
, os
->os_spa
, txg
, zgd
->zgd_bp
,
1898 dr
->dt
.dl
.dr_data
, !DBUF_IS_CACHEABLE(db
), dbuf_is_l2cacheable(db
),
1899 &zp
, dmu_sync_ready
, NULL
, dmu_sync_done
, dsa
,
1900 ZIO_PRIORITY_SYNC_WRITE
, ZIO_FLAG_CANFAIL
, &zb
));
1906 dmu_object_set_nlevels(objset_t
*os
, uint64_t object
, int nlevels
, dmu_tx_t
*tx
)
1911 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1914 err
= dnode_set_nlevels(dn
, nlevels
, tx
);
1915 dnode_rele(dn
, FTAG
);
1920 dmu_object_set_blocksize(objset_t
*os
, uint64_t object
, uint64_t size
, int ibs
,
1926 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1929 err
= dnode_set_blksz(dn
, size
, ibs
, tx
);
1930 dnode_rele(dn
, FTAG
);
1935 dmu_object_set_maxblkid(objset_t
*os
, uint64_t object
, uint64_t maxblkid
,
1941 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1944 rw_enter(&dn
->dn_struct_rwlock
, RW_WRITER
);
1945 dnode_new_blkid(dn
, maxblkid
, tx
, B_FALSE
, B_TRUE
);
1946 rw_exit(&dn
->dn_struct_rwlock
);
1947 dnode_rele(dn
, FTAG
);
1952 dmu_object_set_checksum(objset_t
*os
, uint64_t object
, uint8_t checksum
,
1958 * Send streams include each object's checksum function. This
1959 * check ensures that the receiving system can understand the
1960 * checksum function transmitted.
1962 ASSERT3U(checksum
, <, ZIO_CHECKSUM_LEGACY_FUNCTIONS
);
1964 VERIFY0(dnode_hold(os
, object
, FTAG
, &dn
));
1965 ASSERT3U(checksum
, <, ZIO_CHECKSUM_FUNCTIONS
);
1966 dn
->dn_checksum
= checksum
;
1967 dnode_setdirty(dn
, tx
);
1968 dnode_rele(dn
, FTAG
);
1972 dmu_object_set_compress(objset_t
*os
, uint64_t object
, uint8_t compress
,
1978 * Send streams include each object's compression function. This
1979 * check ensures that the receiving system can understand the
1980 * compression function transmitted.
1982 ASSERT3U(compress
, <, ZIO_COMPRESS_LEGACY_FUNCTIONS
);
1984 VERIFY0(dnode_hold(os
, object
, FTAG
, &dn
));
1985 dn
->dn_compress
= compress
;
1986 dnode_setdirty(dn
, tx
);
1987 dnode_rele(dn
, FTAG
);
1991 * When the "redundant_metadata" property is set to "most", only indirect
1992 * blocks of this level and higher will have an additional ditto block.
1994 static const int zfs_redundant_metadata_most_ditto_level
= 2;
1997 dmu_write_policy(objset_t
*os
, dnode_t
*dn
, int level
, int wp
, zio_prop_t
*zp
)
1999 dmu_object_type_t type
= dn
? dn
->dn_type
: DMU_OT_OBJSET
;
2000 boolean_t ismd
= (level
> 0 || DMU_OT_IS_METADATA(type
) ||
2002 enum zio_checksum checksum
= os
->os_checksum
;
2003 enum zio_compress compress
= os
->os_compress
;
2004 uint8_t complevel
= os
->os_complevel
;
2005 enum zio_checksum dedup_checksum
= os
->os_dedup_checksum
;
2006 boolean_t dedup
= B_FALSE
;
2007 boolean_t nopwrite
= B_FALSE
;
2008 boolean_t dedup_verify
= os
->os_dedup_verify
;
2009 boolean_t encrypt
= B_FALSE
;
2010 int copies
= os
->os_copies
;
2013 * We maintain different write policies for each of the following
2016 * 2. preallocated blocks (i.e. level-0 blocks of a dump device)
2017 * 3. all other level 0 blocks
2021 * XXX -- we should design a compression algorithm
2022 * that specializes in arrays of bps.
2024 compress
= zio_compress_select(os
->os_spa
,
2025 ZIO_COMPRESS_ON
, ZIO_COMPRESS_ON
);
2028 * Metadata always gets checksummed. If the data
2029 * checksum is multi-bit correctable, and it's not a
2030 * ZBT-style checksum, then it's suitable for metadata
2031 * as well. Otherwise, the metadata checksum defaults
2034 if (!(zio_checksum_table
[checksum
].ci_flags
&
2035 ZCHECKSUM_FLAG_METADATA
) ||
2036 (zio_checksum_table
[checksum
].ci_flags
&
2037 ZCHECKSUM_FLAG_EMBEDDED
))
2038 checksum
= ZIO_CHECKSUM_FLETCHER_4
;
2040 switch (os
->os_redundant_metadata
) {
2041 case ZFS_REDUNDANT_METADATA_ALL
:
2044 case ZFS_REDUNDANT_METADATA_MOST
:
2045 if (level
>= zfs_redundant_metadata_most_ditto_level
||
2046 DMU_OT_IS_METADATA(type
) || (wp
& WP_SPILL
))
2049 case ZFS_REDUNDANT_METADATA_SOME
:
2050 if (DMU_OT_IS_CRITICAL(type
))
2053 case ZFS_REDUNDANT_METADATA_NONE
:
2056 } else if (wp
& WP_NOFILL
) {
2060 * If we're writing preallocated blocks, we aren't actually
2061 * writing them so don't set any policy properties. These
2062 * blocks are currently only used by an external subsystem
2063 * outside of zfs (i.e. dump) and not written by the zio
2066 compress
= ZIO_COMPRESS_OFF
;
2067 checksum
= ZIO_CHECKSUM_OFF
;
2069 compress
= zio_compress_select(os
->os_spa
, dn
->dn_compress
,
2071 complevel
= zio_complevel_select(os
->os_spa
, compress
,
2072 complevel
, complevel
);
2074 checksum
= (dedup_checksum
== ZIO_CHECKSUM_OFF
) ?
2075 zio_checksum_select(dn
->dn_checksum
, checksum
) :
2079 * Determine dedup setting. If we are in dmu_sync(),
2080 * we won't actually dedup now because that's all
2081 * done in syncing context; but we do want to use the
2082 * dedup checksum. If the checksum is not strong
2083 * enough to ensure unique signatures, force
2086 if (dedup_checksum
!= ZIO_CHECKSUM_OFF
) {
2087 dedup
= (wp
& WP_DMU_SYNC
) ? B_FALSE
: B_TRUE
;
2088 if (!(zio_checksum_table
[checksum
].ci_flags
&
2089 ZCHECKSUM_FLAG_DEDUP
))
2090 dedup_verify
= B_TRUE
;
2094 * Enable nopwrite if we have secure enough checksum
2095 * algorithm (see comment in zio_nop_write) and
2096 * compression is enabled. We don't enable nopwrite if
2097 * dedup is enabled as the two features are mutually
2100 nopwrite
= (!dedup
&& (zio_checksum_table
[checksum
].ci_flags
&
2101 ZCHECKSUM_FLAG_NOPWRITE
) &&
2102 compress
!= ZIO_COMPRESS_OFF
&& zfs_nopwrite_enabled
);
2106 * All objects in an encrypted objset are protected from modification
2107 * via a MAC. Encrypted objects store their IV and salt in the last DVA
2108 * in the bp, so we cannot use all copies. Encrypted objects are also
2109 * not subject to nopwrite since writing the same data will still
2110 * result in a new ciphertext. Only encrypted blocks can be dedup'd
2111 * to avoid ambiguity in the dedup code since the DDT does not store
2114 if (os
->os_encrypted
&& (wp
& WP_NOFILL
) == 0) {
2117 if (DMU_OT_IS_ENCRYPTED(type
)) {
2118 copies
= MIN(copies
, SPA_DVAS_PER_BP
- 1);
2125 (type
== DMU_OT_DNODE
|| type
== DMU_OT_OBJSET
)) {
2126 compress
= ZIO_COMPRESS_EMPTY
;
2130 zp
->zp_compress
= compress
;
2131 zp
->zp_complevel
= complevel
;
2132 zp
->zp_checksum
= checksum
;
2133 zp
->zp_type
= (wp
& WP_SPILL
) ? dn
->dn_bonustype
: type
;
2134 zp
->zp_level
= level
;
2135 zp
->zp_copies
= MIN(copies
, spa_max_replication(os
->os_spa
));
2136 zp
->zp_dedup
= dedup
;
2137 zp
->zp_dedup_verify
= dedup
&& dedup_verify
;
2138 zp
->zp_nopwrite
= nopwrite
;
2139 zp
->zp_encrypt
= encrypt
;
2140 zp
->zp_byteorder
= ZFS_HOST_BYTEORDER
;
2141 memset(zp
->zp_salt
, 0, ZIO_DATA_SALT_LEN
);
2142 memset(zp
->zp_iv
, 0, ZIO_DATA_IV_LEN
);
2143 memset(zp
->zp_mac
, 0, ZIO_DATA_MAC_LEN
);
2144 zp
->zp_zpl_smallblk
= DMU_OT_IS_FILE(zp
->zp_type
) ?
2145 os
->os_zpl_special_smallblock
: 0;
2147 ASSERT3U(zp
->zp_compress
, !=, ZIO_COMPRESS_INHERIT
);
2151 * Reports the location of data and holes in an object. In order to
2152 * accurately report holes all dirty data must be synced to disk. This
2153 * causes extremely poor performance when seeking for holes in a dirty file.
2154 * As a compromise, only provide hole data when the dnode is clean. When
2155 * a dnode is dirty report the dnode as having no holes by returning EBUSY
2156 * which is always safe to do.
2159 dmu_offset_next(objset_t
*os
, uint64_t object
, boolean_t hole
, uint64_t *off
)
2162 int restarted
= 0, err
;
2165 err
= dnode_hold(os
, object
, FTAG
, &dn
);
2169 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
2171 if (dnode_is_dirty(dn
)) {
2173 * If the zfs_dmu_offset_next_sync module option is enabled
2174 * then hole reporting has been requested. Dirty dnodes
2175 * must be synced to disk to accurately report holes.
2177 * Provided a RL_READER rangelock spanning 0-UINT64_MAX is
2178 * held by the caller only a single restart will be required.
2179 * We tolerate callers which do not hold the rangelock by
2180 * returning EBUSY and not reporting holes after one restart.
2182 if (zfs_dmu_offset_next_sync
) {
2183 rw_exit(&dn
->dn_struct_rwlock
);
2184 dnode_rele(dn
, FTAG
);
2187 return (SET_ERROR(EBUSY
));
2189 txg_wait_synced(dmu_objset_pool(os
), 0);
2194 err
= SET_ERROR(EBUSY
);
2196 err
= dnode_next_offset(dn
, DNODE_FIND_HAVELOCK
|
2197 (hole
? DNODE_FIND_HOLE
: 0), off
, 1, 1, 0);
2200 rw_exit(&dn
->dn_struct_rwlock
);
2201 dnode_rele(dn
, FTAG
);
2207 dmu_read_l0_bps(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t length
,
2208 blkptr_t
*bps
, size_t *nbpsp
)
2210 dmu_buf_t
**dbp
, *dbuf
;
2215 error
= dmu_buf_hold_array(os
, object
, offset
, length
, FALSE
, FTAG
,
2218 if (error
== ESRCH
) {
2219 error
= SET_ERROR(ENXIO
);
2224 ASSERT3U(numbufs
, <=, *nbpsp
);
2226 for (int i
= 0; i
< numbufs
; i
++) {
2228 db
= (dmu_buf_impl_t
*)dbuf
;
2230 mutex_enter(&db
->db_mtx
);
2232 if (!list_is_empty(&db
->db_dirty_records
)) {
2233 dbuf_dirty_record_t
*dr
;
2235 dr
= list_head(&db
->db_dirty_records
);
2236 if (dr
->dt
.dl
.dr_brtwrite
) {
2238 * This is very special case where we clone a
2239 * block and in the same transaction group we
2240 * read its BP (most likely to clone the clone).
2242 bp
= &dr
->dt
.dl
.dr_overridden_by
;
2245 * The block was modified in the same
2246 * transaction group.
2248 mutex_exit(&db
->db_mtx
);
2249 error
= SET_ERROR(EAGAIN
);
2256 mutex_exit(&db
->db_mtx
);
2260 * The block was created in this transaction group,
2261 * so it has no BP yet.
2263 error
= SET_ERROR(EAGAIN
);
2267 * Make sure we clone only data blocks.
2269 if (BP_IS_METADATA(bp
) && !BP_IS_HOLE(bp
)) {
2270 error
= SET_ERROR(EINVAL
);
2275 * If the block was allocated in transaction group that is not
2276 * yet synced, we could clone it, but we couldn't write this
2277 * operation into ZIL, or it may be impossible to replay, since
2278 * the block may appear not yet allocated at that point.
2280 if (BP_PHYSICAL_BIRTH(bp
) > spa_freeze_txg(os
->os_spa
)) {
2281 error
= SET_ERROR(EINVAL
);
2284 if (BP_PHYSICAL_BIRTH(bp
) > spa_last_synced_txg(os
->os_spa
)) {
2285 error
= SET_ERROR(EAGAIN
);
2294 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
2300 dmu_brt_clone(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t length
,
2301 dmu_tx_t
*tx
, const blkptr_t
*bps
, size_t nbps
)
2304 dmu_buf_t
**dbp
, *dbuf
;
2306 struct dirty_leaf
*dl
;
2307 dbuf_dirty_record_t
*dr
;
2309 int error
= 0, i
, numbufs
;
2313 VERIFY0(dmu_buf_hold_array(os
, object
, offset
, length
, FALSE
, FTAG
,
2315 ASSERT3U(nbps
, ==, numbufs
);
2318 * Before we start cloning make sure that the dbufs sizes match new BPs
2319 * sizes. If they don't, that's a no-go, as we are not able to shrink
2322 for (i
= 0; i
< numbufs
; i
++) {
2324 db
= (dmu_buf_impl_t
*)dbuf
;
2327 ASSERT0(db
->db_level
);
2328 ASSERT(db
->db_blkid
!= DMU_BONUS_BLKID
);
2329 ASSERT(db
->db_blkid
!= DMU_SPILL_BLKID
);
2331 if (!BP_IS_HOLE(bp
) && BP_GET_LSIZE(bp
) != dbuf
->db_size
) {
2332 error
= SET_ERROR(EXDEV
);
2337 for (i
= 0; i
< numbufs
; i
++) {
2339 db
= (dmu_buf_impl_t
*)dbuf
;
2342 ASSERT0(db
->db_level
);
2343 ASSERT(db
->db_blkid
!= DMU_BONUS_BLKID
);
2344 ASSERT(db
->db_blkid
!= DMU_SPILL_BLKID
);
2345 ASSERT(BP_IS_HOLE(bp
) || dbuf
->db_size
== BP_GET_LSIZE(bp
));
2347 dmu_buf_will_clone(dbuf
, tx
);
2349 mutex_enter(&db
->db_mtx
);
2351 dr
= list_head(&db
->db_dirty_records
);
2353 ASSERT3U(dr
->dr_txg
, ==, tx
->tx_txg
);
2355 dl
->dr_overridden_by
= *bp
;
2356 dl
->dr_brtwrite
= B_TRUE
;
2357 dl
->dr_override_state
= DR_OVERRIDDEN
;
2358 if (BP_IS_HOLE(bp
)) {
2359 dl
->dr_overridden_by
.blk_birth
= 0;
2360 dl
->dr_overridden_by
.blk_phys_birth
= 0;
2362 dl
->dr_overridden_by
.blk_birth
= dr
->dr_txg
;
2363 if (!BP_IS_EMBEDDED(bp
)) {
2364 dl
->dr_overridden_by
.blk_phys_birth
=
2365 BP_PHYSICAL_BIRTH(bp
);
2369 mutex_exit(&db
->db_mtx
);
2372 * When data in embedded into BP there is no need to create
2373 * BRT entry as there is no data block. Just copy the BP as
2374 * it contains the data.
2376 if (!BP_IS_HOLE(bp
) && !BP_IS_EMBEDDED(bp
)) {
2377 brt_pending_add(spa
, bp
, tx
);
2381 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
2387 __dmu_object_info_from_dnode(dnode_t
*dn
, dmu_object_info_t
*doi
)
2389 dnode_phys_t
*dnp
= dn
->dn_phys
;
2391 doi
->doi_data_block_size
= dn
->dn_datablksz
;
2392 doi
->doi_metadata_block_size
= dn
->dn_indblkshift
?
2393 1ULL << dn
->dn_indblkshift
: 0;
2394 doi
->doi_type
= dn
->dn_type
;
2395 doi
->doi_bonus_type
= dn
->dn_bonustype
;
2396 doi
->doi_bonus_size
= dn
->dn_bonuslen
;
2397 doi
->doi_dnodesize
= dn
->dn_num_slots
<< DNODE_SHIFT
;
2398 doi
->doi_indirection
= dn
->dn_nlevels
;
2399 doi
->doi_checksum
= dn
->dn_checksum
;
2400 doi
->doi_compress
= dn
->dn_compress
;
2401 doi
->doi_nblkptr
= dn
->dn_nblkptr
;
2402 doi
->doi_physical_blocks_512
= (DN_USED_BYTES(dnp
) + 256) >> 9;
2403 doi
->doi_max_offset
= (dn
->dn_maxblkid
+ 1) * dn
->dn_datablksz
;
2404 doi
->doi_fill_count
= 0;
2405 for (int i
= 0; i
< dnp
->dn_nblkptr
; i
++)
2406 doi
->doi_fill_count
+= BP_GET_FILL(&dnp
->dn_blkptr
[i
]);
2410 dmu_object_info_from_dnode(dnode_t
*dn
, dmu_object_info_t
*doi
)
2412 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
2413 mutex_enter(&dn
->dn_mtx
);
2415 __dmu_object_info_from_dnode(dn
, doi
);
2417 mutex_exit(&dn
->dn_mtx
);
2418 rw_exit(&dn
->dn_struct_rwlock
);
2422 * Get information on a DMU object.
2423 * If doi is NULL, just indicates whether the object exists.
2426 dmu_object_info(objset_t
*os
, uint64_t object
, dmu_object_info_t
*doi
)
2429 int err
= dnode_hold(os
, object
, FTAG
, &dn
);
2435 dmu_object_info_from_dnode(dn
, doi
);
2437 dnode_rele(dn
, FTAG
);
2442 * As above, but faster; can be used when you have a held dbuf in hand.
2445 dmu_object_info_from_db(dmu_buf_t
*db_fake
, dmu_object_info_t
*doi
)
2447 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
2450 dmu_object_info_from_dnode(DB_DNODE(db
), doi
);
2455 * Faster still when you only care about the size.
2458 dmu_object_size_from_db(dmu_buf_t
*db_fake
, uint32_t *blksize
,
2459 u_longlong_t
*nblk512
)
2461 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
2467 *blksize
= dn
->dn_datablksz
;
2468 /* add in number of slots used for the dnode itself */
2469 *nblk512
= ((DN_USED_BYTES(dn
->dn_phys
) + SPA_MINBLOCKSIZE
/2) >>
2470 SPA_MINBLOCKSHIFT
) + dn
->dn_num_slots
;
2475 dmu_object_dnsize_from_db(dmu_buf_t
*db_fake
, int *dnsize
)
2477 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
2482 *dnsize
= dn
->dn_num_slots
<< DNODE_SHIFT
;
2487 byteswap_uint64_array(void *vbuf
, size_t size
)
2489 uint64_t *buf
= vbuf
;
2490 size_t count
= size
>> 3;
2493 ASSERT((size
& 7) == 0);
2495 for (i
= 0; i
< count
; i
++)
2496 buf
[i
] = BSWAP_64(buf
[i
]);
2500 byteswap_uint32_array(void *vbuf
, size_t size
)
2502 uint32_t *buf
= vbuf
;
2503 size_t count
= size
>> 2;
2506 ASSERT((size
& 3) == 0);
2508 for (i
= 0; i
< count
; i
++)
2509 buf
[i
] = BSWAP_32(buf
[i
]);
2513 byteswap_uint16_array(void *vbuf
, size_t size
)
2515 uint16_t *buf
= vbuf
;
2516 size_t count
= size
>> 1;
2519 ASSERT((size
& 1) == 0);
2521 for (i
= 0; i
< count
; i
++)
2522 buf
[i
] = BSWAP_16(buf
[i
]);
2526 byteswap_uint8_array(void *vbuf
, size_t size
)
2528 (void) vbuf
, (void) size
;
2549 arc_fini(); /* arc depends on l2arc, so arc must go first */
2561 EXPORT_SYMBOL(dmu_bonus_hold
);
2562 EXPORT_SYMBOL(dmu_bonus_hold_by_dnode
);
2563 EXPORT_SYMBOL(dmu_buf_hold_array_by_bonus
);
2564 EXPORT_SYMBOL(dmu_buf_rele_array
);
2565 EXPORT_SYMBOL(dmu_prefetch
);
2566 EXPORT_SYMBOL(dmu_free_range
);
2567 EXPORT_SYMBOL(dmu_free_long_range
);
2568 EXPORT_SYMBOL(dmu_free_long_object
);
2569 EXPORT_SYMBOL(dmu_read
);
2570 EXPORT_SYMBOL(dmu_read_by_dnode
);
2571 EXPORT_SYMBOL(dmu_write
);
2572 EXPORT_SYMBOL(dmu_write_by_dnode
);
2573 EXPORT_SYMBOL(dmu_prealloc
);
2574 EXPORT_SYMBOL(dmu_object_info
);
2575 EXPORT_SYMBOL(dmu_object_info_from_dnode
);
2576 EXPORT_SYMBOL(dmu_object_info_from_db
);
2577 EXPORT_SYMBOL(dmu_object_size_from_db
);
2578 EXPORT_SYMBOL(dmu_object_dnsize_from_db
);
2579 EXPORT_SYMBOL(dmu_object_set_nlevels
);
2580 EXPORT_SYMBOL(dmu_object_set_blocksize
);
2581 EXPORT_SYMBOL(dmu_object_set_maxblkid
);
2582 EXPORT_SYMBOL(dmu_object_set_checksum
);
2583 EXPORT_SYMBOL(dmu_object_set_compress
);
2584 EXPORT_SYMBOL(dmu_offset_next
);
2585 EXPORT_SYMBOL(dmu_write_policy
);
2586 EXPORT_SYMBOL(dmu_sync
);
2587 EXPORT_SYMBOL(dmu_request_arcbuf
);
2588 EXPORT_SYMBOL(dmu_return_arcbuf
);
2589 EXPORT_SYMBOL(dmu_assign_arcbuf_by_dnode
);
2590 EXPORT_SYMBOL(dmu_assign_arcbuf_by_dbuf
);
2591 EXPORT_SYMBOL(dmu_buf_hold
);
2592 EXPORT_SYMBOL(dmu_ot
);
2594 ZFS_MODULE_PARAM(zfs
, zfs_
, nopwrite_enabled
, INT
, ZMOD_RW
,
2595 "Enable NOP writes");
2597 ZFS_MODULE_PARAM(zfs
, zfs_
, per_txg_dirty_frees_percent
, UINT
, ZMOD_RW
,
2598 "Percentage of dirtied blocks from frees in one TXG");
2600 ZFS_MODULE_PARAM(zfs
, zfs_
, dmu_offset_next_sync
, INT
, ZMOD_RW
,
2601 "Enable forcing txg sync to find holes");
2604 ZFS_MODULE_PARAM(zfs
, , dmu_prefetch_max
, UINT
, ZMOD_RW
,
2605 "Limit one prefetch call to this size");