4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2013 by Delphix. All rights reserved.
26 /* Copyright (c) 2013 by Saso Kiselkov. All rights reserved. */
29 #include <sys/dmu_impl.h>
30 #include <sys/dmu_tx.h>
32 #include <sys/dnode.h>
33 #include <sys/zfs_context.h>
34 #include <sys/dmu_objset.h>
35 #include <sys/dmu_traverse.h>
36 #include <sys/dsl_dataset.h>
37 #include <sys/dsl_dir.h>
38 #include <sys/dsl_pool.h>
39 #include <sys/dsl_synctask.h>
40 #include <sys/dsl_prop.h>
41 #include <sys/dmu_zfetch.h>
42 #include <sys/zfs_ioctl.h>
44 #include <sys/zio_checksum.h>
45 #include <sys/zio_compress.h>
48 #include <sys/vmsystm.h>
49 #include <sys/zfs_znode.h>
53 * Enable/disable nopwrite feature.
55 int zfs_nopwrite_enabled
= 1;
57 const dmu_object_type_info_t dmu_ot
[DMU_OT_NUMTYPES
] = {
58 { DMU_BSWAP_UINT8
, TRUE
, "unallocated" },
59 { DMU_BSWAP_ZAP
, TRUE
, "object directory" },
60 { DMU_BSWAP_UINT64
, TRUE
, "object array" },
61 { DMU_BSWAP_UINT8
, TRUE
, "packed nvlist" },
62 { DMU_BSWAP_UINT64
, TRUE
, "packed nvlist size" },
63 { DMU_BSWAP_UINT64
, TRUE
, "bpobj" },
64 { DMU_BSWAP_UINT64
, TRUE
, "bpobj header" },
65 { DMU_BSWAP_UINT64
, TRUE
, "SPA space map header" },
66 { DMU_BSWAP_UINT64
, TRUE
, "SPA space map" },
67 { DMU_BSWAP_UINT64
, TRUE
, "ZIL intent log" },
68 { DMU_BSWAP_DNODE
, TRUE
, "DMU dnode" },
69 { DMU_BSWAP_OBJSET
, TRUE
, "DMU objset" },
70 { DMU_BSWAP_UINT64
, TRUE
, "DSL directory" },
71 { DMU_BSWAP_ZAP
, TRUE
, "DSL directory child map"},
72 { DMU_BSWAP_ZAP
, TRUE
, "DSL dataset snap map" },
73 { DMU_BSWAP_ZAP
, TRUE
, "DSL props" },
74 { DMU_BSWAP_UINT64
, TRUE
, "DSL dataset" },
75 { DMU_BSWAP_ZNODE
, TRUE
, "ZFS znode" },
76 { DMU_BSWAP_OLDACL
, TRUE
, "ZFS V0 ACL" },
77 { DMU_BSWAP_UINT8
, FALSE
, "ZFS plain file" },
78 { DMU_BSWAP_ZAP
, TRUE
, "ZFS directory" },
79 { DMU_BSWAP_ZAP
, TRUE
, "ZFS master node" },
80 { DMU_BSWAP_ZAP
, TRUE
, "ZFS delete queue" },
81 { DMU_BSWAP_UINT8
, FALSE
, "zvol object" },
82 { DMU_BSWAP_ZAP
, TRUE
, "zvol prop" },
83 { DMU_BSWAP_UINT8
, FALSE
, "other uint8[]" },
84 { DMU_BSWAP_UINT64
, FALSE
, "other uint64[]" },
85 { DMU_BSWAP_ZAP
, TRUE
, "other ZAP" },
86 { DMU_BSWAP_ZAP
, TRUE
, "persistent error log" },
87 { DMU_BSWAP_UINT8
, TRUE
, "SPA history" },
88 { DMU_BSWAP_UINT64
, TRUE
, "SPA history offsets" },
89 { DMU_BSWAP_ZAP
, TRUE
, "Pool properties" },
90 { DMU_BSWAP_ZAP
, TRUE
, "DSL permissions" },
91 { DMU_BSWAP_ACL
, TRUE
, "ZFS ACL" },
92 { DMU_BSWAP_UINT8
, TRUE
, "ZFS SYSACL" },
93 { DMU_BSWAP_UINT8
, TRUE
, "FUID table" },
94 { DMU_BSWAP_UINT64
, TRUE
, "FUID table size" },
95 { DMU_BSWAP_ZAP
, TRUE
, "DSL dataset next clones"},
96 { DMU_BSWAP_ZAP
, TRUE
, "scan work queue" },
97 { DMU_BSWAP_ZAP
, TRUE
, "ZFS user/group used" },
98 { DMU_BSWAP_ZAP
, TRUE
, "ZFS user/group quota" },
99 { DMU_BSWAP_ZAP
, TRUE
, "snapshot refcount tags"},
100 { DMU_BSWAP_ZAP
, TRUE
, "DDT ZAP algorithm" },
101 { DMU_BSWAP_ZAP
, TRUE
, "DDT statistics" },
102 { DMU_BSWAP_UINT8
, TRUE
, "System attributes" },
103 { DMU_BSWAP_ZAP
, TRUE
, "SA master node" },
104 { DMU_BSWAP_ZAP
, TRUE
, "SA attr registration" },
105 { DMU_BSWAP_ZAP
, TRUE
, "SA attr layouts" },
106 { DMU_BSWAP_ZAP
, TRUE
, "scan translations" },
107 { DMU_BSWAP_UINT8
, FALSE
, "deduplicated block" },
108 { DMU_BSWAP_ZAP
, TRUE
, "DSL deadlist map" },
109 { DMU_BSWAP_UINT64
, TRUE
, "DSL deadlist map hdr" },
110 { DMU_BSWAP_ZAP
, TRUE
, "DSL dir clones" },
111 { DMU_BSWAP_UINT64
, TRUE
, "bpobj subobj" }
114 const dmu_object_byteswap_info_t dmu_ot_byteswap
[DMU_BSWAP_NUMFUNCS
] = {
115 { byteswap_uint8_array
, "uint8" },
116 { byteswap_uint16_array
, "uint16" },
117 { byteswap_uint32_array
, "uint32" },
118 { byteswap_uint64_array
, "uint64" },
119 { zap_byteswap
, "zap" },
120 { dnode_buf_byteswap
, "dnode" },
121 { dmu_objset_byteswap
, "objset" },
122 { zfs_znode_byteswap
, "znode" },
123 { zfs_oldacl_byteswap
, "oldacl" },
124 { zfs_acl_byteswap
, "acl" }
128 dmu_buf_hold(objset_t
*os
, uint64_t object
, uint64_t offset
,
129 void *tag
, dmu_buf_t
**dbp
, int flags
)
135 int db_flags
= DB_RF_CANFAIL
;
137 if (flags
& DMU_READ_NO_PREFETCH
)
138 db_flags
|= DB_RF_NOPREFETCH
;
140 err
= dnode_hold(os
, object
, FTAG
, &dn
);
143 blkid
= dbuf_whichblock(dn
, offset
);
144 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
145 db
= dbuf_hold(dn
, blkid
, tag
);
146 rw_exit(&dn
->dn_struct_rwlock
);
148 err
= SET_ERROR(EIO
);
150 err
= dbuf_read(db
, NULL
, db_flags
);
157 dnode_rele(dn
, FTAG
);
158 *dbp
= &db
->db
; /* NULL db plus first field offset is NULL */
165 return (DN_MAX_BONUSLEN
);
169 dmu_set_bonus(dmu_buf_t
*db_fake
, int newsize
, dmu_tx_t
*tx
)
171 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
178 if (dn
->dn_bonus
!= db
) {
179 error
= SET_ERROR(EINVAL
);
180 } else if (newsize
< 0 || newsize
> db_fake
->db_size
) {
181 error
= SET_ERROR(EINVAL
);
183 dnode_setbonuslen(dn
, newsize
, tx
);
192 dmu_set_bonustype(dmu_buf_t
*db_fake
, dmu_object_type_t type
, dmu_tx_t
*tx
)
194 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
201 if (!DMU_OT_IS_VALID(type
)) {
202 error
= SET_ERROR(EINVAL
);
203 } else if (dn
->dn_bonus
!= db
) {
204 error
= SET_ERROR(EINVAL
);
206 dnode_setbonus_type(dn
, type
, tx
);
215 dmu_get_bonustype(dmu_buf_t
*db_fake
)
217 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
219 dmu_object_type_t type
;
223 type
= dn
->dn_bonustype
;
230 dmu_rm_spill(objset_t
*os
, uint64_t object
, dmu_tx_t
*tx
)
235 error
= dnode_hold(os
, object
, FTAG
, &dn
);
236 dbuf_rm_spill(dn
, tx
);
237 rw_enter(&dn
->dn_struct_rwlock
, RW_WRITER
);
238 dnode_rm_spill(dn
, tx
);
239 rw_exit(&dn
->dn_struct_rwlock
);
240 dnode_rele(dn
, FTAG
);
245 * returns ENOENT, EIO, or 0.
248 dmu_bonus_hold(objset_t
*os
, uint64_t object
, void *tag
, dmu_buf_t
**dbp
)
254 error
= dnode_hold(os
, object
, FTAG
, &dn
);
258 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
259 if (dn
->dn_bonus
== NULL
) {
260 rw_exit(&dn
->dn_struct_rwlock
);
261 rw_enter(&dn
->dn_struct_rwlock
, RW_WRITER
);
262 if (dn
->dn_bonus
== NULL
)
263 dbuf_create_bonus(dn
);
267 /* as long as the bonus buf is held, the dnode will be held */
268 if (refcount_add(&db
->db_holds
, tag
) == 1) {
269 VERIFY(dnode_add_ref(dn
, db
));
270 (void) atomic_inc_32_nv(&dn
->dn_dbufs_count
);
274 * Wait to drop dn_struct_rwlock until after adding the bonus dbuf's
275 * hold and incrementing the dbuf count to ensure that dnode_move() sees
276 * a dnode hold for every dbuf.
278 rw_exit(&dn
->dn_struct_rwlock
);
280 dnode_rele(dn
, FTAG
);
282 VERIFY(0 == dbuf_read(db
, NULL
, DB_RF_MUST_SUCCEED
| DB_RF_NOPREFETCH
));
289 * returns ENOENT, EIO, or 0.
291 * This interface will allocate a blank spill dbuf when a spill blk
292 * doesn't already exist on the dnode.
294 * if you only want to find an already existing spill db, then
295 * dmu_spill_hold_existing() should be used.
298 dmu_spill_hold_by_dnode(dnode_t
*dn
, uint32_t flags
, void *tag
, dmu_buf_t
**dbp
)
300 dmu_buf_impl_t
*db
= NULL
;
303 if ((flags
& DB_RF_HAVESTRUCT
) == 0)
304 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
306 db
= dbuf_hold(dn
, DMU_SPILL_BLKID
, tag
);
308 if ((flags
& DB_RF_HAVESTRUCT
) == 0)
309 rw_exit(&dn
->dn_struct_rwlock
);
312 err
= dbuf_read(db
, NULL
, flags
);
321 dmu_spill_hold_existing(dmu_buf_t
*bonus
, void *tag
, dmu_buf_t
**dbp
)
323 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)bonus
;
330 if (spa_version(dn
->dn_objset
->os_spa
) < SPA_VERSION_SA
) {
331 err
= SET_ERROR(EINVAL
);
333 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
335 if (!dn
->dn_have_spill
) {
336 err
= SET_ERROR(ENOENT
);
338 err
= dmu_spill_hold_by_dnode(dn
,
339 DB_RF_HAVESTRUCT
| DB_RF_CANFAIL
, tag
, dbp
);
342 rw_exit(&dn
->dn_struct_rwlock
);
350 dmu_spill_hold_by_bonus(dmu_buf_t
*bonus
, void *tag
, dmu_buf_t
**dbp
)
352 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)bonus
;
358 err
= dmu_spill_hold_by_dnode(dn
, DB_RF_CANFAIL
, tag
, dbp
);
365 * Note: longer-term, we should modify all of the dmu_buf_*() interfaces
366 * to take a held dnode rather than <os, object> -- the lookup is wasteful,
367 * and can induce severe lock contention when writing to several files
368 * whose dnodes are in the same block.
371 dmu_buf_hold_array_by_dnode(dnode_t
*dn
, uint64_t offset
, uint64_t length
,
372 int read
, void *tag
, int *numbufsp
, dmu_buf_t
***dbpp
, uint32_t flags
)
374 dsl_pool_t
*dp
= NULL
;
376 uint64_t blkid
, nblks
, i
;
382 ASSERT(length
<= DMU_MAX_ACCESS
);
384 dbuf_flags
= DB_RF_CANFAIL
| DB_RF_NEVERWAIT
| DB_RF_HAVESTRUCT
;
385 if (flags
& DMU_READ_NO_PREFETCH
|| length
> zfetch_array_rd_sz
)
386 dbuf_flags
|= DB_RF_NOPREFETCH
;
388 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
389 if (dn
->dn_datablkshift
) {
390 int blkshift
= dn
->dn_datablkshift
;
391 nblks
= (P2ROUNDUP(offset
+length
, 1ULL<<blkshift
) -
392 P2ALIGN(offset
, 1ULL<<blkshift
)) >> blkshift
;
394 if (offset
+ length
> dn
->dn_datablksz
) {
395 zfs_panic_recover("zfs: accessing past end of object "
396 "%llx/%llx (size=%u access=%llu+%llu)",
397 (longlong_t
)dn
->dn_objset
->
398 os_dsl_dataset
->ds_object
,
399 (longlong_t
)dn
->dn_object
, dn
->dn_datablksz
,
400 (longlong_t
)offset
, (longlong_t
)length
);
401 rw_exit(&dn
->dn_struct_rwlock
);
402 return (SET_ERROR(EIO
));
406 dbp
= kmem_zalloc(sizeof (dmu_buf_t
*) * nblks
, KM_SLEEP
);
408 if (dn
->dn_objset
->os_dsl_dataset
)
409 dp
= dn
->dn_objset
->os_dsl_dataset
->ds_dir
->dd_pool
;
411 zio
= zio_root(dn
->dn_objset
->os_spa
, NULL
, NULL
, ZIO_FLAG_CANFAIL
);
412 blkid
= dbuf_whichblock(dn
, offset
);
413 for (i
= 0; i
< nblks
; i
++) {
414 dmu_buf_impl_t
*db
= dbuf_hold(dn
, blkid
+i
, tag
);
416 rw_exit(&dn
->dn_struct_rwlock
);
417 dmu_buf_rele_array(dbp
, nblks
, tag
);
419 return (SET_ERROR(EIO
));
421 /* initiate async i/o */
423 (void) dbuf_read(db
, zio
, dbuf_flags
);
427 rw_exit(&dn
->dn_struct_rwlock
);
429 /* wait for async i/o */
431 /* track read overhead when we are in sync context */
432 if (dp
&& dsl_pool_sync_context(dp
))
433 dp
->dp_read_overhead
+= gethrtime() - start
;
435 dmu_buf_rele_array(dbp
, nblks
, tag
);
439 /* wait for other io to complete */
441 for (i
= 0; i
< nblks
; i
++) {
442 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)dbp
[i
];
443 mutex_enter(&db
->db_mtx
);
444 while (db
->db_state
== DB_READ
||
445 db
->db_state
== DB_FILL
)
446 cv_wait(&db
->db_changed
, &db
->db_mtx
);
447 if (db
->db_state
== DB_UNCACHED
)
448 err
= SET_ERROR(EIO
);
449 mutex_exit(&db
->db_mtx
);
451 dmu_buf_rele_array(dbp
, nblks
, tag
);
463 dmu_buf_hold_array(objset_t
*os
, uint64_t object
, uint64_t offset
,
464 uint64_t length
, int read
, void *tag
, int *numbufsp
, dmu_buf_t
***dbpp
)
469 err
= dnode_hold(os
, object
, FTAG
, &dn
);
473 err
= dmu_buf_hold_array_by_dnode(dn
, offset
, length
, read
, tag
,
474 numbufsp
, dbpp
, DMU_READ_PREFETCH
);
476 dnode_rele(dn
, FTAG
);
482 dmu_buf_hold_array_by_bonus(dmu_buf_t
*db_fake
, uint64_t offset
,
483 uint64_t length
, int read
, void *tag
, int *numbufsp
, dmu_buf_t
***dbpp
)
485 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
491 err
= dmu_buf_hold_array_by_dnode(dn
, offset
, length
, read
, tag
,
492 numbufsp
, dbpp
, DMU_READ_PREFETCH
);
499 dmu_buf_rele_array(dmu_buf_t
**dbp_fake
, int numbufs
, void *tag
)
502 dmu_buf_impl_t
**dbp
= (dmu_buf_impl_t
**)dbp_fake
;
507 for (i
= 0; i
< numbufs
; i
++) {
509 dbuf_rele(dbp
[i
], tag
);
512 kmem_free(dbp
, sizeof (dmu_buf_t
*) * numbufs
);
516 dmu_prefetch(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t len
)
522 if (zfs_prefetch_disable
)
525 if (len
== 0) { /* they're interested in the bonus buffer */
526 dn
= DMU_META_DNODE(os
);
528 if (object
== 0 || object
>= DN_MAX_OBJECT
)
531 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
532 blkid
= dbuf_whichblock(dn
, object
* sizeof (dnode_phys_t
));
533 dbuf_prefetch(dn
, blkid
);
534 rw_exit(&dn
->dn_struct_rwlock
);
539 * XXX - Note, if the dnode for the requested object is not
540 * already cached, we will do a *synchronous* read in the
541 * dnode_hold() call. The same is true for any indirects.
543 err
= dnode_hold(os
, object
, FTAG
, &dn
);
547 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
548 if (dn
->dn_datablkshift
) {
549 int blkshift
= dn
->dn_datablkshift
;
550 nblks
= (P2ROUNDUP(offset
+len
, 1<<blkshift
) -
551 P2ALIGN(offset
, 1<<blkshift
)) >> blkshift
;
553 nblks
= (offset
< dn
->dn_datablksz
);
557 blkid
= dbuf_whichblock(dn
, offset
);
558 for (i
= 0; i
< nblks
; i
++)
559 dbuf_prefetch(dn
, blkid
+i
);
562 rw_exit(&dn
->dn_struct_rwlock
);
564 dnode_rele(dn
, FTAG
);
568 * Get the next "chunk" of file data to free. We traverse the file from
569 * the end so that the file gets shorter over time (if we crashes in the
570 * middle, this will leave us in a better state). We find allocated file
571 * data by simply searching the allocated level 1 indirects.
574 get_next_chunk(dnode_t
*dn
, uint64_t *start
, uint64_t limit
)
576 uint64_t len
= *start
- limit
;
578 uint64_t maxblks
= DMU_MAX_ACCESS
/ (1ULL << (dn
->dn_indblkshift
+ 1));
580 dn
->dn_datablksz
* EPB(dn
->dn_indblkshift
, SPA_BLKPTRSHIFT
);
582 ASSERT(limit
<= *start
);
584 if (len
<= iblkrange
* maxblks
) {
588 ASSERT(ISP2(iblkrange
));
590 while (*start
> limit
&& blkcnt
< maxblks
) {
593 /* find next allocated L1 indirect */
594 err
= dnode_next_offset(dn
,
595 DNODE_FIND_BACKWARDS
, start
, 2, 1, 0);
597 /* if there are no more, then we are done */
606 /* reset offset to end of "next" block back */
607 *start
= P2ALIGN(*start
, iblkrange
);
617 dmu_free_long_range_impl(objset_t
*os
, dnode_t
*dn
, uint64_t offset
,
618 uint64_t length
, boolean_t free_dnode
)
621 uint64_t object_size
, start
, end
, len
;
622 boolean_t trunc
= (length
== DMU_OBJECT_END
);
625 align
= 1 << dn
->dn_datablkshift
;
627 object_size
= align
== 1 ? dn
->dn_datablksz
:
628 (dn
->dn_maxblkid
+ 1) << dn
->dn_datablkshift
;
630 end
= offset
+ length
;
631 if (trunc
|| end
> object_size
)
635 length
= end
- offset
;
639 /* assert(offset <= start) */
640 err
= get_next_chunk(dn
, &start
, offset
);
643 len
= trunc
? DMU_OBJECT_END
: end
- start
;
645 tx
= dmu_tx_create(os
);
646 dmu_tx_hold_free(tx
, dn
->dn_object
, start
, len
);
647 err
= dmu_tx_assign(tx
, TXG_WAIT
);
653 dnode_free_range(dn
, start
, trunc
? -1 : len
, tx
);
655 if (start
== 0 && free_dnode
) {
660 length
-= end
- start
;
669 dmu_free_long_range(objset_t
*os
, uint64_t object
,
670 uint64_t offset
, uint64_t length
)
675 err
= dnode_hold(os
, object
, FTAG
, &dn
);
678 err
= dmu_free_long_range_impl(os
, dn
, offset
, length
, FALSE
);
679 dnode_rele(dn
, FTAG
);
684 dmu_free_object(objset_t
*os
, uint64_t object
)
690 err
= dnode_hold_impl(os
, object
, DNODE_MUST_BE_ALLOCATED
,
694 if (dn
->dn_nlevels
== 1) {
695 tx
= dmu_tx_create(os
);
696 dmu_tx_hold_bonus(tx
, object
);
697 dmu_tx_hold_free(tx
, dn
->dn_object
, 0, DMU_OBJECT_END
);
698 err
= dmu_tx_assign(tx
, TXG_WAIT
);
700 dnode_free_range(dn
, 0, DMU_OBJECT_END
, tx
);
707 err
= dmu_free_long_range_impl(os
, dn
, 0, DMU_OBJECT_END
, TRUE
);
709 dnode_rele(dn
, FTAG
);
714 dmu_free_range(objset_t
*os
, uint64_t object
, uint64_t offset
,
715 uint64_t size
, dmu_tx_t
*tx
)
718 int err
= dnode_hold(os
, object
, FTAG
, &dn
);
721 ASSERT(offset
< UINT64_MAX
);
722 ASSERT(size
== -1ULL || size
<= UINT64_MAX
- offset
);
723 dnode_free_range(dn
, offset
, size
, tx
);
724 dnode_rele(dn
, FTAG
);
729 dmu_read(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
730 void *buf
, uint32_t flags
)
736 err
= dnode_hold(os
, object
, FTAG
, &dn
);
741 * Deal with odd block sizes, where there can't be data past the first
742 * block. If we ever do the tail block optimization, we will need to
743 * handle that here as well.
745 if (dn
->dn_maxblkid
== 0) {
746 int newsz
= offset
> dn
->dn_datablksz
? 0 :
747 MIN(size
, dn
->dn_datablksz
- offset
);
748 bzero((char *)buf
+ newsz
, size
- newsz
);
753 uint64_t mylen
= MIN(size
, DMU_MAX_ACCESS
/ 2);
757 * NB: we could do this block-at-a-time, but it's nice
758 * to be reading in parallel.
760 err
= dmu_buf_hold_array_by_dnode(dn
, offset
, mylen
,
761 TRUE
, FTAG
, &numbufs
, &dbp
, flags
);
765 for (i
= 0; i
< numbufs
; i
++) {
768 dmu_buf_t
*db
= dbp
[i
];
772 bufoff
= offset
- db
->db_offset
;
773 tocpy
= (int)MIN(db
->db_size
- bufoff
, size
);
775 bcopy((char *)db
->db_data
+ bufoff
, buf
, tocpy
);
779 buf
= (char *)buf
+ tocpy
;
781 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
783 dnode_rele(dn
, FTAG
);
788 dmu_write(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
789 const void *buf
, dmu_tx_t
*tx
)
797 VERIFY(0 == dmu_buf_hold_array(os
, object
, offset
, size
,
798 FALSE
, FTAG
, &numbufs
, &dbp
));
800 for (i
= 0; i
< numbufs
; i
++) {
803 dmu_buf_t
*db
= dbp
[i
];
807 bufoff
= offset
- db
->db_offset
;
808 tocpy
= (int)MIN(db
->db_size
- bufoff
, size
);
810 ASSERT(i
== 0 || i
== numbufs
-1 || tocpy
== db
->db_size
);
812 if (tocpy
== db
->db_size
)
813 dmu_buf_will_fill(db
, tx
);
815 dmu_buf_will_dirty(db
, tx
);
817 bcopy(buf
, (char *)db
->db_data
+ bufoff
, tocpy
);
819 if (tocpy
== db
->db_size
)
820 dmu_buf_fill_done(db
, tx
);
824 buf
= (char *)buf
+ tocpy
;
826 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
830 dmu_prealloc(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
839 VERIFY(0 == dmu_buf_hold_array(os
, object
, offset
, size
,
840 FALSE
, FTAG
, &numbufs
, &dbp
));
842 for (i
= 0; i
< numbufs
; i
++) {
843 dmu_buf_t
*db
= dbp
[i
];
845 dmu_buf_will_not_fill(db
, tx
);
847 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
851 * DMU support for xuio
853 kstat_t
*xuio_ksp
= NULL
;
856 dmu_xuio_init(xuio_t
*xuio
, int nblk
)
859 uio_t
*uio
= &xuio
->xu_uio
;
861 uio
->uio_iovcnt
= nblk
;
862 uio
->uio_iov
= kmem_zalloc(nblk
* sizeof (iovec_t
), KM_SLEEP
);
864 priv
= kmem_zalloc(sizeof (dmu_xuio_t
), KM_SLEEP
);
866 priv
->bufs
= kmem_zalloc(nblk
* sizeof (arc_buf_t
*), KM_SLEEP
);
867 priv
->iovp
= uio
->uio_iov
;
868 XUIO_XUZC_PRIV(xuio
) = priv
;
870 if (XUIO_XUZC_RW(xuio
) == UIO_READ
)
871 XUIOSTAT_INCR(xuiostat_onloan_rbuf
, nblk
);
873 XUIOSTAT_INCR(xuiostat_onloan_wbuf
, nblk
);
879 dmu_xuio_fini(xuio_t
*xuio
)
881 dmu_xuio_t
*priv
= XUIO_XUZC_PRIV(xuio
);
882 int nblk
= priv
->cnt
;
884 kmem_free(priv
->iovp
, nblk
* sizeof (iovec_t
));
885 kmem_free(priv
->bufs
, nblk
* sizeof (arc_buf_t
*));
886 kmem_free(priv
, sizeof (dmu_xuio_t
));
888 if (XUIO_XUZC_RW(xuio
) == UIO_READ
)
889 XUIOSTAT_INCR(xuiostat_onloan_rbuf
, -nblk
);
891 XUIOSTAT_INCR(xuiostat_onloan_wbuf
, -nblk
);
895 * Initialize iov[priv->next] and priv->bufs[priv->next] with { off, n, abuf }
896 * and increase priv->next by 1.
899 dmu_xuio_add(xuio_t
*xuio
, arc_buf_t
*abuf
, offset_t off
, size_t n
)
902 uio_t
*uio
= &xuio
->xu_uio
;
903 dmu_xuio_t
*priv
= XUIO_XUZC_PRIV(xuio
);
904 int i
= priv
->next
++;
906 ASSERT(i
< priv
->cnt
);
907 ASSERT(off
+ n
<= arc_buf_size(abuf
));
908 iov
= uio
->uio_iov
+ i
;
909 iov
->iov_base
= (char *)abuf
->b_data
+ off
;
911 priv
->bufs
[i
] = abuf
;
916 dmu_xuio_cnt(xuio_t
*xuio
)
918 dmu_xuio_t
*priv
= XUIO_XUZC_PRIV(xuio
);
923 dmu_xuio_arcbuf(xuio_t
*xuio
, int i
)
925 dmu_xuio_t
*priv
= XUIO_XUZC_PRIV(xuio
);
927 ASSERT(i
< priv
->cnt
);
928 return (priv
->bufs
[i
]);
932 dmu_xuio_clear(xuio_t
*xuio
, int i
)
934 dmu_xuio_t
*priv
= XUIO_XUZC_PRIV(xuio
);
936 ASSERT(i
< priv
->cnt
);
937 priv
->bufs
[i
] = NULL
;
943 xuio_ksp
= kstat_create("zfs", 0, "xuio_stats", "misc",
944 KSTAT_TYPE_NAMED
, sizeof (xuio_stats
) / sizeof (kstat_named_t
),
946 if (xuio_ksp
!= NULL
) {
947 xuio_ksp
->ks_data
= &xuio_stats
;
948 kstat_install(xuio_ksp
);
955 if (xuio_ksp
!= NULL
) {
956 kstat_delete(xuio_ksp
);
962 xuio_stat_wbuf_copied()
964 XUIOSTAT_BUMP(xuiostat_wbuf_copied
);
968 xuio_stat_wbuf_nocopy()
970 XUIOSTAT_BUMP(xuiostat_wbuf_nocopy
);
975 dmu_read_uio(objset_t
*os
, uint64_t object
, uio_t
*uio
, uint64_t size
)
982 * NB: we could do this block-at-a-time, but it's nice
983 * to be reading in parallel.
985 err
= dmu_buf_hold_array(os
, object
, uio
->uio_loffset
, size
, TRUE
, FTAG
,
990 if (uio
->uio_extflg
== UIO_XUIO
)
991 xuio
= (xuio_t
*)uio
;
993 for (i
= 0; i
< numbufs
; i
++) {
996 dmu_buf_t
*db
= dbp
[i
];
1000 bufoff
= uio
->uio_loffset
- db
->db_offset
;
1001 tocpy
= (int)MIN(db
->db_size
- bufoff
, size
);
1004 dmu_buf_impl_t
*dbi
= (dmu_buf_impl_t
*)db
;
1005 arc_buf_t
*dbuf_abuf
= dbi
->db_buf
;
1006 arc_buf_t
*abuf
= dbuf_loan_arcbuf(dbi
);
1007 err
= dmu_xuio_add(xuio
, abuf
, bufoff
, tocpy
);
1009 uio
->uio_resid
-= tocpy
;
1010 uio
->uio_loffset
+= tocpy
;
1013 if (abuf
== dbuf_abuf
)
1014 XUIOSTAT_BUMP(xuiostat_rbuf_nocopy
);
1016 XUIOSTAT_BUMP(xuiostat_rbuf_copied
);
1018 err
= uiomove((char *)db
->db_data
+ bufoff
, tocpy
,
1026 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1032 dmu_write_uio_dnode(dnode_t
*dn
, uio_t
*uio
, uint64_t size
, dmu_tx_t
*tx
)
1039 err
= dmu_buf_hold_array_by_dnode(dn
, uio
->uio_loffset
, size
,
1040 FALSE
, FTAG
, &numbufs
, &dbp
, DMU_READ_PREFETCH
);
1044 for (i
= 0; i
< numbufs
; i
++) {
1047 dmu_buf_t
*db
= dbp
[i
];
1051 bufoff
= uio
->uio_loffset
- db
->db_offset
;
1052 tocpy
= (int)MIN(db
->db_size
- bufoff
, size
);
1054 ASSERT(i
== 0 || i
== numbufs
-1 || tocpy
== db
->db_size
);
1056 if (tocpy
== db
->db_size
)
1057 dmu_buf_will_fill(db
, tx
);
1059 dmu_buf_will_dirty(db
, tx
);
1062 * XXX uiomove could block forever (eg. nfs-backed
1063 * pages). There needs to be a uiolockdown() function
1064 * to lock the pages in memory, so that uiomove won't
1067 err
= uiomove((char *)db
->db_data
+ bufoff
, tocpy
,
1070 if (tocpy
== db
->db_size
)
1071 dmu_buf_fill_done(db
, tx
);
1079 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1084 dmu_write_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_write_uio_dnode(dn
, uio
, size
, tx
);
1103 dmu_write_uio(objset_t
*os
, uint64_t object
, uio_t
*uio
, uint64_t size
,
1112 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1116 err
= dmu_write_uio_dnode(dn
, uio
, size
, tx
);
1118 dnode_rele(dn
, FTAG
);
1124 dmu_write_pages(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
1125 page_t
*pp
, dmu_tx_t
*tx
)
1134 err
= dmu_buf_hold_array(os
, object
, offset
, size
,
1135 FALSE
, FTAG
, &numbufs
, &dbp
);
1139 for (i
= 0; i
< numbufs
; i
++) {
1140 int tocpy
, copied
, thiscpy
;
1142 dmu_buf_t
*db
= dbp
[i
];
1146 ASSERT3U(db
->db_size
, >=, PAGESIZE
);
1148 bufoff
= offset
- db
->db_offset
;
1149 tocpy
= (int)MIN(db
->db_size
- bufoff
, size
);
1151 ASSERT(i
== 0 || i
== numbufs
-1 || tocpy
== db
->db_size
);
1153 if (tocpy
== db
->db_size
)
1154 dmu_buf_will_fill(db
, tx
);
1156 dmu_buf_will_dirty(db
, tx
);
1158 for (copied
= 0; copied
< tocpy
; copied
+= PAGESIZE
) {
1159 ASSERT3U(pp
->p_offset
, ==, db
->db_offset
+ bufoff
);
1160 thiscpy
= MIN(PAGESIZE
, tocpy
- copied
);
1161 va
= zfs_map_page(pp
, S_READ
);
1162 bcopy(va
, (char *)db
->db_data
+ bufoff
, thiscpy
);
1163 zfs_unmap_page(pp
, va
);
1168 if (tocpy
== db
->db_size
)
1169 dmu_buf_fill_done(db
, tx
);
1174 dmu_buf_rele_array(dbp
, numbufs
, FTAG
);
1180 * Allocate a loaned anonymous arc buffer.
1183 dmu_request_arcbuf(dmu_buf_t
*handle
, int size
)
1185 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)handle
;
1188 DB_GET_SPA(&spa
, db
);
1189 return (arc_loan_buf(spa
, size
));
1193 * Free a loaned arc buffer.
1196 dmu_return_arcbuf(arc_buf_t
*buf
)
1198 arc_return_buf(buf
, FTAG
);
1199 VERIFY(arc_buf_remove_ref(buf
, FTAG
));
1203 * When possible directly assign passed loaned arc buffer to a dbuf.
1204 * If this is not possible copy the contents of passed arc buf via
1208 dmu_assign_arcbuf(dmu_buf_t
*handle
, uint64_t offset
, arc_buf_t
*buf
,
1211 dmu_buf_impl_t
*dbuf
= (dmu_buf_impl_t
*)handle
;
1214 uint32_t blksz
= (uint32_t)arc_buf_size(buf
);
1217 DB_DNODE_ENTER(dbuf
);
1218 dn
= DB_DNODE(dbuf
);
1219 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
1220 blkid
= dbuf_whichblock(dn
, offset
);
1221 VERIFY((db
= dbuf_hold(dn
, blkid
, FTAG
)) != NULL
);
1222 rw_exit(&dn
->dn_struct_rwlock
);
1223 DB_DNODE_EXIT(dbuf
);
1225 if (offset
== db
->db
.db_offset
&& blksz
== db
->db
.db_size
) {
1226 dbuf_assign_arcbuf(db
, buf
, tx
);
1227 dbuf_rele(db
, FTAG
);
1232 DB_DNODE_ENTER(dbuf
);
1233 dn
= DB_DNODE(dbuf
);
1235 object
= dn
->dn_object
;
1236 DB_DNODE_EXIT(dbuf
);
1238 dbuf_rele(db
, FTAG
);
1239 dmu_write(os
, object
, offset
, blksz
, buf
->b_data
, tx
);
1240 dmu_return_arcbuf(buf
);
1241 XUIOSTAT_BUMP(xuiostat_wbuf_copied
);
1246 dbuf_dirty_record_t
*dsa_dr
;
1247 dmu_sync_cb_t
*dsa_done
;
1254 dmu_sync_ready(zio_t
*zio
, arc_buf_t
*buf
, void *varg
)
1256 dmu_sync_arg_t
*dsa
= varg
;
1257 dmu_buf_t
*db
= dsa
->dsa_zgd
->zgd_db
;
1258 blkptr_t
*bp
= zio
->io_bp
;
1260 if (zio
->io_error
== 0) {
1261 if (BP_IS_HOLE(bp
)) {
1263 * A block of zeros may compress to a hole, but the
1264 * block size still needs to be known for replay.
1266 BP_SET_LSIZE(bp
, db
->db_size
);
1268 ASSERT(BP_GET_LEVEL(bp
) == 0);
1275 dmu_sync_late_arrival_ready(zio_t
*zio
)
1277 dmu_sync_ready(zio
, NULL
, zio
->io_private
);
1282 dmu_sync_done(zio_t
*zio
, arc_buf_t
*buf
, void *varg
)
1284 dmu_sync_arg_t
*dsa
= varg
;
1285 dbuf_dirty_record_t
*dr
= dsa
->dsa_dr
;
1286 dmu_buf_impl_t
*db
= dr
->dr_dbuf
;
1288 mutex_enter(&db
->db_mtx
);
1289 ASSERT(dr
->dt
.dl
.dr_override_state
== DR_IN_DMU_SYNC
);
1290 if (zio
->io_error
== 0) {
1291 dr
->dt
.dl
.dr_nopwrite
= !!(zio
->io_flags
& ZIO_FLAG_NOPWRITE
);
1292 if (dr
->dt
.dl
.dr_nopwrite
) {
1293 blkptr_t
*bp
= zio
->io_bp
;
1294 blkptr_t
*bp_orig
= &zio
->io_bp_orig
;
1295 uint8_t chksum
= BP_GET_CHECKSUM(bp_orig
);
1297 ASSERT(BP_EQUAL(bp
, bp_orig
));
1298 ASSERT(zio
->io_prop
.zp_compress
!= ZIO_COMPRESS_OFF
);
1299 ASSERT(zio_checksum_table
[chksum
].ci_dedup
);
1301 dr
->dt
.dl
.dr_overridden_by
= *zio
->io_bp
;
1302 dr
->dt
.dl
.dr_override_state
= DR_OVERRIDDEN
;
1303 dr
->dt
.dl
.dr_copies
= zio
->io_prop
.zp_copies
;
1304 if (BP_IS_HOLE(&dr
->dt
.dl
.dr_overridden_by
))
1305 BP_ZERO(&dr
->dt
.dl
.dr_overridden_by
);
1307 dr
->dt
.dl
.dr_override_state
= DR_NOT_OVERRIDDEN
;
1309 cv_broadcast(&db
->db_changed
);
1310 mutex_exit(&db
->db_mtx
);
1312 dsa
->dsa_done(dsa
->dsa_zgd
, zio
->io_error
);
1314 kmem_free(dsa
, sizeof (*dsa
));
1318 dmu_sync_late_arrival_done(zio_t
*zio
)
1320 blkptr_t
*bp
= zio
->io_bp
;
1321 dmu_sync_arg_t
*dsa
= zio
->io_private
;
1322 blkptr_t
*bp_orig
= &zio
->io_bp_orig
;
1324 if (zio
->io_error
== 0 && !BP_IS_HOLE(bp
)) {
1326 * If we didn't allocate a new block (i.e. ZIO_FLAG_NOPWRITE)
1327 * then there is nothing to do here. Otherwise, free the
1328 * newly allocated block in this txg.
1330 if (zio
->io_flags
& ZIO_FLAG_NOPWRITE
) {
1331 ASSERT(BP_EQUAL(bp
, bp_orig
));
1333 ASSERT(BP_IS_HOLE(bp_orig
) || !BP_EQUAL(bp
, bp_orig
));
1334 ASSERT(zio
->io_bp
->blk_birth
== zio
->io_txg
);
1335 ASSERT(zio
->io_txg
> spa_syncing_txg(zio
->io_spa
));
1336 zio_free(zio
->io_spa
, zio
->io_txg
, zio
->io_bp
);
1340 dmu_tx_commit(dsa
->dsa_tx
);
1342 dsa
->dsa_done(dsa
->dsa_zgd
, zio
->io_error
);
1344 kmem_free(dsa
, sizeof (*dsa
));
1348 dmu_sync_late_arrival(zio_t
*pio
, objset_t
*os
, dmu_sync_cb_t
*done
, zgd_t
*zgd
,
1349 zio_prop_t
*zp
, zbookmark_t
*zb
)
1351 dmu_sync_arg_t
*dsa
;
1354 tx
= dmu_tx_create(os
);
1355 dmu_tx_hold_space(tx
, zgd
->zgd_db
->db_size
);
1356 if (dmu_tx_assign(tx
, TXG_WAIT
) != 0) {
1358 /* Make zl_get_data do txg_waited_synced() */
1359 return (SET_ERROR(EIO
));
1362 dsa
= kmem_alloc(sizeof (dmu_sync_arg_t
), KM_SLEEP
);
1364 dsa
->dsa_done
= done
;
1368 zio_nowait(zio_write(pio
, os
->os_spa
, dmu_tx_get_txg(tx
), zgd
->zgd_bp
,
1369 zgd
->zgd_db
->db_data
, zgd
->zgd_db
->db_size
, zp
,
1370 dmu_sync_late_arrival_ready
, dmu_sync_late_arrival_done
, dsa
,
1371 ZIO_PRIORITY_SYNC_WRITE
, ZIO_FLAG_CANFAIL
, zb
));
1377 * Intent log support: sync the block associated with db to disk.
1378 * N.B. and XXX: the caller is responsible for making sure that the
1379 * data isn't changing while dmu_sync() is writing it.
1383 * EEXIST: this txg has already been synced, so there's nothing to do.
1384 * The caller should not log the write.
1386 * ENOENT: the block was dbuf_free_range()'d, so there's nothing to do.
1387 * The caller should not log the write.
1389 * EALREADY: this block is already in the process of being synced.
1390 * The caller should track its progress (somehow).
1392 * EIO: could not do the I/O.
1393 * The caller should do a txg_wait_synced().
1395 * 0: the I/O has been initiated.
1396 * The caller should log this blkptr in the done callback.
1397 * It is possible that the I/O will fail, in which case
1398 * the error will be reported to the done callback and
1399 * propagated to pio from zio_done().
1402 dmu_sync(zio_t
*pio
, uint64_t txg
, dmu_sync_cb_t
*done
, zgd_t
*zgd
)
1404 blkptr_t
*bp
= zgd
->zgd_bp
;
1405 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)zgd
->zgd_db
;
1406 objset_t
*os
= db
->db_objset
;
1407 dsl_dataset_t
*ds
= os
->os_dsl_dataset
;
1408 dbuf_dirty_record_t
*dr
;
1409 dmu_sync_arg_t
*dsa
;
1414 ASSERT(pio
!= NULL
);
1417 SET_BOOKMARK(&zb
, ds
->ds_object
,
1418 db
->db
.db_object
, db
->db_level
, db
->db_blkid
);
1422 dmu_write_policy(os
, dn
, db
->db_level
, WP_DMU_SYNC
, &zp
);
1426 * If we're frozen (running ziltest), we always need to generate a bp.
1428 if (txg
> spa_freeze_txg(os
->os_spa
))
1429 return (dmu_sync_late_arrival(pio
, os
, done
, zgd
, &zp
, &zb
));
1432 * Grabbing db_mtx now provides a barrier between dbuf_sync_leaf()
1433 * and us. If we determine that this txg is not yet syncing,
1434 * but it begins to sync a moment later, that's OK because the
1435 * sync thread will block in dbuf_sync_leaf() until we drop db_mtx.
1437 mutex_enter(&db
->db_mtx
);
1439 if (txg
<= spa_last_synced_txg(os
->os_spa
)) {
1441 * This txg has already synced. There's nothing to do.
1443 mutex_exit(&db
->db_mtx
);
1444 return (SET_ERROR(EEXIST
));
1447 if (txg
<= spa_syncing_txg(os
->os_spa
)) {
1449 * This txg is currently syncing, so we can't mess with
1450 * the dirty record anymore; just write a new log block.
1452 mutex_exit(&db
->db_mtx
);
1453 return (dmu_sync_late_arrival(pio
, os
, done
, zgd
, &zp
, &zb
));
1456 dr
= db
->db_last_dirty
;
1457 while (dr
&& dr
->dr_txg
!= txg
)
1462 * There's no dr for this dbuf, so it must have been freed.
1463 * There's no need to log writes to freed blocks, so we're done.
1465 mutex_exit(&db
->db_mtx
);
1466 return (SET_ERROR(ENOENT
));
1469 ASSERT(dr
->dr_next
== NULL
|| dr
->dr_next
->dr_txg
< txg
);
1472 * Assume the on-disk data is X, the current syncing data is Y,
1473 * and the current in-memory data is Z (currently in dmu_sync).
1474 * X and Z are identical but Y is has been modified. Normally,
1475 * when X and Z are the same we will perform a nopwrite but if Y
1476 * is different we must disable nopwrite since the resulting write
1477 * of Y to disk can free the block containing X. If we allowed a
1478 * nopwrite to occur the block pointing to Z would reference a freed
1479 * block. Since this is a rare case we simplify this by disabling
1480 * nopwrite if the current dmu_sync-ing dbuf has been modified in
1481 * a previous transaction.
1484 zp
.zp_nopwrite
= B_FALSE
;
1486 ASSERT(dr
->dr_txg
== txg
);
1487 if (dr
->dt
.dl
.dr_override_state
== DR_IN_DMU_SYNC
||
1488 dr
->dt
.dl
.dr_override_state
== DR_OVERRIDDEN
) {
1490 * We have already issued a sync write for this buffer,
1491 * or this buffer has already been synced. It could not
1492 * have been dirtied since, or we would have cleared the state.
1494 mutex_exit(&db
->db_mtx
);
1495 return (SET_ERROR(EALREADY
));
1498 ASSERT(dr
->dt
.dl
.dr_override_state
== DR_NOT_OVERRIDDEN
);
1499 dr
->dt
.dl
.dr_override_state
= DR_IN_DMU_SYNC
;
1500 mutex_exit(&db
->db_mtx
);
1502 dsa
= kmem_alloc(sizeof (dmu_sync_arg_t
), KM_SLEEP
);
1504 dsa
->dsa_done
= done
;
1508 zio_nowait(arc_write(pio
, os
->os_spa
, txg
,
1509 bp
, dr
->dt
.dl
.dr_data
, DBUF_IS_L2CACHEABLE(db
),
1510 DBUF_IS_L2COMPRESSIBLE(db
), &zp
, dmu_sync_ready
, dmu_sync_done
,
1511 dsa
, ZIO_PRIORITY_SYNC_WRITE
, ZIO_FLAG_CANFAIL
, &zb
));
1517 dmu_object_set_blocksize(objset_t
*os
, uint64_t object
, uint64_t size
, int ibs
,
1523 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1526 err
= dnode_set_blksz(dn
, size
, ibs
, tx
);
1527 dnode_rele(dn
, FTAG
);
1532 dmu_object_set_checksum(objset_t
*os
, uint64_t object
, uint8_t checksum
,
1537 /* XXX assumes dnode_hold will not get an i/o error */
1538 (void) dnode_hold(os
, object
, FTAG
, &dn
);
1539 ASSERT(checksum
< ZIO_CHECKSUM_FUNCTIONS
);
1540 dn
->dn_checksum
= checksum
;
1541 dnode_setdirty(dn
, tx
);
1542 dnode_rele(dn
, FTAG
);
1546 dmu_object_set_compress(objset_t
*os
, uint64_t object
, uint8_t compress
,
1551 /* XXX assumes dnode_hold will not get an i/o error */
1552 (void) dnode_hold(os
, object
, FTAG
, &dn
);
1553 ASSERT(compress
< ZIO_COMPRESS_FUNCTIONS
);
1554 dn
->dn_compress
= compress
;
1555 dnode_setdirty(dn
, tx
);
1556 dnode_rele(dn
, FTAG
);
1559 int zfs_mdcomp_disable
= 0;
1562 dmu_write_policy(objset_t
*os
, dnode_t
*dn
, int level
, int wp
, zio_prop_t
*zp
)
1564 dmu_object_type_t type
= dn
? dn
->dn_type
: DMU_OT_OBJSET
;
1565 boolean_t ismd
= (level
> 0 || DMU_OT_IS_METADATA(type
) ||
1567 enum zio_checksum checksum
= os
->os_checksum
;
1568 enum zio_compress compress
= os
->os_compress
;
1569 enum zio_checksum dedup_checksum
= os
->os_dedup_checksum
;
1570 boolean_t dedup
= B_FALSE
;
1571 boolean_t nopwrite
= B_FALSE
;
1572 boolean_t dedup_verify
= os
->os_dedup_verify
;
1573 int copies
= os
->os_copies
;
1576 * We maintain different write policies for each of the following
1579 * 2. preallocated blocks (i.e. level-0 blocks of a dump device)
1580 * 3. all other level 0 blocks
1584 * XXX -- we should design a compression algorithm
1585 * that specializes in arrays of bps.
1587 compress
= zfs_mdcomp_disable
? ZIO_COMPRESS_EMPTY
:
1591 * Metadata always gets checksummed. If the data
1592 * checksum is multi-bit correctable, and it's not a
1593 * ZBT-style checksum, then it's suitable for metadata
1594 * as well. Otherwise, the metadata checksum defaults
1597 if (zio_checksum_table
[checksum
].ci_correctable
< 1 ||
1598 zio_checksum_table
[checksum
].ci_eck
)
1599 checksum
= ZIO_CHECKSUM_FLETCHER_4
;
1600 } else if (wp
& WP_NOFILL
) {
1604 * If we're writing preallocated blocks, we aren't actually
1605 * writing them so don't set any policy properties. These
1606 * blocks are currently only used by an external subsystem
1607 * outside of zfs (i.e. dump) and not written by the zio
1610 compress
= ZIO_COMPRESS_OFF
;
1611 checksum
= ZIO_CHECKSUM_OFF
;
1613 compress
= zio_compress_select(dn
->dn_compress
, compress
);
1615 checksum
= (dedup_checksum
== ZIO_CHECKSUM_OFF
) ?
1616 zio_checksum_select(dn
->dn_checksum
, checksum
) :
1620 * Determine dedup setting. If we are in dmu_sync(),
1621 * we won't actually dedup now because that's all
1622 * done in syncing context; but we do want to use the
1623 * dedup checkum. If the checksum is not strong
1624 * enough to ensure unique signatures, force
1627 if (dedup_checksum
!= ZIO_CHECKSUM_OFF
) {
1628 dedup
= (wp
& WP_DMU_SYNC
) ? B_FALSE
: B_TRUE
;
1629 if (!zio_checksum_table
[checksum
].ci_dedup
)
1630 dedup_verify
= B_TRUE
;
1634 * Enable nopwrite if we have a cryptographically secure
1635 * checksum that has no known collisions (i.e. SHA-256)
1636 * and compression is enabled. We don't enable nopwrite if
1637 * dedup is enabled as the two features are mutually exclusive.
1639 nopwrite
= (!dedup
&& zio_checksum_table
[checksum
].ci_dedup
&&
1640 compress
!= ZIO_COMPRESS_OFF
&& zfs_nopwrite_enabled
);
1643 zp
->zp_checksum
= checksum
;
1644 zp
->zp_compress
= compress
;
1645 zp
->zp_type
= (wp
& WP_SPILL
) ? dn
->dn_bonustype
: type
;
1646 zp
->zp_level
= level
;
1647 zp
->zp_copies
= MIN(copies
+ ismd
, spa_max_replication(os
->os_spa
));
1648 zp
->zp_dedup
= dedup
;
1649 zp
->zp_dedup_verify
= dedup
&& dedup_verify
;
1650 zp
->zp_nopwrite
= nopwrite
;
1654 dmu_offset_next(objset_t
*os
, uint64_t object
, boolean_t hole
, uint64_t *off
)
1659 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1663 * Sync any current changes before
1664 * we go trundling through the block pointers.
1666 for (i
= 0; i
< TXG_SIZE
; i
++) {
1667 if (list_link_active(&dn
->dn_dirty_link
[i
]))
1670 if (i
!= TXG_SIZE
) {
1671 dnode_rele(dn
, FTAG
);
1672 txg_wait_synced(dmu_objset_pool(os
), 0);
1673 err
= dnode_hold(os
, object
, FTAG
, &dn
);
1678 err
= dnode_next_offset(dn
, (hole
? DNODE_FIND_HOLE
: 0), off
, 1, 1, 0);
1679 dnode_rele(dn
, FTAG
);
1685 dmu_object_info_from_dnode(dnode_t
*dn
, dmu_object_info_t
*doi
)
1689 rw_enter(&dn
->dn_struct_rwlock
, RW_READER
);
1690 mutex_enter(&dn
->dn_mtx
);
1694 doi
->doi_data_block_size
= dn
->dn_datablksz
;
1695 doi
->doi_metadata_block_size
= dn
->dn_indblkshift
?
1696 1ULL << dn
->dn_indblkshift
: 0;
1697 doi
->doi_type
= dn
->dn_type
;
1698 doi
->doi_bonus_type
= dn
->dn_bonustype
;
1699 doi
->doi_bonus_size
= dn
->dn_bonuslen
;
1700 doi
->doi_indirection
= dn
->dn_nlevels
;
1701 doi
->doi_checksum
= dn
->dn_checksum
;
1702 doi
->doi_compress
= dn
->dn_compress
;
1703 doi
->doi_physical_blocks_512
= (DN_USED_BYTES(dnp
) + 256) >> 9;
1704 doi
->doi_max_offset
= (dn
->dn_maxblkid
+ 1) * dn
->dn_datablksz
;
1705 doi
->doi_fill_count
= 0;
1706 for (int i
= 0; i
< dnp
->dn_nblkptr
; i
++)
1707 doi
->doi_fill_count
+= dnp
->dn_blkptr
[i
].blk_fill
;
1709 mutex_exit(&dn
->dn_mtx
);
1710 rw_exit(&dn
->dn_struct_rwlock
);
1714 * Get information on a DMU object.
1715 * If doi is NULL, just indicates whether the object exists.
1718 dmu_object_info(objset_t
*os
, uint64_t object
, dmu_object_info_t
*doi
)
1721 int err
= dnode_hold(os
, object
, FTAG
, &dn
);
1727 dmu_object_info_from_dnode(dn
, doi
);
1729 dnode_rele(dn
, FTAG
);
1734 * As above, but faster; can be used when you have a held dbuf in hand.
1737 dmu_object_info_from_db(dmu_buf_t
*db_fake
, dmu_object_info_t
*doi
)
1739 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
1742 dmu_object_info_from_dnode(DB_DNODE(db
), doi
);
1747 * Faster still when you only care about the size.
1748 * This is specifically optimized for zfs_getattr().
1751 dmu_object_size_from_db(dmu_buf_t
*db_fake
, uint32_t *blksize
,
1752 u_longlong_t
*nblk512
)
1754 dmu_buf_impl_t
*db
= (dmu_buf_impl_t
*)db_fake
;
1760 *blksize
= dn
->dn_datablksz
;
1761 /* add 1 for dnode space */
1762 *nblk512
= ((DN_USED_BYTES(dn
->dn_phys
) + SPA_MINBLOCKSIZE
/2) >>
1763 SPA_MINBLOCKSHIFT
) + 1;
1768 byteswap_uint64_array(void *vbuf
, size_t size
)
1770 uint64_t *buf
= vbuf
;
1771 size_t count
= size
>> 3;
1774 ASSERT((size
& 7) == 0);
1776 for (i
= 0; i
< count
; i
++)
1777 buf
[i
] = BSWAP_64(buf
[i
]);
1781 byteswap_uint32_array(void *vbuf
, size_t size
)
1783 uint32_t *buf
= vbuf
;
1784 size_t count
= size
>> 2;
1787 ASSERT((size
& 3) == 0);
1789 for (i
= 0; i
< count
; i
++)
1790 buf
[i
] = BSWAP_32(buf
[i
]);
1794 byteswap_uint16_array(void *vbuf
, size_t size
)
1796 uint16_t *buf
= vbuf
;
1797 size_t count
= size
>> 1;
1800 ASSERT((size
& 1) == 0);
1802 for (i
= 0; i
< count
; i
++)
1803 buf
[i
] = BSWAP_16(buf
[i
]);
1808 byteswap_uint8_array(void *vbuf
, size_t size
)