4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2014 by Delphix. All rights reserved.
25 /* Copyright (c) 2013 by Saso Kiselkov. All rights reserved. */
26 /* Copyright (c) 2013, Joyent, Inc. All rights reserved. */
27 /* Copyright (c) 2014, Nexenta Systems, Inc. All rights reserved. */
30 #include <sys/dmu_impl.h>
31 #include <sys/dmu_tx.h>
33 #include <sys/dnode.h>
34 #include <sys/zfs_context.h>
35 #include <sys/dmu_objset.h>
36 #include <sys/dmu_traverse.h>
37 #include <sys/dsl_dataset.h>
38 #include <sys/dsl_dir.h>
39 #include <sys/dsl_pool.h>
40 #include <sys/dsl_synctask.h>
41 #include <sys/dsl_prop.h>
42 #include <sys/dmu_zfetch.h>
43 #include <sys/zfs_ioctl.h>
45 #include <sys/zio_checksum.h>
46 #include <sys/zio_compress.h>
48 #include <sys/zfeature.h>
50 #include <sys/vmsystm.h>
51 #include <sys/zfs_znode.h>
55 * Enable/disable nopwrite feature.
57 int zfs_nopwrite_enabled
= 1;
59 const dmu_object_type_info_t dmu_ot
[DMU_OT_NUMTYPES
] = {
60 { DMU_BSWAP_UINT8
, TRUE
, "unallocated" },
61 { DMU_BSWAP_ZAP
, TRUE
, "object directory" },
62 { DMU_BSWAP_UINT64
, TRUE
, "object array" },
63 { DMU_BSWAP_UINT8
, TRUE
, "packed nvlist" },
64 { DMU_BSWAP_UINT64
, TRUE
, "packed nvlist size" },
65 { DMU_BSWAP_UINT64
, TRUE
, "bpobj" },
66 { DMU_BSWAP_UINT64
, TRUE
, "bpobj header" },
67 { DMU_BSWAP_UINT64
, TRUE
, "SPA space map header" },
68 { DMU_BSWAP_UINT64
, TRUE
, "SPA space map" },
69 { DMU_BSWAP_UINT64
, TRUE
, "ZIL intent log" },
70 { DMU_BSWAP_DNODE
, TRUE
, "DMU dnode" },
71 { DMU_BSWAP_OBJSET
, TRUE
, "DMU objset" },
72 { DMU_BSWAP_UINT64
, TRUE
, "DSL directory" },
73 { DMU_BSWAP_ZAP
, TRUE
, "DSL directory child map"},
74 { DMU_BSWAP_ZAP
, TRUE
, "DSL dataset snap map" },
75 { DMU_BSWAP_ZAP
, TRUE
, "DSL props" },
76 { DMU_BSWAP_UINT64
, TRUE
, "DSL dataset" },
77 { DMU_BSWAP_ZNODE
, TRUE
, "ZFS znode" },
78 { DMU_BSWAP_OLDACL
, TRUE
, "ZFS V0 ACL" },
79 { DMU_BSWAP_UINT8
, FALSE
, "ZFS plain file" },
80 { DMU_BSWAP_ZAP
, TRUE
, "ZFS directory" },
81 { DMU_BSWAP_ZAP
, TRUE
, "ZFS master node" },
82 { DMU_BSWAP_ZAP
, TRUE
, "ZFS delete queue" },
83 { DMU_BSWAP_UINT8
, FALSE
, "zvol object" },
84 { DMU_BSWAP_ZAP
, TRUE
, "zvol prop" },
85 { DMU_BSWAP_UINT8
, FALSE
, "other uint8[]" },
86 { DMU_BSWAP_UINT64
, FALSE
, "other uint64[]" },
87 { DMU_BSWAP_ZAP
, TRUE
, "other ZAP" },
88 { DMU_BSWAP_ZAP
, TRUE
, "persistent error log" },
89 { DMU_BSWAP_UINT8
, TRUE
, "SPA history" },
90 { DMU_BSWAP_UINT64
, TRUE
, "SPA history offsets" },
91 { DMU_BSWAP_ZAP
, TRUE
, "Pool properties" },
92 { DMU_BSWAP_ZAP
, TRUE
, "DSL permissions" },
93 { DMU_BSWAP_ACL
, TRUE
, "ZFS ACL" },
94 { DMU_BSWAP_UINT8
, TRUE
, "ZFS SYSACL" },
95 { DMU_BSWAP_UINT8
, TRUE
, "FUID table" },
96 { DMU_BSWAP_UINT64
, TRUE
, "FUID table size" },
97 { DMU_BSWAP_ZAP
, TRUE
, "DSL dataset next clones"},
98 { DMU_BSWAP_ZAP
, TRUE
, "scan work queue" },
99 { DMU_BSWAP_ZAP
, TRUE
, "ZFS user/group used" },
100 { DMU_BSWAP_ZAP
, TRUE
, "ZFS user/group quota" },
101 { DMU_BSWAP_ZAP
, TRUE
, "snapshot refcount tags"},
102 { DMU_BSWAP_ZAP
, TRUE
, "DDT ZAP algorithm" },
103 { DMU_BSWAP_ZAP
, TRUE
, "DDT statistics" },
104 { DMU_BSWAP_UINT8
, TRUE
, "System attributes" },
105 { DMU_BSWAP_ZAP
, TRUE
, "SA master node" },
106 { DMU_BSWAP_ZAP
, TRUE
, "SA attr registration" },
107 { DMU_BSWAP_ZAP
, TRUE
, "SA attr layouts" },
108 { DMU_BSWAP_ZAP
, TRUE
, "scan translations" },
109 { DMU_BSWAP_UINT8
, FALSE
, "deduplicated block" },
110 { DMU_BSWAP_ZAP
, TRUE
, "DSL deadlist map" },
111 { DMU_BSWAP_UINT64
, TRUE
, "DSL deadlist map hdr" },
112 { DMU_BSWAP_ZAP
, TRUE
, "DSL dir clones" },
113 { DMU_BSWAP_UINT64
, TRUE
, "bpobj subobj" }
116 const dmu_object_byteswap_info_t dmu_ot_byteswap
[DMU_BSWAP_NUMFUNCS
] = {
117 { byteswap_uint8_array
, "uint8" },
118 { byteswap_uint16_array
, "uint16" },
119 { byteswap_uint32_array
, "uint32" },
120 { byteswap_uint64_array
, "uint64" },
121 { zap_byteswap
, "zap" },
122 { dnode_buf_byteswap
, "dnode" },
123 { dmu_objset_byteswap
, "objset" },
124 { zfs_znode_byteswap
, "znode" },
125 { zfs_oldacl_byteswap
, "oldacl" },
126 { zfs_acl_byteswap
, "acl" }
130 dmu_buf_hold_noread(objset_t
*os
, uint64_t object
, uint64_t offset
,
131 void *tag
, dmu_buf_t
**dbp
)
138 err
= dnode_hold(os
, object
, FTAG
, &dn
);
141 blkid
= dbuf_whichblock(dn
, offset
);
142 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
143 db
= dbuf_hold(dn
, blkid
, tag
);
144 rw_exit(&dn
->dn_struct_rwlock
);
145 dnode_rele(dn
, FTAG
);
149 return (SET_ERROR(EIO
));
157 dmu_buf_hold(objset_t
*os
, uint64_t object
, uint64_t offset
,
158 void *tag
, dmu_buf_t
**dbp
, int flags
)
161 int db_flags
= DB_RF_CANFAIL
;
163 if (flags
& DMU_READ_NO_PREFETCH
)
164 db_flags
|= DB_RF_NOPREFETCH
;
166 err
= dmu_buf_hold_noread(os
, object
, offset
, tag
, dbp
);
168 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)(*dbp
);
169 err
= dbuf_read(db
, NULL
, db_flags
);
182 return (DN_MAX_BONUSLEN
);
186 dmu_set_bonus(dmu_buf_t
*db_fake
, int newsize
, dmu_tx_t
*tx
)
188 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
195 if (dn
->dn_bonus
!= db
) {
196 error
= SET_ERROR(EINVAL
);
197 } else if (newsize
< 0 || newsize
> db_fake
->db_size
) {
198 error
= SET_ERROR(EINVAL
);
200 dnode_setbonuslen(dn
, newsize
, tx
);
209 dmu_set_bonustype(dmu_buf_t
*db_fake
, dmu_object_type_t type
, dmu_tx_t
*tx
)
211 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
218 if (!DMU_OT_IS_VALID(type
)) {
219 error
= SET_ERROR(EINVAL
);
220 } else if (dn
->dn_bonus
!= db
) {
221 error
= SET_ERROR(EINVAL
);
223 dnode_setbonus_type(dn
, type
, tx
);
232 dmu_get_bonustype(dmu_buf_t
*db_fake
)
234 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
236 dmu_object_type_t type
;
240 type
= dn
->dn_bonustype
;
247 dmu_rm_spill(objset_t
*os
, uint64_t object
, dmu_tx_t
*tx
)
252 error
= dnode_hold(os
, object
, FTAG
, &dn
);
253 dbuf_rm_spill(dn
, tx
);
254 rw_enter(&dn
->dn_struct_rwlock
, RW_WRITER
);
255 dnode_rm_spill(dn
, tx
);
256 rw_exit(&dn
->dn_struct_rwlock
);
257 dnode_rele(dn
, FTAG
);
262 * returns ENOENT, EIO, or 0.
265 dmu_bonus_hold(objset_t
*os
, uint64_t object
, void *tag
, dmu_buf_t
**dbp
)
271 error
= dnode_hold(os
, object
, FTAG
, &dn
);
275 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
276 if (dn
->dn_bonus
== NULL
) {
277 rw_exit(&dn
->dn_struct_rwlock
);
278 rw_enter(&dn
->dn_struct_rwlock
, RW_WRITER
);
279 if (dn
->dn_bonus
== NULL
)
280 dbuf_create_bonus(dn
);
284 /* as long as the bonus buf is held, the dnode will be held */
285 if (refcount_add(&db
->db_holds
, tag
) == 1) {
286 VERIFY(dnode_add_ref(dn
, db
));
287 atomic_inc_32(&dn
->dn_dbufs_count
);
291 * Wait to drop dn_struct_rwlock until after adding the bonus dbuf's
292 * hold and incrementing the dbuf count to ensure that dnode_move() sees
293 * a dnode hold for every dbuf.
295 rw_exit(&dn
->dn_struct_rwlock
);
297 dnode_rele(dn
, FTAG
);
299 VERIFY(0 == dbuf_read(db
, NULL
, DB_RF_MUST_SUCCEED
| DB_RF_NOPREFETCH
));
306 * returns ENOENT, EIO, or 0.
308 * This interface will allocate a blank spill dbuf when a spill blk
309 * doesn't already exist on the dnode.
311 * if you only want to find an already existing spill db, then
312 * dmu_spill_hold_existing() should be used.
315 dmu_spill_hold_by_dnode(dnode_t
*dn
, uint32_t flags
, void *tag
, dmu_buf_t
**dbp
)
317 dmu_buf_impl_t
*db
= NULL
;
320 if ((flags
& DB_RF_HAVESTRUCT
) == 0)
321 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
323 db
= dbuf_hold(dn
, DMU_SPILL_BLKID
, tag
);
325 if ((flags
& DB_RF_HAVESTRUCT
) == 0)
326 rw_exit(&dn
->dn_struct_rwlock
);
329 err
= dbuf_read(db
, NULL
, flags
);
338 dmu_spill_hold_existing(dmu_buf_t
*bonus
, void *tag
, dmu_buf_t
**dbp
)
340 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)bonus
;
347 if (spa_version(dn
->dn_objset
->os_spa
) < SPA_VERSION_SA
) {
348 err
= SET_ERROR(EINVAL
);
350 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
352 if (!dn
->dn_have_spill
) {
353 err
= SET_ERROR(ENOENT
);
355 err
= dmu_spill_hold_by_dnode(dn
,
356 DB_RF_HAVESTRUCT
| DB_RF_CANFAIL
, tag
, dbp
);
359 rw_exit(&dn
->dn_struct_rwlock
);
367 dmu_spill_hold_by_bonus(dmu_buf_t
*bonus
, void *tag
, dmu_buf_t
**dbp
)
369 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)bonus
;
375 err
= dmu_spill_hold_by_dnode(dn
, DB_RF_CANFAIL
, tag
, dbp
);
382 * Note: longer-term, we should modify all of the dmu_buf_*() interfaces
383 * to take a held dnode rather than <os, object> -- the lookup is wasteful,
384 * and can induce severe lock contention when writing to several files
385 * whose dnodes are in the same block.
388 dmu_buf_hold_array_by_dnode(dnode_t
*dn
, uint64_t offset
, uint64_t length
,
389 int read
, void *tag
, int *numbufsp
, dmu_buf_t
***dbpp
, uint32_t flags
)
392 uint64_t blkid
, nblks
, i
;
397 ASSERT(length
<= DMU_MAX_ACCESS
);
399 dbuf_flags
= DB_RF_CANFAIL
| DB_RF_NEVERWAIT
| DB_RF_HAVESTRUCT
;
400 if (flags
& DMU_READ_NO_PREFETCH
|| length
> zfetch_array_rd_sz
)
401 dbuf_flags
|= DB_RF_NOPREFETCH
;
403 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
404 if (dn
->dn_datablkshift
) {
405 int blkshift
= dn
->dn_datablkshift
;
406 nblks
= (P2ROUNDUP(offset
+length
, 1ULL<<blkshift
) -
407 P2ALIGN(offset
, 1ULL<<blkshift
)) >> blkshift
;
409 if (offset
+ length
> dn
->dn_datablksz
) {
410 zfs_panic_recover("zfs: accessing past end of object "
411 "%llx/%llx (size=%u access=%llu+%llu)",
412 (longlong_t
)dn
->dn_objset
->
413 os_dsl_dataset
->ds_object
,
414 (longlong_t
)dn
->dn_object
, dn
->dn_datablksz
,
415 (longlong_t
)offset
, (longlong_t
)length
);
416 rw_exit(&dn
->dn_struct_rwlock
);
417 return (SET_ERROR(EIO
));
421 dbp
= kmem_zalloc(sizeof (dmu_buf_t
*) * nblks
, KM_SLEEP
);
423 zio
= zio_root(dn
->dn_objset
->os_spa
, NULL
, NULL
, ZIO_FLAG_CANFAIL
);
424 blkid
= dbuf_whichblock(dn
, offset
);
425 for (i
= 0; i
< nblks
; i
++) {
426 dmu_buf_impl_t
*db
= dbuf_hold(dn
, blkid
+i
, tag
);
428 rw_exit(&dn
->dn_struct_rwlock
);
429 dmu_buf_rele_array(dbp
, nblks
, tag
);
431 return (SET_ERROR(EIO
));
433 /* initiate async i/o */
435 (void) dbuf_read(db
, zio
, dbuf_flags
);
439 rw_exit(&dn
->dn_struct_rwlock
);
441 /* wait for async i/o */
444 dmu_buf_rele_array(dbp
, nblks
, tag
);
448 /* wait for other io to complete */
450 for (i
= 0; i
< nblks
; i
++) {
451 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)dbp
[i
];
452 mutex_enter(&db
->db_mtx
);
453 while (db
->db_state
== DB_READ
||
454 db
->db_state
== DB_FILL
)
455 cv_wait(&db
->db_changed
, &db
->db_mtx
);
456 if (db
->db_state
== DB_UNCACHED
)
457 err
= SET_ERROR(EIO
);
458 mutex_exit(&db
->db_mtx
);
460 dmu_buf_rele_array(dbp
, nblks
, tag
);
472 dmu_buf_hold_array(objset_t
*os
, uint64_t object
, uint64_t offset
,
473 uint64_t length
, int read
, void *tag
, int *numbufsp
, dmu_buf_t
***dbpp
)
478 err
= dnode_hold(os
, object
, FTAG
, &dn
);
482 err
= dmu_buf_hold_array_by_dnode(dn
, offset
, length
, read
, tag
,
483 numbufsp
, dbpp
, DMU_READ_PREFETCH
);
485 dnode_rele(dn
, FTAG
);
491 dmu_buf_hold_array_by_bonus(dmu_buf_t
*db_fake
, uint64_t offset
,
492 uint64_t length
, int read
, void *tag
, int *numbufsp
, dmu_buf_t
***dbpp
)
494 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
500 err
= dmu_buf_hold_array_by_dnode(dn
, offset
, length
, read
, tag
,
501 numbufsp
, dbpp
, DMU_READ_PREFETCH
);
508 dmu_buf_rele_array(dmu_buf_t
**dbp_fake
, int numbufs
, void *tag
)
511 dmu_buf_impl_t
**dbp
= (dmu_buf_impl_t
**)dbp_fake
;
516 for (i
= 0; i
< numbufs
; i
++) {
518 dbuf_rele(dbp
[i
], tag
);
521 kmem_free(dbp
, sizeof (dmu_buf_t
*) * numbufs
);
525 * Issue prefetch i/os for the given blocks.
527 * Note: The assumption is that we *know* these blocks will be needed
528 * almost immediately. Therefore, the prefetch i/os will be issued at
529 * ZIO_PRIORITY_SYNC_READ
531 * Note: indirect blocks and other metadata will be read synchronously,
532 * causing this function to block if they are not already cached.
535 dmu_prefetch(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t len
)
541 if (zfs_prefetch_disable
)
544 if (len
== 0) { /* they're interested in the bonus buffer */
545 dn
= DMU_META_DNODE(os
);
547 if (object
== 0 || object
>= DN_MAX_OBJECT
)
550 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
551 blkid
= dbuf_whichblock(dn
, object
* sizeof (dnode_phys_t
));
552 dbuf_prefetch(dn
, blkid
, ZIO_PRIORITY_SYNC_READ
);
553 rw_exit(&dn
->dn_struct_rwlock
);
558 * XXX - Note, if the dnode for the requested object is not
559 * already cached, we will do a *synchronous* read in the
560 * dnode_hold() call. The same is true for any indirects.
562 err
= dnode_hold(os
, object
, FTAG
, &dn
);
566 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
567 if (dn
->dn_datablkshift
) {
568 int blkshift
= dn
->dn_datablkshift
;
569 nblks
= (P2ROUNDUP(offset
+ len
, 1 << blkshift
) -
570 P2ALIGN(offset
, 1 << blkshift
)) >> blkshift
;
572 nblks
= (offset
< dn
->dn_datablksz
);
576 blkid
= dbuf_whichblock(dn
, offset
);
577 for (int i
= 0; i
< nblks
; i
++)
578 dbuf_prefetch(dn
, blkid
+ i
, ZIO_PRIORITY_SYNC_READ
);
581 rw_exit(&dn
->dn_struct_rwlock
);
583 dnode_rele(dn
, FTAG
);
587 * Get the next "chunk" of file data to free. We traverse the file from
588 * the end so that the file gets shorter over time (if we crashes in the
589 * middle, this will leave us in a better state). We find allocated file
590 * data by simply searching the allocated level 1 indirects.
592 * On input, *start should be the first offset that does not need to be
593 * freed (e.g. "offset + length"). On return, *start will be the first
594 * offset that should be freed.
597 get_next_chunk(dnode_t
*dn
, uint64_t *start
, uint64_t minimum
)
599 uint64_t maxblks
= DMU_MAX_ACCESS
>> (dn
->dn_indblkshift
+ 1);
600 /* bytes of data covered by a level-1 indirect block */
602 dn
->dn_datablksz
* EPB(dn
->dn_indblkshift
, SPA_BLKPTRSHIFT
);
604 ASSERT3U(minimum
, <=, *start
);
606 if (*start
- minimum
<= iblkrange
* maxblks
) {
610 ASSERT(ISP2(iblkrange
));
612 for (uint64_t blks
= 0; *start
> minimum
&& blks
< maxblks
; blks
++) {
616 * dnode_next_offset(BACKWARDS) will find an allocated L1
617 * indirect block at or before the input offset. We must
618 * decrement *start so that it is at the end of the region
622 err
= dnode_next_offset(dn
,
623 DNODE_FIND_BACKWARDS
, start
, 2, 1, 0);
625 /* if there are no indirect blocks before start, we are done */
629 } else if (err
!= 0) {
633 /* set start to the beginning of this L1 indirect */
634 *start
= P2ALIGN(*start
, iblkrange
);
636 if (*start
< minimum
)
642 dmu_free_long_range_impl(objset_t
*os
, dnode_t
*dn
, uint64_t offset
,
645 uint64_t object_size
= (dn
->dn_maxblkid
+ 1) * dn
->dn_datablksz
;
648 if (offset
>= object_size
)
651 if (length
== DMU_OBJECT_END
|| offset
+ length
> object_size
)
652 length
= object_size
- offset
;
654 while (length
!= 0) {
655 uint64_t chunk_end
, chunk_begin
;
657 chunk_end
= chunk_begin
= offset
+ length
;
659 /* move chunk_begin backwards to the beginning of this chunk */
660 err
= get_next_chunk(dn
, &chunk_begin
, offset
);
663 ASSERT3U(chunk_begin
, >=, offset
);
664 ASSERT3U(chunk_begin
, <=, chunk_end
);
666 dmu_tx_t
*tx
= dmu_tx_create(os
);
667 dmu_tx_hold_free(tx
, dn
->dn_object
,
668 chunk_begin
, chunk_end
- chunk_begin
);
671 * Mark this transaction as typically resulting in a net
672 * reduction in space used.
674 dmu_tx_mark_netfree(tx
);
675 err
= dmu_tx_assign(tx
, TXG_WAIT
);
680 dnode_free_range(dn
, chunk_begin
, chunk_end
- chunk_begin
, tx
);
683 length
-= chunk_end
- chunk_begin
;
689 dmu_free_long_range(objset_t
*os
, uint64_t object
,
690 uint64_t offset
, uint64_t length
)
695 err
= dnode_hold(os
, object
, FTAG
, &dn
);
698 err
= dmu_free_long_range_impl(os
, dn
, offset
, length
);
701 * It is important to zero out the maxblkid when freeing the entire
702 * file, so that (a) subsequent calls to dmu_free_long_range_impl()
703 * will take the fast path, and (b) dnode_reallocate() can verify
704 * that the entire file has been freed.
706 if (err
== 0 && offset
== 0 && length
== DMU_OBJECT_END
)
709 dnode_rele(dn
, FTAG
);
714 dmu_free_long_object(objset_t
*os
, uint64_t object
)
719 err
= dmu_free_long_range(os
, object
, 0, DMU_OBJECT_END
);
723 tx
= dmu_tx_create(os
);
724 dmu_tx_hold_bonus(tx
, object
);
725 dmu_tx_hold_free(tx
, object
, 0, DMU_OBJECT_END
);
726 dmu_tx_mark_netfree(tx
);
727 err
= dmu_tx_assign(tx
, TXG_WAIT
);
729 err
= dmu_object_free(os
, object
, tx
);
739 dmu_free_range(objset_t
*os
, uint64_t object
, uint64_t offset
,
740 uint64_t size
, dmu_tx_t
*tx
)
743 int err
= dnode_hold(os
, object
, FTAG
, &dn
);
746 ASSERT(offset
< UINT64_MAX
);
747 ASSERT(size
== -1ULL || size
<= UINT64_MAX
- offset
);
748 dnode_free_range(dn
, offset
, size
, tx
);
749 dnode_rele(dn
, FTAG
);
754 dmu_read(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
755 void *buf
, uint32_t flags
)
761 err
= dnode_hold(os
, object
, FTAG
, &dn
);
766 * Deal with odd block sizes, where there can't be data past the first
767 * block. If we ever do the tail block optimization, we will need to
768 * handle that here as well.
770 if (dn
->dn_maxblkid
== 0) {
771 int newsz
= offset
> dn
->dn_datablksz
? 0 :
772 MIN(size
, dn
->dn_datablksz
- offset
);
773 bzero((char *)buf
+ newsz
, size
- newsz
);
778 uint64_t mylen
= MIN(size
, DMU_MAX_ACCESS
/ 2);
782 * NB: we could do this block-at-a-time, but it's nice
783 * to be reading in parallel.
785 err
= dmu_buf_hold_array_by_dnode(dn
, offset
, mylen
,
786 TRUE
, FTAG
, &numbufs
, &dbp
, flags
);
790 for (i
= 0; i
< numbufs
; i
++) {
793 dmu_buf_t
*db
= dbp
[i
];
797 bufoff
= offset
- db
->db_offset
;
798 tocpy
= (int)MIN(db
->db_size
- bufoff
, size
);
800 bcopy((char *)db
->db_data
+ bufoff
, buf
, tocpy
);
804 buf
= (char *)buf
+ tocpy
;
806 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
808 dnode_rele(dn
, FTAG
);
813 dmu_write(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
814 const void *buf
, dmu_tx_t
*tx
)
822 VERIFY(0 == dmu_buf_hold_array(os
, object
, offset
, size
,
823 FALSE
, FTAG
, &numbufs
, &dbp
));
825 for (i
= 0; i
< numbufs
; i
++) {
828 dmu_buf_t
*db
= dbp
[i
];
832 bufoff
= offset
- db
->db_offset
;
833 tocpy
= (int)MIN(db
->db_size
- bufoff
, size
);
835 ASSERT(i
== 0 || i
== numbufs
-1 || tocpy
== db
->db_size
);
837 if (tocpy
== db
->db_size
)
838 dmu_buf_will_fill(db
, tx
);
840 dmu_buf_will_dirty(db
, tx
);
842 bcopy(buf
, (char *)db
->db_data
+ bufoff
, tocpy
);
844 if (tocpy
== db
->db_size
)
845 dmu_buf_fill_done(db
, tx
);
849 buf
= (char *)buf
+ tocpy
;
851 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
855 dmu_prealloc(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
864 VERIFY(0 == dmu_buf_hold_array(os
, object
, offset
, size
,
865 FALSE
, FTAG
, &numbufs
, &dbp
));
867 for (i
= 0; i
< numbufs
; i
++) {
868 dmu_buf_t
*db
= dbp
[i
];
870 dmu_buf_will_not_fill(db
, tx
);
872 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
876 dmu_write_embedded(objset_t
*os
, uint64_t object
, uint64_t offset
,
877 void *data
, uint8_t etype
, uint8_t comp
, int uncompressed_size
,
878 int compressed_size
, int byteorder
, dmu_tx_t
*tx
)
882 ASSERT3U(etype
, <, NUM_BP_EMBEDDED_TYPES
);
883 ASSERT3U(comp
, <, ZIO_COMPRESS_FUNCTIONS
);
884 VERIFY0(dmu_buf_hold_noread(os
, object
, offset
,
887 dmu_buf_write_embedded(db
,
888 data
, (bp_embedded_type_t
)etype
, (enum zio_compress
)comp
,
889 uncompressed_size
, compressed_size
, byteorder
, tx
);
891 dmu_buf_rele(db
, FTAG
);
895 * DMU support for xuio
897 kstat_t
*xuio_ksp
= NULL
;
900 dmu_xuio_init(xuio_t
*xuio
, int nblk
)
903 uio_t
*uio
= &xuio
->xu_uio
;
905 uio
->uio_iovcnt
= nblk
;
906 uio
->uio_iov
= kmem_zalloc(nblk
* sizeof (iovec_t
), KM_SLEEP
);
908 priv
= kmem_zalloc(sizeof (dmu_xuio_t
), KM_SLEEP
);
910 priv
->bufs
= kmem_zalloc(nblk
* sizeof (arc_buf_t
*), KM_SLEEP
);
911 priv
->iovp
= uio
->uio_iov
;
912 XUIO_XUZC_PRIV(xuio
) = priv
;
914 if (XUIO_XUZC_RW(xuio
) == UIO_READ
)
915 XUIOSTAT_INCR(xuiostat_onloan_rbuf
, nblk
);
917 XUIOSTAT_INCR(xuiostat_onloan_wbuf
, nblk
);
923 dmu_xuio_fini(xuio_t
*xuio
)
925 dmu_xuio_t
*priv
= XUIO_XUZC_PRIV(xuio
);
926 int nblk
= priv
->cnt
;
928 kmem_free(priv
->iovp
, nblk
* sizeof (iovec_t
));
929 kmem_free(priv
->bufs
, nblk
* sizeof (arc_buf_t
*));
930 kmem_free(priv
, sizeof (dmu_xuio_t
));
932 if (XUIO_XUZC_RW(xuio
) == UIO_READ
)
933 XUIOSTAT_INCR(xuiostat_onloan_rbuf
, -nblk
);
935 XUIOSTAT_INCR(xuiostat_onloan_wbuf
, -nblk
);
939 * Initialize iov[priv->next] and priv->bufs[priv->next] with { off, n, abuf }
940 * and increase priv->next by 1.
943 dmu_xuio_add(xuio_t
*xuio
, arc_buf_t
*abuf
, offset_t off
, size_t n
)
946 uio_t
*uio
= &xuio
->xu_uio
;
947 dmu_xuio_t
*priv
= XUIO_XUZC_PRIV(xuio
);
948 int i
= priv
->next
++;
950 ASSERT(i
< priv
->cnt
);
951 ASSERT(off
+ n
<= arc_buf_size(abuf
));
952 iov
= uio
->uio_iov
+ i
;
953 iov
->iov_base
= (char *)abuf
->b_data
+ off
;
955 priv
->bufs
[i
] = abuf
;
960 dmu_xuio_cnt(xuio_t
*xuio
)
962 dmu_xuio_t
*priv
= XUIO_XUZC_PRIV(xuio
);
967 dmu_xuio_arcbuf(xuio_t
*xuio
, int i
)
969 dmu_xuio_t
*priv
= XUIO_XUZC_PRIV(xuio
);
971 ASSERT(i
< priv
->cnt
);
972 return (priv
->bufs
[i
]);
976 dmu_xuio_clear(xuio_t
*xuio
, int i
)
978 dmu_xuio_t
*priv
= XUIO_XUZC_PRIV(xuio
);
980 ASSERT(i
< priv
->cnt
);
981 priv
->bufs
[i
] = NULL
;
987 xuio_ksp
= kstat_create("zfs", 0, "xuio_stats", "misc",
988 KSTAT_TYPE_NAMED
, sizeof (xuio_stats
) / sizeof (kstat_named_t
),
990 if (xuio_ksp
!= NULL
) {
991 xuio_ksp
->ks_data
= &xuio_stats
;
992 kstat_install(xuio_ksp
);
999 if (xuio_ksp
!= NULL
) {
1000 kstat_delete(xuio_ksp
);
1006 xuio_stat_wbuf_copied()
1008 XUIOSTAT_BUMP(xuiostat_wbuf_copied
);
1012 xuio_stat_wbuf_nocopy()
1014 XUIOSTAT_BUMP(xuiostat_wbuf_nocopy
);
1019 dmu_read_uio_dnode(dnode_t
*dn
, uio_t
*uio
, uint64_t size
)
1022 int numbufs
, i
, err
;
1023 xuio_t
*xuio
= NULL
;
1026 * NB: we could do this block-at-a-time, but it's nice
1027 * to be reading in parallel.
1029 err
= dmu_buf_hold_array_by_dnode(dn
, uio
->uio_loffset
, size
,
1030 TRUE
, FTAG
, &numbufs
, &dbp
, 0);
1034 if (uio
->uio_extflg
== UIO_XUIO
)
1035 xuio
= (xuio_t
*)uio
;
1037 for (i
= 0; i
< numbufs
; i
++) {
1040 dmu_buf_t
*db
= dbp
[i
];
1044 bufoff
= uio
->uio_loffset
- db
->db_offset
;
1045 tocpy
= (int)MIN(db
->db_size
- bufoff
, size
);
1048 dmu_buf_impl_t
*dbi
= (dmu_buf_impl_t
*)db
;
1049 arc_buf_t
*dbuf_abuf
= dbi
->db_buf
;
1050 arc_buf_t
*abuf
= dbuf_loan_arcbuf(dbi
);
1051 err
= dmu_xuio_add(xuio
, abuf
, bufoff
, tocpy
);
1053 uio
->uio_resid
-= tocpy
;
1054 uio
->uio_loffset
+= tocpy
;
1057 if (abuf
== dbuf_abuf
)
1058 XUIOSTAT_BUMP(xuiostat_rbuf_nocopy
);
1060 XUIOSTAT_BUMP(xuiostat_rbuf_copied
);
1062 err
= uiomove((char *)db
->db_data
+ bufoff
, tocpy
,
1070 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1076 * Read 'size' bytes into the uio buffer.
1077 * From object zdb->db_object.
1078 * Starting at offset uio->uio_loffset.
1080 * If the caller already has a dbuf in the target object
1081 * (e.g. its bonus buffer), this routine is faster than dmu_read_uio(),
1082 * because we don't have to find the dnode_t for the object.
1085 dmu_read_uio_dbuf(dmu_buf_t
*zdb
, uio_t
*uio
, uint64_t size
)
1087 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)zdb
;
1096 err
= dmu_read_uio_dnode(dn
, uio
, size
);
1103 * Read 'size' bytes into the uio buffer.
1104 * From the specified object
1105 * Starting at offset uio->uio_loffset.
1108 dmu_read_uio(objset_t
*os
, uint64_t object
, uio_t
*uio
, uint64_t size
)
1116 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1120 err
= dmu_read_uio_dnode(dn
, uio
, size
);
1122 dnode_rele(dn
, FTAG
);
1128 dmu_write_uio_dnode(dnode_t
*dn
, uio_t
*uio
, uint64_t size
, dmu_tx_t
*tx
)
1135 err
= dmu_buf_hold_array_by_dnode(dn
, uio
->uio_loffset
, size
,
1136 FALSE
, FTAG
, &numbufs
, &dbp
, DMU_READ_PREFETCH
);
1140 for (i
= 0; i
< numbufs
; i
++) {
1143 dmu_buf_t
*db
= dbp
[i
];
1147 bufoff
= uio
->uio_loffset
- db
->db_offset
;
1148 tocpy
= (int)MIN(db
->db_size
- bufoff
, size
);
1150 ASSERT(i
== 0 || i
== numbufs
-1 || tocpy
== db
->db_size
);
1152 if (tocpy
== db
->db_size
)
1153 dmu_buf_will_fill(db
, tx
);
1155 dmu_buf_will_dirty(db
, tx
);
1158 * XXX uiomove could block forever (eg. nfs-backed
1159 * pages). There needs to be a uiolockdown() function
1160 * to lock the pages in memory, so that uiomove won't
1163 err
= uiomove((char *)db
->db_data
+ bufoff
, tocpy
,
1166 if (tocpy
== db
->db_size
)
1167 dmu_buf_fill_done(db
, tx
);
1175 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1180 * Write 'size' bytes from the uio buffer.
1181 * To object zdb->db_object.
1182 * Starting at offset uio->uio_loffset.
1184 * If the caller already has a dbuf in the target object
1185 * (e.g. its bonus buffer), this routine is faster than dmu_write_uio(),
1186 * because we don't have to find the dnode_t for the object.
1189 dmu_write_uio_dbuf(dmu_buf_t
*zdb
, uio_t
*uio
, uint64_t size
,
1192 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)zdb
;
1201 err
= dmu_write_uio_dnode(dn
, uio
, size
, tx
);
1208 * Write 'size' bytes from the uio buffer.
1209 * To the specified object.
1210 * Starting at offset uio->uio_loffset.
1213 dmu_write_uio(objset_t
*os
, uint64_t object
, uio_t
*uio
, uint64_t size
,
1222 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1226 err
= dmu_write_uio_dnode(dn
, uio
, size
, tx
);
1228 dnode_rele(dn
, FTAG
);
1234 dmu_write_pages(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
1235 page_t
*pp
, dmu_tx_t
*tx
)
1244 err
= dmu_buf_hold_array(os
, object
, offset
, size
,
1245 FALSE
, FTAG
, &numbufs
, &dbp
);
1249 for (i
= 0; i
< numbufs
; i
++) {
1250 int tocpy
, copied
, thiscpy
;
1252 dmu_buf_t
*db
= dbp
[i
];
1256 ASSERT3U(db
->db_size
, >=, PAGESIZE
);
1258 bufoff
= offset
- db
->db_offset
;
1259 tocpy
= (int)MIN(db
->db_size
- bufoff
, size
);
1261 ASSERT(i
== 0 || i
== numbufs
-1 || tocpy
== db
->db_size
);
1263 if (tocpy
== db
->db_size
)
1264 dmu_buf_will_fill(db
, tx
);
1266 dmu_buf_will_dirty(db
, tx
);
1268 for (copied
= 0; copied
< tocpy
; copied
+= PAGESIZE
) {
1269 ASSERT3U(pp
->p_offset
, ==, db
->db_offset
+ bufoff
);
1270 thiscpy
= MIN(PAGESIZE
, tocpy
- copied
);
1271 va
= zfs_map_page(pp
, S_READ
);
1272 bcopy(va
, (char *)db
->db_data
+ bufoff
, thiscpy
);
1273 zfs_unmap_page(pp
, va
);
1278 if (tocpy
== db
->db_size
)
1279 dmu_buf_fill_done(db
, tx
);
1284 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1290 * Allocate a loaned anonymous arc buffer.
1293 dmu_request_arcbuf(dmu_buf_t
*handle
, int size
)
1295 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)handle
;
1297 return (arc_loan_buf(db
->db_objset
->os_spa
, size
));
1301 * Free a loaned arc buffer.
1304 dmu_return_arcbuf(arc_buf_t
*buf
)
1306 arc_return_buf(buf
, FTAG
);
1307 VERIFY(arc_buf_remove_ref(buf
, FTAG
));
1311 * When possible directly assign passed loaned arc buffer to a dbuf.
1312 * If this is not possible copy the contents of passed arc buf via
1316 dmu_assign_arcbuf(dmu_buf_t
*handle
, uint64_t offset
, arc_buf_t
*buf
,
1319 dmu_buf_impl_t
*dbuf
= (dmu_buf_impl_t
*)handle
;
1322 uint32_t blksz
= (uint32_t)arc_buf_size(buf
);
1325 DB_DNODE_ENTER(dbuf
);
1326 dn
= DB_DNODE(dbuf
);
1327 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
1328 blkid
= dbuf_whichblock(dn
, offset
);
1329 VERIFY((db
= dbuf_hold(dn
, blkid
, FTAG
)) != NULL
);
1330 rw_exit(&dn
->dn_struct_rwlock
);
1331 DB_DNODE_EXIT(dbuf
);
1334 * We can only assign if the offset is aligned, the arc buf is the
1335 * same size as the dbuf, and the dbuf is not metadata. It
1336 * can't be metadata because the loaned arc buf comes from the
1337 * user-data kmem arena.
1339 if (offset
== db
->db
.db_offset
&& blksz
== db
->db
.db_size
&&
1340 DBUF_GET_BUFC_TYPE(db
) == ARC_BUFC_DATA
) {
1341 dbuf_assign_arcbuf(db
, buf
, tx
);
1342 dbuf_rele(db
, FTAG
);
1347 DB_DNODE_ENTER(dbuf
);
1348 dn
= DB_DNODE(dbuf
);
1350 object
= dn
->dn_object
;
1351 DB_DNODE_EXIT(dbuf
);
1353 dbuf_rele(db
, FTAG
);
1354 dmu_write(os
, object
, offset
, blksz
, buf
->b_data
, tx
);
1355 dmu_return_arcbuf(buf
);
1356 XUIOSTAT_BUMP(xuiostat_wbuf_copied
);
1361 dbuf_dirty_record_t
*dsa_dr
;
1362 dmu_sync_cb_t
*dsa_done
;
1369 dmu_sync_ready(zio_t
*zio
, arc_buf_t
*buf
, void *varg
)
1371 dmu_sync_arg_t
*dsa
= varg
;
1372 dmu_buf_t
*db
= dsa
->dsa_zgd
->zgd_db
;
1373 blkptr_t
*bp
= zio
->io_bp
;
1375 if (zio
->io_error
== 0) {
1376 if (BP_IS_HOLE(bp
)) {
1378 * A block of zeros may compress to a hole, but the
1379 * block size still needs to be known for replay.
1381 BP_SET_LSIZE(bp
, db
->db_size
);
1382 } else if (!BP_IS_EMBEDDED(bp
)) {
1383 ASSERT(BP_GET_LEVEL(bp
) == 0);
1390 dmu_sync_late_arrival_ready(zio_t
*zio
)
1392 dmu_sync_ready(zio
, NULL
, zio
->io_private
);
1397 dmu_sync_done(zio_t
*zio
, arc_buf_t
*buf
, void *varg
)
1399 dmu_sync_arg_t
*dsa
= varg
;
1400 dbuf_dirty_record_t
*dr
= dsa
->dsa_dr
;
1401 dmu_buf_impl_t
*db
= dr
->dr_dbuf
;
1403 mutex_enter(&db
->db_mtx
);
1404 ASSERT(dr
->dt
.dl
.dr_override_state
== DR_IN_DMU_SYNC
);
1405 if (zio
->io_error
== 0) {
1406 dr
->dt
.dl
.dr_nopwrite
= !!(zio
->io_flags
& ZIO_FLAG_NOPWRITE
);
1407 if (dr
->dt
.dl
.dr_nopwrite
) {
1408 blkptr_t
*bp
= zio
->io_bp
;
1409 blkptr_t
*bp_orig
= &zio
->io_bp_orig
;
1410 uint8_t chksum
= BP_GET_CHECKSUM(bp_orig
);
1412 ASSERT(BP_EQUAL(bp
, bp_orig
));
1413 ASSERT(zio
->io_prop
.zp_compress
!= ZIO_COMPRESS_OFF
);
1414 ASSERT(zio_checksum_table
[chksum
].ci_dedup
);
1416 dr
->dt
.dl
.dr_overridden_by
= *zio
->io_bp
;
1417 dr
->dt
.dl
.dr_override_state
= DR_OVERRIDDEN
;
1418 dr
->dt
.dl
.dr_copies
= zio
->io_prop
.zp_copies
;
1419 if (BP_IS_HOLE(&dr
->dt
.dl
.dr_overridden_by
))
1420 BP_ZERO(&dr
->dt
.dl
.dr_overridden_by
);
1422 dr
->dt
.dl
.dr_override_state
= DR_NOT_OVERRIDDEN
;
1424 cv_broadcast(&db
->db_changed
);
1425 mutex_exit(&db
->db_mtx
);
1427 dsa
->dsa_done(dsa
->dsa_zgd
, zio
->io_error
);
1429 kmem_free(dsa
, sizeof (*dsa
));
1433 dmu_sync_late_arrival_done(zio_t
*zio
)
1435 blkptr_t
*bp
= zio
->io_bp
;
1436 dmu_sync_arg_t
*dsa
= zio
->io_private
;
1437 blkptr_t
*bp_orig
= &zio
->io_bp_orig
;
1439 if (zio
->io_error
== 0 && !BP_IS_HOLE(bp
)) {
1441 * If we didn't allocate a new block (i.e. ZIO_FLAG_NOPWRITE)
1442 * then there is nothing to do here. Otherwise, free the
1443 * newly allocated block in this txg.
1445 if (zio
->io_flags
& ZIO_FLAG_NOPWRITE
) {
1446 ASSERT(BP_EQUAL(bp
, bp_orig
));
1448 ASSERT(BP_IS_HOLE(bp_orig
) || !BP_EQUAL(bp
, bp_orig
));
1449 ASSERT(zio
->io_bp
->blk_birth
== zio
->io_txg
);
1450 ASSERT(zio
->io_txg
> spa_syncing_txg(zio
->io_spa
));
1451 zio_free(zio
->io_spa
, zio
->io_txg
, zio
->io_bp
);
1455 dmu_tx_commit(dsa
->dsa_tx
);
1457 dsa
->dsa_done(dsa
->dsa_zgd
, zio
->io_error
);
1459 kmem_free(dsa
, sizeof (*dsa
));
1463 dmu_sync_late_arrival(zio_t
*pio
, objset_t
*os
, dmu_sync_cb_t
*done
, zgd_t
*zgd
,
1464 zio_prop_t
*zp
, zbookmark_phys_t
*zb
)
1466 dmu_sync_arg_t
*dsa
;
1469 tx
= dmu_tx_create(os
);
1470 dmu_tx_hold_space(tx
, zgd
->zgd_db
->db_size
);
1471 if (dmu_tx_assign(tx
, TXG_WAIT
) != 0) {
1473 /* Make zl_get_data do txg_waited_synced() */
1474 return (SET_ERROR(EIO
));
1477 dsa
= kmem_alloc(sizeof (dmu_sync_arg_t
), KM_SLEEP
);
1479 dsa
->dsa_done
= done
;
1483 zio_nowait(zio_write(pio
, os
->os_spa
, dmu_tx_get_txg(tx
), zgd
->zgd_bp
,
1484 zgd
->zgd_db
->db_data
, zgd
->zgd_db
->db_size
, zp
,
1485 dmu_sync_late_arrival_ready
, NULL
, dmu_sync_late_arrival_done
, dsa
,
1486 ZIO_PRIORITY_SYNC_WRITE
, ZIO_FLAG_CANFAIL
, zb
));
1492 * Intent log support: sync the block associated with db to disk.
1493 * N.B. and XXX: the caller is responsible for making sure that the
1494 * data isn't changing while dmu_sync() is writing it.
1498 * EEXIST: this txg has already been synced, so there's nothing to do.
1499 * The caller should not log the write.
1501 * ENOENT: the block was dbuf_free_range()'d, so there's nothing to do.
1502 * The caller should not log the write.
1504 * EALREADY: this block is already in the process of being synced.
1505 * The caller should track its progress (somehow).
1507 * EIO: could not do the I/O.
1508 * The caller should do a txg_wait_synced().
1510 * 0: the I/O has been initiated.
1511 * The caller should log this blkptr in the done callback.
1512 * It is possible that the I/O will fail, in which case
1513 * the error will be reported to the done callback and
1514 * propagated to pio from zio_done().
1517 dmu_sync(zio_t
*pio
, uint64_t txg
, dmu_sync_cb_t
*done
, zgd_t
*zgd
)
1519 blkptr_t
*bp
= zgd
->zgd_bp
;
1520 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)zgd
->zgd_db
;
1521 objset_t
*os
= db
->db_objset
;
1522 dsl_dataset_t
*ds
= os
->os_dsl_dataset
;
1523 dbuf_dirty_record_t
*dr
;
1524 dmu_sync_arg_t
*dsa
;
1525 zbookmark_phys_t zb
;
1529 ASSERT(pio
!= NULL
);
1532 SET_BOOKMARK(&zb
, ds
->ds_object
,
1533 db
->db
.db_object
, db
->db_level
, db
->db_blkid
);
1537 dmu_write_policy(os
, dn
, db
->db_level
, WP_DMU_SYNC
, &zp
);
1541 * If we're frozen (running ziltest), we always need to generate a bp.
1543 if (txg
> spa_freeze_txg(os
->os_spa
))
1544 return (dmu_sync_late_arrival(pio
, os
, done
, zgd
, &zp
, &zb
));
1547 * Grabbing db_mtx now provides a barrier between dbuf_sync_leaf()
1548 * and us. If we determine that this txg is not yet syncing,
1549 * but it begins to sync a moment later, that's OK because the
1550 * sync thread will block in dbuf_sync_leaf() until we drop db_mtx.
1552 mutex_enter(&db
->db_mtx
);
1554 if (txg
<= spa_last_synced_txg(os
->os_spa
)) {
1556 * This txg has already synced. There's nothing to do.
1558 mutex_exit(&db
->db_mtx
);
1559 return (SET_ERROR(EEXIST
));
1562 if (txg
<= spa_syncing_txg(os
->os_spa
)) {
1564 * This txg is currently syncing, so we can't mess with
1565 * the dirty record anymore; just write a new log block.
1567 mutex_exit(&db
->db_mtx
);
1568 return (dmu_sync_late_arrival(pio
, os
, done
, zgd
, &zp
, &zb
));
1571 dr
= db
->db_last_dirty
;
1572 while (dr
&& dr
->dr_txg
!= txg
)
1577 * There's no dr for this dbuf, so it must have been freed.
1578 * There's no need to log writes to freed blocks, so we're done.
1580 mutex_exit(&db
->db_mtx
);
1581 return (SET_ERROR(ENOENT
));
1584 ASSERT(dr
->dr_next
== NULL
|| dr
->dr_next
->dr_txg
< txg
);
1587 * Assume the on-disk data is X, the current syncing data is Y,
1588 * and the current in-memory data is Z (currently in dmu_sync).
1589 * X and Z are identical but Y is has been modified. Normally,
1590 * when X and Z are the same we will perform a nopwrite but if Y
1591 * is different we must disable nopwrite since the resulting write
1592 * of Y to disk can free the block containing X. If we allowed a
1593 * nopwrite to occur the block pointing to Z would reference a freed
1594 * block. Since this is a rare case we simplify this by disabling
1595 * nopwrite if the current dmu_sync-ing dbuf has been modified in
1596 * a previous transaction.
1599 zp
.zp_nopwrite
= B_FALSE
;
1601 ASSERT(dr
->dr_txg
== txg
);
1602 if (dr
->dt
.dl
.dr_override_state
== DR_IN_DMU_SYNC
||
1603 dr
->dt
.dl
.dr_override_state
== DR_OVERRIDDEN
) {
1605 * We have already issued a sync write for this buffer,
1606 * or this buffer has already been synced. It could not
1607 * have been dirtied since, or we would have cleared the state.
1609 mutex_exit(&db
->db_mtx
);
1610 return (SET_ERROR(EALREADY
));
1613 ASSERT(dr
->dt
.dl
.dr_override_state
== DR_NOT_OVERRIDDEN
);
1614 dr
->dt
.dl
.dr_override_state
= DR_IN_DMU_SYNC
;
1615 mutex_exit(&db
->db_mtx
);
1617 dsa
= kmem_alloc(sizeof (dmu_sync_arg_t
), KM_SLEEP
);
1619 dsa
->dsa_done
= done
;
1623 zio_nowait(arc_write(pio
, os
->os_spa
, txg
,
1624 bp
, dr
->dt
.dl
.dr_data
, DBUF_IS_L2CACHEABLE(db
),
1625 DBUF_IS_L2COMPRESSIBLE(db
), &zp
, dmu_sync_ready
,
1626 NULL
, dmu_sync_done
, dsa
, ZIO_PRIORITY_SYNC_WRITE
,
1627 ZIO_FLAG_CANFAIL
, &zb
));
1633 dmu_object_set_blocksize(objset_t
*os
, uint64_t object
, uint64_t size
, int ibs
,
1639 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1642 err
= dnode_set_blksz(dn
, size
, ibs
, tx
);
1643 dnode_rele(dn
, FTAG
);
1648 dmu_object_set_checksum(objset_t
*os
, uint64_t object
, uint8_t checksum
,
1654 * Send streams include each object's checksum function. This
1655 * check ensures that the receiving system can understand the
1656 * checksum function transmitted.
1658 ASSERT3U(checksum
, <, ZIO_CHECKSUM_LEGACY_FUNCTIONS
);
1660 VERIFY0(dnode_hold(os
, object
, FTAG
, &dn
));
1661 ASSERT3U(checksum
, <, ZIO_CHECKSUM_FUNCTIONS
);
1662 dn
->dn_checksum
= checksum
;
1663 dnode_setdirty(dn
, tx
);
1664 dnode_rele(dn
, FTAG
);
1668 dmu_object_set_compress(objset_t
*os
, uint64_t object
, uint8_t compress
,
1674 * Send streams include each object's compression function. This
1675 * check ensures that the receiving system can understand the
1676 * compression function transmitted.
1678 ASSERT3U(compress
, <, ZIO_COMPRESS_LEGACY_FUNCTIONS
);
1680 VERIFY0(dnode_hold(os
, object
, FTAG
, &dn
));
1681 dn
->dn_compress
= compress
;
1682 dnode_setdirty(dn
, tx
);
1683 dnode_rele(dn
, FTAG
);
1686 int zfs_mdcomp_disable
= 0;
1689 * When the "redundant_metadata" property is set to "most", only indirect
1690 * blocks of this level and higher will have an additional ditto block.
1692 int zfs_redundant_metadata_most_ditto_level
= 2;
1695 dmu_write_policy(objset_t
*os
, dnode_t
*dn
, int level
, int wp
, zio_prop_t
*zp
)
1697 dmu_object_type_t type
= dn
? dn
->dn_type
: DMU_OT_OBJSET
;
1698 boolean_t ismd
= (level
> 0 || DMU_OT_IS_METADATA(type
) ||
1700 enum zio_checksum checksum
= os
->os_checksum
;
1701 enum zio_compress compress
= os
->os_compress
;
1702 enum zio_checksum dedup_checksum
= os
->os_dedup_checksum
;
1703 boolean_t dedup
= B_FALSE
;
1704 boolean_t nopwrite
= B_FALSE
;
1705 boolean_t dedup_verify
= os
->os_dedup_verify
;
1706 int copies
= os
->os_copies
;
1709 * We maintain different write policies for each of the following
1712 * 2. preallocated blocks (i.e. level-0 blocks of a dump device)
1713 * 3. all other level 0 blocks
1716 if (zfs_mdcomp_disable
) {
1717 compress
= ZIO_COMPRESS_EMPTY
;
1720 * XXX -- we should design a compression algorithm
1721 * that specializes in arrays of bps.
1723 compress
= zio_compress_select(os
->os_spa
,
1724 ZIO_COMPRESS_ON
, ZIO_COMPRESS_ON
);
1728 * Metadata always gets checksummed. If the data
1729 * checksum is multi-bit correctable, and it's not a
1730 * ZBT-style checksum, then it's suitable for metadata
1731 * as well. Otherwise, the metadata checksum defaults
1734 if (zio_checksum_table
[checksum
].ci_correctable
< 1 ||
1735 zio_checksum_table
[checksum
].ci_eck
)
1736 checksum
= ZIO_CHECKSUM_FLETCHER_4
;
1738 if (os
->os_redundant_metadata
== ZFS_REDUNDANT_METADATA_ALL
||
1739 (os
->os_redundant_metadata
==
1740 ZFS_REDUNDANT_METADATA_MOST
&&
1741 (level
>= zfs_redundant_metadata_most_ditto_level
||
1742 DMU_OT_IS_METADATA(type
) || (wp
& WP_SPILL
))))
1744 } else if (wp
& WP_NOFILL
) {
1748 * If we're writing preallocated blocks, we aren't actually
1749 * writing them so don't set any policy properties. These
1750 * blocks are currently only used by an external subsystem
1751 * outside of zfs (i.e. dump) and not written by the zio
1754 compress
= ZIO_COMPRESS_OFF
;
1755 checksum
= ZIO_CHECKSUM_NOPARITY
;
1757 compress
= zio_compress_select(os
->os_spa
, dn
->dn_compress
,
1760 checksum
= (dedup_checksum
== ZIO_CHECKSUM_OFF
) ?
1761 zio_checksum_select(dn
->dn_checksum
, checksum
) :
1765 * Determine dedup setting. If we are in dmu_sync(),
1766 * we won't actually dedup now because that's all
1767 * done in syncing context; but we do want to use the
1768 * dedup checkum. If the checksum is not strong
1769 * enough to ensure unique signatures, force
1772 if (dedup_checksum
!= ZIO_CHECKSUM_OFF
) {
1773 dedup
= (wp
& WP_DMU_SYNC
) ? B_FALSE
: B_TRUE
;
1774 if (!zio_checksum_table
[checksum
].ci_dedup
)
1775 dedup_verify
= B_TRUE
;
1779 * Enable nopwrite if we have a cryptographically secure
1780 * checksum that has no known collisions (i.e. SHA-256)
1781 * and compression is enabled. We don't enable nopwrite if
1782 * dedup is enabled as the two features are mutually exclusive.
1784 nopwrite
= (!dedup
&& zio_checksum_table
[checksum
].ci_dedup
&&
1785 compress
!= ZIO_COMPRESS_OFF
&& zfs_nopwrite_enabled
);
1788 zp
->zp_checksum
= checksum
;
1789 zp
->zp_compress
= compress
;
1790 zp
->zp_type
= (wp
& WP_SPILL
) ? dn
->dn_bonustype
: type
;
1791 zp
->zp_level
= level
;
1792 zp
->zp_copies
= MIN(copies
, spa_max_replication(os
->os_spa
));
1793 zp
->zp_dedup
= dedup
;
1794 zp
->zp_dedup_verify
= dedup
&& dedup_verify
;
1795 zp
->zp_nopwrite
= nopwrite
;
1799 dmu_offset_next(objset_t
*os
, uint64_t object
, boolean_t hole
, uint64_t *off
)
1804 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1808 * Sync any current changes before
1809 * we go trundling through the block pointers.
1811 for (i
= 0; i
< TXG_SIZE
; i
++) {
1812 if (list_link_active(&dn
->dn_dirty_link
[i
]))
1815 if (i
!= TXG_SIZE
) {
1816 dnode_rele(dn
, FTAG
);
1817 txg_wait_synced(dmu_objset_pool(os
), 0);
1818 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1823 err
= dnode_next_offset(dn
, (hole
? DNODE_FIND_HOLE
: 0), off
, 1, 1, 0);
1824 dnode_rele(dn
, FTAG
);
1830 dmu_object_info_from_dnode(dnode_t
*dn
, dmu_object_info_t
*doi
)
1834 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
1835 mutex_enter(&dn
->dn_mtx
);
1839 doi
->doi_data_block_size
= dn
->dn_datablksz
;
1840 doi
->doi_metadata_block_size
= dn
->dn_indblkshift
?
1841 1ULL << dn
->dn_indblkshift
: 0;
1842 doi
->doi_type
= dn
->dn_type
;
1843 doi
->doi_bonus_type
= dn
->dn_bonustype
;
1844 doi
->doi_bonus_size
= dn
->dn_bonuslen
;
1845 doi
->doi_indirection
= dn
->dn_nlevels
;
1846 doi
->doi_checksum
= dn
->dn_checksum
;
1847 doi
->doi_compress
= dn
->dn_compress
;
1848 doi
->doi_nblkptr
= dn
->dn_nblkptr
;
1849 doi
->doi_physical_blocks_512
= (DN_USED_BYTES(dnp
) + 256) >> 9;
1850 doi
->doi_max_offset
= (dn
->dn_maxblkid
+ 1) * dn
->dn_datablksz
;
1851 doi
->doi_fill_count
= 0;
1852 for (int i
= 0; i
< dnp
->dn_nblkptr
; i
++)
1853 doi
->doi_fill_count
+= BP_GET_FILL(&dnp
->dn_blkptr
[i
]);
1855 mutex_exit(&dn
->dn_mtx
);
1856 rw_exit(&dn
->dn_struct_rwlock
);
1860 * Get information on a DMU object.
1861 * If doi is NULL, just indicates whether the object exists.
1864 dmu_object_info(objset_t
*os
, uint64_t object
, dmu_object_info_t
*doi
)
1867 int err
= dnode_hold(os
, object
, FTAG
, &dn
);
1873 dmu_object_info_from_dnode(dn
, doi
);
1875 dnode_rele(dn
, FTAG
);
1880 * As above, but faster; can be used when you have a held dbuf in hand.
1883 dmu_object_info_from_db(dmu_buf_t
*db_fake
, dmu_object_info_t
*doi
)
1885 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
1888 dmu_object_info_from_dnode(DB_DNODE(db
), doi
);
1893 * Faster still when you only care about the size.
1894 * This is specifically optimized for zfs_getattr().
1897 dmu_object_size_from_db(dmu_buf_t
*db_fake
, uint32_t *blksize
,
1898 u_longlong_t
*nblk512
)
1900 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
1906 *blksize
= dn
->dn_datablksz
;
1907 /* add 1 for dnode space */
1908 *nblk512
= ((DN_USED_BYTES(dn
->dn_phys
) + SPA_MINBLOCKSIZE
/2) >>
1909 SPA_MINBLOCKSHIFT
) + 1;
1914 byteswap_uint64_array(void *vbuf
, size_t size
)
1916 uint64_t *buf
= vbuf
;
1917 size_t count
= size
>> 3;
1920 ASSERT((size
& 7) == 0);
1922 for (i
= 0; i
< count
; i
++)
1923 buf
[i
] = BSWAP_64(buf
[i
]);
1927 byteswap_uint32_array(void *vbuf
, size_t size
)
1929 uint32_t *buf
= vbuf
;
1930 size_t count
= size
>> 2;
1933 ASSERT((size
& 3) == 0);
1935 for (i
= 0; i
< count
; i
++)
1936 buf
[i
] = BSWAP_32(buf
[i
]);
1940 byteswap_uint16_array(void *vbuf
, size_t size
)
1942 uint16_t *buf
= vbuf
;
1943 size_t count
= size
>> 1;
1946 ASSERT((size
& 1) == 0);
1948 for (i
= 0; i
< count
; i
++)
1949 buf
[i
] = BSWAP_16(buf
[i
]);
1954 byteswap_uint8_array(void *vbuf
, size_t size
)
1975 arc_fini(); /* arc depends on l2arc, so arc must go first */