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