dmu.h revision 277585
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2011, 2014 by Delphix. All rights reserved. 25 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 26 * Copyright (c) 2012, Joyent, Inc. All rights reserved. 27 * Copyright 2013 DEY Storage Systems, Inc. 28 * Copyright 2014 HybridCluster. All rights reserved. 29 */ 30 31/* Portions Copyright 2010 Robert Milkowski */ 32 33#ifndef _SYS_DMU_H 34#define _SYS_DMU_H 35 36/* 37 * This file describes the interface that the DMU provides for its 38 * consumers. 39 * 40 * The DMU also interacts with the SPA. That interface is described in 41 * dmu_spa.h. 42 */ 43 44#include <sys/types.h> 45#include <sys/param.h> 46#include <sys/cred.h> 47#include <sys/time.h> 48#include <sys/fs/zfs.h> 49 50#ifdef __cplusplus 51extern "C" { 52#endif 53 54struct uio; 55struct xuio; 56struct page; 57struct vnode; 58struct spa; 59struct zilog; 60struct zio; 61struct blkptr; 62struct zap_cursor; 63struct dsl_dataset; 64struct dsl_pool; 65struct dnode; 66struct drr_begin; 67struct drr_end; 68struct zbookmark_phys; 69struct spa; 70struct nvlist; 71struct arc_buf; 72struct zio_prop; 73struct sa_handle; 74struct file; 75 76typedef struct objset objset_t; 77typedef struct dmu_tx dmu_tx_t; 78typedef struct dsl_dir dsl_dir_t; 79 80typedef enum dmu_object_byteswap { 81 DMU_BSWAP_UINT8, 82 DMU_BSWAP_UINT16, 83 DMU_BSWAP_UINT32, 84 DMU_BSWAP_UINT64, 85 DMU_BSWAP_ZAP, 86 DMU_BSWAP_DNODE, 87 DMU_BSWAP_OBJSET, 88 DMU_BSWAP_ZNODE, 89 DMU_BSWAP_OLDACL, 90 DMU_BSWAP_ACL, 91 /* 92 * Allocating a new byteswap type number makes the on-disk format 93 * incompatible with any other format that uses the same number. 94 * 95 * Data can usually be structured to work with one of the 96 * DMU_BSWAP_UINT* or DMU_BSWAP_ZAP types. 97 */ 98 DMU_BSWAP_NUMFUNCS 99} dmu_object_byteswap_t; 100 101#define DMU_OT_NEWTYPE 0x80 102#define DMU_OT_METADATA 0x40 103#define DMU_OT_BYTESWAP_MASK 0x3f 104 105/* 106 * Defines a uint8_t object type. Object types specify if the data 107 * in the object is metadata (boolean) and how to byteswap the data 108 * (dmu_object_byteswap_t). 109 */ 110#define DMU_OT(byteswap, metadata) \ 111 (DMU_OT_NEWTYPE | \ 112 ((metadata) ? DMU_OT_METADATA : 0) | \ 113 ((byteswap) & DMU_OT_BYTESWAP_MASK)) 114 115#define DMU_OT_IS_VALID(ot) (((ot) & DMU_OT_NEWTYPE) ? \ 116 ((ot) & DMU_OT_BYTESWAP_MASK) < DMU_BSWAP_NUMFUNCS : \ 117 (ot) < DMU_OT_NUMTYPES) 118 119#define DMU_OT_IS_METADATA(ot) (((ot) & DMU_OT_NEWTYPE) ? \ 120 ((ot) & DMU_OT_METADATA) : \ 121 dmu_ot[(ot)].ot_metadata) 122 123/* 124 * These object types use bp_fill != 1 for their L0 bp's. Therefore they can't 125 * have their data embedded (i.e. use a BP_IS_EMBEDDED() bp), because bp_fill 126 * is repurposed for embedded BPs. 127 */ 128#define DMU_OT_HAS_FILL(ot) \ 129 ((ot) == DMU_OT_DNODE || (ot) == DMU_OT_OBJSET) 130 131#define DMU_OT_BYTESWAP(ot) (((ot) & DMU_OT_NEWTYPE) ? \ 132 ((ot) & DMU_OT_BYTESWAP_MASK) : \ 133 dmu_ot[(ot)].ot_byteswap) 134 135typedef enum dmu_object_type { 136 DMU_OT_NONE, 137 /* general: */ 138 DMU_OT_OBJECT_DIRECTORY, /* ZAP */ 139 DMU_OT_OBJECT_ARRAY, /* UINT64 */ 140 DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */ 141 DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */ 142 DMU_OT_BPOBJ, /* UINT64 */ 143 DMU_OT_BPOBJ_HDR, /* UINT64 */ 144 /* spa: */ 145 DMU_OT_SPACE_MAP_HEADER, /* UINT64 */ 146 DMU_OT_SPACE_MAP, /* UINT64 */ 147 /* zil: */ 148 DMU_OT_INTENT_LOG, /* UINT64 */ 149 /* dmu: */ 150 DMU_OT_DNODE, /* DNODE */ 151 DMU_OT_OBJSET, /* OBJSET */ 152 /* dsl: */ 153 DMU_OT_DSL_DIR, /* UINT64 */ 154 DMU_OT_DSL_DIR_CHILD_MAP, /* ZAP */ 155 DMU_OT_DSL_DS_SNAP_MAP, /* ZAP */ 156 DMU_OT_DSL_PROPS, /* ZAP */ 157 DMU_OT_DSL_DATASET, /* UINT64 */ 158 /* zpl: */ 159 DMU_OT_ZNODE, /* ZNODE */ 160 DMU_OT_OLDACL, /* Old ACL */ 161 DMU_OT_PLAIN_FILE_CONTENTS, /* UINT8 */ 162 DMU_OT_DIRECTORY_CONTENTS, /* ZAP */ 163 DMU_OT_MASTER_NODE, /* ZAP */ 164 DMU_OT_UNLINKED_SET, /* ZAP */ 165 /* zvol: */ 166 DMU_OT_ZVOL, /* UINT8 */ 167 DMU_OT_ZVOL_PROP, /* ZAP */ 168 /* other; for testing only! */ 169 DMU_OT_PLAIN_OTHER, /* UINT8 */ 170 DMU_OT_UINT64_OTHER, /* UINT64 */ 171 DMU_OT_ZAP_OTHER, /* ZAP */ 172 /* new object types: */ 173 DMU_OT_ERROR_LOG, /* ZAP */ 174 DMU_OT_SPA_HISTORY, /* UINT8 */ 175 DMU_OT_SPA_HISTORY_OFFSETS, /* spa_his_phys_t */ 176 DMU_OT_POOL_PROPS, /* ZAP */ 177 DMU_OT_DSL_PERMS, /* ZAP */ 178 DMU_OT_ACL, /* ACL */ 179 DMU_OT_SYSACL, /* SYSACL */ 180 DMU_OT_FUID, /* FUID table (Packed NVLIST UINT8) */ 181 DMU_OT_FUID_SIZE, /* FUID table size UINT64 */ 182 DMU_OT_NEXT_CLONES, /* ZAP */ 183 DMU_OT_SCAN_QUEUE, /* ZAP */ 184 DMU_OT_USERGROUP_USED, /* ZAP */ 185 DMU_OT_USERGROUP_QUOTA, /* ZAP */ 186 DMU_OT_USERREFS, /* ZAP */ 187 DMU_OT_DDT_ZAP, /* ZAP */ 188 DMU_OT_DDT_STATS, /* ZAP */ 189 DMU_OT_SA, /* System attr */ 190 DMU_OT_SA_MASTER_NODE, /* ZAP */ 191 DMU_OT_SA_ATTR_REGISTRATION, /* ZAP */ 192 DMU_OT_SA_ATTR_LAYOUTS, /* ZAP */ 193 DMU_OT_SCAN_XLATE, /* ZAP */ 194 DMU_OT_DEDUP, /* fake dedup BP from ddt_bp_create() */ 195 DMU_OT_DEADLIST, /* ZAP */ 196 DMU_OT_DEADLIST_HDR, /* UINT64 */ 197 DMU_OT_DSL_CLONES, /* ZAP */ 198 DMU_OT_BPOBJ_SUBOBJ, /* UINT64 */ 199 /* 200 * Do not allocate new object types here. Doing so makes the on-disk 201 * format incompatible with any other format that uses the same object 202 * type number. 203 * 204 * When creating an object which does not have one of the above types 205 * use the DMU_OTN_* type with the correct byteswap and metadata 206 * values. 207 * 208 * The DMU_OTN_* types do not have entries in the dmu_ot table, 209 * use the DMU_OT_IS_METDATA() and DMU_OT_BYTESWAP() macros instead 210 * of indexing into dmu_ot directly (this works for both DMU_OT_* types 211 * and DMU_OTN_* types). 212 */ 213 DMU_OT_NUMTYPES, 214 215 /* 216 * Names for valid types declared with DMU_OT(). 217 */ 218 DMU_OTN_UINT8_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE), 219 DMU_OTN_UINT8_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE), 220 DMU_OTN_UINT16_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE), 221 DMU_OTN_UINT16_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE), 222 DMU_OTN_UINT32_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE), 223 DMU_OTN_UINT32_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE), 224 DMU_OTN_UINT64_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE), 225 DMU_OTN_UINT64_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE), 226 DMU_OTN_ZAP_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE), 227 DMU_OTN_ZAP_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE), 228} dmu_object_type_t; 229 230typedef enum txg_how { 231 TXG_WAIT = 1, 232 TXG_NOWAIT, 233 TXG_WAITED, 234} txg_how_t; 235 236void byteswap_uint64_array(void *buf, size_t size); 237void byteswap_uint32_array(void *buf, size_t size); 238void byteswap_uint16_array(void *buf, size_t size); 239void byteswap_uint8_array(void *buf, size_t size); 240void zap_byteswap(void *buf, size_t size); 241void zfs_oldacl_byteswap(void *buf, size_t size); 242void zfs_acl_byteswap(void *buf, size_t size); 243void zfs_znode_byteswap(void *buf, size_t size); 244 245#define DS_FIND_SNAPSHOTS (1<<0) 246#define DS_FIND_CHILDREN (1<<1) 247 248/* 249 * The maximum number of bytes that can be accessed as part of one 250 * operation, including metadata. 251 */ 252#define DMU_MAX_ACCESS (32 * 1024 * 1024) /* 32MB */ 253#define DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */ 254 255#define DMU_USERUSED_OBJECT (-1ULL) 256#define DMU_GROUPUSED_OBJECT (-2ULL) 257 258/* 259 * artificial blkids for bonus buffer and spill blocks 260 */ 261#define DMU_BONUS_BLKID (-1ULL) 262#define DMU_SPILL_BLKID (-2ULL) 263/* 264 * Public routines to create, destroy, open, and close objsets. 265 */ 266int dmu_objset_hold(const char *name, void *tag, objset_t **osp); 267int dmu_objset_own(const char *name, dmu_objset_type_t type, 268 boolean_t readonly, void *tag, objset_t **osp); 269void dmu_objset_rele(objset_t *os, void *tag); 270void dmu_objset_disown(objset_t *os, void *tag); 271int dmu_objset_open_ds(struct dsl_dataset *ds, objset_t **osp); 272 273void dmu_objset_evict_dbufs(objset_t *os); 274int dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, 275 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg); 276int dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 277 struct nvlist *snaps); 278int dmu_objset_clone(const char *name, const char *origin); 279int dsl_destroy_snapshots_nvl(struct nvlist *snaps, boolean_t defer, 280 struct nvlist *errlist); 281int dmu_objset_snapshot_one(const char *fsname, const char *snapname); 282int dmu_objset_snapshot_tmp(const char *, const char *, int); 283int dmu_objset_find(char *name, int func(const char *, void *), void *arg, 284 int flags); 285void dmu_objset_byteswap(void *buf, size_t size); 286int dsl_dataset_rename_snapshot(const char *fsname, 287 const char *oldsnapname, const char *newsnapname, boolean_t recursive); 288 289typedef struct dmu_buf { 290 uint64_t db_object; /* object that this buffer is part of */ 291 uint64_t db_offset; /* byte offset in this object */ 292 uint64_t db_size; /* size of buffer in bytes */ 293 void *db_data; /* data in buffer */ 294} dmu_buf_t; 295 296typedef void dmu_buf_evict_func_t(struct dmu_buf *db, void *user_ptr); 297 298/* 299 * The names of zap entries in the DIRECTORY_OBJECT of the MOS. 300 */ 301#define DMU_POOL_DIRECTORY_OBJECT 1 302#define DMU_POOL_CONFIG "config" 303#define DMU_POOL_FEATURES_FOR_WRITE "features_for_write" 304#define DMU_POOL_FEATURES_FOR_READ "features_for_read" 305#define DMU_POOL_FEATURE_DESCRIPTIONS "feature_descriptions" 306#define DMU_POOL_FEATURE_ENABLED_TXG "feature_enabled_txg" 307#define DMU_POOL_ROOT_DATASET "root_dataset" 308#define DMU_POOL_SYNC_BPOBJ "sync_bplist" 309#define DMU_POOL_ERRLOG_SCRUB "errlog_scrub" 310#define DMU_POOL_ERRLOG_LAST "errlog_last" 311#define DMU_POOL_SPARES "spares" 312#define DMU_POOL_DEFLATE "deflate" 313#define DMU_POOL_HISTORY "history" 314#define DMU_POOL_PROPS "pool_props" 315#define DMU_POOL_L2CACHE "l2cache" 316#define DMU_POOL_TMP_USERREFS "tmp_userrefs" 317#define DMU_POOL_DDT "DDT-%s-%s-%s" 318#define DMU_POOL_DDT_STATS "DDT-statistics" 319#define DMU_POOL_CREATION_VERSION "creation_version" 320#define DMU_POOL_SCAN "scan" 321#define DMU_POOL_FREE_BPOBJ "free_bpobj" 322#define DMU_POOL_BPTREE_OBJ "bptree_obj" 323#define DMU_POOL_EMPTY_BPOBJ "empty_bpobj" 324 325/* 326 * Allocate an object from this objset. The range of object numbers 327 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode. 328 * 329 * The transaction must be assigned to a txg. The newly allocated 330 * object will be "held" in the transaction (ie. you can modify the 331 * newly allocated object in this transaction). 332 * 333 * dmu_object_alloc() chooses an object and returns it in *objectp. 334 * 335 * dmu_object_claim() allocates a specific object number. If that 336 * number is already allocated, it fails and returns EEXIST. 337 * 338 * Return 0 on success, or ENOSPC or EEXIST as specified above. 339 */ 340uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot, 341 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 342int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 343 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 344int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 345 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *txp); 346 347/* 348 * Free an object from this objset. 349 * 350 * The object's data will be freed as well (ie. you don't need to call 351 * dmu_free(object, 0, -1, tx)). 352 * 353 * The object need not be held in the transaction. 354 * 355 * If there are any holds on this object's buffers (via dmu_buf_hold()), 356 * or tx holds on the object (via dmu_tx_hold_object()), you can not 357 * free it; it fails and returns EBUSY. 358 * 359 * If the object is not allocated, it fails and returns ENOENT. 360 * 361 * Return 0 on success, or EBUSY or ENOENT as specified above. 362 */ 363int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx); 364 365/* 366 * Find the next allocated or free object. 367 * 368 * The objectp parameter is in-out. It will be updated to be the next 369 * object which is allocated. Ignore objects which have not been 370 * modified since txg. 371 * 372 * XXX Can only be called on a objset with no dirty data. 373 * 374 * Returns 0 on success, or ENOENT if there are no more objects. 375 */ 376int dmu_object_next(objset_t *os, uint64_t *objectp, 377 boolean_t hole, uint64_t txg); 378 379/* 380 * Set the data blocksize for an object. 381 * 382 * The object cannot have any blocks allcated beyond the first. If 383 * the first block is allocated already, the new size must be greater 384 * than the current block size. If these conditions are not met, 385 * ENOTSUP will be returned. 386 * 387 * Returns 0 on success, or EBUSY if there are any holds on the object 388 * contents, or ENOTSUP as described above. 389 */ 390int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, 391 int ibs, dmu_tx_t *tx); 392 393/* 394 * Set the checksum property on a dnode. The new checksum algorithm will 395 * apply to all newly written blocks; existing blocks will not be affected. 396 */ 397void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum, 398 dmu_tx_t *tx); 399 400/* 401 * Set the compress property on a dnode. The new compression algorithm will 402 * apply to all newly written blocks; existing blocks will not be affected. 403 */ 404void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress, 405 dmu_tx_t *tx); 406 407void 408dmu_write_embedded(objset_t *os, uint64_t object, uint64_t offset, 409 void *data, uint8_t etype, uint8_t comp, int uncompressed_size, 410 int compressed_size, int byteorder, dmu_tx_t *tx); 411 412/* 413 * Decide how to write a block: checksum, compression, number of copies, etc. 414 */ 415#define WP_NOFILL 0x1 416#define WP_DMU_SYNC 0x2 417#define WP_SPILL 0x4 418 419void dmu_write_policy(objset_t *os, struct dnode *dn, int level, int wp, 420 struct zio_prop *zp); 421/* 422 * The bonus data is accessed more or less like a regular buffer. 423 * You must dmu_bonus_hold() to get the buffer, which will give you a 424 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus 425 * data. As with any normal buffer, you must call dmu_buf_read() to 426 * read db_data, dmu_buf_will_dirty() before modifying it, and the 427 * object must be held in an assigned transaction before calling 428 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus 429 * buffer as well. You must release your hold with dmu_buf_rele(). 430 * 431 * Returns ENOENT, EIO, or 0. 432 */ 433int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **); 434int dmu_bonus_max(void); 435int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *); 436int dmu_set_bonustype(dmu_buf_t *, dmu_object_type_t, dmu_tx_t *); 437dmu_object_type_t dmu_get_bonustype(dmu_buf_t *); 438int dmu_rm_spill(objset_t *, uint64_t, dmu_tx_t *); 439 440/* 441 * Special spill buffer support used by "SA" framework 442 */ 443 444int dmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp); 445int dmu_spill_hold_by_dnode(struct dnode *dn, uint32_t flags, 446 void *tag, dmu_buf_t **dbp); 447int dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp); 448 449/* 450 * Obtain the DMU buffer from the specified object which contains the 451 * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so 452 * that it will remain in memory. You must release the hold with 453 * dmu_buf_rele(). You musn't access the dmu_buf_t after releasing your 454 * hold. You must have a hold on any dmu_buf_t* you pass to the DMU. 455 * 456 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill 457 * on the returned buffer before reading or writing the buffer's 458 * db_data. The comments for those routines describe what particular 459 * operations are valid after calling them. 460 * 461 * The object number must be a valid, allocated object number. 462 */ 463int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset, 464 void *tag, dmu_buf_t **, int flags); 465void dmu_buf_add_ref(dmu_buf_t *db, void* tag); 466void dmu_buf_rele(dmu_buf_t *db, void *tag); 467uint64_t dmu_buf_refcount(dmu_buf_t *db); 468 469/* 470 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a 471 * range of an object. A pointer to an array of dmu_buf_t*'s is 472 * returned (in *dbpp). 473 * 474 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and 475 * frees the array. The hold on the array of buffers MUST be released 476 * with dmu_buf_rele_array. You can NOT release the hold on each buffer 477 * individually with dmu_buf_rele. 478 */ 479int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset, 480 uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp); 481void dmu_buf_rele_array(dmu_buf_t **, int numbufs, void *tag); 482 483/* 484 * Returns NULL on success, or the existing user ptr if it's already 485 * been set. 486 * 487 * user_ptr is for use by the user and can be obtained via dmu_buf_get_user(). 488 * 489 * If non-NULL, pageout func will be called when this buffer is being 490 * excised from the cache, so that you can clean up the data structure 491 * pointed to by user_ptr. 492 * 493 * dmu_evict_user() will call the pageout func for all buffers in a 494 * objset with a given pageout func. 495 */ 496void *dmu_buf_set_user(dmu_buf_t *db, void *user_ptr, 497 dmu_buf_evict_func_t *pageout_func); 498/* 499 * set_user_ie is the same as set_user, but request immediate eviction 500 * when hold count goes to zero. 501 */ 502void *dmu_buf_set_user_ie(dmu_buf_t *db, void *user_ptr, 503 dmu_buf_evict_func_t *pageout_func); 504void *dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, 505 void *user_ptr, dmu_buf_evict_func_t *pageout_func); 506void dmu_evict_user(objset_t *os, dmu_buf_evict_func_t *func); 507 508/* 509 * Returns the user_ptr set with dmu_buf_set_user(), or NULL if not set. 510 */ 511void *dmu_buf_get_user(dmu_buf_t *db); 512 513/* 514 * Returns the blkptr associated with this dbuf, or NULL if not set. 515 */ 516struct blkptr *dmu_buf_get_blkptr(dmu_buf_t *db); 517 518/* 519 * Indicate that you are going to modify the buffer's data (db_data). 520 * 521 * The transaction (tx) must be assigned to a txg (ie. you've called 522 * dmu_tx_assign()). The buffer's object must be held in the tx 523 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)). 524 */ 525void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx); 526 527/* 528 * Tells if the given dbuf is freeable. 529 */ 530boolean_t dmu_buf_freeable(dmu_buf_t *); 531 532/* 533 * You must create a transaction, then hold the objects which you will 534 * (or might) modify as part of this transaction. Then you must assign 535 * the transaction to a transaction group. Once the transaction has 536 * been assigned, you can modify buffers which belong to held objects as 537 * part of this transaction. You can't modify buffers before the 538 * transaction has been assigned; you can't modify buffers which don't 539 * belong to objects which this transaction holds; you can't hold 540 * objects once the transaction has been assigned. You may hold an 541 * object which you are going to free (with dmu_object_free()), but you 542 * don't have to. 543 * 544 * You can abort the transaction before it has been assigned. 545 * 546 * Note that you may hold buffers (with dmu_buf_hold) at any time, 547 * regardless of transaction state. 548 */ 549 550#define DMU_NEW_OBJECT (-1ULL) 551#define DMU_OBJECT_END (-1ULL) 552 553dmu_tx_t *dmu_tx_create(objset_t *os); 554void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len); 555void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off, 556 uint64_t len); 557void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, const char *name); 558void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object); 559void dmu_tx_hold_spill(dmu_tx_t *tx, uint64_t object); 560void dmu_tx_hold_sa(dmu_tx_t *tx, struct sa_handle *hdl, boolean_t may_grow); 561void dmu_tx_hold_sa_create(dmu_tx_t *tx, int total_size); 562void dmu_tx_abort(dmu_tx_t *tx); 563int dmu_tx_assign(dmu_tx_t *tx, enum txg_how txg_how); 564void dmu_tx_wait(dmu_tx_t *tx); 565void dmu_tx_commit(dmu_tx_t *tx); 566void dmu_tx_mark_netfree(dmu_tx_t *tx); 567 568/* 569 * To register a commit callback, dmu_tx_callback_register() must be called. 570 * 571 * dcb_data is a pointer to caller private data that is passed on as a 572 * callback parameter. The caller is responsible for properly allocating and 573 * freeing it. 574 * 575 * When registering a callback, the transaction must be already created, but 576 * it cannot be committed or aborted. It can be assigned to a txg or not. 577 * 578 * The callback will be called after the transaction has been safely written 579 * to stable storage and will also be called if the dmu_tx is aborted. 580 * If there is any error which prevents the transaction from being committed to 581 * disk, the callback will be called with a value of error != 0. 582 */ 583typedef void dmu_tx_callback_func_t(void *dcb_data, int error); 584 585void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func, 586 void *dcb_data); 587 588/* 589 * Free up the data blocks for a defined range of a file. If size is 590 * -1, the range from offset to end-of-file is freed. 591 */ 592int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset, 593 uint64_t size, dmu_tx_t *tx); 594int dmu_free_long_range(objset_t *os, uint64_t object, uint64_t offset, 595 uint64_t size); 596int dmu_free_long_object(objset_t *os, uint64_t object); 597 598/* 599 * Convenience functions. 600 * 601 * Canfail routines will return 0 on success, or an errno if there is a 602 * nonrecoverable I/O error. 603 */ 604#define DMU_READ_PREFETCH 0 /* prefetch */ 605#define DMU_READ_NO_PREFETCH 1 /* don't prefetch */ 606int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 607 void *buf, uint32_t flags); 608void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 609 const void *buf, dmu_tx_t *tx); 610void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 611 dmu_tx_t *tx); 612int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size); 613int dmu_read_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size); 614int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size, 615 dmu_tx_t *tx); 616int dmu_write_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size, 617 dmu_tx_t *tx); 618#ifdef _KERNEL 619#ifdef sun 620int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, 621 uint64_t size, struct page *pp, dmu_tx_t *tx); 622#else 623int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, 624 uint64_t size, struct vm_page **ppa, dmu_tx_t *tx); 625#endif 626#endif 627struct arc_buf *dmu_request_arcbuf(dmu_buf_t *handle, int size); 628void dmu_return_arcbuf(struct arc_buf *buf); 629void dmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, struct arc_buf *buf, 630 dmu_tx_t *tx); 631int dmu_xuio_init(struct xuio *uio, int niov); 632void dmu_xuio_fini(struct xuio *uio); 633int dmu_xuio_add(struct xuio *uio, struct arc_buf *abuf, offset_t off, 634 size_t n); 635int dmu_xuio_cnt(struct xuio *uio); 636struct arc_buf *dmu_xuio_arcbuf(struct xuio *uio, int i); 637void dmu_xuio_clear(struct xuio *uio, int i); 638void xuio_stat_wbuf_copied(); 639void xuio_stat_wbuf_nocopy(); 640 641extern int zfs_prefetch_disable; 642extern int zfs_max_recordsize; 643 644/* 645 * Asynchronously try to read in the data. 646 */ 647void dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, 648 uint64_t len); 649 650typedef struct dmu_object_info { 651 /* All sizes are in bytes unless otherwise indicated. */ 652 uint32_t doi_data_block_size; 653 uint32_t doi_metadata_block_size; 654 dmu_object_type_t doi_type; 655 dmu_object_type_t doi_bonus_type; 656 uint64_t doi_bonus_size; 657 uint8_t doi_indirection; /* 2 = dnode->indirect->data */ 658 uint8_t doi_checksum; 659 uint8_t doi_compress; 660 uint8_t doi_nblkptr; 661 uint8_t doi_pad[4]; 662 uint64_t doi_physical_blocks_512; /* data + metadata, 512b blks */ 663 uint64_t doi_max_offset; 664 uint64_t doi_fill_count; /* number of non-empty blocks */ 665} dmu_object_info_t; 666 667typedef void arc_byteswap_func_t(void *buf, size_t size); 668 669typedef struct dmu_object_type_info { 670 dmu_object_byteswap_t ot_byteswap; 671 boolean_t ot_metadata; 672 char *ot_name; 673} dmu_object_type_info_t; 674 675typedef struct dmu_object_byteswap_info { 676 arc_byteswap_func_t *ob_func; 677 char *ob_name; 678} dmu_object_byteswap_info_t; 679 680extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES]; 681extern const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS]; 682 683/* 684 * Get information on a DMU object. 685 * 686 * Return 0 on success or ENOENT if object is not allocated. 687 * 688 * If doi is NULL, just indicates whether the object exists. 689 */ 690int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi); 691/* Like dmu_object_info, but faster if you have a held dnode in hand. */ 692void dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi); 693/* Like dmu_object_info, but faster if you have a held dbuf in hand. */ 694void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi); 695/* 696 * Like dmu_object_info_from_db, but faster still when you only care about 697 * the size. This is specifically optimized for zfs_getattr(). 698 */ 699void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize, 700 u_longlong_t *nblk512); 701 702typedef struct dmu_objset_stats { 703 uint64_t dds_num_clones; /* number of clones of this */ 704 uint64_t dds_creation_txg; 705 uint64_t dds_guid; 706 dmu_objset_type_t dds_type; 707 uint8_t dds_is_snapshot; 708 uint8_t dds_inconsistent; 709 char dds_origin[MAXNAMELEN]; 710} dmu_objset_stats_t; 711 712/* 713 * Get stats on a dataset. 714 */ 715void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat); 716 717/* 718 * Add entries to the nvlist for all the objset's properties. See 719 * zfs_prop_table[] and zfs(1m) for details on the properties. 720 */ 721void dmu_objset_stats(objset_t *os, struct nvlist *nv); 722 723/* 724 * Get the space usage statistics for statvfs(). 725 * 726 * refdbytes is the amount of space "referenced" by this objset. 727 * availbytes is the amount of space available to this objset, taking 728 * into account quotas & reservations, assuming that no other objsets 729 * use the space first. These values correspond to the 'referenced' and 730 * 'available' properties, described in the zfs(1m) manpage. 731 * 732 * usedobjs and availobjs are the number of objects currently allocated, 733 * and available. 734 */ 735void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 736 uint64_t *usedobjsp, uint64_t *availobjsp); 737 738/* 739 * The fsid_guid is a 56-bit ID that can change to avoid collisions. 740 * (Contrast with the ds_guid which is a 64-bit ID that will never 741 * change, so there is a small probability that it will collide.) 742 */ 743uint64_t dmu_objset_fsid_guid(objset_t *os); 744 745/* 746 * Get the [cm]time for an objset's snapshot dir 747 */ 748timestruc_t dmu_objset_snap_cmtime(objset_t *os); 749 750int dmu_objset_is_snapshot(objset_t *os); 751 752extern struct spa *dmu_objset_spa(objset_t *os); 753extern struct zilog *dmu_objset_zil(objset_t *os); 754extern struct dsl_pool *dmu_objset_pool(objset_t *os); 755extern struct dsl_dataset *dmu_objset_ds(objset_t *os); 756extern void dmu_objset_name(objset_t *os, char *buf); 757extern dmu_objset_type_t dmu_objset_type(objset_t *os); 758extern uint64_t dmu_objset_id(objset_t *os); 759extern zfs_sync_type_t dmu_objset_syncprop(objset_t *os); 760extern zfs_logbias_op_t dmu_objset_logbias(objset_t *os); 761extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 762 uint64_t *id, uint64_t *offp, boolean_t *case_conflict); 763extern int dmu_snapshot_realname(objset_t *os, char *name, char *real, 764 int maxlen, boolean_t *conflict); 765extern int dmu_dir_list_next(objset_t *os, int namelen, char *name, 766 uint64_t *idp, uint64_t *offp); 767 768typedef int objset_used_cb_t(dmu_object_type_t bonustype, 769 void *bonus, uint64_t *userp, uint64_t *groupp); 770extern void dmu_objset_register_type(dmu_objset_type_t ost, 771 objset_used_cb_t *cb); 772extern void dmu_objset_set_user(objset_t *os, void *user_ptr); 773extern void *dmu_objset_get_user(objset_t *os); 774 775/* 776 * Return the txg number for the given assigned transaction. 777 */ 778uint64_t dmu_tx_get_txg(dmu_tx_t *tx); 779 780/* 781 * Synchronous write. 782 * If a parent zio is provided this function initiates a write on the 783 * provided buffer as a child of the parent zio. 784 * In the absence of a parent zio, the write is completed synchronously. 785 * At write completion, blk is filled with the bp of the written block. 786 * Note that while the data covered by this function will be on stable 787 * storage when the write completes this new data does not become a 788 * permanent part of the file until the associated transaction commits. 789 */ 790 791/* 792 * {zfs,zvol,ztest}_get_done() args 793 */ 794typedef struct zgd { 795 struct zilog *zgd_zilog; 796 struct blkptr *zgd_bp; 797 dmu_buf_t *zgd_db; 798 struct rl *zgd_rl; 799 void *zgd_private; 800} zgd_t; 801 802typedef void dmu_sync_cb_t(zgd_t *arg, int error); 803int dmu_sync(struct zio *zio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd); 804 805/* 806 * Find the next hole or data block in file starting at *off 807 * Return found offset in *off. Return ESRCH for end of file. 808 */ 809int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, 810 uint64_t *off); 811 812/* 813 * Initial setup and final teardown. 814 */ 815extern void dmu_init(void); 816extern void dmu_fini(void); 817 818typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp, 819 uint64_t object, uint64_t offset, int len); 820void dmu_traverse_objset(objset_t *os, uint64_t txg_start, 821 dmu_traverse_cb_t cb, void *arg); 822int dmu_diff(const char *tosnap_name, const char *fromsnap_name, 823 struct file *fp, offset_t *offp); 824 825/* CRC64 table */ 826#define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */ 827extern uint64_t zfs_crc64_table[256]; 828 829extern int zfs_mdcomp_disable; 830 831#ifdef __cplusplus 832} 833#endif 834 835#endif /* _SYS_DMU_H */ 836