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 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_DMU_H 27 #define _SYS_DMU_H 28 29 /* 30 * This file describes the interface that the DMU provides for its 31 * consumers. 32 * 33 * The DMU also interacts with the SPA. That interface is described in 34 * dmu_spa.h. 35 */ 36 37 #include <sys/inttypes.h> 38 #include <sys/types.h> 39 #include <sys/param.h> 40 #include <sys/cred.h> 41 42 #ifdef __cplusplus 43 extern "C" { 44 #endif 45 46 struct uio; 47 struct page; 48 struct vnode; 49 struct spa; 50 struct zilog; 51 struct zio; 52 struct blkptr; 53 struct zap_cursor; 54 struct dsl_dataset; 55 struct dsl_pool; 56 struct dnode; 57 struct drr_begin; 58 struct drr_end; 59 struct zbookmark; 60 struct spa; 61 struct nvlist; 62 struct objset_impl; 63 struct arc_buf; 64 65 typedef struct objset objset_t; 66 typedef struct dmu_tx dmu_tx_t; 67 typedef struct dsl_dir dsl_dir_t; 68 69 typedef enum dmu_object_type { 70 DMU_OT_NONE, 71 /* general: */ 72 DMU_OT_OBJECT_DIRECTORY, /* ZAP */ 73 DMU_OT_OBJECT_ARRAY, /* UINT64 */ 74 DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */ 75 DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */ 76 DMU_OT_BPLIST, /* UINT64 */ 77 DMU_OT_BPLIST_HDR, /* UINT64 */ 78 /* spa: */ 79 DMU_OT_SPACE_MAP_HEADER, /* UINT64 */ 80 DMU_OT_SPACE_MAP, /* UINT64 */ 81 /* zil: */ 82 DMU_OT_INTENT_LOG, /* UINT64 */ 83 /* dmu: */ 84 DMU_OT_DNODE, /* DNODE */ 85 DMU_OT_OBJSET, /* OBJSET */ 86 /* dsl: */ 87 DMU_OT_DSL_DIR, /* UINT64 */ 88 DMU_OT_DSL_DIR_CHILD_MAP, /* ZAP */ 89 DMU_OT_DSL_DS_SNAP_MAP, /* ZAP */ 90 DMU_OT_DSL_PROPS, /* ZAP */ 91 DMU_OT_DSL_DATASET, /* UINT64 */ 92 /* zpl: */ 93 DMU_OT_ZNODE, /* ZNODE */ 94 DMU_OT_OLDACL, /* Old ACL */ 95 DMU_OT_PLAIN_FILE_CONTENTS, /* UINT8 */ 96 DMU_OT_DIRECTORY_CONTENTS, /* ZAP */ 97 DMU_OT_MASTER_NODE, /* ZAP */ 98 DMU_OT_UNLINKED_SET, /* ZAP */ 99 /* zvol: */ 100 DMU_OT_ZVOL, /* UINT8 */ 101 DMU_OT_ZVOL_PROP, /* ZAP */ 102 /* other; for testing only! */ 103 DMU_OT_PLAIN_OTHER, /* UINT8 */ 104 DMU_OT_UINT64_OTHER, /* UINT64 */ 105 DMU_OT_ZAP_OTHER, /* ZAP */ 106 /* new object types: */ 107 DMU_OT_ERROR_LOG, /* ZAP */ 108 DMU_OT_SPA_HISTORY, /* UINT8 */ 109 DMU_OT_SPA_HISTORY_OFFSETS, /* spa_his_phys_t */ 110 DMU_OT_POOL_PROPS, /* ZAP */ 111 DMU_OT_DSL_PERMS, /* ZAP */ 112 DMU_OT_ACL, /* ACL */ 113 DMU_OT_SYSACL, /* SYSACL */ 114 DMU_OT_FUID, /* FUID table (Packed NVLIST UINT8) */ 115 DMU_OT_FUID_SIZE, /* FUID table size UINT64 */ 116 DMU_OT_NEXT_CLONES, /* ZAP */ 117 DMU_OT_SCRUB_QUEUE, /* ZAP */ 118 DMU_OT_USERGROUP_USED, /* ZAP */ 119 DMU_OT_USERGROUP_QUOTA, /* ZAP */ 120 DMU_OT_NUMTYPES 121 } dmu_object_type_t; 122 123 typedef enum dmu_objset_type { 124 DMU_OST_NONE, 125 DMU_OST_META, 126 DMU_OST_ZFS, 127 DMU_OST_ZVOL, 128 DMU_OST_OTHER, /* For testing only! */ 129 DMU_OST_ANY, /* Be careful! */ 130 DMU_OST_NUMTYPES 131 } dmu_objset_type_t; 132 133 void byteswap_uint64_array(void *buf, size_t size); 134 void byteswap_uint32_array(void *buf, size_t size); 135 void byteswap_uint16_array(void *buf, size_t size); 136 void byteswap_uint8_array(void *buf, size_t size); 137 void zap_byteswap(void *buf, size_t size); 138 void zfs_oldacl_byteswap(void *buf, size_t size); 139 void zfs_acl_byteswap(void *buf, size_t size); 140 void zfs_znode_byteswap(void *buf, size_t size); 141 142 #define DS_MODE_NOHOLD 0 /* internal use only */ 143 #define DS_MODE_USER 1 /* simple access, no special needs */ 144 #define DS_MODE_OWNER 2 /* the "main" access, e.g. a mount */ 145 #define DS_MODE_TYPE_MASK 0x3 146 #define DS_MODE_TYPE(x) ((x) & DS_MODE_TYPE_MASK) 147 #define DS_MODE_READONLY 0x8 148 #define DS_MODE_IS_READONLY(x) ((x) & DS_MODE_READONLY) 149 #define DS_MODE_INCONSISTENT 0x10 150 #define DS_MODE_IS_INCONSISTENT(x) ((x) & DS_MODE_INCONSISTENT) 151 152 #define DS_FIND_SNAPSHOTS (1<<0) 153 #define DS_FIND_CHILDREN (1<<1) 154 155 /* 156 * The maximum number of bytes that can be accessed as part of one 157 * operation, including metadata. 158 */ 159 #define DMU_MAX_ACCESS (10<<20) /* 10MB */ 160 #define DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */ 161 162 #define DMU_USERUSED_OBJECT (-1ULL) 163 #define DMU_GROUPUSED_OBJECT (-2ULL) 164 165 /* 166 * Public routines to create, destroy, open, and close objsets. 167 */ 168 int dmu_objset_open(const char *name, dmu_objset_type_t type, int mode, 169 objset_t **osp); 170 int dmu_objset_open_ds(struct dsl_dataset *ds, dmu_objset_type_t type, 171 objset_t **osp); 172 void dmu_objset_close(objset_t *os); 173 int dmu_objset_evict_dbufs(objset_t *os); 174 int dmu_objset_create(const char *name, dmu_objset_type_t type, 175 objset_t *clone_parent, uint64_t flags, 176 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg); 177 int dmu_objset_destroy(const char *name); 178 int dmu_snapshots_destroy(char *fsname, char *snapname); 179 int dmu_objset_rollback(objset_t *os); 180 int dmu_objset_snapshot(char *fsname, char *snapname, struct nvlist *props, 181 boolean_t recursive); 182 int dmu_objset_rename(const char *name, const char *newname, 183 boolean_t recursive); 184 int dmu_objset_find(char *name, int func(char *, void *), void *arg, 185 int flags); 186 void dmu_objset_byteswap(void *buf, size_t size); 187 188 typedef struct dmu_buf { 189 uint64_t db_object; /* object that this buffer is part of */ 190 uint64_t db_offset; /* byte offset in this object */ 191 uint64_t db_size; /* size of buffer in bytes */ 192 void *db_data; /* data in buffer */ 193 } dmu_buf_t; 194 195 typedef void dmu_buf_evict_func_t(struct dmu_buf *db, void *user_ptr); 196 197 /* 198 * The names of zap entries in the DIRECTORY_OBJECT of the MOS. 199 */ 200 #define DMU_POOL_DIRECTORY_OBJECT 1 201 #define DMU_POOL_CONFIG "config" 202 #define DMU_POOL_ROOT_DATASET "root_dataset" 203 #define DMU_POOL_SYNC_BPLIST "sync_bplist" 204 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub" 205 #define DMU_POOL_ERRLOG_LAST "errlog_last" 206 #define DMU_POOL_SPARES "spares" 207 #define DMU_POOL_DEFLATE "deflate" 208 #define DMU_POOL_HISTORY "history" 209 #define DMU_POOL_PROPS "pool_props" 210 #define DMU_POOL_L2CACHE "l2cache" 211 212 /* 4x8 zbookmark_t */ 213 #define DMU_POOL_SCRUB_BOOKMARK "scrub_bookmark" 214 /* 1x8 zap obj DMU_OT_SCRUB_QUEUE */ 215 #define DMU_POOL_SCRUB_QUEUE "scrub_queue" 216 /* 1x8 txg */ 217 #define DMU_POOL_SCRUB_MIN_TXG "scrub_min_txg" 218 /* 1x8 txg */ 219 #define DMU_POOL_SCRUB_MAX_TXG "scrub_max_txg" 220 /* 1x4 enum scrub_func */ 221 #define DMU_POOL_SCRUB_FUNC "scrub_func" 222 /* 1x8 count */ 223 #define DMU_POOL_SCRUB_ERRORS "scrub_errors" 224 225 /* 226 * Allocate an object from this objset. The range of object numbers 227 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode. 228 * 229 * The transaction must be assigned to a txg. The newly allocated 230 * object will be "held" in the transaction (ie. you can modify the 231 * newly allocated object in this transaction). 232 * 233 * dmu_object_alloc() chooses an object and returns it in *objectp. 234 * 235 * dmu_object_claim() allocates a specific object number. If that 236 * number is already allocated, it fails and returns EEXIST. 237 * 238 * Return 0 on success, or ENOSPC or EEXIST as specified above. 239 */ 240 uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot, 241 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 242 int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 243 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 244 int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 245 int blocksize, dmu_object_type_t bonustype, int bonuslen); 246 247 /* 248 * Free an object from this objset. 249 * 250 * The object's data will be freed as well (ie. you don't need to call 251 * dmu_free(object, 0, -1, tx)). 252 * 253 * The object need not be held in the transaction. 254 * 255 * If there are any holds on this object's buffers (via dmu_buf_hold()), 256 * or tx holds on the object (via dmu_tx_hold_object()), you can not 257 * free it; it fails and returns EBUSY. 258 * 259 * If the object is not allocated, it fails and returns ENOENT. 260 * 261 * Return 0 on success, or EBUSY or ENOENT as specified above. 262 */ 263 int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx); 264 265 /* 266 * Find the next allocated or free object. 267 * 268 * The objectp parameter is in-out. It will be updated to be the next 269 * object which is allocated. Ignore objects which have not been 270 * modified since txg. 271 * 272 * XXX Can only be called on a objset with no dirty data. 273 * 274 * Returns 0 on success, or ENOENT if there are no more objects. 275 */ 276 int dmu_object_next(objset_t *os, uint64_t *objectp, 277 boolean_t hole, uint64_t txg); 278 279 /* 280 * Set the data blocksize for an object. 281 * 282 * The object cannot have any blocks allcated beyond the first. If 283 * the first block is allocated already, the new size must be greater 284 * than the current block size. If these conditions are not met, 285 * ENOTSUP will be returned. 286 * 287 * Returns 0 on success, or EBUSY if there are any holds on the object 288 * contents, or ENOTSUP as described above. 289 */ 290 int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, 291 int ibs, dmu_tx_t *tx); 292 293 /* 294 * Set the checksum property on a dnode. The new checksum algorithm will 295 * apply to all newly written blocks; existing blocks will not be affected. 296 */ 297 void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum, 298 dmu_tx_t *tx); 299 300 /* 301 * Set the compress property on a dnode. The new compression algorithm will 302 * apply to all newly written blocks; existing blocks will not be affected. 303 */ 304 void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress, 305 dmu_tx_t *tx); 306 307 /* 308 * Decide how many copies of a given block we should make. Can be from 309 * 1 to SPA_DVAS_PER_BP. 310 */ 311 int dmu_get_replication_level(struct objset_impl *, struct zbookmark *zb, 312 dmu_object_type_t ot); 313 /* 314 * The bonus data is accessed more or less like a regular buffer. 315 * You must dmu_bonus_hold() to get the buffer, which will give you a 316 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus 317 * data. As with any normal buffer, you must call dmu_buf_read() to 318 * read db_data, dmu_buf_will_dirty() before modifying it, and the 319 * object must be held in an assigned transaction before calling 320 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus 321 * buffer as well. You must release your hold with dmu_buf_rele(). 322 */ 323 int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **); 324 int dmu_bonus_max(void); 325 int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *); 326 327 /* 328 * Obtain the DMU buffer from the specified object which contains the 329 * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so 330 * that it will remain in memory. You must release the hold with 331 * dmu_buf_rele(). You musn't access the dmu_buf_t after releasing your 332 * hold. You must have a hold on any dmu_buf_t* you pass to the DMU. 333 * 334 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill 335 * on the returned buffer before reading or writing the buffer's 336 * db_data. The comments for those routines describe what particular 337 * operations are valid after calling them. 338 * 339 * The object number must be a valid, allocated object number. 340 */ 341 int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset, 342 void *tag, dmu_buf_t **); 343 void dmu_buf_add_ref(dmu_buf_t *db, void* tag); 344 void dmu_buf_rele(dmu_buf_t *db, void *tag); 345 uint64_t dmu_buf_refcount(dmu_buf_t *db); 346 347 /* 348 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a 349 * range of an object. A pointer to an array of dmu_buf_t*'s is 350 * returned (in *dbpp). 351 * 352 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and 353 * frees the array. The hold on the array of buffers MUST be released 354 * with dmu_buf_rele_array. You can NOT release the hold on each buffer 355 * individually with dmu_buf_rele. 356 */ 357 int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset, 358 uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp); 359 void dmu_buf_rele_array(dmu_buf_t **, int numbufs, void *tag); 360 361 /* 362 * Returns NULL on success, or the existing user ptr if it's already 363 * been set. 364 * 365 * user_ptr is for use by the user and can be obtained via dmu_buf_get_user(). 366 * 367 * user_data_ptr_ptr should be NULL, or a pointer to a pointer which 368 * will be set to db->db_data when you are allowed to access it. Note 369 * that db->db_data (the pointer) can change when you do dmu_buf_read(), 370 * dmu_buf_tryupgrade(), dmu_buf_will_dirty(), or dmu_buf_will_fill(). 371 * *user_data_ptr_ptr will be set to the new value when it changes. 372 * 373 * If non-NULL, pageout func will be called when this buffer is being 374 * excised from the cache, so that you can clean up the data structure 375 * pointed to by user_ptr. 376 * 377 * dmu_evict_user() will call the pageout func for all buffers in a 378 * objset with a given pageout func. 379 */ 380 void *dmu_buf_set_user(dmu_buf_t *db, void *user_ptr, void *user_data_ptr_ptr, 381 dmu_buf_evict_func_t *pageout_func); 382 /* 383 * set_user_ie is the same as set_user, but request immediate eviction 384 * when hold count goes to zero. 385 */ 386 void *dmu_buf_set_user_ie(dmu_buf_t *db, void *user_ptr, 387 void *user_data_ptr_ptr, dmu_buf_evict_func_t *pageout_func); 388 void *dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, 389 void *user_ptr, void *user_data_ptr_ptr, 390 dmu_buf_evict_func_t *pageout_func); 391 void dmu_evict_user(objset_t *os, dmu_buf_evict_func_t *func); 392 393 /* 394 * Returns the user_ptr set with dmu_buf_set_user(), or NULL if not set. 395 */ 396 void *dmu_buf_get_user(dmu_buf_t *db); 397 398 /* 399 * Indicate that you are going to modify the buffer's data (db_data). 400 * 401 * The transaction (tx) must be assigned to a txg (ie. you've called 402 * dmu_tx_assign()). The buffer's object must be held in the tx 403 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)). 404 */ 405 void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx); 406 407 /* 408 * Tells if the given dbuf is freeable. 409 */ 410 boolean_t dmu_buf_freeable(dmu_buf_t *); 411 412 /* 413 * You must create a transaction, then hold the objects which you will 414 * (or might) modify as part of this transaction. Then you must assign 415 * the transaction to a transaction group. Once the transaction has 416 * been assigned, you can modify buffers which belong to held objects as 417 * part of this transaction. You can't modify buffers before the 418 * transaction has been assigned; you can't modify buffers which don't 419 * belong to objects which this transaction holds; you can't hold 420 * objects once the transaction has been assigned. You may hold an 421 * object which you are going to free (with dmu_object_free()), but you 422 * don't have to. 423 * 424 * You can abort the transaction before it has been assigned. 425 * 426 * Note that you may hold buffers (with dmu_buf_hold) at any time, 427 * regardless of transaction state. 428 */ 429 430 #define DMU_NEW_OBJECT (-1ULL) 431 #define DMU_OBJECT_END (-1ULL) 432 433 dmu_tx_t *dmu_tx_create(objset_t *os); 434 void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len); 435 void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off, 436 uint64_t len); 437 void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, const char *name); 438 void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object); 439 void dmu_tx_abort(dmu_tx_t *tx); 440 int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how); 441 void dmu_tx_wait(dmu_tx_t *tx); 442 void dmu_tx_commit(dmu_tx_t *tx); 443 444 /* 445 * Free up the data blocks for a defined range of a file. If size is 446 * zero, the range from offset to end-of-file is freed. 447 */ 448 int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset, 449 uint64_t size, dmu_tx_t *tx); 450 int dmu_free_long_range(objset_t *os, uint64_t object, uint64_t offset, 451 uint64_t size); 452 int dmu_free_object(objset_t *os, uint64_t object); 453 454 /* 455 * Convenience functions. 456 * 457 * Canfail routines will return 0 on success, or an errno if there is a 458 * nonrecoverable I/O error. 459 */ 460 #define DMU_READ_PREFETCH 0 /* prefetch */ 461 #define DMU_READ_NO_PREFETCH 1 /* don't prefetch */ 462 int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 463 void *buf, uint32_t flags); 464 void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 465 const void *buf, dmu_tx_t *tx); 466 void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 467 dmu_tx_t *tx); 468 int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size); 469 int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size, 470 dmu_tx_t *tx); 471 int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, 472 uint64_t size, struct page *pp, dmu_tx_t *tx); 473 struct arc_buf *dmu_request_arcbuf(dmu_buf_t *handle, int size); 474 void dmu_return_arcbuf(struct arc_buf *buf); 475 void dmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, struct arc_buf *buf, 476 dmu_tx_t *tx); 477 478 extern int zfs_prefetch_disable; 479 480 /* 481 * Asynchronously try to read in the data. 482 */ 483 void dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, 484 uint64_t len); 485 486 typedef struct dmu_object_info { 487 /* All sizes are in bytes. */ 488 uint32_t doi_data_block_size; 489 uint32_t doi_metadata_block_size; 490 uint64_t doi_bonus_size; 491 dmu_object_type_t doi_type; 492 dmu_object_type_t doi_bonus_type; 493 uint8_t doi_indirection; /* 2 = dnode->indirect->data */ 494 uint8_t doi_checksum; 495 uint8_t doi_compress; 496 uint8_t doi_pad[5]; 497 /* Values below are number of 512-byte blocks. */ 498 uint64_t doi_physical_blks; /* data + metadata */ 499 uint64_t doi_max_block_offset; 500 } dmu_object_info_t; 501 502 typedef void arc_byteswap_func_t(void *buf, size_t size); 503 504 typedef struct dmu_object_type_info { 505 arc_byteswap_func_t *ot_byteswap; 506 boolean_t ot_metadata; 507 char *ot_name; 508 } dmu_object_type_info_t; 509 510 extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES]; 511 512 /* 513 * Get information on a DMU object. 514 * 515 * Return 0 on success or ENOENT if object is not allocated. 516 * 517 * If doi is NULL, just indicates whether the object exists. 518 */ 519 int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi); 520 void dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi); 521 void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi); 522 void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize, 523 u_longlong_t *nblk512); 524 525 typedef struct dmu_objset_stats { 526 uint64_t dds_num_clones; /* number of clones of this */ 527 uint64_t dds_creation_txg; 528 uint64_t dds_guid; 529 dmu_objset_type_t dds_type; 530 uint8_t dds_is_snapshot; 531 uint8_t dds_inconsistent; 532 char dds_origin[MAXNAMELEN]; 533 } dmu_objset_stats_t; 534 535 /* 536 * Get stats on a dataset. 537 */ 538 void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat); 539 540 /* 541 * Add entries to the nvlist for all the objset's properties. See 542 * zfs_prop_table[] and zfs(1m) for details on the properties. 543 */ 544 void dmu_objset_stats(objset_t *os, struct nvlist *nv); 545 546 /* 547 * Get the space usage statistics for statvfs(). 548 * 549 * refdbytes is the amount of space "referenced" by this objset. 550 * availbytes is the amount of space available to this objset, taking 551 * into account quotas & reservations, assuming that no other objsets 552 * use the space first. These values correspond to the 'referenced' and 553 * 'available' properties, described in the zfs(1m) manpage. 554 * 555 * usedobjs and availobjs are the number of objects currently allocated, 556 * and available. 557 */ 558 void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 559 uint64_t *usedobjsp, uint64_t *availobjsp); 560 561 /* 562 * The fsid_guid is a 56-bit ID that can change to avoid collisions. 563 * (Contrast with the ds_guid which is a 64-bit ID that will never 564 * change, so there is a small probability that it will collide.) 565 */ 566 uint64_t dmu_objset_fsid_guid(objset_t *os); 567 568 int dmu_objset_is_snapshot(objset_t *os); 569 570 extern struct spa *dmu_objset_spa(objset_t *os); 571 extern struct zilog *dmu_objset_zil(objset_t *os); 572 extern struct dsl_pool *dmu_objset_pool(objset_t *os); 573 extern struct dsl_dataset *dmu_objset_ds(objset_t *os); 574 extern void dmu_objset_name(objset_t *os, char *buf); 575 extern dmu_objset_type_t dmu_objset_type(objset_t *os); 576 extern uint64_t dmu_objset_id(objset_t *os); 577 extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 578 uint64_t *id, uint64_t *offp, boolean_t *case_conflict); 579 extern int dmu_snapshot_realname(objset_t *os, char *name, char *real, 580 int maxlen, boolean_t *conflict); 581 extern int dmu_dir_list_next(objset_t *os, int namelen, char *name, 582 uint64_t *idp, uint64_t *offp); 583 584 typedef void objset_used_cb_t(objset_t *os, dmu_object_type_t bonustype, 585 void *oldbonus, void *newbonus, uint64_t oldused, uint64_t newused, 586 dmu_tx_t *tx); 587 extern void dmu_objset_register_type(dmu_objset_type_t ost, 588 objset_used_cb_t *cb); 589 extern void dmu_objset_set_user(objset_t *os, void *user_ptr); 590 extern void *dmu_objset_get_user(objset_t *os); 591 592 /* 593 * Return the txg number for the given assigned transaction. 594 */ 595 uint64_t dmu_tx_get_txg(dmu_tx_t *tx); 596 597 /* 598 * Synchronous write. 599 * If a parent zio is provided this function initiates a write on the 600 * provided buffer as a child of the parent zio. 601 * In the absence of a parent zio, the write is completed synchronously. 602 * At write completion, blk is filled with the bp of the written block. 603 * Note that while the data covered by this function will be on stable 604 * storage when the write completes this new data does not become a 605 * permanent part of the file until the associated transaction commits. 606 */ 607 typedef void dmu_sync_cb_t(dmu_buf_t *db, void *arg); 608 int dmu_sync(struct zio *zio, dmu_buf_t *db, 609 struct blkptr *bp, uint64_t txg, dmu_sync_cb_t *done, void *arg); 610 611 /* 612 * Find the next hole or data block in file starting at *off 613 * Return found offset in *off. Return ESRCH for end of file. 614 */ 615 int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, 616 uint64_t *off); 617 618 /* 619 * Initial setup and final teardown. 620 */ 621 extern void dmu_init(void); 622 extern void dmu_fini(void); 623 624 typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp, 625 uint64_t object, uint64_t offset, int len); 626 void dmu_traverse_objset(objset_t *os, uint64_t txg_start, 627 dmu_traverse_cb_t cb, void *arg); 628 629 int dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin, 630 struct vnode *vp, offset_t *off); 631 632 typedef struct dmu_recv_cookie { 633 /* 634 * This structure is opaque! 635 * 636 * If logical and real are different, we are recving the stream 637 * into the "real" temporary clone, and then switching it with 638 * the "logical" target. 639 */ 640 struct dsl_dataset *drc_logical_ds; 641 struct dsl_dataset *drc_real_ds; 642 struct drr_begin *drc_drrb; 643 char *drc_tosnap; 644 boolean_t drc_newfs; 645 boolean_t drc_force; 646 } dmu_recv_cookie_t; 647 648 int dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *, 649 boolean_t force, objset_t *origin, boolean_t online, dmu_recv_cookie_t *); 650 int dmu_recv_stream(dmu_recv_cookie_t *drc, struct vnode *vp, offset_t *voffp); 651 int dmu_recv_end(dmu_recv_cookie_t *drc); 652 void dmu_recv_abort_cleanup(dmu_recv_cookie_t *drc); 653 654 /* CRC64 table */ 655 #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */ 656 extern uint64_t zfs_crc64_table[256]; 657 658 #ifdef __cplusplus 659 } 660 #endif 661 662 #endif /* _SYS_DMU_H */ 663