1fa9e4066Sahrens /*
2fa9e4066Sahrens * CDDL HEADER START
3fa9e4066Sahrens *
4fa9e4066Sahrens * The contents of this file are subject to the terms of the
5ea8dc4b6Seschrock * Common Development and Distribution License (the "License").
6ea8dc4b6Seschrock * You may not use this file except in compliance with the License.
7fa9e4066Sahrens *
8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing.
10fa9e4066Sahrens * See the License for the specific language governing permissions
11fa9e4066Sahrens * and limitations under the License.
12fa9e4066Sahrens *
13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each
14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the
16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying
17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner]
18fa9e4066Sahrens *
19fa9e4066Sahrens * CDDL HEADER END
20fa9e4066Sahrens */
21fa9e4066Sahrens /*
2294d1a210STim Haley * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23fa9e4066Sahrens */
24857c96d2SIgor Kozhukhov /*
25857c96d2SIgor Kozhukhov * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
266d658717SJohn Levon * Copyright 2019 Joyent, Inc.
27857c96d2SIgor Kozhukhov * Copyright 2016 Nexenta Systems, Inc. All rights reserved.
28857c96d2SIgor Kozhukhov * Copyright (c) 2011, 2017 by Delphix. All rights reserved.
29857c96d2SIgor Kozhukhov * Copyright (c) 2018 DilOS
30857c96d2SIgor Kozhukhov */
31aad02571SSaso Kiselkov
32fa9e4066Sahrens #include <sys/dmu.h>
33fa9e4066Sahrens #include <sys/dmu_impl.h>
34fa9e4066Sahrens #include <sys/dmu_tx.h>
35fa9e4066Sahrens #include <sys/dbuf.h>
36fa9e4066Sahrens #include <sys/dnode.h>
37fa9e4066Sahrens #include <sys/zfs_context.h>
38fa9e4066Sahrens #include <sys/dmu_objset.h>
39fa9e4066Sahrens #include <sys/dmu_traverse.h>
40fa9e4066Sahrens #include <sys/dsl_dataset.h>
41fa9e4066Sahrens #include <sys/dsl_dir.h>
42fa9e4066Sahrens #include <sys/dsl_pool.h>
431d452cf5Sahrens #include <sys/dsl_synctask.h>
44a2eea2e1Sahrens #include <sys/dsl_prop.h>
45fa9e4066Sahrens #include <sys/dmu_zfetch.h>
46fa9e4066Sahrens #include <sys/zfs_ioctl.h>
47fa9e4066Sahrens #include <sys/zap.h>
48ea8dc4b6Seschrock #include <sys/zio_checksum.h>
4980901aeaSGeorge Wilson #include <sys/zio_compress.h>
500a586ceaSMark Shellenbaum #include <sys/sa.h>
51b8289d24SDaniil Lunev #include <sys/zfeature.h>
52770499e1SDan Kimmel #include <sys/abd.h>
5344eda4d7Smaybee #ifdef _KERNEL
5444eda4d7Smaybee #include <sys/vmsystm.h>
550fab61baSJonathan W Adams #include <sys/zfs_znode.h>
5644eda4d7Smaybee #endif
57fa9e4066Sahrens
58857c96d2SIgor Kozhukhov static xuio_stats_t xuio_stats = {
59857c96d2SIgor Kozhukhov { "onloan_read_buf", KSTAT_DATA_UINT64 },
60857c96d2SIgor Kozhukhov { "onloan_write_buf", KSTAT_DATA_UINT64 },
61857c96d2SIgor Kozhukhov { "read_buf_copied", KSTAT_DATA_UINT64 },
62857c96d2SIgor Kozhukhov { "read_buf_nocopy", KSTAT_DATA_UINT64 },
63857c96d2SIgor Kozhukhov { "write_buf_copied", KSTAT_DATA_UINT64 },
64857c96d2SIgor Kozhukhov { "write_buf_nocopy", KSTAT_DATA_UINT64 }
65857c96d2SIgor Kozhukhov };
66857c96d2SIgor Kozhukhov
67857c96d2SIgor Kozhukhov #define XUIOSTAT_INCR(stat, val) \
68857c96d2SIgor Kozhukhov atomic_add_64(&xuio_stats.stat.value.ui64, (val))
69857c96d2SIgor Kozhukhov #define XUIOSTAT_BUMP(stat) XUIOSTAT_INCR(stat, 1)
70857c96d2SIgor Kozhukhov
7180901aeaSGeorge Wilson /*
7280901aeaSGeorge Wilson * Enable/disable nopwrite feature.
7380901aeaSGeorge Wilson */
7480901aeaSGeorge Wilson int zfs_nopwrite_enabled = 1;
7580901aeaSGeorge Wilson
76ff5177eeSAlek Pinchuk /*
77ff5177eeSAlek Pinchuk * Tunable to control percentage of dirtied blocks from frees in one TXG.
78ff5177eeSAlek Pinchuk * After this threshold is crossed, additional dirty blocks from frees
79ff5177eeSAlek Pinchuk * wait until the next TXG.
80ff5177eeSAlek Pinchuk * A value of zero will disable this throttle.
81ff5177eeSAlek Pinchuk */
82ff5177eeSAlek Pinchuk uint32_t zfs_per_txg_dirty_frees_percent = 30;
83ff5177eeSAlek Pinchuk
845cabbc6bSPrashanth Sreenivasa /*
855cabbc6bSPrashanth Sreenivasa * This can be used for testing, to ensure that certain actions happen
865cabbc6bSPrashanth Sreenivasa * while in the middle of a remap (which might otherwise complete too
875cabbc6bSPrashanth Sreenivasa * quickly).
885cabbc6bSPrashanth Sreenivasa */
895cabbc6bSPrashanth Sreenivasa int zfs_object_remap_one_indirect_delay_ticks = 0;
905cabbc6bSPrashanth Sreenivasa
9152abb70eSMatthew Ahrens /*
9252abb70eSMatthew Ahrens * Limit the amount we can prefetch with one call to this amount. This
9352abb70eSMatthew Ahrens * helps to limit the amount of memory that can be used by prefetching.
9452abb70eSMatthew Ahrens * Larger objects should be prefetched a bit at a time.
9552abb70eSMatthew Ahrens */
9652abb70eSMatthew Ahrens uint64_t dmu_prefetch_max = 8 * SPA_MAXBLOCKSIZE;
9752abb70eSMatthew Ahrens
98fa9e4066Sahrens const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES] = {
99eb633035STom Caputi { DMU_BSWAP_UINT8, TRUE, FALSE, FALSE, "unallocated" },
100eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, TRUE, FALSE, "object directory" },
101eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, TRUE, FALSE, "object array" },
102eb633035STom Caputi { DMU_BSWAP_UINT8, TRUE, FALSE, FALSE, "packed nvlist" },
103eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, FALSE, FALSE, "packed nvlist size" },
104eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, FALSE, FALSE, "bpobj" },
105eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, FALSE, FALSE, "bpobj header" },
106eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, FALSE, FALSE, "SPA space map header" },
107eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, FALSE, FALSE, "SPA space map" },
108eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, FALSE, TRUE, "ZIL intent log" },
109eb633035STom Caputi { DMU_BSWAP_DNODE, TRUE, FALSE, TRUE, "DMU dnode" },
110eb633035STom Caputi { DMU_BSWAP_OBJSET, TRUE, TRUE, FALSE, "DMU objset" },
111eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, TRUE, FALSE, "DSL directory" },
112eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, TRUE, FALSE, "DSL directory child map" },
113eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, TRUE, FALSE, "DSL dataset snap map" },
114eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, TRUE, FALSE, "DSL props" },
115eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, TRUE, FALSE, "DSL dataset" },
116eb633035STom Caputi { DMU_BSWAP_ZNODE, TRUE, FALSE, FALSE, "ZFS znode" },
117eb633035STom Caputi { DMU_BSWAP_OLDACL, TRUE, FALSE, TRUE, "ZFS V0 ACL" },
118eb633035STom Caputi { DMU_BSWAP_UINT8, FALSE, FALSE, TRUE, "ZFS plain file" },
119eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, TRUE, "ZFS directory" },
120eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, FALSE, "ZFS master node" },
121eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, TRUE, "ZFS delete queue" },
122eb633035STom Caputi { DMU_BSWAP_UINT8, FALSE, FALSE, TRUE, "zvol object" },
123eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, FALSE, "zvol prop" },
124eb633035STom Caputi { DMU_BSWAP_UINT8, FALSE, FALSE, TRUE, "other uint8[]" },
125eb633035STom Caputi { DMU_BSWAP_UINT64, FALSE, FALSE, TRUE, "other uint64[]" },
126eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, FALSE, "other ZAP" },
127eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, FALSE, "persistent error log" },
128eb633035STom Caputi { DMU_BSWAP_UINT8, TRUE, FALSE, FALSE, "SPA history" },
129eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, FALSE, FALSE, "SPA history offsets" },
130eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, TRUE, FALSE, "Pool properties" },
131eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, TRUE, FALSE, "DSL permissions" },
132eb633035STom Caputi { DMU_BSWAP_ACL, TRUE, FALSE, TRUE, "ZFS ACL" },
133eb633035STom Caputi { DMU_BSWAP_UINT8, TRUE, FALSE, TRUE, "ZFS SYSACL" },
134eb633035STom Caputi { DMU_BSWAP_UINT8, TRUE, FALSE, TRUE, "FUID table" },
135eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, FALSE, FALSE, "FUID table size" },
136eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, TRUE, FALSE, "DSL dataset next clones" },
137eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, FALSE, "scan work queue" },
138f67950b2SNasf-Fan { DMU_BSWAP_ZAP, TRUE, FALSE, TRUE, "ZFS user/group/project used"},
139f67950b2SNasf-Fan { DMU_BSWAP_ZAP, TRUE, FALSE, TRUE, "ZFS user/group/proj quota"},
140eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, TRUE, FALSE, "snapshot refcount tags" },
141eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, FALSE, "DDT ZAP algorithm" },
142eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, FALSE, "DDT statistics" },
143eb633035STom Caputi { DMU_BSWAP_UINT8, TRUE, FALSE, TRUE, "System attributes" },
144eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, TRUE, "SA master node" },
145eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, TRUE, "SA attr registration" },
146eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, TRUE, "SA attr layouts" },
147eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, FALSE, FALSE, "scan translations" },
148eb633035STom Caputi { DMU_BSWAP_UINT8, FALSE, FALSE, TRUE, "deduplicated block" },
149eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, TRUE, FALSE, "DSL deadlist map" },
150eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, TRUE, FALSE, "DSL deadlist map hdr" },
151eb633035STom Caputi { DMU_BSWAP_ZAP, TRUE, TRUE, FALSE, "DSL dir clones" },
152eb633035STom Caputi { DMU_BSWAP_UINT64, TRUE, FALSE, FALSE, "bpobj subobj" }
153ad135b5dSChristopher Siden };
154ad135b5dSChristopher Siden
155ad135b5dSChristopher Siden const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS] = {
156ad135b5dSChristopher Siden { byteswap_uint8_array, "uint8" },
157ad135b5dSChristopher Siden { byteswap_uint16_array, "uint16" },
158ad135b5dSChristopher Siden { byteswap_uint32_array, "uint32" },
159ad135b5dSChristopher Siden { byteswap_uint64_array, "uint64" },
160ad135b5dSChristopher Siden { zap_byteswap, "zap" },
161ad135b5dSChristopher Siden { dnode_buf_byteswap, "dnode" },
162ad135b5dSChristopher Siden { dmu_objset_byteswap, "objset" },
163ad135b5dSChristopher Siden { zfs_znode_byteswap, "znode" },
164ad135b5dSChristopher Siden { zfs_oldacl_byteswap, "oldacl" },
165ad135b5dSChristopher Siden { zfs_acl_byteswap, "acl" }
1663f9d6ad7SLin Ling };
167fa9e4066Sahrens
168fa9e4066Sahrens int
dmu_buf_hold_noread_by_dnode(dnode_t * dn,uint64_t offset,void * tag,dmu_buf_t ** dbp)16979d72832SMatthew Ahrens dmu_buf_hold_noread_by_dnode(dnode_t *dn, uint64_t offset,
17079d72832SMatthew Ahrens void *tag, dmu_buf_t **dbp)
17179d72832SMatthew Ahrens {
17279d72832SMatthew Ahrens uint64_t blkid;
17379d72832SMatthew Ahrens dmu_buf_impl_t *db;
17479d72832SMatthew Ahrens
17579d72832SMatthew Ahrens rw_enter(&dn->dn_struct_rwlock, RW_READER);
1769704bf7fSPaul Dagnelie blkid = dbuf_whichblock(dn, 0, offset);
17779d72832SMatthew Ahrens db = dbuf_hold(dn, blkid, tag);
17879d72832SMatthew Ahrens rw_exit(&dn->dn_struct_rwlock);
17979d72832SMatthew Ahrens
18079d72832SMatthew Ahrens if (db == NULL) {
18179d72832SMatthew Ahrens *dbp = NULL;
18279d72832SMatthew Ahrens return (SET_ERROR(EIO));
18379d72832SMatthew Ahrens }
18479d72832SMatthew Ahrens
18579d72832SMatthew Ahrens *dbp = &db->db;
18679d72832SMatthew Ahrens return (0);
18779d72832SMatthew Ahrens }
18879d72832SMatthew Ahrens int
dmu_buf_hold_noread(objset_t * os,uint64_t object,uint64_t offset,void * tag,dmu_buf_t ** dbp)1895d7b4d43SMatthew Ahrens dmu_buf_hold_noread(objset_t *os, uint64_t object, uint64_t offset,
1905d7b4d43SMatthew Ahrens void *tag, dmu_buf_t **dbp)
191fa9e4066Sahrens {
192fa9e4066Sahrens dnode_t *dn;
193fa9e4066Sahrens uint64_t blkid;
194fa9e4066Sahrens dmu_buf_impl_t *db;
195ea8dc4b6Seschrock int err;
196fa9e4066Sahrens
197503ad85cSMatthew Ahrens err = dnode_hold(os, object, FTAG, &dn);
198ea8dc4b6Seschrock if (err)
199ea8dc4b6Seschrock return (err);
200fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER);
2019704bf7fSPaul Dagnelie blkid = dbuf_whichblock(dn, 0, offset);
202ea8dc4b6Seschrock db = dbuf_hold(dn, blkid, tag);
203fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock);
2045d7b4d43SMatthew Ahrens dnode_rele(dn, FTAG);
2055d7b4d43SMatthew Ahrens
206ea8dc4b6Seschrock if (db == NULL) {
2075d7b4d43SMatthew Ahrens *dbp = NULL;
2085d7b4d43SMatthew Ahrens return (SET_ERROR(EIO));
2095d7b4d43SMatthew Ahrens }
2105d7b4d43SMatthew Ahrens
2115d7b4d43SMatthew Ahrens *dbp = &db->db;
2125d7b4d43SMatthew Ahrens return (err);
2135d7b4d43SMatthew Ahrens }
2145d7b4d43SMatthew Ahrens
2155d7b4d43SMatthew Ahrens int
dmu_buf_hold_by_dnode(dnode_t * dn,uint64_t offset,void * tag,dmu_buf_t ** dbp,int flags)21679d72832SMatthew Ahrens dmu_buf_hold_by_dnode(dnode_t *dn, uint64_t offset,
21779d72832SMatthew Ahrens void *tag, dmu_buf_t **dbp, int flags)
21879d72832SMatthew Ahrens {
21979d72832SMatthew Ahrens int err;
22079d72832SMatthew Ahrens int db_flags = DB_RF_CANFAIL;
22179d72832SMatthew Ahrens
22279d72832SMatthew Ahrens if (flags & DMU_READ_NO_PREFETCH)
22379d72832SMatthew Ahrens db_flags |= DB_RF_NOPREFETCH;
224eb633035STom Caputi if (flags & DMU_READ_NO_DECRYPT)
225eb633035STom Caputi db_flags |= DB_RF_NO_DECRYPT;
22679d72832SMatthew Ahrens
22779d72832SMatthew Ahrens err = dmu_buf_hold_noread_by_dnode(dn, offset, tag, dbp);
22879d72832SMatthew Ahrens if (err == 0) {
22979d72832SMatthew Ahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)(*dbp);
23079d72832SMatthew Ahrens err = dbuf_read(db, NULL, db_flags);
23179d72832SMatthew Ahrens if (err != 0) {
23279d72832SMatthew Ahrens dbuf_rele(db, tag);
23379d72832SMatthew Ahrens *dbp = NULL;
23479d72832SMatthew Ahrens }
23579d72832SMatthew Ahrens }
23679d72832SMatthew Ahrens
23779d72832SMatthew Ahrens return (err);
23879d72832SMatthew Ahrens }
23979d72832SMatthew Ahrens
24079d72832SMatthew Ahrens int
dmu_buf_hold(objset_t * os,uint64_t object,uint64_t offset,void * tag,dmu_buf_t ** dbp,int flags)2415d7b4d43SMatthew Ahrens dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset,
2425d7b4d43SMatthew Ahrens void *tag, dmu_buf_t **dbp, int flags)
2435d7b4d43SMatthew Ahrens {
2445d7b4d43SMatthew Ahrens int err;
2455d7b4d43SMatthew Ahrens int db_flags = DB_RF_CANFAIL;
2465d7b4d43SMatthew Ahrens
2475d7b4d43SMatthew Ahrens if (flags & DMU_READ_NO_PREFETCH)
2485d7b4d43SMatthew Ahrens db_flags |= DB_RF_NOPREFETCH;
249eb633035STom Caputi if (flags & DMU_READ_NO_DECRYPT)
250eb633035STom Caputi db_flags |= DB_RF_NO_DECRYPT;
2515d7b4d43SMatthew Ahrens
2525d7b4d43SMatthew Ahrens err = dmu_buf_hold_noread(os, object, offset, tag, dbp);
2535d7b4d43SMatthew Ahrens if (err == 0) {
2545d7b4d43SMatthew Ahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)(*dbp);
25547cb52daSJeff Bonwick err = dbuf_read(db, NULL, db_flags);
2565d7b4d43SMatthew Ahrens if (err != 0) {
257ea8dc4b6Seschrock dbuf_rele(db, tag);
2585d7b4d43SMatthew Ahrens *dbp = NULL;
259ea8dc4b6Seschrock }
260fa9e4066Sahrens }
261fa9e4066Sahrens
262ea8dc4b6Seschrock return (err);
263fa9e4066Sahrens }
264fa9e4066Sahrens
265fa9e4066Sahrens int
dmu_bonus_max(void)266fa9e4066Sahrens dmu_bonus_max(void)
267fa9e4066Sahrens {
26854811da5SToomas Soome return (DN_OLD_MAX_BONUSLEN);
269fa9e4066Sahrens }
270fa9e4066Sahrens
2711934e92fSmaybee int
dmu_set_bonus(dmu_buf_t * db_fake,int newsize,dmu_tx_t * tx)272744947dcSTom Erickson dmu_set_bonus(dmu_buf_t *db_fake, int newsize, dmu_tx_t *tx)
2731934e92fSmaybee {
274744947dcSTom Erickson dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
275744947dcSTom Erickson dnode_t *dn;
276744947dcSTom Erickson int error;
2771934e92fSmaybee
278744947dcSTom Erickson DB_DNODE_ENTER(db);
279744947dcSTom Erickson dn = DB_DNODE(db);
280744947dcSTom Erickson
281744947dcSTom Erickson if (dn->dn_bonus != db) {
282be6fd75aSMatthew Ahrens error = SET_ERROR(EINVAL);
283744947dcSTom Erickson } else if (newsize < 0 || newsize > db_fake->db_size) {
284be6fd75aSMatthew Ahrens error = SET_ERROR(EINVAL);
285744947dcSTom Erickson } else {
2861934e92fSmaybee dnode_setbonuslen(dn, newsize, tx);
287744947dcSTom Erickson error = 0;
288744947dcSTom Erickson }
289744947dcSTom Erickson
290744947dcSTom Erickson DB_DNODE_EXIT(db);
291744947dcSTom Erickson return (error);
2921934e92fSmaybee }
2931934e92fSmaybee
2940a586ceaSMark Shellenbaum int
dmu_set_bonustype(dmu_buf_t * db_fake,dmu_object_type_t type,dmu_tx_t * tx)295744947dcSTom Erickson dmu_set_bonustype(dmu_buf_t *db_fake, dmu_object_type_t type, dmu_tx_t *tx)
2960a586ceaSMark Shellenbaum {
297744947dcSTom Erickson dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
298744947dcSTom Erickson dnode_t *dn;
299744947dcSTom Erickson int error;
3000a586ceaSMark Shellenbaum
301744947dcSTom Erickson DB_DNODE_ENTER(db);
302744947dcSTom Erickson dn = DB_DNODE(db);
3030a586ceaSMark Shellenbaum
304ad135b5dSChristopher Siden if (!DMU_OT_IS_VALID(type)) {
305be6fd75aSMatthew Ahrens error = SET_ERROR(EINVAL);
306744947dcSTom Erickson } else if (dn->dn_bonus != db) {
307be6fd75aSMatthew Ahrens error = SET_ERROR(EINVAL);
308744947dcSTom Erickson } else {
3090a586ceaSMark Shellenbaum dnode_setbonus_type(dn, type, tx);
310744947dcSTom Erickson error = 0;
311744947dcSTom Erickson }
312744947dcSTom Erickson
313744947dcSTom Erickson DB_DNODE_EXIT(db);
314744947dcSTom Erickson return (error);
315744947dcSTom Erickson }
316744947dcSTom Erickson
317744947dcSTom Erickson dmu_object_type_t
dmu_get_bonustype(dmu_buf_t * db_fake)318744947dcSTom Erickson dmu_get_bonustype(dmu_buf_t *db_fake)
319744947dcSTom Erickson {
320744947dcSTom Erickson dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
321744947dcSTom Erickson dnode_t *dn;
322744947dcSTom Erickson dmu_object_type_t type;
323744947dcSTom Erickson
324744947dcSTom Erickson DB_DNODE_ENTER(db);
325744947dcSTom Erickson dn = DB_DNODE(db);
326744947dcSTom Erickson type = dn->dn_bonustype;
327744947dcSTom Erickson DB_DNODE_EXIT(db);
328744947dcSTom Erickson
329744947dcSTom Erickson return (type);
3300a586ceaSMark Shellenbaum }
3310a586ceaSMark Shellenbaum
3320a586ceaSMark Shellenbaum int
dmu_rm_spill(objset_t * os,uint64_t object,dmu_tx_t * tx)3330a586ceaSMark Shellenbaum dmu_rm_spill(objset_t *os, uint64_t object, dmu_tx_t *tx)
3340a586ceaSMark Shellenbaum {
3350a586ceaSMark Shellenbaum dnode_t *dn;
3360a586ceaSMark Shellenbaum int error;
3370a586ceaSMark Shellenbaum
3380a586ceaSMark Shellenbaum error = dnode_hold(os, object, FTAG, &dn);
3390a586ceaSMark Shellenbaum dbuf_rm_spill(dn, tx);
34006e0070dSMark Shellenbaum rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
34106e0070dSMark Shellenbaum dnode_rm_spill(dn, tx);
34206e0070dSMark Shellenbaum rw_exit(&dn->dn_struct_rwlock);
3430a586ceaSMark Shellenbaum dnode_rele(dn, FTAG);
3440a586ceaSMark Shellenbaum return (error);
3450a586ceaSMark Shellenbaum }
3460a586ceaSMark Shellenbaum
347fa9e4066Sahrens /*
348eb633035STom Caputi * Lookup and hold the bonus buffer for the provided dnode. If the dnode
349eb633035STom Caputi * has not yet been allocated a new bonus dbuf a will be allocated.
350eb633035STom Caputi * Returns ENOENT, EIO, or 0.
351eb633035STom Caputi */
dmu_bonus_hold_by_dnode(dnode_t * dn,void * tag,dmu_buf_t ** dbp,uint32_t flags)352eb633035STom Caputi int dmu_bonus_hold_by_dnode(dnode_t *dn, void *tag, dmu_buf_t **dbp,
353eb633035STom Caputi uint32_t flags)
354eb633035STom Caputi {
355eb633035STom Caputi dmu_buf_impl_t *db;
356eb633035STom Caputi int error;
357eb633035STom Caputi uint32_t db_flags = DB_RF_MUST_SUCCEED;
358eb633035STom Caputi
359eb633035STom Caputi if (flags & DMU_READ_NO_PREFETCH)
360eb633035STom Caputi db_flags |= DB_RF_NOPREFETCH;
361eb633035STom Caputi if (flags & DMU_READ_NO_DECRYPT)
362eb633035STom Caputi db_flags |= DB_RF_NO_DECRYPT;
363eb633035STom Caputi
364eb633035STom Caputi rw_enter(&dn->dn_struct_rwlock, RW_READER);
365eb633035STom Caputi if (dn->dn_bonus == NULL) {
366eb633035STom Caputi rw_exit(&dn->dn_struct_rwlock);
367eb633035STom Caputi rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
368eb633035STom Caputi if (dn->dn_bonus == NULL)
369eb633035STom Caputi dbuf_create_bonus(dn);
370eb633035STom Caputi }
371eb633035STom Caputi db = dn->dn_bonus;
372eb633035STom Caputi
373eb633035STom Caputi /* as long as the bonus buf is held, the dnode will be held */
374eb633035STom Caputi if (zfs_refcount_add(&db->db_holds, tag) == 1) {
375eb633035STom Caputi VERIFY(dnode_add_ref(dn, db));
376eb633035STom Caputi atomic_inc_32(&dn->dn_dbufs_count);
377eb633035STom Caputi }
378eb633035STom Caputi
379eb633035STom Caputi /*
380eb633035STom Caputi * Wait to drop dn_struct_rwlock until after adding the bonus dbuf's
381eb633035STom Caputi * hold and incrementing the dbuf count to ensure that dnode_move() sees
382eb633035STom Caputi * a dnode hold for every dbuf.
383eb633035STom Caputi */
384eb633035STom Caputi rw_exit(&dn->dn_struct_rwlock);
385eb633035STom Caputi
386eb633035STom Caputi error = dbuf_read(db, NULL, db_flags);
387eb633035STom Caputi if (error) {
388eb633035STom Caputi dnode_evict_bonus(dn);
389eb633035STom Caputi dbuf_rele(db, tag);
390eb633035STom Caputi *dbp = NULL;
391eb633035STom Caputi return (error);
392eb633035STom Caputi }
393eb633035STom Caputi
394eb633035STom Caputi *dbp = &db->db;
395eb633035STom Caputi return (0);
396eb633035STom Caputi }
397eb633035STom Caputi
398eb633035STom Caputi /*
399ea8dc4b6Seschrock * returns ENOENT, EIO, or 0.
400fa9e4066Sahrens */
401ea8dc4b6Seschrock int
dmu_bonus_hold_impl(objset_t * os,uint64_t object,void * tag,uint32_t flags,dmu_buf_t ** dbp)402eb633035STom Caputi dmu_bonus_hold_impl(objset_t *os, uint64_t object, void *tag, uint32_t flags,
403eb633035STom Caputi dmu_buf_t **dbp)
404fa9e4066Sahrens {
405ea8dc4b6Seschrock dnode_t *dn;
406fa9e4066Sahrens dmu_buf_impl_t *db;
4071934e92fSmaybee int error;
408eb633035STom Caputi uint32_t db_flags = DB_RF_MUST_SUCCEED;
409eb633035STom Caputi
410eb633035STom Caputi if (flags & DMU_READ_NO_PREFETCH)
411eb633035STom Caputi db_flags |= DB_RF_NOPREFETCH;
412eb633035STom Caputi if (flags & DMU_READ_NO_DECRYPT)
413eb633035STom Caputi db_flags |= DB_RF_NO_DECRYPT;
414fa9e4066Sahrens
415503ad85cSMatthew Ahrens error = dnode_hold(os, object, FTAG, &dn);
4161934e92fSmaybee if (error)
4171934e92fSmaybee return (error);
418fa9e4066Sahrens
419fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER);
420ea8dc4b6Seschrock if (dn->dn_bonus == NULL) {
421fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock);
422ea8dc4b6Seschrock rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
423ea8dc4b6Seschrock if (dn->dn_bonus == NULL)
4241934e92fSmaybee dbuf_create_bonus(dn);
425fa9e4066Sahrens }
426ea8dc4b6Seschrock db = dn->dn_bonus;
4271934e92fSmaybee
4281934e92fSmaybee /* as long as the bonus buf is held, the dnode will be held */
429e914ace2STim Schumacher if (zfs_refcount_add(&db->db_holds, tag) == 1) {
4301934e92fSmaybee VERIFY(dnode_add_ref(dn, db));
431640c1670SJosef 'Jeff' Sipek atomic_inc_32(&dn->dn_dbufs_count);
432744947dcSTom Erickson }
433744947dcSTom Erickson
434744947dcSTom Erickson /*
435744947dcSTom Erickson * Wait to drop dn_struct_rwlock until after adding the bonus dbuf's
436744947dcSTom Erickson * hold and incrementing the dbuf count to ensure that dnode_move() sees
437744947dcSTom Erickson * a dnode hold for every dbuf.
438744947dcSTom Erickson */
439744947dcSTom Erickson rw_exit(&dn->dn_struct_rwlock);
4401934e92fSmaybee
441fa9e4066Sahrens dnode_rele(dn, FTAG);
442ea8dc4b6Seschrock
443eb633035STom Caputi error = dbuf_read(db, NULL, db_flags);
444eb633035STom Caputi if (error) {
445eb633035STom Caputi dnode_evict_bonus(dn);
446eb633035STom Caputi dbuf_rele(db, tag);
447eb633035STom Caputi *dbp = NULL;
448eb633035STom Caputi return (error);
449eb633035STom Caputi }
450ea8dc4b6Seschrock
451ea8dc4b6Seschrock *dbp = &db->db;
452ea8dc4b6Seschrock return (0);
453fa9e4066Sahrens }
454fa9e4066Sahrens
455eb633035STom Caputi int
dmu_bonus_hold(objset_t * os,uint64_t obj,void * tag,dmu_buf_t ** dbp)456eb633035STom Caputi dmu_bonus_hold(objset_t *os, uint64_t obj, void *tag, dmu_buf_t **dbp)
457eb633035STom Caputi {
458eb633035STom Caputi return (dmu_bonus_hold_impl(os, obj, tag, DMU_READ_NO_PREFETCH, dbp));
459eb633035STom Caputi }
460eb633035STom Caputi
46113506d1eSmaybee /*
4620a586ceaSMark Shellenbaum * returns ENOENT, EIO, or 0.
4630a586ceaSMark Shellenbaum *
4640a586ceaSMark Shellenbaum * This interface will allocate a blank spill dbuf when a spill blk
4650a586ceaSMark Shellenbaum * doesn't already exist on the dnode.
4660a586ceaSMark Shellenbaum *
4670a586ceaSMark Shellenbaum * if you only want to find an already existing spill db, then
4680a586ceaSMark Shellenbaum * dmu_spill_hold_existing() should be used.
4690a586ceaSMark Shellenbaum */
4700a586ceaSMark Shellenbaum int
dmu_spill_hold_by_dnode(dnode_t * dn,uint32_t flags,void * tag,dmu_buf_t ** dbp)4710a586ceaSMark Shellenbaum dmu_spill_hold_by_dnode(dnode_t *dn, uint32_t flags, void *tag, dmu_buf_t **dbp)
4720a586ceaSMark Shellenbaum {
4730a586ceaSMark Shellenbaum dmu_buf_impl_t *db = NULL;
4740a586ceaSMark Shellenbaum int err;
4750a586ceaSMark Shellenbaum
4760a586ceaSMark Shellenbaum if ((flags & DB_RF_HAVESTRUCT) == 0)
4770a586ceaSMark Shellenbaum rw_enter(&dn->dn_struct_rwlock, RW_READER);
4780a586ceaSMark Shellenbaum
4790a586ceaSMark Shellenbaum db = dbuf_hold(dn, DMU_SPILL_BLKID, tag);
4800a586ceaSMark Shellenbaum
4810a586ceaSMark Shellenbaum if ((flags & DB_RF_HAVESTRUCT) == 0)
4820a586ceaSMark Shellenbaum rw_exit(&dn->dn_struct_rwlock);
4830a586ceaSMark Shellenbaum
4840a586ceaSMark Shellenbaum ASSERT(db != NULL);
4851d8ccc7bSMark Shellenbaum err = dbuf_read(db, NULL, flags);
4861d8ccc7bSMark Shellenbaum if (err == 0)
4870a586ceaSMark Shellenbaum *dbp = &db->db;
4881d8ccc7bSMark Shellenbaum else
4891d8ccc7bSMark Shellenbaum dbuf_rele(db, tag);
4900a586ceaSMark Shellenbaum return (err);
4910a586ceaSMark Shellenbaum }
4920a586ceaSMark Shellenbaum
4930a586ceaSMark Shellenbaum int
dmu_spill_hold_existing(dmu_buf_t * bonus,void * tag,dmu_buf_t ** dbp)4940a586ceaSMark Shellenbaum dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp)
4950a586ceaSMark Shellenbaum {
496744947dcSTom Erickson dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus;
497744947dcSTom Erickson dnode_t *dn;
4980a586ceaSMark Shellenbaum int err;
4990a586ceaSMark Shellenbaum
500744947dcSTom Erickson DB_DNODE_ENTER(db);
501744947dcSTom Erickson dn = DB_DNODE(db);
502744947dcSTom Erickson
503744947dcSTom Erickson if (spa_version(dn->dn_objset->os_spa) < SPA_VERSION_SA) {
504be6fd75aSMatthew Ahrens err = SET_ERROR(EINVAL);
505744947dcSTom Erickson } else {
5060a586ceaSMark Shellenbaum rw_enter(&dn->dn_struct_rwlock, RW_READER);
5070a586ceaSMark Shellenbaum
5080a586ceaSMark Shellenbaum if (!dn->dn_have_spill) {
509be6fd75aSMatthew Ahrens err = SET_ERROR(ENOENT);
510744947dcSTom Erickson } else {
5111d8ccc7bSMark Shellenbaum err = dmu_spill_hold_by_dnode(dn,
5121d8ccc7bSMark Shellenbaum DB_RF_HAVESTRUCT | DB_RF_CANFAIL, tag, dbp);
513744947dcSTom Erickson }
514744947dcSTom Erickson
5150a586ceaSMark Shellenbaum rw_exit(&dn->dn_struct_rwlock);
516744947dcSTom Erickson }
517744947dcSTom Erickson
518744947dcSTom Erickson DB_DNODE_EXIT(db);
5190a586ceaSMark Shellenbaum return (err);
5200a586ceaSMark Shellenbaum }
5210a586ceaSMark Shellenbaum
5220a586ceaSMark Shellenbaum int
dmu_spill_hold_by_bonus(dmu_buf_t * bonus,uint32_t flags,void * tag,dmu_buf_t ** dbp)523eb633035STom Caputi dmu_spill_hold_by_bonus(dmu_buf_t *bonus, uint32_t flags, void *tag,
524eb633035STom Caputi dmu_buf_t **dbp)
5250a586ceaSMark Shellenbaum {
526744947dcSTom Erickson dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus;
527744947dcSTom Erickson dnode_t *dn;
528744947dcSTom Erickson int err;
529eb633035STom Caputi uint32_t db_flags = DB_RF_CANFAIL;
530eb633035STom Caputi
531eb633035STom Caputi if (flags & DMU_READ_NO_DECRYPT)
532eb633035STom Caputi db_flags |= DB_RF_NO_DECRYPT;
533744947dcSTom Erickson
534744947dcSTom Erickson DB_DNODE_ENTER(db);
535744947dcSTom Erickson dn = DB_DNODE(db);
536eb633035STom Caputi err = dmu_spill_hold_by_dnode(dn, db_flags, tag, dbp);
537744947dcSTom Erickson DB_DNODE_EXIT(db);
538744947dcSTom Erickson
539744947dcSTom Erickson return (err);
5400a586ceaSMark Shellenbaum }
5410a586ceaSMark Shellenbaum
5420a586ceaSMark Shellenbaum /*
54313506d1eSmaybee * Note: longer-term, we should modify all of the dmu_buf_*() interfaces
54413506d1eSmaybee * to take a held dnode rather than <os, object> -- the lookup is wasteful,
54513506d1eSmaybee * and can induce severe lock contention when writing to several files
54613506d1eSmaybee * whose dnodes are in the same block.
54713506d1eSmaybee */
5488dfe5547SRichard Yao int
dmu_buf_hold_array_by_dnode(dnode_t * dn,uint64_t offset,uint64_t length,boolean_t read,void * tag,int * numbufsp,dmu_buf_t *** dbpp,uint32_t flags)5497bfdf011SNeil Perrin dmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset, uint64_t length,
550cf6106c8SMatthew Ahrens boolean_t read, void *tag, int *numbufsp, dmu_buf_t ***dbpp, uint32_t flags)
551fa9e4066Sahrens {
552fa9e4066Sahrens dmu_buf_t **dbp;
553fa9e4066Sahrens uint64_t blkid, nblks, i;
5547bfdf011SNeil Perrin uint32_t dbuf_flags;
555ea8dc4b6Seschrock int err;
556ea8dc4b6Seschrock zio_t *zio;
557ea8dc4b6Seschrock
558ea8dc4b6Seschrock ASSERT(length <= DMU_MAX_ACCESS);
559fa9e4066Sahrens
560cf6106c8SMatthew Ahrens /*
561cf6106c8SMatthew Ahrens * Note: We directly notify the prefetch code of this read, so that
562cf6106c8SMatthew Ahrens * we can tell it about the multi-block read. dbuf_read() only knows
563cf6106c8SMatthew Ahrens * about the one block it is accessing.
564cf6106c8SMatthew Ahrens */
565cf6106c8SMatthew Ahrens dbuf_flags = DB_RF_CANFAIL | DB_RF_NEVERWAIT | DB_RF_HAVESTRUCT |
566cf6106c8SMatthew Ahrens DB_RF_NOPREFETCH;
567ea8dc4b6Seschrock
568fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER);
569fa9e4066Sahrens if (dn->dn_datablkshift) {
570fa9e4066Sahrens int blkshift = dn->dn_datablkshift;
571fa9e4066Sahrens nblks = (P2ROUNDUP(offset + length, 1ULL << blkshift) -
572fa9e4066Sahrens P2ALIGN(offset, 1ULL << blkshift)) >> blkshift;
573fa9e4066Sahrens } else {
5740125049cSahrens if (offset + length > dn->dn_datablksz) {
5750125049cSahrens zfs_panic_recover("zfs: accessing past end of object "
5760125049cSahrens "%llx/%llx (size=%u access=%llu+%llu)",
5770125049cSahrens (longlong_t)dn->dn_objset->
5780125049cSahrens os_dsl_dataset->ds_object,
5790125049cSahrens (longlong_t)dn->dn_object, dn->dn_datablksz,
5800125049cSahrens (longlong_t)offset, (longlong_t)length);
581c87b8fc5SMark J Musante rw_exit(&dn->dn_struct_rwlock);
582be6fd75aSMatthew Ahrens return (SET_ERROR(EIO));
5830125049cSahrens }
584fa9e4066Sahrens nblks = 1;
585fa9e4066Sahrens }
586ea8dc4b6Seschrock dbp = kmem_zalloc(sizeof (dmu_buf_t *) * nblks, KM_SLEEP);
587fa9e4066Sahrens
588e14bb325SJeff Bonwick zio = zio_root(dn->dn_objset->os_spa, NULL, NULL, ZIO_FLAG_CANFAIL);
589a2cdcdd2SPaul Dagnelie blkid = dbuf_whichblock(dn, 0, offset);
590fa9e4066Sahrens for (i = 0; i < nblks; i++) {
591ea8dc4b6Seschrock dmu_buf_impl_t *db = dbuf_hold(dn, blkid + i, tag);
592ea8dc4b6Seschrock if (db == NULL) {
593ea8dc4b6Seschrock rw_exit(&dn->dn_struct_rwlock);
594ea8dc4b6Seschrock dmu_buf_rele_array(dbp, nblks, tag);
595ea8dc4b6Seschrock zio_nowait(zio);
596be6fd75aSMatthew Ahrens return (SET_ERROR(EIO));
597ea8dc4b6Seschrock }
598cf6106c8SMatthew Ahrens
599ea8dc4b6Seschrock /* initiate async i/o */
600cf6106c8SMatthew Ahrens if (read)
6017bfdf011SNeil Perrin (void) dbuf_read(db, zio, dbuf_flags);
602ea8dc4b6Seschrock dbp[i] = &db->db;
603fa9e4066Sahrens }
604cf6106c8SMatthew Ahrens
605cb92f413SAlexander Motin if ((flags & DMU_READ_NO_PREFETCH) == 0 &&
606cb92f413SAlexander Motin DNODE_META_IS_CACHEABLE(dn) && length <= zfetch_array_rd_sz) {
607cb92f413SAlexander Motin dmu_zfetch(&dn->dn_zfetch, blkid, nblks,
6089704bf7fSPaul Dagnelie read && DNODE_IS_CACHEABLE(dn), B_TRUE);
609cf6106c8SMatthew Ahrens }
610fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock);
611fa9e4066Sahrens
612ea8dc4b6Seschrock /* wait for async i/o */
613ea8dc4b6Seschrock err = zio_wait(zio);
614ea8dc4b6Seschrock if (err) {
615ea8dc4b6Seschrock dmu_buf_rele_array(dbp, nblks, tag);
616ea8dc4b6Seschrock return (err);
617ea8dc4b6Seschrock }
618ea8dc4b6Seschrock
619ea8dc4b6Seschrock /* wait for other io to complete */
620ea8dc4b6Seschrock if (read) {
621ea8dc4b6Seschrock for (i = 0; i < nblks; i++) {
622ea8dc4b6Seschrock dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbp[i];
623ea8dc4b6Seschrock mutex_enter(&db->db_mtx);
624ea8dc4b6Seschrock while (db->db_state == DB_READ ||
625ea8dc4b6Seschrock db->db_state == DB_FILL)
626ea8dc4b6Seschrock cv_wait(&db->db_changed, &db->db_mtx);
627ea8dc4b6Seschrock if (db->db_state == DB_UNCACHED)
628be6fd75aSMatthew Ahrens err = SET_ERROR(EIO);
629ea8dc4b6Seschrock mutex_exit(&db->db_mtx);
630ea8dc4b6Seschrock if (err) {
631ea8dc4b6Seschrock dmu_buf_rele_array(dbp, nblks, tag);
632ea8dc4b6Seschrock return (err);
633ea8dc4b6Seschrock }
634ea8dc4b6Seschrock }
635ea8dc4b6Seschrock }
636ea8dc4b6Seschrock
637ea8dc4b6Seschrock *numbufsp = nblks;
638ea8dc4b6Seschrock *dbpp = dbp;
639ea8dc4b6Seschrock return (0);
640fa9e4066Sahrens }
641fa9e4066Sahrens
642a2eea2e1Sahrens static int
dmu_buf_hold_array(objset_t * os,uint64_t object,uint64_t offset,uint64_t length,int read,void * tag,int * numbufsp,dmu_buf_t *** dbpp)64313506d1eSmaybee dmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset,
64413506d1eSmaybee uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp)
64513506d1eSmaybee {
64613506d1eSmaybee dnode_t *dn;
64713506d1eSmaybee int err;
64813506d1eSmaybee
649503ad85cSMatthew Ahrens err = dnode_hold(os, object, FTAG, &dn);
65013506d1eSmaybee if (err)
65113506d1eSmaybee return (err);
65213506d1eSmaybee
65313506d1eSmaybee err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag,
6547bfdf011SNeil Perrin numbufsp, dbpp, DMU_READ_PREFETCH);
65513506d1eSmaybee
65613506d1eSmaybee dnode_rele(dn, FTAG);
65713506d1eSmaybee
65813506d1eSmaybee return (err);
65913506d1eSmaybee }
66013506d1eSmaybee
66113506d1eSmaybee int
dmu_buf_hold_array_by_bonus(dmu_buf_t * db_fake,uint64_t offset,uint64_t length,boolean_t read,void * tag,int * numbufsp,dmu_buf_t *** dbpp)662744947dcSTom Erickson dmu_buf_hold_array_by_bonus(dmu_buf_t *db_fake, uint64_t offset,
663cf6106c8SMatthew Ahrens uint64_t length, boolean_t read, void *tag, int *numbufsp,
664cf6106c8SMatthew Ahrens dmu_buf_t ***dbpp)
66513506d1eSmaybee {
666744947dcSTom Erickson dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
667744947dcSTom Erickson dnode_t *dn;
66813506d1eSmaybee int err;
66913506d1eSmaybee
670744947dcSTom Erickson DB_DNODE_ENTER(db);
671744947dcSTom Erickson dn = DB_DNODE(db);
67213506d1eSmaybee err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag,
6737bfdf011SNeil Perrin numbufsp, dbpp, DMU_READ_PREFETCH);
674744947dcSTom Erickson DB_DNODE_EXIT(db);
67513506d1eSmaybee
67613506d1eSmaybee return (err);
67713506d1eSmaybee }
67813506d1eSmaybee
679fa9e4066Sahrens void
dmu_buf_rele_array(dmu_buf_t ** dbp_fake,int numbufs,void * tag)680ea8dc4b6Seschrock dmu_buf_rele_array(dmu_buf_t **dbp_fake, int numbufs, void *tag)
681fa9e4066Sahrens {
682fa9e4066Sahrens int i;
683fa9e4066Sahrens dmu_buf_impl_t **dbp = (dmu_buf_impl_t **)dbp_fake;
684fa9e4066Sahrens
685fa9e4066Sahrens if (numbufs == 0)
686fa9e4066Sahrens return;
687fa9e4066Sahrens
688ea8dc4b6Seschrock for (i = 0; i < numbufs; i++) {
689ea8dc4b6Seschrock if (dbp[i])
690ea8dc4b6Seschrock dbuf_rele(dbp[i], tag);
691ea8dc4b6Seschrock }
692fa9e4066Sahrens
693fa9e4066Sahrens kmem_free(dbp, sizeof (dmu_buf_t *) * numbufs);
694fa9e4066Sahrens }
695fa9e4066Sahrens
69669962b56SMatthew Ahrens /*
697a2cdcdd2SPaul Dagnelie * Issue prefetch i/os for the given blocks. If level is greater than 0, the
698a2cdcdd2SPaul Dagnelie * indirect blocks prefeteched will be those that point to the blocks containing
699a2cdcdd2SPaul Dagnelie * the data starting at offset, and continuing to offset + len.
70069962b56SMatthew Ahrens *
701eb633035STom Caputi * Note that if the indirect blocks above the blocks being prefetched are not
702eb633035STom Caputi * in cache, they will be asychronously read in.
70369962b56SMatthew Ahrens */
704fa9e4066Sahrens void
dmu_prefetch(objset_t * os,uint64_t object,int64_t level,uint64_t offset,uint64_t len,zio_priority_t pri)705a2cdcdd2SPaul Dagnelie dmu_prefetch(objset_t *os, uint64_t object, int64_t level, uint64_t offset,
706a2cdcdd2SPaul Dagnelie uint64_t len, zio_priority_t pri)
707fa9e4066Sahrens {
708fa9e4066Sahrens dnode_t *dn;
709fa9e4066Sahrens uint64_t blkid;
71069962b56SMatthew Ahrens int nblks, err;
711fa9e4066Sahrens
712fa9e4066Sahrens if (len == 0) { /* they're interested in the bonus buffer */
713744947dcSTom Erickson dn = DMU_META_DNODE(os);
714fa9e4066Sahrens
715fa9e4066Sahrens if (object == 0 || object >= DN_MAX_OBJECT)
716fa9e4066Sahrens return;
717fa9e4066Sahrens
718fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER);
719a2cdcdd2SPaul Dagnelie blkid = dbuf_whichblock(dn, level,
720a2cdcdd2SPaul Dagnelie object * sizeof (dnode_phys_t));
721a2cdcdd2SPaul Dagnelie dbuf_prefetch(dn, level, blkid, pri, 0);
722fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock);
723fa9e4066Sahrens return;
724fa9e4066Sahrens }
725fa9e4066Sahrens
726fa9e4066Sahrens /*
72752abb70eSMatthew Ahrens * See comment before the definition of dmu_prefetch_max.
72852abb70eSMatthew Ahrens */
72952abb70eSMatthew Ahrens len = MIN(len, dmu_prefetch_max);
73052abb70eSMatthew Ahrens
73152abb70eSMatthew Ahrens /*
732fa9e4066Sahrens * XXX - Note, if the dnode for the requested object is not
733fa9e4066Sahrens * already cached, we will do a *synchronous* read in the
734fa9e4066Sahrens * dnode_hold() call. The same is true for any indirects.
735fa9e4066Sahrens */
736503ad85cSMatthew Ahrens err = dnode_hold(os, object, FTAG, &dn);
737ea8dc4b6Seschrock if (err != 0)
738fa9e4066Sahrens return;
739fa9e4066Sahrens
740a2cdcdd2SPaul Dagnelie /*
741a2cdcdd2SPaul Dagnelie * offset + len - 1 is the last byte we want to prefetch for, and offset
742a2cdcdd2SPaul Dagnelie * is the first. Then dbuf_whichblk(dn, level, off + len - 1) is the
743a2cdcdd2SPaul Dagnelie * last block we want to prefetch, and dbuf_whichblock(dn, level,
744a2cdcdd2SPaul Dagnelie * offset) is the first. Then the number we need to prefetch is the
745a2cdcdd2SPaul Dagnelie * last - first + 1.
746a2cdcdd2SPaul Dagnelie */
7479704bf7fSPaul Dagnelie rw_enter(&dn->dn_struct_rwlock, RW_READER);
748a2cdcdd2SPaul Dagnelie if (level > 0 || dn->dn_datablkshift != 0) {
749a2cdcdd2SPaul Dagnelie nblks = dbuf_whichblock(dn, level, offset + len - 1) -
750a2cdcdd2SPaul Dagnelie dbuf_whichblock(dn, level, offset) + 1;
751fa9e4066Sahrens } else {
752fa9e4066Sahrens nblks = (offset < dn->dn_datablksz);
753fa9e4066Sahrens }
754fa9e4066Sahrens
755fa9e4066Sahrens if (nblks != 0) {
756a2cdcdd2SPaul Dagnelie blkid = dbuf_whichblock(dn, level, offset);
75769962b56SMatthew Ahrens for (int i = 0; i < nblks; i++)
758a2cdcdd2SPaul Dagnelie dbuf_prefetch(dn, level, blkid + i, pri, 0);
759fa9e4066Sahrens }
760fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock);
761fa9e4066Sahrens
762fa9e4066Sahrens dnode_rele(dn, FTAG);
763fa9e4066Sahrens }
764fa9e4066Sahrens
76576256205SMark Maybee /*
76676256205SMark Maybee * Get the next "chunk" of file data to free. We traverse the file from
76776256205SMark Maybee * the end so that the file gets shorter over time (if we crashes in the
76876256205SMark Maybee * middle, this will leave us in a better state). We find allocated file
76976256205SMark Maybee * data by simply searching the allocated level 1 indirects.
770713d6c20SMatthew Ahrens *
771713d6c20SMatthew Ahrens * On input, *start should be the first offset that does not need to be
772713d6c20SMatthew Ahrens * freed (e.g. "offset + length"). On return, *start will be the first
773713d6c20SMatthew Ahrens * offset that should be freed.
77476256205SMark Maybee */
775cdb0ab79Smaybee static int
get_next_chunk(dnode_t * dn,uint64_t * start,uint64_t minimum)776713d6c20SMatthew Ahrens get_next_chunk(dnode_t *dn, uint64_t *start, uint64_t minimum)
777cdb0ab79Smaybee {
778713d6c20SMatthew Ahrens uint64_t maxblks = DMU_MAX_ACCESS >> (dn->dn_indblkshift + 1);
779713d6c20SMatthew Ahrens /* bytes of data covered by a level-1 indirect block */
78076256205SMark Maybee uint64_t iblkrange =
7811c8564a7SMark Maybee dn->dn_datablksz * EPB(dn->dn_indblkshift, SPA_BLKPTRSHIFT);
782cdb0ab79Smaybee
783713d6c20SMatthew Ahrens ASSERT3U(minimum, <=, *start);
784cdb0ab79Smaybee
785713d6c20SMatthew Ahrens if (*start - minimum <= iblkrange * maxblks) {
786713d6c20SMatthew Ahrens *start = minimum;
787cdb0ab79Smaybee return (0);
788cdb0ab79Smaybee }
78976256205SMark Maybee ASSERT(ISP2(iblkrange));
790cdb0ab79Smaybee
791713d6c20SMatthew Ahrens for (uint64_t blks = 0; *start > minimum && blks < maxblks; blks++) {
7921c8564a7SMark Maybee int err;
793cdb0ab79Smaybee
794713d6c20SMatthew Ahrens /*
795713d6c20SMatthew Ahrens * dnode_next_offset(BACKWARDS) will find an allocated L1
796713d6c20SMatthew Ahrens * indirect block at or before the input offset. We must
797713d6c20SMatthew Ahrens * decrement *start so that it is at the end of the region
798713d6c20SMatthew Ahrens * to search.
799713d6c20SMatthew Ahrens */
800713d6c20SMatthew Ahrens (*start)--;
801cdb0ab79Smaybee err = dnode_next_offset(dn,
80276256205SMark Maybee DNODE_FIND_BACKWARDS, start, 2, 1, 0);
803cdb0ab79Smaybee
804713d6c20SMatthew Ahrens /* if there are no indirect blocks before start, we are done */
80576256205SMark Maybee if (err == ESRCH) {
806713d6c20SMatthew Ahrens *start = minimum;
807713d6c20SMatthew Ahrens break;
808713d6c20SMatthew Ahrens } else if (err != 0) {
809cdb0ab79Smaybee return (err);
81076256205SMark Maybee }
811cdb0ab79Smaybee
812713d6c20SMatthew Ahrens /* set start to the beginning of this L1 indirect */
81376256205SMark Maybee *start = P2ALIGN(*start, iblkrange);
814cdb0ab79Smaybee }
815713d6c20SMatthew Ahrens if (*start < minimum)
816713d6c20SMatthew Ahrens *start = minimum;
817cdb0ab79Smaybee return (0);
818cdb0ab79Smaybee }
819cdb0ab79Smaybee
820eb721827SAlek Pinchuk /*
821eb721827SAlek Pinchuk * If this objset is of type OST_ZFS return true if vfs's unmounted flag is set,
822eb721827SAlek Pinchuk * otherwise return false.
823eb721827SAlek Pinchuk * Used below in dmu_free_long_range_impl() to enable abort when unmounting
824eb721827SAlek Pinchuk */
825eb721827SAlek Pinchuk /*ARGSUSED*/
826eb721827SAlek Pinchuk static boolean_t
dmu_objset_zfs_unmounting(objset_t * os)827eb721827SAlek Pinchuk dmu_objset_zfs_unmounting(objset_t *os)
828eb721827SAlek Pinchuk {
829eb721827SAlek Pinchuk #ifdef _KERNEL
830eb721827SAlek Pinchuk if (dmu_objset_type(os) == DMU_OST_ZFS)
831eb721827SAlek Pinchuk return (zfs_get_vfs_flag_unmounted(os));
832eb721827SAlek Pinchuk #endif
833eb721827SAlek Pinchuk return (B_FALSE);
834eb721827SAlek Pinchuk }
835eb721827SAlek Pinchuk
836cdb0ab79Smaybee static int
dmu_free_long_range_impl(objset_t * os,dnode_t * dn,uint64_t offset,uint64_t length)837cdb0ab79Smaybee dmu_free_long_range_impl(objset_t *os, dnode_t *dn, uint64_t offset,
838713d6c20SMatthew Ahrens uint64_t length)
839cdb0ab79Smaybee {
840713d6c20SMatthew Ahrens uint64_t object_size = (dn->dn_maxblkid + 1) * dn->dn_datablksz;
841713d6c20SMatthew Ahrens int err;
842ff5177eeSAlek Pinchuk uint64_t dirty_frees_threshold;
843ff5177eeSAlek Pinchuk dsl_pool_t *dp = dmu_objset_pool(os);
844cdb0ab79Smaybee
845713d6c20SMatthew Ahrens if (offset >= object_size)
846cdb0ab79Smaybee return (0);
847cdb0ab79Smaybee
848ff5177eeSAlek Pinchuk if (zfs_per_txg_dirty_frees_percent <= 100)
849ff5177eeSAlek Pinchuk dirty_frees_threshold =
850ff5177eeSAlek Pinchuk zfs_per_txg_dirty_frees_percent * zfs_dirty_data_max / 100;
851ff5177eeSAlek Pinchuk else
852ff5177eeSAlek Pinchuk dirty_frees_threshold = zfs_dirty_data_max / 4;
853ff5177eeSAlek Pinchuk
854713d6c20SMatthew Ahrens if (length == DMU_OBJECT_END || offset + length > object_size)
855713d6c20SMatthew Ahrens length = object_size - offset;
856713d6c20SMatthew Ahrens
857713d6c20SMatthew Ahrens while (length != 0) {
858ff5177eeSAlek Pinchuk uint64_t chunk_end, chunk_begin, chunk_len;
859ff5177eeSAlek Pinchuk uint64_t long_free_dirty_all_txgs = 0;
860ff5177eeSAlek Pinchuk dmu_tx_t *tx;
861713d6c20SMatthew Ahrens
862eb721827SAlek Pinchuk if (dmu_objset_zfs_unmounting(dn->dn_objset))
863eb721827SAlek Pinchuk return (SET_ERROR(EINTR));
864eb721827SAlek Pinchuk
865713d6c20SMatthew Ahrens chunk_end = chunk_begin = offset + length;
866713d6c20SMatthew Ahrens
867713d6c20SMatthew Ahrens /* move chunk_begin backwards to the beginning of this chunk */
868713d6c20SMatthew Ahrens err = get_next_chunk(dn, &chunk_begin, offset);
869cdb0ab79Smaybee if (err)
870cdb0ab79Smaybee return (err);
871713d6c20SMatthew Ahrens ASSERT3U(chunk_begin, >=, offset);
872713d6c20SMatthew Ahrens ASSERT3U(chunk_begin, <=, chunk_end);
873cdb0ab79Smaybee
874ff5177eeSAlek Pinchuk chunk_len = chunk_end - chunk_begin;
875ff5177eeSAlek Pinchuk
876ff5177eeSAlek Pinchuk mutex_enter(&dp->dp_lock);
877ff5177eeSAlek Pinchuk for (int t = 0; t < TXG_SIZE; t++) {
878ff5177eeSAlek Pinchuk long_free_dirty_all_txgs +=
879ff5177eeSAlek Pinchuk dp->dp_long_free_dirty_pertxg[t];
880ff5177eeSAlek Pinchuk }
881ff5177eeSAlek Pinchuk mutex_exit(&dp->dp_lock);
882ff5177eeSAlek Pinchuk
883ff5177eeSAlek Pinchuk /*
884ff5177eeSAlek Pinchuk * To avoid filling up a TXG with just frees wait for
885ff5177eeSAlek Pinchuk * the next TXG to open before freeing more chunks if
886ff5177eeSAlek Pinchuk * we have reached the threshold of frees
887ff5177eeSAlek Pinchuk */
888ff5177eeSAlek Pinchuk if (dirty_frees_threshold != 0 &&
889ff5177eeSAlek Pinchuk long_free_dirty_all_txgs >= dirty_frees_threshold) {
890084fd14fSBrian Behlendorf txg_wait_open(dp, 0, B_TRUE);
891ff5177eeSAlek Pinchuk continue;
892ff5177eeSAlek Pinchuk }
893ff5177eeSAlek Pinchuk
894ff5177eeSAlek Pinchuk tx = dmu_tx_create(os);
895ff5177eeSAlek Pinchuk dmu_tx_hold_free(tx, dn->dn_object, chunk_begin, chunk_len);
8964bb73804SMatthew Ahrens
8974bb73804SMatthew Ahrens /*
8984bb73804SMatthew Ahrens * Mark this transaction as typically resulting in a net
8994bb73804SMatthew Ahrens * reduction in space used.
9004bb73804SMatthew Ahrens */
9014bb73804SMatthew Ahrens dmu_tx_mark_netfree(tx);
902cdb0ab79Smaybee err = dmu_tx_assign(tx, TXG_WAIT);
903cdb0ab79Smaybee if (err) {
904cdb0ab79Smaybee dmu_tx_abort(tx);
905cdb0ab79Smaybee return (err);
906cdb0ab79Smaybee }
907ff5177eeSAlek Pinchuk
908ff5177eeSAlek Pinchuk mutex_enter(&dp->dp_lock);
909ff5177eeSAlek Pinchuk dp->dp_long_free_dirty_pertxg[dmu_tx_get_txg(tx) & TXG_MASK] +=
910ff5177eeSAlek Pinchuk chunk_len;
911ff5177eeSAlek Pinchuk mutex_exit(&dp->dp_lock);
912ff5177eeSAlek Pinchuk DTRACE_PROBE3(free__long__range,
913ff5177eeSAlek Pinchuk uint64_t, long_free_dirty_all_txgs, uint64_t, chunk_len,
914ff5177eeSAlek Pinchuk uint64_t, dmu_tx_get_txg(tx));
915ff5177eeSAlek Pinchuk dnode_free_range(dn, chunk_begin, chunk_len, tx);
916eb633035STom Caputi
917cdb0ab79Smaybee dmu_tx_commit(tx);
918713d6c20SMatthew Ahrens
919ff5177eeSAlek Pinchuk length -= chunk_len;
920cdb0ab79Smaybee }
921cdb0ab79Smaybee return (0);
922cdb0ab79Smaybee }
923cdb0ab79Smaybee
924cdb0ab79Smaybee int
dmu_free_long_range(objset_t * os,uint64_t object,uint64_t offset,uint64_t length)925cdb0ab79Smaybee dmu_free_long_range(objset_t *os, uint64_t object,
926cdb0ab79Smaybee uint64_t offset, uint64_t length)
927cdb0ab79Smaybee {
928cdb0ab79Smaybee dnode_t *dn;
929cdb0ab79Smaybee int err;
930cdb0ab79Smaybee
931503ad85cSMatthew Ahrens err = dnode_hold(os, object, FTAG, &dn);
932cdb0ab79Smaybee if (err != 0)
933cdb0ab79Smaybee return (err);
934713d6c20SMatthew Ahrens err = dmu_free_long_range_impl(os, dn, offset, length);
9355253393bSMatthew Ahrens
9365253393bSMatthew Ahrens /*
9375253393bSMatthew Ahrens * It is important to zero out the maxblkid when freeing the entire
9385253393bSMatthew Ahrens * file, so that (a) subsequent calls to dmu_free_long_range_impl()
9395253393bSMatthew Ahrens * will take the fast path, and (b) dnode_reallocate() can verify
9405253393bSMatthew Ahrens * that the entire file has been freed.
9415253393bSMatthew Ahrens */
94243466aaeSMax Grossman if (err == 0 && offset == 0 && length == DMU_OBJECT_END)
9435253393bSMatthew Ahrens dn->dn_maxblkid = 0;
9445253393bSMatthew Ahrens
945cdb0ab79Smaybee dnode_rele(dn, FTAG);
946cdb0ab79Smaybee return (err);
947cdb0ab79Smaybee }
948cdb0ab79Smaybee
949cdb0ab79Smaybee int
dmu_free_long_object(objset_t * os,uint64_t object)950713d6c20SMatthew Ahrens dmu_free_long_object(objset_t *os, uint64_t object)
951cdb0ab79Smaybee {
952cdb0ab79Smaybee dmu_tx_t *tx;
953cdb0ab79Smaybee int err;
954cdb0ab79Smaybee
955713d6c20SMatthew Ahrens err = dmu_free_long_range(os, object, 0, DMU_OBJECT_END);
956cdb0ab79Smaybee if (err != 0)
957cdb0ab79Smaybee return (err);
958713d6c20SMatthew Ahrens
959cdb0ab79Smaybee tx = dmu_tx_create(os);
960cdb0ab79Smaybee dmu_tx_hold_bonus(tx, object);
961713d6c20SMatthew Ahrens dmu_tx_hold_free(tx, object, 0, DMU_OBJECT_END);
9624bb73804SMatthew Ahrens dmu_tx_mark_netfree(tx);
963cdb0ab79Smaybee err = dmu_tx_assign(tx, TXG_WAIT);
964cdb0ab79Smaybee if (err == 0) {
965eb633035STom Caputi if (err == 0)
966713d6c20SMatthew Ahrens err = dmu_object_free(os, object, tx);
967eb633035STom Caputi
968cdb0ab79Smaybee dmu_tx_commit(tx);
969cdb0ab79Smaybee } else {
970cdb0ab79Smaybee dmu_tx_abort(tx);
971cdb0ab79Smaybee }
972713d6c20SMatthew Ahrens
973cdb0ab79Smaybee return (err);
974cdb0ab79Smaybee }
975cdb0ab79Smaybee
976ea8dc4b6Seschrock int
dmu_free_range(objset_t * os,uint64_t object,uint64_t offset,uint64_t size,dmu_tx_t * tx)977fa9e4066Sahrens dmu_free_range(objset_t *os, uint64_t object, uint64_t offset,
978fa9e4066Sahrens uint64_t size, dmu_tx_t *tx)
979fa9e4066Sahrens {
980ea8dc4b6Seschrock dnode_t *dn;
981503ad85cSMatthew Ahrens int err = dnode_hold(os, object, FTAG, &dn);
982ea8dc4b6Seschrock if (err)
983ea8dc4b6Seschrock return (err);
984fa9e4066Sahrens ASSERT(offset < UINT64_MAX);
985eb633035STom Caputi ASSERT(size == DMU_OBJECT_END || size <= UINT64_MAX - offset);
986fa9e4066Sahrens dnode_free_range(dn, offset, size, tx);
987fa9e4066Sahrens dnode_rele(dn, FTAG);
988ea8dc4b6Seschrock return (0);
989fa9e4066Sahrens }
990fa9e4066Sahrens
991b0c42cd4Sbzzz77 static int
dmu_read_impl(dnode_t * dn,uint64_t offset,uint64_t size,void * buf,uint32_t flags)992b0c42cd4Sbzzz77 dmu_read_impl(dnode_t *dn, uint64_t offset, uint64_t size,
9937bfdf011SNeil Perrin void *buf, uint32_t flags)
994fa9e4066Sahrens {
995fa9e4066Sahrens dmu_buf_t **dbp;
996b0c42cd4Sbzzz77 int numbufs, err = 0;
997feb08c6bSbillm
998feb08c6bSbillm /*
999feb08c6bSbillm * Deal with odd block sizes, where there can't be data past the first
1000feb08c6bSbillm * block. If we ever do the tail block optimization, we will need to
1001feb08c6bSbillm * handle that here as well.
1002feb08c6bSbillm */
1003c87b8fc5SMark J Musante if (dn->dn_maxblkid == 0) {
1004fa9e4066Sahrens int newsz = offset > dn->dn_datablksz ? 0 :
1005fa9e4066Sahrens MIN(size, dn->dn_datablksz - offset);
1006fa9e4066Sahrens bzero((char *)buf + newsz, size - newsz);
1007fa9e4066Sahrens size = newsz;
1008fa9e4066Sahrens }
1009fa9e4066Sahrens
1010fa9e4066Sahrens while (size > 0) {
1011fa9e4066Sahrens uint64_t mylen = MIN(size, DMU_MAX_ACCESS / 2);
1012c87b8fc5SMark J Musante int i;
1013fa9e4066Sahrens
1014fa9e4066Sahrens /*
1015fa9e4066Sahrens * NB: we could do this block-at-a-time, but it's nice
1016fa9e4066Sahrens * to be reading in parallel.
1017fa9e4066Sahrens */
1018a2eea2e1Sahrens err = dmu_buf_hold_array_by_dnode(dn, offset, mylen,
10197bfdf011SNeil Perrin TRUE, FTAG, &numbufs, &dbp, flags);
1020ea8dc4b6Seschrock if (err)
10211934e92fSmaybee break;
1022fa9e4066Sahrens
1023fa9e4066Sahrens for (i = 0; i < numbufs; i++) {
1024fa9e4066Sahrens int tocpy;
1025fa9e4066Sahrens int bufoff;
1026fa9e4066Sahrens dmu_buf_t *db = dbp[i];
1027fa9e4066Sahrens
1028fa9e4066Sahrens ASSERT(size > 0);
1029fa9e4066Sahrens
1030fa9e4066Sahrens bufoff = offset - db->db_offset;
1031fa9e4066Sahrens tocpy = (int)MIN(db->db_size - bufoff, size);
1032fa9e4066Sahrens
1033fa9e4066Sahrens bcopy((char *)db->db_data + bufoff, buf, tocpy);
1034fa9e4066Sahrens
1035fa9e4066Sahrens offset += tocpy;
1036fa9e4066Sahrens size -= tocpy;
1037fa9e4066Sahrens buf = (char *)buf + tocpy;
1038fa9e4066Sahrens }
1039ea8dc4b6Seschrock dmu_buf_rele_array(dbp, numbufs, FTAG);
1040fa9e4066Sahrens }
1041b0c42cd4Sbzzz77 return (err);
1042b0c42cd4Sbzzz77 }
1043b0c42cd4Sbzzz77
1044b0c42cd4Sbzzz77 int
dmu_read(objset_t * os,uint64_t object,uint64_t offset,uint64_t size,void * buf,uint32_t flags)1045b0c42cd4Sbzzz77 dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
1046b0c42cd4Sbzzz77 void *buf, uint32_t flags)
1047b0c42cd4Sbzzz77 {
1048b0c42cd4Sbzzz77 dnode_t *dn;
1049b0c42cd4Sbzzz77 int err;
1050b0c42cd4Sbzzz77
1051b0c42cd4Sbzzz77 err = dnode_hold(os, object, FTAG, &dn);
1052b0c42cd4Sbzzz77 if (err != 0)
1053b0c42cd4Sbzzz77 return (err);
1054b0c42cd4Sbzzz77
1055b0c42cd4Sbzzz77 err = dmu_read_impl(dn, offset, size, buf, flags);
1056a2eea2e1Sahrens dnode_rele(dn, FTAG);
10571934e92fSmaybee return (err);
1058fa9e4066Sahrens }
1059fa9e4066Sahrens
1060b0c42cd4Sbzzz77 int
dmu_read_by_dnode(dnode_t * dn,uint64_t offset,uint64_t size,void * buf,uint32_t flags)1061b0c42cd4Sbzzz77 dmu_read_by_dnode(dnode_t *dn, uint64_t offset, uint64_t size, void *buf,
1062b0c42cd4Sbzzz77 uint32_t flags)
1063b0c42cd4Sbzzz77 {
1064b0c42cd4Sbzzz77 return (dmu_read_impl(dn, offset, size, buf, flags));
1065b0c42cd4Sbzzz77 }
1066b0c42cd4Sbzzz77
1067b0c42cd4Sbzzz77 static void
dmu_write_impl(dmu_buf_t ** dbp,int numbufs,uint64_t offset,uint64_t size,const void * buf,dmu_tx_t * tx)1068b0c42cd4Sbzzz77 dmu_write_impl(dmu_buf_t **dbp, int numbufs, uint64_t offset, uint64_t size,
1069fa9e4066Sahrens const void *buf, dmu_tx_t *tx)
1070fa9e4066Sahrens {
1071b0c42cd4Sbzzz77 int i;
1072fa9e4066Sahrens
1073fa9e4066Sahrens for (i = 0; i < numbufs; i++) {
1074fa9e4066Sahrens int tocpy;
1075fa9e4066Sahrens int bufoff;
1076fa9e4066Sahrens dmu_buf_t *db = dbp[i];
1077fa9e4066Sahrens
1078fa9e4066Sahrens ASSERT(size > 0);
1079fa9e4066Sahrens
1080fa9e4066Sahrens bufoff = offset - db->db_offset;
1081fa9e4066Sahrens tocpy = (int)MIN(db->db_size - bufoff, size);
1082fa9e4066Sahrens
1083fa9e4066Sahrens ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
1084fa9e4066Sahrens
1085fa9e4066Sahrens if (tocpy == db->db_size)
1086fa9e4066Sahrens dmu_buf_will_fill(db, tx);
1087fa9e4066Sahrens else
1088fa9e4066Sahrens dmu_buf_will_dirty(db, tx);
1089fa9e4066Sahrens
1090fa9e4066Sahrens bcopy(buf, (char *)db->db_data + bufoff, tocpy);
1091fa9e4066Sahrens
1092fa9e4066Sahrens if (tocpy == db->db_size)
1093fa9e4066Sahrens dmu_buf_fill_done(db, tx);
1094fa9e4066Sahrens
1095fa9e4066Sahrens offset += tocpy;
1096fa9e4066Sahrens size -= tocpy;
1097fa9e4066Sahrens buf = (char *)buf + tocpy;
1098fa9e4066Sahrens }
1099b0c42cd4Sbzzz77 }
1100b0c42cd4Sbzzz77
1101b0c42cd4Sbzzz77 void
dmu_write(objset_t * os,uint64_t object,uint64_t offset,uint64_t size,const void * buf,dmu_tx_t * tx)1102b0c42cd4Sbzzz77 dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
1103b0c42cd4Sbzzz77 const void *buf, dmu_tx_t *tx)
1104b0c42cd4Sbzzz77 {
1105b0c42cd4Sbzzz77 dmu_buf_t **dbp;
1106b0c42cd4Sbzzz77 int numbufs;
1107b0c42cd4Sbzzz77
1108b0c42cd4Sbzzz77 if (size == 0)
1109b0c42cd4Sbzzz77 return;
1110b0c42cd4Sbzzz77
1111b0c42cd4Sbzzz77 VERIFY0(dmu_buf_hold_array(os, object, offset, size,
1112b0c42cd4Sbzzz77 FALSE, FTAG, &numbufs, &dbp));
1113b0c42cd4Sbzzz77 dmu_write_impl(dbp, numbufs, offset, size, buf, tx);
1114b0c42cd4Sbzzz77 dmu_buf_rele_array(dbp, numbufs, FTAG);
1115b0c42cd4Sbzzz77 }
1116b0c42cd4Sbzzz77
1117b0c42cd4Sbzzz77 void
dmu_write_by_dnode(dnode_t * dn,uint64_t offset,uint64_t size,const void * buf,dmu_tx_t * tx)1118b0c42cd4Sbzzz77 dmu_write_by_dnode(dnode_t *dn, uint64_t offset, uint64_t size,
1119b0c42cd4Sbzzz77 const void *buf, dmu_tx_t *tx)
1120b0c42cd4Sbzzz77 {
1121b0c42cd4Sbzzz77 dmu_buf_t **dbp;
1122b0c42cd4Sbzzz77 int numbufs;
1123b0c42cd4Sbzzz77
1124b0c42cd4Sbzzz77 if (size == 0)
1125b0c42cd4Sbzzz77 return;
1126b0c42cd4Sbzzz77
1127b0c42cd4Sbzzz77 VERIFY0(dmu_buf_hold_array_by_dnode(dn, offset, size,
1128b0c42cd4Sbzzz77 FALSE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH));
1129b0c42cd4Sbzzz77 dmu_write_impl(dbp, numbufs, offset, size, buf, tx);
1130ea8dc4b6Seschrock dmu_buf_rele_array(dbp, numbufs, FTAG);
1131fa9e4066Sahrens }
1132fa9e4066Sahrens
11335cabbc6bSPrashanth Sreenivasa static int
dmu_object_remap_one_indirect(objset_t * os,dnode_t * dn,uint64_t last_removal_txg,uint64_t offset)11345cabbc6bSPrashanth Sreenivasa dmu_object_remap_one_indirect(objset_t *os, dnode_t *dn,
11355cabbc6bSPrashanth Sreenivasa uint64_t last_removal_txg, uint64_t offset)
11365cabbc6bSPrashanth Sreenivasa {
11375cabbc6bSPrashanth Sreenivasa uint64_t l1blkid = dbuf_whichblock(dn, 1, offset);
11385cabbc6bSPrashanth Sreenivasa int err = 0;
11395cabbc6bSPrashanth Sreenivasa
11405cabbc6bSPrashanth Sreenivasa rw_enter(&dn->dn_struct_rwlock, RW_READER);
11415cabbc6bSPrashanth Sreenivasa dmu_buf_impl_t *dbuf = dbuf_hold_level(dn, 1, l1blkid, FTAG);
11425cabbc6bSPrashanth Sreenivasa ASSERT3P(dbuf, !=, NULL);
11435cabbc6bSPrashanth Sreenivasa
11445cabbc6bSPrashanth Sreenivasa /*
11455cabbc6bSPrashanth Sreenivasa * If the block hasn't been written yet, this default will ensure
11465cabbc6bSPrashanth Sreenivasa * we don't try to remap it.
11475cabbc6bSPrashanth Sreenivasa */
11485cabbc6bSPrashanth Sreenivasa uint64_t birth = UINT64_MAX;
11495cabbc6bSPrashanth Sreenivasa ASSERT3U(last_removal_txg, !=, UINT64_MAX);
11505cabbc6bSPrashanth Sreenivasa if (dbuf->db_blkptr != NULL)
11515cabbc6bSPrashanth Sreenivasa birth = dbuf->db_blkptr->blk_birth;
11525cabbc6bSPrashanth Sreenivasa rw_exit(&dn->dn_struct_rwlock);
11535cabbc6bSPrashanth Sreenivasa
11545cabbc6bSPrashanth Sreenivasa /*
11555cabbc6bSPrashanth Sreenivasa * If this L1 was already written after the last removal, then we've
11565cabbc6bSPrashanth Sreenivasa * already tried to remap it.
11575cabbc6bSPrashanth Sreenivasa */
11585cabbc6bSPrashanth Sreenivasa if (birth <= last_removal_txg &&
11595cabbc6bSPrashanth Sreenivasa dbuf_read(dbuf, NULL, DB_RF_MUST_SUCCEED) == 0 &&
11605cabbc6bSPrashanth Sreenivasa dbuf_can_remap(dbuf)) {
11615cabbc6bSPrashanth Sreenivasa dmu_tx_t *tx = dmu_tx_create(os);
11625cabbc6bSPrashanth Sreenivasa dmu_tx_hold_remap_l1indirect(tx, dn->dn_object);
11635cabbc6bSPrashanth Sreenivasa err = dmu_tx_assign(tx, TXG_WAIT);
11645cabbc6bSPrashanth Sreenivasa if (err == 0) {
11655cabbc6bSPrashanth Sreenivasa (void) dbuf_dirty(dbuf, tx);
11665cabbc6bSPrashanth Sreenivasa dmu_tx_commit(tx);
11675cabbc6bSPrashanth Sreenivasa } else {
11685cabbc6bSPrashanth Sreenivasa dmu_tx_abort(tx);
11695cabbc6bSPrashanth Sreenivasa }
11705cabbc6bSPrashanth Sreenivasa }
11715cabbc6bSPrashanth Sreenivasa
11725cabbc6bSPrashanth Sreenivasa dbuf_rele(dbuf, FTAG);
11735cabbc6bSPrashanth Sreenivasa
11745cabbc6bSPrashanth Sreenivasa delay(zfs_object_remap_one_indirect_delay_ticks);
11755cabbc6bSPrashanth Sreenivasa
11765cabbc6bSPrashanth Sreenivasa return (err);
11775cabbc6bSPrashanth Sreenivasa }
11785cabbc6bSPrashanth Sreenivasa
11795cabbc6bSPrashanth Sreenivasa /*
11805cabbc6bSPrashanth Sreenivasa * Remap all blockpointers in the object, if possible, so that they reference
11815cabbc6bSPrashanth Sreenivasa * only concrete vdevs.
11825cabbc6bSPrashanth Sreenivasa *
11835cabbc6bSPrashanth Sreenivasa * To do this, iterate over the L0 blockpointers and remap any that reference
11845cabbc6bSPrashanth Sreenivasa * an indirect vdev. Note that we only examine L0 blockpointers; since we
11855cabbc6bSPrashanth Sreenivasa * cannot guarantee that we can remap all blockpointer anyways (due to split
11865cabbc6bSPrashanth Sreenivasa * blocks), we do not want to make the code unnecessarily complicated to
11875cabbc6bSPrashanth Sreenivasa * catch the unlikely case that there is an L1 block on an indirect vdev that
11885cabbc6bSPrashanth Sreenivasa * contains no indirect blockpointers.
11895cabbc6bSPrashanth Sreenivasa */
11905cabbc6bSPrashanth Sreenivasa int
dmu_object_remap_indirects(objset_t * os,uint64_t object,uint64_t last_removal_txg)11915cabbc6bSPrashanth Sreenivasa dmu_object_remap_indirects(objset_t *os, uint64_t object,
11925cabbc6bSPrashanth Sreenivasa uint64_t last_removal_txg)
11935cabbc6bSPrashanth Sreenivasa {
11945cabbc6bSPrashanth Sreenivasa uint64_t offset, l1span;
11955cabbc6bSPrashanth Sreenivasa int err;
11965cabbc6bSPrashanth Sreenivasa dnode_t *dn;
11975cabbc6bSPrashanth Sreenivasa
11985cabbc6bSPrashanth Sreenivasa err = dnode_hold(os, object, FTAG, &dn);
11995cabbc6bSPrashanth Sreenivasa if (err != 0) {
12005cabbc6bSPrashanth Sreenivasa return (err);
12015cabbc6bSPrashanth Sreenivasa }
12025cabbc6bSPrashanth Sreenivasa
12035cabbc6bSPrashanth Sreenivasa if (dn->dn_nlevels <= 1) {
12045cabbc6bSPrashanth Sreenivasa if (issig(JUSTLOOKING) && issig(FORREAL)) {
12055cabbc6bSPrashanth Sreenivasa err = SET_ERROR(EINTR);
12065cabbc6bSPrashanth Sreenivasa }
12075cabbc6bSPrashanth Sreenivasa
12085cabbc6bSPrashanth Sreenivasa /*
12095cabbc6bSPrashanth Sreenivasa * If the dnode has no indirect blocks, we cannot dirty them.
12105cabbc6bSPrashanth Sreenivasa * We still want to remap the blkptr(s) in the dnode if
12115cabbc6bSPrashanth Sreenivasa * appropriate, so mark it as dirty.
12125cabbc6bSPrashanth Sreenivasa */
12135cabbc6bSPrashanth Sreenivasa if (err == 0 && dnode_needs_remap(dn)) {
12145cabbc6bSPrashanth Sreenivasa dmu_tx_t *tx = dmu_tx_create(os);
12155cabbc6bSPrashanth Sreenivasa dmu_tx_hold_bonus(tx, dn->dn_object);
12165cabbc6bSPrashanth Sreenivasa if ((err = dmu_tx_assign(tx, TXG_WAIT)) == 0) {
12175cabbc6bSPrashanth Sreenivasa dnode_setdirty(dn, tx);
12185cabbc6bSPrashanth Sreenivasa dmu_tx_commit(tx);
12195cabbc6bSPrashanth Sreenivasa } else {
12205cabbc6bSPrashanth Sreenivasa dmu_tx_abort(tx);
12215cabbc6bSPrashanth Sreenivasa }
12225cabbc6bSPrashanth Sreenivasa }
12235cabbc6bSPrashanth Sreenivasa
12245cabbc6bSPrashanth Sreenivasa dnode_rele(dn, FTAG);
12255cabbc6bSPrashanth Sreenivasa return (err);
12265cabbc6bSPrashanth Sreenivasa }
12275cabbc6bSPrashanth Sreenivasa
12285cabbc6bSPrashanth Sreenivasa offset = 0;
12295cabbc6bSPrashanth Sreenivasa l1span = 1ULL << (dn->dn_indblkshift - SPA_BLKPTRSHIFT +
12305cabbc6bSPrashanth Sreenivasa dn->dn_datablkshift);
12315cabbc6bSPrashanth Sreenivasa /*
12325cabbc6bSPrashanth Sreenivasa * Find the next L1 indirect that is not a hole.
12335cabbc6bSPrashanth Sreenivasa */
12345cabbc6bSPrashanth Sreenivasa while (dnode_next_offset(dn, 0, &offset, 2, 1, 0) == 0) {
12355cabbc6bSPrashanth Sreenivasa if (issig(JUSTLOOKING) && issig(FORREAL)) {
12365cabbc6bSPrashanth Sreenivasa err = SET_ERROR(EINTR);
12375cabbc6bSPrashanth Sreenivasa break;
12385cabbc6bSPrashanth Sreenivasa }
12395cabbc6bSPrashanth Sreenivasa if ((err = dmu_object_remap_one_indirect(os, dn,
12405cabbc6bSPrashanth Sreenivasa last_removal_txg, offset)) != 0) {
12415cabbc6bSPrashanth Sreenivasa break;
12425cabbc6bSPrashanth Sreenivasa }
12435cabbc6bSPrashanth Sreenivasa offset += l1span;
12445cabbc6bSPrashanth Sreenivasa }
12455cabbc6bSPrashanth Sreenivasa
12465cabbc6bSPrashanth Sreenivasa dnode_rele(dn, FTAG);
12475cabbc6bSPrashanth Sreenivasa return (err);
12485cabbc6bSPrashanth Sreenivasa }
12495cabbc6bSPrashanth Sreenivasa
125082c9918fSTim Haley void
dmu_prealloc(objset_t * os,uint64_t object,uint64_t offset,uint64_t size,dmu_tx_t * tx)125182c9918fSTim Haley dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
125282c9918fSTim Haley dmu_tx_t *tx)
125382c9918fSTim Haley {
125482c9918fSTim Haley dmu_buf_t **dbp;
125582c9918fSTim Haley int numbufs, i;
125682c9918fSTim Haley
125782c9918fSTim Haley if (size == 0)
125882c9918fSTim Haley return;
125982c9918fSTim Haley
126082c9918fSTim Haley VERIFY(0 == dmu_buf_hold_array(os, object, offset, size,
126182c9918fSTim Haley FALSE, FTAG, &numbufs, &dbp));
126282c9918fSTim Haley
126382c9918fSTim Haley for (i = 0; i < numbufs; i++) {
126482c9918fSTim Haley dmu_buf_t *db = dbp[i];
126582c9918fSTim Haley
126682c9918fSTim Haley dmu_buf_will_not_fill(db, tx);
126782c9918fSTim Haley }
126882c9918fSTim Haley dmu_buf_rele_array(dbp, numbufs, FTAG);
126982c9918fSTim Haley }
127082c9918fSTim Haley
12715d7b4d43SMatthew Ahrens void
dmu_write_embedded(objset_t * os,uint64_t object,uint64_t offset,void * data,uint8_t etype,uint8_t comp,int uncompressed_size,int compressed_size,int byteorder,dmu_tx_t * tx)12725d7b4d43SMatthew Ahrens dmu_write_embedded(objset_t *os, uint64_t object, uint64_t offset,
12735d7b4d43SMatthew Ahrens void *data, uint8_t etype, uint8_t comp, int uncompressed_size,
12745d7b4d43SMatthew Ahrens int compressed_size, int byteorder, dmu_tx_t *tx)
12755d7b4d43SMatthew Ahrens {
12765d7b4d43SMatthew Ahrens dmu_buf_t *db;
12775d7b4d43SMatthew Ahrens
12785d7b4d43SMatthew Ahrens ASSERT3U(etype, <, NUM_BP_EMBEDDED_TYPES);
12795d7b4d43SMatthew Ahrens ASSERT3U(comp, <, ZIO_COMPRESS_FUNCTIONS);
12805d7b4d43SMatthew Ahrens VERIFY0(dmu_buf_hold_noread(os, object, offset,
12815d7b4d43SMatthew Ahrens FTAG, &db));
12825d7b4d43SMatthew Ahrens
12835d7b4d43SMatthew Ahrens dmu_buf_write_embedded(db,
12845d7b4d43SMatthew Ahrens data, (bp_embedded_type_t)etype, (enum zio_compress)comp,
12855d7b4d43SMatthew Ahrens uncompressed_size, compressed_size, byteorder, tx);
12865d7b4d43SMatthew Ahrens
12875d7b4d43SMatthew Ahrens dmu_buf_rele(db, FTAG);
12885d7b4d43SMatthew Ahrens }
12895d7b4d43SMatthew Ahrens
1290c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /*
1291c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * DMU support for xuio
1292c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */
1293c242f9a0Schunli zhang - Sun Microsystems - Irvine United States kstat_t *xuio_ksp = NULL;
1294c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1295c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int
dmu_xuio_init(xuio_t * xuio,int nblk)1296c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_init(xuio_t *xuio, int nblk)
1297c242f9a0Schunli zhang - Sun Microsystems - Irvine United States {
1298c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_t *priv;
1299c242f9a0Schunli zhang - Sun Microsystems - Irvine United States uio_t *uio = &xuio->xu_uio;
1300c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1301c242f9a0Schunli zhang - Sun Microsystems - Irvine United States uio->uio_iovcnt = nblk;
1302c242f9a0Schunli zhang - Sun Microsystems - Irvine United States uio->uio_iov = kmem_zalloc(nblk * sizeof (iovec_t), KM_SLEEP);
1303c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1304c242f9a0Schunli zhang - Sun Microsystems - Irvine United States priv = kmem_zalloc(sizeof (dmu_xuio_t), KM_SLEEP);
1305c242f9a0Schunli zhang - Sun Microsystems - Irvine United States priv->cnt = nblk;
1306c242f9a0Schunli zhang - Sun Microsystems - Irvine United States priv->bufs = kmem_zalloc(nblk * sizeof (arc_buf_t *), KM_SLEEP);
1307c242f9a0Schunli zhang - Sun Microsystems - Irvine United States priv->iovp = uio->uio_iov;
1308c242f9a0Schunli zhang - Sun Microsystems - Irvine United States XUIO_XUZC_PRIV(xuio) = priv;
1309c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1310c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (XUIO_XUZC_RW(xuio) == UIO_READ)
1311c242f9a0Schunli zhang - Sun Microsystems - Irvine United States XUIOSTAT_INCR(xuiostat_onloan_rbuf, nblk);
1312c242f9a0Schunli zhang - Sun Microsystems - Irvine United States else
1313c242f9a0Schunli zhang - Sun Microsystems - Irvine United States XUIOSTAT_INCR(xuiostat_onloan_wbuf, nblk);
1314c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1315c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (0);
1316c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1317c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1318c242f9a0Schunli zhang - Sun Microsystems - Irvine United States void
dmu_xuio_fini(xuio_t * xuio)1319c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_fini(xuio_t *xuio)
1320c242f9a0Schunli zhang - Sun Microsystems - Irvine United States {
1321c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
1322c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int nblk = priv->cnt;
1323c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1324c242f9a0Schunli zhang - Sun Microsystems - Irvine United States kmem_free(priv->iovp, nblk * sizeof (iovec_t));
1325c242f9a0Schunli zhang - Sun Microsystems - Irvine United States kmem_free(priv->bufs, nblk * sizeof (arc_buf_t *));
1326c242f9a0Schunli zhang - Sun Microsystems - Irvine United States kmem_free(priv, sizeof (dmu_xuio_t));
1327c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1328c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (XUIO_XUZC_RW(xuio) == UIO_READ)
1329c242f9a0Schunli zhang - Sun Microsystems - Irvine United States XUIOSTAT_INCR(xuiostat_onloan_rbuf, -nblk);
1330c242f9a0Schunli zhang - Sun Microsystems - Irvine United States else
1331c242f9a0Schunli zhang - Sun Microsystems - Irvine United States XUIOSTAT_INCR(xuiostat_onloan_wbuf, -nblk);
1332c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1333c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1334c242f9a0Schunli zhang - Sun Microsystems - Irvine United States /*
1335c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * Initialize iov[priv->next] and priv->bufs[priv->next] with { off, n, abuf }
1336c242f9a0Schunli zhang - Sun Microsystems - Irvine United States * and increase priv->next by 1.
1337c242f9a0Schunli zhang - Sun Microsystems - Irvine United States */
1338c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int
dmu_xuio_add(xuio_t * xuio,arc_buf_t * abuf,offset_t off,size_t n)1339c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_add(xuio_t *xuio, arc_buf_t *abuf, offset_t off, size_t n)
1340c242f9a0Schunli zhang - Sun Microsystems - Irvine United States {
1341c242f9a0Schunli zhang - Sun Microsystems - Irvine United States struct iovec *iov;
1342c242f9a0Schunli zhang - Sun Microsystems - Irvine United States uio_t *uio = &xuio->xu_uio;
1343c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
1344c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int i = priv->next++;
1345c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1346c242f9a0Schunli zhang - Sun Microsystems - Irvine United States ASSERT(i < priv->cnt);
13475602294fSDan Kimmel ASSERT(off + n <= arc_buf_lsize(abuf));
1348c242f9a0Schunli zhang - Sun Microsystems - Irvine United States iov = uio->uio_iov + i;
1349c242f9a0Schunli zhang - Sun Microsystems - Irvine United States iov->iov_base = (char *)abuf->b_data + off;
1350c242f9a0Schunli zhang - Sun Microsystems - Irvine United States iov->iov_len = n;
1351c242f9a0Schunli zhang - Sun Microsystems - Irvine United States priv->bufs[i] = abuf;
1352c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (0);
1353c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1354c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1355c242f9a0Schunli zhang - Sun Microsystems - Irvine United States int
dmu_xuio_cnt(xuio_t * xuio)1356c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_cnt(xuio_t *xuio)
1357c242f9a0Schunli zhang - Sun Microsystems - Irvine United States {
1358c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
1359c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (priv->cnt);
1360c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1361c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1362c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *
dmu_xuio_arcbuf(xuio_t * xuio,int i)1363c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_arcbuf(xuio_t *xuio, int i)
1364c242f9a0Schunli zhang - Sun Microsystems - Irvine United States {
1365c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
1366c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1367c242f9a0Schunli zhang - Sun Microsystems - Irvine United States ASSERT(i < priv->cnt);
1368c242f9a0Schunli zhang - Sun Microsystems - Irvine United States return (priv->bufs[i]);
1369c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1370c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1371c242f9a0Schunli zhang - Sun Microsystems - Irvine United States void
dmu_xuio_clear(xuio_t * xuio,int i)1372c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_clear(xuio_t *xuio, int i)
1373c242f9a0Schunli zhang - Sun Microsystems - Irvine United States {
1374c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
1375c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1376c242f9a0Schunli zhang - Sun Microsystems - Irvine United States ASSERT(i < priv->cnt);
1377c242f9a0Schunli zhang - Sun Microsystems - Irvine United States priv->bufs[i] = NULL;
1378c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1379c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1380c242f9a0Schunli zhang - Sun Microsystems - Irvine United States static void
xuio_stat_init(void)1381c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_init(void)
1382c242f9a0Schunli zhang - Sun Microsystems - Irvine United States {
1383c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_ksp = kstat_create("zfs", 0, "xuio_stats", "misc",
1384c242f9a0Schunli zhang - Sun Microsystems - Irvine United States KSTAT_TYPE_NAMED, sizeof (xuio_stats) / sizeof (kstat_named_t),
1385c242f9a0Schunli zhang - Sun Microsystems - Irvine United States KSTAT_FLAG_VIRTUAL);
1386c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (xuio_ksp != NULL) {
1387c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_ksp->ks_data = &xuio_stats;
1388c242f9a0Schunli zhang - Sun Microsystems - Irvine United States kstat_install(xuio_ksp);
1389c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1390c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1391c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1392c242f9a0Schunli zhang - Sun Microsystems - Irvine United States static void
xuio_stat_fini(void)1393c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_fini(void)
1394c242f9a0Schunli zhang - Sun Microsystems - Irvine United States {
1395c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (xuio_ksp != NULL) {
1396c242f9a0Schunli zhang - Sun Microsystems - Irvine United States kstat_delete(xuio_ksp);
1397c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_ksp = NULL;
1398c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1399c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1400c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1401c242f9a0Schunli zhang - Sun Microsystems - Irvine United States void
xuio_stat_wbuf_copied(void)140299aa8b55SPrashanth Sreenivasa xuio_stat_wbuf_copied(void)
1403c242f9a0Schunli zhang - Sun Microsystems - Irvine United States {
1404c242f9a0Schunli zhang - Sun Microsystems - Irvine United States XUIOSTAT_BUMP(xuiostat_wbuf_copied);
1405c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1406c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1407c242f9a0Schunli zhang - Sun Microsystems - Irvine United States void
xuio_stat_wbuf_nocopy(void)140899aa8b55SPrashanth Sreenivasa xuio_stat_wbuf_nocopy(void)
1409c242f9a0Schunli zhang - Sun Microsystems - Irvine United States {
1410c242f9a0Schunli zhang - Sun Microsystems - Irvine United States XUIOSTAT_BUMP(xuiostat_wbuf_nocopy);
1411c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1412c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1413fa9e4066Sahrens #ifdef _KERNEL
14148dfe5547SRichard Yao int
dmu_read_uio_dnode(dnode_t * dn,uio_t * uio,uint64_t size)1415f8554bb9SMatthew Ahrens dmu_read_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size)
1416feb08c6bSbillm {
1417feb08c6bSbillm dmu_buf_t **dbp;
1418feb08c6bSbillm int numbufs, i, err;
1419c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_t *xuio = NULL;
1420feb08c6bSbillm
1421feb08c6bSbillm /*
1422feb08c6bSbillm * NB: we could do this block-at-a-time, but it's nice
1423feb08c6bSbillm * to be reading in parallel.
1424feb08c6bSbillm */
1425f8554bb9SMatthew Ahrens err = dmu_buf_hold_array_by_dnode(dn, uio->uio_loffset, size,
1426f8554bb9SMatthew Ahrens TRUE, FTAG, &numbufs, &dbp, 0);
1427feb08c6bSbillm if (err)
1428feb08c6bSbillm return (err);
1429feb08c6bSbillm
1430c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (uio->uio_extflg == UIO_XUIO)
1431c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio = (xuio_t *)uio;
1432c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1433feb08c6bSbillm for (i = 0; i < numbufs; i++) {
1434feb08c6bSbillm int tocpy;
1435feb08c6bSbillm int bufoff;
1436feb08c6bSbillm dmu_buf_t *db = dbp[i];
1437feb08c6bSbillm
1438feb08c6bSbillm ASSERT(size > 0);
1439feb08c6bSbillm
1440feb08c6bSbillm bufoff = uio->uio_loffset - db->db_offset;
1441feb08c6bSbillm tocpy = (int)MIN(db->db_size - bufoff, size);
1442feb08c6bSbillm
1443c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (xuio) {
1444c242f9a0Schunli zhang - Sun Microsystems - Irvine United States dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db;
1445c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *dbuf_abuf = dbi->db_buf;
1446c242f9a0Schunli zhang - Sun Microsystems - Irvine United States arc_buf_t *abuf = dbuf_loan_arcbuf(dbi);
1447c242f9a0Schunli zhang - Sun Microsystems - Irvine United States err = dmu_xuio_add(xuio, abuf, bufoff, tocpy);
1448c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (!err) {
1449c242f9a0Schunli zhang - Sun Microsystems - Irvine United States uio->uio_resid -= tocpy;
1450c242f9a0Schunli zhang - Sun Microsystems - Irvine United States uio->uio_loffset += tocpy;
1451c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1452c242f9a0Schunli zhang - Sun Microsystems - Irvine United States
1453c242f9a0Schunli zhang - Sun Microsystems - Irvine United States if (abuf == dbuf_abuf)
1454c242f9a0Schunli zhang - Sun Microsystems - Irvine United States XUIOSTAT_BUMP(xuiostat_rbuf_nocopy);
1455c242f9a0Schunli zhang - Sun Microsystems - Irvine United States else
1456c242f9a0Schunli zhang - Sun Microsystems - Irvine United States XUIOSTAT_BUMP(xuiostat_rbuf_copied);
1457c242f9a0Schunli zhang - Sun Microsystems - Irvine United States } else {
1458feb08c6bSbillm err = uiomove((char *)db->db_data + bufoff, tocpy,
1459feb08c6bSbillm UIO_READ, uio);
1460c242f9a0Schunli zhang - Sun Microsystems - Irvine United States }
1461feb08c6bSbillm if (err)
1462feb08c6bSbillm break;
1463feb08c6bSbillm
1464feb08c6bSbillm size -= tocpy;
1465feb08c6bSbillm }
1466feb08c6bSbillm dmu_buf_rele_array(dbp, numbufs, FTAG);
1467feb08c6bSbillm
1468feb08c6bSbillm return (err);
1469feb08c6bSbillm }
1470feb08c6bSbillm
1471f8554bb9SMatthew Ahrens /*
1472f8554bb9SMatthew Ahrens * Read 'size' bytes into the uio buffer.
1473f8554bb9SMatthew Ahrens * From object zdb->db_object.
1474f8554bb9SMatthew Ahrens * Starting at offset uio->uio_loffset.
1475f8554bb9SMatthew Ahrens *
1476f8554bb9SMatthew Ahrens * If the caller already has a dbuf in the target object
1477f8554bb9SMatthew Ahrens * (e.g. its bonus buffer), this routine is faster than dmu_read_uio(),
1478f8554bb9SMatthew Ahrens * because we don't have to find the dnode_t for the object.
1479f8554bb9SMatthew Ahrens */
1480f8554bb9SMatthew Ahrens int
dmu_read_uio_dbuf(dmu_buf_t * zdb,uio_t * uio,uint64_t size)1481f8554bb9SMatthew Ahrens dmu_read_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size)
1482f8554bb9SMatthew Ahrens {
1483f8554bb9SMatthew Ahrens dmu_buf_impl_t *db = (dmu_buf_impl_t *)zdb;
1484f8554bb9SMatthew Ahrens dnode_t *dn;
1485f8554bb9SMatthew Ahrens int err;
1486f8554bb9SMatthew Ahrens
1487f8554bb9SMatthew Ahrens if (size == 0)
1488f8554bb9SMatthew Ahrens return (0);
1489f8554bb9SMatthew Ahrens
1490f8554bb9SMatthew Ahrens DB_DNODE_ENTER(db);
1491f8554bb9SMatthew Ahrens dn = DB_DNODE(db);
1492f8554bb9SMatthew Ahrens err = dmu_read_uio_dnode(dn, uio, size);
1493f8554bb9SMatthew Ahrens DB_DNODE_EXIT(db);
1494f8554bb9SMatthew Ahrens
1495f8554bb9SMatthew Ahrens return (err);
1496f8554bb9SMatthew Ahrens }
1497f8554bb9SMatthew Ahrens
1498f8554bb9SMatthew Ahrens /*
1499f8554bb9SMatthew Ahrens * Read 'size' bytes into the uio buffer.
1500f8554bb9SMatthew Ahrens * From the specified object
1501f8554bb9SMatthew Ahrens * Starting at offset uio->uio_loffset.
1502f8554bb9SMatthew Ahrens */
1503f8554bb9SMatthew Ahrens int
dmu_read_uio(objset_t * os,uint64_t object,uio_t * uio,uint64_t size)1504f8554bb9SMatthew Ahrens dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size)
1505f8554bb9SMatthew Ahrens {
1506f8554bb9SMatthew Ahrens dnode_t *dn;
1507f8554bb9SMatthew Ahrens int err;
1508f8554bb9SMatthew Ahrens
1509f8554bb9SMatthew Ahrens if (size == 0)
1510f8554bb9SMatthew Ahrens return (0);
1511f8554bb9SMatthew Ahrens
1512f8554bb9SMatthew Ahrens err = dnode_hold(os, object, FTAG, &dn);
1513f8554bb9SMatthew Ahrens if (err)
1514f8554bb9SMatthew Ahrens return (err);
1515f8554bb9SMatthew Ahrens
1516f8554bb9SMatthew Ahrens err = dmu_read_uio_dnode(dn, uio, size);
1517f8554bb9SMatthew Ahrens
1518f8554bb9SMatthew Ahrens dnode_rele(dn, FTAG);
1519f8554bb9SMatthew Ahrens
1520f8554bb9SMatthew Ahrens return (err);
1521f8554bb9SMatthew Ahrens }
1522f8554bb9SMatthew Ahrens
15238dfe5547SRichard Yao int
dmu_write_uio_dnode(dnode_t * dn,uio_t * uio,uint64_t size,dmu_tx_t * tx)152494d1a210STim Haley dmu_write_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size, dmu_tx_t *tx)
1525fa9e4066Sahrens {
1526fa9e4066Sahrens dmu_buf_t **dbp;
152794d1a210STim Haley int numbufs;
1528fa9e4066Sahrens int err = 0;
152994d1a210STim Haley int i;
1530fa9e4066Sahrens
153194d1a210STim Haley err = dmu_buf_hold_array_by_dnode(dn, uio->uio_loffset, size,
153294d1a210STim Haley FALSE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH);
1533ea8dc4b6Seschrock if (err)
1534ea8dc4b6Seschrock return (err);
1535fa9e4066Sahrens
1536fa9e4066Sahrens for (i = 0; i < numbufs; i++) {
1537fa9e4066Sahrens int tocpy;
1538fa9e4066Sahrens int bufoff;
1539fa9e4066Sahrens dmu_buf_t *db = dbp[i];
1540fa9e4066Sahrens
1541fa9e4066Sahrens ASSERT(size > 0);
1542fa9e4066Sahrens
1543feb08c6bSbillm bufoff = uio->uio_loffset - db->db_offset;
1544fa9e4066Sahrens tocpy = (int)MIN(db->db_size - bufoff, size);
1545fa9e4066Sahrens
1546fa9e4066Sahrens ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
1547fa9e4066Sahrens
1548fa9e4066Sahrens if (tocpy == db->db_size)
1549fa9e4066Sahrens dmu_buf_will_fill(db, tx);
1550fa9e4066Sahrens else
1551fa9e4066Sahrens dmu_buf_will_dirty(db, tx);
1552fa9e4066Sahrens
1553fa9e4066Sahrens /*
1554fa9e4066Sahrens * XXX uiomove could block forever (eg. nfs-backed
1555fa9e4066Sahrens * pages). There needs to be a uiolockdown() function
1556fa9e4066Sahrens * to lock the pages in memory, so that uiomove won't
1557fa9e4066Sahrens * block.
1558fa9e4066Sahrens */
1559fa9e4066Sahrens err = uiomove((char *)db->db_data + bufoff, tocpy,
1560fa9e4066Sahrens UIO_WRITE, uio);
1561fa9e4066Sahrens
1562fa9e4066Sahrens if (tocpy == db->db_size)
1563fa9e4066Sahrens dmu_buf_fill_done(db, tx);
1564fa9e4066Sahrens
1565fa9e4066Sahrens if (err)
1566fa9e4066Sahrens break;
1567fa9e4066Sahrens
1568fa9e4066Sahrens size -= tocpy;
1569fa9e4066Sahrens }
157094d1a210STim Haley
1571ea8dc4b6Seschrock dmu_buf_rele_array(dbp, numbufs, FTAG);
1572fa9e4066Sahrens return (err);
1573fa9e4066Sahrens }
157444eda4d7Smaybee
1575f8554bb9SMatthew Ahrens /*
1576f8554bb9SMatthew Ahrens * Write 'size' bytes from the uio buffer.
1577f8554bb9SMatthew Ahrens * To object zdb->db_object.
1578f8554bb9SMatthew Ahrens * Starting at offset uio->uio_loffset.
1579f8554bb9SMatthew Ahrens *
1580f8554bb9SMatthew Ahrens * If the caller already has a dbuf in the target object
1581f8554bb9SMatthew Ahrens * (e.g. its bonus buffer), this routine is faster than dmu_write_uio(),
1582f8554bb9SMatthew Ahrens * because we don't have to find the dnode_t for the object.
1583f8554bb9SMatthew Ahrens */
158444eda4d7Smaybee int
dmu_write_uio_dbuf(dmu_buf_t * zdb,uio_t * uio,uint64_t size,dmu_tx_t * tx)158594d1a210STim Haley dmu_write_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size,
158694d1a210STim Haley dmu_tx_t *tx)
158794d1a210STim Haley {
1588744947dcSTom Erickson dmu_buf_impl_t *db = (dmu_buf_impl_t *)zdb;
1589744947dcSTom Erickson dnode_t *dn;
1590744947dcSTom Erickson int err;
1591744947dcSTom Erickson
159294d1a210STim Haley if (size == 0)
159394d1a210STim Haley return (0);
159494d1a210STim Haley
1595744947dcSTom Erickson DB_DNODE_ENTER(db);
1596744947dcSTom Erickson dn = DB_DNODE(db);
1597744947dcSTom Erickson err = dmu_write_uio_dnode(dn, uio, size, tx);
1598744947dcSTom Erickson DB_DNODE_EXIT(db);
1599744947dcSTom Erickson
1600744947dcSTom Erickson return (err);
160194d1a210STim Haley }
160294d1a210STim Haley
1603f8554bb9SMatthew Ahrens /*
1604f8554bb9SMatthew Ahrens * Write 'size' bytes from the uio buffer.
1605f8554bb9SMatthew Ahrens * To the specified object.
1606f8554bb9SMatthew Ahrens * Starting at offset uio->uio_loffset.
1607f8554bb9SMatthew Ahrens */
160894d1a210STim Haley int
dmu_write_uio(objset_t * os,uint64_t object,uio_t * uio,uint64_t size,dmu_tx_t * tx)160994d1a210STim Haley dmu_write_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size,
161094d1a210STim Haley dmu_tx_t *tx)
161194d1a210STim Haley {
161294d1a210STim Haley dnode_t *dn;
161394d1a210STim Haley int err;
161494d1a210STim Haley
161594d1a210STim Haley if (size == 0)
161694d1a210STim Haley return (0);
161794d1a210STim Haley
161894d1a210STim Haley err = dnode_hold(os, object, FTAG, &dn);
161994d1a210STim Haley if (err)
162094d1a210STim Haley return (err);
162194d1a210STim Haley
162294d1a210STim Haley err = dmu_write_uio_dnode(dn, uio, size, tx);
162394d1a210STim Haley
162494d1a210STim Haley dnode_rele(dn, FTAG);
162594d1a210STim Haley
162694d1a210STim Haley return (err);
162794d1a210STim Haley }
162894d1a210STim Haley
162994d1a210STim Haley int
dmu_write_pages(objset_t * os,uint64_t object,uint64_t offset,uint64_t size,page_t * pp,dmu_tx_t * tx)163044eda4d7Smaybee dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
163144eda4d7Smaybee page_t *pp, dmu_tx_t *tx)
163244eda4d7Smaybee {
163344eda4d7Smaybee dmu_buf_t **dbp;
163444eda4d7Smaybee int numbufs, i;
163544eda4d7Smaybee int err;
163644eda4d7Smaybee
163744eda4d7Smaybee if (size == 0)
163844eda4d7Smaybee return (0);
163944eda4d7Smaybee
164044eda4d7Smaybee err = dmu_buf_hold_array(os, object, offset, size,
164144eda4d7Smaybee FALSE, FTAG, &numbufs, &dbp);
164244eda4d7Smaybee if (err)
164344eda4d7Smaybee return (err);
164444eda4d7Smaybee
164544eda4d7Smaybee for (i = 0; i < numbufs; i++) {
164644eda4d7Smaybee int tocpy, copied, thiscpy;
164744eda4d7Smaybee int bufoff;
164844eda4d7Smaybee dmu_buf_t *db = dbp[i];
164944eda4d7Smaybee caddr_t va;
165044eda4d7Smaybee
165144eda4d7Smaybee ASSERT(size > 0);
165244eda4d7Smaybee ASSERT3U(db->db_size, >=, PAGESIZE);
165344eda4d7Smaybee
165444eda4d7Smaybee bufoff = offset - db->db_offset;
165544eda4d7Smaybee tocpy = (int)MIN(db->db_size - bufoff, size);
165644eda4d7Smaybee
165744eda4d7Smaybee ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
165844eda4d7Smaybee
165944eda4d7Smaybee if (tocpy == db->db_size)
166044eda4d7Smaybee dmu_buf_will_fill(db, tx);
166144eda4d7Smaybee else
166244eda4d7Smaybee dmu_buf_will_dirty(db, tx);
166344eda4d7Smaybee
166444eda4d7Smaybee for (copied = 0; copied < tocpy; copied += PAGESIZE) {
166544eda4d7Smaybee ASSERT3U(pp->p_offset, ==, db->db_offset + bufoff);
166644eda4d7Smaybee thiscpy = MIN(PAGESIZE, tocpy - copied);
16670fab61baSJonathan W Adams va = zfs_map_page(pp, S_READ);
166844eda4d7Smaybee bcopy(va, (char *)db->db_data + bufoff, thiscpy);
16690fab61baSJonathan W Adams zfs_unmap_page(pp, va);
167044eda4d7Smaybee pp = pp->p_next;
167144eda4d7Smaybee bufoff += PAGESIZE;
167244eda4d7Smaybee }
167344eda4d7Smaybee
167444eda4d7Smaybee if (tocpy == db->db_size)
167544eda4d7Smaybee dmu_buf_fill_done(db, tx);
167644eda4d7Smaybee
167744eda4d7Smaybee offset += tocpy;
167844eda4d7Smaybee size -= tocpy;
167944eda4d7Smaybee }
168044eda4d7Smaybee dmu_buf_rele_array(dbp, numbufs, FTAG);
168144eda4d7Smaybee return (err);
168244eda4d7Smaybee }
1683fa9e4066Sahrens #endif
1684fa9e4066Sahrens
16852fdbea25SAleksandr Guzovskiy /*
16862fdbea25SAleksandr Guzovskiy * Allocate a loaned anonymous arc buffer.
16872fdbea25SAleksandr Guzovskiy */
16882fdbea25SAleksandr Guzovskiy arc_buf_t *
dmu_request_arcbuf(dmu_buf_t * handle,int size)16892fdbea25SAleksandr Guzovskiy dmu_request_arcbuf(dmu_buf_t *handle, int size)
16902fdbea25SAleksandr Guzovskiy {
1691744947dcSTom Erickson dmu_buf_impl_t *db = (dmu_buf_impl_t *)handle;
16922fdbea25SAleksandr Guzovskiy
16935602294fSDan Kimmel return (arc_loan_buf(db->db_objset->os_spa, B_FALSE, size));
16942fdbea25SAleksandr Guzovskiy }
16952fdbea25SAleksandr Guzovskiy
16962fdbea25SAleksandr Guzovskiy /*
16972fdbea25SAleksandr Guzovskiy * Free a loaned arc buffer.
16982fdbea25SAleksandr Guzovskiy */
16992fdbea25SAleksandr Guzovskiy void
dmu_return_arcbuf(arc_buf_t * buf)17002fdbea25SAleksandr Guzovskiy dmu_return_arcbuf(arc_buf_t *buf)
17012fdbea25SAleksandr Guzovskiy {
17022fdbea25SAleksandr Guzovskiy arc_return_buf(buf, FTAG);
1703dcbf3bd6SGeorge Wilson arc_buf_destroy(buf, FTAG);
17042fdbea25SAleksandr Guzovskiy }
17052fdbea25SAleksandr Guzovskiy
1706eb633035STom Caputi void
dmu_copy_from_buf(objset_t * os,uint64_t object,uint64_t offset,dmu_buf_t * handle,dmu_tx_t * tx)1707eb633035STom Caputi dmu_copy_from_buf(objset_t *os, uint64_t object, uint64_t offset,
1708eb633035STom Caputi dmu_buf_t *handle, dmu_tx_t *tx)
1709eb633035STom Caputi {
1710eb633035STom Caputi dmu_buf_t *dst_handle;
1711eb633035STom Caputi dmu_buf_impl_t *dstdb;
1712eb633035STom Caputi dmu_buf_impl_t *srcdb = (dmu_buf_impl_t *)handle;
1713a60ca23dSTom Caputi dmu_object_type_t type;
1714eb633035STom Caputi arc_buf_t *abuf;
1715eb633035STom Caputi uint64_t datalen;
1716eb633035STom Caputi boolean_t byteorder;
1717eb633035STom Caputi uint8_t salt[ZIO_DATA_SALT_LEN];
1718eb633035STom Caputi uint8_t iv[ZIO_DATA_IV_LEN];
1719eb633035STom Caputi uint8_t mac[ZIO_DATA_MAC_LEN];
1720eb633035STom Caputi
1721eb633035STom Caputi ASSERT3P(srcdb->db_buf, !=, NULL);
1722eb633035STom Caputi
1723eb633035STom Caputi /* hold the db that we want to write to */
1724eb633035STom Caputi VERIFY0(dmu_buf_hold(os, object, offset, FTAG, &dst_handle,
1725eb633035STom Caputi DMU_READ_NO_DECRYPT));
1726eb633035STom Caputi dstdb = (dmu_buf_impl_t *)dst_handle;
1727eb633035STom Caputi datalen = arc_buf_size(srcdb->db_buf);
1728eb633035STom Caputi
1729a60ca23dSTom Caputi DB_DNODE_ENTER(dstdb);
1730a60ca23dSTom Caputi type = DB_DNODE(dstdb)->dn_type;
1731a60ca23dSTom Caputi DB_DNODE_EXIT(dstdb);
1732a60ca23dSTom Caputi
1733eb633035STom Caputi /* allocated an arc buffer that matches the type of srcdb->db_buf */
1734eb633035STom Caputi if (arc_is_encrypted(srcdb->db_buf)) {
1735eb633035STom Caputi arc_get_raw_params(srcdb->db_buf, &byteorder, salt, iv, mac);
1736eb633035STom Caputi abuf = arc_loan_raw_buf(os->os_spa, dmu_objset_id(os),
1737a60ca23dSTom Caputi byteorder, salt, iv, mac, type,
1738eb633035STom Caputi datalen, arc_buf_lsize(srcdb->db_buf),
1739eb633035STom Caputi arc_get_compression(srcdb->db_buf));
1740eb633035STom Caputi } else {
1741eb633035STom Caputi /* we won't get a compressed db back from dmu_buf_hold() */
1742eb633035STom Caputi ASSERT3U(arc_get_compression(srcdb->db_buf),
1743eb633035STom Caputi ==, ZIO_COMPRESS_OFF);
1744eb633035STom Caputi abuf = arc_loan_buf(os->os_spa,
1745a60ca23dSTom Caputi DMU_OT_IS_METADATA(type), datalen);
1746eb633035STom Caputi }
1747eb633035STom Caputi
1748eb633035STom Caputi ASSERT3U(datalen, ==, arc_buf_size(abuf));
1749eb633035STom Caputi
1750eb633035STom Caputi /* copy the data to the new buffer and assign it to the dstdb */
1751eb633035STom Caputi bcopy(srcdb->db_buf->b_data, abuf->b_data, datalen);
1752eb633035STom Caputi dbuf_assign_arcbuf(dstdb, abuf, tx);
1753eb633035STom Caputi dmu_buf_rele(dst_handle, FTAG);
1754eb633035STom Caputi }
1755eb633035STom Caputi
17562fdbea25SAleksandr Guzovskiy /*
17572fdbea25SAleksandr Guzovskiy * When possible directly assign passed loaned arc buffer to a dbuf.
17582fdbea25SAleksandr Guzovskiy * If this is not possible copy the contents of passed arc buf via
17592fdbea25SAleksandr Guzovskiy * dmu_write().
17602fdbea25SAleksandr Guzovskiy */
1761eb633035STom Caputi int
dmu_assign_arcbuf_by_dnode(dnode_t * dn,uint64_t offset,arc_buf_t * buf,dmu_tx_t * tx)1762eb633035STom Caputi dmu_assign_arcbuf_by_dnode(dnode_t *dn, uint64_t offset, arc_buf_t *buf,
17632fdbea25SAleksandr Guzovskiy dmu_tx_t *tx)
17642fdbea25SAleksandr Guzovskiy {
17652fdbea25SAleksandr Guzovskiy dmu_buf_impl_t *db;
1766eb633035STom Caputi objset_t *os = dn->dn_objset;
1767eb633035STom Caputi uint64_t object = dn->dn_object;
17685602294fSDan Kimmel uint32_t blksz = (uint32_t)arc_buf_lsize(buf);
17692fdbea25SAleksandr Guzovskiy uint64_t blkid;
17702fdbea25SAleksandr Guzovskiy
17712fdbea25SAleksandr Guzovskiy rw_enter(&dn->dn_struct_rwlock, RW_READER);
1772a2cdcdd2SPaul Dagnelie blkid = dbuf_whichblock(dn, 0, offset);
1773eb633035STom Caputi db = dbuf_hold(dn, blkid, FTAG);
1774eb633035STom Caputi if (db == NULL)
1775eb633035STom Caputi return (SET_ERROR(EIO));
17762fdbea25SAleksandr Guzovskiy rw_exit(&dn->dn_struct_rwlock);
17772fdbea25SAleksandr Guzovskiy
17788a904709SMatthew Ahrens /*
17798a904709SMatthew Ahrens * We can only assign if the offset is aligned, the arc buf is the
17805602294fSDan Kimmel * same size as the dbuf, and the dbuf is not metadata.
17818a904709SMatthew Ahrens */
17825602294fSDan Kimmel if (offset == db->db.db_offset && blksz == db->db.db_size) {
17832fdbea25SAleksandr Guzovskiy dbuf_assign_arcbuf(db, buf, tx);
17842fdbea25SAleksandr Guzovskiy dbuf_rele(db, FTAG);
17852fdbea25SAleksandr Guzovskiy } else {
17865602294fSDan Kimmel /* compressed bufs must always be assignable to their dbuf */
17875602294fSDan Kimmel ASSERT3U(arc_get_compression(buf), ==, ZIO_COMPRESS_OFF);
17885602294fSDan Kimmel ASSERT(!(buf->b_flags & ARC_BUF_FLAG_COMPRESSED));
17895602294fSDan Kimmel
1790744947dcSTom Erickson os = dn->dn_objset;
1791744947dcSTom Erickson object = dn->dn_object;
17922fdbea25SAleksandr Guzovskiy dbuf_rele(db, FTAG);
1793744947dcSTom Erickson dmu_write(os, object, offset, blksz, buf->b_data, tx);
17942fdbea25SAleksandr Guzovskiy dmu_return_arcbuf(buf);
1795c242f9a0Schunli zhang - Sun Microsystems - Irvine United States XUIOSTAT_BUMP(xuiostat_wbuf_copied);
17962fdbea25SAleksandr Guzovskiy }
1797eb633035STom Caputi
1798eb633035STom Caputi return (0);
17992fdbea25SAleksandr Guzovskiy }
18002fdbea25SAleksandr Guzovskiy
1801eb633035STom Caputi int
dmu_assign_arcbuf_by_dbuf(dmu_buf_t * handle,uint64_t offset,arc_buf_t * buf,dmu_tx_t * tx)1802eb633035STom Caputi dmu_assign_arcbuf_by_dbuf(dmu_buf_t *handle, uint64_t offset, arc_buf_t *buf,
18038dfe5547SRichard Yao dmu_tx_t *tx)
18048dfe5547SRichard Yao {
1805eb633035STom Caputi int err;
18068dfe5547SRichard Yao dmu_buf_impl_t *dbuf = (dmu_buf_impl_t *)handle;
18078dfe5547SRichard Yao
18088dfe5547SRichard Yao DB_DNODE_ENTER(dbuf);
1809eb633035STom Caputi err = dmu_assign_arcbuf_by_dnode(DB_DNODE(dbuf), offset, buf, tx);
18108dfe5547SRichard Yao DB_DNODE_EXIT(dbuf);
1811eb633035STom Caputi
1812eb633035STom Caputi return (err);
18138dfe5547SRichard Yao }
18148dfe5547SRichard Yao
1815c5c6ffa0Smaybee typedef struct {
1816b24ab676SJeff Bonwick dbuf_dirty_record_t *dsa_dr;
1817b24ab676SJeff Bonwick dmu_sync_cb_t *dsa_done;
1818b24ab676SJeff Bonwick zgd_t *dsa_zgd;
1819b24ab676SJeff Bonwick dmu_tx_t *dsa_tx;
1820c717a561Smaybee } dmu_sync_arg_t;
1821c5c6ffa0Smaybee
1822c5c6ffa0Smaybee /* ARGSUSED */
1823c5c6ffa0Smaybee static void
dmu_sync_ready(zio_t * zio,arc_buf_t * buf,void * varg)1824e14bb325SJeff Bonwick dmu_sync_ready(zio_t *zio, arc_buf_t *buf, void *varg)
1825e14bb325SJeff Bonwick {
1826b24ab676SJeff Bonwick dmu_sync_arg_t *dsa = varg;
1827b24ab676SJeff Bonwick dmu_buf_t *db = dsa->dsa_zgd->zgd_db;
1828e14bb325SJeff Bonwick blkptr_t *bp = zio->io_bp;
1829975c32a0SNeil Perrin
1830b24ab676SJeff Bonwick if (zio->io_error == 0) {
1831b24ab676SJeff Bonwick if (BP_IS_HOLE(bp)) {
1832b24ab676SJeff Bonwick /*
1833b24ab676SJeff Bonwick * A block of zeros may compress to a hole, but the
1834b24ab676SJeff Bonwick * block size still needs to be known for replay.
1835b24ab676SJeff Bonwick */
1836b24ab676SJeff Bonwick BP_SET_LSIZE(bp, db->db_size);
18375d7b4d43SMatthew Ahrens } else if (!BP_IS_EMBEDDED(bp)) {
1838e14bb325SJeff Bonwick ASSERT(BP_GET_LEVEL(bp) == 0);
1839eb633035STom Caputi BP_SET_FILL(bp, 1);
1840e14bb325SJeff Bonwick }
1841e14bb325SJeff Bonwick }
1842b24ab676SJeff Bonwick }
1843b24ab676SJeff Bonwick
1844b24ab676SJeff Bonwick static void
dmu_sync_late_arrival_ready(zio_t * zio)1845b24ab676SJeff Bonwick dmu_sync_late_arrival_ready(zio_t *zio)
1846b24ab676SJeff Bonwick {
1847b24ab676SJeff Bonwick dmu_sync_ready(zio, NULL, zio->io_private);
1848b24ab676SJeff Bonwick }
1849e14bb325SJeff Bonwick
1850e14bb325SJeff Bonwick /* ARGSUSED */
1851e14bb325SJeff Bonwick static void
dmu_sync_done(zio_t * zio,arc_buf_t * buf,void * varg)1852c5c6ffa0Smaybee dmu_sync_done(zio_t *zio, arc_buf_t *buf, void *varg)
1853c5c6ffa0Smaybee {
1854b24ab676SJeff Bonwick dmu_sync_arg_t *dsa = varg;
1855b24ab676SJeff Bonwick dbuf_dirty_record_t *dr = dsa->dsa_dr;
1856c717a561Smaybee dmu_buf_impl_t *db = dr->dr_dbuf;
1857cab3a55eSPrakash Surya zgd_t *zgd = dsa->dsa_zgd;
1858cab3a55eSPrakash Surya
1859cab3a55eSPrakash Surya /*
1860cab3a55eSPrakash Surya * Record the vdev(s) backing this blkptr so they can be flushed after
1861cab3a55eSPrakash Surya * the writes for the lwb have completed.
1862cab3a55eSPrakash Surya */
1863cab3a55eSPrakash Surya if (zio->io_error == 0) {
1864cab3a55eSPrakash Surya zil_lwb_add_block(zgd->zgd_lwb, zgd->zgd_bp);
1865cab3a55eSPrakash Surya }
1866c5c6ffa0Smaybee
1867b50a0fe0SNeil Perrin mutex_enter(&db->db_mtx);
1868b50a0fe0SNeil Perrin ASSERT(dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC);
1869b24ab676SJeff Bonwick if (zio->io_error == 0) {
187080901aeaSGeorge Wilson dr->dt.dl.dr_nopwrite = !!(zio->io_flags & ZIO_FLAG_NOPWRITE);
187180901aeaSGeorge Wilson if (dr->dt.dl.dr_nopwrite) {
187280901aeaSGeorge Wilson blkptr_t *bp = zio->io_bp;
187380901aeaSGeorge Wilson blkptr_t *bp_orig = &zio->io_bp_orig;
187480901aeaSGeorge Wilson uint8_t chksum = BP_GET_CHECKSUM(bp_orig);
187580901aeaSGeorge Wilson
187680901aeaSGeorge Wilson ASSERT(BP_EQUAL(bp, bp_orig));
1877b7edcb94SMatthew Ahrens VERIFY(BP_EQUAL(bp, db->db_blkptr));
187880901aeaSGeorge Wilson ASSERT(zio->io_prop.zp_compress != ZIO_COMPRESS_OFF);
187945818ee1SMatthew Ahrens ASSERT(zio_checksum_table[chksum].ci_flags &
188045818ee1SMatthew Ahrens ZCHECKSUM_FLAG_NOPWRITE);
188180901aeaSGeorge Wilson }
1882b24ab676SJeff Bonwick dr->dt.dl.dr_overridden_by = *zio->io_bp;
1883b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_OVERRIDDEN;
1884b24ab676SJeff Bonwick dr->dt.dl.dr_copies = zio->io_prop.zp_copies;
188570163ac5SPrakash Surya
188670163ac5SPrakash Surya /*
188770163ac5SPrakash Surya * Old style holes are filled with all zeros, whereas
188870163ac5SPrakash Surya * new-style holes maintain their lsize, type, level,
188970163ac5SPrakash Surya * and birth time (see zio_write_compress). While we
189070163ac5SPrakash Surya * need to reset the BP_SET_LSIZE() call that happened
189170163ac5SPrakash Surya * in dmu_sync_ready for old style holes, we do *not*
189270163ac5SPrakash Surya * want to wipe out the information contained in new
189370163ac5SPrakash Surya * style holes. Thus, only zero out the block pointer if
189470163ac5SPrakash Surya * it's an old style hole.
189570163ac5SPrakash Surya */
189670163ac5SPrakash Surya if (BP_IS_HOLE(&dr->dt.dl.dr_overridden_by) &&
189770163ac5SPrakash Surya dr->dt.dl.dr_overridden_by.blk_birth == 0)
1898b50a0fe0SNeil Perrin BP_ZERO(&dr->dt.dl.dr_overridden_by);
1899b24ab676SJeff Bonwick } else {
1900b24ab676SJeff Bonwick dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN;
1901b24ab676SJeff Bonwick }
1902c5c6ffa0Smaybee cv_broadcast(&db->db_changed);
1903b50a0fe0SNeil Perrin mutex_exit(&db->db_mtx);
1904b50a0fe0SNeil Perrin
1905b24ab676SJeff Bonwick dsa->dsa_done(dsa->dsa_zgd, zio->io_error);
1906c717a561Smaybee
1907b24ab676SJeff Bonwick kmem_free(dsa, sizeof (*dsa));
1908b24ab676SJeff Bonwick }
1909b24ab676SJeff Bonwick
1910b24ab676SJeff Bonwick static void
dmu_sync_late_arrival_done(zio_t * zio)1911b24ab676SJeff Bonwick dmu_sync_late_arrival_done(zio_t *zio)
1912b24ab676SJeff Bonwick {
1913b24ab676SJeff Bonwick blkptr_t *bp = zio->io_bp;
1914b24ab676SJeff Bonwick dmu_sync_arg_t *dsa = zio->io_private;
191580901aeaSGeorge Wilson blkptr_t *bp_orig = &zio->io_bp_orig;
1916cab3a55eSPrakash Surya zgd_t *zgd = dsa->dsa_zgd;
1917b24ab676SJeff Bonwick
1918cab3a55eSPrakash Surya if (zio->io_error == 0) {
1919cab3a55eSPrakash Surya /*
1920cab3a55eSPrakash Surya * Record the vdev(s) backing this blkptr so they can be
1921cab3a55eSPrakash Surya * flushed after the writes for the lwb have completed.
1922cab3a55eSPrakash Surya */
1923cab3a55eSPrakash Surya zil_lwb_add_block(zgd->zgd_lwb, zgd->zgd_bp);
1924cab3a55eSPrakash Surya
1925cab3a55eSPrakash Surya if (!BP_IS_HOLE(bp)) {
1926b7edcb94SMatthew Ahrens ASSERT(!(zio->io_flags & ZIO_FLAG_NOPWRITE));
192780901aeaSGeorge Wilson ASSERT(BP_IS_HOLE(bp_orig) || !BP_EQUAL(bp, bp_orig));
1928b24ab676SJeff Bonwick ASSERT(zio->io_bp->blk_birth == zio->io_txg);
1929b24ab676SJeff Bonwick ASSERT(zio->io_txg > spa_syncing_txg(zio->io_spa));
1930b24ab676SJeff Bonwick zio_free(zio->io_spa, zio->io_txg, zio->io_bp);
1931b24ab676SJeff Bonwick }
1932cab3a55eSPrakash Surya }
1933b24ab676SJeff Bonwick
1934b24ab676SJeff Bonwick dmu_tx_commit(dsa->dsa_tx);
1935b24ab676SJeff Bonwick
1936b24ab676SJeff Bonwick dsa->dsa_done(dsa->dsa_zgd, zio->io_error);
1937b24ab676SJeff Bonwick
1938770499e1SDan Kimmel abd_put(zio->io_abd);
1939b24ab676SJeff Bonwick kmem_free(dsa, sizeof (*dsa));
1940b24ab676SJeff Bonwick }
1941b24ab676SJeff Bonwick
1942b24ab676SJeff Bonwick static int
dmu_sync_late_arrival(zio_t * pio,objset_t * os,dmu_sync_cb_t * done,zgd_t * zgd,zio_prop_t * zp,zbookmark_phys_t * zb)1943b24ab676SJeff Bonwick dmu_sync_late_arrival(zio_t *pio, objset_t *os, dmu_sync_cb_t *done, zgd_t *zgd,
19447802d7bfSMatthew Ahrens zio_prop_t *zp, zbookmark_phys_t *zb)
1945b24ab676SJeff Bonwick {
1946b24ab676SJeff Bonwick dmu_sync_arg_t *dsa;
1947b24ab676SJeff Bonwick dmu_tx_t *tx;
1948b24ab676SJeff Bonwick
1949b24ab676SJeff Bonwick tx = dmu_tx_create(os);
1950b24ab676SJeff Bonwick dmu_tx_hold_space(tx, zgd->zgd_db->db_size);
19516e1f5caaSNeil Perrin if (dmu_tx_assign(tx, TXG_WAIT) != 0) {
1952b24ab676SJeff Bonwick dmu_tx_abort(tx);
1953be6fd75aSMatthew Ahrens /* Make zl_get_data do txg_waited_synced() */
1954be6fd75aSMatthew Ahrens return (SET_ERROR(EIO));
1955b24ab676SJeff Bonwick }
1956b24ab676SJeff Bonwick
19571271e4b1SPrakash Surya /*
19581271e4b1SPrakash Surya * In order to prevent the zgd's lwb from being free'd prior to
19591271e4b1SPrakash Surya * dmu_sync_late_arrival_done() being called, we have to ensure
19601271e4b1SPrakash Surya * the lwb's "max txg" takes this tx's txg into account.
19611271e4b1SPrakash Surya */
19621271e4b1SPrakash Surya zil_lwb_add_txg(zgd->zgd_lwb, dmu_tx_get_txg(tx));
19631271e4b1SPrakash Surya
1964b24ab676SJeff Bonwick dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_SLEEP);
1965b24ab676SJeff Bonwick dsa->dsa_dr = NULL;
1966b24ab676SJeff Bonwick dsa->dsa_done = done;
1967b24ab676SJeff Bonwick dsa->dsa_zgd = zgd;
1968b24ab676SJeff Bonwick dsa->dsa_tx = tx;
1969b24ab676SJeff Bonwick
1970b7edcb94SMatthew Ahrens /*
1971b7edcb94SMatthew Ahrens * Since we are currently syncing this txg, it's nontrivial to
1972b7edcb94SMatthew Ahrens * determine what BP to nopwrite against, so we disable nopwrite.
1973b7edcb94SMatthew Ahrens *
1974b7edcb94SMatthew Ahrens * When syncing, the db_blkptr is initially the BP of the previous
1975b7edcb94SMatthew Ahrens * txg. We can not nopwrite against it because it will be changed
1976b7edcb94SMatthew Ahrens * (this is similar to the non-late-arrival case where the dbuf is
1977b7edcb94SMatthew Ahrens * dirty in a future txg).
1978b7edcb94SMatthew Ahrens *
1979b7edcb94SMatthew Ahrens * Then dbuf_write_ready() sets bp_blkptr to the location we will write.
1980b7edcb94SMatthew Ahrens * We can not nopwrite against it because although the BP will not
1981b7edcb94SMatthew Ahrens * (typically) be changed, the data has not yet been persisted to this
1982b7edcb94SMatthew Ahrens * location.
1983b7edcb94SMatthew Ahrens *
1984b7edcb94SMatthew Ahrens * Finally, when dbuf_write_done() is called, it is theoretically
1985b7edcb94SMatthew Ahrens * possible to always nopwrite, because the data that was written in
1986b7edcb94SMatthew Ahrens * this txg is the same data that we are trying to write. However we
1987b7edcb94SMatthew Ahrens * would need to check that this dbuf is not dirty in any future
1988b7edcb94SMatthew Ahrens * txg's (as we do in the normal dmu_sync() path). For simplicity, we
1989b7edcb94SMatthew Ahrens * don't nopwrite in this case.
1990b7edcb94SMatthew Ahrens */
1991b7edcb94SMatthew Ahrens zp->zp_nopwrite = B_FALSE;
1992b7edcb94SMatthew Ahrens
19935602294fSDan Kimmel zio_nowait(zio_write(pio, os->os_spa, dmu_tx_get_txg(tx), zgd->zgd_bp,
1994770499e1SDan Kimmel abd_get_from_buf(zgd->zgd_db->db_data, zgd->zgd_db->db_size),
1995770499e1SDan Kimmel zgd->zgd_db->db_size, zgd->zgd_db->db_size, zp,
1996770499e1SDan Kimmel dmu_sync_late_arrival_ready, NULL, NULL, dmu_sync_late_arrival_done,
1997770499e1SDan Kimmel dsa, ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL, zb));
1998b24ab676SJeff Bonwick
1999b24ab676SJeff Bonwick return (0);
2000c5c6ffa0Smaybee }
2001c5c6ffa0Smaybee
2002fa9e4066Sahrens /*
2003c5c6ffa0Smaybee * Intent log support: sync the block associated with db to disk.
2004c5c6ffa0Smaybee * N.B. and XXX: the caller is responsible for making sure that the
2005c5c6ffa0Smaybee * data isn't changing while dmu_sync() is writing it.
2006fa9e4066Sahrens *
2007fa9e4066Sahrens * Return values:
2008fa9e4066Sahrens *
200980901aeaSGeorge Wilson * EEXIST: this txg has already been synced, so there's nothing to do.
2010fa9e4066Sahrens * The caller should not log the write.
2011fa9e4066Sahrens *
2012fa9e4066Sahrens * ENOENT: the block was dbuf_free_range()'d, so there's nothing to do.
2013fa9e4066Sahrens * The caller should not log the write.
2014fa9e4066Sahrens *
2015c5c6ffa0Smaybee * EALREADY: this block is already in the process of being synced.
2016c5c6ffa0Smaybee * The caller should track its progress (somehow).
2017fa9e4066Sahrens *
2018b24ab676SJeff Bonwick * EIO: could not do the I/O.
2019b24ab676SJeff Bonwick * The caller should do a txg_wait_synced().
2020fa9e4066Sahrens *
2021b24ab676SJeff Bonwick * 0: the I/O has been initiated.
2022b24ab676SJeff Bonwick * The caller should log this blkptr in the done callback.
2023b24ab676SJeff Bonwick * It is possible that the I/O will fail, in which case
2024b24ab676SJeff Bonwick * the error will be reported to the done callback and
2025b24ab676SJeff Bonwick * propagated to pio from zio_done().
2026fa9e4066Sahrens */
2027fa9e4066Sahrens int
dmu_sync(zio_t * pio,uint64_t txg,dmu_sync_cb_t * done,zgd_t * zgd)2028b24ab676SJeff Bonwick dmu_sync(zio_t *pio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd)
2029fa9e4066Sahrens {
2030b24ab676SJeff Bonwick dmu_buf_impl_t *db = (dmu_buf_impl_t *)zgd->zgd_db;
2031503ad85cSMatthew Ahrens objset_t *os = db->db_objset;
2032b24ab676SJeff Bonwick dsl_dataset_t *ds = os->os_dsl_dataset;
2033c717a561Smaybee dbuf_dirty_record_t *dr;
2034b24ab676SJeff Bonwick dmu_sync_arg_t *dsa;
20357802d7bfSMatthew Ahrens zbookmark_phys_t zb;
2036b24ab676SJeff Bonwick zio_prop_t zp;
2037744947dcSTom Erickson dnode_t *dn;
2038fa9e4066Sahrens
2039b24ab676SJeff Bonwick ASSERT(pio != NULL);
2040fa9e4066Sahrens ASSERT(txg != 0);
2041fa9e4066Sahrens
2042b24ab676SJeff Bonwick SET_BOOKMARK(&zb, ds->ds_object,
2043b24ab676SJeff Bonwick db->db.db_object, db->db_level, db->db_blkid);
2044b24ab676SJeff Bonwick
2045744947dcSTom Erickson DB_DNODE_ENTER(db);
2046744947dcSTom Erickson dn = DB_DNODE(db);
2047adaec86aSMatthew Ahrens dmu_write_policy(os, dn, db->db_level, WP_DMU_SYNC, &zp);
2048744947dcSTom Erickson DB_DNODE_EXIT(db);
2049fa9e4066Sahrens
2050fa9e4066Sahrens /*
2051b24ab676SJeff Bonwick * If we're frozen (running ziltest), we always need to generate a bp.
2052ea8dc4b6Seschrock */
2053b24ab676SJeff Bonwick if (txg > spa_freeze_txg(os->os_spa))
2054b24ab676SJeff Bonwick return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb));
2055ea8dc4b6Seschrock
2056ea8dc4b6Seschrock /*
2057b24ab676SJeff Bonwick * Grabbing db_mtx now provides a barrier between dbuf_sync_leaf()
2058b24ab676SJeff Bonwick * and us. If we determine that this txg is not yet syncing,
2059b24ab676SJeff Bonwick * but it begins to sync a moment later, that's OK because the
2060b24ab676SJeff Bonwick * sync thread will block in dbuf_sync_leaf() until we drop db_mtx.
2061fa9e4066Sahrens */
2062b24ab676SJeff Bonwick mutex_enter(&db->db_mtx);
2063b24ab676SJeff Bonwick
2064b24ab676SJeff Bonwick if (txg <= spa_last_synced_txg(os->os_spa)) {
2065fa9e4066Sahrens /*
2066b24ab676SJeff Bonwick * This txg has already synced. There's nothing to do.
2067fa9e4066Sahrens */
2068b24ab676SJeff Bonwick mutex_exit(&db->db_mtx);
2069be6fd75aSMatthew Ahrens return (SET_ERROR(EEXIST));
2070fa9e4066Sahrens }
2071fa9e4066Sahrens
2072b24ab676SJeff Bonwick if (txg <= spa_syncing_txg(os->os_spa)) {
2073c5c6ffa0Smaybee /*
2074b24ab676SJeff Bonwick * This txg is currently syncing, so we can't mess with
2075b24ab676SJeff Bonwick * the dirty record anymore; just write a new log block.
2076c5c6ffa0Smaybee */
207713506d1eSmaybee mutex_exit(&db->db_mtx);
2078b24ab676SJeff Bonwick return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb));
2079c5c6ffa0Smaybee }
2080c5c6ffa0Smaybee
2081c717a561Smaybee dr = db->db_last_dirty;
2082b24ab676SJeff Bonwick while (dr && dr->dr_txg != txg)
2083c717a561Smaybee dr = dr->dr_next;
2084b24ab676SJeff Bonwick
2085b24ab676SJeff Bonwick if (dr == NULL) {
2086c5c6ffa0Smaybee /*
2087b24ab676SJeff Bonwick * There's no dr for this dbuf, so it must have been freed.
2088fa9e4066Sahrens * There's no need to log writes to freed blocks, so we're done.
2089fa9e4066Sahrens */
2090fa9e4066Sahrens mutex_exit(&db->db_mtx);
2091be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT));
2092fa9e4066Sahrens }
2093fa9e4066Sahrens
209480901aeaSGeorge Wilson ASSERT(dr->dr_next == NULL || dr->dr_next->dr_txg < txg);
209580901aeaSGeorge Wilson
2096b7edcb94SMatthew Ahrens if (db->db_blkptr != NULL) {
2097b7edcb94SMatthew Ahrens /*
2098b7edcb94SMatthew Ahrens * We need to fill in zgd_bp with the current blkptr so that
2099b7edcb94SMatthew Ahrens * the nopwrite code can check if we're writing the same
2100b7edcb94SMatthew Ahrens * data that's already on disk. We can only nopwrite if we
2101b7edcb94SMatthew Ahrens * are sure that after making the copy, db_blkptr will not
2102b7edcb94SMatthew Ahrens * change until our i/o completes. We ensure this by
2103b7edcb94SMatthew Ahrens * holding the db_mtx, and only allowing nopwrite if the
2104b7edcb94SMatthew Ahrens * block is not already dirty (see below). This is verified
2105b7edcb94SMatthew Ahrens * by dmu_sync_done(), which VERIFYs that the db_blkptr has
2106b7edcb94SMatthew Ahrens * not changed.
2107b7edcb94SMatthew Ahrens */
2108b7edcb94SMatthew Ahrens *zgd->zgd_bp = *db->db_blkptr;
2109b7edcb94SMatthew Ahrens }
2110b7edcb94SMatthew Ahrens
211180901aeaSGeorge Wilson /*
211234e8acefSMatthew Ahrens * Assume the on-disk data is X, the current syncing data (in
211334e8acefSMatthew Ahrens * txg - 1) is Y, and the current in-memory data is Z (currently
211434e8acefSMatthew Ahrens * in dmu_sync).
211534e8acefSMatthew Ahrens *
211634e8acefSMatthew Ahrens * We usually want to perform a nopwrite if X and Z are the
211734e8acefSMatthew Ahrens * same. However, if Y is different (i.e. the BP is going to
211834e8acefSMatthew Ahrens * change before this write takes effect), then a nopwrite will
211934e8acefSMatthew Ahrens * be incorrect - we would override with X, which could have
212034e8acefSMatthew Ahrens * been freed when Y was written.
212134e8acefSMatthew Ahrens *
212234e8acefSMatthew Ahrens * (Note that this is not a concern when we are nop-writing from
212334e8acefSMatthew Ahrens * syncing context, because X and Y must be identical, because
212434e8acefSMatthew Ahrens * all previous txgs have been synced.)
212534e8acefSMatthew Ahrens *
212634e8acefSMatthew Ahrens * Therefore, we disable nopwrite if the current BP could change
212734e8acefSMatthew Ahrens * before this TXG. There are two ways it could change: by
212834e8acefSMatthew Ahrens * being dirty (dr_next is non-NULL), or by being freed
212934e8acefSMatthew Ahrens * (dnode_block_freed()). This behavior is verified by
213034e8acefSMatthew Ahrens * zio_done(), which VERIFYs that the override BP is identical
213134e8acefSMatthew Ahrens * to the on-disk BP.
213280901aeaSGeorge Wilson */
213334e8acefSMatthew Ahrens DB_DNODE_ENTER(db);
213434e8acefSMatthew Ahrens dn = DB_DNODE(db);
213534e8acefSMatthew Ahrens if (dr->dr_next != NULL || dnode_block_freed(dn, db->db_blkid))
213680901aeaSGeorge Wilson zp.zp_nopwrite = B_FALSE;
213734e8acefSMatthew Ahrens DB_DNODE_EXIT(db);
213880901aeaSGeorge Wilson
2139c717a561Smaybee ASSERT(dr->dr_txg == txg);
2140b24ab676SJeff Bonwick if (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC ||
2141b24ab676SJeff Bonwick dr->dt.dl.dr_override_state == DR_OVERRIDDEN) {
2142c5c6ffa0Smaybee /*
2143b24ab676SJeff Bonwick * We have already issued a sync write for this buffer,
2144b24ab676SJeff Bonwick * or this buffer has already been synced. It could not
2145c717a561Smaybee * have been dirtied since, or we would have cleared the state.
2146c717a561Smaybee */
2147c717a561Smaybee mutex_exit(&db->db_mtx);
2148be6fd75aSMatthew Ahrens return (SET_ERROR(EALREADY));
2149c717a561Smaybee }
2150c717a561Smaybee
2151b24ab676SJeff Bonwick ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN);
2152c717a561Smaybee dr->dt.dl.dr_override_state = DR_IN_DMU_SYNC;
2153fa9e4066Sahrens mutex_exit(&db->db_mtx);
2154fa9e4066Sahrens
2155b24ab676SJeff Bonwick dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_SLEEP);
2156b24ab676SJeff Bonwick dsa->dsa_dr = dr;
2157b24ab676SJeff Bonwick dsa->dsa_done = done;
2158b24ab676SJeff Bonwick dsa->dsa_zgd = zgd;
2159b24ab676SJeff Bonwick dsa->dsa_tx = NULL;
2160e14bb325SJeff Bonwick
2161b24ab676SJeff Bonwick zio_nowait(arc_write(pio, os->os_spa, txg,
2162b7edcb94SMatthew Ahrens zgd->zgd_bp, dr->dt.dl.dr_data, DBUF_IS_L2CACHEABLE(db),
2163dcbf3bd6SGeorge Wilson &zp, dmu_sync_ready, NULL, NULL, dmu_sync_done, dsa,
21648df0bcf0SPaul Dagnelie ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL, &zb));
2165e14bb325SJeff Bonwick
2166b24ab676SJeff Bonwick return (0);
2167fa9e4066Sahrens }
2168fa9e4066Sahrens
2169fa9e4066Sahrens int
dmu_object_set_nlevels(objset_t * os,uint64_t object,int nlevels,dmu_tx_t * tx)2170eb633035STom Caputi dmu_object_set_nlevels(objset_t *os, uint64_t object, int nlevels, dmu_tx_t *tx)
2171eb633035STom Caputi {
2172eb633035STom Caputi dnode_t *dn;
2173eb633035STom Caputi int err;
2174eb633035STom Caputi
2175eb633035STom Caputi err = dnode_hold(os, object, FTAG, &dn);
2176eb633035STom Caputi if (err)
2177eb633035STom Caputi return (err);
2178eb633035STom Caputi err = dnode_set_nlevels(dn, nlevels, tx);
2179eb633035STom Caputi dnode_rele(dn, FTAG);
2180eb633035STom Caputi return (err);
2181eb633035STom Caputi }
2182eb633035STom Caputi
2183eb633035STom Caputi int
dmu_object_set_blocksize(objset_t * os,uint64_t object,uint64_t size,int ibs,dmu_tx_t * tx)2184fa9e4066Sahrens dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, int ibs,
2185fa9e4066Sahrens dmu_tx_t *tx)
2186fa9e4066Sahrens {
2187ea8dc4b6Seschrock dnode_t *dn;
2188ea8dc4b6Seschrock int err;
2189ea8dc4b6Seschrock
2190503ad85cSMatthew Ahrens err = dnode_hold(os, object, FTAG, &dn);
2191ea8dc4b6Seschrock if (err)
2192ea8dc4b6Seschrock return (err);
2193ea8dc4b6Seschrock err = dnode_set_blksz(dn, size, ibs, tx);
2194fa9e4066Sahrens dnode_rele(dn, FTAG);
2195fa9e4066Sahrens return (err);
2196fa9e4066Sahrens }
2197fa9e4066Sahrens
2198eb633035STom Caputi int
dmu_object_set_maxblkid(objset_t * os,uint64_t object,uint64_t maxblkid,dmu_tx_t * tx)2199eb633035STom Caputi dmu_object_set_maxblkid(objset_t *os, uint64_t object, uint64_t maxblkid,
2200eb633035STom Caputi dmu_tx_t *tx)
2201eb633035STom Caputi {
2202eb633035STom Caputi dnode_t *dn;
2203eb633035STom Caputi int err;
2204eb633035STom Caputi
2205eb633035STom Caputi err = dnode_hold(os, object, FTAG, &dn);
2206eb633035STom Caputi if (err)
2207eb633035STom Caputi return (err);
2208eb633035STom Caputi rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
2209eb633035STom Caputi dnode_new_blkid(dn, maxblkid, tx, B_FALSE, B_TRUE);
2210eb633035STom Caputi rw_exit(&dn->dn_struct_rwlock);
2211eb633035STom Caputi dnode_rele(dn, FTAG);
2212eb633035STom Caputi return (0);
2213eb633035STom Caputi }
2214eb633035STom Caputi
2215fa9e4066Sahrens void
dmu_object_set_checksum(objset_t * os,uint64_t object,uint8_t checksum,dmu_tx_t * tx)2216fa9e4066Sahrens dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum,
2217fa9e4066Sahrens dmu_tx_t *tx)
2218fa9e4066Sahrens {
2219ea8dc4b6Seschrock dnode_t *dn;
2220ea8dc4b6Seschrock
22215d7b4d43SMatthew Ahrens /*
22225d7b4d43SMatthew Ahrens * Send streams include each object's checksum function. This
22235d7b4d43SMatthew Ahrens * check ensures that the receiving system can understand the
22245d7b4d43SMatthew Ahrens * checksum function transmitted.
22255d7b4d43SMatthew Ahrens */
22265d7b4d43SMatthew Ahrens ASSERT3U(checksum, <, ZIO_CHECKSUM_LEGACY_FUNCTIONS);
22275d7b4d43SMatthew Ahrens
22285d7b4d43SMatthew Ahrens VERIFY0(dnode_hold(os, object, FTAG, &dn));
22295d7b4d43SMatthew Ahrens ASSERT3U(checksum, <, ZIO_CHECKSUM_FUNCTIONS);
2230fa9e4066Sahrens dn->dn_checksum = checksum;
2231fa9e4066Sahrens dnode_setdirty(dn, tx);
2232fa9e4066Sahrens dnode_rele(dn, FTAG);
2233fa9e4066Sahrens }
2234fa9e4066Sahrens
2235fa9e4066Sahrens void
dmu_object_set_compress(objset_t * os,uint64_t object,uint8_t compress,dmu_tx_t * tx)2236fa9e4066Sahrens dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress,
2237fa9e4066Sahrens dmu_tx_t *tx)
2238fa9e4066Sahrens {
2239ea8dc4b6Seschrock dnode_t *dn;
2240ea8dc4b6Seschrock
22415d7b4d43SMatthew Ahrens /*
22425d7b4d43SMatthew Ahrens * Send streams include each object's compression function. This
22435d7b4d43SMatthew Ahrens * check ensures that the receiving system can understand the
22445d7b4d43SMatthew Ahrens * compression function transmitted.
22455d7b4d43SMatthew Ahrens */
22465d7b4d43SMatthew Ahrens ASSERT3U(compress, <, ZIO_COMPRESS_LEGACY_FUNCTIONS);
22475d7b4d43SMatthew Ahrens
22485d7b4d43SMatthew Ahrens VERIFY0(dnode_hold(os, object, FTAG, &dn));
2249fa9e4066Sahrens dn->dn_compress = compress;
2250fa9e4066Sahrens dnode_setdirty(dn, tx);
2251fa9e4066Sahrens dnode_rele(dn, FTAG);
2252fa9e4066Sahrens }
2253fa9e4066Sahrens
2254edf345e6SMatthew Ahrens /*
2255edf345e6SMatthew Ahrens * When the "redundant_metadata" property is set to "most", only indirect
2256edf345e6SMatthew Ahrens * blocks of this level and higher will have an additional ditto block.
2257edf345e6SMatthew Ahrens */
2258edf345e6SMatthew Ahrens int zfs_redundant_metadata_most_ditto_level = 2;
2259edf345e6SMatthew Ahrens
2260b24ab676SJeff Bonwick void
dmu_write_policy(objset_t * os,dnode_t * dn,int level,int wp,zio_prop_t * zp)2261adaec86aSMatthew Ahrens dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp, zio_prop_t *zp)
2262b24ab676SJeff Bonwick {
2263b24ab676SJeff Bonwick dmu_object_type_t type = dn ? dn->dn_type : DMU_OT_OBJSET;
2264ad135b5dSChristopher Siden boolean_t ismd = (level > 0 || DMU_OT_IS_METADATA(type) ||
22651d8ccc7bSMark Shellenbaum (wp & WP_SPILL));
2266b24ab676SJeff Bonwick enum zio_checksum checksum = os->os_checksum;
2267b24ab676SJeff Bonwick enum zio_compress compress = os->os_compress;
2268b24ab676SJeff Bonwick enum zio_checksum dedup_checksum = os->os_dedup_checksum;
22697540df39SGeorge Wilson boolean_t dedup = B_FALSE;
22707540df39SGeorge Wilson boolean_t nopwrite = B_FALSE;
2271b24ab676SJeff Bonwick boolean_t dedup_verify = os->os_dedup_verify;
2272eb633035STom Caputi boolean_t encrypt = B_FALSE;
2273b24ab676SJeff Bonwick int copies = os->os_copies;
2274b24ab676SJeff Bonwick
2275b24ab676SJeff Bonwick /*
227680901aeaSGeorge Wilson * We maintain different write policies for each of the following
227780901aeaSGeorge Wilson * types of data:
227880901aeaSGeorge Wilson * 1. metadata
227980901aeaSGeorge Wilson * 2. preallocated blocks (i.e. level-0 blocks of a dump device)
228080901aeaSGeorge Wilson * 3. all other level 0 blocks
2281b24ab676SJeff Bonwick */
2282b24ab676SJeff Bonwick if (ismd) {
2283b24ab676SJeff Bonwick /*
228480901aeaSGeorge Wilson * XXX -- we should design a compression algorithm
228580901aeaSGeorge Wilson * that specializes in arrays of bps.
228680901aeaSGeorge Wilson */
2287db1741f5SJustin T. Gibbs compress = zio_compress_select(os->os_spa,
2288db1741f5SJustin T. Gibbs ZIO_COMPRESS_ON, ZIO_COMPRESS_ON);
228980901aeaSGeorge Wilson
229080901aeaSGeorge Wilson /*
2291b24ab676SJeff Bonwick * Metadata always gets checksummed. If the data
2292b24ab676SJeff Bonwick * checksum is multi-bit correctable, and it's not a
2293b24ab676SJeff Bonwick * ZBT-style checksum, then it's suitable for metadata
2294b24ab676SJeff Bonwick * as well. Otherwise, the metadata checksum defaults
2295b24ab676SJeff Bonwick * to fletcher4.
2296b24ab676SJeff Bonwick */
229745818ee1SMatthew Ahrens if (!(zio_checksum_table[checksum].ci_flags &
229845818ee1SMatthew Ahrens ZCHECKSUM_FLAG_METADATA) ||
229945818ee1SMatthew Ahrens (zio_checksum_table[checksum].ci_flags &
230045818ee1SMatthew Ahrens ZCHECKSUM_FLAG_EMBEDDED))
2301b24ab676SJeff Bonwick checksum = ZIO_CHECKSUM_FLETCHER_4;
2302edf345e6SMatthew Ahrens
2303edf345e6SMatthew Ahrens if (os->os_redundant_metadata == ZFS_REDUNDANT_METADATA_ALL ||
2304edf345e6SMatthew Ahrens (os->os_redundant_metadata ==
2305edf345e6SMatthew Ahrens ZFS_REDUNDANT_METADATA_MOST &&
2306edf345e6SMatthew Ahrens (level >= zfs_redundant_metadata_most_ditto_level ||
2307edf345e6SMatthew Ahrens DMU_OT_IS_METADATA(type) || (wp & WP_SPILL))))
2308edf345e6SMatthew Ahrens copies++;
230980901aeaSGeorge Wilson } else if (wp & WP_NOFILL) {
231080901aeaSGeorge Wilson ASSERT(level == 0);
2311b24ab676SJeff Bonwick
2312b24ab676SJeff Bonwick /*
231380901aeaSGeorge Wilson * If we're writing preallocated blocks, we aren't actually
231480901aeaSGeorge Wilson * writing them so don't set any policy properties. These
231580901aeaSGeorge Wilson * blocks are currently only used by an external subsystem
231680901aeaSGeorge Wilson * outside of zfs (i.e. dump) and not written by the zio
231780901aeaSGeorge Wilson * pipeline.
2318b24ab676SJeff Bonwick */
231980901aeaSGeorge Wilson compress = ZIO_COMPRESS_OFF;
2320810e43b2SBill Pijewski checksum = ZIO_CHECKSUM_NOPARITY;
2321b24ab676SJeff Bonwick } else {
2322db1741f5SJustin T. Gibbs compress = zio_compress_select(os->os_spa, dn->dn_compress,
2323db1741f5SJustin T. Gibbs compress);
232480901aeaSGeorge Wilson
232580901aeaSGeorge Wilson checksum = (dedup_checksum == ZIO_CHECKSUM_OFF) ?
232680901aeaSGeorge Wilson zio_checksum_select(dn->dn_checksum, checksum) :
232780901aeaSGeorge Wilson dedup_checksum;
232880901aeaSGeorge Wilson
232980901aeaSGeorge Wilson /*
233080901aeaSGeorge Wilson * Determine dedup setting. If we are in dmu_sync(),
233180901aeaSGeorge Wilson * we won't actually dedup now because that's all
233280901aeaSGeorge Wilson * done in syncing context; but we do want to use the
233380901aeaSGeorge Wilson * dedup checkum. If the checksum is not strong
233480901aeaSGeorge Wilson * enough to ensure unique signatures, force
233580901aeaSGeorge Wilson * dedup_verify.
233680901aeaSGeorge Wilson */
233780901aeaSGeorge Wilson if (dedup_checksum != ZIO_CHECKSUM_OFF) {
233880901aeaSGeorge Wilson dedup = (wp & WP_DMU_SYNC) ? B_FALSE : B_TRUE;
233945818ee1SMatthew Ahrens if (!(zio_checksum_table[checksum].ci_flags &
234045818ee1SMatthew Ahrens ZCHECKSUM_FLAG_DEDUP))
234180901aeaSGeorge Wilson dedup_verify = B_TRUE;
2342b24ab676SJeff Bonwick }
2343b24ab676SJeff Bonwick
2344b24ab676SJeff Bonwick /*
234545818ee1SMatthew Ahrens * Enable nopwrite if we have secure enough checksum
234645818ee1SMatthew Ahrens * algorithm (see comment in zio_nop_write) and
234745818ee1SMatthew Ahrens * compression is enabled. We don't enable nopwrite if
234845818ee1SMatthew Ahrens * dedup is enabled as the two features are mutually
234945818ee1SMatthew Ahrens * exclusive.
2350b24ab676SJeff Bonwick */
235145818ee1SMatthew Ahrens nopwrite = (!dedup && (zio_checksum_table[checksum].ci_flags &
235245818ee1SMatthew Ahrens ZCHECKSUM_FLAG_NOPWRITE) &&
235380901aeaSGeorge Wilson compress != ZIO_COMPRESS_OFF && zfs_nopwrite_enabled);
2354b24ab676SJeff Bonwick }
2355b24ab676SJeff Bonwick
2356eb633035STom Caputi /*
2357eb633035STom Caputi * All objects in an encrypted objset are protected from modification
2358eb633035STom Caputi * via a MAC. Encrypted objects store their IV and salt in the last DVA
2359eb633035STom Caputi * in the bp, so we cannot use all copies. Encrypted objects are also
2360eb633035STom Caputi * not subject to nopwrite since writing the same data will still
2361eb633035STom Caputi * result in a new ciphertext. Only encrypted blocks can be dedup'd
2362eb633035STom Caputi * to avoid ambiguity in the dedup code since the DDT does not store
2363eb633035STom Caputi * object types.
2364eb633035STom Caputi */
2365eb633035STom Caputi if (os->os_encrypted && (wp & WP_NOFILL) == 0) {
2366eb633035STom Caputi encrypt = B_TRUE;
23675602294fSDan Kimmel
2368eb633035STom Caputi if (DMU_OT_IS_ENCRYPTED(type)) {
2369eb633035STom Caputi copies = MIN(copies, SPA_DVAS_PER_BP - 1);
2370eb633035STom Caputi nopwrite = B_FALSE;
2371eb633035STom Caputi } else {
2372eb633035STom Caputi dedup = B_FALSE;
2373eb633035STom Caputi }
2374eb633035STom Caputi
2375eb633035STom Caputi if (level <= 0 &&
2376eb633035STom Caputi (type == DMU_OT_DNODE || type == DMU_OT_OBJSET)) {
2377eb633035STom Caputi compress = ZIO_COMPRESS_EMPTY;
2378eb633035STom Caputi }
2379eb633035STom Caputi }
2380eb633035STom Caputi
2381eb633035STom Caputi zp->zp_compress = compress;
2382eb633035STom Caputi zp->zp_checksum = checksum;
23830a586ceaSMark Shellenbaum zp->zp_type = (wp & WP_SPILL) ? dn->dn_bonustype : type;
2384b24ab676SJeff Bonwick zp->zp_level = level;
2385edf345e6SMatthew Ahrens zp->zp_copies = MIN(copies, spa_max_replication(os->os_spa));
2386b24ab676SJeff Bonwick zp->zp_dedup = dedup;
2387b24ab676SJeff Bonwick zp->zp_dedup_verify = dedup && dedup_verify;
238880901aeaSGeorge Wilson zp->zp_nopwrite = nopwrite;
2389663207adSDon Brady zp->zp_zpl_smallblk = DMU_OT_IS_FILE(zp->zp_type) ?
2390663207adSDon Brady os->os_zpl_special_smallblock : 0;
2391eb633035STom Caputi zp->zp_encrypt = encrypt;
2392eb633035STom Caputi zp->zp_byteorder = ZFS_HOST_BYTEORDER;
2393eb633035STom Caputi bzero(zp->zp_salt, ZIO_DATA_SALT_LEN);
2394eb633035STom Caputi bzero(zp->zp_iv, ZIO_DATA_IV_LEN);
2395eb633035STom Caputi bzero(zp->zp_mac, ZIO_DATA_MAC_LEN);
2396b24ab676SJeff Bonwick }
2397b24ab676SJeff Bonwick
239844cd46caSbillm int
dmu_offset_next(objset_t * os,uint64_t object,boolean_t hole,uint64_t * off)2399fa9e4066Sahrens dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, uint64_t *off)
2400fa9e4066Sahrens {
2401fa9e4066Sahrens dnode_t *dn;
24022bcf0248SMax Grossman int err;
2403fa9e4066Sahrens
2404fa9e4066Sahrens /*
2405fa9e4066Sahrens * Sync any current changes before
2406fa9e4066Sahrens * we go trundling through the block pointers.
2407fa9e4066Sahrens */
24082bcf0248SMax Grossman err = dmu_object_wait_synced(os, object);
24092bcf0248SMax Grossman if (err) {
24102bcf0248SMax Grossman return (err);
2411fa9e4066Sahrens }
24122bcf0248SMax Grossman
2413503ad85cSMatthew Ahrens err = dnode_hold(os, object, FTAG, &dn);
24142bcf0248SMax Grossman if (err) {
2415ea8dc4b6Seschrock return (err);
2416fa9e4066Sahrens }
2417fa9e4066Sahrens
2418cdb0ab79Smaybee err = dnode_next_offset(dn, (hole ? DNODE_FIND_HOLE : 0), off, 1, 1, 0);
2419fa9e4066Sahrens dnode_rele(dn, FTAG);
2420fa9e4066Sahrens
2421fa9e4066Sahrens return (err);
2422fa9e4066Sahrens }
2423fa9e4066Sahrens
24242bcf0248SMax Grossman /*
24252bcf0248SMax Grossman * Given the ZFS object, if it contains any dirty nodes
24262bcf0248SMax Grossman * this function flushes all dirty blocks to disk. This
24272bcf0248SMax Grossman * ensures the DMU object info is updated. A more efficient
24282bcf0248SMax Grossman * future version might just find the TXG with the maximum
24292bcf0248SMax Grossman * ID and wait for that to be synced.
24302bcf0248SMax Grossman */
24312bcf0248SMax Grossman int
dmu_object_wait_synced(objset_t * os,uint64_t object)24329a686fbcSPaul Dagnelie dmu_object_wait_synced(objset_t *os, uint64_t object)
24339a686fbcSPaul Dagnelie {
24342bcf0248SMax Grossman dnode_t *dn;
24352bcf0248SMax Grossman int error, i;
24362bcf0248SMax Grossman
24372bcf0248SMax Grossman error = dnode_hold(os, object, FTAG, &dn);
24382bcf0248SMax Grossman if (error) {
24392bcf0248SMax Grossman return (error);
24402bcf0248SMax Grossman }
24412bcf0248SMax Grossman
2442*2a6a1d83SRob Norris mutex_enter(&dn->dn_mtx);
24432bcf0248SMax Grossman for (i = 0; i < TXG_SIZE; i++) {
2444*2a6a1d83SRob Norris if (list_link_active(&dn->dn_dirty_link[i]) ||
2445*2a6a1d83SRob Norris !list_is_empty(&dn->dn_dirty_records[i])) {
24462bcf0248SMax Grossman break;
24472bcf0248SMax Grossman }
24482bcf0248SMax Grossman }
2449*2a6a1d83SRob Norris mutex_exit(&dn->dn_mtx);
2450*2a6a1d83SRob Norris
24512bcf0248SMax Grossman dnode_rele(dn, FTAG);
24522bcf0248SMax Grossman if (i != TXG_SIZE) {
24532bcf0248SMax Grossman txg_wait_synced(dmu_objset_pool(os), 0);
24542bcf0248SMax Grossman }
24552bcf0248SMax Grossman
24562bcf0248SMax Grossman return (0);
24572bcf0248SMax Grossman }
24582bcf0248SMax Grossman
2459fa9e4066Sahrens void
dmu_object_info_from_dnode(dnode_t * dn,dmu_object_info_t * doi)2460fa9e4066Sahrens dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi)
2461fa9e4066Sahrens {
2462b24ab676SJeff Bonwick dnode_phys_t *dnp;
2463b24ab676SJeff Bonwick
2464fa9e4066Sahrens rw_enter(&dn->dn_struct_rwlock, RW_READER);
2465fa9e4066Sahrens mutex_enter(&dn->dn_mtx);
2466fa9e4066Sahrens
2467b24ab676SJeff Bonwick dnp = dn->dn_phys;
2468b24ab676SJeff Bonwick
2469fa9e4066Sahrens doi->doi_data_block_size = dn->dn_datablksz;
2470fa9e4066Sahrens doi->doi_metadata_block_size = dn->dn_indblkshift ?
2471fa9e4066Sahrens 1ULL << dn->dn_indblkshift : 0;
2472b24ab676SJeff Bonwick doi->doi_type = dn->dn_type;
2473b24ab676SJeff Bonwick doi->doi_bonus_type = dn->dn_bonustype;
2474b24ab676SJeff Bonwick doi->doi_bonus_size = dn->dn_bonuslen;
247554811da5SToomas Soome doi->doi_dnodesize = dn->dn_num_slots << DNODE_SHIFT;
2476fa9e4066Sahrens doi->doi_indirection = dn->dn_nlevels;
2477fa9e4066Sahrens doi->doi_checksum = dn->dn_checksum;
2478fa9e4066Sahrens doi->doi_compress = dn->dn_compress;
2479e77d42eaSMatthew Ahrens doi->doi_nblkptr = dn->dn_nblkptr;
2480b24ab676SJeff Bonwick doi->doi_physical_blocks_512 = (DN_USED_BYTES(dnp) + 256) >> 9;
2481d0475637SMatthew Ahrens doi->doi_max_offset = (dn->dn_maxblkid + 1) * dn->dn_datablksz;
2482b24ab676SJeff Bonwick doi->doi_fill_count = 0;
2483b24ab676SJeff Bonwick for (int i = 0; i < dnp->dn_nblkptr; i++)
24845d7b4d43SMatthew Ahrens doi->doi_fill_count += BP_GET_FILL(&dnp->dn_blkptr[i]);
2485fa9e4066Sahrens
2486fa9e4066Sahrens mutex_exit(&dn->dn_mtx);
2487fa9e4066Sahrens rw_exit(&dn->dn_struct_rwlock);
2488fa9e4066Sahrens }
2489fa9e4066Sahrens
2490fa9e4066Sahrens /*
2491fa9e4066Sahrens * Get information on a DMU object.
2492fa9e4066Sahrens * If doi is NULL, just indicates whether the object exists.
2493fa9e4066Sahrens */
2494fa9e4066Sahrens int
dmu_object_info(objset_t * os,uint64_t object,dmu_object_info_t * doi)2495fa9e4066Sahrens dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi)
2496fa9e4066Sahrens {
2497ea8dc4b6Seschrock dnode_t *dn;
2498503ad85cSMatthew Ahrens int err = dnode_hold(os, object, FTAG, &dn);
2499fa9e4066Sahrens
2500ea8dc4b6Seschrock if (err)
2501ea8dc4b6Seschrock return (err);
2502fa9e4066Sahrens
2503fa9e4066Sahrens if (doi != NULL)
2504fa9e4066Sahrens dmu_object_info_from_dnode(dn, doi);
2505fa9e4066Sahrens
2506fa9e4066Sahrens dnode_rele(dn, FTAG);
2507fa9e4066Sahrens return (0);
2508fa9e4066Sahrens }
2509fa9e4066Sahrens
2510fa9e4066Sahrens /*
2511fa9e4066Sahrens * As above, but faster; can be used when you have a held dbuf in hand.
2512fa9e4066Sahrens */
2513fa9e4066Sahrens void
dmu_object_info_from_db(dmu_buf_t * db_fake,dmu_object_info_t * doi)2514744947dcSTom Erickson dmu_object_info_from_db(dmu_buf_t *db_fake, dmu_object_info_t *doi)
2515fa9e4066Sahrens {
2516744947dcSTom Erickson dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
2517744947dcSTom Erickson
2518744947dcSTom Erickson DB_DNODE_ENTER(db);
2519744947dcSTom Erickson dmu_object_info_from_dnode(DB_DNODE(db), doi);
2520744947dcSTom Erickson DB_DNODE_EXIT(db);
2521fa9e4066Sahrens }
2522fa9e4066Sahrens
2523fa9e4066Sahrens /*
2524fa9e4066Sahrens * Faster still when you only care about the size.
2525fa9e4066Sahrens * This is specifically optimized for zfs_getattr().
2526fa9e4066Sahrens */
2527fa9e4066Sahrens void
dmu_object_size_from_db(dmu_buf_t * db_fake,uint32_t * blksize,u_longlong_t * nblk512)2528744947dcSTom Erickson dmu_object_size_from_db(dmu_buf_t *db_fake, uint32_t *blksize,
2529744947dcSTom Erickson u_longlong_t *nblk512)
2530fa9e4066Sahrens {
2531744947dcSTom Erickson dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
2532744947dcSTom Erickson dnode_t *dn;
2533744947dcSTom Erickson
2534744947dcSTom Erickson DB_DNODE_ENTER(db);
2535744947dcSTom Erickson dn = DB_DNODE(db);
2536fa9e4066Sahrens
2537fa9e4066Sahrens *blksize = dn->dn_datablksz;
253854811da5SToomas Soome /* add in number of slots used for the dnode itself */
253999653d4eSeschrock *nblk512 = ((DN_USED_BYTES(dn->dn_phys) + SPA_MINBLOCKSIZE/2) >>
254054811da5SToomas Soome SPA_MINBLOCKSHIFT) + dn->dn_num_slots;
254154811da5SToomas Soome DB_DNODE_EXIT(db);
254254811da5SToomas Soome }
254354811da5SToomas Soome
254454811da5SToomas Soome void
dmu_object_dnsize_from_db(dmu_buf_t * db_fake,int * dnsize)254554811da5SToomas Soome dmu_object_dnsize_from_db(dmu_buf_t *db_fake, int *dnsize)
254654811da5SToomas Soome {
254754811da5SToomas Soome dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
254854811da5SToomas Soome dnode_t *dn;
254954811da5SToomas Soome
255054811da5SToomas Soome DB_DNODE_ENTER(db);
255154811da5SToomas Soome dn = DB_DNODE(db);
255254811da5SToomas Soome *dnsize = dn->dn_num_slots << DNODE_SHIFT;
2553744947dcSTom Erickson DB_DNODE_EXIT(db);
2554fa9e4066Sahrens }
2555fa9e4066Sahrens
2556fa9e4066Sahrens void
byteswap_uint64_array(void * vbuf,size_t size)2557fa9e4066Sahrens byteswap_uint64_array(void *vbuf, size_t size)
2558fa9e4066Sahrens {
2559fa9e4066Sahrens uint64_t *buf = vbuf;
2560fa9e4066Sahrens size_t count = size >> 3;
2561fa9e4066Sahrens int i;
2562fa9e4066Sahrens
2563fa9e4066Sahrens ASSERT((size & 7) == 0);
2564fa9e4066Sahrens
2565fa9e4066Sahrens for (i = 0; i < count; i++)
2566fa9e4066Sahrens buf[i] = BSWAP_64(buf[i]);
2567fa9e4066Sahrens }
2568fa9e4066Sahrens
2569fa9e4066Sahrens void
byteswap_uint32_array(void * vbuf,size_t size)2570fa9e4066Sahrens byteswap_uint32_array(void *vbuf, size_t size)
2571fa9e4066Sahrens {
2572fa9e4066Sahrens uint32_t *buf = vbuf;
2573fa9e4066Sahrens size_t count = size >> 2;
2574fa9e4066Sahrens int i;
2575fa9e4066Sahrens
2576fa9e4066Sahrens ASSERT((size & 3) == 0);
2577fa9e4066Sahrens
2578fa9e4066Sahrens for (i = 0; i < count; i++)
2579fa9e4066Sahrens buf[i] = BSWAP_32(buf[i]);
2580fa9e4066Sahrens }
2581fa9e4066Sahrens
2582fa9e4066Sahrens void
byteswap_uint16_array(void * vbuf,size_t size)2583fa9e4066Sahrens byteswap_uint16_array(void *vbuf, size_t size)
2584fa9e4066Sahrens {
2585fa9e4066Sahrens uint16_t *buf = vbuf;
2586fa9e4066Sahrens size_t count = size >> 1;
2587fa9e4066Sahrens int i;
2588fa9e4066Sahrens
2589fa9e4066Sahrens ASSERT((size & 1) == 0);
2590fa9e4066Sahrens
2591fa9e4066Sahrens for (i = 0; i < count; i++)
2592fa9e4066Sahrens buf[i] = BSWAP_16(buf[i]);
2593fa9e4066Sahrens }
2594fa9e4066Sahrens
2595fa9e4066Sahrens /* ARGSUSED */
2596fa9e4066Sahrens void
byteswap_uint8_array(void * vbuf,size_t size)2597fa9e4066Sahrens byteswap_uint8_array(void *vbuf, size_t size)
2598fa9e4066Sahrens {
2599fa9e4066Sahrens }
2600fa9e4066Sahrens
2601fa9e4066Sahrens void
dmu_init(void)2602fa9e4066Sahrens dmu_init(void)
2603fa9e4066Sahrens {
2604770499e1SDan Kimmel abd_init();
26053f9d6ad7SLin Ling zfs_dbgmsg_init();
2606744947dcSTom Erickson sa_cache_init();
2607744947dcSTom Erickson xuio_stat_init();
2608744947dcSTom Erickson dmu_objset_init();
2609fa9e4066Sahrens dnode_init();
26107cbf8b43SRich Morris zfetch_init();
2611fa94a07fSbrendan l2arc_init();
2612ce636f8bSMatthew Ahrens arc_init();
2613dcbf3bd6SGeorge Wilson dbuf_init();
2614fa9e4066Sahrens }
2615fa9e4066Sahrens
2616fa9e4066Sahrens void
dmu_fini(void)2617fa9e4066Sahrens dmu_fini(void)
2618fa9e4066Sahrens {
26193e30c24aSWill Andrews arc_fini(); /* arc depends on l2arc, so arc must go first */
2620ce636f8bSMatthew Ahrens l2arc_fini();
26217cbf8b43SRich Morris zfetch_fini();
2622fa9e4066Sahrens dbuf_fini();
2623744947dcSTom Erickson dnode_fini();
2624744947dcSTom Erickson dmu_objset_fini();
2625c242f9a0Schunli zhang - Sun Microsystems - Irvine United States xuio_stat_fini();
26260a586ceaSMark Shellenbaum sa_cache_fini();
26273f9d6ad7SLin Ling zfs_dbgmsg_fini();
2628770499e1SDan Kimmel abd_fini();
2629fa9e4066Sahrens }
2630