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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2011, 2020 by Delphix. All rights reserved. 24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 25 * Copyright (c) 2012, Joyent, Inc. All rights reserved. 26 * Copyright 2014 HybridCluster. All rights reserved. 27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 28 * Copyright 2013 Saso Kiselkov. All rights reserved. 29 * Copyright (c) 2017, Intel Corporation. 30 */ 31 32 /* Portions Copyright 2010 Robert Milkowski */ 33 34 #ifndef _SYS_DMU_H 35 #define _SYS_DMU_H 36 37 /* 38 * This file describes the interface that the DMU provides for its 39 * consumers. 40 * 41 * The DMU also interacts with the SPA. That interface is described in 42 * dmu_spa.h. 43 */ 44 45 #include <sys/zfs_context.h> 46 #include <sys/inttypes.h> 47 #include <sys/cred.h> 48 #include <sys/fs/zfs.h> 49 #include <sys/zio_compress.h> 50 #include <sys/zio_priority.h> 51 #include <sys/uio.h> 52 #include <sys/zfs_file.h> 53 54 #ifdef __cplusplus 55 extern "C" { 56 #endif 57 58 struct page; 59 struct vnode; 60 struct spa; 61 struct zilog; 62 struct zio; 63 struct blkptr; 64 struct zap_cursor; 65 struct dsl_dataset; 66 struct dsl_pool; 67 struct dnode; 68 struct drr_begin; 69 struct drr_end; 70 struct zbookmark_phys; 71 struct spa; 72 struct nvlist; 73 struct arc_buf; 74 struct zio_prop; 75 struct sa_handle; 76 struct dsl_crypto_params; 77 struct locked_range; 78 79 typedef struct objset objset_t; 80 typedef struct dmu_tx dmu_tx_t; 81 typedef struct dsl_dir dsl_dir_t; 82 typedef struct dnode dnode_t; 83 84 typedef enum dmu_object_byteswap { 85 DMU_BSWAP_UINT8, 86 DMU_BSWAP_UINT16, 87 DMU_BSWAP_UINT32, 88 DMU_BSWAP_UINT64, 89 DMU_BSWAP_ZAP, 90 DMU_BSWAP_DNODE, 91 DMU_BSWAP_OBJSET, 92 DMU_BSWAP_ZNODE, 93 DMU_BSWAP_OLDACL, 94 DMU_BSWAP_ACL, 95 /* 96 * Allocating a new byteswap type number makes the on-disk format 97 * incompatible with any other format that uses the same number. 98 * 99 * Data can usually be structured to work with one of the 100 * DMU_BSWAP_UINT* or DMU_BSWAP_ZAP types. 101 */ 102 DMU_BSWAP_NUMFUNCS 103 } dmu_object_byteswap_t; 104 105 #define DMU_OT_NEWTYPE 0x80 106 #define DMU_OT_METADATA 0x40 107 #define DMU_OT_ENCRYPTED 0x20 108 #define DMU_OT_BYTESWAP_MASK 0x1f 109 110 /* 111 * Defines a uint8_t object type. Object types specify if the data 112 * in the object is metadata (boolean) and how to byteswap the data 113 * (dmu_object_byteswap_t). All of the types created by this method 114 * are cached in the dbuf metadata cache. 115 */ 116 #define DMU_OT(byteswap, metadata, encrypted) \ 117 (DMU_OT_NEWTYPE | \ 118 ((metadata) ? DMU_OT_METADATA : 0) | \ 119 ((encrypted) ? DMU_OT_ENCRYPTED : 0) | \ 120 ((byteswap) & DMU_OT_BYTESWAP_MASK)) 121 122 #define DMU_OT_IS_VALID(ot) (((ot) & DMU_OT_NEWTYPE) ? \ 123 ((ot) & DMU_OT_BYTESWAP_MASK) < DMU_BSWAP_NUMFUNCS : \ 124 (ot) < DMU_OT_NUMTYPES) 125 126 #define DMU_OT_IS_METADATA_CACHED(ot) (((ot) & DMU_OT_NEWTYPE) ? \ 127 B_TRUE : dmu_ot[(ot)].ot_dbuf_metadata_cache) 128 129 /* 130 * MDB doesn't have dmu_ot; it defines these macros itself. 131 */ 132 #ifndef ZFS_MDB 133 #define DMU_OT_IS_METADATA_IMPL(ot) (dmu_ot[ot].ot_metadata) 134 #define DMU_OT_IS_ENCRYPTED_IMPL(ot) (dmu_ot[ot].ot_encrypt) 135 #define DMU_OT_BYTESWAP_IMPL(ot) (dmu_ot[ot].ot_byteswap) 136 #endif 137 138 #define DMU_OT_IS_METADATA(ot) (((ot) & DMU_OT_NEWTYPE) ? \ 139 ((ot) & DMU_OT_METADATA) : \ 140 DMU_OT_IS_METADATA_IMPL(ot)) 141 142 #define DMU_OT_IS_DDT(ot) \ 143 ((ot) == DMU_OT_DDT_ZAP) 144 145 #define DMU_OT_IS_ZIL(ot) \ 146 ((ot) == DMU_OT_INTENT_LOG) 147 148 /* Note: ztest uses DMU_OT_UINT64_OTHER as a proxy for file blocks */ 149 #define DMU_OT_IS_FILE(ot) \ 150 ((ot) == DMU_OT_PLAIN_FILE_CONTENTS || (ot) == DMU_OT_UINT64_OTHER) 151 152 #define DMU_OT_IS_ENCRYPTED(ot) (((ot) & DMU_OT_NEWTYPE) ? \ 153 ((ot) & DMU_OT_ENCRYPTED) : \ 154 DMU_OT_IS_ENCRYPTED_IMPL(ot)) 155 156 /* 157 * These object types use bp_fill != 1 for their L0 bp's. Therefore they can't 158 * have their data embedded (i.e. use a BP_IS_EMBEDDED() bp), because bp_fill 159 * is repurposed for embedded BPs. 160 */ 161 #define DMU_OT_HAS_FILL(ot) \ 162 ((ot) == DMU_OT_DNODE || (ot) == DMU_OT_OBJSET) 163 164 #define DMU_OT_BYTESWAP(ot) (((ot) & DMU_OT_NEWTYPE) ? \ 165 ((ot) & DMU_OT_BYTESWAP_MASK) : \ 166 DMU_OT_BYTESWAP_IMPL(ot)) 167 168 typedef enum dmu_object_type { 169 DMU_OT_NONE, 170 /* general: */ 171 DMU_OT_OBJECT_DIRECTORY, /* ZAP */ 172 DMU_OT_OBJECT_ARRAY, /* UINT64 */ 173 DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */ 174 DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */ 175 DMU_OT_BPOBJ, /* UINT64 */ 176 DMU_OT_BPOBJ_HDR, /* UINT64 */ 177 /* spa: */ 178 DMU_OT_SPACE_MAP_HEADER, /* UINT64 */ 179 DMU_OT_SPACE_MAP, /* UINT64 */ 180 /* zil: */ 181 DMU_OT_INTENT_LOG, /* UINT64 */ 182 /* dmu: */ 183 DMU_OT_DNODE, /* DNODE */ 184 DMU_OT_OBJSET, /* OBJSET */ 185 /* dsl: */ 186 DMU_OT_DSL_DIR, /* UINT64 */ 187 DMU_OT_DSL_DIR_CHILD_MAP, /* ZAP */ 188 DMU_OT_DSL_DS_SNAP_MAP, /* ZAP */ 189 DMU_OT_DSL_PROPS, /* ZAP */ 190 DMU_OT_DSL_DATASET, /* UINT64 */ 191 /* zpl: */ 192 DMU_OT_ZNODE, /* ZNODE */ 193 DMU_OT_OLDACL, /* Old ACL */ 194 DMU_OT_PLAIN_FILE_CONTENTS, /* UINT8 */ 195 DMU_OT_DIRECTORY_CONTENTS, /* ZAP */ 196 DMU_OT_MASTER_NODE, /* ZAP */ 197 DMU_OT_UNLINKED_SET, /* ZAP */ 198 /* zvol: */ 199 DMU_OT_ZVOL, /* UINT8 */ 200 DMU_OT_ZVOL_PROP, /* ZAP */ 201 /* other; for testing only! */ 202 DMU_OT_PLAIN_OTHER, /* UINT8 */ 203 DMU_OT_UINT64_OTHER, /* UINT64 */ 204 DMU_OT_ZAP_OTHER, /* ZAP */ 205 /* new object types: */ 206 DMU_OT_ERROR_LOG, /* ZAP */ 207 DMU_OT_SPA_HISTORY, /* UINT8 */ 208 DMU_OT_SPA_HISTORY_OFFSETS, /* spa_his_phys_t */ 209 DMU_OT_POOL_PROPS, /* ZAP */ 210 DMU_OT_DSL_PERMS, /* ZAP */ 211 DMU_OT_ACL, /* ACL */ 212 DMU_OT_SYSACL, /* SYSACL */ 213 DMU_OT_FUID, /* FUID table (Packed NVLIST UINT8) */ 214 DMU_OT_FUID_SIZE, /* FUID table size UINT64 */ 215 DMU_OT_NEXT_CLONES, /* ZAP */ 216 DMU_OT_SCAN_QUEUE, /* ZAP */ 217 DMU_OT_USERGROUP_USED, /* ZAP */ 218 DMU_OT_USERGROUP_QUOTA, /* ZAP */ 219 DMU_OT_USERREFS, /* ZAP */ 220 DMU_OT_DDT_ZAP, /* ZAP */ 221 DMU_OT_DDT_STATS, /* ZAP */ 222 DMU_OT_SA, /* System attr */ 223 DMU_OT_SA_MASTER_NODE, /* ZAP */ 224 DMU_OT_SA_ATTR_REGISTRATION, /* ZAP */ 225 DMU_OT_SA_ATTR_LAYOUTS, /* ZAP */ 226 DMU_OT_SCAN_XLATE, /* ZAP */ 227 DMU_OT_DEDUP, /* fake dedup BP from ddt_bp_create() */ 228 DMU_OT_DEADLIST, /* ZAP */ 229 DMU_OT_DEADLIST_HDR, /* UINT64 */ 230 DMU_OT_DSL_CLONES, /* ZAP */ 231 DMU_OT_BPOBJ_SUBOBJ, /* UINT64 */ 232 /* 233 * Do not allocate new object types here. Doing so makes the on-disk 234 * format incompatible with any other format that uses the same object 235 * type number. 236 * 237 * When creating an object which does not have one of the above types 238 * use the DMU_OTN_* type with the correct byteswap and metadata 239 * values. 240 * 241 * The DMU_OTN_* types do not have entries in the dmu_ot table, 242 * use the DMU_OT_IS_METADATA() and DMU_OT_BYTESWAP() macros instead 243 * of indexing into dmu_ot directly (this works for both DMU_OT_* types 244 * and DMU_OTN_* types). 245 */ 246 DMU_OT_NUMTYPES, 247 248 /* 249 * Names for valid types declared with DMU_OT(). 250 */ 251 DMU_OTN_UINT8_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE, B_FALSE), 252 DMU_OTN_UINT8_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE, B_FALSE), 253 DMU_OTN_UINT16_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE, B_FALSE), 254 DMU_OTN_UINT16_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE, B_FALSE), 255 DMU_OTN_UINT32_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE, B_FALSE), 256 DMU_OTN_UINT32_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE, B_FALSE), 257 DMU_OTN_UINT64_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE, B_FALSE), 258 DMU_OTN_UINT64_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE, B_FALSE), 259 DMU_OTN_ZAP_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE, B_FALSE), 260 DMU_OTN_ZAP_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE, B_FALSE), 261 262 DMU_OTN_UINT8_ENC_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE, B_TRUE), 263 DMU_OTN_UINT8_ENC_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE, B_TRUE), 264 DMU_OTN_UINT16_ENC_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE, B_TRUE), 265 DMU_OTN_UINT16_ENC_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE, B_TRUE), 266 DMU_OTN_UINT32_ENC_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE, B_TRUE), 267 DMU_OTN_UINT32_ENC_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE, B_TRUE), 268 DMU_OTN_UINT64_ENC_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE, B_TRUE), 269 DMU_OTN_UINT64_ENC_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE, B_TRUE), 270 DMU_OTN_ZAP_ENC_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE, B_TRUE), 271 DMU_OTN_ZAP_ENC_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE, B_TRUE), 272 } dmu_object_type_t; 273 274 /* 275 * These flags are intended to be used to specify the "txg_how" 276 * parameter when calling the dmu_tx_assign() function. See the comment 277 * above dmu_tx_assign() for more details on the meaning of these flags. 278 */ 279 #define TXG_NOWAIT (0ULL) 280 #define TXG_WAIT (1ULL<<0) 281 #define TXG_NOTHROTTLE (1ULL<<1) 282 283 void byteswap_uint64_array(void *buf, size_t size); 284 void byteswap_uint32_array(void *buf, size_t size); 285 void byteswap_uint16_array(void *buf, size_t size); 286 void byteswap_uint8_array(void *buf, size_t size); 287 void zap_byteswap(void *buf, size_t size); 288 void zfs_oldacl_byteswap(void *buf, size_t size); 289 void zfs_acl_byteswap(void *buf, size_t size); 290 void zfs_znode_byteswap(void *buf, size_t size); 291 292 #define DS_FIND_SNAPSHOTS (1<<0) 293 #define DS_FIND_CHILDREN (1<<1) 294 #define DS_FIND_SERIALIZE (1<<2) 295 296 /* 297 * The maximum number of bytes that can be accessed as part of one 298 * operation, including metadata. 299 */ 300 #define DMU_MAX_ACCESS (64 * 1024 * 1024) /* 64MB */ 301 #define DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */ 302 303 #define DMU_USERUSED_OBJECT (-1ULL) 304 #define DMU_GROUPUSED_OBJECT (-2ULL) 305 #define DMU_PROJECTUSED_OBJECT (-3ULL) 306 307 /* 308 * Zap prefix for object accounting in DMU_{USER,GROUP,PROJECT}USED_OBJECT. 309 */ 310 #define DMU_OBJACCT_PREFIX "obj-" 311 #define DMU_OBJACCT_PREFIX_LEN 4 312 313 /* 314 * artificial blkids for bonus buffer and spill blocks 315 */ 316 #define DMU_BONUS_BLKID (-1ULL) 317 #define DMU_SPILL_BLKID (-2ULL) 318 319 /* 320 * Public routines to create, destroy, open, and close objsets. 321 */ 322 typedef void dmu_objset_create_sync_func_t(objset_t *os, void *arg, 323 cred_t *cr, dmu_tx_t *tx); 324 325 int dmu_objset_hold(const char *name, void *tag, objset_t **osp); 326 int dmu_objset_own(const char *name, dmu_objset_type_t type, 327 boolean_t readonly, boolean_t key_required, void *tag, objset_t **osp); 328 void dmu_objset_rele(objset_t *os, void *tag); 329 void dmu_objset_disown(objset_t *os, boolean_t key_required, void *tag); 330 int dmu_objset_open_ds(struct dsl_dataset *ds, objset_t **osp); 331 332 void dmu_objset_evict_dbufs(objset_t *os); 333 int dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, 334 struct dsl_crypto_params *dcp, dmu_objset_create_sync_func_t func, 335 void *arg); 336 int dmu_objset_clone(const char *name, const char *origin); 337 int dsl_destroy_snapshots_nvl(struct nvlist *snaps, boolean_t defer, 338 struct nvlist *errlist); 339 int dmu_objset_snapshot_one(const char *fsname, const char *snapname); 340 int dmu_objset_find(const char *name, int func(const char *, void *), void *arg, 341 int flags); 342 void dmu_objset_byteswap(void *buf, size_t size); 343 int dsl_dataset_rename_snapshot(const char *fsname, 344 const char *oldsnapname, const char *newsnapname, boolean_t recursive); 345 346 typedef struct dmu_buf { 347 uint64_t db_object; /* object that this buffer is part of */ 348 uint64_t db_offset; /* byte offset in this object */ 349 uint64_t db_size; /* size of buffer in bytes */ 350 void *db_data; /* data in buffer */ 351 } dmu_buf_t; 352 353 /* 354 * The names of zap entries in the DIRECTORY_OBJECT of the MOS. 355 */ 356 #define DMU_POOL_DIRECTORY_OBJECT 1 357 #define DMU_POOL_CONFIG "config" 358 #define DMU_POOL_FEATURES_FOR_WRITE "features_for_write" 359 #define DMU_POOL_FEATURES_FOR_READ "features_for_read" 360 #define DMU_POOL_FEATURE_DESCRIPTIONS "feature_descriptions" 361 #define DMU_POOL_FEATURE_ENABLED_TXG "feature_enabled_txg" 362 #define DMU_POOL_ROOT_DATASET "root_dataset" 363 #define DMU_POOL_SYNC_BPOBJ "sync_bplist" 364 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub" 365 #define DMU_POOL_ERRLOG_LAST "errlog_last" 366 #define DMU_POOL_SPARES "spares" 367 #define DMU_POOL_DEFLATE "deflate" 368 #define DMU_POOL_HISTORY "history" 369 #define DMU_POOL_PROPS "pool_props" 370 #define DMU_POOL_L2CACHE "l2cache" 371 #define DMU_POOL_TMP_USERREFS "tmp_userrefs" 372 #define DMU_POOL_DDT "DDT-%s-%s-%s" 373 #define DMU_POOL_DDT_STATS "DDT-statistics" 374 #define DMU_POOL_CREATION_VERSION "creation_version" 375 #define DMU_POOL_SCAN "scan" 376 #define DMU_POOL_FREE_BPOBJ "free_bpobj" 377 #define DMU_POOL_BPTREE_OBJ "bptree_obj" 378 #define DMU_POOL_EMPTY_BPOBJ "empty_bpobj" 379 #define DMU_POOL_CHECKSUM_SALT "org.illumos:checksum_salt" 380 #define DMU_POOL_VDEV_ZAP_MAP "com.delphix:vdev_zap_map" 381 #define DMU_POOL_REMOVING "com.delphix:removing" 382 #define DMU_POOL_OBSOLETE_BPOBJ "com.delphix:obsolete_bpobj" 383 #define DMU_POOL_CONDENSING_INDIRECT "com.delphix:condensing_indirect" 384 #define DMU_POOL_ZPOOL_CHECKPOINT "com.delphix:zpool_checkpoint" 385 #define DMU_POOL_LOG_SPACEMAP_ZAP "com.delphix:log_spacemap_zap" 386 #define DMU_POOL_DELETED_CLONES "com.delphix:deleted_clones" 387 388 /* 389 * Allocate an object from this objset. The range of object numbers 390 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode. 391 * 392 * The transaction must be assigned to a txg. The newly allocated 393 * object will be "held" in the transaction (ie. you can modify the 394 * newly allocated object in this transaction). 395 * 396 * dmu_object_alloc() chooses an object and returns it in *objectp. 397 * 398 * dmu_object_claim() allocates a specific object number. If that 399 * number is already allocated, it fails and returns EEXIST. 400 * 401 * Return 0 on success, or ENOSPC or EEXIST as specified above. 402 */ 403 uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot, 404 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 405 uint64_t dmu_object_alloc_ibs(objset_t *os, dmu_object_type_t ot, int blocksize, 406 int indirect_blockshift, 407 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx); 408 uint64_t dmu_object_alloc_dnsize(objset_t *os, dmu_object_type_t ot, 409 int blocksize, dmu_object_type_t bonus_type, int bonus_len, 410 int dnodesize, dmu_tx_t *tx); 411 uint64_t dmu_object_alloc_hold(objset_t *os, dmu_object_type_t ot, 412 int blocksize, int indirect_blockshift, dmu_object_type_t bonustype, 413 int bonuslen, int dnodesize, dnode_t **allocated_dnode, void *tag, 414 dmu_tx_t *tx); 415 int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, 416 int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); 417 int dmu_object_claim_dnsize(objset_t *os, uint64_t object, dmu_object_type_t ot, 418 int blocksize, dmu_object_type_t bonus_type, int bonus_len, 419 int dnodesize, dmu_tx_t *tx); 420 int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, 421 int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *txp); 422 int dmu_object_reclaim_dnsize(objset_t *os, uint64_t object, 423 dmu_object_type_t ot, int blocksize, dmu_object_type_t bonustype, 424 int bonuslen, int dnodesize, boolean_t keep_spill, dmu_tx_t *tx); 425 int dmu_object_rm_spill(objset_t *os, uint64_t object, dmu_tx_t *tx); 426 427 /* 428 * Free an object from this objset. 429 * 430 * The object's data will be freed as well (ie. you don't need to call 431 * dmu_free(object, 0, -1, tx)). 432 * 433 * The object need not be held in the transaction. 434 * 435 * If there are any holds on this object's buffers (via dmu_buf_hold()), 436 * or tx holds on the object (via dmu_tx_hold_object()), you can not 437 * free it; it fails and returns EBUSY. 438 * 439 * If the object is not allocated, it fails and returns ENOENT. 440 * 441 * Return 0 on success, or EBUSY or ENOENT as specified above. 442 */ 443 int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx); 444 445 /* 446 * Find the next allocated or free object. 447 * 448 * The objectp parameter is in-out. It will be updated to be the next 449 * object which is allocated. Ignore objects which have not been 450 * modified since txg. 451 * 452 * XXX Can only be called on a objset with no dirty data. 453 * 454 * Returns 0 on success, or ENOENT if there are no more objects. 455 */ 456 int dmu_object_next(objset_t *os, uint64_t *objectp, 457 boolean_t hole, uint64_t txg); 458 459 /* 460 * Set the number of levels on a dnode. nlevels must be greater than the 461 * current number of levels or an EINVAL will be returned. 462 */ 463 int dmu_object_set_nlevels(objset_t *os, uint64_t object, int nlevels, 464 dmu_tx_t *tx); 465 466 /* 467 * Set the data blocksize for an object. 468 * 469 * The object cannot have any blocks allocated beyond the first. If 470 * the first block is allocated already, the new size must be greater 471 * than the current block size. If these conditions are not met, 472 * ENOTSUP will be returned. 473 * 474 * Returns 0 on success, or EBUSY if there are any holds on the object 475 * contents, or ENOTSUP as described above. 476 */ 477 int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, 478 int ibs, dmu_tx_t *tx); 479 480 /* 481 * Manually set the maxblkid on a dnode. This will adjust nlevels accordingly 482 * to accommodate the change. When calling this function, the caller must 483 * ensure that the object's nlevels can sufficiently support the new maxblkid. 484 */ 485 int dmu_object_set_maxblkid(objset_t *os, uint64_t object, uint64_t maxblkid, 486 dmu_tx_t *tx); 487 488 /* 489 * Set the checksum property on a dnode. The new checksum algorithm will 490 * apply to all newly written blocks; existing blocks will not be affected. 491 */ 492 void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum, 493 dmu_tx_t *tx); 494 495 /* 496 * Set the compress property on a dnode. The new compression algorithm will 497 * apply to all newly written blocks; existing blocks will not be affected. 498 */ 499 void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress, 500 dmu_tx_t *tx); 501 502 void dmu_write_embedded(objset_t *os, uint64_t object, uint64_t offset, 503 void *data, uint8_t etype, uint8_t comp, int uncompressed_size, 504 int compressed_size, int byteorder, dmu_tx_t *tx); 505 void dmu_redact(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 506 dmu_tx_t *tx); 507 508 /* 509 * Decide how to write a block: checksum, compression, number of copies, etc. 510 */ 511 #define WP_NOFILL 0x1 512 #define WP_DMU_SYNC 0x2 513 #define WP_SPILL 0x4 514 515 void dmu_write_policy(objset_t *os, dnode_t *dn, int level, int wp, 516 struct zio_prop *zp); 517 518 /* 519 * The bonus data is accessed more or less like a regular buffer. 520 * You must dmu_bonus_hold() to get the buffer, which will give you a 521 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus 522 * data. As with any normal buffer, you must call dmu_buf_will_dirty() 523 * before modifying it, and the 524 * object must be held in an assigned transaction before calling 525 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus 526 * buffer as well. You must release what you hold with dmu_buf_rele(). 527 * 528 * Returns ENOENT, EIO, or 0. 529 */ 530 int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **dbp); 531 int dmu_bonus_hold_by_dnode(dnode_t *dn, void *tag, dmu_buf_t **dbp, 532 uint32_t flags); 533 int dmu_bonus_max(void); 534 int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *); 535 int dmu_set_bonustype(dmu_buf_t *, dmu_object_type_t, dmu_tx_t *); 536 dmu_object_type_t dmu_get_bonustype(dmu_buf_t *); 537 int dmu_rm_spill(objset_t *, uint64_t, dmu_tx_t *); 538 539 /* 540 * Special spill buffer support used by "SA" framework 541 */ 542 543 int dmu_spill_hold_by_bonus(dmu_buf_t *bonus, uint32_t flags, void *tag, 544 dmu_buf_t **dbp); 545 int dmu_spill_hold_by_dnode(dnode_t *dn, uint32_t flags, 546 void *tag, dmu_buf_t **dbp); 547 int dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp); 548 549 /* 550 * Obtain the DMU buffer from the specified object which contains the 551 * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so 552 * that it will remain in memory. You must release the hold with 553 * dmu_buf_rele(). You must not access the dmu_buf_t after releasing 554 * what you hold. You must have a hold on any dmu_buf_t* you pass to the DMU. 555 * 556 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill 557 * on the returned buffer before reading or writing the buffer's 558 * db_data. The comments for those routines describe what particular 559 * operations are valid after calling them. 560 * 561 * The object number must be a valid, allocated object number. 562 */ 563 int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset, 564 void *tag, dmu_buf_t **, int flags); 565 int dmu_buf_hold_by_dnode(dnode_t *dn, uint64_t offset, 566 void *tag, dmu_buf_t **dbp, int flags); 567 int dmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset, 568 uint64_t length, boolean_t read, void *tag, int *numbufsp, 569 dmu_buf_t ***dbpp, uint32_t flags); 570 /* 571 * Add a reference to a dmu buffer that has already been held via 572 * dmu_buf_hold() in the current context. 573 */ 574 void dmu_buf_add_ref(dmu_buf_t *db, void* tag); 575 576 /* 577 * Attempt to add a reference to a dmu buffer that is in an unknown state, 578 * using a pointer that may have been invalidated by eviction processing. 579 * The request will succeed if the passed in dbuf still represents the 580 * same os/object/blkid, is ineligible for eviction, and has at least 581 * one hold by a user other than the syncer. 582 */ 583 boolean_t dmu_buf_try_add_ref(dmu_buf_t *, objset_t *os, uint64_t object, 584 uint64_t blkid, void *tag); 585 586 void dmu_buf_rele(dmu_buf_t *db, void *tag); 587 uint64_t dmu_buf_refcount(dmu_buf_t *db); 588 uint64_t dmu_buf_user_refcount(dmu_buf_t *db); 589 590 /* 591 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a 592 * range of an object. A pointer to an array of dmu_buf_t*'s is 593 * returned (in *dbpp). 594 * 595 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and 596 * frees the array. The hold on the array of buffers MUST be released 597 * with dmu_buf_rele_array. You can NOT release the hold on each buffer 598 * individually with dmu_buf_rele. 599 */ 600 int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset, 601 uint64_t length, boolean_t read, void *tag, 602 int *numbufsp, dmu_buf_t ***dbpp); 603 void dmu_buf_rele_array(dmu_buf_t **, int numbufs, void *tag); 604 605 typedef void dmu_buf_evict_func_t(void *user_ptr); 606 607 /* 608 * A DMU buffer user object may be associated with a dbuf for the 609 * duration of its lifetime. This allows the user of a dbuf (client) 610 * to attach private data to a dbuf (e.g. in-core only data such as a 611 * dnode_children_t, zap_t, or zap_leaf_t) and be optionally notified 612 * when that dbuf has been evicted. Clients typically respond to the 613 * eviction notification by freeing their private data, thus ensuring 614 * the same lifetime for both dbuf and private data. 615 * 616 * The mapping from a dmu_buf_user_t to any client private data is the 617 * client's responsibility. All current consumers of the API with private 618 * data embed a dmu_buf_user_t as the first member of the structure for 619 * their private data. This allows conversions between the two types 620 * with a simple cast. Since the DMU buf user API never needs access 621 * to the private data, other strategies can be employed if necessary 622 * or convenient for the client (e.g. using container_of() to do the 623 * conversion for private data that cannot have the dmu_buf_user_t as 624 * its first member). 625 * 626 * Eviction callbacks are executed without the dbuf mutex held or any 627 * other type of mechanism to guarantee that the dbuf is still available. 628 * For this reason, users must assume the dbuf has already been freed 629 * and not reference the dbuf from the callback context. 630 * 631 * Users requesting "immediate eviction" are notified as soon as the dbuf 632 * is only referenced by dirty records (dirties == holds). Otherwise the 633 * notification occurs after eviction processing for the dbuf begins. 634 */ 635 typedef struct dmu_buf_user { 636 /* 637 * Asynchronous user eviction callback state. 638 */ 639 taskq_ent_t dbu_tqent; 640 641 /* 642 * This instance's eviction function pointers. 643 * 644 * dbu_evict_func_sync is called synchronously and then 645 * dbu_evict_func_async is executed asynchronously on a taskq. 646 */ 647 dmu_buf_evict_func_t *dbu_evict_func_sync; 648 dmu_buf_evict_func_t *dbu_evict_func_async; 649 #ifdef ZFS_DEBUG 650 /* 651 * Pointer to user's dbuf pointer. NULL for clients that do 652 * not associate a dbuf with their user data. 653 * 654 * The dbuf pointer is cleared upon eviction so as to catch 655 * use-after-evict bugs in clients. 656 */ 657 dmu_buf_t **dbu_clear_on_evict_dbufp; 658 #endif 659 } dmu_buf_user_t; 660 661 /* 662 * Initialize the given dmu_buf_user_t instance with the eviction function 663 * evict_func, to be called when the user is evicted. 664 * 665 * NOTE: This function should only be called once on a given dmu_buf_user_t. 666 * To allow enforcement of this, dbu must already be zeroed on entry. 667 */ 668 /*ARGSUSED*/ 669 static inline void 670 dmu_buf_init_user(dmu_buf_user_t *dbu, dmu_buf_evict_func_t *evict_func_sync, 671 dmu_buf_evict_func_t *evict_func_async, 672 dmu_buf_t **clear_on_evict_dbufp __maybe_unused) 673 { 674 ASSERT(dbu->dbu_evict_func_sync == NULL); 675 ASSERT(dbu->dbu_evict_func_async == NULL); 676 677 /* must have at least one evict func */ 678 IMPLY(evict_func_sync == NULL, evict_func_async != NULL); 679 dbu->dbu_evict_func_sync = evict_func_sync; 680 dbu->dbu_evict_func_async = evict_func_async; 681 taskq_init_ent(&dbu->dbu_tqent); 682 #ifdef ZFS_DEBUG 683 dbu->dbu_clear_on_evict_dbufp = clear_on_evict_dbufp; 684 #endif 685 } 686 687 /* 688 * Attach user data to a dbuf and mark it for normal (when the dbuf's 689 * data is cleared or its reference count goes to zero) eviction processing. 690 * 691 * Returns NULL on success, or the existing user if another user currently 692 * owns the buffer. 693 */ 694 void *dmu_buf_set_user(dmu_buf_t *db, dmu_buf_user_t *user); 695 696 /* 697 * Attach user data to a dbuf and mark it for immediate (its dirty and 698 * reference counts are equal) eviction processing. 699 * 700 * Returns NULL on success, or the existing user if another user currently 701 * owns the buffer. 702 */ 703 void *dmu_buf_set_user_ie(dmu_buf_t *db, dmu_buf_user_t *user); 704 705 /* 706 * Replace the current user of a dbuf. 707 * 708 * If given the current user of a dbuf, replaces the dbuf's user with 709 * "new_user" and returns the user data pointer that was replaced. 710 * Otherwise returns the current, and unmodified, dbuf user pointer. 711 */ 712 void *dmu_buf_replace_user(dmu_buf_t *db, 713 dmu_buf_user_t *old_user, dmu_buf_user_t *new_user); 714 715 /* 716 * Remove the specified user data for a DMU buffer. 717 * 718 * Returns the user that was removed on success, or the current user if 719 * another user currently owns the buffer. 720 */ 721 void *dmu_buf_remove_user(dmu_buf_t *db, dmu_buf_user_t *user); 722 723 /* 724 * Returns the user data (dmu_buf_user_t *) associated with this dbuf. 725 */ 726 void *dmu_buf_get_user(dmu_buf_t *db); 727 728 objset_t *dmu_buf_get_objset(dmu_buf_t *db); 729 dnode_t *dmu_buf_dnode_enter(dmu_buf_t *db); 730 void dmu_buf_dnode_exit(dmu_buf_t *db); 731 732 /* Block until any in-progress dmu buf user evictions complete. */ 733 void dmu_buf_user_evict_wait(void); 734 735 /* 736 * Returns the blkptr associated with this dbuf, or NULL if not set. 737 */ 738 struct blkptr *dmu_buf_get_blkptr(dmu_buf_t *db); 739 740 /* 741 * Indicate that you are going to modify the buffer's data (db_data). 742 * 743 * The transaction (tx) must be assigned to a txg (ie. you've called 744 * dmu_tx_assign()). The buffer's object must be held in the tx 745 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)). 746 */ 747 void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx); 748 boolean_t dmu_buf_is_dirty(dmu_buf_t *db, dmu_tx_t *tx); 749 void dmu_buf_set_crypt_params(dmu_buf_t *db_fake, boolean_t byteorder, 750 const uint8_t *salt, const uint8_t *iv, const uint8_t *mac, dmu_tx_t *tx); 751 752 /* 753 * You must create a transaction, then hold the objects which you will 754 * (or might) modify as part of this transaction. Then you must assign 755 * the transaction to a transaction group. Once the transaction has 756 * been assigned, you can modify buffers which belong to held objects as 757 * part of this transaction. You can't modify buffers before the 758 * transaction has been assigned; you can't modify buffers which don't 759 * belong to objects which this transaction holds; you can't hold 760 * objects once the transaction has been assigned. You may hold an 761 * object which you are going to free (with dmu_object_free()), but you 762 * don't have to. 763 * 764 * You can abort the transaction before it has been assigned. 765 * 766 * Note that you may hold buffers (with dmu_buf_hold) at any time, 767 * regardless of transaction state. 768 */ 769 770 #define DMU_NEW_OBJECT (-1ULL) 771 #define DMU_OBJECT_END (-1ULL) 772 773 dmu_tx_t *dmu_tx_create(objset_t *os); 774 void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len); 775 void dmu_tx_hold_write_by_dnode(dmu_tx_t *tx, dnode_t *dn, uint64_t off, 776 int len); 777 void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off, 778 uint64_t len); 779 void dmu_tx_hold_free_by_dnode(dmu_tx_t *tx, dnode_t *dn, uint64_t off, 780 uint64_t len); 781 void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, const char *name); 782 void dmu_tx_hold_zap_by_dnode(dmu_tx_t *tx, dnode_t *dn, int add, 783 const char *name); 784 void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object); 785 void dmu_tx_hold_bonus_by_dnode(dmu_tx_t *tx, dnode_t *dn); 786 void dmu_tx_hold_spill(dmu_tx_t *tx, uint64_t object); 787 void dmu_tx_hold_sa(dmu_tx_t *tx, struct sa_handle *hdl, boolean_t may_grow); 788 void dmu_tx_hold_sa_create(dmu_tx_t *tx, int total_size); 789 void dmu_tx_abort(dmu_tx_t *tx); 790 int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how); 791 void dmu_tx_wait(dmu_tx_t *tx); 792 void dmu_tx_commit(dmu_tx_t *tx); 793 void dmu_tx_mark_netfree(dmu_tx_t *tx); 794 795 /* 796 * To register a commit callback, dmu_tx_callback_register() must be called. 797 * 798 * dcb_data is a pointer to caller private data that is passed on as a 799 * callback parameter. The caller is responsible for properly allocating and 800 * freeing it. 801 * 802 * When registering a callback, the transaction must be already created, but 803 * it cannot be committed or aborted. It can be assigned to a txg or not. 804 * 805 * The callback will be called after the transaction has been safely written 806 * to stable storage and will also be called if the dmu_tx is aborted. 807 * If there is any error which prevents the transaction from being committed to 808 * disk, the callback will be called with a value of error != 0. 809 * 810 * When multiple callbacks are registered to the transaction, the callbacks 811 * will be called in reverse order to let Lustre, the only user of commit 812 * callback currently, take the fast path of its commit callback handling. 813 */ 814 typedef void dmu_tx_callback_func_t(void *dcb_data, int error); 815 816 void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func, 817 void *dcb_data); 818 void dmu_tx_do_callbacks(list_t *cb_list, int error); 819 820 /* 821 * Free up the data blocks for a defined range of a file. If size is 822 * -1, the range from offset to end-of-file is freed. 823 */ 824 int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset, 825 uint64_t size, dmu_tx_t *tx); 826 int dmu_free_long_range(objset_t *os, uint64_t object, uint64_t offset, 827 uint64_t size); 828 int dmu_free_long_object(objset_t *os, uint64_t object); 829 830 /* 831 * Convenience functions. 832 * 833 * Canfail routines will return 0 on success, or an errno if there is a 834 * nonrecoverable I/O error. 835 */ 836 #define DMU_READ_PREFETCH 0 /* prefetch */ 837 #define DMU_READ_NO_PREFETCH 1 /* don't prefetch */ 838 #define DMU_READ_NO_DECRYPT 2 /* don't decrypt */ 839 int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 840 void *buf, uint32_t flags); 841 int dmu_read_by_dnode(dnode_t *dn, uint64_t offset, uint64_t size, void *buf, 842 uint32_t flags); 843 void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 844 const void *buf, dmu_tx_t *tx); 845 void dmu_write_by_dnode(dnode_t *dn, uint64_t offset, uint64_t size, 846 const void *buf, dmu_tx_t *tx); 847 void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, 848 dmu_tx_t *tx); 849 #ifdef _KERNEL 850 int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size); 851 int dmu_read_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size); 852 int dmu_read_uio_dnode(dnode_t *dn, struct uio *uio, uint64_t size); 853 int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size, 854 dmu_tx_t *tx); 855 int dmu_write_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size, 856 dmu_tx_t *tx); 857 int dmu_write_uio_dnode(dnode_t *dn, struct uio *uio, uint64_t size, 858 dmu_tx_t *tx); 859 #endif 860 struct arc_buf *dmu_request_arcbuf(dmu_buf_t *handle, int size); 861 void dmu_return_arcbuf(struct arc_buf *buf); 862 int dmu_assign_arcbuf_by_dnode(dnode_t *dn, uint64_t offset, 863 struct arc_buf *buf, dmu_tx_t *tx); 864 int dmu_assign_arcbuf_by_dbuf(dmu_buf_t *handle, uint64_t offset, 865 struct arc_buf *buf, dmu_tx_t *tx); 866 #define dmu_assign_arcbuf dmu_assign_arcbuf_by_dbuf 867 #ifdef HAVE_UIO_ZEROCOPY 868 int dmu_xuio_init(struct xuio *uio, int niov); 869 void dmu_xuio_fini(struct xuio *uio); 870 int dmu_xuio_add(struct xuio *uio, struct arc_buf *abuf, offset_t off, 871 size_t n); 872 int dmu_xuio_cnt(struct xuio *uio); 873 struct arc_buf *dmu_xuio_arcbuf(struct xuio *uio, int i); 874 void dmu_xuio_clear(struct xuio *uio, int i); 875 #endif /* HAVE_UIO_ZEROCOPY */ 876 void xuio_stat_wbuf_copied(void); 877 void xuio_stat_wbuf_nocopy(void); 878 879 extern int zfs_prefetch_disable; 880 extern int zfs_max_recordsize; 881 882 /* 883 * Asynchronously try to read in the data. 884 */ 885 void dmu_prefetch(objset_t *os, uint64_t object, int64_t level, uint64_t offset, 886 uint64_t len, enum zio_priority pri); 887 888 typedef struct dmu_object_info { 889 /* All sizes are in bytes unless otherwise indicated. */ 890 uint32_t doi_data_block_size; 891 uint32_t doi_metadata_block_size; 892 dmu_object_type_t doi_type; 893 dmu_object_type_t doi_bonus_type; 894 uint64_t doi_bonus_size; 895 uint8_t doi_indirection; /* 2 = dnode->indirect->data */ 896 uint8_t doi_checksum; 897 uint8_t doi_compress; 898 uint8_t doi_nblkptr; 899 uint8_t doi_pad[4]; 900 uint64_t doi_dnodesize; 901 uint64_t doi_physical_blocks_512; /* data + metadata, 512b blks */ 902 uint64_t doi_max_offset; 903 uint64_t doi_fill_count; /* number of non-empty blocks */ 904 } dmu_object_info_t; 905 906 typedef void (*const arc_byteswap_func_t)(void *buf, size_t size); 907 908 typedef struct dmu_object_type_info { 909 dmu_object_byteswap_t ot_byteswap; 910 boolean_t ot_metadata; 911 boolean_t ot_dbuf_metadata_cache; 912 boolean_t ot_encrypt; 913 char *ot_name; 914 } dmu_object_type_info_t; 915 916 typedef const struct dmu_object_byteswap_info { 917 arc_byteswap_func_t ob_func; 918 char *ob_name; 919 } dmu_object_byteswap_info_t; 920 921 extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES]; 922 extern const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS]; 923 924 /* 925 * Get information on a DMU object. 926 * 927 * Return 0 on success or ENOENT if object is not allocated. 928 * 929 * If doi is NULL, just indicates whether the object exists. 930 */ 931 int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi); 932 void __dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi); 933 /* Like dmu_object_info, but faster if you have a held dnode in hand. */ 934 void dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi); 935 /* Like dmu_object_info, but faster if you have a held dbuf in hand. */ 936 void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi); 937 /* 938 * Like dmu_object_info_from_db, but faster still when you only care about 939 * the size. 940 */ 941 void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize, 942 u_longlong_t *nblk512); 943 944 void dmu_object_dnsize_from_db(dmu_buf_t *db, int *dnsize); 945 946 typedef struct dmu_objset_stats { 947 uint64_t dds_num_clones; /* number of clones of this */ 948 uint64_t dds_creation_txg; 949 uint64_t dds_guid; 950 dmu_objset_type_t dds_type; 951 uint8_t dds_is_snapshot; 952 uint8_t dds_inconsistent; 953 uint8_t dds_redacted; 954 char dds_origin[ZFS_MAX_DATASET_NAME_LEN]; 955 } dmu_objset_stats_t; 956 957 /* 958 * Get stats on a dataset. 959 */ 960 void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat); 961 962 /* 963 * Add entries to the nvlist for all the objset's properties. See 964 * zfs_prop_table[] and zfs(1m) for details on the properties. 965 */ 966 void dmu_objset_stats(objset_t *os, struct nvlist *nv); 967 968 /* 969 * Get the space usage statistics for statvfs(). 970 * 971 * refdbytes is the amount of space "referenced" by this objset. 972 * availbytes is the amount of space available to this objset, taking 973 * into account quotas & reservations, assuming that no other objsets 974 * use the space first. These values correspond to the 'referenced' and 975 * 'available' properties, described in the zfs(1m) manpage. 976 * 977 * usedobjs and availobjs are the number of objects currently allocated, 978 * and available. 979 */ 980 void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 981 uint64_t *usedobjsp, uint64_t *availobjsp); 982 983 /* 984 * The fsid_guid is a 56-bit ID that can change to avoid collisions. 985 * (Contrast with the ds_guid which is a 64-bit ID that will never 986 * change, so there is a small probability that it will collide.) 987 */ 988 uint64_t dmu_objset_fsid_guid(objset_t *os); 989 990 /* 991 * Get the [cm]time for an objset's snapshot dir 992 */ 993 inode_timespec_t dmu_objset_snap_cmtime(objset_t *os); 994 995 int dmu_objset_is_snapshot(objset_t *os); 996 997 extern struct spa *dmu_objset_spa(objset_t *os); 998 extern struct zilog *dmu_objset_zil(objset_t *os); 999 extern struct dsl_pool *dmu_objset_pool(objset_t *os); 1000 extern struct dsl_dataset *dmu_objset_ds(objset_t *os); 1001 extern void dmu_objset_name(objset_t *os, char *buf); 1002 extern dmu_objset_type_t dmu_objset_type(objset_t *os); 1003 extern uint64_t dmu_objset_id(objset_t *os); 1004 extern uint64_t dmu_objset_dnodesize(objset_t *os); 1005 extern zfs_sync_type_t dmu_objset_syncprop(objset_t *os); 1006 extern zfs_logbias_op_t dmu_objset_logbias(objset_t *os); 1007 extern int dmu_objset_blksize(objset_t *os); 1008 extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 1009 uint64_t *id, uint64_t *offp, boolean_t *case_conflict); 1010 extern int dmu_snapshot_lookup(objset_t *os, const char *name, uint64_t *val); 1011 extern int dmu_snapshot_realname(objset_t *os, const char *name, char *real, 1012 int maxlen, boolean_t *conflict); 1013 extern int dmu_dir_list_next(objset_t *os, int namelen, char *name, 1014 uint64_t *idp, uint64_t *offp); 1015 1016 typedef struct zfs_file_info { 1017 uint64_t zfi_user; 1018 uint64_t zfi_group; 1019 uint64_t zfi_project; 1020 uint64_t zfi_generation; 1021 } zfs_file_info_t; 1022 1023 typedef int file_info_cb_t(dmu_object_type_t bonustype, const void *data, 1024 struct zfs_file_info *zoi); 1025 extern void dmu_objset_register_type(dmu_objset_type_t ost, 1026 file_info_cb_t *cb); 1027 extern void dmu_objset_set_user(objset_t *os, void *user_ptr); 1028 extern void *dmu_objset_get_user(objset_t *os); 1029 1030 /* 1031 * Return the txg number for the given assigned transaction. 1032 */ 1033 uint64_t dmu_tx_get_txg(dmu_tx_t *tx); 1034 1035 /* 1036 * Synchronous write. 1037 * If a parent zio is provided this function initiates a write on the 1038 * provided buffer as a child of the parent zio. 1039 * In the absence of a parent zio, the write is completed synchronously. 1040 * At write completion, blk is filled with the bp of the written block. 1041 * Note that while the data covered by this function will be on stable 1042 * storage when the write completes this new data does not become a 1043 * permanent part of the file until the associated transaction commits. 1044 */ 1045 1046 /* 1047 * {zfs,zvol,ztest}_get_done() args 1048 */ 1049 typedef struct zgd { 1050 struct lwb *zgd_lwb; 1051 struct blkptr *zgd_bp; 1052 dmu_buf_t *zgd_db; 1053 struct zfs_locked_range *zgd_lr; 1054 void *zgd_private; 1055 } zgd_t; 1056 1057 typedef void dmu_sync_cb_t(zgd_t *arg, int error); 1058 int dmu_sync(struct zio *zio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd); 1059 1060 /* 1061 * Find the next hole or data block in file starting at *off 1062 * Return found offset in *off. Return ESRCH for end of file. 1063 */ 1064 int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, 1065 uint64_t *off); 1066 1067 /* 1068 * Initial setup and final teardown. 1069 */ 1070 extern void dmu_init(void); 1071 extern void dmu_fini(void); 1072 1073 typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp, 1074 uint64_t object, uint64_t offset, int len); 1075 void dmu_traverse_objset(objset_t *os, uint64_t txg_start, 1076 dmu_traverse_cb_t cb, void *arg); 1077 1078 int dmu_diff(const char *tosnap_name, const char *fromsnap_name, 1079 zfs_file_t *fp, offset_t *offp); 1080 1081 /* CRC64 table */ 1082 #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */ 1083 extern uint64_t zfs_crc64_table[256]; 1084 1085 #ifdef __cplusplus 1086 } 1087 #endif 1088 1089 #endif /* _SYS_DMU_H */ 1090