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 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
29 #include <sys/types.h>
41 * Each objset has its own intent log. The log header (zil_header_t)
42 * for objset N's intent log is kept in the Nth object of the SPA's
43 * intent_log objset. The log header points to a chain of log blocks,
44 * each of which contains log records (i.e., transactions) followed by
45 * a log block trailer (zil_trailer_t). The format of a log record
46 * depends on the record (or transaction) type, but all records begin
47 * with a common structure that defines the type, length, and txg.
51 * Intent log header - this on disk structure holds fields to manage
52 * the log. All fields are 64 bit to easily handle cross architectures.
54 typedef struct zil_header {
55 uint64_t zh_claim_txg; /* txg in which log blocks were claimed */
56 uint64_t zh_replay_seq; /* highest replayed sequence number */
57 blkptr_t zh_log; /* log chain */
58 uint64_t zh_claim_seq; /* highest claimed sequence number */
59 uint64_t zh_flags; /* header flags */
64 * zh_flags bit settings
66 #define ZIL_REPLAY_NEEDED 0x1 /* replay needed - internal only */
69 * Log block trailer - structure at the end of the header and each log block
71 * The zit_bt contains a zbt_cksum which for the intent log is
72 * the sequence number of this log block. A seq of 0 is invalid.
73 * The zbt_cksum is checked by the SPA against the sequence
74 * number passed in the blk_cksum field of the blkptr_t
76 typedef struct zil_trailer {
78 blkptr_t zit_next_blk; /* next block in chain */
79 uint64_t zit_nused; /* bytes in log block used */
80 zio_block_tail_t zit_bt; /* block trailer */
83 #define ZIL_MIN_BLKSZ 4096ULL
84 #define ZIL_MAX_BLKSZ SPA_MAXBLOCKSIZE
85 #define ZIL_BLK_DATA_SZ(lwb) ((lwb)->lwb_sz - sizeof (zil_trailer_t))
88 * The words of a log block checksum.
90 #define ZIL_ZC_GUID_0 0
91 #define ZIL_ZC_GUID_1 1
92 #define ZIL_ZC_OBJSET 2
95 typedef enum zil_create {
102 * size of xvattr log section.
103 * its composed of lr_attr_t + xvattr bitmap + 2 64 bit timestamps
104 * for create time and a single 64 bit integer for all of the attributes,
105 * and 4 64 bit integers (32 bytes) for the scanstamp.
109 #define ZIL_XVAT_SIZE(mapsize) \
110 sizeof (lr_attr_t) + (sizeof (uint32_t) * (mapsize - 1)) + \
111 (sizeof (uint64_t) * 7)
114 * Size of ACL in log. The ACE data is padded out to properly align
115 * on 8 byte boundary.
118 #define ZIL_ACE_LENGTH(x) (roundup(x, sizeof (uint64_t)))
121 * Intent log transaction types and record structures
123 #define TX_CREATE 1 /* Create file */
124 #define TX_MKDIR 2 /* Make directory */
125 #define TX_MKXATTR 3 /* Make XATTR directory */
126 #define TX_SYMLINK 4 /* Create symbolic link to a file */
127 #define TX_REMOVE 5 /* Remove file */
128 #define TX_RMDIR 6 /* Remove directory */
129 #define TX_LINK 7 /* Create hard link to a file */
130 #define TX_RENAME 8 /* Rename a file */
131 #define TX_WRITE 9 /* File write */
132 #define TX_TRUNCATE 10 /* Truncate a file */
133 #define TX_SETATTR 11 /* Set file attributes */
134 #define TX_ACL_V0 12 /* Set old formatted ACL */
135 #define TX_ACL 13 /* Set ACL */
136 #define TX_CREATE_ACL 14 /* create with ACL */
137 #define TX_CREATE_ATTR 15 /* create + attrs */
138 #define TX_CREATE_ACL_ATTR 16 /* create with ACL + attrs */
139 #define TX_MKDIR_ACL 17 /* mkdir with ACL */
140 #define TX_MKDIR_ATTR 18 /* mkdir with attr */
141 #define TX_MKDIR_ACL_ATTR 19 /* mkdir with ACL + attrs */
142 #define TX_WRITE2 20 /* dmu_sync EALREADY write */
143 #define TX_MAX_TYPE 21 /* Max transaction type */
146 * The transactions for mkdir, symlink, remove, rmdir, link, and rename
147 * may have the following bit set, indicating the original request
148 * specified case-insensitive handling of names.
150 #define TX_CI ((uint64_t)0x1 << 63) /* case-insensitive behavior requested */
153 * Format of log records.
154 * The fields are carefully defined to allow them to be aligned
155 * and sized the same on sparc & intel architectures.
156 * Each log record has a common structure at the beginning.
158 * Note, lrc_seq holds two different sequence numbers. Whilst in memory
159 * it contains the transaction sequence number. The log record on
160 * disk holds the sequence number of all log records which is used to
161 * ensure we don't replay the same record. The two sequence numbers are
162 * different because the transactions can now be pushed out of order.
164 typedef struct { /* common log record header */
165 uint64_t lrc_txtype; /* intent log transaction type */
166 uint64_t lrc_reclen; /* transaction record length */
167 uint64_t lrc_txg; /* dmu transaction group number */
168 uint64_t lrc_seq; /* see comment above */
172 * Handle option extended vattr attributes.
174 * Whenever new attributes are added the version number
175 * will need to be updated as will code in
176 * zfs_log.c and zfs_replay.c
179 uint32_t lr_attr_masksize; /* number of elements in array */
180 uint32_t lr_attr_bitmap; /* First entry of array */
181 /* remainder of array and any additional fields */
185 * log record for creates without optional ACL.
186 * This log record does support optional xvattr_t attributes.
189 lr_t lr_common; /* common portion of log record */
190 uint64_t lr_doid; /* object id of directory */
191 uint64_t lr_foid; /* object id of created file object */
192 uint64_t lr_mode; /* mode of object */
193 uint64_t lr_uid; /* uid of object */
194 uint64_t lr_gid; /* gid of object */
195 uint64_t lr_gen; /* generation (txg of creation) */
196 uint64_t lr_crtime[2]; /* creation time */
197 uint64_t lr_rdev; /* rdev of object to create */
198 /* name of object to create follows this */
199 /* for symlinks, link content follows name */
200 /* for creates with xvattr data, the name follows the xvattr info */
204 * FUID ACL record will be an array of ACEs from the original ACL.
205 * If this array includes ephemeral IDs, the record will also include
206 * an array of log-specific FUIDs to replace the ephemeral IDs.
207 * Only one copy of each unique domain will be present, so the log-specific
208 * FUIDs will use an index into a compressed domain table. On replay this
209 * information will be used to construct real FUIDs (and bypass idmap,
210 * since it may not be available).
214 * Log record for creates with optional ACL
215 * This log record is also used for recording any FUID
216 * information needed for replaying the create. If the
217 * file doesn't have any actual ACEs then the lr_aclcnt
221 lr_create_t lr_create; /* common create portion */
222 uint64_t lr_aclcnt; /* number of ACEs in ACL */
223 uint64_t lr_domcnt; /* number of unique domains */
224 uint64_t lr_fuidcnt; /* number of real fuids */
225 uint64_t lr_acl_bytes; /* number of bytes in ACL */
226 uint64_t lr_acl_flags; /* ACL flags */
227 /* lr_acl_bytes number of variable sized ace's follows */
228 /* if create is also setting xvattr's, then acl data follows xvattr */
229 /* if ACE FUIDs are needed then they will follow the xvattr_t */
230 /* Following the FUIDs will be the domain table information. */
231 /* The FUIDs for the owner and group will be in the lr_create */
232 /* portion of the record. */
233 /* name follows ACL data */
237 lr_t lr_common; /* common portion of log record */
238 uint64_t lr_doid; /* obj id of directory */
239 /* name of object to remove follows this */
243 lr_t lr_common; /* common portion of log record */
244 uint64_t lr_doid; /* obj id of directory */
245 uint64_t lr_link_obj; /* obj id of link */
246 /* name of object to link follows this */
250 lr_t lr_common; /* common portion of log record */
251 uint64_t lr_sdoid; /* obj id of source directory */
252 uint64_t lr_tdoid; /* obj id of target directory */
253 /* 2 strings: names of source and destination follow this */
257 lr_t lr_common; /* common portion of log record */
258 uint64_t lr_foid; /* file object to write */
259 uint64_t lr_offset; /* offset to write to */
260 uint64_t lr_length; /* user data length to write */
261 uint64_t lr_blkoff; /* offset represented by lr_blkptr */
262 blkptr_t lr_blkptr; /* spa block pointer for replay */
263 /* write data will follow for small writes */
267 lr_t lr_common; /* common portion of log record */
268 uint64_t lr_foid; /* object id of file to truncate */
269 uint64_t lr_offset; /* offset to truncate from */
270 uint64_t lr_length; /* length to truncate */
274 lr_t lr_common; /* common portion of log record */
275 uint64_t lr_foid; /* file object to change attributes */
276 uint64_t lr_mask; /* mask of attributes to set */
277 uint64_t lr_mode; /* mode to set */
278 uint64_t lr_uid; /* uid to set */
279 uint64_t lr_gid; /* gid to set */
280 uint64_t lr_size; /* size to set */
281 uint64_t lr_atime[2]; /* access time */
282 uint64_t lr_mtime[2]; /* modification time */
283 /* optional attribute lr_attr_t may be here */
287 lr_t lr_common; /* common portion of log record */
288 uint64_t lr_foid; /* obj id of file */
289 uint64_t lr_aclcnt; /* number of acl entries */
290 /* lr_aclcnt number of ace_t entries follow this */
294 lr_t lr_common; /* common portion of log record */
295 uint64_t lr_foid; /* obj id of file */
296 uint64_t lr_aclcnt; /* number of ACEs in ACL */
297 uint64_t lr_domcnt; /* number of unique domains */
298 uint64_t lr_fuidcnt; /* number of real fuids */
299 uint64_t lr_acl_bytes; /* number of bytes in ACL */
300 uint64_t lr_acl_flags; /* ACL flags */
301 /* lr_acl_bytes number of variable sized ace's follows */
305 * ZIL structure definitions, interface function prototype and globals.
309 * ZFS intent log transaction structure
312 WR_INDIRECT, /* indirect - a large write (dmu_sync() data */
313 /* and put blkptr in log, rather than actual data) */
314 WR_COPIED, /* immediate - data is copied into lr_write_t */
315 WR_NEED_COPY, /* immediate - data needs to be copied if pushed */
319 list_node_t itx_node; /* linkage on zl_itx_list */
320 void *itx_private; /* type-specific opaque data */
321 itx_wr_state_t itx_wr_state; /* write state */
322 uint8_t itx_sync; /* synchronous transaction */
323 uint64_t itx_sod; /* record size on disk */
324 lr_t itx_lr; /* common part of log record */
325 /* followed by type-specific part of lr_xx_t and its immediate data */
330 * zgd_t is passed through dmu_sync() to the callback routine zfs_get_done()
331 * to handle the cleanup of the dmu_sync() buffer write
334 zilog_t *zgd_zilog; /* zilog */
335 blkptr_t *zgd_bp; /* block pointer */
336 struct rl *zgd_rl; /* range lock */
340 typedef void zil_parse_blk_func_t(zilog_t *zilog, blkptr_t *bp, void *arg,
342 typedef void zil_parse_lr_func_t(zilog_t *zilog, lr_t *lr, void *arg,
344 typedef int zil_replay_func_t();
345 typedef int zil_get_data_t(void *arg, lr_write_t *lr, char *dbuf, zio_t *zio);
347 extern uint64_t zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func,
348 zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg);
350 extern void zil_init(void);
351 extern void zil_fini(void);
353 extern zilog_t *zil_alloc(objset_t *os, zil_header_t *zh_phys);
354 extern void zil_free(zilog_t *zilog);
356 extern zilog_t *zil_open(objset_t *os, zil_get_data_t *get_data);
357 extern void zil_close(zilog_t *zilog);
359 extern void zil_replay(objset_t *os, void *arg,
360 zil_replay_func_t *replay_func[TX_MAX_TYPE]);
361 extern void zil_destroy(zilog_t *zilog, boolean_t keep_first);
362 extern void zil_rollback_destroy(zilog_t *zilog, dmu_tx_t *tx);
364 extern itx_t *zil_itx_create(uint64_t txtype, size_t lrsize);
365 extern uint64_t zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx);
367 extern void zil_commit(zilog_t *zilog, uint64_t seq, uint64_t oid);
369 extern int zil_claim(char *osname, void *txarg);
370 extern int zil_check_log_chain(char *osname, void *txarg);
371 extern int zil_clear_log_chain(char *osname, void *txarg);
372 extern void zil_sync(zilog_t *zilog, dmu_tx_t *tx);
373 extern void zil_clean(zilog_t *zilog);
374 extern int zil_is_committed(zilog_t *zilog);
376 extern int zil_suspend(zilog_t *zilog);
377 extern void zil_resume(zilog_t *zilog);
379 extern void zil_add_block(zilog_t *zilog, blkptr_t *bp);
380 extern void zil_get_replay_data(zilog_t *zilog, lr_write_t *lr);
382 extern int zil_disable;
388 #endif /* _SYS_ZIL_H */