xref: /onnv-gate/usr/src/uts/common/fs/zfs/dmu.c (revision 12684:397e44ebb8a9)
1789Sahrens /*
2789Sahrens  * CDDL HEADER START
3789Sahrens  *
4789Sahrens  * The contents of this file are subject to the terms of the
51544Seschrock  * Common Development and Distribution License (the "License").
61544Seschrock  * You may not use this file except in compliance with the License.
7789Sahrens  *
8789Sahrens  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9789Sahrens  * or http://www.opensolaris.org/os/licensing.
10789Sahrens  * See the License for the specific language governing permissions
11789Sahrens  * and limitations under the License.
12789Sahrens  *
13789Sahrens  * When distributing Covered Code, include this CDDL HEADER in each
14789Sahrens  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15789Sahrens  * If applicable, add the following below this CDDL HEADER, with the
16789Sahrens  * fields enclosed by brackets "[]" replaced with your own identifying
17789Sahrens  * information: Portions Copyright [yyyy] [name of copyright owner]
18789Sahrens  *
19789Sahrens  * CDDL HEADER END
20789Sahrens  */
21789Sahrens /*
2212123STim.Haley@Sun.COM  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23789Sahrens  */
24789Sahrens 
25789Sahrens #include <sys/dmu.h>
26789Sahrens #include <sys/dmu_impl.h>
27789Sahrens #include <sys/dmu_tx.h>
28789Sahrens #include <sys/dbuf.h>
29789Sahrens #include <sys/dnode.h>
30789Sahrens #include <sys/zfs_context.h>
31789Sahrens #include <sys/dmu_objset.h>
32789Sahrens #include <sys/dmu_traverse.h>
33789Sahrens #include <sys/dsl_dataset.h>
34789Sahrens #include <sys/dsl_dir.h>
35789Sahrens #include <sys/dsl_pool.h>
362199Sahrens #include <sys/dsl_synctask.h>
372885Sahrens #include <sys/dsl_prop.h>
38789Sahrens #include <sys/dmu_zfetch.h>
39789Sahrens #include <sys/zfs_ioctl.h>
40789Sahrens #include <sys/zap.h>
411544Seschrock #include <sys/zio_checksum.h>
4211935SMark.Shellenbaum@Sun.COM #include <sys/sa.h>
432688Smaybee #ifdef _KERNEL
442688Smaybee #include <sys/vmsystm.h>
457315SJonathan.Adams@Sun.COM #include <sys/zfs_znode.h>
462688Smaybee #endif
47789Sahrens 
48789Sahrens const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES] = {
49789Sahrens 	{	byteswap_uint8_array,	TRUE,	"unallocated"		},
50789Sahrens 	{	zap_byteswap,		TRUE,	"object directory"	},
51789Sahrens 	{	byteswap_uint64_array,	TRUE,	"object array"		},
52789Sahrens 	{	byteswap_uint8_array,	TRUE,	"packed nvlist"		},
53789Sahrens 	{	byteswap_uint64_array,	TRUE,	"packed nvlist size"	},
5412470SMatthew.Ahrens@Sun.COM 	{	byteswap_uint64_array,	TRUE,	"bpobj"			},
5512470SMatthew.Ahrens@Sun.COM 	{	byteswap_uint64_array,	TRUE,	"bpobj header"		},
56789Sahrens 	{	byteswap_uint64_array,	TRUE,	"SPA space map header"	},
57789Sahrens 	{	byteswap_uint64_array,	TRUE,	"SPA space map"		},
58789Sahrens 	{	byteswap_uint64_array,	TRUE,	"ZIL intent log"	},
59789Sahrens 	{	dnode_buf_byteswap,	TRUE,	"DMU dnode"		},
60789Sahrens 	{	dmu_objset_byteswap,	TRUE,	"DMU objset"		},
61789Sahrens 	{	byteswap_uint64_array,	TRUE,	"DSL directory"		},
62789Sahrens 	{	zap_byteswap,		TRUE,	"DSL directory child map"},
63789Sahrens 	{	zap_byteswap,		TRUE,	"DSL dataset snap map"	},
64789Sahrens 	{	zap_byteswap,		TRUE,	"DSL props"		},
65789Sahrens 	{	byteswap_uint64_array,	TRUE,	"DSL dataset"		},
66789Sahrens 	{	zfs_znode_byteswap,	TRUE,	"ZFS znode"		},
675331Samw 	{	zfs_oldacl_byteswap,	TRUE,	"ZFS V0 ACL"		},
68789Sahrens 	{	byteswap_uint8_array,	FALSE,	"ZFS plain file"	},
69789Sahrens 	{	zap_byteswap,		TRUE,	"ZFS directory"		},
70789Sahrens 	{	zap_byteswap,		TRUE,	"ZFS master node"	},
71789Sahrens 	{	zap_byteswap,		TRUE,	"ZFS delete queue"	},
72789Sahrens 	{	byteswap_uint8_array,	FALSE,	"zvol object"		},
73789Sahrens 	{	zap_byteswap,		TRUE,	"zvol prop"		},
74789Sahrens 	{	byteswap_uint8_array,	FALSE,	"other uint8[]"		},
75789Sahrens 	{	byteswap_uint64_array,	FALSE,	"other uint64[]"	},
76789Sahrens 	{	zap_byteswap,		TRUE,	"other ZAP"		},
771544Seschrock 	{	zap_byteswap,		TRUE,	"persistent error log"	},
782926Sek110237 	{	byteswap_uint8_array,	TRUE,	"SPA history"		},
792926Sek110237 	{	byteswap_uint64_array,	TRUE,	"SPA history offsets"	},
804543Smarks 	{	zap_byteswap,		TRUE,	"Pool properties"	},
815331Samw 	{	zap_byteswap,		TRUE,	"DSL permissions"	},
825331Samw 	{	zfs_acl_byteswap,	TRUE,	"ZFS ACL"		},
835331Samw 	{	byteswap_uint8_array,	TRUE,	"ZFS SYSACL"		},
845331Samw 	{	byteswap_uint8_array,	TRUE,	"FUID table"		},
855339Smarks 	{	byteswap_uint64_array,	TRUE,	"FUID table size"	},
867046Sahrens 	{	zap_byteswap,		TRUE,	"DSL dataset next clones"},
8712296SLin.Ling@Sun.COM 	{	zap_byteswap,		TRUE,	"scan work queue"	},
889396SMatthew.Ahrens@Sun.COM 	{	zap_byteswap,		TRUE,	"ZFS user/group used"	},
899396SMatthew.Ahrens@Sun.COM 	{	zap_byteswap,		TRUE,	"ZFS user/group quota"	},
9010242Schris.kirby@sun.com 	{	zap_byteswap,		TRUE,	"snapshot refcount tags"},
9110922SJeff.Bonwick@Sun.COM 	{	zap_byteswap,		TRUE,	"DDT ZAP algorithm"	},
9210922SJeff.Bonwick@Sun.COM 	{	zap_byteswap,		TRUE,	"DDT statistics"	},
9311935SMark.Shellenbaum@Sun.COM 	{	byteswap_uint8_array,	TRUE,	"System attributes"	},
9411935SMark.Shellenbaum@Sun.COM 	{	zap_byteswap,		TRUE,	"SA master node"	},
9511935SMark.Shellenbaum@Sun.COM 	{	zap_byteswap,		TRUE,	"SA attr registration"	},
9612296SLin.Ling@Sun.COM 	{	zap_byteswap,		TRUE,	"SA attr layouts"	},
9712296SLin.Ling@Sun.COM 	{	zap_byteswap,		TRUE,	"scan translations"	},
9812296SLin.Ling@Sun.COM 	{	byteswap_uint8_array,	FALSE,	"deduplicated block"	},
9912470SMatthew.Ahrens@Sun.COM 	{	zap_byteswap,		TRUE,	"DSL deadlist map"	},
10012470SMatthew.Ahrens@Sun.COM 	{	byteswap_uint64_array,	TRUE,	"DSL deadlist map hdr"	},
10112470SMatthew.Ahrens@Sun.COM 	{	zap_byteswap,		TRUE,	"DSL dir clones"	},
10212470SMatthew.Ahrens@Sun.COM 	{	byteswap_uint64_array,	TRUE,	"bpobj subobj"		},
10312296SLin.Ling@Sun.COM };
104789Sahrens 
105789Sahrens int
dmu_buf_hold(objset_t * os,uint64_t object,uint64_t offset,void * tag,dmu_buf_t ** dbp,int flags)1061544Seschrock dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset,
10712285SJeff.Bonwick@Sun.COM     void *tag, dmu_buf_t **dbp, int flags)
108789Sahrens {
109789Sahrens 	dnode_t *dn;
110789Sahrens 	uint64_t blkid;
111789Sahrens 	dmu_buf_impl_t *db;
1121544Seschrock 	int err;
11312285SJeff.Bonwick@Sun.COM 	int db_flags = DB_RF_CANFAIL;
11412285SJeff.Bonwick@Sun.COM 
11512285SJeff.Bonwick@Sun.COM 	if (flags & DMU_READ_NO_PREFETCH)
11612285SJeff.Bonwick@Sun.COM 		db_flags |= DB_RF_NOPREFETCH;
117789Sahrens 
11810298SMatthew.Ahrens@Sun.COM 	err = dnode_hold(os, object, FTAG, &dn);
1191544Seschrock 	if (err)
1201544Seschrock 		return (err);
121789Sahrens 	blkid = dbuf_whichblock(dn, offset);
122789Sahrens 	rw_enter(&dn->dn_struct_rwlock, RW_READER);
1231544Seschrock 	db = dbuf_hold(dn, blkid, tag);
124789Sahrens 	rw_exit(&dn->dn_struct_rwlock);
1251544Seschrock 	if (db == NULL) {
1261544Seschrock 		err = EIO;
1271544Seschrock 	} else {
12812285SJeff.Bonwick@Sun.COM 		err = dbuf_read(db, NULL, db_flags);
1291544Seschrock 		if (err) {
1301544Seschrock 			dbuf_rele(db, tag);
1311544Seschrock 			db = NULL;
1321544Seschrock 		}
1331544Seschrock 	}
1341544Seschrock 
135789Sahrens 	dnode_rele(dn, FTAG);
136*12684STom.Erickson@Sun.COM 	*dbp = &db->db; /* NULL db plus first field offset is NULL */
1371544Seschrock 	return (err);
138789Sahrens }
139789Sahrens 
140789Sahrens int
dmu_bonus_max(void)141789Sahrens dmu_bonus_max(void)
142789Sahrens {
143789Sahrens 	return (DN_MAX_BONUSLEN);
144789Sahrens }
145789Sahrens 
1464944Smaybee int
dmu_set_bonus(dmu_buf_t * db_fake,int newsize,dmu_tx_t * tx)147*12684STom.Erickson@Sun.COM dmu_set_bonus(dmu_buf_t *db_fake, int newsize, dmu_tx_t *tx)
1484944Smaybee {
149*12684STom.Erickson@Sun.COM 	dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
150*12684STom.Erickson@Sun.COM 	dnode_t *dn;
151*12684STom.Erickson@Sun.COM 	int error;
152*12684STom.Erickson@Sun.COM 
153*12684STom.Erickson@Sun.COM 	DB_DNODE_ENTER(db);
154*12684STom.Erickson@Sun.COM 	dn = DB_DNODE(db);
1554944Smaybee 
156*12684STom.Erickson@Sun.COM 	if (dn->dn_bonus != db) {
157*12684STom.Erickson@Sun.COM 		error = EINVAL;
158*12684STom.Erickson@Sun.COM 	} else if (newsize < 0 || newsize > db_fake->db_size) {
159*12684STom.Erickson@Sun.COM 		error = EINVAL;
160*12684STom.Erickson@Sun.COM 	} else {
161*12684STom.Erickson@Sun.COM 		dnode_setbonuslen(dn, newsize, tx);
162*12684STom.Erickson@Sun.COM 		error = 0;
163*12684STom.Erickson@Sun.COM 	}
164*12684STom.Erickson@Sun.COM 
165*12684STom.Erickson@Sun.COM 	DB_DNODE_EXIT(db);
166*12684STom.Erickson@Sun.COM 	return (error);
1674944Smaybee }
1684944Smaybee 
16911935SMark.Shellenbaum@Sun.COM int
dmu_set_bonustype(dmu_buf_t * db_fake,dmu_object_type_t type,dmu_tx_t * tx)170*12684STom.Erickson@Sun.COM dmu_set_bonustype(dmu_buf_t *db_fake, dmu_object_type_t type, dmu_tx_t *tx)
17111935SMark.Shellenbaum@Sun.COM {
172*12684STom.Erickson@Sun.COM 	dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
173*12684STom.Erickson@Sun.COM 	dnode_t *dn;
174*12684STom.Erickson@Sun.COM 	int error;
175*12684STom.Erickson@Sun.COM 
176*12684STom.Erickson@Sun.COM 	DB_DNODE_ENTER(db);
177*12684STom.Erickson@Sun.COM 	dn = DB_DNODE(db);
178*12684STom.Erickson@Sun.COM 
179*12684STom.Erickson@Sun.COM 	if (type > DMU_OT_NUMTYPES) {
180*12684STom.Erickson@Sun.COM 		error = EINVAL;
181*12684STom.Erickson@Sun.COM 	} else if (dn->dn_bonus != db) {
182*12684STom.Erickson@Sun.COM 		error = EINVAL;
183*12684STom.Erickson@Sun.COM 	} else {
184*12684STom.Erickson@Sun.COM 		dnode_setbonus_type(dn, type, tx);
185*12684STom.Erickson@Sun.COM 		error = 0;
186*12684STom.Erickson@Sun.COM 	}
18711935SMark.Shellenbaum@Sun.COM 
188*12684STom.Erickson@Sun.COM 	DB_DNODE_EXIT(db);
189*12684STom.Erickson@Sun.COM 	return (error);
190*12684STom.Erickson@Sun.COM }
19111935SMark.Shellenbaum@Sun.COM 
192*12684STom.Erickson@Sun.COM dmu_object_type_t
dmu_get_bonustype(dmu_buf_t * db_fake)193*12684STom.Erickson@Sun.COM dmu_get_bonustype(dmu_buf_t *db_fake)
194*12684STom.Erickson@Sun.COM {
195*12684STom.Erickson@Sun.COM 	dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
196*12684STom.Erickson@Sun.COM 	dnode_t *dn;
197*12684STom.Erickson@Sun.COM 	dmu_object_type_t type;
19811935SMark.Shellenbaum@Sun.COM 
199*12684STom.Erickson@Sun.COM 	DB_DNODE_ENTER(db);
200*12684STom.Erickson@Sun.COM 	dn = DB_DNODE(db);
201*12684STom.Erickson@Sun.COM 	type = dn->dn_bonustype;
202*12684STom.Erickson@Sun.COM 	DB_DNODE_EXIT(db);
203*12684STom.Erickson@Sun.COM 
204*12684STom.Erickson@Sun.COM 	return (type);
20511935SMark.Shellenbaum@Sun.COM }
20611935SMark.Shellenbaum@Sun.COM 
20711935SMark.Shellenbaum@Sun.COM int
dmu_rm_spill(objset_t * os,uint64_t object,dmu_tx_t * tx)20811935SMark.Shellenbaum@Sun.COM dmu_rm_spill(objset_t *os, uint64_t object, dmu_tx_t *tx)
20911935SMark.Shellenbaum@Sun.COM {
21011935SMark.Shellenbaum@Sun.COM 	dnode_t *dn;
21111935SMark.Shellenbaum@Sun.COM 	int error;
21211935SMark.Shellenbaum@Sun.COM 
21311935SMark.Shellenbaum@Sun.COM 	error = dnode_hold(os, object, FTAG, &dn);
21411935SMark.Shellenbaum@Sun.COM 	dbuf_rm_spill(dn, tx);
21512178SMark.Shellenbaum@Sun.COM 	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
21612178SMark.Shellenbaum@Sun.COM 	dnode_rm_spill(dn, tx);
21712178SMark.Shellenbaum@Sun.COM 	rw_exit(&dn->dn_struct_rwlock);
21811935SMark.Shellenbaum@Sun.COM 	dnode_rele(dn, FTAG);
21911935SMark.Shellenbaum@Sun.COM 	return (error);
22011935SMark.Shellenbaum@Sun.COM }
22111935SMark.Shellenbaum@Sun.COM 
222789Sahrens /*
2231544Seschrock  * returns ENOENT, EIO, or 0.
224789Sahrens  */
2251544Seschrock int
dmu_bonus_hold(objset_t * os,uint64_t object,void * tag,dmu_buf_t ** dbp)2261544Seschrock dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **dbp)
227789Sahrens {
2281544Seschrock 	dnode_t *dn;
229789Sahrens 	dmu_buf_impl_t *db;
2304944Smaybee 	int error;
231789Sahrens 
23210298SMatthew.Ahrens@Sun.COM 	error = dnode_hold(os, object, FTAG, &dn);
2334944Smaybee 	if (error)
2344944Smaybee 		return (error);
235789Sahrens 
2361544Seschrock 	rw_enter(&dn->dn_struct_rwlock, RW_READER);
2371544Seschrock 	if (dn->dn_bonus == NULL) {
238789Sahrens 		rw_exit(&dn->dn_struct_rwlock);
2391544Seschrock 		rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
2401544Seschrock 		if (dn->dn_bonus == NULL)
2414944Smaybee 			dbuf_create_bonus(dn);
242789Sahrens 	}
2431544Seschrock 	db = dn->dn_bonus;
2444944Smaybee 
2454944Smaybee 	/* as long as the bonus buf is held, the dnode will be held */
246*12684STom.Erickson@Sun.COM 	if (refcount_add(&db->db_holds, tag) == 1) {
2474944Smaybee 		VERIFY(dnode_add_ref(dn, db));
248*12684STom.Erickson@Sun.COM 		(void) atomic_inc_32_nv(&dn->dn_dbufs_count);
249*12684STom.Erickson@Sun.COM 	}
250*12684STom.Erickson@Sun.COM 
251*12684STom.Erickson@Sun.COM 	/*
252*12684STom.Erickson@Sun.COM 	 * Wait to drop dn_struct_rwlock until after adding the bonus dbuf's
253*12684STom.Erickson@Sun.COM 	 * hold and incrementing the dbuf count to ensure that dnode_move() sees
254*12684STom.Erickson@Sun.COM 	 * a dnode hold for every dbuf.
255*12684STom.Erickson@Sun.COM 	 */
256*12684STom.Erickson@Sun.COM 	rw_exit(&dn->dn_struct_rwlock);
2574944Smaybee 
258789Sahrens 	dnode_rele(dn, FTAG);
2591544Seschrock 
26012285SJeff.Bonwick@Sun.COM 	VERIFY(0 == dbuf_read(db, NULL, DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH));
2611544Seschrock 
2621544Seschrock 	*dbp = &db->db;
2631544Seschrock 	return (0);
264789Sahrens }
265789Sahrens 
2662391Smaybee /*
26711935SMark.Shellenbaum@Sun.COM  * returns ENOENT, EIO, or 0.
26811935SMark.Shellenbaum@Sun.COM  *
26911935SMark.Shellenbaum@Sun.COM  * This interface will allocate a blank spill dbuf when a spill blk
27011935SMark.Shellenbaum@Sun.COM  * doesn't already exist on the dnode.
27111935SMark.Shellenbaum@Sun.COM  *
27211935SMark.Shellenbaum@Sun.COM  * if you only want to find an already existing spill db, then
27311935SMark.Shellenbaum@Sun.COM  * dmu_spill_hold_existing() should be used.
27411935SMark.Shellenbaum@Sun.COM  */
27511935SMark.Shellenbaum@Sun.COM int
dmu_spill_hold_by_dnode(dnode_t * dn,uint32_t flags,void * tag,dmu_buf_t ** dbp)27611935SMark.Shellenbaum@Sun.COM dmu_spill_hold_by_dnode(dnode_t *dn, uint32_t flags, void *tag, dmu_buf_t **dbp)
27711935SMark.Shellenbaum@Sun.COM {
27811935SMark.Shellenbaum@Sun.COM 	dmu_buf_impl_t *db = NULL;
27911935SMark.Shellenbaum@Sun.COM 	int err;
28011935SMark.Shellenbaum@Sun.COM 
28111935SMark.Shellenbaum@Sun.COM 	if ((flags & DB_RF_HAVESTRUCT) == 0)
28211935SMark.Shellenbaum@Sun.COM 		rw_enter(&dn->dn_struct_rwlock, RW_READER);
28311935SMark.Shellenbaum@Sun.COM 
28411935SMark.Shellenbaum@Sun.COM 	db = dbuf_hold(dn, DMU_SPILL_BLKID, tag);
28511935SMark.Shellenbaum@Sun.COM 
28611935SMark.Shellenbaum@Sun.COM 	if ((flags & DB_RF_HAVESTRUCT) == 0)
28711935SMark.Shellenbaum@Sun.COM 		rw_exit(&dn->dn_struct_rwlock);
28811935SMark.Shellenbaum@Sun.COM 
28911935SMark.Shellenbaum@Sun.COM 	ASSERT(db != NULL);
29012493SMark.Shellenbaum@Oracle.COM 	err = dbuf_read(db, NULL, flags);
29112493SMark.Shellenbaum@Oracle.COM 	if (err == 0)
29212493SMark.Shellenbaum@Oracle.COM 		*dbp = &db->db;
29312493SMark.Shellenbaum@Oracle.COM 	else
29412493SMark.Shellenbaum@Oracle.COM 		dbuf_rele(db, tag);
29511935SMark.Shellenbaum@Sun.COM 	return (err);
29611935SMark.Shellenbaum@Sun.COM }
29711935SMark.Shellenbaum@Sun.COM 
29811935SMark.Shellenbaum@Sun.COM int
dmu_spill_hold_existing(dmu_buf_t * bonus,void * tag,dmu_buf_t ** dbp)29911935SMark.Shellenbaum@Sun.COM dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp)
30011935SMark.Shellenbaum@Sun.COM {
301*12684STom.Erickson@Sun.COM 	dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus;
302*12684STom.Erickson@Sun.COM 	dnode_t *dn;
30311935SMark.Shellenbaum@Sun.COM 	int err;
30411935SMark.Shellenbaum@Sun.COM 
305*12684STom.Erickson@Sun.COM 	DB_DNODE_ENTER(db);
306*12684STom.Erickson@Sun.COM 	dn = DB_DNODE(db);
307*12684STom.Erickson@Sun.COM 
308*12684STom.Erickson@Sun.COM 	if (spa_version(dn->dn_objset->os_spa) < SPA_VERSION_SA) {
309*12684STom.Erickson@Sun.COM 		err = EINVAL;
310*12684STom.Erickson@Sun.COM 	} else {
311*12684STom.Erickson@Sun.COM 		rw_enter(&dn->dn_struct_rwlock, RW_READER);
31211935SMark.Shellenbaum@Sun.COM 
313*12684STom.Erickson@Sun.COM 		if (!dn->dn_have_spill) {
314*12684STom.Erickson@Sun.COM 			err = ENOENT;
315*12684STom.Erickson@Sun.COM 		} else {
316*12684STom.Erickson@Sun.COM 			err = dmu_spill_hold_by_dnode(dn,
317*12684STom.Erickson@Sun.COM 			    DB_RF_HAVESTRUCT | DB_RF_CANFAIL, tag, dbp);
318*12684STom.Erickson@Sun.COM 		}
319*12684STom.Erickson@Sun.COM 
32011935SMark.Shellenbaum@Sun.COM 		rw_exit(&dn->dn_struct_rwlock);
32111935SMark.Shellenbaum@Sun.COM 	}
322*12684STom.Erickson@Sun.COM 
323*12684STom.Erickson@Sun.COM 	DB_DNODE_EXIT(db);
32411935SMark.Shellenbaum@Sun.COM 	return (err);
32511935SMark.Shellenbaum@Sun.COM }
32611935SMark.Shellenbaum@Sun.COM 
32711935SMark.Shellenbaum@Sun.COM int
dmu_spill_hold_by_bonus(dmu_buf_t * bonus,void * tag,dmu_buf_t ** dbp)32811935SMark.Shellenbaum@Sun.COM dmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp)
32911935SMark.Shellenbaum@Sun.COM {
330*12684STom.Erickson@Sun.COM 	dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus;
331*12684STom.Erickson@Sun.COM 	dnode_t *dn;
332*12684STom.Erickson@Sun.COM 	int err;
333*12684STom.Erickson@Sun.COM 
334*12684STom.Erickson@Sun.COM 	DB_DNODE_ENTER(db);
335*12684STom.Erickson@Sun.COM 	dn = DB_DNODE(db);
336*12684STom.Erickson@Sun.COM 	err = dmu_spill_hold_by_dnode(dn, DB_RF_CANFAIL, tag, dbp);
337*12684STom.Erickson@Sun.COM 	DB_DNODE_EXIT(db);
338*12684STom.Erickson@Sun.COM 
339*12684STom.Erickson@Sun.COM 	return (err);
34011935SMark.Shellenbaum@Sun.COM }
34111935SMark.Shellenbaum@Sun.COM 
34211935SMark.Shellenbaum@Sun.COM /*
3432391Smaybee  * Note: longer-term, we should modify all of the dmu_buf_*() interfaces
3442391Smaybee  * to take a held dnode rather than <os, object> -- the lookup is wasteful,
3452391Smaybee  * and can induce severe lock contention when writing to several files
3462391Smaybee  * whose dnodes are in the same block.
3472391Smaybee  */
3482391Smaybee static int
dmu_buf_hold_array_by_dnode(dnode_t * dn,uint64_t offset,uint64_t length,int read,void * tag,int * numbufsp,dmu_buf_t *** dbpp,uint32_t flags)3499512SNeil.Perrin@Sun.COM dmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset, uint64_t length,
3509512SNeil.Perrin@Sun.COM     int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp, uint32_t flags)
351789Sahrens {
3527468SMark.Maybee@Sun.COM 	dsl_pool_t *dp = NULL;
353789Sahrens 	dmu_buf_t **dbp;
354789Sahrens 	uint64_t blkid, nblks, i;
3559512SNeil.Perrin@Sun.COM 	uint32_t dbuf_flags;
3561544Seschrock 	int err;
3571544Seschrock 	zio_t *zio;
3587468SMark.Maybee@Sun.COM 	hrtime_t start;
3591544Seschrock 
3601544Seschrock 	ASSERT(length <= DMU_MAX_ACCESS);
361789Sahrens 
36210209SMark.Musante@Sun.COM 	dbuf_flags = DB_RF_CANFAIL | DB_RF_NEVERWAIT | DB_RF_HAVESTRUCT;
3639512SNeil.Perrin@Sun.COM 	if (flags & DMU_READ_NO_PREFETCH || length > zfetch_array_rd_sz)
3649512SNeil.Perrin@Sun.COM 		dbuf_flags |= DB_RF_NOPREFETCH;
3651544Seschrock 
366789Sahrens 	rw_enter(&dn->dn_struct_rwlock, RW_READER);
367789Sahrens 	if (dn->dn_datablkshift) {
368789Sahrens 		int blkshift = dn->dn_datablkshift;
369789Sahrens 		nblks = (P2ROUNDUP(offset+length, 1ULL<<blkshift) -
3703912Slling 		    P2ALIGN(offset, 1ULL<<blkshift)) >> blkshift;
371789Sahrens 	} else {
3723713Sahrens 		if (offset + length > dn->dn_datablksz) {
3733713Sahrens 			zfs_panic_recover("zfs: accessing past end of object "
3743713Sahrens 			    "%llx/%llx (size=%u access=%llu+%llu)",
3753713Sahrens 			    (longlong_t)dn->dn_objset->
3763713Sahrens 			    os_dsl_dataset->ds_object,
3773713Sahrens 			    (longlong_t)dn->dn_object, dn->dn_datablksz,
3783713Sahrens 			    (longlong_t)offset, (longlong_t)length);
37910209SMark.Musante@Sun.COM 			rw_exit(&dn->dn_struct_rwlock);
3803713Sahrens 			return (EIO);
3813713Sahrens 		}
382789Sahrens 		nblks = 1;
383789Sahrens 	}
3841544Seschrock 	dbp = kmem_zalloc(sizeof (dmu_buf_t *) * nblks, KM_SLEEP);
385789Sahrens 
3867468SMark.Maybee@Sun.COM 	if (dn->dn_objset->os_dsl_dataset)
3877468SMark.Maybee@Sun.COM 		dp = dn->dn_objset->os_dsl_dataset->ds_dir->dd_pool;
3887468SMark.Maybee@Sun.COM 	if (dp && dsl_pool_sync_context(dp))
3897468SMark.Maybee@Sun.COM 		start = gethrtime();
3907754SJeff.Bonwick@Sun.COM 	zio = zio_root(dn->dn_objset->os_spa, NULL, NULL, ZIO_FLAG_CANFAIL);
391789Sahrens 	blkid = dbuf_whichblock(dn, offset);
392789Sahrens 	for (i = 0; i < nblks; i++) {
3931544Seschrock 		dmu_buf_impl_t *db = dbuf_hold(dn, blkid+i, tag);
3941544Seschrock 		if (db == NULL) {
3951544Seschrock 			rw_exit(&dn->dn_struct_rwlock);
3961544Seschrock 			dmu_buf_rele_array(dbp, nblks, tag);
3971544Seschrock 			zio_nowait(zio);
3981544Seschrock 			return (EIO);
3991544Seschrock 		}
4001544Seschrock 		/* initiate async i/o */
4012391Smaybee 		if (read) {
4029512SNeil.Perrin@Sun.COM 			(void) dbuf_read(db, zio, dbuf_flags);
4031544Seschrock 		}
4041544Seschrock 		dbp[i] = &db->db;
405789Sahrens 	}
406789Sahrens 	rw_exit(&dn->dn_struct_rwlock);
407789Sahrens 
4081544Seschrock 	/* wait for async i/o */
4091544Seschrock 	err = zio_wait(zio);
4107468SMark.Maybee@Sun.COM 	/* track read overhead when we are in sync context */
4117468SMark.Maybee@Sun.COM 	if (dp && dsl_pool_sync_context(dp))
4127468SMark.Maybee@Sun.COM 		dp->dp_read_overhead += gethrtime() - start;
4131544Seschrock 	if (err) {
4141544Seschrock 		dmu_buf_rele_array(dbp, nblks, tag);
4151544Seschrock 		return (err);
416789Sahrens 	}
417789Sahrens 
4181544Seschrock 	/* wait for other io to complete */
4191544Seschrock 	if (read) {
4201544Seschrock 		for (i = 0; i < nblks; i++) {
4211544Seschrock 			dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbp[i];
4221544Seschrock 			mutex_enter(&db->db_mtx);
4231544Seschrock 			while (db->db_state == DB_READ ||
4241544Seschrock 			    db->db_state == DB_FILL)
4251544Seschrock 				cv_wait(&db->db_changed, &db->db_mtx);
4261544Seschrock 			if (db->db_state == DB_UNCACHED)
4271544Seschrock 				err = EIO;
4281544Seschrock 			mutex_exit(&db->db_mtx);
4291544Seschrock 			if (err) {
4301544Seschrock 				dmu_buf_rele_array(dbp, nblks, tag);
4311544Seschrock 				return (err);
4321544Seschrock 			}
4331544Seschrock 		}
4341544Seschrock 	}
435789Sahrens 
4361544Seschrock 	*numbufsp = nblks;
4371544Seschrock 	*dbpp = dbp;
4381544Seschrock 	return (0);
439789Sahrens }
440789Sahrens 
4412885Sahrens 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)4422391Smaybee dmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset,
4432391Smaybee     uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp)
4442391Smaybee {
4452391Smaybee 	dnode_t *dn;
4462391Smaybee 	int err;
4472391Smaybee 
44810298SMatthew.Ahrens@Sun.COM 	err = dnode_hold(os, object, FTAG, &dn);
4492391Smaybee 	if (err)
4502391Smaybee 		return (err);
4512391Smaybee 
4522391Smaybee 	err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag,
4539512SNeil.Perrin@Sun.COM 	    numbufsp, dbpp, DMU_READ_PREFETCH);
4542391Smaybee 
4552391Smaybee 	dnode_rele(dn, FTAG);
4562391Smaybee 
4572391Smaybee 	return (err);
4582391Smaybee }
4592391Smaybee 
4602391Smaybee int
dmu_buf_hold_array_by_bonus(dmu_buf_t * db_fake,uint64_t offset,uint64_t length,int read,void * tag,int * numbufsp,dmu_buf_t *** dbpp)461*12684STom.Erickson@Sun.COM dmu_buf_hold_array_by_bonus(dmu_buf_t *db_fake, uint64_t offset,
4622391Smaybee     uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp)
4632391Smaybee {
464*12684STom.Erickson@Sun.COM 	dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
465*12684STom.Erickson@Sun.COM 	dnode_t *dn;
4662391Smaybee 	int err;
4672391Smaybee 
468*12684STom.Erickson@Sun.COM 	DB_DNODE_ENTER(db);
469*12684STom.Erickson@Sun.COM 	dn = DB_DNODE(db);
4702391Smaybee 	err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag,
4719512SNeil.Perrin@Sun.COM 	    numbufsp, dbpp, DMU_READ_PREFETCH);
472*12684STom.Erickson@Sun.COM 	DB_DNODE_EXIT(db);
4732391Smaybee 
4742391Smaybee 	return (err);
4752391Smaybee }
4762391Smaybee 
477789Sahrens void
dmu_buf_rele_array(dmu_buf_t ** dbp_fake,int numbufs,void * tag)4781544Seschrock dmu_buf_rele_array(dmu_buf_t **dbp_fake, int numbufs, void *tag)
479789Sahrens {
480789Sahrens 	int i;
481789Sahrens 	dmu_buf_impl_t **dbp = (dmu_buf_impl_t **)dbp_fake;
482789Sahrens 
483789Sahrens 	if (numbufs == 0)
484789Sahrens 		return;
485789Sahrens 
4861544Seschrock 	for (i = 0; i < numbufs; i++) {
4871544Seschrock 		if (dbp[i])
4881544Seschrock 			dbuf_rele(dbp[i], tag);
4891544Seschrock 	}
490789Sahrens 
491789Sahrens 	kmem_free(dbp, sizeof (dmu_buf_t *) * numbufs);
492789Sahrens }
493789Sahrens 
494789Sahrens void
dmu_prefetch(objset_t * os,uint64_t object,uint64_t offset,uint64_t len)495789Sahrens dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, uint64_t len)
496789Sahrens {
497789Sahrens 	dnode_t *dn;
498789Sahrens 	uint64_t blkid;
4991544Seschrock 	int nblks, i, err;
500789Sahrens 
5012986Sek110237 	if (zfs_prefetch_disable)
5022986Sek110237 		return;
5032986Sek110237 
504789Sahrens 	if (len == 0) {  /* they're interested in the bonus buffer */
505*12684STom.Erickson@Sun.COM 		dn = DMU_META_DNODE(os);
506789Sahrens 
507789Sahrens 		if (object == 0 || object >= DN_MAX_OBJECT)
508789Sahrens 			return;
509789Sahrens 
510789Sahrens 		rw_enter(&dn->dn_struct_rwlock, RW_READER);
511789Sahrens 		blkid = dbuf_whichblock(dn, object * sizeof (dnode_phys_t));
512789Sahrens 		dbuf_prefetch(dn, blkid);
513789Sahrens 		rw_exit(&dn->dn_struct_rwlock);
514789Sahrens 		return;
515789Sahrens 	}
516789Sahrens 
517789Sahrens 	/*
518789Sahrens 	 * XXX - Note, if the dnode for the requested object is not
519789Sahrens 	 * already cached, we will do a *synchronous* read in the
520789Sahrens 	 * dnode_hold() call.  The same is true for any indirects.
521789Sahrens 	 */
52210298SMatthew.Ahrens@Sun.COM 	err = dnode_hold(os, object, FTAG, &dn);
5231544Seschrock 	if (err != 0)
524789Sahrens 		return;
525789Sahrens 
526789Sahrens 	rw_enter(&dn->dn_struct_rwlock, RW_READER);
527789Sahrens 	if (dn->dn_datablkshift) {
528789Sahrens 		int blkshift = dn->dn_datablkshift;
529789Sahrens 		nblks = (P2ROUNDUP(offset+len, 1<<blkshift) -
5303912Slling 		    P2ALIGN(offset, 1<<blkshift)) >> blkshift;
531789Sahrens 	} else {
532789Sahrens 		nblks = (offset < dn->dn_datablksz);
533789Sahrens 	}
534789Sahrens 
535789Sahrens 	if (nblks != 0) {
536789Sahrens 		blkid = dbuf_whichblock(dn, offset);
537789Sahrens 		for (i = 0; i < nblks; i++)
538789Sahrens 			dbuf_prefetch(dn, blkid+i);
539789Sahrens 	}
540789Sahrens 
541789Sahrens 	rw_exit(&dn->dn_struct_rwlock);
542789Sahrens 
543789Sahrens 	dnode_rele(dn, FTAG);
544789Sahrens }
545789Sahrens 
5469950SMark.Maybee@Sun.COM /*
5479950SMark.Maybee@Sun.COM  * Get the next "chunk" of file data to free.  We traverse the file from
5489950SMark.Maybee@Sun.COM  * the end so that the file gets shorter over time (if we crashes in the
5499950SMark.Maybee@Sun.COM  * middle, this will leave us in a better state).  We find allocated file
5509950SMark.Maybee@Sun.COM  * data by simply searching the allocated level 1 indirects.
5519950SMark.Maybee@Sun.COM  */
5526992Smaybee static int
get_next_chunk(dnode_t * dn,uint64_t * start,uint64_t limit)5539950SMark.Maybee@Sun.COM get_next_chunk(dnode_t *dn, uint64_t *start, uint64_t limit)
5546992Smaybee {
5559950SMark.Maybee@Sun.COM 	uint64_t len = *start - limit;
5569950SMark.Maybee@Sun.COM 	uint64_t blkcnt = 0;
5579950SMark.Maybee@Sun.COM 	uint64_t maxblks = DMU_MAX_ACCESS / (1ULL << (dn->dn_indblkshift + 1));
5589950SMark.Maybee@Sun.COM 	uint64_t iblkrange =
5597385SMark.Maybee@Sun.COM 	    dn->dn_datablksz * EPB(dn->dn_indblkshift, SPA_BLKPTRSHIFT);
5606992Smaybee 
5619950SMark.Maybee@Sun.COM 	ASSERT(limit <= *start);
5626992Smaybee 
5639950SMark.Maybee@Sun.COM 	if (len <= iblkrange * maxblks) {
5649950SMark.Maybee@Sun.COM 		*start = limit;
5656992Smaybee 		return (0);
5666992Smaybee 	}
5679950SMark.Maybee@Sun.COM 	ASSERT(ISP2(iblkrange));
5687385SMark.Maybee@Sun.COM 
5699950SMark.Maybee@Sun.COM 	while (*start > limit && blkcnt < maxblks) {
5707385SMark.Maybee@Sun.COM 		int err;
5716992Smaybee 
5729950SMark.Maybee@Sun.COM 		/* find next allocated L1 indirect */
5736992Smaybee 		err = dnode_next_offset(dn,
5749950SMark.Maybee@Sun.COM 		    DNODE_FIND_BACKWARDS, start, 2, 1, 0);
5756992Smaybee 
5769950SMark.Maybee@Sun.COM 		/* if there are no more, then we are done */
5779950SMark.Maybee@Sun.COM 		if (err == ESRCH) {
5789950SMark.Maybee@Sun.COM 			*start = limit;
5796992Smaybee 			return (0);
5809950SMark.Maybee@Sun.COM 		} else if (err) {
5819950SMark.Maybee@Sun.COM 			return (err);
5826992Smaybee 		}
5839950SMark.Maybee@Sun.COM 		blkcnt += 1;
5846992Smaybee 
5859950SMark.Maybee@Sun.COM 		/* reset offset to end of "next" block back */
5869950SMark.Maybee@Sun.COM 		*start = P2ALIGN(*start, iblkrange);
5879950SMark.Maybee@Sun.COM 		if (*start <= limit)
5889950SMark.Maybee@Sun.COM 			*start = limit;
5899950SMark.Maybee@Sun.COM 		else
5909950SMark.Maybee@Sun.COM 			*start -= 1;
5916992Smaybee 	}
5926992Smaybee 	return (0);
5936992Smaybee }
5946992Smaybee 
5956992Smaybee static int
dmu_free_long_range_impl(objset_t * os,dnode_t * dn,uint64_t offset,uint64_t length,boolean_t free_dnode)5966992Smaybee dmu_free_long_range_impl(objset_t *os, dnode_t *dn, uint64_t offset,
5976992Smaybee     uint64_t length, boolean_t free_dnode)
5986992Smaybee {
5996992Smaybee 	dmu_tx_t *tx;
6006992Smaybee 	uint64_t object_size, start, end, len;
6016992Smaybee 	boolean_t trunc = (length == DMU_OBJECT_END);
6026992Smaybee 	int align, err;
6036992Smaybee 
6046992Smaybee 	align = 1 << dn->dn_datablkshift;
6056992Smaybee 	ASSERT(align > 0);
6066992Smaybee 	object_size = align == 1 ? dn->dn_datablksz :
6076992Smaybee 	    (dn->dn_maxblkid + 1) << dn->dn_datablkshift;
6086992Smaybee 
6099396SMatthew.Ahrens@Sun.COM 	end = offset + length;
6109396SMatthew.Ahrens@Sun.COM 	if (trunc || end > object_size)
6116992Smaybee 		end = object_size;
6126992Smaybee 	if (end <= offset)
6136992Smaybee 		return (0);
6146992Smaybee 	length = end - offset;
6156992Smaybee 
6166992Smaybee 	while (length) {
6176992Smaybee 		start = end;
6189396SMatthew.Ahrens@Sun.COM 		/* assert(offset <= start) */
6196992Smaybee 		err = get_next_chunk(dn, &start, offset);
6206992Smaybee 		if (err)
6216992Smaybee 			return (err);
6226992Smaybee 		len = trunc ? DMU_OBJECT_END : end - start;
6236992Smaybee 
6246992Smaybee 		tx = dmu_tx_create(os);
6256992Smaybee 		dmu_tx_hold_free(tx, dn->dn_object, start, len);
6266992Smaybee 		err = dmu_tx_assign(tx, TXG_WAIT);
6276992Smaybee 		if (err) {
6286992Smaybee 			dmu_tx_abort(tx);
6296992Smaybee 			return (err);
6306992Smaybee 		}
6316992Smaybee 
6326992Smaybee 		dnode_free_range(dn, start, trunc ? -1 : len, tx);
6336992Smaybee 
6347385SMark.Maybee@Sun.COM 		if (start == 0 && free_dnode) {
6357385SMark.Maybee@Sun.COM 			ASSERT(trunc);
6366992Smaybee 			dnode_free(dn, tx);
6377385SMark.Maybee@Sun.COM 		}
6386992Smaybee 
6396992Smaybee 		length -= end - start;
6406992Smaybee 
6416992Smaybee 		dmu_tx_commit(tx);
6426992Smaybee 		end = start;
6436992Smaybee 	}
6446992Smaybee 	return (0);
6456992Smaybee }
6466992Smaybee 
6476992Smaybee int
dmu_free_long_range(objset_t * os,uint64_t object,uint64_t offset,uint64_t length)6486992Smaybee dmu_free_long_range(objset_t *os, uint64_t object,
6496992Smaybee     uint64_t offset, uint64_t length)
6506992Smaybee {
6516992Smaybee 	dnode_t *dn;
6526992Smaybee 	int err;
6536992Smaybee 
65410298SMatthew.Ahrens@Sun.COM 	err = dnode_hold(os, object, FTAG, &dn);
6556992Smaybee 	if (err != 0)
6566992Smaybee 		return (err);
6576992Smaybee 	err = dmu_free_long_range_impl(os, dn, offset, length, FALSE);
6586992Smaybee 	dnode_rele(dn, FTAG);
6596992Smaybee 	return (err);
6606992Smaybee }
6616992Smaybee 
6626992Smaybee int
dmu_free_object(objset_t * os,uint64_t object)6636992Smaybee dmu_free_object(objset_t *os, uint64_t object)
6646992Smaybee {
6656992Smaybee 	dnode_t *dn;
6666992Smaybee 	dmu_tx_t *tx;
6676992Smaybee 	int err;
6686992Smaybee 
66910298SMatthew.Ahrens@Sun.COM 	err = dnode_hold_impl(os, object, DNODE_MUST_BE_ALLOCATED,
6706992Smaybee 	    FTAG, &dn);
6716992Smaybee 	if (err != 0)
6726992Smaybee 		return (err);
6736992Smaybee 	if (dn->dn_nlevels == 1) {
6746992Smaybee 		tx = dmu_tx_create(os);
6756992Smaybee 		dmu_tx_hold_bonus(tx, object);
6766992Smaybee 		dmu_tx_hold_free(tx, dn->dn_object, 0, DMU_OBJECT_END);
6776992Smaybee 		err = dmu_tx_assign(tx, TXG_WAIT);
6786992Smaybee 		if (err == 0) {
6796992Smaybee 			dnode_free_range(dn, 0, DMU_OBJECT_END, tx);
6806992Smaybee 			dnode_free(dn, tx);
6816992Smaybee 			dmu_tx_commit(tx);
6826992Smaybee 		} else {
6836992Smaybee 			dmu_tx_abort(tx);
6846992Smaybee 		}
6856992Smaybee 	} else {
6866992Smaybee 		err = dmu_free_long_range_impl(os, dn, 0, DMU_OBJECT_END, TRUE);
6876992Smaybee 	}
6886992Smaybee 	dnode_rele(dn, FTAG);
6896992Smaybee 	return (err);
6906992Smaybee }
6916992Smaybee 
6921544Seschrock int
dmu_free_range(objset_t * os,uint64_t object,uint64_t offset,uint64_t size,dmu_tx_t * tx)693789Sahrens dmu_free_range(objset_t *os, uint64_t object, uint64_t offset,
694789Sahrens     uint64_t size, dmu_tx_t *tx)
695789Sahrens {
6961544Seschrock 	dnode_t *dn;
69710298SMatthew.Ahrens@Sun.COM 	int err = dnode_hold(os, object, FTAG, &dn);
6981544Seschrock 	if (err)
6991544Seschrock 		return (err);
700789Sahrens 	ASSERT(offset < UINT64_MAX);
701789Sahrens 	ASSERT(size == -1ULL || size <= UINT64_MAX - offset);
702789Sahrens 	dnode_free_range(dn, offset, size, tx);
703789Sahrens 	dnode_rele(dn, FTAG);
7041544Seschrock 	return (0);
705789Sahrens }
706789Sahrens 
7071544Seschrock int
dmu_read(objset_t * os,uint64_t object,uint64_t offset,uint64_t size,void * buf,uint32_t flags)7081544Seschrock dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
7099512SNeil.Perrin@Sun.COM     void *buf, uint32_t flags)
710789Sahrens {
711789Sahrens 	dnode_t *dn;
712789Sahrens 	dmu_buf_t **dbp;
71310209SMark.Musante@Sun.COM 	int numbufs, err;
714789Sahrens 
71510298SMatthew.Ahrens@Sun.COM 	err = dnode_hold(os, object, FTAG, &dn);
7161544Seschrock 	if (err)
7171544Seschrock 		return (err);
7183638Sbillm 
7193638Sbillm 	/*
7203638Sbillm 	 * Deal with odd block sizes, where there can't be data past the first
7213638Sbillm 	 * block.  If we ever do the tail block optimization, we will need to
7223638Sbillm 	 * handle that here as well.
7233638Sbillm 	 */
72410209SMark.Musante@Sun.COM 	if (dn->dn_maxblkid == 0) {
725789Sahrens 		int newsz = offset > dn->dn_datablksz ? 0 :
726789Sahrens 		    MIN(size, dn->dn_datablksz - offset);
727789Sahrens 		bzero((char *)buf + newsz, size - newsz);
728789Sahrens 		size = newsz;
729789Sahrens 	}
730789Sahrens 
731789Sahrens 	while (size > 0) {
732789Sahrens 		uint64_t mylen = MIN(size, DMU_MAX_ACCESS / 2);
73310209SMark.Musante@Sun.COM 		int i;
734789Sahrens 
735789Sahrens 		/*
736789Sahrens 		 * NB: we could do this block-at-a-time, but it's nice
737789Sahrens 		 * to be reading in parallel.
738789Sahrens 		 */
7392885Sahrens 		err = dmu_buf_hold_array_by_dnode(dn, offset, mylen,
7409512SNeil.Perrin@Sun.COM 		    TRUE, FTAG, &numbufs, &dbp, flags);
7411544Seschrock 		if (err)
7424944Smaybee 			break;
743789Sahrens 
744789Sahrens 		for (i = 0; i < numbufs; i++) {
745789Sahrens 			int tocpy;
746789Sahrens 			int bufoff;
747789Sahrens 			dmu_buf_t *db = dbp[i];
748789Sahrens 
749789Sahrens 			ASSERT(size > 0);
750789Sahrens 
751789Sahrens 			bufoff = offset - db->db_offset;
752789Sahrens 			tocpy = (int)MIN(db->db_size - bufoff, size);
753789Sahrens 
754789Sahrens 			bcopy((char *)db->db_data + bufoff, buf, tocpy);
755789Sahrens 
756789Sahrens 			offset += tocpy;
757789Sahrens 			size -= tocpy;
758789Sahrens 			buf = (char *)buf + tocpy;
759789Sahrens 		}
7601544Seschrock 		dmu_buf_rele_array(dbp, numbufs, FTAG);
761789Sahrens 	}
7622885Sahrens 	dnode_rele(dn, FTAG);
7634944Smaybee 	return (err);
764789Sahrens }
765789Sahrens 
766789Sahrens void
dmu_write(objset_t * os,uint64_t object,uint64_t offset,uint64_t size,const void * buf,dmu_tx_t * tx)767789Sahrens dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
768789Sahrens     const void *buf, dmu_tx_t *tx)
769789Sahrens {
770789Sahrens 	dmu_buf_t **dbp;
771789Sahrens 	int numbufs, i;
772789Sahrens 
7732391Smaybee 	if (size == 0)
7742391Smaybee 		return;
7752391Smaybee 
7761544Seschrock 	VERIFY(0 == dmu_buf_hold_array(os, object, offset, size,
7771544Seschrock 	    FALSE, FTAG, &numbufs, &dbp));
778789Sahrens 
779789Sahrens 	for (i = 0; i < numbufs; i++) {
780789Sahrens 		int tocpy;
781789Sahrens 		int bufoff;
782789Sahrens 		dmu_buf_t *db = dbp[i];
783789Sahrens 
784789Sahrens 		ASSERT(size > 0);
785789Sahrens 
786789Sahrens 		bufoff = offset - db->db_offset;
787789Sahrens 		tocpy = (int)MIN(db->db_size - bufoff, size);
788789Sahrens 
789789Sahrens 		ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
790789Sahrens 
791789Sahrens 		if (tocpy == db->db_size)
792789Sahrens 			dmu_buf_will_fill(db, tx);
793789Sahrens 		else
794789Sahrens 			dmu_buf_will_dirty(db, tx);
795789Sahrens 
796789Sahrens 		bcopy(buf, (char *)db->db_data + bufoff, tocpy);
797789Sahrens 
798789Sahrens 		if (tocpy == db->db_size)
799789Sahrens 			dmu_buf_fill_done(db, tx);
800789Sahrens 
801789Sahrens 		offset += tocpy;
802789Sahrens 		size -= tocpy;
803789Sahrens 		buf = (char *)buf + tocpy;
804789Sahrens 	}
8051544Seschrock 	dmu_buf_rele_array(dbp, numbufs, FTAG);
806789Sahrens }
807789Sahrens 
8087872STim.Haley@Sun.COM void
dmu_prealloc(objset_t * os,uint64_t object,uint64_t offset,uint64_t size,dmu_tx_t * tx)8097872STim.Haley@Sun.COM dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
8107872STim.Haley@Sun.COM     dmu_tx_t *tx)
8117872STim.Haley@Sun.COM {
8127872STim.Haley@Sun.COM 	dmu_buf_t **dbp;
8137872STim.Haley@Sun.COM 	int numbufs, i;
8147872STim.Haley@Sun.COM 
8157872STim.Haley@Sun.COM 	if (size == 0)
8167872STim.Haley@Sun.COM 		return;
8177872STim.Haley@Sun.COM 
8187872STim.Haley@Sun.COM 	VERIFY(0 == dmu_buf_hold_array(os, object, offset, size,
8197872STim.Haley@Sun.COM 	    FALSE, FTAG, &numbufs, &dbp));
8207872STim.Haley@Sun.COM 
8217872STim.Haley@Sun.COM 	for (i = 0; i < numbufs; i++) {
8227872STim.Haley@Sun.COM 		dmu_buf_t *db = dbp[i];
8237872STim.Haley@Sun.COM 
8247872STim.Haley@Sun.COM 		dmu_buf_will_not_fill(db, tx);
8257872STim.Haley@Sun.COM 	}
8267872STim.Haley@Sun.COM 	dmu_buf_rele_array(dbp, numbufs, FTAG);
8277872STim.Haley@Sun.COM }
8287872STim.Haley@Sun.COM 
82911539SChunli.Zhang@Sun.COM /*
83011539SChunli.Zhang@Sun.COM  * DMU support for xuio
83111539SChunli.Zhang@Sun.COM  */
83211539SChunli.Zhang@Sun.COM kstat_t *xuio_ksp = NULL;
83311539SChunli.Zhang@Sun.COM 
83411539SChunli.Zhang@Sun.COM int
dmu_xuio_init(xuio_t * xuio,int nblk)83511539SChunli.Zhang@Sun.COM dmu_xuio_init(xuio_t *xuio, int nblk)
83611539SChunli.Zhang@Sun.COM {
83711539SChunli.Zhang@Sun.COM 	dmu_xuio_t *priv;
83811539SChunli.Zhang@Sun.COM 	uio_t *uio = &xuio->xu_uio;
83911539SChunli.Zhang@Sun.COM 
84011539SChunli.Zhang@Sun.COM 	uio->uio_iovcnt = nblk;
84111539SChunli.Zhang@Sun.COM 	uio->uio_iov = kmem_zalloc(nblk * sizeof (iovec_t), KM_SLEEP);
84211539SChunli.Zhang@Sun.COM 
84311539SChunli.Zhang@Sun.COM 	priv = kmem_zalloc(sizeof (dmu_xuio_t), KM_SLEEP);
84411539SChunli.Zhang@Sun.COM 	priv->cnt = nblk;
84511539SChunli.Zhang@Sun.COM 	priv->bufs = kmem_zalloc(nblk * sizeof (arc_buf_t *), KM_SLEEP);
84611539SChunli.Zhang@Sun.COM 	priv->iovp = uio->uio_iov;
84711539SChunli.Zhang@Sun.COM 	XUIO_XUZC_PRIV(xuio) = priv;
84811539SChunli.Zhang@Sun.COM 
84911539SChunli.Zhang@Sun.COM 	if (XUIO_XUZC_RW(xuio) == UIO_READ)
85011539SChunli.Zhang@Sun.COM 		XUIOSTAT_INCR(xuiostat_onloan_rbuf, nblk);
85111539SChunli.Zhang@Sun.COM 	else
85211539SChunli.Zhang@Sun.COM 		XUIOSTAT_INCR(xuiostat_onloan_wbuf, nblk);
85311539SChunli.Zhang@Sun.COM 
85411539SChunli.Zhang@Sun.COM 	return (0);
85511539SChunli.Zhang@Sun.COM }
85611539SChunli.Zhang@Sun.COM 
85711539SChunli.Zhang@Sun.COM void
dmu_xuio_fini(xuio_t * xuio)85811539SChunli.Zhang@Sun.COM dmu_xuio_fini(xuio_t *xuio)
85911539SChunli.Zhang@Sun.COM {
86011539SChunli.Zhang@Sun.COM 	dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
86111539SChunli.Zhang@Sun.COM 	int nblk = priv->cnt;
86211539SChunli.Zhang@Sun.COM 
86311539SChunli.Zhang@Sun.COM 	kmem_free(priv->iovp, nblk * sizeof (iovec_t));
86411539SChunli.Zhang@Sun.COM 	kmem_free(priv->bufs, nblk * sizeof (arc_buf_t *));
86511539SChunli.Zhang@Sun.COM 	kmem_free(priv, sizeof (dmu_xuio_t));
86611539SChunli.Zhang@Sun.COM 
86711539SChunli.Zhang@Sun.COM 	if (XUIO_XUZC_RW(xuio) == UIO_READ)
86811539SChunli.Zhang@Sun.COM 		XUIOSTAT_INCR(xuiostat_onloan_rbuf, -nblk);
86911539SChunli.Zhang@Sun.COM 	else
87011539SChunli.Zhang@Sun.COM 		XUIOSTAT_INCR(xuiostat_onloan_wbuf, -nblk);
87111539SChunli.Zhang@Sun.COM }
87211539SChunli.Zhang@Sun.COM 
87311539SChunli.Zhang@Sun.COM /*
87411539SChunli.Zhang@Sun.COM  * Initialize iov[priv->next] and priv->bufs[priv->next] with { off, n, abuf }
87511539SChunli.Zhang@Sun.COM  * and increase priv->next by 1.
87611539SChunli.Zhang@Sun.COM  */
87711539SChunli.Zhang@Sun.COM int
dmu_xuio_add(xuio_t * xuio,arc_buf_t * abuf,offset_t off,size_t n)87811539SChunli.Zhang@Sun.COM dmu_xuio_add(xuio_t *xuio, arc_buf_t *abuf, offset_t off, size_t n)
87911539SChunli.Zhang@Sun.COM {
88011539SChunli.Zhang@Sun.COM 	struct iovec *iov;
88111539SChunli.Zhang@Sun.COM 	uio_t *uio = &xuio->xu_uio;
88211539SChunli.Zhang@Sun.COM 	dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
88311539SChunli.Zhang@Sun.COM 	int i = priv->next++;
88411539SChunli.Zhang@Sun.COM 
88511539SChunli.Zhang@Sun.COM 	ASSERT(i < priv->cnt);
88611539SChunli.Zhang@Sun.COM 	ASSERT(off + n <= arc_buf_size(abuf));
88711539SChunli.Zhang@Sun.COM 	iov = uio->uio_iov + i;
88811539SChunli.Zhang@Sun.COM 	iov->iov_base = (char *)abuf->b_data + off;
88911539SChunli.Zhang@Sun.COM 	iov->iov_len = n;
89011539SChunli.Zhang@Sun.COM 	priv->bufs[i] = abuf;
89111539SChunli.Zhang@Sun.COM 	return (0);
89211539SChunli.Zhang@Sun.COM }
89311539SChunli.Zhang@Sun.COM 
89411539SChunli.Zhang@Sun.COM int
dmu_xuio_cnt(xuio_t * xuio)89511539SChunli.Zhang@Sun.COM dmu_xuio_cnt(xuio_t *xuio)
89611539SChunli.Zhang@Sun.COM {
89711539SChunli.Zhang@Sun.COM 	dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
89811539SChunli.Zhang@Sun.COM 	return (priv->cnt);
89911539SChunli.Zhang@Sun.COM }
90011539SChunli.Zhang@Sun.COM 
90111539SChunli.Zhang@Sun.COM arc_buf_t *
dmu_xuio_arcbuf(xuio_t * xuio,int i)90211539SChunli.Zhang@Sun.COM dmu_xuio_arcbuf(xuio_t *xuio, int i)
90311539SChunli.Zhang@Sun.COM {
90411539SChunli.Zhang@Sun.COM 	dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
90511539SChunli.Zhang@Sun.COM 
90611539SChunli.Zhang@Sun.COM 	ASSERT(i < priv->cnt);
90711539SChunli.Zhang@Sun.COM 	return (priv->bufs[i]);
90811539SChunli.Zhang@Sun.COM }
90911539SChunli.Zhang@Sun.COM 
91011539SChunli.Zhang@Sun.COM void
dmu_xuio_clear(xuio_t * xuio,int i)91111539SChunli.Zhang@Sun.COM dmu_xuio_clear(xuio_t *xuio, int i)
91211539SChunli.Zhang@Sun.COM {
91311539SChunli.Zhang@Sun.COM 	dmu_xuio_t *priv = XUIO_XUZC_PRIV(xuio);
91411539SChunli.Zhang@Sun.COM 
91511539SChunli.Zhang@Sun.COM 	ASSERT(i < priv->cnt);
91611539SChunli.Zhang@Sun.COM 	priv->bufs[i] = NULL;
91711539SChunli.Zhang@Sun.COM }
91811539SChunli.Zhang@Sun.COM 
91911539SChunli.Zhang@Sun.COM static void
xuio_stat_init(void)92011539SChunli.Zhang@Sun.COM xuio_stat_init(void)
92111539SChunli.Zhang@Sun.COM {
92211539SChunli.Zhang@Sun.COM 	xuio_ksp = kstat_create("zfs", 0, "xuio_stats", "misc",
92311539SChunli.Zhang@Sun.COM 	    KSTAT_TYPE_NAMED, sizeof (xuio_stats) / sizeof (kstat_named_t),
92411539SChunli.Zhang@Sun.COM 	    KSTAT_FLAG_VIRTUAL);
92511539SChunli.Zhang@Sun.COM 	if (xuio_ksp != NULL) {
92611539SChunli.Zhang@Sun.COM 		xuio_ksp->ks_data = &xuio_stats;
92711539SChunli.Zhang@Sun.COM 		kstat_install(xuio_ksp);
92811539SChunli.Zhang@Sun.COM 	}
92911539SChunli.Zhang@Sun.COM }
93011539SChunli.Zhang@Sun.COM 
93111539SChunli.Zhang@Sun.COM static void
xuio_stat_fini(void)93211539SChunli.Zhang@Sun.COM xuio_stat_fini(void)
93311539SChunli.Zhang@Sun.COM {
93411539SChunli.Zhang@Sun.COM 	if (xuio_ksp != NULL) {
93511539SChunli.Zhang@Sun.COM 		kstat_delete(xuio_ksp);
93611539SChunli.Zhang@Sun.COM 		xuio_ksp = NULL;
93711539SChunli.Zhang@Sun.COM 	}
93811539SChunli.Zhang@Sun.COM }
93911539SChunli.Zhang@Sun.COM 
94011539SChunli.Zhang@Sun.COM void
xuio_stat_wbuf_copied()94111539SChunli.Zhang@Sun.COM xuio_stat_wbuf_copied()
94211539SChunli.Zhang@Sun.COM {
94311539SChunli.Zhang@Sun.COM 	XUIOSTAT_BUMP(xuiostat_wbuf_copied);
94411539SChunli.Zhang@Sun.COM }
94511539SChunli.Zhang@Sun.COM 
94611539SChunli.Zhang@Sun.COM void
xuio_stat_wbuf_nocopy()94711539SChunli.Zhang@Sun.COM xuio_stat_wbuf_nocopy()
94811539SChunli.Zhang@Sun.COM {
94911539SChunli.Zhang@Sun.COM 	XUIOSTAT_BUMP(xuiostat_wbuf_nocopy);
95011539SChunli.Zhang@Sun.COM }
95111539SChunli.Zhang@Sun.COM 
952789Sahrens #ifdef _KERNEL
953789Sahrens int
dmu_read_uio(objset_t * os,uint64_t object,uio_t * uio,uint64_t size)9543638Sbillm dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size)
9553638Sbillm {
9563638Sbillm 	dmu_buf_t **dbp;
9573638Sbillm 	int numbufs, i, err;
95811539SChunli.Zhang@Sun.COM 	xuio_t *xuio = NULL;
9593638Sbillm 
9603638Sbillm 	/*
9613638Sbillm 	 * NB: we could do this block-at-a-time, but it's nice
9623638Sbillm 	 * to be reading in parallel.
9633638Sbillm 	 */
9643638Sbillm 	err = dmu_buf_hold_array(os, object, uio->uio_loffset, size, TRUE, FTAG,
9653638Sbillm 	    &numbufs, &dbp);
9663638Sbillm 	if (err)
9673638Sbillm 		return (err);
9683638Sbillm 
96911539SChunli.Zhang@Sun.COM 	if (uio->uio_extflg == UIO_XUIO)
97011539SChunli.Zhang@Sun.COM 		xuio = (xuio_t *)uio;
97111539SChunli.Zhang@Sun.COM 
9723638Sbillm 	for (i = 0; i < numbufs; i++) {
9733638Sbillm 		int tocpy;
9743638Sbillm 		int bufoff;
9753638Sbillm 		dmu_buf_t *db = dbp[i];
9763638Sbillm 
9773638Sbillm 		ASSERT(size > 0);
9783638Sbillm 
9793638Sbillm 		bufoff = uio->uio_loffset - db->db_offset;
9803638Sbillm 		tocpy = (int)MIN(db->db_size - bufoff, size);
9813638Sbillm 
98211539SChunli.Zhang@Sun.COM 		if (xuio) {
98311539SChunli.Zhang@Sun.COM 			dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db;
98411539SChunli.Zhang@Sun.COM 			arc_buf_t *dbuf_abuf = dbi->db_buf;
98511539SChunli.Zhang@Sun.COM 			arc_buf_t *abuf = dbuf_loan_arcbuf(dbi);
98611539SChunli.Zhang@Sun.COM 			err = dmu_xuio_add(xuio, abuf, bufoff, tocpy);
98711539SChunli.Zhang@Sun.COM 			if (!err) {
98811539SChunli.Zhang@Sun.COM 				uio->uio_resid -= tocpy;
98911539SChunli.Zhang@Sun.COM 				uio->uio_loffset += tocpy;
99011539SChunli.Zhang@Sun.COM 			}
99111539SChunli.Zhang@Sun.COM 
99211539SChunli.Zhang@Sun.COM 			if (abuf == dbuf_abuf)
99311539SChunli.Zhang@Sun.COM 				XUIOSTAT_BUMP(xuiostat_rbuf_nocopy);
99411539SChunli.Zhang@Sun.COM 			else
99511539SChunli.Zhang@Sun.COM 				XUIOSTAT_BUMP(xuiostat_rbuf_copied);
99611539SChunli.Zhang@Sun.COM 		} else {
99711539SChunli.Zhang@Sun.COM 			err = uiomove((char *)db->db_data + bufoff, tocpy,
99811539SChunli.Zhang@Sun.COM 			    UIO_READ, uio);
99911539SChunli.Zhang@Sun.COM 		}
10003638Sbillm 		if (err)
10013638Sbillm 			break;
10023638Sbillm 
10033638Sbillm 		size -= tocpy;
10043638Sbillm 	}
10053638Sbillm 	dmu_buf_rele_array(dbp, numbufs, FTAG);
10063638Sbillm 
10073638Sbillm 	return (err);
10083638Sbillm }
10093638Sbillm 
101012123STim.Haley@Sun.COM static int
dmu_write_uio_dnode(dnode_t * dn,uio_t * uio,uint64_t size,dmu_tx_t * tx)101112123STim.Haley@Sun.COM dmu_write_uio_dnode(dnode_t *dn, uio_t *uio, uint64_t size, dmu_tx_t *tx)
1012789Sahrens {
1013789Sahrens 	dmu_buf_t **dbp;
101412123STim.Haley@Sun.COM 	int numbufs;
1015789Sahrens 	int err = 0;
101612123STim.Haley@Sun.COM 	int i;
1017789Sahrens 
101812123STim.Haley@Sun.COM 	err = dmu_buf_hold_array_by_dnode(dn, uio->uio_loffset, size,
101912123STim.Haley@Sun.COM 	    FALSE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH);
10201544Seschrock 	if (err)
10211544Seschrock 		return (err);
1022789Sahrens 
1023789Sahrens 	for (i = 0; i < numbufs; i++) {
1024789Sahrens 		int tocpy;
1025789Sahrens 		int bufoff;
1026789Sahrens 		dmu_buf_t *db = dbp[i];
1027789Sahrens 
1028789Sahrens 		ASSERT(size > 0);
1029789Sahrens 
10303638Sbillm 		bufoff = uio->uio_loffset - db->db_offset;
1031789Sahrens 		tocpy = (int)MIN(db->db_size - bufoff, size);
1032789Sahrens 
1033789Sahrens 		ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
1034789Sahrens 
1035789Sahrens 		if (tocpy == db->db_size)
1036789Sahrens 			dmu_buf_will_fill(db, tx);
1037789Sahrens 		else
1038789Sahrens 			dmu_buf_will_dirty(db, tx);
1039789Sahrens 
1040789Sahrens 		/*
1041789Sahrens 		 * XXX uiomove could block forever (eg. nfs-backed
1042789Sahrens 		 * pages).  There needs to be a uiolockdown() function
1043789Sahrens 		 * to lock the pages in memory, so that uiomove won't
1044789Sahrens 		 * block.
1045789Sahrens 		 */
1046789Sahrens 		err = uiomove((char *)db->db_data + bufoff, tocpy,
1047789Sahrens 		    UIO_WRITE, uio);
1048789Sahrens 
1049789Sahrens 		if (tocpy == db->db_size)
1050789Sahrens 			dmu_buf_fill_done(db, tx);
1051789Sahrens 
1052789Sahrens 		if (err)
1053789Sahrens 			break;
1054789Sahrens 
1055789Sahrens 		size -= tocpy;
1056789Sahrens 	}
105712123STim.Haley@Sun.COM 
10581544Seschrock 	dmu_buf_rele_array(dbp, numbufs, FTAG);
1059789Sahrens 	return (err);
1060789Sahrens }
10612688Smaybee 
10622688Smaybee int
dmu_write_uio_dbuf(dmu_buf_t * zdb,uio_t * uio,uint64_t size,dmu_tx_t * tx)106312123STim.Haley@Sun.COM dmu_write_uio_dbuf(dmu_buf_t *zdb, uio_t *uio, uint64_t size,
106412123STim.Haley@Sun.COM     dmu_tx_t *tx)
106512123STim.Haley@Sun.COM {
1066*12684STom.Erickson@Sun.COM 	dmu_buf_impl_t *db = (dmu_buf_impl_t *)zdb;
1067*12684STom.Erickson@Sun.COM 	dnode_t *dn;
1068*12684STom.Erickson@Sun.COM 	int err;
1069*12684STom.Erickson@Sun.COM 
107012123STim.Haley@Sun.COM 	if (size == 0)
107112123STim.Haley@Sun.COM 		return (0);
107212123STim.Haley@Sun.COM 
1073*12684STom.Erickson@Sun.COM 	DB_DNODE_ENTER(db);
1074*12684STom.Erickson@Sun.COM 	dn = DB_DNODE(db);
1075*12684STom.Erickson@Sun.COM 	err = dmu_write_uio_dnode(dn, uio, size, tx);
1076*12684STom.Erickson@Sun.COM 	DB_DNODE_EXIT(db);
1077*12684STom.Erickson@Sun.COM 
1078*12684STom.Erickson@Sun.COM 	return (err);
107912123STim.Haley@Sun.COM }
108012123STim.Haley@Sun.COM 
108112123STim.Haley@Sun.COM int
dmu_write_uio(objset_t * os,uint64_t object,uio_t * uio,uint64_t size,dmu_tx_t * tx)108212123STim.Haley@Sun.COM dmu_write_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size,
108312123STim.Haley@Sun.COM     dmu_tx_t *tx)
108412123STim.Haley@Sun.COM {
108512123STim.Haley@Sun.COM 	dnode_t *dn;
108612123STim.Haley@Sun.COM 	int err;
108712123STim.Haley@Sun.COM 
108812123STim.Haley@Sun.COM 	if (size == 0)
108912123STim.Haley@Sun.COM 		return (0);
109012123STim.Haley@Sun.COM 
109112123STim.Haley@Sun.COM 	err = dnode_hold(os, object, FTAG, &dn);
109212123STim.Haley@Sun.COM 	if (err)
109312123STim.Haley@Sun.COM 		return (err);
109412123STim.Haley@Sun.COM 
109512123STim.Haley@Sun.COM 	err = dmu_write_uio_dnode(dn, uio, size, tx);
109612123STim.Haley@Sun.COM 
109712123STim.Haley@Sun.COM 	dnode_rele(dn, FTAG);
109812123STim.Haley@Sun.COM 
109912123STim.Haley@Sun.COM 	return (err);
110012123STim.Haley@Sun.COM }
110112123STim.Haley@Sun.COM 
110212123STim.Haley@Sun.COM int
dmu_write_pages(objset_t * os,uint64_t object,uint64_t offset,uint64_t size,page_t * pp,dmu_tx_t * tx)11032688Smaybee dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
11042688Smaybee     page_t *pp, dmu_tx_t *tx)
11052688Smaybee {
11062688Smaybee 	dmu_buf_t **dbp;
11072688Smaybee 	int numbufs, i;
11082688Smaybee 	int err;
11092688Smaybee 
11102688Smaybee 	if (size == 0)
11112688Smaybee 		return (0);
11122688Smaybee 
11132688Smaybee 	err = dmu_buf_hold_array(os, object, offset, size,
11142688Smaybee 	    FALSE, FTAG, &numbufs, &dbp);
11152688Smaybee 	if (err)
11162688Smaybee 		return (err);
11172688Smaybee 
11182688Smaybee 	for (i = 0; i < numbufs; i++) {
11192688Smaybee 		int tocpy, copied, thiscpy;
11202688Smaybee 		int bufoff;
11212688Smaybee 		dmu_buf_t *db = dbp[i];
11222688Smaybee 		caddr_t va;
11232688Smaybee 
11242688Smaybee 		ASSERT(size > 0);
11252688Smaybee 		ASSERT3U(db->db_size, >=, PAGESIZE);
11262688Smaybee 
11272688Smaybee 		bufoff = offset - db->db_offset;
11282688Smaybee 		tocpy = (int)MIN(db->db_size - bufoff, size);
11292688Smaybee 
11302688Smaybee 		ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
11312688Smaybee 
11322688Smaybee 		if (tocpy == db->db_size)
11332688Smaybee 			dmu_buf_will_fill(db, tx);
11342688Smaybee 		else
11352688Smaybee 			dmu_buf_will_dirty(db, tx);
11362688Smaybee 
11372688Smaybee 		for (copied = 0; copied < tocpy; copied += PAGESIZE) {
11382688Smaybee 			ASSERT3U(pp->p_offset, ==, db->db_offset + bufoff);
11392688Smaybee 			thiscpy = MIN(PAGESIZE, tocpy - copied);
11407315SJonathan.Adams@Sun.COM 			va = zfs_map_page(pp, S_READ);
11412688Smaybee 			bcopy(va, (char *)db->db_data + bufoff, thiscpy);
11427315SJonathan.Adams@Sun.COM 			zfs_unmap_page(pp, va);
11432688Smaybee 			pp = pp->p_next;
11442688Smaybee 			bufoff += PAGESIZE;
11452688Smaybee 		}
11462688Smaybee 
11472688Smaybee 		if (tocpy == db->db_size)
11482688Smaybee 			dmu_buf_fill_done(db, tx);
11492688Smaybee 
11502688Smaybee 		offset += tocpy;
11512688Smaybee 		size -= tocpy;
11522688Smaybee 	}
11532688Smaybee 	dmu_buf_rele_array(dbp, numbufs, FTAG);
11542688Smaybee 	return (err);
11552688Smaybee }
1156789Sahrens #endif
1157789Sahrens 
11589412SAleksandr.Guzovskiy@Sun.COM /*
11599412SAleksandr.Guzovskiy@Sun.COM  * Allocate a loaned anonymous arc buffer.
11609412SAleksandr.Guzovskiy@Sun.COM  */
11619412SAleksandr.Guzovskiy@Sun.COM arc_buf_t *
dmu_request_arcbuf(dmu_buf_t * handle,int size)11629412SAleksandr.Guzovskiy@Sun.COM dmu_request_arcbuf(dmu_buf_t *handle, int size)
11639412SAleksandr.Guzovskiy@Sun.COM {
1164*12684STom.Erickson@Sun.COM 	dmu_buf_impl_t *db = (dmu_buf_impl_t *)handle;
1165*12684STom.Erickson@Sun.COM 	spa_t *spa;
11669412SAleksandr.Guzovskiy@Sun.COM 
1167*12684STom.Erickson@Sun.COM 	DB_GET_SPA(&spa, db);
1168*12684STom.Erickson@Sun.COM 	return (arc_loan_buf(spa, size));
11699412SAleksandr.Guzovskiy@Sun.COM }
11709412SAleksandr.Guzovskiy@Sun.COM 
11719412SAleksandr.Guzovskiy@Sun.COM /*
11729412SAleksandr.Guzovskiy@Sun.COM  * Free a loaned arc buffer.
11739412SAleksandr.Guzovskiy@Sun.COM  */
11749412SAleksandr.Guzovskiy@Sun.COM void
dmu_return_arcbuf(arc_buf_t * buf)11759412SAleksandr.Guzovskiy@Sun.COM dmu_return_arcbuf(arc_buf_t *buf)
11769412SAleksandr.Guzovskiy@Sun.COM {
11779412SAleksandr.Guzovskiy@Sun.COM 	arc_return_buf(buf, FTAG);
11789412SAleksandr.Guzovskiy@Sun.COM 	VERIFY(arc_buf_remove_ref(buf, FTAG) == 1);
11799412SAleksandr.Guzovskiy@Sun.COM }
11809412SAleksandr.Guzovskiy@Sun.COM 
11819412SAleksandr.Guzovskiy@Sun.COM /*
11829412SAleksandr.Guzovskiy@Sun.COM  * When possible directly assign passed loaned arc buffer to a dbuf.
11839412SAleksandr.Guzovskiy@Sun.COM  * If this is not possible copy the contents of passed arc buf via
11849412SAleksandr.Guzovskiy@Sun.COM  * dmu_write().
11859412SAleksandr.Guzovskiy@Sun.COM  */
11869412SAleksandr.Guzovskiy@Sun.COM void
dmu_assign_arcbuf(dmu_buf_t * handle,uint64_t offset,arc_buf_t * buf,dmu_tx_t * tx)11879412SAleksandr.Guzovskiy@Sun.COM dmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, arc_buf_t *buf,
11889412SAleksandr.Guzovskiy@Sun.COM     dmu_tx_t *tx)
11899412SAleksandr.Guzovskiy@Sun.COM {
1190*12684STom.Erickson@Sun.COM 	dmu_buf_impl_t *dbuf = (dmu_buf_impl_t *)handle;
1191*12684STom.Erickson@Sun.COM 	dnode_t *dn;
11929412SAleksandr.Guzovskiy@Sun.COM 	dmu_buf_impl_t *db;
11939412SAleksandr.Guzovskiy@Sun.COM 	uint32_t blksz = (uint32_t)arc_buf_size(buf);
11949412SAleksandr.Guzovskiy@Sun.COM 	uint64_t blkid;
11959412SAleksandr.Guzovskiy@Sun.COM 
1196*12684STom.Erickson@Sun.COM 	DB_DNODE_ENTER(dbuf);
1197*12684STom.Erickson@Sun.COM 	dn = DB_DNODE(dbuf);
11989412SAleksandr.Guzovskiy@Sun.COM 	rw_enter(&dn->dn_struct_rwlock, RW_READER);
11999412SAleksandr.Guzovskiy@Sun.COM 	blkid = dbuf_whichblock(dn, offset);
12009412SAleksandr.Guzovskiy@Sun.COM 	VERIFY((db = dbuf_hold(dn, blkid, FTAG)) != NULL);
12019412SAleksandr.Guzovskiy@Sun.COM 	rw_exit(&dn->dn_struct_rwlock);
1202*12684STom.Erickson@Sun.COM 	DB_DNODE_EXIT(dbuf);
12039412SAleksandr.Guzovskiy@Sun.COM 
12049412SAleksandr.Guzovskiy@Sun.COM 	if (offset == db->db.db_offset && blksz == db->db.db_size) {
12059412SAleksandr.Guzovskiy@Sun.COM 		dbuf_assign_arcbuf(db, buf, tx);
12069412SAleksandr.Guzovskiy@Sun.COM 		dbuf_rele(db, FTAG);
12079412SAleksandr.Guzovskiy@Sun.COM 	} else {
1208*12684STom.Erickson@Sun.COM 		objset_t *os;
1209*12684STom.Erickson@Sun.COM 		uint64_t object;
1210*12684STom.Erickson@Sun.COM 
1211*12684STom.Erickson@Sun.COM 		DB_DNODE_ENTER(dbuf);
1212*12684STom.Erickson@Sun.COM 		dn = DB_DNODE(dbuf);
1213*12684STom.Erickson@Sun.COM 		os = dn->dn_objset;
1214*12684STom.Erickson@Sun.COM 		object = dn->dn_object;
1215*12684STom.Erickson@Sun.COM 		DB_DNODE_EXIT(dbuf);
1216*12684STom.Erickson@Sun.COM 
12179412SAleksandr.Guzovskiy@Sun.COM 		dbuf_rele(db, FTAG);
1218*12684STom.Erickson@Sun.COM 		dmu_write(os, object, offset, blksz, buf->b_data, tx);
12199412SAleksandr.Guzovskiy@Sun.COM 		dmu_return_arcbuf(buf);
122011539SChunli.Zhang@Sun.COM 		XUIOSTAT_BUMP(xuiostat_wbuf_copied);
12219412SAleksandr.Guzovskiy@Sun.COM 	}
12229412SAleksandr.Guzovskiy@Sun.COM }
12239412SAleksandr.Guzovskiy@Sun.COM 
12242237Smaybee typedef struct {
122510922SJeff.Bonwick@Sun.COM 	dbuf_dirty_record_t	*dsa_dr;
122610922SJeff.Bonwick@Sun.COM 	dmu_sync_cb_t		*dsa_done;
122710922SJeff.Bonwick@Sun.COM 	zgd_t			*dsa_zgd;
122810922SJeff.Bonwick@Sun.COM 	dmu_tx_t		*dsa_tx;
12293547Smaybee } dmu_sync_arg_t;
12302237Smaybee 
12312237Smaybee /* ARGSUSED */
12322237Smaybee static void
dmu_sync_ready(zio_t * zio,arc_buf_t * buf,void * varg)12337754SJeff.Bonwick@Sun.COM dmu_sync_ready(zio_t *zio, arc_buf_t *buf, void *varg)
12347754SJeff.Bonwick@Sun.COM {
123510922SJeff.Bonwick@Sun.COM 	dmu_sync_arg_t *dsa = varg;
123610922SJeff.Bonwick@Sun.COM 	dmu_buf_t *db = dsa->dsa_zgd->zgd_db;
12377754SJeff.Bonwick@Sun.COM 	blkptr_t *bp = zio->io_bp;
123810800SNeil.Perrin@Sun.COM 
123910922SJeff.Bonwick@Sun.COM 	if (zio->io_error == 0) {
124010922SJeff.Bonwick@Sun.COM 		if (BP_IS_HOLE(bp)) {
124110922SJeff.Bonwick@Sun.COM 			/*
124210922SJeff.Bonwick@Sun.COM 			 * A block of zeros may compress to a hole, but the
124310922SJeff.Bonwick@Sun.COM 			 * block size still needs to be known for replay.
124410922SJeff.Bonwick@Sun.COM 			 */
124510922SJeff.Bonwick@Sun.COM 			BP_SET_LSIZE(bp, db->db_size);
124610922SJeff.Bonwick@Sun.COM 		} else {
124710922SJeff.Bonwick@Sun.COM 			ASSERT(BP_GET_LEVEL(bp) == 0);
124810922SJeff.Bonwick@Sun.COM 			bp->blk_fill = 1;
124910922SJeff.Bonwick@Sun.COM 		}
12507754SJeff.Bonwick@Sun.COM 	}
12517754SJeff.Bonwick@Sun.COM }
12527754SJeff.Bonwick@Sun.COM 
125310922SJeff.Bonwick@Sun.COM static void
dmu_sync_late_arrival_ready(zio_t * zio)125410922SJeff.Bonwick@Sun.COM dmu_sync_late_arrival_ready(zio_t *zio)
125510922SJeff.Bonwick@Sun.COM {
125610922SJeff.Bonwick@Sun.COM 	dmu_sync_ready(zio, NULL, zio->io_private);
125710922SJeff.Bonwick@Sun.COM }
125810922SJeff.Bonwick@Sun.COM 
12597754SJeff.Bonwick@Sun.COM /* ARGSUSED */
12607754SJeff.Bonwick@Sun.COM static void
dmu_sync_done(zio_t * zio,arc_buf_t * buf,void * varg)12612237Smaybee dmu_sync_done(zio_t *zio, arc_buf_t *buf, void *varg)
12622237Smaybee {
126310922SJeff.Bonwick@Sun.COM 	dmu_sync_arg_t *dsa = varg;
126410922SJeff.Bonwick@Sun.COM 	dbuf_dirty_record_t *dr = dsa->dsa_dr;
12653547Smaybee 	dmu_buf_impl_t *db = dr->dr_dbuf;
12662237Smaybee 
126710810SNeil.Perrin@Sun.COM 	mutex_enter(&db->db_mtx);
126810810SNeil.Perrin@Sun.COM 	ASSERT(dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC);
126910922SJeff.Bonwick@Sun.COM 	if (zio->io_error == 0) {
127010922SJeff.Bonwick@Sun.COM 		dr->dt.dl.dr_overridden_by = *zio->io_bp;
127110922SJeff.Bonwick@Sun.COM 		dr->dt.dl.dr_override_state = DR_OVERRIDDEN;
127210922SJeff.Bonwick@Sun.COM 		dr->dt.dl.dr_copies = zio->io_prop.zp_copies;
127310922SJeff.Bonwick@Sun.COM 		if (BP_IS_HOLE(&dr->dt.dl.dr_overridden_by))
127410922SJeff.Bonwick@Sun.COM 			BP_ZERO(&dr->dt.dl.dr_overridden_by);
127510922SJeff.Bonwick@Sun.COM 	} else {
127610922SJeff.Bonwick@Sun.COM 		dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN;
127710922SJeff.Bonwick@Sun.COM 	}
12782237Smaybee 	cv_broadcast(&db->db_changed);
127910810SNeil.Perrin@Sun.COM 	mutex_exit(&db->db_mtx);
128010810SNeil.Perrin@Sun.COM 
128110922SJeff.Bonwick@Sun.COM 	dsa->dsa_done(dsa->dsa_zgd, zio->io_error);
128210922SJeff.Bonwick@Sun.COM 
128310922SJeff.Bonwick@Sun.COM 	kmem_free(dsa, sizeof (*dsa));
128410922SJeff.Bonwick@Sun.COM }
128510922SJeff.Bonwick@Sun.COM 
128610922SJeff.Bonwick@Sun.COM static void
dmu_sync_late_arrival_done(zio_t * zio)128710922SJeff.Bonwick@Sun.COM dmu_sync_late_arrival_done(zio_t *zio)
128810922SJeff.Bonwick@Sun.COM {
128910922SJeff.Bonwick@Sun.COM 	blkptr_t *bp = zio->io_bp;
129010922SJeff.Bonwick@Sun.COM 	dmu_sync_arg_t *dsa = zio->io_private;
129110922SJeff.Bonwick@Sun.COM 
129210922SJeff.Bonwick@Sun.COM 	if (zio->io_error == 0 && !BP_IS_HOLE(bp)) {
129310922SJeff.Bonwick@Sun.COM 		ASSERT(zio->io_bp->blk_birth == zio->io_txg);
129410922SJeff.Bonwick@Sun.COM 		ASSERT(zio->io_txg > spa_syncing_txg(zio->io_spa));
129510922SJeff.Bonwick@Sun.COM 		zio_free(zio->io_spa, zio->io_txg, zio->io_bp);
129610922SJeff.Bonwick@Sun.COM 	}
129710922SJeff.Bonwick@Sun.COM 
129810922SJeff.Bonwick@Sun.COM 	dmu_tx_commit(dsa->dsa_tx);
129910922SJeff.Bonwick@Sun.COM 
130010922SJeff.Bonwick@Sun.COM 	dsa->dsa_done(dsa->dsa_zgd, zio->io_error);
130110922SJeff.Bonwick@Sun.COM 
130210922SJeff.Bonwick@Sun.COM 	kmem_free(dsa, sizeof (*dsa));
130310922SJeff.Bonwick@Sun.COM }
13043547Smaybee 
130510922SJeff.Bonwick@Sun.COM 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_t * zb)130610922SJeff.Bonwick@Sun.COM dmu_sync_late_arrival(zio_t *pio, objset_t *os, dmu_sync_cb_t *done, zgd_t *zgd,
130710922SJeff.Bonwick@Sun.COM     zio_prop_t *zp, zbookmark_t *zb)
130810922SJeff.Bonwick@Sun.COM {
130910922SJeff.Bonwick@Sun.COM 	dmu_sync_arg_t *dsa;
131010922SJeff.Bonwick@Sun.COM 	dmu_tx_t *tx;
131110922SJeff.Bonwick@Sun.COM 
131210922SJeff.Bonwick@Sun.COM 	tx = dmu_tx_create(os);
131310922SJeff.Bonwick@Sun.COM 	dmu_tx_hold_space(tx, zgd->zgd_db->db_size);
131411670SNeil.Perrin@Sun.COM 	if (dmu_tx_assign(tx, TXG_WAIT) != 0) {
131510922SJeff.Bonwick@Sun.COM 		dmu_tx_abort(tx);
131610922SJeff.Bonwick@Sun.COM 		return (EIO);	/* Make zl_get_data do txg_waited_synced() */
131710922SJeff.Bonwick@Sun.COM 	}
131810922SJeff.Bonwick@Sun.COM 
131910922SJeff.Bonwick@Sun.COM 	dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_SLEEP);
132010922SJeff.Bonwick@Sun.COM 	dsa->dsa_dr = NULL;
132110922SJeff.Bonwick@Sun.COM 	dsa->dsa_done = done;
132210922SJeff.Bonwick@Sun.COM 	dsa->dsa_zgd = zgd;
132310922SJeff.Bonwick@Sun.COM 	dsa->dsa_tx = tx;
132410922SJeff.Bonwick@Sun.COM 
132510922SJeff.Bonwick@Sun.COM 	zio_nowait(zio_write(pio, os->os_spa, dmu_tx_get_txg(tx), zgd->zgd_bp,
132610922SJeff.Bonwick@Sun.COM 	    zgd->zgd_db->db_data, zgd->zgd_db->db_size, zp,
132710922SJeff.Bonwick@Sun.COM 	    dmu_sync_late_arrival_ready, dmu_sync_late_arrival_done, dsa,
132810922SJeff.Bonwick@Sun.COM 	    ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL, zb));
132910922SJeff.Bonwick@Sun.COM 
133010922SJeff.Bonwick@Sun.COM 	return (0);
13312237Smaybee }
13322237Smaybee 
1333789Sahrens /*
13342237Smaybee  * Intent log support: sync the block associated with db to disk.
13352237Smaybee  * N.B. and XXX: the caller is responsible for making sure that the
13362237Smaybee  * data isn't changing while dmu_sync() is writing it.
1337789Sahrens  *
1338789Sahrens  * Return values:
1339789Sahrens  *
13402237Smaybee  *	EEXIST: this txg has already been synced, so there's nothing to to.
1341789Sahrens  *		The caller should not log the write.
1342789Sahrens  *
1343789Sahrens  *	ENOENT: the block was dbuf_free_range()'d, so there's nothing to do.
1344789Sahrens  *		The caller should not log the write.
1345789Sahrens  *
13462237Smaybee  *	EALREADY: this block is already in the process of being synced.
13472237Smaybee  *		The caller should track its progress (somehow).
1348789Sahrens  *
134910922SJeff.Bonwick@Sun.COM  *	EIO: could not do the I/O.
135010922SJeff.Bonwick@Sun.COM  *		The caller should do a txg_wait_synced().
1351789Sahrens  *
135210922SJeff.Bonwick@Sun.COM  *	0: the I/O has been initiated.
135310922SJeff.Bonwick@Sun.COM  *		The caller should log this blkptr in the done callback.
135410922SJeff.Bonwick@Sun.COM  *		It is possible that the I/O will fail, in which case
135510922SJeff.Bonwick@Sun.COM  *		the error will be reported to the done callback and
135610922SJeff.Bonwick@Sun.COM  *		propagated to pio from zio_done().
1357789Sahrens  */
1358789Sahrens int
dmu_sync(zio_t * pio,uint64_t txg,dmu_sync_cb_t * done,zgd_t * zgd)135910922SJeff.Bonwick@Sun.COM dmu_sync(zio_t *pio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd)
1360789Sahrens {
136110922SJeff.Bonwick@Sun.COM 	blkptr_t *bp = zgd->zgd_bp;
136210922SJeff.Bonwick@Sun.COM 	dmu_buf_impl_t *db = (dmu_buf_impl_t *)zgd->zgd_db;
136310298SMatthew.Ahrens@Sun.COM 	objset_t *os = db->db_objset;
136410922SJeff.Bonwick@Sun.COM 	dsl_dataset_t *ds = os->os_dsl_dataset;
13653547Smaybee 	dbuf_dirty_record_t *dr;
136610922SJeff.Bonwick@Sun.COM 	dmu_sync_arg_t *dsa;
13672237Smaybee 	zbookmark_t zb;
136810922SJeff.Bonwick@Sun.COM 	zio_prop_t zp;
1369*12684STom.Erickson@Sun.COM 	dnode_t *dn;
1370789Sahrens 
137110922SJeff.Bonwick@Sun.COM 	ASSERT(pio != NULL);
1372789Sahrens 	ASSERT(BP_IS_HOLE(bp));
1373789Sahrens 	ASSERT(txg != 0);
1374789Sahrens 
137510922SJeff.Bonwick@Sun.COM 	SET_BOOKMARK(&zb, ds->ds_object,
137610922SJeff.Bonwick@Sun.COM 	    db->db.db_object, db->db_level, db->db_blkid);
137710922SJeff.Bonwick@Sun.COM 
1378*12684STom.Erickson@Sun.COM 	DB_DNODE_ENTER(db);
1379*12684STom.Erickson@Sun.COM 	dn = DB_DNODE(db);
1380*12684STom.Erickson@Sun.COM 	dmu_write_policy(os, dn, db->db_level, WP_DMU_SYNC, &zp);
1381*12684STom.Erickson@Sun.COM 	DB_DNODE_EXIT(db);
1382789Sahrens 
1383789Sahrens 	/*
138410922SJeff.Bonwick@Sun.COM 	 * If we're frozen (running ziltest), we always need to generate a bp.
13851544Seschrock 	 */
138610922SJeff.Bonwick@Sun.COM 	if (txg > spa_freeze_txg(os->os_spa))
138710922SJeff.Bonwick@Sun.COM 		return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb));
13881544Seschrock 
13891544Seschrock 	/*
139010922SJeff.Bonwick@Sun.COM 	 * Grabbing db_mtx now provides a barrier between dbuf_sync_leaf()
139110922SJeff.Bonwick@Sun.COM 	 * and us.  If we determine that this txg is not yet syncing,
139210922SJeff.Bonwick@Sun.COM 	 * but it begins to sync a moment later, that's OK because the
139310922SJeff.Bonwick@Sun.COM 	 * sync thread will block in dbuf_sync_leaf() until we drop db_mtx.
1394789Sahrens 	 */
139510922SJeff.Bonwick@Sun.COM 	mutex_enter(&db->db_mtx);
139610922SJeff.Bonwick@Sun.COM 
139710922SJeff.Bonwick@Sun.COM 	if (txg <= spa_last_synced_txg(os->os_spa)) {
1398789Sahrens 		/*
139910922SJeff.Bonwick@Sun.COM 		 * This txg has already synced.  There's nothing to do.
1400789Sahrens 		 */
140110922SJeff.Bonwick@Sun.COM 		mutex_exit(&db->db_mtx);
14022237Smaybee 		return (EEXIST);
1403789Sahrens 	}
1404789Sahrens 
140510922SJeff.Bonwick@Sun.COM 	if (txg <= spa_syncing_txg(os->os_spa)) {
140610922SJeff.Bonwick@Sun.COM 		/*
140710922SJeff.Bonwick@Sun.COM 		 * This txg is currently syncing, so we can't mess with
140810922SJeff.Bonwick@Sun.COM 		 * the dirty record anymore; just write a new log block.
140910922SJeff.Bonwick@Sun.COM 		 */
141010922SJeff.Bonwick@Sun.COM 		mutex_exit(&db->db_mtx);
141110922SJeff.Bonwick@Sun.COM 		return (dmu_sync_late_arrival(pio, os, done, zgd, &zp, &zb));
14122237Smaybee 	}
14132237Smaybee 
14143547Smaybee 	dr = db->db_last_dirty;
141510922SJeff.Bonwick@Sun.COM 	while (dr && dr->dr_txg != txg)
14163547Smaybee 		dr = dr->dr_next;
141710922SJeff.Bonwick@Sun.COM 
141810922SJeff.Bonwick@Sun.COM 	if (dr == NULL) {
14192237Smaybee 		/*
142010922SJeff.Bonwick@Sun.COM 		 * There's no dr for this dbuf, so it must have been freed.
14212237Smaybee 		 * There's no need to log writes to freed blocks, so we're done.
14222237Smaybee 		 */
14232237Smaybee 		mutex_exit(&db->db_mtx);
1424789Sahrens 		return (ENOENT);
1425789Sahrens 	}
1426789Sahrens 
14273547Smaybee 	ASSERT(dr->dr_txg == txg);
142810922SJeff.Bonwick@Sun.COM 	if (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC ||
142910922SJeff.Bonwick@Sun.COM 	    dr->dt.dl.dr_override_state == DR_OVERRIDDEN) {
14303547Smaybee 		/*
143110922SJeff.Bonwick@Sun.COM 		 * We have already issued a sync write for this buffer,
143210922SJeff.Bonwick@Sun.COM 		 * or this buffer has already been synced.  It could not
143310922SJeff.Bonwick@Sun.COM 		 * have been dirtied since, or we would have cleared the state.
14343547Smaybee 		 */
14353547Smaybee 		mutex_exit(&db->db_mtx);
14363547Smaybee 		return (EALREADY);
14373547Smaybee 	}
14383547Smaybee 
143910922SJeff.Bonwick@Sun.COM 	ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN);
14403547Smaybee 	dr->dt.dl.dr_override_state = DR_IN_DMU_SYNC;
14412237Smaybee 	mutex_exit(&db->db_mtx);
14427754SJeff.Bonwick@Sun.COM 
144310922SJeff.Bonwick@Sun.COM 	dsa = kmem_alloc(sizeof (dmu_sync_arg_t), KM_SLEEP);
144410922SJeff.Bonwick@Sun.COM 	dsa->dsa_dr = dr;
144510922SJeff.Bonwick@Sun.COM 	dsa->dsa_done = done;
144610922SJeff.Bonwick@Sun.COM 	dsa->dsa_zgd = zgd;
144710922SJeff.Bonwick@Sun.COM 	dsa->dsa_tx = NULL;
14487754SJeff.Bonwick@Sun.COM 
144910922SJeff.Bonwick@Sun.COM 	zio_nowait(arc_write(pio, os->os_spa, txg,
145010922SJeff.Bonwick@Sun.COM 	    bp, dr->dt.dl.dr_data, DBUF_IS_L2CACHEABLE(db), &zp,
145110922SJeff.Bonwick@Sun.COM 	    dmu_sync_ready, dmu_sync_done, dsa,
145210922SJeff.Bonwick@Sun.COM 	    ZIO_PRIORITY_SYNC_WRITE, ZIO_FLAG_CANFAIL, &zb));
145310922SJeff.Bonwick@Sun.COM 
145410922SJeff.Bonwick@Sun.COM 	return (0);
1455789Sahrens }
1456789Sahrens 
1457789Sahrens int
dmu_object_set_blocksize(objset_t * os,uint64_t object,uint64_t size,int ibs,dmu_tx_t * tx)1458789Sahrens dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, int ibs,
1459789Sahrens 	dmu_tx_t *tx)
1460789Sahrens {
14611544Seschrock 	dnode_t *dn;
14621544Seschrock 	int err;
14631544Seschrock 
146410298SMatthew.Ahrens@Sun.COM 	err = dnode_hold(os, object, FTAG, &dn);
14651544Seschrock 	if (err)
14661544Seschrock 		return (err);
14671544Seschrock 	err = dnode_set_blksz(dn, size, ibs, tx);
1468789Sahrens 	dnode_rele(dn, FTAG);
1469789Sahrens 	return (err);
1470789Sahrens }
1471789Sahrens 
1472789Sahrens void
dmu_object_set_checksum(objset_t * os,uint64_t object,uint8_t checksum,dmu_tx_t * tx)1473789Sahrens dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum,
1474789Sahrens 	dmu_tx_t *tx)
1475789Sahrens {
14761544Seschrock 	dnode_t *dn;
14771544Seschrock 
14781544Seschrock 	/* XXX assumes dnode_hold will not get an i/o error */
147910298SMatthew.Ahrens@Sun.COM 	(void) dnode_hold(os, object, FTAG, &dn);
1480789Sahrens 	ASSERT(checksum < ZIO_CHECKSUM_FUNCTIONS);
1481789Sahrens 	dn->dn_checksum = checksum;
1482789Sahrens 	dnode_setdirty(dn, tx);
1483789Sahrens 	dnode_rele(dn, FTAG);
1484789Sahrens }
1485789Sahrens 
1486789Sahrens void
dmu_object_set_compress(objset_t * os,uint64_t object,uint8_t compress,dmu_tx_t * tx)1487789Sahrens dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress,
1488789Sahrens 	dmu_tx_t *tx)
1489789Sahrens {
14901544Seschrock 	dnode_t *dn;
14911544Seschrock 
14921544Seschrock 	/* XXX assumes dnode_hold will not get an i/o error */
149310298SMatthew.Ahrens@Sun.COM 	(void) dnode_hold(os, object, FTAG, &dn);
1494789Sahrens 	ASSERT(compress < ZIO_COMPRESS_FUNCTIONS);
1495789Sahrens 	dn->dn_compress = compress;
1496789Sahrens 	dnode_setdirty(dn, tx);
1497789Sahrens 	dnode_rele(dn, FTAG);
1498789Sahrens }
1499789Sahrens 
150010922SJeff.Bonwick@Sun.COM int zfs_mdcomp_disable = 0;
150110922SJeff.Bonwick@Sun.COM 
150210922SJeff.Bonwick@Sun.COM void
dmu_write_policy(objset_t * os,dnode_t * dn,int level,int wp,zio_prop_t * zp)150310922SJeff.Bonwick@Sun.COM dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp, zio_prop_t *zp)
150410922SJeff.Bonwick@Sun.COM {
150510922SJeff.Bonwick@Sun.COM 	dmu_object_type_t type = dn ? dn->dn_type : DMU_OT_OBJSET;
150612493SMark.Shellenbaum@Oracle.COM 	boolean_t ismd = (level > 0 || dmu_ot[type].ot_metadata ||
150712493SMark.Shellenbaum@Oracle.COM 	    (wp & WP_SPILL));
150810922SJeff.Bonwick@Sun.COM 	enum zio_checksum checksum = os->os_checksum;
150910922SJeff.Bonwick@Sun.COM 	enum zio_compress compress = os->os_compress;
151010922SJeff.Bonwick@Sun.COM 	enum zio_checksum dedup_checksum = os->os_dedup_checksum;
151110922SJeff.Bonwick@Sun.COM 	boolean_t dedup;
151210922SJeff.Bonwick@Sun.COM 	boolean_t dedup_verify = os->os_dedup_verify;
151310922SJeff.Bonwick@Sun.COM 	int copies = os->os_copies;
151410922SJeff.Bonwick@Sun.COM 
151510922SJeff.Bonwick@Sun.COM 	/*
151610922SJeff.Bonwick@Sun.COM 	 * Determine checksum setting.
151710922SJeff.Bonwick@Sun.COM 	 */
151810922SJeff.Bonwick@Sun.COM 	if (ismd) {
151910922SJeff.Bonwick@Sun.COM 		/*
152010922SJeff.Bonwick@Sun.COM 		 * Metadata always gets checksummed.  If the data
152110922SJeff.Bonwick@Sun.COM 		 * checksum is multi-bit correctable, and it's not a
152210922SJeff.Bonwick@Sun.COM 		 * ZBT-style checksum, then it's suitable for metadata
152310922SJeff.Bonwick@Sun.COM 		 * as well.  Otherwise, the metadata checksum defaults
152410922SJeff.Bonwick@Sun.COM 		 * to fletcher4.
152510922SJeff.Bonwick@Sun.COM 		 */
152610922SJeff.Bonwick@Sun.COM 		if (zio_checksum_table[checksum].ci_correctable < 1 ||
152711670SNeil.Perrin@Sun.COM 		    zio_checksum_table[checksum].ci_eck)
152810922SJeff.Bonwick@Sun.COM 			checksum = ZIO_CHECKSUM_FLETCHER_4;
152910922SJeff.Bonwick@Sun.COM 	} else {
153010922SJeff.Bonwick@Sun.COM 		checksum = zio_checksum_select(dn->dn_checksum, checksum);
153110922SJeff.Bonwick@Sun.COM 	}
153210922SJeff.Bonwick@Sun.COM 
153310922SJeff.Bonwick@Sun.COM 	/*
153410922SJeff.Bonwick@Sun.COM 	 * Determine compression setting.
153510922SJeff.Bonwick@Sun.COM 	 */
153610922SJeff.Bonwick@Sun.COM 	if (ismd) {
153710922SJeff.Bonwick@Sun.COM 		/*
153810922SJeff.Bonwick@Sun.COM 		 * XXX -- we should design a compression algorithm
153910922SJeff.Bonwick@Sun.COM 		 * that specializes in arrays of bps.
154010922SJeff.Bonwick@Sun.COM 		 */
154110922SJeff.Bonwick@Sun.COM 		compress = zfs_mdcomp_disable ? ZIO_COMPRESS_EMPTY :
154210922SJeff.Bonwick@Sun.COM 		    ZIO_COMPRESS_LZJB;
154310922SJeff.Bonwick@Sun.COM 	} else {
154410922SJeff.Bonwick@Sun.COM 		compress = zio_compress_select(dn->dn_compress, compress);
154510922SJeff.Bonwick@Sun.COM 	}
154610922SJeff.Bonwick@Sun.COM 
154710922SJeff.Bonwick@Sun.COM 	/*
154810922SJeff.Bonwick@Sun.COM 	 * Determine dedup setting.  If we are in dmu_sync(), we won't
154910922SJeff.Bonwick@Sun.COM 	 * actually dedup now because that's all done in syncing context;
155010922SJeff.Bonwick@Sun.COM 	 * but we do want to use the dedup checkum.  If the checksum is not
155110922SJeff.Bonwick@Sun.COM 	 * strong enough to ensure unique signatures, force dedup_verify.
155210922SJeff.Bonwick@Sun.COM 	 */
155310922SJeff.Bonwick@Sun.COM 	dedup = (!ismd && dedup_checksum != ZIO_CHECKSUM_OFF);
155410922SJeff.Bonwick@Sun.COM 	if (dedup) {
155510922SJeff.Bonwick@Sun.COM 		checksum = dedup_checksum;
155610922SJeff.Bonwick@Sun.COM 		if (!zio_checksum_table[checksum].ci_dedup)
155710922SJeff.Bonwick@Sun.COM 			dedup_verify = 1;
155810922SJeff.Bonwick@Sun.COM 	}
155910922SJeff.Bonwick@Sun.COM 
156010922SJeff.Bonwick@Sun.COM 	if (wp & WP_DMU_SYNC)
156110922SJeff.Bonwick@Sun.COM 		dedup = 0;
156210922SJeff.Bonwick@Sun.COM 
156310922SJeff.Bonwick@Sun.COM 	if (wp & WP_NOFILL) {
156410922SJeff.Bonwick@Sun.COM 		ASSERT(!ismd && level == 0);
156510922SJeff.Bonwick@Sun.COM 		checksum = ZIO_CHECKSUM_OFF;
156610922SJeff.Bonwick@Sun.COM 		compress = ZIO_COMPRESS_OFF;
156710922SJeff.Bonwick@Sun.COM 		dedup = B_FALSE;
156810922SJeff.Bonwick@Sun.COM 	}
156910922SJeff.Bonwick@Sun.COM 
157010922SJeff.Bonwick@Sun.COM 	zp->zp_checksum = checksum;
157110922SJeff.Bonwick@Sun.COM 	zp->zp_compress = compress;
157211935SMark.Shellenbaum@Sun.COM 	zp->zp_type = (wp & WP_SPILL) ? dn->dn_bonustype : type;
157310922SJeff.Bonwick@Sun.COM 	zp->zp_level = level;
157410922SJeff.Bonwick@Sun.COM 	zp->zp_copies = MIN(copies + ismd, spa_max_replication(os->os_spa));
157510922SJeff.Bonwick@Sun.COM 	zp->zp_dedup = dedup;
157610922SJeff.Bonwick@Sun.COM 	zp->zp_dedup_verify = dedup && dedup_verify;
157710922SJeff.Bonwick@Sun.COM }
157810922SJeff.Bonwick@Sun.COM 
15791775Sbillm int
dmu_offset_next(objset_t * os,uint64_t object,boolean_t hole,uint64_t * off)1580789Sahrens dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, uint64_t *off)
1581789Sahrens {
1582789Sahrens 	dnode_t *dn;
1583789Sahrens 	int i, err;
1584789Sahrens 
158510298SMatthew.Ahrens@Sun.COM 	err = dnode_hold(os, object, FTAG, &dn);
15861544Seschrock 	if (err)
15871544Seschrock 		return (err);
1588789Sahrens 	/*
1589789Sahrens 	 * Sync any current changes before
1590789Sahrens 	 * we go trundling through the block pointers.
1591789Sahrens 	 */
1592789Sahrens 	for (i = 0; i < TXG_SIZE; i++) {
15931596Sahrens 		if (list_link_active(&dn->dn_dirty_link[i]))
1594789Sahrens 			break;
1595789Sahrens 	}
1596789Sahrens 	if (i != TXG_SIZE) {
1597789Sahrens 		dnode_rele(dn, FTAG);
1598789Sahrens 		txg_wait_synced(dmu_objset_pool(os), 0);
159910298SMatthew.Ahrens@Sun.COM 		err = dnode_hold(os, object, FTAG, &dn);
16001544Seschrock 		if (err)
16011544Seschrock 			return (err);
1602789Sahrens 	}
1603789Sahrens 
16046992Smaybee 	err = dnode_next_offset(dn, (hole ? DNODE_FIND_HOLE : 0), off, 1, 1, 0);
1605789Sahrens 	dnode_rele(dn, FTAG);
1606789Sahrens 
1607789Sahrens 	return (err);
1608789Sahrens }
1609789Sahrens 
1610789Sahrens void
dmu_object_info_from_dnode(dnode_t * dn,dmu_object_info_t * doi)1611789Sahrens dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi)
1612789Sahrens {
161310922SJeff.Bonwick@Sun.COM 	dnode_phys_t *dnp;
161410922SJeff.Bonwick@Sun.COM 
1615789Sahrens 	rw_enter(&dn->dn_struct_rwlock, RW_READER);
1616789Sahrens 	mutex_enter(&dn->dn_mtx);
1617789Sahrens 
161810922SJeff.Bonwick@Sun.COM 	dnp = dn->dn_phys;
161910922SJeff.Bonwick@Sun.COM 
1620789Sahrens 	doi->doi_data_block_size = dn->dn_datablksz;
1621789Sahrens 	doi->doi_metadata_block_size = dn->dn_indblkshift ?
1622789Sahrens 	    1ULL << dn->dn_indblkshift : 0;
162310922SJeff.Bonwick@Sun.COM 	doi->doi_type = dn->dn_type;
162410922SJeff.Bonwick@Sun.COM 	doi->doi_bonus_type = dn->dn_bonustype;
162510922SJeff.Bonwick@Sun.COM 	doi->doi_bonus_size = dn->dn_bonuslen;
1626789Sahrens 	doi->doi_indirection = dn->dn_nlevels;
1627789Sahrens 	doi->doi_checksum = dn->dn_checksum;
1628789Sahrens 	doi->doi_compress = dn->dn_compress;
162910922SJeff.Bonwick@Sun.COM 	doi->doi_physical_blocks_512 = (DN_USED_BYTES(dnp) + 256) >> 9;
163010922SJeff.Bonwick@Sun.COM 	doi->doi_max_offset = (dnp->dn_maxblkid + 1) * dn->dn_datablksz;
163110922SJeff.Bonwick@Sun.COM 	doi->doi_fill_count = 0;
163210922SJeff.Bonwick@Sun.COM 	for (int i = 0; i < dnp->dn_nblkptr; i++)
163310922SJeff.Bonwick@Sun.COM 		doi->doi_fill_count += dnp->dn_blkptr[i].blk_fill;
1634789Sahrens 
1635789Sahrens 	mutex_exit(&dn->dn_mtx);
1636789Sahrens 	rw_exit(&dn->dn_struct_rwlock);
1637789Sahrens }
1638789Sahrens 
1639789Sahrens /*
1640789Sahrens  * Get information on a DMU object.
1641789Sahrens  * If doi is NULL, just indicates whether the object exists.
1642789Sahrens  */
1643789Sahrens int
dmu_object_info(objset_t * os,uint64_t object,dmu_object_info_t * doi)1644789Sahrens dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi)
1645789Sahrens {
16461544Seschrock 	dnode_t *dn;
164710298SMatthew.Ahrens@Sun.COM 	int err = dnode_hold(os, object, FTAG, &dn);
1648789Sahrens 
16491544Seschrock 	if (err)
16501544Seschrock 		return (err);
1651789Sahrens 
1652789Sahrens 	if (doi != NULL)
1653789Sahrens 		dmu_object_info_from_dnode(dn, doi);
1654789Sahrens 
1655789Sahrens 	dnode_rele(dn, FTAG);
1656789Sahrens 	return (0);
1657789Sahrens }
1658789Sahrens 
1659789Sahrens /*
1660789Sahrens  * As above, but faster; can be used when you have a held dbuf in hand.
1661789Sahrens  */
1662789Sahrens void
dmu_object_info_from_db(dmu_buf_t * db_fake,dmu_object_info_t * doi)1663*12684STom.Erickson@Sun.COM dmu_object_info_from_db(dmu_buf_t *db_fake, dmu_object_info_t *doi)
1664789Sahrens {
1665*12684STom.Erickson@Sun.COM 	dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
1666*12684STom.Erickson@Sun.COM 
1667*12684STom.Erickson@Sun.COM 	DB_DNODE_ENTER(db);
1668*12684STom.Erickson@Sun.COM 	dmu_object_info_from_dnode(DB_DNODE(db), doi);
1669*12684STom.Erickson@Sun.COM 	DB_DNODE_EXIT(db);
1670789Sahrens }
1671789Sahrens 
1672789Sahrens /*
1673789Sahrens  * Faster still when you only care about the size.
1674789Sahrens  * This is specifically optimized for zfs_getattr().
1675789Sahrens  */
1676789Sahrens void
dmu_object_size_from_db(dmu_buf_t * db_fake,uint32_t * blksize,u_longlong_t * nblk512)1677*12684STom.Erickson@Sun.COM dmu_object_size_from_db(dmu_buf_t *db_fake, uint32_t *blksize,
1678*12684STom.Erickson@Sun.COM     u_longlong_t *nblk512)
1679789Sahrens {
1680*12684STom.Erickson@Sun.COM 	dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
1681*12684STom.Erickson@Sun.COM 	dnode_t *dn;
1682*12684STom.Erickson@Sun.COM 
1683*12684STom.Erickson@Sun.COM 	DB_DNODE_ENTER(db);
1684*12684STom.Erickson@Sun.COM 	dn = DB_DNODE(db);
1685789Sahrens 
1686789Sahrens 	*blksize = dn->dn_datablksz;
16872082Seschrock 	/* add 1 for dnode space */
16882082Seschrock 	*nblk512 = ((DN_USED_BYTES(dn->dn_phys) + SPA_MINBLOCKSIZE/2) >>
16892082Seschrock 	    SPA_MINBLOCKSHIFT) + 1;
1690*12684STom.Erickson@Sun.COM 	DB_DNODE_EXIT(db);
1691789Sahrens }
1692789Sahrens 
1693789Sahrens void
byteswap_uint64_array(void * vbuf,size_t size)1694789Sahrens byteswap_uint64_array(void *vbuf, size_t size)
1695789Sahrens {
1696789Sahrens 	uint64_t *buf = vbuf;
1697789Sahrens 	size_t count = size >> 3;
1698789Sahrens 	int i;
1699789Sahrens 
1700789Sahrens 	ASSERT((size & 7) == 0);
1701789Sahrens 
1702789Sahrens 	for (i = 0; i < count; i++)
1703789Sahrens 		buf[i] = BSWAP_64(buf[i]);
1704789Sahrens }
1705789Sahrens 
1706789Sahrens void
byteswap_uint32_array(void * vbuf,size_t size)1707789Sahrens byteswap_uint32_array(void *vbuf, size_t size)
1708789Sahrens {
1709789Sahrens 	uint32_t *buf = vbuf;
1710789Sahrens 	size_t count = size >> 2;
1711789Sahrens 	int i;
1712789Sahrens 
1713789Sahrens 	ASSERT((size & 3) == 0);
1714789Sahrens 
1715789Sahrens 	for (i = 0; i < count; i++)
1716789Sahrens 		buf[i] = BSWAP_32(buf[i]);
1717789Sahrens }
1718789Sahrens 
1719789Sahrens void
byteswap_uint16_array(void * vbuf,size_t size)1720789Sahrens byteswap_uint16_array(void *vbuf, size_t size)
1721789Sahrens {
1722789Sahrens 	uint16_t *buf = vbuf;
1723789Sahrens 	size_t count = size >> 1;
1724789Sahrens 	int i;
1725789Sahrens 
1726789Sahrens 	ASSERT((size & 1) == 0);
1727789Sahrens 
1728789Sahrens 	for (i = 0; i < count; i++)
1729789Sahrens 		buf[i] = BSWAP_16(buf[i]);
1730789Sahrens }
1731789Sahrens 
1732789Sahrens /* ARGSUSED */
1733789Sahrens void
byteswap_uint8_array(void * vbuf,size_t size)1734789Sahrens byteswap_uint8_array(void *vbuf, size_t size)
1735789Sahrens {
1736789Sahrens }
1737789Sahrens 
1738789Sahrens void
dmu_init(void)1739789Sahrens dmu_init(void)
1740789Sahrens {
174112296SLin.Ling@Sun.COM 	zfs_dbgmsg_init();
1742*12684STom.Erickson@Sun.COM 	sa_cache_init();
1743*12684STom.Erickson@Sun.COM 	xuio_stat_init();
1744*12684STom.Erickson@Sun.COM 	dmu_objset_init();
1745*12684STom.Erickson@Sun.COM 	dnode_init();
1746789Sahrens 	dbuf_init();
174710474SRichard.Morris@Sun.COM 	zfetch_init();
1748789Sahrens 	arc_init();
17495450Sbrendan 	l2arc_init();
1750789Sahrens }
1751789Sahrens 
1752789Sahrens void
dmu_fini(void)1753789Sahrens dmu_fini(void)
1754789Sahrens {
1755*12684STom.Erickson@Sun.COM 	l2arc_fini();
1756789Sahrens 	arc_fini();
175710474SRichard.Morris@Sun.COM 	zfetch_fini();
1758*12684STom.Erickson@Sun.COM 	dbuf_fini();
1759789Sahrens 	dnode_fini();
1760*12684STom.Erickson@Sun.COM 	dmu_objset_fini();
176111539SChunli.Zhang@Sun.COM 	xuio_stat_fini();
176211935SMark.Shellenbaum@Sun.COM 	sa_cache_fini();
176312296SLin.Ling@Sun.COM 	zfs_dbgmsg_fini();
1764789Sahrens }
1765