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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _SYS_DMU_H 28 #define _SYS_DMU_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * This file describes the interface that the DMU provides for its 34 * consumers. 35 * 36 * The DMU also interacts with the SPA. That interface is described in 37 * dmu_spa.h. 38 */ 39 40 #include <sys/inttypes.h> 41 #include <sys/types.h> 42 #include <sys/param.h> 43 44 #ifdef __cplusplus 45 extern "C" { 46 #endif 47 48 struct uio; 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 61 typedef struct objset objset_t; 62 typedef struct dmu_tx dmu_tx_t; 63 typedef struct dsl_dir dsl_dir_t; 64 65 typedef enum dmu_object_type { 66 DMU_OT_NONE, 67 /* general: */ 68 DMU_OT_OBJECT_DIRECTORY, /* ZAP */ 69 DMU_OT_OBJECT_ARRAY, /* UINT64 */ 70 DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */ 71 DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */ 72 DMU_OT_BPLIST, /* UINT64 */ 73 DMU_OT_BPLIST_HDR, /* UINT64 */ 74 /* spa: */ 75 DMU_OT_SPACE_MAP_HEADER, /* UINT64 */ 76 DMU_OT_SPACE_MAP, /* UINT64 */ 77 /* zil: */ 78 DMU_OT_INTENT_LOG, /* UINT64 */ 79 /* dmu: */ 80 DMU_OT_DNODE, /* DNODE */ 81 DMU_OT_OBJSET, /* OBJSET */ 82 /* dsl: */ 83 DMU_OT_DSL_DIR, /* UINT64 */ 84 DMU_OT_DSL_DIR_CHILD_MAP, /* ZAP */ 85 DMU_OT_DSL_DS_SNAP_MAP, /* ZAP */ 86 DMU_OT_DSL_PROPS, /* ZAP */ 87 DMU_OT_DSL_DATASET, /* UINT64 */ 88 /* zpl: */ 89 DMU_OT_ZNODE, /* ZNODE */ 90 DMU_OT_ACL, /* ACL */ 91 DMU_OT_PLAIN_FILE_CONTENTS, /* UINT8 */ 92 DMU_OT_DIRECTORY_CONTENTS, /* ZAP */ 93 DMU_OT_MASTER_NODE, /* ZAP */ 94 DMU_OT_DELETE_QUEUE, /* ZAP */ 95 /* zvol: */ 96 DMU_OT_ZVOL, /* UINT8 */ 97 DMU_OT_ZVOL_PROP, /* ZAP */ 98 /* other; for testing only! */ 99 DMU_OT_PLAIN_OTHER, /* UINT8 */ 100 DMU_OT_UINT64_OTHER, /* UINT64 */ 101 DMU_OT_ZAP_OTHER, /* ZAP */ 102 103 DMU_OT_NUMTYPES 104 } dmu_object_type_t; 105 106 typedef enum dmu_objset_type { 107 DMU_OST_NONE, 108 DMU_OST_META, 109 DMU_OST_ZFS, 110 DMU_OST_ZVOL, 111 DMU_OST_OTHER, /* For testing only! */ 112 DMU_OST_ANY, /* Be careful! */ 113 DMU_OST_NUMTYPES 114 } dmu_objset_type_t; 115 116 void byteswap_uint64_array(void *buf, size_t size); 117 void byteswap_uint32_array(void *buf, size_t size); 118 void byteswap_uint16_array(void *buf, size_t size); 119 void byteswap_uint8_array(void *buf, size_t size); 120 void zap_byteswap(void *buf, size_t size); 121 void zfs_acl_byteswap(void *buf, size_t size); 122 void zfs_znode_byteswap(void *buf, size_t size); 123 124 #define DS_MODE_NONE 0 /* invalid, to aid debugging */ 125 #define DS_MODE_STANDARD 1 /* normal access, no special needs */ 126 #define DS_MODE_PRIMARY 2 /* the "main" access, e.g. a mount */ 127 #define DS_MODE_EXCLUSIVE 3 /* exclusive access, e.g. to destroy */ 128 #define DS_MODE_LEVELS 4 129 #define DS_MODE_LEVEL(x) ((x) & (DS_MODE_LEVELS - 1)) 130 #define DS_MODE_READONLY 0x8 131 #define DS_MODE_IS_READONLY(x) ((x) & DS_MODE_READONLY) 132 #define DS_MODE_RESTORE 0x10 133 #define DS_MODE_IS_RESTORE(x) ((x) & DS_MODE_RESTORE) 134 135 #define DS_FIND_SNAPSHOTS 0x01 136 137 /* 138 * The maximum number of bytes that can be accessed as part of one 139 * operation, including metadata. 140 */ 141 #define DMU_MAX_ACCESS (10<<20) /* 10MB */ 142 143 /* 144 * Public routines to create, destroy, open, and close objsets. 145 */ 146 int dmu_objset_open(const char *name, dmu_objset_type_t type, int mode, 147 objset_t **osp); 148 void dmu_objset_close(objset_t *os); 149 int dmu_objset_create(const char *name, dmu_objset_type_t type, 150 objset_t *clone_parent, 151 void (*func)(objset_t *os, void *arg, dmu_tx_t *tx), void *arg); 152 int dmu_objset_destroy(const char *name); 153 int dmu_objset_rollback(const char *name); 154 int dmu_objset_rename(const char *name, const char *newname); 155 void dmu_objset_set_quota(objset_t *os, uint64_t quota); 156 uint64_t dmu_objset_get_quota(objset_t *os); 157 int dmu_objset_request_reservation(objset_t *os, uint64_t reservation); 158 void dmu_objset_find(char *name, void func(char *, void *), void *arg, 159 int flags); 160 void dmu_objset_byteswap(void *buf, size_t size); 161 162 typedef struct dmu_buf { 163 uint64_t db_object; /* object that this buffer is part of */ 164 uint64_t db_offset; /* byte offset in this object */ 165 uint64_t db_size; /* size of buffer in bytes */ 166 void *db_data; /* data in buffer */ 167 } dmu_buf_t; 168 169 typedef void dmu_buf_evict_func_t(struct dmu_buf *db, void *user_ptr); 170 171 /* 172 * Callback function to perform byte swapping on a block. 173 */ 174 typedef void dmu_byteswap_func_t(void *buf, size_t size); 175 176 #define DMU_POOL_DIRECTORY_OBJECT 1 177 #define DMU_POOL_CONFIG "config" 178 #define DMU_POOL_ROOT_DATASET "root_dataset" 179 #define DMU_POOL_SYNC_BPLIST "sync_bplist" 180 181 /* 182 * Allocate an object from this objset. The range of object numbers 183 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode. 184 * 185 * The transaction must be assigned to a txg. The newly allocated 186 * object will be "held" in the transaction (ie. you can modify the 187 * newly allocated object in this transaction). 188 * 189 * dmu_object_alloc() chooses an object and returns it in *objectp. 190 * 191 * dmu_object_claim() allocates a specific object number. If that 192 * number is already allocated, it fails and returns EEXIST. 193 * 194 * Return 0 on success, or ENOSPC or EEXIST as specified above. 195 */ 196 uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot, 197 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 198 int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 199 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 200 int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 201 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 202 203 /* 204 * Free an object from this objset. 205 * 206 * The object's data will be freed as well (ie. you don't need to call 207 * dmu_free(object, 0, -1, tx)). 208 * 209 * The object need not be held in the transaction. 210 * 211 * If there are any holds on this object's buffers (via dmu_buf_hold()), 212 * or tx holds on the object (via dmu_tx_hold_object()), you can not 213 * free it; it fails and returns EBUSY. 214 * 215 * If the object is not allocated, it fails and returns ENOENT. 216 * 217 * Return 0 on success, or EBUSY or ENOENT as specified above. 218 */ 219 int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx); 220 221 /* 222 * Find the next allocated or free object. 223 * 224 * The objectp parameter is in-out. It will be updated to be the next 225 * object which is allocated. 226 * 227 * XXX Can only be called on a objset with no dirty data. 228 * 229 * Returns 0 on success, or ENOENT if there are no more objects. 230 */ 231 int dmu_object_next(objset_t *os, uint64_t *objectp, boolean_t hole); 232 233 /* 234 * Set the data blocksize for an object. 235 * 236 * The object cannot have any blocks allcated beyond the first. If 237 * the first block is allocated already, the new size must be greater 238 * than the current block size. If these conditions are not met, 239 * ENOTSUP will be returned. 240 * 241 * Returns 0 on success, or EBUSY if there are any holds on the object 242 * contents, or ENOTSUP as described above. 243 */ 244 int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, 245 int ibs, dmu_tx_t *tx); 246 247 /* 248 * Set the checksum property on a dnode. The new checksum algorithm will 249 * apply to all newly written blocks; existing blocks will not be affected. 250 */ 251 void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum, 252 dmu_tx_t *tx); 253 254 /* 255 * Set the compress property on a dnode. The new compression algorithm will 256 * apply to all newly written blocks; existing blocks will not be affected. 257 */ 258 void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress, 259 dmu_tx_t *tx); 260 261 /* 262 * The bonus data is accessed more or less like a regular buffer. 263 * You must dmu_bonus_hold() to get the buffer, which will give you a 264 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus 265 * data. As with any normal buffer, you must call dmu_buf_read() to 266 * read db_data, dmu_buf_will_dirty() before modifying it, and the 267 * object must be held in an assigned transaction before calling 268 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus 269 * buffer as well. You must release your hold with dmu_buf_rele(). 270 */ 271 dmu_buf_t *dmu_bonus_hold(objset_t *os, uint64_t object); 272 dmu_buf_t *dmu_bonus_hold_tag(objset_t *os, uint64_t object, void *tag); 273 int dmu_bonus_max(void); 274 275 /* 276 * Obtain the DMU buffer from the specified object which contains the 277 * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so 278 * that it will remain in memory. You must release the hold with 279 * dmu_buf_rele(). You musn't access the dmu_buf_t after releasing your 280 * hold. You must have a hold on any dmu_buf_t* you pass to the DMU. 281 * 282 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill 283 * on the returned buffer before reading or writing the buffer's 284 * db_data. The comments for those routines describe what particular 285 * operations are valid after calling them. 286 * 287 * The object number must be a valid, allocated object number. 288 */ 289 dmu_buf_t *dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset); 290 void dmu_buf_add_ref(dmu_buf_t *db, void* tag); 291 void dmu_buf_remove_ref(dmu_buf_t *db, void* tag); 292 void dmu_buf_rele(dmu_buf_t *db); 293 void dmu_buf_rele_tag(dmu_buf_t *db, void *tag); 294 uint64_t dmu_buf_refcount(dmu_buf_t *db); 295 296 /* 297 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a 298 * range of an object. A pointer to an array of dmu_buf_t*'s is 299 * returned (in *dbpp). 300 * 301 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and 302 * frees the array. The hold on the array of buffers MUST be released 303 * with dmu_buf_rele_array. You can NOT release the hold on each buffer 304 * individually with dmu_buf_rele. 305 */ 306 dmu_buf_t **dmu_buf_hold_array(objset_t *os, uint64_t object, 307 uint64_t offset, uint64_t length, int *numbufs); 308 void dmu_buf_rele_array(dmu_buf_t **, int numbufs); 309 310 /* 311 * Returns NULL on success, or the existing user ptr if it's already 312 * been set. 313 * 314 * user_ptr is for use by the user and can be obtained via dmu_buf_get_user(). 315 * 316 * user_data_ptr_ptr should be NULL, or a pointer to a pointer which 317 * will be set to db->db_data when you are allowed to access it. Note 318 * that db->db_data (the pointer) can change when you do dmu_buf_read(), 319 * dmu_buf_tryupgrade(), dmu_buf_will_dirty(), or dmu_buf_will_fill(). 320 * *user_data_ptr_ptr will be set to the new value when it changes. 321 * 322 * If non-NULL, pageout func will be called when this buffer is being 323 * excised from the cache, so that you can clean up the data structure 324 * pointed to by user_ptr. 325 * 326 * dmu_evict_user() will call the pageout func for all buffers in a 327 * objset with a given pageout func. 328 */ 329 void *dmu_buf_set_user(dmu_buf_t *db, void *user_ptr, void *user_data_ptr_ptr, 330 dmu_buf_evict_func_t *pageout_func); 331 /* 332 * set_user_ie is the same as set_user, but request immediate eviction 333 * when hold count goes to zero. 334 */ 335 void *dmu_buf_set_user_ie(dmu_buf_t *db, void *user_ptr, 336 void *user_data_ptr_ptr, dmu_buf_evict_func_t *pageout_func); 337 void *dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr, 338 void *user_ptr, void *user_data_ptr_ptr, 339 dmu_buf_evict_func_t *pageout_func); 340 void dmu_evict_user(objset_t *os, dmu_buf_evict_func_t *func); 341 342 void dmu_buf_hold_data(dmu_buf_t *db); 343 void dmu_buf_rele_data(dmu_buf_t *db); 344 345 /* 346 * Returns the user_ptr set with dmu_buf_set_user(), or NULL if not set. 347 */ 348 void *dmu_buf_get_user(dmu_buf_t *db); 349 350 /* 351 * Indicate that you are going to read the buffer's data (db_data). 352 * 353 * This routine will read the data from disk if necessary. 354 * 355 * These routines will return 0 on success, or an errno if there is a 356 * nonrecoverable I/O error. 357 */ 358 void dmu_buf_read(dmu_buf_t *db); 359 int dmu_buf_read_canfail(dmu_buf_t *db); 360 void dmu_buf_read_array(dmu_buf_t **dbp, int numbufs); 361 int dmu_buf_read_array_canfail(dmu_buf_t **dbp, int numbufs); 362 363 /* 364 * Indicate that you are going to modify the buffer's data (db_data). 365 * 366 * The transaction (tx) must be assigned to a txg (ie. you've called 367 * dmu_tx_assign()). The buffer's object must be held in the tx 368 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)). 369 */ 370 void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx); 371 372 /* 373 * Indicate that you are going to modify the entire contents of the 374 * buffer's data ("fill" it). 375 * 376 * This routine is the same as dmu_buf_will_dirty, except that it won't 377 * read the contents off the disk, so the contents may be uninitialized 378 * and you must overwrite it. 379 * 380 * The transaction (tx) must be assigned to a txg (ie. you've called 381 * dmu_tx_assign()). The buffer's object must be held in the tx (ie. 382 * you've called dmu_tx_hold_object(tx, db->db_object)). 383 */ 384 /* void dmu_buf_will_fill(dmu_buf_t *db, dmu_tx_t *tx); */ 385 386 /* 387 * You must create a transaction, then hold the objects which you will 388 * (or might) modify as part of this transaction. Then you must assign 389 * the transaction to a transaction group. Once the transaction has 390 * been assigned, you can modify buffers which belong to held objects as 391 * part of this transaction. You can't modify buffers before the 392 * transaction has been assigned; you can't modify buffers which don't 393 * belong to objects which this transaction holds; you can't hold 394 * objects once the transaction has been assigned. You may hold an 395 * object which you are going to free (with dmu_object_free()), but you 396 * don't have to. 397 * 398 * You can abort the transaction before it has been assigned. 399 * 400 * Note that you may hold buffers (with dmu_buf_hold) at any time, 401 * regardless of transaction state. 402 */ 403 404 #define DMU_NEW_OBJECT (-1ULL) 405 #define DMU_OBJECT_END (-1ULL) 406 407 dmu_tx_t *dmu_tx_create(objset_t *os); 408 void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len); 409 void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off, 410 uint64_t len); 411 void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int ops); 412 void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object); 413 void dmu_tx_abort(dmu_tx_t *tx); 414 int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how); 415 void dmu_tx_commit(dmu_tx_t *tx); 416 417 /* 418 * Free up the data blocks for a defined range of a file. If size is 419 * zero, the range from offset to end-of-file is freed. 420 */ 421 void dmu_free_range(objset_t *os, uint64_t object, uint64_t offset, 422 uint64_t size, dmu_tx_t *tx); 423 424 /* 425 * Convenience functions. 426 * 427 * Canfail routines will return 0 on success, or an errno if there is a 428 * nonrecoverable I/O error. 429 */ 430 void dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 431 void *buf); 432 int dmu_read_canfail(objset_t *dd, uint64_t object, uint64_t offset, 433 uint64_t size, 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_write_uio(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 437 struct uio *uio, dmu_tx_t *tx); 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 /* 483 * Get the maximum nonzero offset in the object (ie. this offset and all 484 * offsets following are zero). 485 * 486 * XXX Perhaps integrate this with dmu_object_info(), although that 487 * would then have to bring in the indirect blocks. 488 */ 489 uint64_t dmu_object_max_nonzero_offset(objset_t *os, uint64_t object); 490 491 typedef struct dmu_objset_stats { 492 dmu_objset_type_t dds_type; 493 uint8_t dds_is_snapshot; 494 uint8_t dds_is_placeholder; 495 uint8_t dds_pad[2]; 496 497 uint64_t dds_creation_time; 498 uint64_t dds_creation_txg; 499 500 char dds_clone_of[MAXNAMELEN]; 501 502 /* How much data is there in this objset? */ 503 504 /* 505 * Space referenced, taking into account pending writes and 506 * frees. Only relavent to filesystems and snapshots (not 507 * collections). 508 */ 509 uint64_t dds_space_refd; 510 511 /* 512 * Space "used", taking into account pending writes and frees, and 513 * children's reservations (in bytes). This is the amount of 514 * space that will be freed if this and all dependent items are 515 * destroyed (eg. child datasets, objsets, and snapshots). So 516 * for snapshots, this is the amount of space unique to this 517 * snapshot. 518 */ 519 uint64_t dds_space_used; 520 521 /* 522 * Compressed and uncompressed bytes consumed. Does not take 523 * into account reservations. Used for computing compression 524 * ratio. 525 */ 526 uint64_t dds_compressed_bytes; 527 uint64_t dds_uncompressed_bytes; 528 529 /* 530 * The ds_fsid_guid is a 56-bit ID that can change to avoid 531 * collisions. The ds_guid is a 64-bit ID that will never 532 * change, so there is a small probability that it will collide. 533 */ 534 uint64_t dds_fsid_guid; 535 uint64_t dds_guid; 536 537 uint64_t dds_objects_used; /* number of objects used */ 538 uint64_t dds_objects_avail; /* number of objects available */ 539 540 uint64_t dds_num_clones; /* number of clones of this */ 541 542 /* The dataset's administratively-set quota, in bytes. */ 543 uint64_t dds_quota; 544 545 /* The dataset's administratively-set reservation, in bytes */ 546 uint64_t dds_reserved; 547 548 /* 549 * The amount of additional space that this dataset can consume. 550 * Takes into account quotas & reservations. 551 * (Assuming that no other datasets consume it first.) 552 */ 553 uint64_t dds_available; 554 555 /* 556 * Miscellaneous 557 */ 558 char dds_altroot[MAXPATHLEN]; 559 560 /* The following are for debugging purposes only */ 561 uint64_t dds_last_txg; 562 uint64_t dds_dir_obj; 563 uint64_t dds_objset_obj; 564 uint64_t dds_clone_of_obj; 565 } dmu_objset_stats_t; 566 567 /* 568 * Get stats on a dataset. 569 */ 570 void dmu_objset_stats(objset_t *os, dmu_objset_stats_t *dds); 571 572 int dmu_objset_is_snapshot(objset_t *os); 573 574 extern struct spa *dmu_objset_spa(objset_t *os); 575 extern struct zilog *dmu_objset_zil(objset_t *os); 576 extern struct dsl_pool *dmu_objset_pool(objset_t *os); 577 extern struct dsl_dataset *dmu_objset_ds(objset_t *os); 578 extern void dmu_objset_name(objset_t *os, char *buf); 579 extern dmu_objset_type_t dmu_objset_type(objset_t *os); 580 extern uint64_t dmu_objset_id(objset_t *os); 581 extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 582 uint64_t *id, uint64_t *offp); 583 extern int dmu_dir_list_next(objset_t *os, int namelen, char *name, 584 uint64_t *idp, uint64_t *offp); 585 586 /* 587 * Return the txg number for the given assigned transaction. 588 */ 589 uint64_t dmu_tx_get_txg(dmu_tx_t *tx); 590 591 /* 592 * Synchronous write. 593 * On success returns 0 and fills in the blk pointed at by bp. 594 * Note that while the data covered by this function will be on stable 595 * storage when the function returns this new data does not become a 596 * permanent part of the file until the associated transaction commits. 597 */ 598 int dmu_sync(objset_t *os, uint64_t object, uint64_t offset, uint64_t *blkoff, 599 struct blkptr *bp, uint64_t txg); 600 601 /* 602 * Find the next hole or data block in file starting at *off 603 * Return found offset in *off. Return ESRCH for end of file. 604 */ 605 int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, 606 uint64_t *off); 607 608 /* 609 * Initial setup and final teardown. 610 */ 611 extern void dmu_init(void); 612 extern void dmu_fini(void); 613 614 typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp, 615 uint64_t object, uint64_t offset, int len); 616 void dmu_traverse_objset(objset_t *os, uint64_t txg_start, 617 dmu_traverse_cb_t cb, void *arg); 618 619 int dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, struct vnode *vp); 620 int dmu_recvbackup(struct drr_begin *drrb, uint64_t *sizep, 621 struct vnode *vp, uint64_t voffset); 622 623 /* CRC64 table */ 624 #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */ 625 extern uint64_t zfs_crc64_table[256]; 626 627 #ifdef __cplusplus 628 } 629 #endif 630 631 #endif /* _SYS_DMU_H */ 632