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 2006 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 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 /* 32 * This file describes the interface that the DMU provides for its 33 * consumers. 34 * 35 * The DMU also interacts with the SPA. That interface is described in 36 * dmu_spa.h. 37 */ 38 39 #include <sys/inttypes.h> 40 #include <sys/types.h> 41 #include <sys/param.h> 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 struct uio; 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 63 typedef struct objset objset_t; 64 typedef struct dmu_tx dmu_tx_t; 65 typedef struct dsl_dir dsl_dir_t; 66 67 typedef enum dmu_object_type { 68 DMU_OT_NONE, 69 /* general: */ 70 DMU_OT_OBJECT_DIRECTORY, /* ZAP */ 71 DMU_OT_OBJECT_ARRAY, /* UINT64 */ 72 DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */ 73 DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */ 74 DMU_OT_BPLIST, /* UINT64 */ 75 DMU_OT_BPLIST_HDR, /* UINT64 */ 76 /* spa: */ 77 DMU_OT_SPACE_MAP_HEADER, /* UINT64 */ 78 DMU_OT_SPACE_MAP, /* UINT64 */ 79 /* zil: */ 80 DMU_OT_INTENT_LOG, /* UINT64 */ 81 /* dmu: */ 82 DMU_OT_DNODE, /* DNODE */ 83 DMU_OT_OBJSET, /* OBJSET */ 84 /* dsl: */ 85 DMU_OT_DSL_DIR, /* UINT64 */ 86 DMU_OT_DSL_DIR_CHILD_MAP, /* ZAP */ 87 DMU_OT_DSL_DS_SNAP_MAP, /* ZAP */ 88 DMU_OT_DSL_PROPS, /* ZAP */ 89 DMU_OT_DSL_DATASET, /* UINT64 */ 90 /* zpl: */ 91 DMU_OT_ZNODE, /* ZNODE */ 92 DMU_OT_ACL, /* ACL */ 93 DMU_OT_PLAIN_FILE_CONTENTS, /* UINT8 */ 94 DMU_OT_DIRECTORY_CONTENTS, /* ZAP */ 95 DMU_OT_MASTER_NODE, /* ZAP */ 96 DMU_OT_DELETE_QUEUE, /* ZAP */ 97 /* zvol: */ 98 DMU_OT_ZVOL, /* UINT8 */ 99 DMU_OT_ZVOL_PROP, /* ZAP */ 100 /* other; for testing only! */ 101 DMU_OT_PLAIN_OTHER, /* UINT8 */ 102 DMU_OT_UINT64_OTHER, /* UINT64 */ 103 DMU_OT_ZAP_OTHER, /* ZAP */ 104 /* new object types: */ 105 DMU_OT_ERROR_LOG, /* ZAP */ 106 107 DMU_OT_NUMTYPES 108 } dmu_object_type_t; 109 110 typedef enum dmu_objset_type { 111 DMU_OST_NONE, 112 DMU_OST_META, 113 DMU_OST_ZFS, 114 DMU_OST_ZVOL, 115 DMU_OST_OTHER, /* For testing only! */ 116 DMU_OST_ANY, /* Be careful! */ 117 DMU_OST_NUMTYPES 118 } dmu_objset_type_t; 119 120 void byteswap_uint64_array(void *buf, size_t size); 121 void byteswap_uint32_array(void *buf, size_t size); 122 void byteswap_uint16_array(void *buf, size_t size); 123 void byteswap_uint8_array(void *buf, size_t size); 124 void zap_byteswap(void *buf, size_t size); 125 void zfs_acl_byteswap(void *buf, size_t size); 126 void zfs_znode_byteswap(void *buf, size_t size); 127 128 #define DS_MODE_NONE 0 /* invalid, to aid debugging */ 129 #define DS_MODE_STANDARD 1 /* normal access, no special needs */ 130 #define DS_MODE_PRIMARY 2 /* the "main" access, e.g. a mount */ 131 #define DS_MODE_EXCLUSIVE 3 /* exclusive access, e.g. to destroy */ 132 #define DS_MODE_LEVELS 4 133 #define DS_MODE_LEVEL(x) ((x) & (DS_MODE_LEVELS - 1)) 134 #define DS_MODE_READONLY 0x8 135 #define DS_MODE_IS_READONLY(x) ((x) & DS_MODE_READONLY) 136 #define DS_MODE_INCONSISTENT 0x10 137 #define DS_MODE_IS_INCONSISTENT(x) ((x) & DS_MODE_INCONSISTENT) 138 139 #define DS_FIND_SNAPSHOTS (1<<0) 140 #define DS_FIND_CHILDREN (1<<1) 141 142 /* 143 * The maximum number of bytes that can be accessed as part of one 144 * operation, including metadata. 145 */ 146 #define DMU_MAX_ACCESS (10<<20) /* 10MB */ 147 148 /* 149 * Public routines to create, destroy, open, and close objsets. 150 */ 151 int dmu_objset_open(const char *name, dmu_objset_type_t type, int mode, 152 objset_t **osp); 153 void dmu_objset_close(objset_t *os); 154 int dmu_objset_evict_dbufs(objset_t *os, int try); 155 int dmu_objset_create(const char *name, dmu_objset_type_t type, 156 objset_t *clone_parent, 157 void (*func)(objset_t *os, void *arg, dmu_tx_t *tx), void *arg); 158 int dmu_objset_destroy(const char *name); 159 int dmu_snapshots_destroy(char *fsname, char *snapname); 160 int dmu_objset_rollback(const char *name); 161 int dmu_objset_snapshot(char *fsname, char *snapname, boolean_t recursive); 162 int dmu_objset_rename(const char *name, const char *newname); 163 void dmu_objset_set_quota(objset_t *os, uint64_t quota); 164 uint64_t dmu_objset_get_quota(objset_t *os); 165 int dmu_objset_request_reservation(objset_t *os, uint64_t reservation); 166 int dmu_objset_find(char *name, int func(char *, void *), void *arg, 167 int flags); 168 void dmu_objset_byteswap(void *buf, size_t size); 169 170 typedef struct dmu_buf { 171 uint64_t db_object; /* object that this buffer is part of */ 172 uint64_t db_offset; /* byte offset in this object */ 173 uint64_t db_size; /* size of buffer in bytes */ 174 void *db_data; /* data in buffer */ 175 } dmu_buf_t; 176 177 typedef void dmu_buf_evict_func_t(struct dmu_buf *db, void *user_ptr); 178 179 /* 180 * Callback function to perform byte swapping on a block. 181 */ 182 typedef void dmu_byteswap_func_t(void *buf, size_t size); 183 184 /* 185 * The names of zap entries in the DIRECTORY_OBJECT of the MOS. 186 */ 187 #define DMU_POOL_DIRECTORY_OBJECT 1 188 #define DMU_POOL_CONFIG "config" 189 #define DMU_POOL_ROOT_DATASET "root_dataset" 190 #define DMU_POOL_SYNC_BPLIST "sync_bplist" 191 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub" 192 #define DMU_POOL_ERRLOG_LAST "errlog_last" 193 #define DMU_POOL_SPARES "spares" 194 #define DMU_POOL_DEFLATE "deflate" 195 196 /* 197 * Allocate an object from this objset. The range of object numbers 198 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode. 199 * 200 * The transaction must be assigned to a txg. The newly allocated 201 * object will be "held" in the transaction (ie. you can modify the 202 * newly allocated object in this transaction). 203 * 204 * dmu_object_alloc() chooses an object and returns it in *objectp. 205 * 206 * dmu_object_claim() allocates a specific object number. If that 207 * number is already allocated, it fails and returns EEXIST. 208 * 209 * Return 0 on success, or ENOSPC or EEXIST as specified above. 210 */ 211 uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot, 212 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 213 int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 214 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 215 int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 216 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 217 218 /* 219 * Free an object from this objset. 220 * 221 * The object's data will be freed as well (ie. you don't need to call 222 * dmu_free(object, 0, -1, tx)). 223 * 224 * The object need not be held in the transaction. 225 * 226 * If there are any holds on this object's buffers (via dmu_buf_hold()), 227 * or tx holds on the object (via dmu_tx_hold_object()), you can not 228 * free it; it fails and returns EBUSY. 229 * 230 * If the object is not allocated, it fails and returns ENOENT. 231 * 232 * Return 0 on success, or EBUSY or ENOENT as specified above. 233 */ 234 int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx); 235 236 /* 237 * Find the next allocated or free object. 238 * 239 * The objectp parameter is in-out. It will be updated to be the next 240 * object which is allocated. 241 * 242 * XXX Can only be called on a objset with no dirty data. 243 * 244 * Returns 0 on success, or ENOENT if there are no more objects. 245 */ 246 int dmu_object_next(objset_t *os, uint64_t *objectp, boolean_t hole); 247 248 /* 249 * Set the data blocksize for an object. 250 * 251 * The object cannot have any blocks allcated beyond the first. If 252 * the first block is allocated already, the new size must be greater 253 * than the current block size. If these conditions are not met, 254 * ENOTSUP will be returned. 255 * 256 * Returns 0 on success, or EBUSY if there are any holds on the object 257 * contents, or ENOTSUP as described above. 258 */ 259 int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, 260 int ibs, dmu_tx_t *tx); 261 262 /* 263 * Set the checksum property on a dnode. The new checksum algorithm will 264 * apply to all newly written blocks; existing blocks will not be affected. 265 */ 266 void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum, 267 dmu_tx_t *tx); 268 269 /* 270 * Set the compress property on a dnode. The new compression algorithm will 271 * apply to all newly written blocks; existing blocks will not be affected. 272 */ 273 void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress, 274 dmu_tx_t *tx); 275 276 /* 277 * Decide how many copies of a given block we should make. Can be from 278 * 1 to SPA_DVAS_PER_BP. 279 */ 280 int dmu_get_replication_level(struct spa *spa, struct zbookmark *zb, 281 dmu_object_type_t ot); 282 /* 283 * The bonus data is accessed more or less like a regular buffer. 284 * You must dmu_bonus_hold() to get the buffer, which will give you a 285 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus 286 * data. As with any normal buffer, you must call dmu_buf_read() to 287 * read db_data, dmu_buf_will_dirty() before modifying it, and the 288 * object must be held in an assigned transaction before calling 289 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus 290 * buffer as well. You must release your hold with dmu_buf_rele(). 291 */ 292 int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **); 293 int dmu_bonus_max(void); 294 295 /* 296 * Obtain the DMU buffer from the specified object which contains the 297 * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so 298 * that it will remain in memory. You must release the hold with 299 * dmu_buf_rele(). You musn't access the dmu_buf_t after releasing your 300 * hold. You must have a hold on any dmu_buf_t* you pass to the DMU. 301 * 302 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill 303 * on the returned buffer before reading or writing the buffer's 304 * db_data. The comments for those routines describe what particular 305 * operations are valid after calling them. 306 * 307 * The object number must be a valid, allocated object number. 308 */ 309 int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset, 310 void *tag, dmu_buf_t **); 311 void dmu_buf_add_ref(dmu_buf_t *db, void* tag); 312 void dmu_buf_rele(dmu_buf_t *db, void *tag); 313 uint64_t dmu_buf_refcount(dmu_buf_t *db); 314 315 /* 316 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a 317 * range of an object. A pointer to an array of dmu_buf_t*'s is 318 * returned (in *dbpp). 319 * 320 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and 321 * frees the array. The hold on the array of buffers MUST be released 322 * with dmu_buf_rele_array. You can NOT release the hold on each buffer 323 * individually with dmu_buf_rele. 324 */ 325 int dmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset, 326 uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp); 327 int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset, 328 uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp); 329 void dmu_buf_rele_array(dmu_buf_t **, int numbufs, void *tag); 330 331 /* 332 * Returns NULL on success, or the existing user ptr if it's already 333 * been set. 334 * 335 * user_ptr is for use by the user and can be obtained via dmu_buf_get_user(). 336 * 337 * user_data_ptr_ptr should be NULL, or a pointer to a pointer which 338 * will be set to db->db_data when you are allowed to access it. Note 339 * that db->db_data (the pointer) can change when you do dmu_buf_read(), 340 * dmu_buf_tryupgrade(), dmu_buf_will_dirty(), or dmu_buf_will_fill(). 341 * *user_data_ptr_ptr will be set to the new value when it changes. 342 * 343 * If non-NULL, pageout func will be called when this buffer is being 344 * excised from the cache, so that you can clean up the data structure 345 * pointed to by user_ptr. 346 * 347 * dmu_evict_user() will call the pageout func for all buffers in a 348 * objset with a given pageout func. 349 */ 350 void *dmu_buf_set_user(dmu_buf_t *db, void *user_ptr, void *user_data_ptr_ptr, 351 dmu_buf_evict_func_t *pageout_func); 352 /* 353 * set_user_ie is the same as set_user, but request immediate eviction 354 * when hold count goes to zero. 355 */ 356 void *dmu_buf_set_user_ie(dmu_buf_t *db, void *user_ptr, 357 void *user_data_ptr_ptr, dmu_buf_evict_func_t *pageout_func); 358 void *dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, 359 void *user_ptr, void *user_data_ptr_ptr, 360 dmu_buf_evict_func_t *pageout_func); 361 void dmu_evict_user(objset_t *os, dmu_buf_evict_func_t *func); 362 363 void dmu_buf_hold_data(dmu_buf_t *db); 364 void dmu_buf_rele_data(dmu_buf_t *db); 365 366 /* 367 * Returns the user_ptr set with dmu_buf_set_user(), or NULL if not set. 368 */ 369 void *dmu_buf_get_user(dmu_buf_t *db); 370 371 /* 372 * Indicate that you are going to modify the buffer's data (db_data). 373 * 374 * The transaction (tx) must be assigned to a txg (ie. you've called 375 * dmu_tx_assign()). The buffer's object must be held in the tx 376 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)). 377 */ 378 void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx); 379 380 /* 381 * You must create a transaction, then hold the objects which you will 382 * (or might) modify as part of this transaction. Then you must assign 383 * the transaction to a transaction group. Once the transaction has 384 * been assigned, you can modify buffers which belong to held objects as 385 * part of this transaction. You can't modify buffers before the 386 * transaction has been assigned; you can't modify buffers which don't 387 * belong to objects which this transaction holds; you can't hold 388 * objects once the transaction has been assigned. You may hold an 389 * object which you are going to free (with dmu_object_free()), but you 390 * don't have to. 391 * 392 * You can abort the transaction before it has been assigned. 393 * 394 * Note that you may hold buffers (with dmu_buf_hold) at any time, 395 * regardless of transaction state. 396 */ 397 398 #define DMU_NEW_OBJECT (-1ULL) 399 #define DMU_OBJECT_END (-1ULL) 400 401 dmu_tx_t *dmu_tx_create(objset_t *os); 402 void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len); 403 void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off, 404 uint64_t len); 405 void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, char *name); 406 void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object); 407 void dmu_tx_abort(dmu_tx_t *tx); 408 int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how); 409 void dmu_tx_wait(dmu_tx_t *tx); 410 void dmu_tx_commit(dmu_tx_t *tx); 411 412 /* 413 * Free up the data blocks for a defined range of a file. If size is 414 * zero, the range from offset to end-of-file is freed. 415 */ 416 int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset, 417 uint64_t size, dmu_tx_t *tx); 418 419 /* 420 * Convenience functions. 421 * 422 * Canfail routines will return 0 on success, or an errno if there is a 423 * nonrecoverable I/O error. 424 */ 425 int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 426 void *buf); 427 void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 428 const void *buf, dmu_tx_t *tx); 429 int dmu_write_uio(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 430 struct uio *uio, dmu_tx_t *tx); 431 int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, 432 uint64_t size, struct page *pp, dmu_tx_t *tx); 433 434 /* 435 * Asynchronously try to read in the data. 436 */ 437 void dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, 438 uint64_t len); 439 440 typedef struct dmu_object_info { 441 /* All sizes are in bytes. */ 442 uint32_t doi_data_block_size; 443 uint32_t doi_metadata_block_size; 444 uint64_t doi_bonus_size; 445 dmu_object_type_t doi_type; 446 dmu_object_type_t doi_bonus_type; 447 uint8_t doi_indirection; /* 2 = dnode->indirect->data */ 448 uint8_t doi_checksum; 449 uint8_t doi_compress; 450 uint8_t doi_pad[5]; 451 /* Values below are number of 512-byte blocks. */ 452 uint64_t doi_physical_blks; /* data + metadata */ 453 uint64_t doi_max_block_offset; 454 } dmu_object_info_t; 455 456 typedef struct dmu_object_type_info { 457 dmu_byteswap_func_t *ot_byteswap; 458 boolean_t ot_metadata; 459 char *ot_name; 460 } dmu_object_type_info_t; 461 462 extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES]; 463 464 /* 465 * Get information on a DMU object. 466 * 467 * Return 0 on success or ENOENT if object is not allocated. 468 * 469 * If doi is NULL, just indicates whether the object exists. 470 */ 471 int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi); 472 void dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi); 473 void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi); 474 void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize, 475 u_longlong_t *nblk512); 476 477 /* 478 * Get the maximum nonzero offset in the object (ie. this offset and all 479 * offsets following are zero). 480 * 481 * XXX Perhaps integrate this with dmu_object_info(), although that 482 * would then have to bring in the indirect blocks. 483 */ 484 uint64_t dmu_object_max_nonzero_offset(objset_t *os, uint64_t object); 485 486 typedef struct dmu_objset_stats { 487 dmu_objset_type_t dds_type; 488 uint8_t dds_is_snapshot; 489 uint8_t dds_inconsistent; 490 uint8_t dds_pad[2]; 491 492 uint64_t dds_creation_time; 493 uint64_t dds_creation_txg; 494 495 char dds_clone_of[MAXNAMELEN]; 496 497 /* How much data is there in this objset? */ 498 499 /* 500 * Space referenced, taking into account pending writes and 501 * frees. Only relavent to filesystems and snapshots (not 502 * collections). 503 */ 504 uint64_t dds_space_refd; 505 506 /* 507 * Space "used", taking into account pending writes and frees, and 508 * children's reservations (in bytes). This is the amount of 509 * space that will be freed if this and all dependent items are 510 * destroyed (eg. child datasets, objsets, and snapshots). So 511 * for snapshots, this is the amount of space unique to this 512 * snapshot. 513 */ 514 uint64_t dds_space_used; 515 516 /* 517 * Compressed and uncompressed bytes consumed. Does not take 518 * into account reservations. Used for computing compression 519 * ratio. 520 */ 521 uint64_t dds_compressed_bytes; 522 uint64_t dds_uncompressed_bytes; 523 524 /* 525 * The ds_fsid_guid is a 56-bit ID that can change to avoid 526 * collisions. The ds_guid is a 64-bit ID that will never 527 * change, so there is a small probability that it will collide. 528 */ 529 uint64_t dds_fsid_guid; 530 531 uint64_t dds_objects_used; /* number of objects used */ 532 uint64_t dds_objects_avail; /* number of objects available */ 533 534 uint64_t dds_num_clones; /* number of clones of this */ 535 536 /* The dataset's administratively-set quota, in bytes. */ 537 uint64_t dds_quota; 538 539 /* The dataset's administratively-set reservation, in bytes */ 540 uint64_t dds_reserved; 541 542 /* 543 * The amount of additional space that this dataset can consume. 544 * Takes into account quotas & reservations. 545 * (Assuming that no other datasets consume it first.) 546 */ 547 uint64_t dds_available; 548 549 /* 550 * Used for debugging purposes 551 */ 552 uint64_t dds_last_txg; 553 } dmu_objset_stats_t; 554 555 /* 556 * Get stats on a dataset. 557 */ 558 void dmu_objset_stats(objset_t *os, dmu_objset_stats_t *dds); 559 560 int dmu_objset_is_snapshot(objset_t *os); 561 562 extern struct spa *dmu_objset_spa(objset_t *os); 563 extern struct zilog *dmu_objset_zil(objset_t *os); 564 extern struct dsl_pool *dmu_objset_pool(objset_t *os); 565 extern struct dsl_dataset *dmu_objset_ds(objset_t *os); 566 extern void dmu_objset_name(objset_t *os, char *buf); 567 extern dmu_objset_type_t dmu_objset_type(objset_t *os); 568 extern uint64_t dmu_objset_id(objset_t *os); 569 extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 570 uint64_t *id, uint64_t *offp); 571 extern int dmu_dir_list_next(objset_t *os, int namelen, char *name, 572 uint64_t *idp, uint64_t *offp); 573 574 /* 575 * Return the txg number for the given assigned transaction. 576 */ 577 uint64_t dmu_tx_get_txg(dmu_tx_t *tx); 578 579 /* 580 * Synchronous write. 581 * If a parent zio is provided this function initiates a write on the 582 * provided buffer as a child of the parent zio. 583 * In the absense of a parent zio, the write is completed synchronously. 584 * At write completion, blk is filled with the bp of the written block. 585 * Note that while the data covered by this function will be on stable 586 * storage when the write completes this new data does not become a 587 * permanent part of the file until the associated transaction commits. 588 */ 589 typedef void dmu_sync_cb_t(dmu_buf_t *db, void *arg); 590 int dmu_sync(struct zio *zio, dmu_buf_t *db, 591 struct blkptr *bp, uint64_t txg, dmu_sync_cb_t *done, void *arg); 592 593 /* 594 * Find the next hole or data block in file starting at *off 595 * Return found offset in *off. Return ESRCH for end of file. 596 */ 597 int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, 598 uint64_t *off); 599 600 /* 601 * Initial setup and final teardown. 602 */ 603 extern void dmu_init(void); 604 extern void dmu_fini(void); 605 606 typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp, 607 uint64_t object, uint64_t offset, int len); 608 void dmu_traverse_objset(objset_t *os, uint64_t txg_start, 609 dmu_traverse_cb_t cb, void *arg); 610 611 int dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, struct vnode *vp); 612 int dmu_recvbackup(char *tosnap, struct drr_begin *drrb, uint64_t *sizep, 613 boolean_t force, struct vnode *vp, uint64_t voffset); 614 615 /* CRC64 table */ 616 #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */ 617 extern uint64_t zfs_crc64_table[256]; 618 619 #ifdef __cplusplus 620 } 621 #endif 622 623 #endif /* _SYS_DMU_H */ 624