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 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
30 * This file describes the interface that the DMU provides for its
33 * The DMU also interacts with the SPA. That interface is described in
37 #include <sys/inttypes.h>
38 #include <sys/types.h>
39 #include <sys/param.h>
64 typedef struct objset objset_t
;
65 typedef struct dmu_tx dmu_tx_t
;
66 typedef struct dsl_dir dsl_dir_t
;
68 typedef enum dmu_object_type
{
71 DMU_OT_OBJECT_DIRECTORY
, /* ZAP */
72 DMU_OT_OBJECT_ARRAY
, /* UINT64 */
73 DMU_OT_PACKED_NVLIST
, /* UINT8 (XDR by nvlist_pack/unpack) */
74 DMU_OT_PACKED_NVLIST_SIZE
, /* UINT64 */
75 DMU_OT_BPLIST
, /* UINT64 */
76 DMU_OT_BPLIST_HDR
, /* UINT64 */
78 DMU_OT_SPACE_MAP_HEADER
, /* UINT64 */
79 DMU_OT_SPACE_MAP
, /* UINT64 */
81 DMU_OT_INTENT_LOG
, /* UINT64 */
83 DMU_OT_DNODE
, /* DNODE */
84 DMU_OT_OBJSET
, /* OBJSET */
86 DMU_OT_DSL_DIR
, /* UINT64 */
87 DMU_OT_DSL_DIR_CHILD_MAP
, /* ZAP */
88 DMU_OT_DSL_DS_SNAP_MAP
, /* ZAP */
89 DMU_OT_DSL_PROPS
, /* ZAP */
90 DMU_OT_DSL_DATASET
, /* UINT64 */
92 DMU_OT_ZNODE
, /* ZNODE */
93 DMU_OT_OLDACL
, /* Old ACL */
94 DMU_OT_PLAIN_FILE_CONTENTS
, /* UINT8 */
95 DMU_OT_DIRECTORY_CONTENTS
, /* ZAP */
96 DMU_OT_MASTER_NODE
, /* ZAP */
97 DMU_OT_UNLINKED_SET
, /* ZAP */
99 DMU_OT_ZVOL
, /* UINT8 */
100 DMU_OT_ZVOL_PROP
, /* ZAP */
101 /* other; for testing only! */
102 DMU_OT_PLAIN_OTHER
, /* UINT8 */
103 DMU_OT_UINT64_OTHER
, /* UINT64 */
104 DMU_OT_ZAP_OTHER
, /* ZAP */
105 /* new object types: */
106 DMU_OT_ERROR_LOG
, /* ZAP */
107 DMU_OT_SPA_HISTORY
, /* UINT8 */
108 DMU_OT_SPA_HISTORY_OFFSETS
, /* spa_his_phys_t */
109 DMU_OT_POOL_PROPS
, /* ZAP */
110 DMU_OT_DSL_PERMS
, /* ZAP */
111 DMU_OT_ACL
, /* ACL */
112 DMU_OT_SYSACL
, /* SYSACL */
113 DMU_OT_FUID
, /* FUID table (Packed NVLIST UINT8) */
114 DMU_OT_FUID_SIZE
, /* FUID table size UINT64 */
115 DMU_OT_NEXT_CLONES
, /* ZAP */
116 DMU_OT_SCRUB_QUEUE
, /* ZAP */
120 typedef enum dmu_objset_type
{
125 DMU_OST_OTHER
, /* For testing only! */
126 DMU_OST_ANY
, /* Be careful! */
130 void byteswap_uint64_array(void *buf
, size_t size
);
131 void byteswap_uint32_array(void *buf
, size_t size
);
132 void byteswap_uint16_array(void *buf
, size_t size
);
133 void byteswap_uint8_array(void *buf
, size_t size
);
134 void zap_byteswap(void *buf
, size_t size
);
135 void zfs_oldacl_byteswap(void *buf
, size_t size
);
136 void zfs_acl_byteswap(void *buf
, size_t size
);
137 void zfs_znode_byteswap(void *buf
, size_t size
);
139 #define DS_MODE_NOHOLD 0 /* internal use only */
140 #define DS_MODE_USER 1 /* simple access, no special needs */
141 #define DS_MODE_OWNER 2 /* the "main" access, e.g. a mount */
142 #define DS_MODE_TYPE_MASK 0x3
143 #define DS_MODE_TYPE(x) ((x) & DS_MODE_TYPE_MASK)
144 #define DS_MODE_READONLY 0x8
145 #define DS_MODE_IS_READONLY(x) ((x) & DS_MODE_READONLY)
146 #define DS_MODE_INCONSISTENT 0x10
147 #define DS_MODE_IS_INCONSISTENT(x) ((x) & DS_MODE_INCONSISTENT)
149 #define DS_FIND_SNAPSHOTS (1<<0)
150 #define DS_FIND_CHILDREN (1<<1)
153 * The maximum number of bytes that can be accessed as part of one
154 * operation, including metadata.
156 #define DMU_MAX_ACCESS (10<<20) /* 10MB */
157 #define DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */
160 * Public routines to create, destroy, open, and close objsets.
162 int dmu_objset_open(const char *name
, dmu_objset_type_t type
, int mode
,
164 int dmu_objset_open_ds(struct dsl_dataset
*ds
, dmu_objset_type_t type
,
166 void dmu_objset_close(objset_t
*os
);
167 int dmu_objset_evict_dbufs(objset_t
*os
);
168 int dmu_objset_create(const char *name
, dmu_objset_type_t type
,
169 objset_t
*clone_parent
, uint64_t flags
,
170 void (*func
)(objset_t
*os
, void *arg
, cred_t
*cr
, dmu_tx_t
*tx
), void *arg
);
171 int dmu_objset_destroy(const char *name
);
172 int dmu_snapshots_destroy(char *fsname
, char *snapname
);
173 int dmu_objset_rollback(objset_t
*os
);
174 int dmu_objset_snapshot(char *fsname
, char *snapname
, boolean_t recursive
);
175 int dmu_objset_rename(const char *name
, const char *newname
,
176 boolean_t recursive
);
177 int dmu_objset_find(char *name
, int func(char *, void *), void *arg
,
179 void dmu_objset_byteswap(void *buf
, size_t size
);
181 typedef struct dmu_buf
{
182 uint64_t db_object
; /* object that this buffer is part of */
183 uint64_t db_offset
; /* byte offset in this object */
184 uint64_t db_size
; /* size of buffer in bytes */
185 void *db_data
; /* data in buffer */
188 typedef void dmu_buf_evict_func_t(struct dmu_buf
*db
, void *user_ptr
);
191 * The names of zap entries in the DIRECTORY_OBJECT of the MOS.
193 #define DMU_POOL_DIRECTORY_OBJECT 1
194 #define DMU_POOL_CONFIG "config"
195 #define DMU_POOL_ROOT_DATASET "root_dataset"
196 #define DMU_POOL_SYNC_BPLIST "sync_bplist"
197 #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub"
198 #define DMU_POOL_ERRLOG_LAST "errlog_last"
199 #define DMU_POOL_SPARES "spares"
200 #define DMU_POOL_DEFLATE "deflate"
201 #define DMU_POOL_HISTORY "history"
202 #define DMU_POOL_PROPS "pool_props"
203 #define DMU_POOL_L2CACHE "l2cache"
205 /* 4x8 zbookmark_t */
206 #define DMU_POOL_SCRUB_BOOKMARK "scrub_bookmark"
207 /* 1x8 zap obj DMU_OT_SCRUB_QUEUE */
208 #define DMU_POOL_SCRUB_QUEUE "scrub_queue"
210 #define DMU_POOL_SCRUB_MIN_TXG "scrub_min_txg"
212 #define DMU_POOL_SCRUB_MAX_TXG "scrub_max_txg"
213 /* 1x4 enum scrub_func */
214 #define DMU_POOL_SCRUB_FUNC "scrub_func"
216 #define DMU_POOL_SCRUB_ERRORS "scrub_errors"
219 * Allocate an object from this objset. The range of object numbers
220 * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode.
222 * The transaction must be assigned to a txg. The newly allocated
223 * object will be "held" in the transaction (ie. you can modify the
224 * newly allocated object in this transaction).
226 * dmu_object_alloc() chooses an object and returns it in *objectp.
228 * dmu_object_claim() allocates a specific object number. If that
229 * number is already allocated, it fails and returns EEXIST.
231 * Return 0 on success, or ENOSPC or EEXIST as specified above.
233 uint64_t dmu_object_alloc(objset_t
*os
, dmu_object_type_t ot
,
234 int blocksize
, dmu_object_type_t bonus_type
, int bonus_len
, dmu_tx_t
*tx
);
235 int dmu_object_claim(objset_t
*os
, uint64_t object
, dmu_object_type_t ot
,
236 int blocksize
, dmu_object_type_t bonus_type
, int bonus_len
, dmu_tx_t
*tx
);
237 int dmu_object_reclaim(objset_t
*os
, uint64_t object
, dmu_object_type_t ot
,
238 int blocksize
, dmu_object_type_t bonustype
, int bonuslen
, dmu_tx_t
*tx
);
241 * Free an object from this objset.
243 * The object's data will be freed as well (ie. you don't need to call
244 * dmu_free(object, 0, -1, tx)).
246 * The object need not be held in the transaction.
248 * If there are any holds on this object's buffers (via dmu_buf_hold()),
249 * or tx holds on the object (via dmu_tx_hold_object()), you can not
250 * free it; it fails and returns EBUSY.
252 * If the object is not allocated, it fails and returns ENOENT.
254 * Return 0 on success, or EBUSY or ENOENT as specified above.
256 int dmu_object_free(objset_t
*os
, uint64_t object
, dmu_tx_t
*tx
);
259 * Find the next allocated or free object.
261 * The objectp parameter is in-out. It will be updated to be the next
262 * object which is allocated. Ignore objects which have not been
263 * modified since txg.
265 * XXX Can only be called on a objset with no dirty data.
267 * Returns 0 on success, or ENOENT if there are no more objects.
269 int dmu_object_next(objset_t
*os
, uint64_t *objectp
,
270 boolean_t hole
, uint64_t txg
);
273 * Set the data blocksize for an object.
275 * The object cannot have any blocks allcated beyond the first. If
276 * the first block is allocated already, the new size must be greater
277 * than the current block size. If these conditions are not met,
278 * ENOTSUP will be returned.
280 * Returns 0 on success, or EBUSY if there are any holds on the object
281 * contents, or ENOTSUP as described above.
283 int dmu_object_set_blocksize(objset_t
*os
, uint64_t object
, uint64_t size
,
284 int ibs
, dmu_tx_t
*tx
);
287 * Set the checksum property on a dnode. The new checksum algorithm will
288 * apply to all newly written blocks; existing blocks will not be affected.
290 void dmu_object_set_checksum(objset_t
*os
, uint64_t object
, uint8_t checksum
,
294 * Set the compress property on a dnode. The new compression algorithm will
295 * apply to all newly written blocks; existing blocks will not be affected.
297 void dmu_object_set_compress(objset_t
*os
, uint64_t object
, uint8_t compress
,
301 * Decide how many copies of a given block we should make. Can be from
302 * 1 to SPA_DVAS_PER_BP.
304 int dmu_get_replication_level(struct objset_impl
*, struct zbookmark
*zb
,
305 dmu_object_type_t ot
);
307 * The bonus data is accessed more or less like a regular buffer.
308 * You must dmu_bonus_hold() to get the buffer, which will give you a
309 * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus
310 * data. As with any normal buffer, you must call dmu_buf_read() to
311 * read db_data, dmu_buf_will_dirty() before modifying it, and the
312 * object must be held in an assigned transaction before calling
313 * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus
314 * buffer as well. You must release your hold with dmu_buf_rele().
316 int dmu_bonus_hold(objset_t
*os
, uint64_t object
, void *tag
, dmu_buf_t
**);
317 int dmu_bonus_max(void);
318 int dmu_set_bonus(dmu_buf_t
*, int, dmu_tx_t
*);
321 * Obtain the DMU buffer from the specified object which contains the
322 * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so
323 * that it will remain in memory. You must release the hold with
324 * dmu_buf_rele(). You musn't access the dmu_buf_t after releasing your
325 * hold. You must have a hold on any dmu_buf_t* you pass to the DMU.
327 * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill
328 * on the returned buffer before reading or writing the buffer's
329 * db_data. The comments for those routines describe what particular
330 * operations are valid after calling them.
332 * The object number must be a valid, allocated object number.
334 int dmu_buf_hold(objset_t
*os
, uint64_t object
, uint64_t offset
,
335 void *tag
, dmu_buf_t
**);
336 void dmu_buf_add_ref(dmu_buf_t
*db
, void* tag
);
337 void dmu_buf_rele(dmu_buf_t
*db
, void *tag
);
338 uint64_t dmu_buf_refcount(dmu_buf_t
*db
);
341 * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a
342 * range of an object. A pointer to an array of dmu_buf_t*'s is
343 * returned (in *dbpp).
345 * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and
346 * frees the array. The hold on the array of buffers MUST be released
347 * with dmu_buf_rele_array. You can NOT release the hold on each buffer
348 * individually with dmu_buf_rele.
350 int dmu_buf_hold_array_by_bonus(dmu_buf_t
*db
, uint64_t offset
,
351 uint64_t length
, int read
, void *tag
, int *numbufsp
, dmu_buf_t
***dbpp
);
352 void dmu_buf_rele_array(dmu_buf_t
**, int numbufs
, void *tag
);
355 * Returns NULL on success, or the existing user ptr if it's already
358 * user_ptr is for use by the user and can be obtained via dmu_buf_get_user().
360 * user_data_ptr_ptr should be NULL, or a pointer to a pointer which
361 * will be set to db->db_data when you are allowed to access it. Note
362 * that db->db_data (the pointer) can change when you do dmu_buf_read(),
363 * dmu_buf_tryupgrade(), dmu_buf_will_dirty(), or dmu_buf_will_fill().
364 * *user_data_ptr_ptr will be set to the new value when it changes.
366 * If non-NULL, pageout func will be called when this buffer is being
367 * excised from the cache, so that you can clean up the data structure
368 * pointed to by user_ptr.
370 * dmu_evict_user() will call the pageout func for all buffers in a
371 * objset with a given pageout func.
373 void *dmu_buf_set_user(dmu_buf_t
*db
, void *user_ptr
, void *user_data_ptr_ptr
,
374 dmu_buf_evict_func_t
*pageout_func
);
376 * set_user_ie is the same as set_user, but request immediate eviction
377 * when hold count goes to zero.
379 void *dmu_buf_set_user_ie(dmu_buf_t
*db
, void *user_ptr
,
380 void *user_data_ptr_ptr
, dmu_buf_evict_func_t
*pageout_func
);
381 void *dmu_buf_update_user(dmu_buf_t
*db_fake
, void *old_user_ptr
,
382 void *user_ptr
, void *user_data_ptr_ptr
,
383 dmu_buf_evict_func_t
*pageout_func
);
384 void dmu_evict_user(objset_t
*os
, dmu_buf_evict_func_t
*func
);
387 * Returns the user_ptr set with dmu_buf_set_user(), or NULL if not set.
389 void *dmu_buf_get_user(dmu_buf_t
*db
);
392 * Indicate that you are going to modify the buffer's data (db_data).
394 * The transaction (tx) must be assigned to a txg (ie. you've called
395 * dmu_tx_assign()). The buffer's object must be held in the tx
396 * (ie. you've called dmu_tx_hold_object(tx, db->db_object)).
398 void dmu_buf_will_dirty(dmu_buf_t
*db
, dmu_tx_t
*tx
);
401 * You must create a transaction, then hold the objects which you will
402 * (or might) modify as part of this transaction. Then you must assign
403 * the transaction to a transaction group. Once the transaction has
404 * been assigned, you can modify buffers which belong to held objects as
405 * part of this transaction. You can't modify buffers before the
406 * transaction has been assigned; you can't modify buffers which don't
407 * belong to objects which this transaction holds; you can't hold
408 * objects once the transaction has been assigned. You may hold an
409 * object which you are going to free (with dmu_object_free()), but you
412 * You can abort the transaction before it has been assigned.
414 * Note that you may hold buffers (with dmu_buf_hold) at any time,
415 * regardless of transaction state.
418 #define DMU_NEW_OBJECT (-1ULL)
419 #define DMU_OBJECT_END (-1ULL)
421 dmu_tx_t
*dmu_tx_create(objset_t
*os
);
422 void dmu_tx_hold_write(dmu_tx_t
*tx
, uint64_t object
, uint64_t off
, int len
);
423 void dmu_tx_hold_free(dmu_tx_t
*tx
, uint64_t object
, uint64_t off
,
425 void dmu_tx_hold_zap(dmu_tx_t
*tx
, uint64_t object
, int add
, char *name
);
426 void dmu_tx_hold_bonus(dmu_tx_t
*tx
, uint64_t object
);
427 void dmu_tx_abort(dmu_tx_t
*tx
);
428 int dmu_tx_assign(dmu_tx_t
*tx
, uint64_t txg_how
);
429 void dmu_tx_wait(dmu_tx_t
*tx
);
430 void dmu_tx_commit(dmu_tx_t
*tx
);
433 * Free up the data blocks for a defined range of a file. If size is
434 * zero, the range from offset to end-of-file is freed.
436 int dmu_free_range(objset_t
*os
, uint64_t object
, uint64_t offset
,
437 uint64_t size
, dmu_tx_t
*tx
);
438 int dmu_free_long_range(objset_t
*os
, uint64_t object
, uint64_t offset
,
440 int dmu_free_object(objset_t
*os
, uint64_t object
);
443 * Convenience functions.
445 * Canfail routines will return 0 on success, or an errno if there is a
446 * nonrecoverable I/O error.
448 int dmu_read(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
450 void dmu_write(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
451 const void *buf
, dmu_tx_t
*tx
);
452 void dmu_prealloc(objset_t
*os
, uint64_t object
, uint64_t offset
, uint64_t size
,
454 int dmu_read_uio(objset_t
*os
, uint64_t object
, struct uio
*uio
, uint64_t size
);
455 int dmu_write_uio(objset_t
*os
, uint64_t object
, struct uio
*uio
, uint64_t size
,
457 int dmu_write_pages(objset_t
*os
, uint64_t object
, uint64_t offset
,
458 uint64_t size
, struct page
*pp
, dmu_tx_t
*tx
);
460 extern int zfs_prefetch_disable
;
463 * Asynchronously try to read in the data.
465 void dmu_prefetch(objset_t
*os
, uint64_t object
, uint64_t offset
,
468 typedef struct dmu_object_info
{
469 /* All sizes are in bytes. */
470 uint32_t doi_data_block_size
;
471 uint32_t doi_metadata_block_size
;
472 uint64_t doi_bonus_size
;
473 dmu_object_type_t doi_type
;
474 dmu_object_type_t doi_bonus_type
;
475 uint8_t doi_indirection
; /* 2 = dnode->indirect->data */
476 uint8_t doi_checksum
;
477 uint8_t doi_compress
;
479 /* Values below are number of 512-byte blocks. */
480 uint64_t doi_physical_blks
; /* data + metadata */
481 uint64_t doi_max_block_offset
;
484 typedef void arc_byteswap_func_t(void *buf
, size_t size
);
486 typedef struct dmu_object_type_info
{
487 arc_byteswap_func_t
*ot_byteswap
;
488 boolean_t ot_metadata
;
490 } dmu_object_type_info_t
;
492 extern const dmu_object_type_info_t dmu_ot
[DMU_OT_NUMTYPES
];
495 * Get information on a DMU object.
497 * Return 0 on success or ENOENT if object is not allocated.
499 * If doi is NULL, just indicates whether the object exists.
501 int dmu_object_info(objset_t
*os
, uint64_t object
, dmu_object_info_t
*doi
);
502 void dmu_object_info_from_dnode(struct dnode
*dn
, dmu_object_info_t
*doi
);
503 void dmu_object_info_from_db(dmu_buf_t
*db
, dmu_object_info_t
*doi
);
504 void dmu_object_size_from_db(dmu_buf_t
*db
, uint32_t *blksize
,
505 u_longlong_t
*nblk512
);
507 typedef struct dmu_objset_stats
{
508 uint64_t dds_num_clones
; /* number of clones of this */
509 uint64_t dds_creation_txg
;
511 dmu_objset_type_t dds_type
;
512 uint8_t dds_is_snapshot
;
513 uint8_t dds_inconsistent
;
514 char dds_origin
[MAXNAMELEN
];
515 } dmu_objset_stats_t
;
518 * Get stats on a dataset.
520 void dmu_objset_fast_stat(objset_t
*os
, dmu_objset_stats_t
*stat
);
523 * Add entries to the nvlist for all the objset's properties. See
524 * zfs_prop_table[] and zfs(1m) for details on the properties.
526 void dmu_objset_stats(objset_t
*os
, struct nvlist
*nv
);
529 * Get the space usage statistics for statvfs().
531 * refdbytes is the amount of space "referenced" by this objset.
532 * availbytes is the amount of space available to this objset, taking
533 * into account quotas & reservations, assuming that no other objsets
534 * use the space first. These values correspond to the 'referenced' and
535 * 'available' properties, described in the zfs(1m) manpage.
537 * usedobjs and availobjs are the number of objects currently allocated,
540 void dmu_objset_space(objset_t
*os
, uint64_t *refdbytesp
, uint64_t *availbytesp
,
541 uint64_t *usedobjsp
, uint64_t *availobjsp
);
544 * The fsid_guid is a 56-bit ID that can change to avoid collisions.
545 * (Contrast with the ds_guid which is a 64-bit ID that will never
546 * change, so there is a small probability that it will collide.)
548 uint64_t dmu_objset_fsid_guid(objset_t
*os
);
550 int dmu_objset_is_snapshot(objset_t
*os
);
552 extern struct spa
*dmu_objset_spa(objset_t
*os
);
553 extern struct zilog
*dmu_objset_zil(objset_t
*os
);
554 extern struct dsl_pool
*dmu_objset_pool(objset_t
*os
);
555 extern struct dsl_dataset
*dmu_objset_ds(objset_t
*os
);
556 extern void dmu_objset_name(objset_t
*os
, char *buf
);
557 extern dmu_objset_type_t
dmu_objset_type(objset_t
*os
);
558 extern uint64_t dmu_objset_id(objset_t
*os
);
559 extern int dmu_snapshot_list_next(objset_t
*os
, int namelen
, char *name
,
560 uint64_t *id
, uint64_t *offp
, boolean_t
*case_conflict
);
561 extern int dmu_snapshot_realname(objset_t
*os
, char *name
, char *real
,
562 int maxlen
, boolean_t
*conflict
);
563 extern int dmu_dir_list_next(objset_t
*os
, int namelen
, char *name
,
564 uint64_t *idp
, uint64_t *offp
);
565 extern void dmu_objset_set_user(objset_t
*os
, void *user_ptr
);
566 extern void *dmu_objset_get_user(objset_t
*os
);
569 * Return the txg number for the given assigned transaction.
571 uint64_t dmu_tx_get_txg(dmu_tx_t
*tx
);
575 * If a parent zio is provided this function initiates a write on the
576 * provided buffer as a child of the parent zio.
577 * In the absence of a parent zio, the write is completed synchronously.
578 * At write completion, blk is filled with the bp of the written block.
579 * Note that while the data covered by this function will be on stable
580 * storage when the write completes this new data does not become a
581 * permanent part of the file until the associated transaction commits.
583 typedef void dmu_sync_cb_t(dmu_buf_t
*db
, void *arg
);
584 int dmu_sync(struct zio
*zio
, dmu_buf_t
*db
,
585 struct blkptr
*bp
, uint64_t txg
, dmu_sync_cb_t
*done
, void *arg
);
588 * Find the next hole or data block in file starting at *off
589 * Return found offset in *off. Return ESRCH for end of file.
591 int dmu_offset_next(objset_t
*os
, uint64_t object
, boolean_t hole
,
595 * Initial setup and final teardown.
597 extern void dmu_init(void);
598 extern void dmu_fini(void);
600 typedef void (*dmu_traverse_cb_t
)(objset_t
*os
, void *arg
, struct blkptr
*bp
,
601 uint64_t object
, uint64_t offset
, int len
);
602 void dmu_traverse_objset(objset_t
*os
, uint64_t txg_start
,
603 dmu_traverse_cb_t cb
, void *arg
);
605 int dmu_sendbackup(objset_t
*tosnap
, objset_t
*fromsnap
, boolean_t fromorigin
,
606 struct vnode
*vp
, offset_t
*off
);
608 typedef struct dmu_recv_cookie
{
610 * This structure is opaque!
612 * If logical and real are different, we are recving the stream
613 * into the "real" temporary clone, and then switching it with
614 * the "logical" target.
616 struct dsl_dataset
*drc_logical_ds
;
617 struct dsl_dataset
*drc_real_ds
;
618 struct drr_begin
*drc_drrb
;
624 int dmu_recv_begin(char *tofs
, char *tosnap
, struct drr_begin
*,
625 boolean_t force
, objset_t
*origin
, boolean_t online
, dmu_recv_cookie_t
*);
626 int dmu_recv_stream(dmu_recv_cookie_t
*drc
, struct vnode
*vp
, offset_t
*voffp
);
627 int dmu_recv_end(dmu_recv_cookie_t
*drc
);
628 void dmu_recv_abort_cleanup(dmu_recv_cookie_t
*drc
);
631 #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */
632 extern uint64_t zfs_crc64_table
[256];
638 #endif /* _SYS_DMU_H */