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 2007 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 struct nvlist; 63 struct objset_impl; 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_ACL, /* 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 */ 111 112 DMU_OT_NUMTYPES 113 } dmu_object_type_t; 114 115 typedef enum dmu_objset_type { 116 DMU_OST_NONE, 117 DMU_OST_META, 118 DMU_OST_ZFS, 119 DMU_OST_ZVOL, 120 DMU_OST_OTHER, /* For testing only! */ 121 DMU_OST_ANY, /* Be careful! */ 122 DMU_OST_NUMTYPES 123 } dmu_objset_type_t; 124 125 void byteswap_uint64_array(void *buf, size_t size); 126 void byteswap_uint32_array(void *buf, size_t size); 127 void byteswap_uint16_array(void *buf, size_t size); 128 void byteswap_uint8_array(void *buf, size_t size); 129 void zap_byteswap(void *buf, size_t size); 130 void zfs_acl_byteswap(void *buf, size_t size); 131 void zfs_znode_byteswap(void *buf, size_t size); 132 133 #define DS_MODE_NONE 0 /* invalid, to aid debugging */ 134 #define DS_MODE_STANDARD 1 /* normal access, no special needs */ 135 #define DS_MODE_PRIMARY 2 /* the "main" access, e.g. a mount */ 136 #define DS_MODE_EXCLUSIVE 3 /* exclusive access, e.g. to destroy */ 137 #define DS_MODE_LEVELS 4 138 #define DS_MODE_LEVEL(x) ((x) & (DS_MODE_LEVELS - 1)) 139 #define DS_MODE_READONLY 0x8 140 #define DS_MODE_IS_READONLY(x) ((x) & DS_MODE_READONLY) 141 #define DS_MODE_INCONSISTENT 0x10 142 #define DS_MODE_IS_INCONSISTENT(x) ((x) & DS_MODE_INCONSISTENT) 143 144 #define DS_FIND_SNAPSHOTS (1<<0) 145 #define DS_FIND_CHILDREN (1<<1) 146 147 /* 148 * The maximum number of bytes that can be accessed as part of one 149 * operation, including metadata. 150 */ 151 #define DMU_MAX_ACCESS (10<<20) /* 10MB */ 152 153 /* 154 * Public routines to create, destroy, open, and close objsets. 155 */ 156 int dmu_objset_open(const char *name, dmu_objset_type_t type, int mode, 157 objset_t **osp); 158 void dmu_objset_close(objset_t *os); 159 int dmu_objset_evict_dbufs(objset_t *os, int try); 160 int dmu_objset_create(const char *name, dmu_objset_type_t type, 161 objset_t *clone_parent, 162 void (*func)(objset_t *os, void *arg, dmu_tx_t *tx), void *arg); 163 int dmu_objset_destroy(const char *name); 164 int dmu_snapshots_destroy(char *fsname, char *snapname); 165 int dmu_objset_rollback(const char *name); 166 int dmu_objset_snapshot(char *fsname, char *snapname, boolean_t recursive); 167 int dmu_objset_rename(const char *name, const char *newname, 168 boolean_t recursive); 169 int dmu_objset_find(char *name, int func(char *, void *), void *arg, 170 int flags); 171 void dmu_objset_byteswap(void *buf, size_t size); 172 173 typedef struct dmu_buf { 174 uint64_t db_object; /* object that this buffer is part of */ 175 uint64_t db_offset; /* byte offset in this object */ 176 uint64_t db_size; /* size of buffer in bytes */ 177 void *db_data; /* data in buffer */ 178 } dmu_buf_t; 179 180 typedef void dmu_buf_evict_func_t(struct dmu_buf *db, void *user_ptr); 181 182 /* 183 * Callback function to perform byte swapping on a block. 184 */ 185 typedef void dmu_byteswap_func_t(void *buf, size_t size); 186 187 /* 188 * The names of zap entries in the DIRECTORY_OBJECT of the MOS. 189 */ 190 #define DMU_POOL_DIRECTORY_OBJECT 1 191 #define DMU_POOL_CONFIG "config" 192 #define DMU_POOL_ROOT_DATASET "root_dataset" 193 #define DMU_POOL_SYNC_BPLIST "sync_bplist" 194 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub" 195 #define DMU_POOL_ERRLOG_LAST "errlog_last" 196 #define DMU_POOL_SPARES "spares" 197 #define DMU_POOL_DEFLATE "deflate" 198 #define DMU_POOL_HISTORY "history" 199 #define DMU_POOL_PROPS "pool_props" 200 201 /* 202 * Allocate an object from this objset. The range of object numbers 203 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode. 204 * 205 * The transaction must be assigned to a txg. The newly allocated 206 * object will be "held" in the transaction (ie. you can modify the 207 * newly allocated object in this transaction). 208 * 209 * dmu_object_alloc() chooses an object and returns it in *objectp. 210 * 211 * dmu_object_claim() allocates a specific object number. If that 212 * number is already allocated, it fails and returns EEXIST. 213 * 214 * Return 0 on success, or ENOSPC or EEXIST as specified above. 215 */ 216 uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot, 217 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 218 int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 219 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 220 int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 221 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 222 223 /* 224 * Free an object from this objset. 225 * 226 * The object's data will be freed as well (ie. you don't need to call 227 * dmu_free(object, 0, -1, tx)). 228 * 229 * The object need not be held in the transaction. 230 * 231 * If there are any holds on this object's buffers (via dmu_buf_hold()), 232 * or tx holds on the object (via dmu_tx_hold_object()), you can not 233 * free it; it fails and returns EBUSY. 234 * 235 * If the object is not allocated, it fails and returns ENOENT. 236 * 237 * Return 0 on success, or EBUSY or ENOENT as specified above. 238 */ 239 int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx); 240 241 /* 242 * Find the next allocated or free object. 243 * 244 * The objectp parameter is in-out. It will be updated to be the next 245 * object which is allocated. Ignore objects which have not been 246 * modified since txg. 247 * 248 * XXX Can only be called on a objset with no dirty data. 249 * 250 * Returns 0 on success, or ENOENT if there are no more objects. 251 */ 252 int dmu_object_next(objset_t *os, uint64_t *objectp, 253 boolean_t hole, uint64_t txg); 254 255 /* 256 * Set the data blocksize for an object. 257 * 258 * The object cannot have any blocks allcated beyond the first. If 259 * the first block is allocated already, the new size must be greater 260 * than the current block size. If these conditions are not met, 261 * ENOTSUP will be returned. 262 * 263 * Returns 0 on success, or EBUSY if there are any holds on the object 264 * contents, or ENOTSUP as described above. 265 */ 266 int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, 267 int ibs, dmu_tx_t *tx); 268 269 /* 270 * Set the checksum property on a dnode. The new checksum algorithm will 271 * apply to all newly written blocks; existing blocks will not be affected. 272 */ 273 void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum, 274 dmu_tx_t *tx); 275 276 /* 277 * Set the compress property on a dnode. The new compression algorithm will 278 * apply to all newly written blocks; existing blocks will not be affected. 279 */ 280 void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress, 281 dmu_tx_t *tx); 282 283 /* 284 * Decide how many copies of a given block we should make. Can be from 285 * 1 to SPA_DVAS_PER_BP. 286 */ 287 int dmu_get_replication_level(struct objset_impl *, struct zbookmark *zb, 288 dmu_object_type_t ot); 289 /* 290 * The bonus data is accessed more or less like a regular buffer. 291 * You must dmu_bonus_hold() to get the buffer, which will give you a 292 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus 293 * data. As with any normal buffer, you must call dmu_buf_read() to 294 * read db_data, dmu_buf_will_dirty() before modifying it, and the 295 * object must be held in an assigned transaction before calling 296 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus 297 * buffer as well. You must release your hold with dmu_buf_rele(). 298 */ 299 int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **); 300 int dmu_bonus_max(void); 301 302 /* 303 * Obtain the DMU buffer from the specified object which contains the 304 * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so 305 * that it will remain in memory. You must release the hold with 306 * dmu_buf_rele(). You musn't access the dmu_buf_t after releasing your 307 * hold. You must have a hold on any dmu_buf_t* you pass to the DMU. 308 * 309 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill 310 * on the returned buffer before reading or writing the buffer's 311 * db_data. The comments for those routines describe what particular 312 * operations are valid after calling them. 313 * 314 * The object number must be a valid, allocated object number. 315 */ 316 int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset, 317 void *tag, dmu_buf_t **); 318 void dmu_buf_add_ref(dmu_buf_t *db, void* tag); 319 void dmu_buf_rele(dmu_buf_t *db, void *tag); 320 uint64_t dmu_buf_refcount(dmu_buf_t *db); 321 322 /* 323 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a 324 * range of an object. A pointer to an array of dmu_buf_t*'s is 325 * returned (in *dbpp). 326 * 327 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and 328 * frees the array. The hold on the array of buffers MUST be released 329 * with dmu_buf_rele_array. You can NOT release the hold on each buffer 330 * individually with dmu_buf_rele. 331 */ 332 int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset, 333 uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp); 334 void dmu_buf_rele_array(dmu_buf_t **, int numbufs, void *tag); 335 336 /* 337 * Returns NULL on success, or the existing user ptr if it's already 338 * been set. 339 * 340 * user_ptr is for use by the user and can be obtained via dmu_buf_get_user(). 341 * 342 * user_data_ptr_ptr should be NULL, or a pointer to a pointer which 343 * will be set to db->db_data when you are allowed to access it. Note 344 * that db->db_data (the pointer) can change when you do dmu_buf_read(), 345 * dmu_buf_tryupgrade(), dmu_buf_will_dirty(), or dmu_buf_will_fill(). 346 * *user_data_ptr_ptr will be set to the new value when it changes. 347 * 348 * If non-NULL, pageout func will be called when this buffer is being 349 * excised from the cache, so that you can clean up the data structure 350 * pointed to by user_ptr. 351 * 352 * dmu_evict_user() will call the pageout func for all buffers in a 353 * objset with a given pageout func. 354 */ 355 void *dmu_buf_set_user(dmu_buf_t *db, void *user_ptr, void *user_data_ptr_ptr, 356 dmu_buf_evict_func_t *pageout_func); 357 /* 358 * set_user_ie is the same as set_user, but request immediate eviction 359 * when hold count goes to zero. 360 */ 361 void *dmu_buf_set_user_ie(dmu_buf_t *db, void *user_ptr, 362 void *user_data_ptr_ptr, dmu_buf_evict_func_t *pageout_func); 363 void *dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, 364 void *user_ptr, void *user_data_ptr_ptr, 365 dmu_buf_evict_func_t *pageout_func); 366 void dmu_evict_user(objset_t *os, dmu_buf_evict_func_t *func); 367 368 /* 369 * Returns the user_ptr set with dmu_buf_set_user(), or NULL if not set. 370 */ 371 void *dmu_buf_get_user(dmu_buf_t *db); 372 373 /* 374 * Indicate that you are going to modify the buffer's data (db_data). 375 * 376 * The transaction (tx) must be assigned to a txg (ie. you've called 377 * dmu_tx_assign()). The buffer's object must be held in the tx 378 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)). 379 */ 380 void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx); 381 382 /* 383 * You must create a transaction, then hold the objects which you will 384 * (or might) modify as part of this transaction. Then you must assign 385 * the transaction to a transaction group. Once the transaction has 386 * been assigned, you can modify buffers which belong to held objects as 387 * part of this transaction. You can't modify buffers before the 388 * transaction has been assigned; you can't modify buffers which don't 389 * belong to objects which this transaction holds; you can't hold 390 * objects once the transaction has been assigned. You may hold an 391 * object which you are going to free (with dmu_object_free()), but you 392 * don't have to. 393 * 394 * You can abort the transaction before it has been assigned. 395 * 396 * Note that you may hold buffers (with dmu_buf_hold) at any time, 397 * regardless of transaction state. 398 */ 399 400 #define DMU_NEW_OBJECT (-1ULL) 401 #define DMU_OBJECT_END (-1ULL) 402 403 dmu_tx_t *dmu_tx_create(objset_t *os); 404 void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len); 405 void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off, 406 uint64_t len); 407 void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, char *name); 408 void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object); 409 void dmu_tx_abort(dmu_tx_t *tx); 410 int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how); 411 void dmu_tx_wait(dmu_tx_t *tx); 412 void dmu_tx_commit(dmu_tx_t *tx); 413 414 /* 415 * Free up the data blocks for a defined range of a file. If size is 416 * zero, the range from offset to end-of-file is freed. 417 */ 418 int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset, 419 uint64_t size, dmu_tx_t *tx); 420 421 /* 422 * Convenience functions. 423 * 424 * Canfail routines will return 0 on success, or an errno if there is a 425 * nonrecoverable I/O error. 426 */ 427 int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 428 void *buf); 429 void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 430 const void *buf, dmu_tx_t *tx); 431 int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size); 432 int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size, 433 dmu_tx_t *tx); 434 int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, 435 uint64_t size, struct page *pp, dmu_tx_t *tx); 436 437 extern int zfs_prefetch_disable; 438 439 /* 440 * Asynchronously try to read in the data. 441 */ 442 void dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, 443 uint64_t len); 444 445 typedef struct dmu_object_info { 446 /* All sizes are in bytes. */ 447 uint32_t doi_data_block_size; 448 uint32_t doi_metadata_block_size; 449 uint64_t doi_bonus_size; 450 dmu_object_type_t doi_type; 451 dmu_object_type_t doi_bonus_type; 452 uint8_t doi_indirection; /* 2 = dnode->indirect->data */ 453 uint8_t doi_checksum; 454 uint8_t doi_compress; 455 uint8_t doi_pad[5]; 456 /* Values below are number of 512-byte blocks. */ 457 uint64_t doi_physical_blks; /* data + metadata */ 458 uint64_t doi_max_block_offset; 459 } dmu_object_info_t; 460 461 typedef struct dmu_object_type_info { 462 dmu_byteswap_func_t *ot_byteswap; 463 boolean_t ot_metadata; 464 char *ot_name; 465 } dmu_object_type_info_t; 466 467 extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES]; 468 469 /* 470 * Get information on a DMU object. 471 * 472 * Return 0 on success or ENOENT if object is not allocated. 473 * 474 * If doi is NULL, just indicates whether the object exists. 475 */ 476 int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi); 477 void dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi); 478 void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi); 479 void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize, 480 u_longlong_t *nblk512); 481 482 typedef struct dmu_objset_stats { 483 uint64_t dds_num_clones; /* number of clones of this */ 484 uint64_t dds_creation_txg; 485 dmu_objset_type_t dds_type; 486 uint8_t dds_is_snapshot; 487 uint8_t dds_inconsistent; 488 char dds_clone_of[MAXNAMELEN]; 489 } dmu_objset_stats_t; 490 491 /* 492 * Get stats on a dataset. 493 */ 494 void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat); 495 496 /* 497 * Add entries to the nvlist for all the objset's properties. See 498 * zfs_prop_table[] and zfs(1m) for details on the properties. 499 */ 500 void dmu_objset_stats(objset_t *os, struct nvlist *nv); 501 502 /* 503 * Get the space usage statistics for statvfs(). 504 * 505 * refdbytes is the amount of space "referenced" by this objset. 506 * availbytes is the amount of space available to this objset, taking 507 * into account quotas & reservations, assuming that no other objsets 508 * use the space first. These values correspond to the 'referenced' and 509 * 'available' properties, described in the zfs(1m) manpage. 510 * 511 * usedobjs and availobjs are the number of objects currently allocated, 512 * and available. 513 */ 514 void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 515 uint64_t *usedobjsp, uint64_t *availobjsp); 516 517 /* 518 * The fsid_guid is a 56-bit ID that can change to avoid collisions. 519 * (Contrast with the ds_guid which is a 64-bit ID that will never 520 * change, so there is a small probability that it will collide.) 521 */ 522 uint64_t dmu_objset_fsid_guid(objset_t *os); 523 524 int dmu_objset_is_snapshot(objset_t *os); 525 526 extern struct spa *dmu_objset_spa(objset_t *os); 527 extern struct zilog *dmu_objset_zil(objset_t *os); 528 extern struct dsl_pool *dmu_objset_pool(objset_t *os); 529 extern struct dsl_dataset *dmu_objset_ds(objset_t *os); 530 extern void dmu_objset_name(objset_t *os, char *buf); 531 extern dmu_objset_type_t dmu_objset_type(objset_t *os); 532 extern uint64_t dmu_objset_id(objset_t *os); 533 extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 534 uint64_t *id, uint64_t *offp); 535 extern int dmu_dir_list_next(objset_t *os, int namelen, char *name, 536 uint64_t *idp, uint64_t *offp); 537 538 /* 539 * Return the txg number for the given assigned transaction. 540 */ 541 uint64_t dmu_tx_get_txg(dmu_tx_t *tx); 542 543 /* 544 * Synchronous write. 545 * If a parent zio is provided this function initiates a write on the 546 * provided buffer as a child of the parent zio. 547 * In the absense of a parent zio, the write is completed synchronously. 548 * At write completion, blk is filled with the bp of the written block. 549 * Note that while the data covered by this function will be on stable 550 * storage when the write completes this new data does not become a 551 * permanent part of the file until the associated transaction commits. 552 */ 553 typedef void dmu_sync_cb_t(dmu_buf_t *db, void *arg); 554 int dmu_sync(struct zio *zio, dmu_buf_t *db, 555 struct blkptr *bp, uint64_t txg, dmu_sync_cb_t *done, void *arg); 556 557 /* 558 * Find the next hole or data block in file starting at *off 559 * Return found offset in *off. Return ESRCH for end of file. 560 */ 561 int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, 562 uint64_t *off); 563 564 /* 565 * Initial setup and final teardown. 566 */ 567 extern void dmu_init(void); 568 extern void dmu_fini(void); 569 570 typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp, 571 uint64_t object, uint64_t offset, int len); 572 void dmu_traverse_objset(objset_t *os, uint64_t txg_start, 573 dmu_traverse_cb_t cb, void *arg); 574 575 int dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, struct vnode *vp); 576 int dmu_recvbackup(char *tosnap, struct drr_begin *drrb, uint64_t *sizep, 577 boolean_t force, struct vnode *vp, uint64_t voffset); 578 579 /* CRC64 table */ 580 #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */ 581 extern uint64_t zfs_crc64_table[256]; 582 583 #ifdef __cplusplus 584 } 585 #endif 586 587 #endif /* _SYS_DMU_H */ 588