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 #include <sys/cred.h> 43 44 #ifdef __cplusplus 45 extern "C" { 46 #endif 47 48 struct uio; 49 struct page; 50 struct vnode; 51 struct spa; 52 struct zilog; 53 struct zio; 54 struct blkptr; 55 struct zap_cursor; 56 struct dsl_dataset; 57 struct dsl_pool; 58 struct dnode; 59 struct drr_begin; 60 struct drr_end; 61 struct zbookmark; 62 struct spa; 63 struct nvlist; 64 struct objset_impl; 65 66 typedef struct objset objset_t; 67 typedef struct dmu_tx dmu_tx_t; 68 typedef struct dsl_dir dsl_dir_t; 69 70 typedef enum dmu_object_type { 71 DMU_OT_NONE, 72 /* general: */ 73 DMU_OT_OBJECT_DIRECTORY, /* ZAP */ 74 DMU_OT_OBJECT_ARRAY, /* UINT64 */ 75 DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */ 76 DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */ 77 DMU_OT_BPLIST, /* UINT64 */ 78 DMU_OT_BPLIST_HDR, /* UINT64 */ 79 /* spa: */ 80 DMU_OT_SPACE_MAP_HEADER, /* UINT64 */ 81 DMU_OT_SPACE_MAP, /* UINT64 */ 82 /* zil: */ 83 DMU_OT_INTENT_LOG, /* UINT64 */ 84 /* dmu: */ 85 DMU_OT_DNODE, /* DNODE */ 86 DMU_OT_OBJSET, /* OBJSET */ 87 /* dsl: */ 88 DMU_OT_DSL_DIR, /* UINT64 */ 89 DMU_OT_DSL_DIR_CHILD_MAP, /* ZAP */ 90 DMU_OT_DSL_DS_SNAP_MAP, /* ZAP */ 91 DMU_OT_DSL_PROPS, /* ZAP */ 92 DMU_OT_DSL_DATASET, /* UINT64 */ 93 /* zpl: */ 94 DMU_OT_ZNODE, /* ZNODE */ 95 DMU_OT_OLDACL, /* Old ACL */ 96 DMU_OT_PLAIN_FILE_CONTENTS, /* UINT8 */ 97 DMU_OT_DIRECTORY_CONTENTS, /* ZAP */ 98 DMU_OT_MASTER_NODE, /* ZAP */ 99 DMU_OT_UNLINKED_SET, /* ZAP */ 100 /* zvol: */ 101 DMU_OT_ZVOL, /* UINT8 */ 102 DMU_OT_ZVOL_PROP, /* ZAP */ 103 /* other; for testing only! */ 104 DMU_OT_PLAIN_OTHER, /* UINT8 */ 105 DMU_OT_UINT64_OTHER, /* UINT64 */ 106 DMU_OT_ZAP_OTHER, /* ZAP */ 107 /* new object types: */ 108 DMU_OT_ERROR_LOG, /* ZAP */ 109 DMU_OT_SPA_HISTORY, /* UINT8 */ 110 DMU_OT_SPA_HISTORY_OFFSETS, /* spa_his_phys_t */ 111 DMU_OT_POOL_PROPS, /* ZAP */ 112 DMU_OT_DSL_PERMS, /* ZAP */ 113 DMU_OT_ACL, /* ACL */ 114 DMU_OT_SYSACL, /* SYSACL */ 115 DMU_OT_FUID, /* FUID table (Packed NVLIST UINT8) */ 116 DMU_OT_FUID_SIZE, /* FUID table size UINT64 */ 117 DMU_OT_NUMTYPES 118 } dmu_object_type_t; 119 120 typedef enum dmu_objset_type { 121 DMU_OST_NONE, 122 DMU_OST_META, 123 DMU_OST_ZFS, 124 DMU_OST_ZVOL, 125 DMU_OST_OTHER, /* For testing only! */ 126 DMU_OST_ANY, /* Be careful! */ 127 DMU_OST_NUMTYPES 128 } dmu_objset_type_t; 129 130 void byteswap_uint64_array(void *buf, size_t size); 131 void byteswap_uint32_array(void *buf, size_t size); 132 void byteswap_uint16_array(void *buf, size_t size); 133 void byteswap_uint8_array(void *buf, size_t size); 134 void zap_byteswap(void *buf, size_t size); 135 void zfs_oldacl_byteswap(void *buf, size_t size); 136 void zfs_acl_byteswap(void *buf, size_t size); 137 void zfs_znode_byteswap(void *buf, size_t size); 138 139 #define DS_MODE_NONE 0 /* invalid, to aid debugging */ 140 #define DS_MODE_STANDARD 1 /* normal access, no special needs */ 141 #define DS_MODE_PRIMARY 2 /* the "main" access, e.g. a mount */ 142 #define DS_MODE_EXCLUSIVE 3 /* exclusive access, e.g. to destroy */ 143 #define DS_MODE_LEVELS 4 144 #define DS_MODE_LEVEL(x) ((x) & (DS_MODE_LEVELS - 1)) 145 #define DS_MODE_READONLY 0x8 146 #define DS_MODE_IS_READONLY(x) ((x) & DS_MODE_READONLY) 147 #define DS_MODE_INCONSISTENT 0x10 148 #define DS_MODE_IS_INCONSISTENT(x) ((x) & DS_MODE_INCONSISTENT) 149 150 #define DS_FIND_SNAPSHOTS (1<<0) 151 #define DS_FIND_CHILDREN (1<<1) 152 153 /* 154 * The maximum number of bytes that can be accessed as part of one 155 * operation, including metadata. 156 */ 157 #define DMU_MAX_ACCESS (10<<20) /* 10MB */ 158 159 /* 160 * Public routines to create, destroy, open, and close objsets. 161 */ 162 int dmu_objset_open(const char *name, dmu_objset_type_t type, int mode, 163 objset_t **osp); 164 int dmu_objset_open_ds(struct dsl_dataset *ds, dmu_objset_type_t type, 165 objset_t **osp); 166 void dmu_objset_close(objset_t *os); 167 int dmu_objset_evict_dbufs(objset_t *os); 168 int dmu_objset_create(const char *name, dmu_objset_type_t type, 169 objset_t *clone_parent, 170 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg); 171 int dmu_objset_destroy(const char *name); 172 int dmu_snapshots_destroy(char *fsname, char *snapname); 173 int dmu_objset_rollback(objset_t *os); 174 int dmu_objset_snapshot(char *fsname, char *snapname, boolean_t recursive); 175 int dmu_objset_rename(const char *name, const char *newname, 176 boolean_t recursive); 177 int dmu_objset_find(char *name, int func(char *, void *), void *arg, 178 int flags); 179 void dmu_objset_byteswap(void *buf, size_t size); 180 181 typedef struct dmu_buf { 182 uint64_t db_object; /* object that this buffer is part of */ 183 uint64_t db_offset; /* byte offset in this object */ 184 uint64_t db_size; /* size of buffer in bytes */ 185 void *db_data; /* data in buffer */ 186 } dmu_buf_t; 187 188 typedef void dmu_buf_evict_func_t(struct dmu_buf *db, void *user_ptr); 189 190 /* 191 * The names of zap entries in the DIRECTORY_OBJECT of the MOS. 192 */ 193 #define DMU_POOL_DIRECTORY_OBJECT 1 194 #define DMU_POOL_CONFIG "config" 195 #define DMU_POOL_ROOT_DATASET "root_dataset" 196 #define DMU_POOL_SYNC_BPLIST "sync_bplist" 197 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub" 198 #define DMU_POOL_ERRLOG_LAST "errlog_last" 199 #define DMU_POOL_SPARES "spares" 200 #define DMU_POOL_DEFLATE "deflate" 201 #define DMU_POOL_HISTORY "history" 202 #define DMU_POOL_PROPS "pool_props" 203 #define DMU_POOL_L2CACHE "l2cache" 204 205 /* 206 * Allocate an object from this objset. The range of object numbers 207 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode. 208 * 209 * The transaction must be assigned to a txg. The newly allocated 210 * object will be "held" in the transaction (ie. you can modify the 211 * newly allocated object in this transaction). 212 * 213 * dmu_object_alloc() chooses an object and returns it in *objectp. 214 * 215 * dmu_object_claim() allocates a specific object number. If that 216 * number is already allocated, it fails and returns EEXIST. 217 * 218 * Return 0 on success, or ENOSPC or EEXIST as specified above. 219 */ 220 uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot, 221 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 222 int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 223 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 224 int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 225 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 226 227 /* 228 * Free an object from this objset. 229 * 230 * The object's data will be freed as well (ie. you don't need to call 231 * dmu_free(object, 0, -1, tx)). 232 * 233 * The object need not be held in the transaction. 234 * 235 * If there are any holds on this object's buffers (via dmu_buf_hold()), 236 * or tx holds on the object (via dmu_tx_hold_object()), you can not 237 * free it; it fails and returns EBUSY. 238 * 239 * If the object is not allocated, it fails and returns ENOENT. 240 * 241 * Return 0 on success, or EBUSY or ENOENT as specified above. 242 */ 243 int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx); 244 245 /* 246 * Find the next allocated or free object. 247 * 248 * The objectp parameter is in-out. It will be updated to be the next 249 * object which is allocated. Ignore objects which have not been 250 * modified since txg. 251 * 252 * XXX Can only be called on a objset with no dirty data. 253 * 254 * Returns 0 on success, or ENOENT if there are no more objects. 255 */ 256 int dmu_object_next(objset_t *os, uint64_t *objectp, 257 boolean_t hole, uint64_t txg); 258 259 /* 260 * Set the data blocksize for an object. 261 * 262 * The object cannot have any blocks allcated beyond the first. If 263 * the first block is allocated already, the new size must be greater 264 * than the current block size. If these conditions are not met, 265 * ENOTSUP will be returned. 266 * 267 * Returns 0 on success, or EBUSY if there are any holds on the object 268 * contents, or ENOTSUP as described above. 269 */ 270 int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, 271 int ibs, dmu_tx_t *tx); 272 273 /* 274 * Set the checksum property on a dnode. The new checksum algorithm will 275 * apply to all newly written blocks; existing blocks will not be affected. 276 */ 277 void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum, 278 dmu_tx_t *tx); 279 280 /* 281 * Set the compress property on a dnode. The new compression algorithm will 282 * apply to all newly written blocks; existing blocks will not be affected. 283 */ 284 void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress, 285 dmu_tx_t *tx); 286 287 /* 288 * Decide how many copies of a given block we should make. Can be from 289 * 1 to SPA_DVAS_PER_BP. 290 */ 291 int dmu_get_replication_level(struct objset_impl *, struct zbookmark *zb, 292 dmu_object_type_t ot); 293 /* 294 * The bonus data is accessed more or less like a regular buffer. 295 * You must dmu_bonus_hold() to get the buffer, which will give you a 296 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus 297 * data. As with any normal buffer, you must call dmu_buf_read() to 298 * read db_data, dmu_buf_will_dirty() before modifying it, and the 299 * object must be held in an assigned transaction before calling 300 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus 301 * buffer as well. You must release your hold with dmu_buf_rele(). 302 */ 303 int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **); 304 int dmu_bonus_max(void); 305 int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *); 306 307 /* 308 * Obtain the DMU buffer from the specified object which contains the 309 * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so 310 * that it will remain in memory. You must release the hold with 311 * dmu_buf_rele(). You musn't access the dmu_buf_t after releasing your 312 * hold. You must have a hold on any dmu_buf_t* you pass to the DMU. 313 * 314 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill 315 * on the returned buffer before reading or writing the buffer's 316 * db_data. The comments for those routines describe what particular 317 * operations are valid after calling them. 318 * 319 * The object number must be a valid, allocated object number. 320 */ 321 int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset, 322 void *tag, dmu_buf_t **); 323 void dmu_buf_add_ref(dmu_buf_t *db, void* tag); 324 void dmu_buf_rele(dmu_buf_t *db, void *tag); 325 uint64_t dmu_buf_refcount(dmu_buf_t *db); 326 327 /* 328 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a 329 * range of an object. A pointer to an array of dmu_buf_t*'s is 330 * returned (in *dbpp). 331 * 332 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and 333 * frees the array. The hold on the array of buffers MUST be released 334 * with dmu_buf_rele_array. You can NOT release the hold on each buffer 335 * individually with dmu_buf_rele. 336 */ 337 int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset, 338 uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp); 339 void dmu_buf_rele_array(dmu_buf_t **, int numbufs, void *tag); 340 341 /* 342 * Returns NULL on success, or the existing user ptr if it's already 343 * been set. 344 * 345 * user_ptr is for use by the user and can be obtained via dmu_buf_get_user(). 346 * 347 * user_data_ptr_ptr should be NULL, or a pointer to a pointer which 348 * will be set to db->db_data when you are allowed to access it. Note 349 * that db->db_data (the pointer) can change when you do dmu_buf_read(), 350 * dmu_buf_tryupgrade(), dmu_buf_will_dirty(), or dmu_buf_will_fill(). 351 * *user_data_ptr_ptr will be set to the new value when it changes. 352 * 353 * If non-NULL, pageout func will be called when this buffer is being 354 * excised from the cache, so that you can clean up the data structure 355 * pointed to by user_ptr. 356 * 357 * dmu_evict_user() will call the pageout func for all buffers in a 358 * objset with a given pageout func. 359 */ 360 void *dmu_buf_set_user(dmu_buf_t *db, void *user_ptr, void *user_data_ptr_ptr, 361 dmu_buf_evict_func_t *pageout_func); 362 /* 363 * set_user_ie is the same as set_user, but request immediate eviction 364 * when hold count goes to zero. 365 */ 366 void *dmu_buf_set_user_ie(dmu_buf_t *db, void *user_ptr, 367 void *user_data_ptr_ptr, dmu_buf_evict_func_t *pageout_func); 368 void *dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, 369 void *user_ptr, void *user_data_ptr_ptr, 370 dmu_buf_evict_func_t *pageout_func); 371 void dmu_evict_user(objset_t *os, dmu_buf_evict_func_t *func); 372 373 /* 374 * Returns the user_ptr set with dmu_buf_set_user(), or NULL if not set. 375 */ 376 void *dmu_buf_get_user(dmu_buf_t *db); 377 378 /* 379 * Indicate that you are going to modify the buffer's data (db_data). 380 * 381 * The transaction (tx) must be assigned to a txg (ie. you've called 382 * dmu_tx_assign()). The buffer's object must be held in the tx 383 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)). 384 */ 385 void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx); 386 387 /* 388 * You must create a transaction, then hold the objects which you will 389 * (or might) modify as part of this transaction. Then you must assign 390 * the transaction to a transaction group. Once the transaction has 391 * been assigned, you can modify buffers which belong to held objects as 392 * part of this transaction. You can't modify buffers before the 393 * transaction has been assigned; you can't modify buffers which don't 394 * belong to objects which this transaction holds; you can't hold 395 * objects once the transaction has been assigned. You may hold an 396 * object which you are going to free (with dmu_object_free()), but you 397 * don't have to. 398 * 399 * You can abort the transaction before it has been assigned. 400 * 401 * Note that you may hold buffers (with dmu_buf_hold) at any time, 402 * regardless of transaction state. 403 */ 404 405 #define DMU_NEW_OBJECT (-1ULL) 406 #define DMU_OBJECT_END (-1ULL) 407 408 dmu_tx_t *dmu_tx_create(objset_t *os); 409 void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len); 410 void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off, 411 uint64_t len); 412 void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, char *name); 413 void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object); 414 void dmu_tx_abort(dmu_tx_t *tx); 415 int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how); 416 void dmu_tx_wait(dmu_tx_t *tx); 417 void dmu_tx_commit(dmu_tx_t *tx); 418 419 /* 420 * Free up the data blocks for a defined range of a file. If size is 421 * zero, the range from offset to end-of-file is freed. 422 */ 423 int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset, 424 uint64_t size, dmu_tx_t *tx); 425 426 /* 427 * Convenience functions. 428 * 429 * Canfail routines will return 0 on success, or an errno if there is a 430 * nonrecoverable I/O error. 431 */ 432 int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 433 void *buf); 434 void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 435 const void *buf, dmu_tx_t *tx); 436 int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size); 437 int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size, 438 dmu_tx_t *tx); 439 int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, 440 uint64_t size, struct page *pp, dmu_tx_t *tx); 441 442 extern int zfs_prefetch_disable; 443 444 /* 445 * Asynchronously try to read in the data. 446 */ 447 void dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, 448 uint64_t len); 449 450 typedef struct dmu_object_info { 451 /* All sizes are in bytes. */ 452 uint32_t doi_data_block_size; 453 uint32_t doi_metadata_block_size; 454 uint64_t doi_bonus_size; 455 dmu_object_type_t doi_type; 456 dmu_object_type_t doi_bonus_type; 457 uint8_t doi_indirection; /* 2 = dnode->indirect->data */ 458 uint8_t doi_checksum; 459 uint8_t doi_compress; 460 uint8_t doi_pad[5]; 461 /* Values below are number of 512-byte blocks. */ 462 uint64_t doi_physical_blks; /* data + metadata */ 463 uint64_t doi_max_block_offset; 464 } dmu_object_info_t; 465 466 typedef void arc_byteswap_func_t(void *buf, size_t size); 467 468 typedef struct dmu_object_type_info { 469 arc_byteswap_func_t *ot_byteswap; 470 boolean_t ot_metadata; 471 char *ot_name; 472 } dmu_object_type_info_t; 473 474 extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES]; 475 476 /* 477 * Get information on a DMU object. 478 * 479 * Return 0 on success or ENOENT if object is not allocated. 480 * 481 * If doi is NULL, just indicates whether the object exists. 482 */ 483 int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi); 484 void dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi); 485 void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi); 486 void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize, 487 u_longlong_t *nblk512); 488 489 typedef struct dmu_objset_stats { 490 uint64_t dds_num_clones; /* number of clones of this */ 491 uint64_t dds_creation_txg; 492 uint64_t dds_guid; 493 dmu_objset_type_t dds_type; 494 uint8_t dds_is_snapshot; 495 uint8_t dds_inconsistent; 496 char dds_origin[MAXNAMELEN]; 497 } dmu_objset_stats_t; 498 499 /* 500 * Get stats on a dataset. 501 */ 502 void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat); 503 504 /* 505 * Add entries to the nvlist for all the objset's properties. See 506 * zfs_prop_table[] and zfs(1m) for details on the properties. 507 */ 508 void dmu_objset_stats(objset_t *os, struct nvlist *nv); 509 510 /* 511 * Get the space usage statistics for statvfs(). 512 * 513 * refdbytes is the amount of space "referenced" by this objset. 514 * availbytes is the amount of space available to this objset, taking 515 * into account quotas & reservations, assuming that no other objsets 516 * use the space first. These values correspond to the 'referenced' and 517 * 'available' properties, described in the zfs(1m) manpage. 518 * 519 * usedobjs and availobjs are the number of objects currently allocated, 520 * and available. 521 */ 522 void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 523 uint64_t *usedobjsp, uint64_t *availobjsp); 524 525 /* 526 * The fsid_guid is a 56-bit ID that can change to avoid collisions. 527 * (Contrast with the ds_guid which is a 64-bit ID that will never 528 * change, so there is a small probability that it will collide.) 529 */ 530 uint64_t dmu_objset_fsid_guid(objset_t *os); 531 532 int dmu_objset_is_snapshot(objset_t *os); 533 534 extern struct spa *dmu_objset_spa(objset_t *os); 535 extern struct zilog *dmu_objset_zil(objset_t *os); 536 extern struct dsl_pool *dmu_objset_pool(objset_t *os); 537 extern struct dsl_dataset *dmu_objset_ds(objset_t *os); 538 extern void dmu_objset_name(objset_t *os, char *buf); 539 extern dmu_objset_type_t dmu_objset_type(objset_t *os); 540 extern uint64_t dmu_objset_id(objset_t *os); 541 extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 542 uint64_t *id, uint64_t *offp); 543 extern int dmu_dir_list_next(objset_t *os, int namelen, char *name, 544 uint64_t *idp, uint64_t *offp); 545 extern void dmu_objset_set_user(objset_t *os, void *user_ptr); 546 extern void *dmu_objset_get_user(objset_t *os); 547 548 /* 549 * Return the txg number for the given assigned transaction. 550 */ 551 uint64_t dmu_tx_get_txg(dmu_tx_t *tx); 552 553 /* 554 * Synchronous write. 555 * If a parent zio is provided this function initiates a write on the 556 * provided buffer as a child of the parent zio. 557 * In the absence of a parent zio, the write is completed synchronously. 558 * At write completion, blk is filled with the bp of the written block. 559 * Note that while the data covered by this function will be on stable 560 * storage when the write completes this new data does not become a 561 * permanent part of the file until the associated transaction commits. 562 */ 563 typedef void dmu_sync_cb_t(dmu_buf_t *db, void *arg); 564 int dmu_sync(struct zio *zio, dmu_buf_t *db, 565 struct blkptr *bp, uint64_t txg, dmu_sync_cb_t *done, void *arg); 566 567 /* 568 * Find the next hole or data block in file starting at *off 569 * Return found offset in *off. Return ESRCH for end of file. 570 */ 571 int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, 572 uint64_t *off); 573 574 /* 575 * Initial setup and final teardown. 576 */ 577 extern void dmu_init(void); 578 extern void dmu_fini(void); 579 580 typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp, 581 uint64_t object, uint64_t offset, int len); 582 void dmu_traverse_objset(objset_t *os, uint64_t txg_start, 583 dmu_traverse_cb_t cb, void *arg); 584 585 int dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin, 586 struct vnode *vp, offset_t *off); 587 588 typedef struct dmu_recv_cookie { 589 /* 590 * This structure is opaque! 591 * 592 * If logical and real are different, we are recving the stream 593 * into the "real" temporary clone, and then switching it with 594 * the "logical" target. 595 */ 596 struct dsl_dataset *drc_logical_ds; 597 struct dsl_dataset *drc_real_ds; 598 struct drr_begin *drc_drrb; 599 char *drc_tosnap; 600 boolean_t drc_newfs; 601 boolean_t drc_force; 602 } dmu_recv_cookie_t; 603 604 int dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *, 605 boolean_t force, objset_t *origin, boolean_t online, dmu_recv_cookie_t *); 606 int dmu_recv_stream(dmu_recv_cookie_t *drc, struct vnode *vp, offset_t *voffp); 607 int dmu_recv_end(dmu_recv_cookie_t *drc); 608 609 /* CRC64 table */ 610 #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */ 611 extern uint64_t zfs_crc64_table[256]; 612 613 #ifdef __cplusplus 614 } 615 #endif 616 617 #endif /* _SYS_DMU_H */ 618