aboutsummaryrefslogtreecommitdiffstats
path: root/include/sys/zil.h
blob: ec89de38d443abdea313beb8b1056929d0b76f13 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
 */

/* Portions Copyright 2010 Robert Milkowski */

#ifndef	_SYS_ZIL_H
#define	_SYS_ZIL_H

#include <sys/types.h>
#include <sys/spa.h>
#include <sys/zio.h>
#include <sys/dmu.h>
#include <sys/zio_crypt.h>

#ifdef	__cplusplus
extern "C" {
#endif

struct dsl_pool;
struct dsl_dataset;
struct lwb;

/*
 * Intent log format:
 *
 * Each objset has its own intent log.  The log header (zil_header_t)
 * for objset N's intent log is kept in the Nth object of the SPA's
 * intent_log objset.  The log header points to a chain of log blocks,
 * each of which contains log records (i.e., transactions) followed by
 * a log block trailer (zil_trailer_t).  The format of a log record
 * depends on the record (or transaction) type, but all records begin
 * with a common structure that defines the type, length, and txg.
 */

/*
 * Intent log header - this on disk structure holds fields to manage
 * the log.  All fields are 64 bit to easily handle cross architectures.
 */
typedef struct zil_header {
	uint64_t zh_claim_txg;	/* txg in which log blocks were claimed */
	uint64_t zh_replay_seq;	/* highest replayed sequence number */
	blkptr_t zh_log;	/* log chain */
	uint64_t zh_claim_blk_seq; /* highest claimed block sequence number */
	uint64_t zh_flags;	/* header flags */
	uint64_t zh_claim_lr_seq; /* highest claimed lr sequence number */
	uint64_t zh_pad[3];
} zil_header_t;

/*
 * zh_flags bit settings
 */
#define	ZIL_REPLAY_NEEDED	0x1	/* replay needed - internal only */
#define	ZIL_CLAIM_LR_SEQ_VALID	0x2	/* zh_claim_lr_seq field is valid */

/*
 * Log block chaining.
 *
 * Log blocks are chained together. Originally they were chained at the
 * end of the block. For performance reasons the chain was moved to the
 * beginning of the block which allows writes for only the data being used.
 * The older position is supported for backwards compatibility.
 *
 * The zio_eck_t contains a zec_cksum which for the intent log is
 * the sequence number of this log block. A seq of 0 is invalid.
 * The zec_cksum is checked by the SPA against the sequence
 * number passed in the blk_cksum field of the blkptr_t
 */
typedef struct zil_chain {
	uint64_t zc_pad;
	blkptr_t zc_next_blk;	/* next block in chain */
	uint64_t zc_nused;	/* bytes in log block used */
	zio_eck_t zc_eck;	/* block trailer */
} zil_chain_t;

#define	ZIL_MIN_BLKSZ	4096ULL

/*
 * ziltest is by and large an ugly hack, but very useful in
 * checking replay without tedious work.
 * When running ziltest we want to keep all itx's and so maintain
 * a single list in the zl_itxg[] that uses a high txg: ZILTEST_TXG
 * We subtract TXG_CONCURRENT_STATES to allow for common code.
 */
#define	ZILTEST_TXG (UINT64_MAX - TXG_CONCURRENT_STATES)

/*
 * The words of a log block checksum.
 */
#define	ZIL_ZC_GUID_0	0
#define	ZIL_ZC_GUID_1	1
#define	ZIL_ZC_OBJSET	2
#define	ZIL_ZC_SEQ	3

typedef enum zil_create {
	Z_FILE,
	Z_DIR,
	Z_XATTRDIR,
} zil_create_t;

/*
 * size of xvattr log section.
 * its composed of lr_attr_t + xvattr bitmap + 2 64 bit timestamps
 * for create time and a single 64 bit integer for all of the attributes,
 * and 4 64 bit integers (32 bytes) for the scanstamp.
 *
 */

#define	ZIL_XVAT_SIZE(mapsize) \
	sizeof (lr_attr_t) + (sizeof (uint32_t) * (mapsize - 1)) + \
	(sizeof (uint64_t) * 7)

/*
 * Size of ACL in log.  The ACE data is padded out to properly align
 * on 8 byte boundary.
 */

#define	ZIL_ACE_LENGTH(x)	(roundup(x, sizeof (uint64_t)))

/*
 * Intent log transaction types and record structures
 */
#define	TX_COMMIT		0	/* Commit marker (no on-disk state) */
#define	TX_CREATE		1	/* Create file */
#define	TX_MKDIR		2	/* Make directory */
#define	TX_MKXATTR		3	/* Make XATTR directory */
#define	TX_SYMLINK		4	/* Create symbolic link to a file */
#define	TX_REMOVE		5	/* Remove file */
#define	TX_RMDIR		6	/* Remove directory */
#define	TX_LINK			7	/* Create hard link to a file */
#define	TX_RENAME		8	/* Rename a file */
#define	TX_WRITE		9	/* File write */
#define	TX_TRUNCATE		10	/* Truncate a file */
#define	TX_SETATTR		11	/* Set file attributes */
#define	TX_ACL_V0		12	/* Set old formatted ACL */
#define	TX_ACL			13	/* Set ACL */
#define	TX_CREATE_ACL		14	/* create with ACL */
#define	TX_CREATE_ATTR		15	/* create + attrs */
#define	TX_CREATE_ACL_ATTR 	16	/* create with ACL + attrs */
#define	TX_MKDIR_ACL		17	/* mkdir with ACL */
#define	TX_MKDIR_ATTR		18	/* mkdir with attr */
#define	TX_MKDIR_ACL_ATTR	19	/* mkdir with ACL + attrs */
#define	TX_WRITE2		20	/* dmu_sync EALREADY write */
#define	TX_MAX_TYPE		21	/* Max transaction type */

/*
 * The transactions for mkdir, symlink, remove, rmdir, link, and rename
 * may have the following bit set, indicating the original request
 * specified case-insensitive handling of names.
 */
#define	TX_CI	((uint64_t)0x1 << 63) /* case-insensitive behavior requested */

/*
 * Transactions for write, truncate, setattr, acl_v0, and acl can be logged
 * out of order.  For convenience in the code, all such records must have
 * lr_foid at the same offset.
 */
#define	TX_OOO(txtype)			\
	((txtype) == TX_WRITE ||	\
	(txtype) == TX_TRUNCATE ||	\
	(txtype) == TX_SETATTR ||	\
	(txtype) == TX_ACL_V0 ||	\
	(txtype) == TX_ACL ||		\
	(txtype) == TX_WRITE2)

/*
 * The number of dnode slots consumed by the object is stored in the 8
 * unused upper bits of the object ID. We subtract 1 from the value
 * stored on disk for compatibility with implementations that don't
 * support large dnodes. The slot count for a single-slot dnode will
 * contain 0 for those bits to preserve the log record format for
 * "small" dnodes.
 */
#define	LR_FOID_GET_SLOTS(oid) (BF64_GET((oid), 56, 8) + 1)
#define	LR_FOID_SET_SLOTS(oid, x) BF64_SET((oid), 56, 8, (x) - 1)
#define	LR_FOID_GET_OBJ(oid) BF64_GET((oid), 0, DN_MAX_OBJECT_SHIFT)
#define	LR_FOID_SET_OBJ(oid, x) BF64_SET((oid), 0, DN_MAX_OBJECT_SHIFT, (x))

/*
 * Format of log records.
 * The fields are carefully defined to allow them to be aligned
 * and sized the same on sparc & intel architectures.
 * Each log record has a common structure at the beginning.
 *
 * The log record on disk (lrc_seq) holds the sequence number of all log
 * records which is used to ensure we don't replay the same record.
 */
typedef struct {			/* common log record header */
	uint64_t	lrc_txtype;	/* intent log transaction type */
	uint64_t	lrc_reclen;	/* transaction record length */
	uint64_t	lrc_txg;	/* dmu transaction group number */
	uint64_t	lrc_seq;	/* see comment above */
} lr_t;

/*
 * Common start of all out-of-order record types (TX_OOO() above).
 */
typedef struct {
	lr_t		lr_common;	/* common portion of log record */
	uint64_t	lr_foid;	/* object id */
} lr_ooo_t;

/*
 * Handle option extended vattr attributes.
 *
 * Whenever new attributes are added the version number
 * will need to be updated as will code in
 * zfs_log.c and zfs_replay.c
 */
typedef struct {
	uint32_t	lr_attr_masksize; /* number of elements in array */
	uint32_t	lr_attr_bitmap; /* First entry of array */
	/* remainder of array and any additional fields */
} lr_attr_t;

/*
 * log record for creates without optional ACL.
 * This log record does support optional xvattr_t attributes.
 */
typedef struct {
	lr_t		lr_common;	/* common portion of log record */
	uint64_t	lr_doid;	/* object id of directory */
	uint64_t	lr_foid;	/* object id of created file object */
	uint64_t	lr_mode;	/* mode of object */
	uint64_t	lr_uid;		/* uid of object */
	uint64_t	lr_gid;		/* gid of object */
	uint64_t	lr_gen;		/* generation (txg of creation) */
	uint64_t	lr_crtime[2];	/* creation time */
	uint64_t	lr_rdev;	/* rdev of object to create */
	/* name of object to create follows this */
	/* for symlinks, link content follows name */
	/* for creates with xvattr data, the name follows the xvattr info */
} lr_create_t;

/*
 * FUID ACL record will be an array of ACEs from the original ACL.
 * If this array includes ephemeral IDs, the record will also include
 * an array of log-specific FUIDs to replace the ephemeral IDs.
 * Only one copy of each unique domain will be present, so the log-specific
 * FUIDs will use an index into a compressed domain table.  On replay this
 * information will be used to construct real FUIDs (and bypass idmap,
 * since it may not be available).
 */

/*
 * Log record for creates with optional ACL
 * This log record is also used for recording any FUID
 * information needed for replaying the create.  If the
 * file doesn't have any actual ACEs then the lr_aclcnt
 * would be zero.
 *
 * After lr_acl_flags, there are a lr_acl_bytes number of variable sized ace's.
 * If create is also setting xvattr's, then acl data follows xvattr.
 * If ACE FUIDs are needed then they will follow the xvattr_t.  Following
 * the FUIDs will be the domain table information.  The FUIDs for the owner
 * and group will be in lr_create.  Name follows ACL data.
 */
typedef struct {
	lr_create_t	lr_create;	/* common create portion */
	uint64_t	lr_aclcnt;	/* number of ACEs in ACL */
	uint64_t	lr_domcnt;	/* number of unique domains */
	uint64_t	lr_fuidcnt;	/* number of real fuids */
	uint64_t	lr_acl_bytes;	/* number of bytes in ACL */
	uint64_t	lr_acl_flags;	/* ACL flags */
} lr_acl_create_t;

typedef struct {
	lr_t		lr_common;	/* common portion of log record */
	uint64_t	lr_doid;	/* obj id of directory */
	/* name of object to remove follows this */
} lr_remove_t;

typedef struct {
	lr_t		lr_common;	/* common portion of log record */
	uint64_t	lr_doid;	/* obj id of directory */
	uint64_t	lr_link_obj;	/* obj id of link */
	/* name of object to link follows this */
} lr_link_t;

typedef struct {
	lr_t		lr_common;	/* common portion of log record */
	uint64_t	lr_sdoid;	/* obj id of source directory */
	uint64_t	lr_tdoid;	/* obj id of target directory */
	/* 2 strings: names of source and destination follow this */
} lr_rename_t;

typedef struct {
	lr_t		lr_common;	/* common portion of log record */
	uint64_t	lr_foid;	/* file object to write */
	uint64_t	lr_offset;	/* offset to write to */
	uint64_t	lr_length;	/* user data length to write */
	uint64_t	lr_blkoff;	/* no longer used */
	blkptr_t	lr_blkptr;	/* spa block pointer for replay */
	/* write data will follow for small writes */
} lr_write_t;

typedef struct {
	lr_t		lr_common;	/* common portion of log record */
	uint64_t	lr_foid;	/* object id of file to truncate */
	uint64_t	lr_offset;	/* offset to truncate from */
	uint64_t	lr_length;	/* length to truncate */
} lr_truncate_t;

typedef struct {
	lr_t		lr_common;	/* common portion of log record */
	uint64_t	lr_foid;	/* file object to change attributes */
	uint64_t	lr_mask;	/* mask of attributes to set */
	uint64_t	lr_mode;	/* mode to set */
	uint64_t	lr_uid;		/* uid to set */
	uint64_t	lr_gid;		/* gid to set */
	uint64_t	lr_size;	/* size to set */
	uint64_t	lr_atime[2];	/* access time */
	uint64_t	lr_mtime[2];	/* modification time */
	/* optional attribute lr_attr_t may be here */
} lr_setattr_t;

typedef struct {
	lr_t		lr_common;	/* common portion of log record */
	uint64_t	lr_foid;	/* obj id of file */
	uint64_t	lr_aclcnt;	/* number of acl entries */
	/* lr_aclcnt number of ace_t entries follow this */
} lr_acl_v0_t;

typedef struct {
	lr_t		lr_common;	/* common portion of log record */
	uint64_t	lr_foid;	/* obj id of file */
	uint64_t	lr_aclcnt;	/* number of ACEs in ACL */
	uint64_t	lr_domcnt;	/* number of unique domains */
	uint64_t	lr_fuidcnt;	/* number of real fuids */
	uint64_t	lr_acl_bytes;	/* number of bytes in ACL */
	uint64_t	lr_acl_flags;	/* ACL flags */
	/* lr_acl_bytes number of variable sized ace's follows */
} lr_acl_t;

/*
 * ZIL structure definitions, interface function prototype and globals.
 */

/*
 * Writes are handled in three different ways:
 *
 * WR_INDIRECT:
 *    In this mode, if we need to commit the write later, then the block
 *    is immediately written into the file system (using dmu_sync),
 *    and a pointer to the block is put into the log record.
 *    When the txg commits the block is linked in.
 *    This saves additionally writing the data into the log record.
 *    There are a few requirements for this to occur:
 *	- write is greater than zfs/zvol_immediate_write_sz
 *	- not using slogs (as slogs are assumed to always be faster
 *	  than writing into the main pool)
 *	- the write occupies only one block
 * WR_COPIED:
 *    If we know we'll immediately be committing the
 *    transaction (O_SYNC or O_DSYNC), then we allocate a larger
 *    log record here for the data and copy the data in.
 * WR_NEED_COPY:
 *    Otherwise we don't allocate a buffer, and *if* we need to
 *    flush the write later then a buffer is allocated and
 *    we retrieve the data using the dmu.
 */
typedef enum {
	WR_INDIRECT,	/* indirect - a large write (dmu_sync() data */
			/* and put blkptr in log, rather than actual data) */
	WR_COPIED,	/* immediate - data is copied into lr_write_t */
	WR_NEED_COPY,	/* immediate - data needs to be copied if pushed */
	WR_NUM_STATES	/* number of states */
} itx_wr_state_t;

typedef void (*zil_callback_t)(void *data);

typedef struct itx {
	list_node_t	itx_node;	/* linkage on zl_itx_list */
	void		*itx_private;	/* type-specific opaque data */
	itx_wr_state_t	itx_wr_state;	/* write state */
	uint8_t		itx_sync;	/* synchronous transaction */
	zil_callback_t	itx_callback;   /* Called when the itx is persistent */
	void		*itx_callback_data; /* User data for the callback */
	size_t		itx_size;	/* allocated itx structure size */
	uint64_t	itx_oid;	/* object id */
	lr_t		itx_lr;		/* common part of log record */
	/* followed by type-specific part of lr_xx_t and its immediate data */
} itx_t;

/*
 * Used for zil kstat.
 */
typedef struct zil_stats {
	/*
	 * Number of times a ZIL commit (e.g. fsync) has been requested.
	 */
	kstat_named_t zil_commit_count;

	/*
	 * Number of times the ZIL has been flushed to stable storage.
	 * This is less than zil_commit_count when commits are "merged"
	 * (see the documentation above zil_commit()).
	 */
	kstat_named_t zil_commit_writer_count;

	/*
	 * Number of transactions (reads, writes, renames, etc.)
	 * that have been committed.
	 */
	kstat_named_t zil_itx_count;

	/*
	 * See the documentation for itx_wr_state_t above.
	 * Note that "bytes" accumulates the length of the transactions
	 * (i.e. data), not the actual log record sizes.
	 */
	kstat_named_t zil_itx_indirect_count;
	kstat_named_t zil_itx_indirect_bytes;
	kstat_named_t zil_itx_copied_count;
	kstat_named_t zil_itx_copied_bytes;
	kstat_named_t zil_itx_needcopy_count;
	kstat_named_t zil_itx_needcopy_bytes;

	/*
	 * Transactions which have been allocated to the "normal"
	 * (i.e. not slog) storage pool. Note that "bytes" accumulate
	 * the actual log record sizes - which do not include the actual
	 * data in case of indirect writes.
	 */
	kstat_named_t zil_itx_metaslab_normal_count;
	kstat_named_t zil_itx_metaslab_normal_bytes;

	/*
	 * Transactions which have been allocated to the "slog" storage pool.
	 * If there are no separate log devices, this is the same as the
	 * "normal" pool.
	 */
	kstat_named_t zil_itx_metaslab_slog_count;
	kstat_named_t zil_itx_metaslab_slog_bytes;
} zil_stats_t;

extern zil_stats_t zil_stats;

#define	ZIL_STAT_INCR(stat, val) \
    atomic_add_64(&zil_stats.stat.value.ui64, (val));
#define	ZIL_STAT_BUMP(stat) \
    ZIL_STAT_INCR(stat, 1);

typedef int zil_parse_blk_func_t(zilog_t *zilog, const blkptr_t *bp, void *arg,
    uint64_t txg);
typedef int zil_parse_lr_func_t(zilog_t *zilog, const lr_t *lr, void *arg,
    uint64_t txg);
typedef int zil_replay_func_t(void *arg1, void *arg2, boolean_t byteswap);
typedef int zil_get_data_t(void *arg, lr_write_t *lr, char *dbuf,
    struct lwb *lwb, zio_t *zio);

extern int zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func,
    zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg,
    boolean_t decrypt);

extern void	zil_init(void);
extern void	zil_fini(void);

extern zilog_t	*zil_alloc(objset_t *os, zil_header_t *zh_phys);
extern void	zil_free(zilog_t *zilog);

extern zilog_t	*zil_open(objset_t *os, zil_get_data_t *get_data);
extern void	zil_close(zilog_t *zilog);

extern void	zil_replay(objset_t *os, void *arg,
    zil_replay_func_t *replay_func[TX_MAX_TYPE]);
extern boolean_t zil_replaying(zilog_t *zilog, dmu_tx_t *tx);
extern void	zil_destroy(zilog_t *zilog, boolean_t keep_first);
extern void	zil_destroy_sync(zilog_t *zilog, dmu_tx_t *tx);

extern itx_t	*zil_itx_create(uint64_t txtype, size_t lrsize);
extern void	zil_itx_destroy(itx_t *itx);
extern void	zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx);

extern void	zil_async_to_sync(zilog_t *zilog, uint64_t oid);
extern void	zil_commit(zilog_t *zilog, uint64_t oid);
extern void	zil_commit_impl(zilog_t *zilog, uint64_t oid);
extern void	zil_remove_async(zilog_t *zilog, uint64_t oid);

extern int	zil_reset(const char *osname, void *txarg);
extern int	zil_claim(struct dsl_pool *dp,
    struct dsl_dataset *ds, void *txarg);
extern int 	zil_check_log_chain(struct dsl_pool *dp,
    struct dsl_dataset *ds, void *tx);
extern void	zil_sync(zilog_t *zilog, dmu_tx_t *tx);
extern void	zil_clean(zilog_t *zilog, uint64_t synced_txg);

extern int	zil_suspend(const char *osname, void **cookiep);
extern void	zil_resume(void *cookie);

extern void	zil_lwb_add_block(struct lwb *lwb, const blkptr_t *bp);
extern void	zil_lwb_add_txg(struct lwb *lwb, uint64_t txg);
extern int	zil_bp_tree_add(zilog_t *zilog, const blkptr_t *bp);

extern void	zil_set_sync(zilog_t *zilog, uint64_t syncval);

extern void	zil_set_logbias(zilog_t *zilog, uint64_t slogval);

extern uint64_t	zil_max_copied_data(zilog_t *zilog);
extern uint64_t	zil_max_log_data(zilog_t *zilog);

extern int zil_replay_disable;

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_ZIL_H */