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