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 #ifndef _SYS_DMU_H 26 #define _SYS_DMU_H 27 28 /* 29 * This file describes the interface that the DMU provides for its 30 * consumers. 31 * 32 * The DMU also interacts with the SPA. That interface is described in 33 * dmu_spa.h. 34 */ 35 36 #include <sys/inttypes.h> 37 #include <sys/types.h> 38 #include <sys/param.h> 39 #include <sys/cred.h> 40 #include <sys/time.h> 41 42 #ifdef __cplusplus 43 extern "C" { 44 #endif 45 46 struct uio; 47 struct xuio; 48 struct page; 49 struct vnode; 50 struct spa; 51 struct zilog; 52 struct zio; 53 struct blkptr; 54 struct zap_cursor; 55 struct dsl_dataset; 56 struct dsl_pool; 57 struct dnode; 58 struct drr_begin; 59 struct drr_end; 60 struct zbookmark; 61 struct spa; 62 struct nvlist; 63 struct arc_buf; 64 struct zio_prop; 65 struct sa_handle; 66 67 typedef struct objset objset_t; 68 typedef struct dmu_tx dmu_tx_t; 69 typedef struct dsl_dir dsl_dir_t; 70 71 typedef enum dmu_object_type { 72 DMU_OT_NONE, 73 /* general: */ 74 DMU_OT_OBJECT_DIRECTORY, /* ZAP */ 75 DMU_OT_OBJECT_ARRAY, /* UINT64 */ 76 DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */ 77 DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */ 78 DMU_OT_BPLIST, /* UINT64 */ 79 DMU_OT_BPLIST_HDR, /* UINT64 */ 80 /* spa: */ 81 DMU_OT_SPACE_MAP_HEADER, /* UINT64 */ 82 DMU_OT_SPACE_MAP, /* UINT64 */ 83 /* zil: */ 84 DMU_OT_INTENT_LOG, /* UINT64 */ 85 /* dmu: */ 86 DMU_OT_DNODE, /* DNODE */ 87 DMU_OT_OBJSET, /* OBJSET */ 88 /* dsl: */ 89 DMU_OT_DSL_DIR, /* UINT64 */ 90 DMU_OT_DSL_DIR_CHILD_MAP, /* ZAP */ 91 DMU_OT_DSL_DS_SNAP_MAP, /* ZAP */ 92 DMU_OT_DSL_PROPS, /* ZAP */ 93 DMU_OT_DSL_DATASET, /* UINT64 */ 94 /* zpl: */ 95 DMU_OT_ZNODE, /* ZNODE */ 96 DMU_OT_OLDACL, /* Old ACL */ 97 DMU_OT_PLAIN_FILE_CONTENTS, /* UINT8 */ 98 DMU_OT_DIRECTORY_CONTENTS, /* ZAP */ 99 DMU_OT_MASTER_NODE, /* ZAP */ 100 DMU_OT_UNLINKED_SET, /* ZAP */ 101 /* zvol: */ 102 DMU_OT_ZVOL, /* UINT8 */ 103 DMU_OT_ZVOL_PROP, /* ZAP */ 104 /* other; for testing only! */ 105 DMU_OT_PLAIN_OTHER, /* UINT8 */ 106 DMU_OT_UINT64_OTHER, /* UINT64 */ 107 DMU_OT_ZAP_OTHER, /* ZAP */ 108 /* new object types: */ 109 DMU_OT_ERROR_LOG, /* ZAP */ 110 DMU_OT_SPA_HISTORY, /* UINT8 */ 111 DMU_OT_SPA_HISTORY_OFFSETS, /* spa_his_phys_t */ 112 DMU_OT_POOL_PROPS, /* ZAP */ 113 DMU_OT_DSL_PERMS, /* ZAP */ 114 DMU_OT_ACL, /* ACL */ 115 DMU_OT_SYSACL, /* SYSACL */ 116 DMU_OT_FUID, /* FUID table (Packed NVLIST UINT8) */ 117 DMU_OT_FUID_SIZE, /* FUID table size UINT64 */ 118 DMU_OT_NEXT_CLONES, /* ZAP */ 119 DMU_OT_SCRUB_QUEUE, /* ZAP */ 120 DMU_OT_USERGROUP_USED, /* ZAP */ 121 DMU_OT_USERGROUP_QUOTA, /* ZAP */ 122 DMU_OT_USERREFS, /* ZAP */ 123 DMU_OT_DDT_ZAP, /* ZAP */ 124 DMU_OT_DDT_STATS, /* ZAP */ 125 DMU_OT_SA, /* System attr */ 126 DMU_OT_SA_MASTER_NODE, /* ZAP */ 127 DMU_OT_SA_ATTR_REGISTRATION, /* ZAP */ 128 DMU_OT_SA_ATTR_LAYOUTS, /* ZAP */ 129 DMU_OT_NUMTYPES 130 } dmu_object_type_t; 131 132 typedef enum dmu_objset_type { 133 DMU_OST_NONE, 134 DMU_OST_META, 135 DMU_OST_ZFS, 136 DMU_OST_ZVOL, 137 DMU_OST_OTHER, /* For testing only! */ 138 DMU_OST_ANY, /* Be careful! */ 139 DMU_OST_NUMTYPES 140 } dmu_objset_type_t; 141 142 void byteswap_uint64_array(void *buf, size_t size); 143 void byteswap_uint32_array(void *buf, size_t size); 144 void byteswap_uint16_array(void *buf, size_t size); 145 void byteswap_uint8_array(void *buf, size_t size); 146 void zap_byteswap(void *buf, size_t size); 147 void zfs_oldacl_byteswap(void *buf, size_t size); 148 void zfs_acl_byteswap(void *buf, size_t size); 149 void zfs_znode_byteswap(void *buf, size_t size); 150 151 #define DS_FIND_SNAPSHOTS (1<<0) 152 #define DS_FIND_CHILDREN (1<<1) 153 154 /* 155 * The maximum number of bytes that can be accessed as part of one 156 * operation, including metadata. 157 */ 158 #define DMU_MAX_ACCESS (10<<20) /* 10MB */ 159 #define DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */ 160 161 #define DMU_USERUSED_OBJECT (-1ULL) 162 #define DMU_GROUPUSED_OBJECT (-2ULL) 163 #define DMU_DEADLIST_OBJECT (-3ULL) 164 165 /* 166 * artificial blkids for bonus buffer and spill blocks 167 */ 168 #define DMU_BONUS_BLKID (-1ULL) 169 #define DMU_SPILL_BLKID (-2ULL) 170 /* 171 * Public routines to create, destroy, open, and close objsets. 172 */ 173 int dmu_objset_hold(const char *name, void *tag, objset_t **osp); 174 int dmu_objset_own(const char *name, dmu_objset_type_t type, 175 boolean_t readonly, void *tag, objset_t **osp); 176 void dmu_objset_rele(objset_t *os, void *tag); 177 void dmu_objset_disown(objset_t *os, void *tag); 178 int dmu_objset_open_ds(struct dsl_dataset *ds, objset_t **osp); 179 180 int dmu_objset_evict_dbufs(objset_t *os); 181 int dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, 182 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg); 183 int dmu_objset_clone(const char *name, struct dsl_dataset *clone_origin, 184 uint64_t flags); 185 int dmu_objset_destroy(const char *name, boolean_t defer); 186 int dmu_snapshots_destroy(char *fsname, char *snapname, boolean_t defer); 187 int dmu_objset_snapshot(char *fsname, char *snapname, struct nvlist *props, 188 boolean_t recursive); 189 int dmu_objset_rename(const char *name, const char *newname, 190 boolean_t recursive); 191 int dmu_objset_find(char *name, int func(const char *, void *), void *arg, 192 int flags); 193 void dmu_objset_byteswap(void *buf, size_t size); 194 195 typedef struct dmu_buf { 196 uint64_t db_object; /* object that this buffer is part of */ 197 uint64_t db_offset; /* byte offset in this object */ 198 uint64_t db_size; /* size of buffer in bytes */ 199 void *db_data; /* data in buffer */ 200 } dmu_buf_t; 201 202 typedef void dmu_buf_evict_func_t(struct dmu_buf *db, void *user_ptr); 203 204 /* 205 * The names of zap entries in the DIRECTORY_OBJECT of the MOS. 206 */ 207 #define DMU_POOL_DIRECTORY_OBJECT 1 208 #define DMU_POOL_CONFIG "config" 209 #define DMU_POOL_ROOT_DATASET "root_dataset" 210 #define DMU_POOL_SYNC_BPLIST "sync_bplist" 211 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub" 212 #define DMU_POOL_ERRLOG_LAST "errlog_last" 213 #define DMU_POOL_SPARES "spares" 214 #define DMU_POOL_DEFLATE "deflate" 215 #define DMU_POOL_HISTORY "history" 216 #define DMU_POOL_PROPS "pool_props" 217 #define DMU_POOL_L2CACHE "l2cache" 218 #define DMU_POOL_TMP_USERREFS "tmp_userrefs" 219 #define DMU_POOL_DDT "DDT-%s-%s-%s" 220 #define DMU_POOL_DDT_STATS "DDT-statistics" 221 222 /* 4x8 zbookmark_t */ 223 #define DMU_POOL_SCRUB_BOOKMARK "scrub_bookmark" 224 /* 4x8 ddt_bookmark_t */ 225 #define DMU_POOL_SCRUB_DDT_BOOKMARK "scrub_ddt_bookmark" 226 /* 1x8 max_class */ 227 #define DMU_POOL_SCRUB_DDT_CLASS_MAX "scrub_ddt_class_max" 228 /* 1x8 zap obj DMU_OT_SCRUB_QUEUE */ 229 #define DMU_POOL_SCRUB_QUEUE "scrub_queue" 230 /* 1x8 txg */ 231 #define DMU_POOL_SCRUB_MIN_TXG "scrub_min_txg" 232 /* 1x8 txg */ 233 #define DMU_POOL_SCRUB_MAX_TXG "scrub_max_txg" 234 /* 1x4 enum scrub_func */ 235 #define DMU_POOL_SCRUB_FUNC "scrub_func" 236 /* 1x8 count */ 237 #define DMU_POOL_SCRUB_ERRORS "scrub_errors" 238 239 /* 240 * Allocate an object from this objset. The range of object numbers 241 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode. 242 * 243 * The transaction must be assigned to a txg. The newly allocated 244 * object will be "held" in the transaction (ie. you can modify the 245 * newly allocated object in this transaction). 246 * 247 * dmu_object_alloc() chooses an object and returns it in *objectp. 248 * 249 * dmu_object_claim() allocates a specific object number. If that 250 * number is already allocated, it fails and returns EEXIST. 251 * 252 * Return 0 on success, or ENOSPC or EEXIST as specified above. 253 */ 254 uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot, 255 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 256 int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 257 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 258 int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 259 int blocksize, dmu_object_type_t bonustype, int bonuslen); 260 261 /* 262 * Free an object from this objset. 263 * 264 * The object's data will be freed as well (ie. you don't need to call 265 * dmu_free(object, 0, -1, tx)). 266 * 267 * The object need not be held in the transaction. 268 * 269 * If there are any holds on this object's buffers (via dmu_buf_hold()), 270 * or tx holds on the object (via dmu_tx_hold_object()), you can not 271 * free it; it fails and returns EBUSY. 272 * 273 * If the object is not allocated, it fails and returns ENOENT. 274 * 275 * Return 0 on success, or EBUSY or ENOENT as specified above. 276 */ 277 int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx); 278 279 /* 280 * Find the next allocated or free object. 281 * 282 * The objectp parameter is in-out. It will be updated to be the next 283 * object which is allocated. Ignore objects which have not been 284 * modified since txg. 285 * 286 * XXX Can only be called on a objset with no dirty data. 287 * 288 * Returns 0 on success, or ENOENT if there are no more objects. 289 */ 290 int dmu_object_next(objset_t *os, uint64_t *objectp, 291 boolean_t hole, uint64_t txg); 292 293 /* 294 * Set the data blocksize for an object. 295 * 296 * The object cannot have any blocks allcated beyond the first. If 297 * the first block is allocated already, the new size must be greater 298 * than the current block size. If these conditions are not met, 299 * ENOTSUP will be returned. 300 * 301 * Returns 0 on success, or EBUSY if there are any holds on the object 302 * contents, or ENOTSUP as described above. 303 */ 304 int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, 305 int ibs, dmu_tx_t *tx); 306 307 /* 308 * Set the checksum property on a dnode. The new checksum algorithm will 309 * apply to all newly written blocks; existing blocks will not be affected. 310 */ 311 void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum, 312 dmu_tx_t *tx); 313 314 /* 315 * Set the compress property on a dnode. The new compression algorithm will 316 * apply to all newly written blocks; existing blocks will not be affected. 317 */ 318 void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress, 319 dmu_tx_t *tx); 320 321 /* 322 * Decide how to write a block: checksum, compression, number of copies, etc. 323 */ 324 #define WP_NOFILL 0x1 325 #define WP_DMU_SYNC 0x2 326 #define WP_SPILL 0x4 327 328 void dmu_write_policy(objset_t *os, struct dnode *dn, int level, int wp, 329 struct zio_prop *zp); 330 /* 331 * The bonus data is accessed more or less like a regular buffer. 332 * You must dmu_bonus_hold() to get the buffer, which will give you a 333 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus 334 * data. As with any normal buffer, you must call dmu_buf_read() to 335 * read db_data, dmu_buf_will_dirty() before modifying it, and the 336 * object must be held in an assigned transaction before calling 337 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus 338 * buffer as well. You must release your hold with dmu_buf_rele(). 339 */ 340 int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **); 341 int dmu_bonus_max(void); 342 int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *); 343 int dmu_set_bonustype(dmu_buf_t *, dmu_object_type_t, dmu_tx_t *); 344 int dmu_rm_spill(objset_t *, uint64_t, dmu_tx_t *); 345 346 /* 347 * Special spill buffer support used by "SA" framework 348 */ 349 350 int dmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp); 351 int dmu_spill_hold_by_dnode(struct dnode *dn, uint32_t flags, 352 void *tag, dmu_buf_t **dbp); 353 int dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp); 354 355 /* 356 * Obtain the DMU buffer from the specified object which contains the 357 * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so 358 * that it will remain in memory. You must release the hold with 359 * dmu_buf_rele(). You musn't access the dmu_buf_t after releasing your 360 * hold. You must have a hold on any dmu_buf_t* you pass to the DMU. 361 * 362 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill 363 * on the returned buffer before reading or writing the buffer's 364 * db_data. The comments for those routines describe what particular 365 * operations are valid after calling them. 366 * 367 * The object number must be a valid, allocated object number. 368 */ 369 int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset, 370 void *tag, dmu_buf_t **); 371 void dmu_buf_add_ref(dmu_buf_t *db, void* tag); 372 void dmu_buf_rele(dmu_buf_t *db, void *tag); 373 uint64_t dmu_buf_refcount(dmu_buf_t *db); 374 375 /* 376 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a 377 * range of an object. A pointer to an array of dmu_buf_t*'s is 378 * returned (in *dbpp). 379 * 380 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and 381 * frees the array. The hold on the array of buffers MUST be released 382 * with dmu_buf_rele_array. You can NOT release the hold on each buffer 383 * individually with dmu_buf_rele. 384 */ 385 int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset, 386 uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp); 387 void dmu_buf_rele_array(dmu_buf_t **, int numbufs, void *tag); 388 389 /* 390 * Returns NULL on success, or the existing user ptr if it's already 391 * been set. 392 * 393 * user_ptr is for use by the user and can be obtained via dmu_buf_get_user(). 394 * 395 * user_data_ptr_ptr should be NULL, or a pointer to a pointer which 396 * will be set to db->db_data when you are allowed to access it. Note 397 * that db->db_data (the pointer) can change when you do dmu_buf_read(), 398 * dmu_buf_tryupgrade(), dmu_buf_will_dirty(), or dmu_buf_will_fill(). 399 * *user_data_ptr_ptr will be set to the new value when it changes. 400 * 401 * If non-NULL, pageout func will be called when this buffer is being 402 * excised from the cache, so that you can clean up the data structure 403 * pointed to by user_ptr. 404 * 405 * dmu_evict_user() will call the pageout func for all buffers in a 406 * objset with a given pageout func. 407 */ 408 void *dmu_buf_set_user(dmu_buf_t *db, void *user_ptr, void *user_data_ptr_ptr, 409 dmu_buf_evict_func_t *pageout_func); 410 /* 411 * set_user_ie is the same as set_user, but request immediate eviction 412 * when hold count goes to zero. 413 */ 414 void *dmu_buf_set_user_ie(dmu_buf_t *db, void *user_ptr, 415 void *user_data_ptr_ptr, dmu_buf_evict_func_t *pageout_func); 416 void *dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, 417 void *user_ptr, void *user_data_ptr_ptr, 418 dmu_buf_evict_func_t *pageout_func); 419 void dmu_evict_user(objset_t *os, dmu_buf_evict_func_t *func); 420 421 /* 422 * Returns the user_ptr set with dmu_buf_set_user(), or NULL if not set. 423 */ 424 void *dmu_buf_get_user(dmu_buf_t *db); 425 426 /* 427 * Indicate that you are going to modify the buffer's data (db_data). 428 * 429 * The transaction (tx) must be assigned to a txg (ie. you've called 430 * dmu_tx_assign()). The buffer's object must be held in the tx 431 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)). 432 */ 433 void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx); 434 435 /* 436 * Tells if the given dbuf is freeable. 437 */ 438 boolean_t dmu_buf_freeable(dmu_buf_t *); 439 440 /* 441 * You must create a transaction, then hold the objects which you will 442 * (or might) modify as part of this transaction. Then you must assign 443 * the transaction to a transaction group. Once the transaction has 444 * been assigned, you can modify buffers which belong to held objects as 445 * part of this transaction. You can't modify buffers before the 446 * transaction has been assigned; you can't modify buffers which don't 447 * belong to objects which this transaction holds; you can't hold 448 * objects once the transaction has been assigned. You may hold an 449 * object which you are going to free (with dmu_object_free()), but you 450 * don't have to. 451 * 452 * You can abort the transaction before it has been assigned. 453 * 454 * Note that you may hold buffers (with dmu_buf_hold) at any time, 455 * regardless of transaction state. 456 */ 457 458 #define DMU_NEW_OBJECT (-1ULL) 459 #define DMU_OBJECT_END (-1ULL) 460 461 dmu_tx_t *dmu_tx_create(objset_t *os); 462 void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len); 463 void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off, 464 uint64_t len); 465 void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, const char *name); 466 void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object); 467 void dmu_tx_hold_spill(dmu_tx_t *tx, uint64_t object); 468 void dmu_tx_hold_sa(dmu_tx_t *tx, struct sa_handle *hdl, boolean_t may_grow); 469 void dmu_tx_hold_sa_create(dmu_tx_t *tx, int total_size); 470 void dmu_tx_abort(dmu_tx_t *tx); 471 int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how); 472 void dmu_tx_wait(dmu_tx_t *tx); 473 void dmu_tx_commit(dmu_tx_t *tx); 474 475 /* 476 * To register a commit callback, dmu_tx_callback_register() must be called. 477 * 478 * dcb_data is a pointer to caller private data that is passed on as a 479 * callback parameter. The caller is responsible for properly allocating and 480 * freeing it. 481 * 482 * When registering a callback, the transaction must be already created, but 483 * it cannot be committed or aborted. It can be assigned to a txg or not. 484 * 485 * The callback will be called after the transaction has been safely written 486 * to stable storage and will also be called if the dmu_tx is aborted. 487 * If there is any error which prevents the transaction from being committed to 488 * disk, the callback will be called with a value of error != 0. 489 */ 490 typedef void dmu_tx_callback_func_t(void *dcb_data, int error); 491 492 void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func, 493 void *dcb_data); 494 495 /* 496 * Free up the data blocks for a defined range of a file. If size is 497 * zero, the range from offset to end-of-file is freed. 498 */ 499 int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset, 500 uint64_t size, dmu_tx_t *tx); 501 int dmu_free_long_range(objset_t *os, uint64_t object, uint64_t offset, 502 uint64_t size); 503 int dmu_free_object(objset_t *os, uint64_t object); 504 505 /* 506 * Convenience functions. 507 * 508 * Canfail routines will return 0 on success, or an errno if there is a 509 * nonrecoverable I/O error. 510 */ 511 #define DMU_READ_PREFETCH 0 /* prefetch */ 512 #define DMU_READ_NO_PREFETCH 1 /* don't prefetch */ 513 int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 514 void *buf, uint32_t flags); 515 void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 516 const void *buf, dmu_tx_t *tx); 517 void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 518 dmu_tx_t *tx); 519 int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size); 520 int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size, 521 dmu_tx_t *tx); 522 int dmu_write_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size, 523 dmu_tx_t *tx); 524 int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, 525 uint64_t size, struct page *pp, dmu_tx_t *tx); 526 struct arc_buf *dmu_request_arcbuf(dmu_buf_t *handle, int size); 527 void dmu_return_arcbuf(struct arc_buf *buf); 528 void dmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, struct arc_buf *buf, 529 dmu_tx_t *tx); 530 int dmu_xuio_init(struct xuio *uio, int niov); 531 void dmu_xuio_fini(struct xuio *uio); 532 int dmu_xuio_add(struct xuio *uio, struct arc_buf *abuf, offset_t off, 533 size_t n); 534 int dmu_xuio_cnt(struct xuio *uio); 535 struct arc_buf *dmu_xuio_arcbuf(struct xuio *uio, int i); 536 void dmu_xuio_clear(struct xuio *uio, int i); 537 void xuio_stat_wbuf_copied(); 538 void xuio_stat_wbuf_nocopy(); 539 540 extern int zfs_prefetch_disable; 541 542 /* 543 * Asynchronously try to read in the data. 544 */ 545 void dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, 546 uint64_t len); 547 548 typedef struct dmu_object_info { 549 /* All sizes are in bytes unless otherwise indicated. */ 550 uint32_t doi_data_block_size; 551 uint32_t doi_metadata_block_size; 552 dmu_object_type_t doi_type; 553 dmu_object_type_t doi_bonus_type; 554 uint64_t doi_bonus_size; 555 uint8_t doi_indirection; /* 2 = dnode->indirect->data */ 556 uint8_t doi_checksum; 557 uint8_t doi_compress; 558 uint8_t doi_pad[5]; 559 uint64_t doi_physical_blocks_512; /* data + metadata, 512b blks */ 560 uint64_t doi_max_offset; 561 uint64_t doi_fill_count; /* number of non-empty blocks */ 562 } dmu_object_info_t; 563 564 typedef void arc_byteswap_func_t(void *buf, size_t size); 565 566 typedef struct dmu_object_type_info { 567 arc_byteswap_func_t *ot_byteswap; 568 boolean_t ot_metadata; 569 char *ot_name; 570 } dmu_object_type_info_t; 571 572 extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES]; 573 574 /* 575 * Get information on a DMU object. 576 * 577 * Return 0 on success or ENOENT if object is not allocated. 578 * 579 * If doi is NULL, just indicates whether the object exists. 580 */ 581 int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi); 582 void dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi); 583 void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi); 584 void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize, 585 u_longlong_t *nblk512); 586 587 typedef struct dmu_objset_stats { 588 uint64_t dds_num_clones; /* number of clones of this */ 589 uint64_t dds_creation_txg; 590 uint64_t dds_guid; 591 dmu_objset_type_t dds_type; 592 uint8_t dds_is_snapshot; 593 uint8_t dds_inconsistent; 594 char dds_origin[MAXNAMELEN]; 595 } dmu_objset_stats_t; 596 597 /* 598 * Get stats on a dataset. 599 */ 600 void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat); 601 602 /* 603 * Add entries to the nvlist for all the objset's properties. See 604 * zfs_prop_table[] and zfs(1m) for details on the properties. 605 */ 606 void dmu_objset_stats(objset_t *os, struct nvlist *nv); 607 608 /* 609 * Get the space usage statistics for statvfs(). 610 * 611 * refdbytes is the amount of space "referenced" by this objset. 612 * availbytes is the amount of space available to this objset, taking 613 * into account quotas & reservations, assuming that no other objsets 614 * use the space first. These values correspond to the 'referenced' and 615 * 'available' properties, described in the zfs(1m) manpage. 616 * 617 * usedobjs and availobjs are the number of objects currently allocated, 618 * and available. 619 */ 620 void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 621 uint64_t *usedobjsp, uint64_t *availobjsp); 622 623 /* 624 * The fsid_guid is a 56-bit ID that can change to avoid collisions. 625 * (Contrast with the ds_guid which is a 64-bit ID that will never 626 * change, so there is a small probability that it will collide.) 627 */ 628 uint64_t dmu_objset_fsid_guid(objset_t *os); 629 630 /* 631 * Get the [cm]time for an objset's snapshot dir 632 */ 633 timestruc_t dmu_objset_snap_cmtime(objset_t *os); 634 635 int dmu_objset_is_snapshot(objset_t *os); 636 637 extern struct spa *dmu_objset_spa(objset_t *os); 638 extern struct zilog *dmu_objset_zil(objset_t *os); 639 extern struct dsl_pool *dmu_objset_pool(objset_t *os); 640 extern struct dsl_dataset *dmu_objset_ds(objset_t *os); 641 extern void dmu_objset_name(objset_t *os, char *buf); 642 extern dmu_objset_type_t dmu_objset_type(objset_t *os); 643 extern uint64_t dmu_objset_id(objset_t *os); 644 extern uint64_t dmu_objset_logbias(objset_t *os); 645 extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 646 uint64_t *id, uint64_t *offp, boolean_t *case_conflict); 647 extern int dmu_snapshot_realname(objset_t *os, char *name, char *real, 648 int maxlen, boolean_t *conflict); 649 extern int dmu_dir_list_next(objset_t *os, int namelen, char *name, 650 uint64_t *idp, uint64_t *offp); 651 652 typedef int objset_used_cb_t(dmu_object_type_t bonustype, 653 void *bonus, uint64_t *userp, uint64_t *groupp); 654 extern void dmu_objset_register_type(dmu_objset_type_t ost, 655 objset_used_cb_t *cb); 656 extern void dmu_objset_set_user(objset_t *os, void *user_ptr); 657 extern void *dmu_objset_get_user(objset_t *os); 658 659 /* 660 * Return the txg number for the given assigned transaction. 661 */ 662 uint64_t dmu_tx_get_txg(dmu_tx_t *tx); 663 664 /* 665 * Synchronous write. 666 * If a parent zio is provided this function initiates a write on the 667 * provided buffer as a child of the parent zio. 668 * In the absence of a parent zio, the write is completed synchronously. 669 * At write completion, blk is filled with the bp of the written block. 670 * Note that while the data covered by this function will be on stable 671 * storage when the write completes this new data does not become a 672 * permanent part of the file until the associated transaction commits. 673 */ 674 675 /* 676 * {zfs,zvol,ztest}_get_done() args 677 */ 678 typedef struct zgd { 679 struct zilog *zgd_zilog; 680 struct blkptr *zgd_bp; 681 dmu_buf_t *zgd_db; 682 struct rl *zgd_rl; 683 void *zgd_private; 684 } zgd_t; 685 686 typedef void dmu_sync_cb_t(zgd_t *arg, int error); 687 int dmu_sync(struct zio *zio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd); 688 689 /* 690 * Find the next hole or data block in file starting at *off 691 * Return found offset in *off. Return ESRCH for end of file. 692 */ 693 int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, 694 uint64_t *off); 695 696 /* 697 * Initial setup and final teardown. 698 */ 699 extern void dmu_init(void); 700 extern void dmu_fini(void); 701 702 typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp, 703 uint64_t object, uint64_t offset, int len); 704 void dmu_traverse_objset(objset_t *os, uint64_t txg_start, 705 dmu_traverse_cb_t cb, void *arg); 706 707 int dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin, 708 struct vnode *vp, offset_t *off); 709 710 typedef struct dmu_recv_cookie { 711 /* 712 * This structure is opaque! 713 * 714 * If logical and real are different, we are recving the stream 715 * into the "real" temporary clone, and then switching it with 716 * the "logical" target. 717 */ 718 struct dsl_dataset *drc_logical_ds; 719 struct dsl_dataset *drc_real_ds; 720 struct drr_begin *drc_drrb; 721 char *drc_tosnap; 722 char *drc_top_ds; 723 boolean_t drc_newfs; 724 boolean_t drc_force; 725 } dmu_recv_cookie_t; 726 727 int dmu_recv_begin(char *tofs, char *tosnap, char *topds, struct drr_begin *, 728 boolean_t force, objset_t *origin, dmu_recv_cookie_t *); 729 int dmu_recv_stream(dmu_recv_cookie_t *drc, struct vnode *vp, offset_t *voffp); 730 int dmu_recv_end(dmu_recv_cookie_t *drc); 731 732 /* CRC64 table */ 733 #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */ 734 extern uint64_t zfs_crc64_table[256]; 735 736 #ifdef __cplusplus 737 } 738 #endif 739 740 #endif /* _SYS_DMU_H */ 741