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.
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.
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]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
25 /* Portions Copyright 2010 Robert Milkowski */
31 * This file describes the interface that the DMU provides for its
34 * The DMU also interacts with the SPA. That interface is described in
38 #include <sys/inttypes.h>
39 #include <sys/types.h>
40 #include <sys/param.h>
45 #include <sys/blkdev.h>
71 typedef struct objset objset_t
;
72 typedef struct dmu_tx dmu_tx_t
;
73 typedef struct dsl_dir dsl_dir_t
;
75 typedef enum dmu_object_type
{
78 DMU_OT_OBJECT_DIRECTORY
, /* ZAP */
79 DMU_OT_OBJECT_ARRAY
, /* UINT64 */
80 DMU_OT_PACKED_NVLIST
, /* UINT8 (XDR by nvlist_pack/unpack) */
81 DMU_OT_PACKED_NVLIST_SIZE
, /* UINT64 */
82 DMU_OT_BPOBJ
, /* UINT64 */
83 DMU_OT_BPOBJ_HDR
, /* UINT64 */
85 DMU_OT_SPACE_MAP_HEADER
, /* UINT64 */
86 DMU_OT_SPACE_MAP
, /* UINT64 */
88 DMU_OT_INTENT_LOG
, /* UINT64 */
90 DMU_OT_DNODE
, /* DNODE */
91 DMU_OT_OBJSET
, /* OBJSET */
93 DMU_OT_DSL_DIR
, /* UINT64 */
94 DMU_OT_DSL_DIR_CHILD_MAP
, /* ZAP */
95 DMU_OT_DSL_DS_SNAP_MAP
, /* ZAP */
96 DMU_OT_DSL_PROPS
, /* ZAP */
97 DMU_OT_DSL_DATASET
, /* UINT64 */
99 DMU_OT_ZNODE
, /* ZNODE */
100 DMU_OT_OLDACL
, /* Old ACL */
101 DMU_OT_PLAIN_FILE_CONTENTS
, /* UINT8 */
102 DMU_OT_DIRECTORY_CONTENTS
, /* ZAP */
103 DMU_OT_MASTER_NODE
, /* ZAP */
104 DMU_OT_UNLINKED_SET
, /* ZAP */
106 DMU_OT_ZVOL
, /* UINT8 */
107 DMU_OT_ZVOL_PROP
, /* ZAP */
108 /* other; for testing only! */
109 DMU_OT_PLAIN_OTHER
, /* UINT8 */
110 DMU_OT_UINT64_OTHER
, /* UINT64 */
111 DMU_OT_ZAP_OTHER
, /* ZAP */
112 /* new object types: */
113 DMU_OT_ERROR_LOG
, /* ZAP */
114 DMU_OT_SPA_HISTORY
, /* UINT8 */
115 DMU_OT_SPA_HISTORY_OFFSETS
, /* spa_his_phys_t */
116 DMU_OT_POOL_PROPS
, /* ZAP */
117 DMU_OT_DSL_PERMS
, /* ZAP */
118 DMU_OT_ACL
, /* ACL */
119 DMU_OT_SYSACL
, /* SYSACL */
120 DMU_OT_FUID
, /* FUID table (Packed NVLIST UINT8) */
121 DMU_OT_FUID_SIZE
, /* FUID table size UINT64 */
122 DMU_OT_NEXT_CLONES
, /* ZAP */
123 DMU_OT_SCAN_QUEUE
, /* ZAP */
124 DMU_OT_USERGROUP_USED
, /* ZAP */
125 DMU_OT_USERGROUP_QUOTA
, /* ZAP */
126 DMU_OT_USERREFS
, /* ZAP */
127 DMU_OT_DDT_ZAP
, /* ZAP */
128 DMU_OT_DDT_STATS
, /* ZAP */
129 DMU_OT_SA
, /* System attr */
130 DMU_OT_SA_MASTER_NODE
, /* ZAP */
131 DMU_OT_SA_ATTR_REGISTRATION
, /* ZAP */
132 DMU_OT_SA_ATTR_LAYOUTS
, /* ZAP */
133 DMU_OT_SCAN_XLATE
, /* ZAP */
134 DMU_OT_DEDUP
, /* fake dedup BP from ddt_bp_create() */
135 DMU_OT_DEADLIST
, /* ZAP */
136 DMU_OT_DEADLIST_HDR
, /* UINT64 */
137 DMU_OT_DSL_CLONES
, /* ZAP */
138 DMU_OT_BPOBJ_SUBOBJ
, /* UINT64 */
142 typedef enum dmu_objset_type
{
147 DMU_OST_OTHER
, /* For testing only! */
148 DMU_OST_ANY
, /* Be careful! */
152 void byteswap_uint64_array(void *buf
, size_t size
);
153 void byteswap_uint32_array(void *buf
, size_t size
);
154 void byteswap_uint16_array(void *buf
, size_t size
);
155 void byteswap_uint8_array(void *buf
, size_t size
);
156 void zap_byteswap(void *buf
, size_t size
);
157 void zfs_oldacl_byteswap(void *buf
, size_t size
);
158 void zfs_acl_byteswap(void *buf
, size_t size
);
159 void zfs_znode_byteswap(void *buf
, size_t size
);
161 #define DS_FIND_SNAPSHOTS (1<<0)
162 #define DS_FIND_CHILDREN (1<<1)
165 * The maximum number of bytes that can be accessed as part of one
166 * operation, including metadata.
168 #define DMU_MAX_ACCESS (10<<20) /* 10MB */
169 #define DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */
171 #define DMU_USERUSED_OBJECT (-1ULL)
172 #define DMU_GROUPUSED_OBJECT (-2ULL)
173 #define DMU_DEADLIST_OBJECT (-3ULL)
176 * artificial blkids for bonus buffer and spill blocks
178 #define DMU_BONUS_BLKID (-1ULL)
179 #define DMU_SPILL_BLKID (-2ULL)
181 * Public routines to create, destroy, open, and close objsets.
183 int dmu_objset_hold(const char *name
, void *tag
, objset_t
**osp
);
184 int dmu_objset_own(const char *name
, dmu_objset_type_t type
,
185 boolean_t readonly
, void *tag
, objset_t
**osp
);
186 void dmu_objset_rele(objset_t
*os
, void *tag
);
187 void dmu_objset_disown(objset_t
*os
, void *tag
);
188 int dmu_objset_open_ds(struct dsl_dataset
*ds
, objset_t
**osp
);
190 int dmu_objset_evict_dbufs(objset_t
*os
);
191 int dmu_objset_create(const char *name
, dmu_objset_type_t type
, uint64_t flags
,
192 void (*func
)(objset_t
*os
, void *arg
, cred_t
*cr
, dmu_tx_t
*tx
), void *arg
);
193 int dmu_objset_clone(const char *name
, struct dsl_dataset
*clone_origin
,
195 int dmu_objset_destroy(const char *name
, boolean_t defer
);
196 int dmu_snapshots_destroy(char *fsname
, char *snapname
, boolean_t defer
);
197 int dmu_objset_snapshot(char *fsname
, char *snapname
, char *tag
,
198 struct nvlist
*props
, boolean_t recursive
, boolean_t temporary
, int fd
);
199 int dmu_objset_rename(const char *name
, const char *newname
,
200 boolean_t recursive
);
201 int dmu_objset_find(char *name
, int func(const char *, void *), void *arg
,
203 void dmu_objset_byteswap(void *buf
, size_t size
);
205 typedef struct dmu_buf
{
206 uint64_t db_object
; /* object that this buffer is part of */
207 uint64_t db_offset
; /* byte offset in this object */
208 uint64_t db_size
; /* size of buffer in bytes */
209 void *db_data
; /* data in buffer */
212 typedef void dmu_buf_evict_func_t(struct dmu_buf
*db
, void *user_ptr
);
215 * The names of zap entries in the DIRECTORY_OBJECT of the MOS.
217 #define DMU_POOL_DIRECTORY_OBJECT 1
218 #define DMU_POOL_CONFIG "config"
219 #define DMU_POOL_ROOT_DATASET "root_dataset"
220 #define DMU_POOL_SYNC_BPOBJ "sync_bplist"
221 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub"
222 #define DMU_POOL_ERRLOG_LAST "errlog_last"
223 #define DMU_POOL_SPARES "spares"
224 #define DMU_POOL_DEFLATE "deflate"
225 #define DMU_POOL_HISTORY "history"
226 #define DMU_POOL_PROPS "pool_props"
227 #define DMU_POOL_L2CACHE "l2cache"
228 #define DMU_POOL_TMP_USERREFS "tmp_userrefs"
229 #define DMU_POOL_DDT "DDT-%s-%s-%s"
230 #define DMU_POOL_DDT_STATS "DDT-statistics"
231 #define DMU_POOL_CREATION_VERSION "creation_version"
232 #define DMU_POOL_SCAN "scan"
233 #define DMU_POOL_FREE_BPOBJ "free_bpobj"
236 * Allocate an object from this objset. The range of object numbers
237 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode.
239 * The transaction must be assigned to a txg. The newly allocated
240 * object will be "held" in the transaction (ie. you can modify the
241 * newly allocated object in this transaction).
243 * dmu_object_alloc() chooses an object and returns it in *objectp.
245 * dmu_object_claim() allocates a specific object number. If that
246 * number is already allocated, it fails and returns EEXIST.
248 * Return 0 on success, or ENOSPC or EEXIST as specified above.
250 uint64_t dmu_object_alloc(objset_t
*os
, dmu_object_type_t ot
,
251 int blocksize
, dmu_object_type_t bonus_type
, int bonus_len
, dmu_tx_t
*tx
);
252 int dmu_object_claim(objset_t
*os
, uint64_t object
, dmu_object_type_t ot
,
253 int blocksize
, dmu_object_type_t bonus_type
, int bonus_len
, dmu_tx_t
*tx
);
254 int dmu_object_reclaim(objset_t
*os
, uint64_t object
, dmu_object_type_t ot
,
255 int blocksize
, dmu_object_type_t bonustype
, int bonuslen
);
258 * Free an object from this objset.
260 * The object's data will be freed as well (ie. you don't need to call
261 * dmu_free(object, 0, -1, tx)).
263 * The object need not be held in the transaction.
265 * If there are any holds on this object's buffers (via dmu_buf_hold()),
266 * or tx holds on the object (via dmu_tx_hold_object()), you can not
267 * free it; it fails and returns EBUSY.
269 * If the object is not allocated, it fails and returns ENOENT.
271 * Return 0 on success, or EBUSY or ENOENT as specified above.
273 int dmu_object_free(objset_t
*os
, uint64_t object
, dmu_tx_t
*tx
);
276 * Find the next allocated or free object.
278 * The objectp parameter is in-out. It will be updated to be the next
279 * object which is allocated. Ignore objects which have not been
280 * modified since txg.
282 * XXX Can only be called on a objset with no dirty data.
284 * Returns 0 on success, or ENOENT if there are no more objects.
286 int dmu_object_next(objset_t
*os
, uint64_t *objectp
,
287 boolean_t hole
, uint64_t txg
);
290 * Set the data blocksize for an object.
292 * The object cannot have any blocks allcated beyond the first. If
293 * the first block is allocated already, the new size must be greater
294 * than the current block size. If these conditions are not met,
295 * ENOTSUP will be returned.
297 * Returns 0 on success, or EBUSY if there are any holds on the object
298 * contents, or ENOTSUP as described above.
300 int dmu_object_set_blocksize(objset_t
*os
, uint64_t object
, uint64_t size
,
301 int ibs
, dmu_tx_t
*tx
);
304 * Set the checksum property on a dnode. The new checksum algorithm will
305 * apply to all newly written blocks; existing blocks will not be affected.
307 void dmu_object_set_checksum(objset_t
*os
, uint64_t object
, uint8_t checksum
,
311 * Set the compress property on a dnode. The new compression algorithm will
312 * apply to all newly written blocks; existing blocks will not be affected.
314 void dmu_object_set_compress(objset_t
*os
, uint64_t object
, uint8_t compress
,
318 * Decide how to write a block: checksum, compression, number of copies, etc.
320 #define WP_NOFILL 0x1
321 #define WP_DMU_SYNC 0x2
324 void dmu_write_policy(objset_t
*os
, struct dnode
*dn
, int level
, int wp
,
325 struct zio_prop
*zp
);
327 * The bonus data is accessed more or less like a regular buffer.
328 * You must dmu_bonus_hold() to get the buffer, which will give you a
329 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus
330 * data. As with any normal buffer, you must call dmu_buf_read() to
331 * read db_data, dmu_buf_will_dirty() before modifying it, and the
332 * object must be held in an assigned transaction before calling
333 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus
334 * buffer as well. You must release your hold with dmu_buf_rele().
336 int dmu_bonus_hold(objset_t
*os
, uint64_t object
, void *tag
, dmu_buf_t
**);
337 int dmu_bonus_max(void);
338 int dmu_set_bonus(dmu_buf_t
*, int, dmu_tx_t
*);
339 int dmu_set_bonustype(dmu_buf_t
*, dmu_object_type_t
, dmu_tx_t
*);
340 dmu_object_type_t
dmu_get_bonustype(dmu_buf_t
*);
341 int dmu_rm_spill(objset_t
*, uint64_t, dmu_tx_t
*);
344 * Special spill buffer support used by "SA" framework
347 int dmu_spill_hold_by_bonus(dmu_buf_t
*bonus
, void *tag
, dmu_buf_t
**dbp
);
348 int dmu_spill_hold_by_dnode(struct dnode
*dn
, uint32_t flags
,
349 void *tag
, dmu_buf_t
**dbp
);
350 int dmu_spill_hold_existing(dmu_buf_t
*bonus
, void *tag
, dmu_buf_t
**dbp
);
353 * Obtain the DMU buffer from the specified object which contains the
354 * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so
355 * that it will remain in memory. You must release the hold with
356 * dmu_buf_rele(). You musn't access the dmu_buf_t after releasing your
357 * hold. You must have a hold on any dmu_buf_t* you pass to the DMU.
359 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill
360 * on the returned buffer before reading or writing the buffer's
361 * db_data. The comments for those routines describe what particular
362 * operations are valid after calling them.
364 * The object number must be a valid, allocated object number.
366 int dmu_buf_hold(objset_t
*os
, uint64_t object
, uint64_t offset
,
367 void *tag
, dmu_buf_t
**, int flags
);
368 void dmu_buf_add_ref(dmu_buf_t
*db
, void* tag
);
369 void dmu_buf_rele(dmu_buf_t
*db
, void *tag
);
370 uint64_t dmu_buf_refcount(dmu_buf_t
*db
);
373 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a
374 * range of an object. A pointer to an array of dmu_buf_t*'s is
375 * returned (in *dbpp).
377 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and
378 * frees the array. The hold on the array of buffers MUST be released
379 * with dmu_buf_rele_array. You can NOT release the hold on each buffer
380 * individually with dmu_buf_rele.
382 int dmu_buf_hold_array_by_bonus(dmu_buf_t
*db
, uint64_t offset
,
383 uint64_t length
, int read
, void *tag
, int *numbufsp
, dmu_buf_t
***dbpp
);
384 void dmu_buf_rele_array(dmu_buf_t
**, int numbufs
, void *tag
);
387 * Returns NULL on success, or the existing user ptr if it's already
390 * user_ptr is for use by the user and can be obtained via dmu_buf_get_user().
392 * user_data_ptr_ptr should be NULL, or a pointer to a pointer which
393 * will be set to db->db_data when you are allowed to access it. Note
394 * that db->db_data (the pointer) can change when you do dmu_buf_read(),
395 * dmu_buf_tryupgrade(), dmu_buf_will_dirty(), or dmu_buf_will_fill().
396 * *user_data_ptr_ptr will be set to the new value when it changes.
398 * If non-NULL, pageout func will be called when this buffer is being
399 * excised from the cache, so that you can clean up the data structure
400 * pointed to by user_ptr.
402 * dmu_evict_user() will call the pageout func for all buffers in a
403 * objset with a given pageout func.
405 void *dmu_buf_set_user(dmu_buf_t
*db
, void *user_ptr
, void *user_data_ptr_ptr
,
406 dmu_buf_evict_func_t
*pageout_func
);
408 * set_user_ie is the same as set_user, but request immediate eviction
409 * when hold count goes to zero.
411 void *dmu_buf_set_user_ie(dmu_buf_t
*db
, void *user_ptr
,
412 void *user_data_ptr_ptr
, dmu_buf_evict_func_t
*pageout_func
);
413 void *dmu_buf_update_user(dmu_buf_t
*db_fake
, void *old_user_ptr
,
414 void *user_ptr
, void *user_data_ptr_ptr
,
415 dmu_buf_evict_func_t
*pageout_func
);
416 void dmu_evict_user(objset_t
*os
, dmu_buf_evict_func_t
*func
);
419 * Returns the user_ptr set with dmu_buf_set_user(), or NULL if not set.
421 void *dmu_buf_get_user(dmu_buf_t
*db
);
424 * Indicate that you are going to modify the buffer's data (db_data).
426 * The transaction (tx) must be assigned to a txg (ie. you've called
427 * dmu_tx_assign()). The buffer's object must be held in the tx
428 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)).
430 void dmu_buf_will_dirty(dmu_buf_t
*db
, dmu_tx_t
*tx
);
433 * Tells if the given dbuf is freeable.
435 boolean_t
dmu_buf_freeable(dmu_buf_t
*);
438 * You must create a transaction, then hold the objects which you will
439 * (or might) modify as part of this transaction. Then you must assign
440 * the transaction to a transaction group. Once the transaction has
441 * been assigned, you can modify buffers which belong to held objects as
442 * part of this transaction. You can't modify buffers before the
443 * transaction has been assigned; you can't modify buffers which don't
444 * belong to objects which this transaction holds; you can't hold
445 * objects once the transaction has been assigned. You may hold an
446 * object which you are going to free (with dmu_object_free()), but you
449 * You can abort the transaction before it has been assigned.
451 * Note that you may hold buffers (with dmu_buf_hold) at any time,
452 * regardless of transaction state.
455 #define DMU_NEW_OBJECT (-1ULL)
456 #define DMU_OBJECT_END (-1ULL)
458 dmu_tx_t
*dmu_tx_create(objset_t
*os
);
459 void dmu_tx_hold_write(dmu_tx_t
*tx
, uint64_t object
, uint64_t off
, int len
);
460 void dmu_tx_hold_free(dmu_tx_t
*tx
, uint64_t object
, uint64_t off
,
462 void dmu_tx_hold_zap(dmu_tx_t
*tx
, uint64_t object
, int add
, const char *name
);
463 void dmu_tx_hold_bonus(dmu_tx_t
*tx
, uint64_t object
);
464 void dmu_tx_hold_spill(dmu_tx_t
*tx
, uint64_t object
);
465 void dmu_tx_hold_sa(dmu_tx_t
*tx
, struct sa_handle
*hdl
, boolean_t may_grow
);
466 void dmu_tx_hold_sa_create(dmu_tx_t
*tx
, int total_size
);
467 void dmu_tx_abort(dmu_tx_t
*tx
);
468 int dmu_tx_assign(dmu_tx_t
*tx
, uint64_t txg_how
);
469 void dmu_tx_wait(dmu_tx_t
*tx
);
470 void dmu_tx_commit(dmu_tx_t
*tx
);
473 * To register a commit callback, dmu_tx_callback_register() must be called.
475 * dcb_data is a pointer to caller private data that is passed on as a
476 * callback parameter. The caller is responsible for properly allocating and
479 * When registering a callback, the transaction must be already created, but
480 * it cannot be committed or aborted. It can be assigned to a txg or not.
482 * The callback will be called after the transaction has been safely written
483 * to stable storage and will also be called if the dmu_tx is aborted.
484 * If there is any error which prevents the transaction from being committed to
485 * disk, the callback will be called with a value of error != 0.
487 typedef void dmu_tx_callback_func_t(void *dcb_data
, int error
);
489 void dmu_tx_callback_register(dmu_tx_t
*tx
, dmu_tx_callback_func_t
*dcb_func
,
493 * Free up the data blocks for a defined range of a file. If size is
494 * zero, the range from offset to end-of-file is freed.
496 int dmu_free_range(objset_t
*os
, uint64_t object
, uint64_t offset
,
497 uint64_t size
, dmu_tx_t
*tx
);
498 int dmu_free_long_range(objset_t
*os
, uint64_t object
, uint64_t offset
,
500 int dmu_free_object(objset_t
*os
, uint64_t object
);
503 * Convenience functions.
505 * Canfail routines will return 0 on success, or an errno if there is a
506 * nonrecoverable I/O error.
508 #define DMU_READ_PREFETCH 0 /* prefetch */
509 #define DMU_READ_NO_PREFETCH 1 /* don't prefetch */
510 int dmu_read(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
511 void *buf
, uint32_t flags
);
512 void dmu_write(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
513 const void *buf
, dmu_tx_t
*tx
);
514 void dmu_prealloc(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
517 int dmu_read_req(objset_t
*os
, uint64_t object
, struct request
*req
);
518 int dmu_write_req(objset_t
*os
, uint64_t object
, struct request
*req
, dmu_tx_t
*tx
);
521 int dmu_write_pages(objset_t
*os
, uint64_t object
, uint64_t offset
,
522 uint64_t size
, struct page
*pp
, dmu_tx_t
*tx
);
524 struct arc_buf
*dmu_request_arcbuf(dmu_buf_t
*handle
, int size
);
525 void dmu_return_arcbuf(struct arc_buf
*buf
);
526 void dmu_assign_arcbuf(dmu_buf_t
*handle
, uint64_t offset
, struct arc_buf
*buf
,
528 int dmu_xuio_init(struct xuio
*uio
, int niov
);
529 void dmu_xuio_fini(struct xuio
*uio
);
530 int dmu_xuio_add(struct xuio
*uio
, struct arc_buf
*abuf
, offset_t off
,
532 int dmu_xuio_cnt(struct xuio
*uio
);
533 struct arc_buf
*dmu_xuio_arcbuf(struct xuio
*uio
, int i
);
534 void dmu_xuio_clear(struct xuio
*uio
, int i
);
535 void xuio_stat_wbuf_copied(void);
536 void xuio_stat_wbuf_nocopy(void);
538 extern int zfs_prefetch_disable
;
541 * Asynchronously try to read in the data.
543 void dmu_prefetch(objset_t
*os
, uint64_t object
, uint64_t offset
,
546 typedef struct dmu_object_info
{
547 /* All sizes are in bytes unless otherwise indicated. */
548 uint32_t doi_data_block_size
;
549 uint32_t doi_metadata_block_size
;
550 dmu_object_type_t doi_type
;
551 dmu_object_type_t doi_bonus_type
;
552 uint64_t doi_bonus_size
;
553 uint8_t doi_indirection
; /* 2 = dnode->indirect->data */
554 uint8_t doi_checksum
;
555 uint8_t doi_compress
;
557 uint64_t doi_physical_blocks_512
; /* data + metadata, 512b blks */
558 uint64_t doi_max_offset
;
559 uint64_t doi_fill_count
; /* number of non-empty blocks */
562 typedef void arc_byteswap_func_t(void *buf
, size_t size
);
564 typedef struct dmu_object_type_info
{
565 arc_byteswap_func_t
*ot_byteswap
;
566 boolean_t ot_metadata
;
568 } dmu_object_type_info_t
;
570 extern const dmu_object_type_info_t dmu_ot
[DMU_OT_NUMTYPES
];
573 * Get information on a DMU object.
575 * Return 0 on success or ENOENT if object is not allocated.
577 * If doi is NULL, just indicates whether the object exists.
579 int dmu_object_info(objset_t
*os
, uint64_t object
, dmu_object_info_t
*doi
);
580 void dmu_object_info_from_dnode(struct dnode
*dn
, dmu_object_info_t
*doi
);
581 void dmu_object_info_from_db(dmu_buf_t
*db
, dmu_object_info_t
*doi
);
582 void dmu_object_size_from_db(dmu_buf_t
*db
, uint32_t *blksize
,
583 u_longlong_t
*nblk512
);
585 typedef struct dmu_objset_stats
{
586 uint64_t dds_num_clones
; /* number of clones of this */
587 uint64_t dds_creation_txg
;
589 dmu_objset_type_t dds_type
;
590 uint8_t dds_is_snapshot
;
591 uint8_t dds_inconsistent
;
592 char dds_origin
[MAXNAMELEN
];
593 } dmu_objset_stats_t
;
596 * Get stats on a dataset.
598 void dmu_objset_fast_stat(objset_t
*os
, dmu_objset_stats_t
*stat
);
601 * Add entries to the nvlist for all the objset's properties. See
602 * zfs_prop_table[] and zfs(1m) for details on the properties.
604 void dmu_objset_stats(objset_t
*os
, struct nvlist
*nv
);
607 * Get the space usage statistics for statvfs().
609 * refdbytes is the amount of space "referenced" by this objset.
610 * availbytes is the amount of space available to this objset, taking
611 * into account quotas & reservations, assuming that no other objsets
612 * use the space first. These values correspond to the 'referenced' and
613 * 'available' properties, described in the zfs(1m) manpage.
615 * usedobjs and availobjs are the number of objects currently allocated,
618 void dmu_objset_space(objset_t
*os
, uint64_t *refdbytesp
, uint64_t *availbytesp
,
619 uint64_t *usedobjsp
, uint64_t *availobjsp
);
622 * The fsid_guid is a 56-bit ID that can change to avoid collisions.
623 * (Contrast with the ds_guid which is a 64-bit ID that will never
624 * change, so there is a small probability that it will collide.)
626 uint64_t dmu_objset_fsid_guid(objset_t
*os
);
629 * Get the [cm]time for an objset's snapshot dir
631 timestruc_t
dmu_objset_snap_cmtime(objset_t
*os
);
633 int dmu_objset_is_snapshot(objset_t
*os
);
635 extern struct spa
*dmu_objset_spa(objset_t
*os
);
636 extern struct zilog
*dmu_objset_zil(objset_t
*os
);
637 extern struct dsl_pool
*dmu_objset_pool(objset_t
*os
);
638 extern struct dsl_dataset
*dmu_objset_ds(objset_t
*os
);
639 extern void dmu_objset_name(objset_t
*os
, char *buf
);
640 extern dmu_objset_type_t
dmu_objset_type(objset_t
*os
);
641 extern uint64_t dmu_objset_id(objset_t
*os
);
642 extern uint64_t dmu_objset_syncprop(objset_t
*os
);
643 extern uint64_t dmu_objset_logbias(objset_t
*os
);
644 extern int dmu_snapshot_list_next(objset_t
*os
, int namelen
, char *name
,
645 uint64_t *id
, uint64_t *offp
, boolean_t
*case_conflict
);
646 extern int dmu_snapshot_realname(objset_t
*os
, char *name
, char *real
,
647 int maxlen
, boolean_t
*conflict
);
648 extern int dmu_dir_list_next(objset_t
*os
, int namelen
, char *name
,
649 uint64_t *idp
, uint64_t *offp
);
651 typedef int objset_used_cb_t(dmu_object_type_t bonustype
,
652 void *bonus
, uint64_t *userp
, uint64_t *groupp
);
653 extern void dmu_objset_register_type(dmu_objset_type_t ost
,
654 objset_used_cb_t
*cb
);
655 extern void dmu_objset_set_user(objset_t
*os
, void *user_ptr
);
656 extern void *dmu_objset_get_user(objset_t
*os
);
659 * Return the txg number for the given assigned transaction.
661 uint64_t dmu_tx_get_txg(dmu_tx_t
*tx
);
665 * If a parent zio is provided this function initiates a write on the
666 * provided buffer as a child of the parent zio.
667 * In the absence of a parent zio, the write is completed synchronously.
668 * At write completion, blk is filled with the bp of the written block.
669 * Note that while the data covered by this function will be on stable
670 * storage when the write completes this new data does not become a
671 * permanent part of the file until the associated transaction commits.
675 * {zfs,zvol,ztest}_get_done() args
678 struct zilog
*zgd_zilog
;
679 struct blkptr
*zgd_bp
;
685 typedef void dmu_sync_cb_t(zgd_t
*arg
, int error
);
686 int dmu_sync(struct zio
*zio
, uint64_t txg
, dmu_sync_cb_t
*done
, zgd_t
*zgd
);
689 * Find the next hole or data block in file starting at *off
690 * Return found offset in *off. Return ESRCH for end of file.
692 int dmu_offset_next(objset_t
*os
, uint64_t object
, boolean_t hole
,
696 * Initial setup and final teardown.
698 extern void dmu_init(void);
699 extern void dmu_fini(void);
701 typedef void (*dmu_traverse_cb_t
)(objset_t
*os
, void *arg
, struct blkptr
*bp
,
702 uint64_t object
, uint64_t offset
, int len
);
703 void dmu_traverse_objset(objset_t
*os
, uint64_t txg_start
,
704 dmu_traverse_cb_t cb
, void *arg
);
706 int dmu_sendbackup(objset_t
*tosnap
, objset_t
*fromsnap
, boolean_t fromorigin
,
707 struct vnode
*vp
, offset_t
*off
);
709 typedef struct dmu_recv_cookie
{
711 * This structure is opaque!
713 * If logical and real are different, we are recving the stream
714 * into the "real" temporary clone, and then switching it with
715 * the "logical" target.
717 struct dsl_dataset
*drc_logical_ds
;
718 struct dsl_dataset
*drc_real_ds
;
719 struct drr_begin
*drc_drrb
;
726 int dmu_recv_begin(char *tofs
, char *tosnap
, char *topds
, struct drr_begin
*,
727 boolean_t force
, objset_t
*origin
, dmu_recv_cookie_t
*);
728 int dmu_recv_stream(dmu_recv_cookie_t
*drc
, struct vnode
*vp
, offset_t
*voffp
,
729 int cleanup_fd
, uint64_t *action_handlep
);
730 int dmu_recv_end(dmu_recv_cookie_t
*drc
);
732 int dmu_diff(objset_t
*tosnap
, objset_t
*fromsnap
, struct vnode
*vp
,
736 #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */
737 extern uint64_t zfs_crc64_table
[256];
743 #endif /* _SYS_DMU_H */