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34dc7c2f BB |
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 | /* | |
428870ff | 22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
29809a6c | 23 | * Copyright (c) 2012 by Delphix. All rights reserved. |
34dc7c2f BB |
24 | */ |
25 | ||
428870ff BB |
26 | /* Portions Copyright 2010 Robert Milkowski */ |
27 | ||
34dc7c2f BB |
28 | #include <sys/zfs_context.h> |
29 | #include <sys/spa.h> | |
30 | #include <sys/dmu.h> | |
31 | #include <sys/zap.h> | |
32 | #include <sys/arc.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/resource.h> | |
35 | #include <sys/zil.h> | |
36 | #include <sys/zil_impl.h> | |
37 | #include <sys/dsl_dataset.h> | |
572e2857 | 38 | #include <sys/vdev_impl.h> |
34dc7c2f | 39 | #include <sys/dmu_tx.h> |
428870ff | 40 | #include <sys/dsl_pool.h> |
920dd524 | 41 | #include <sys/metaslab.h> |
34dc7c2f BB |
42 | |
43 | /* | |
44 | * The zfs intent log (ZIL) saves transaction records of system calls | |
45 | * that change the file system in memory with enough information | |
46 | * to be able to replay them. These are stored in memory until | |
47 | * either the DMU transaction group (txg) commits them to the stable pool | |
48 | * and they can be discarded, or they are flushed to the stable log | |
49 | * (also in the pool) due to a fsync, O_DSYNC or other synchronous | |
50 | * requirement. In the event of a panic or power fail then those log | |
51 | * records (transactions) are replayed. | |
52 | * | |
53 | * There is one ZIL per file system. Its on-disk (pool) format consists | |
54 | * of 3 parts: | |
55 | * | |
56 | * - ZIL header | |
57 | * - ZIL blocks | |
58 | * - ZIL records | |
59 | * | |
60 | * A log record holds a system call transaction. Log blocks can | |
61 | * hold many log records and the blocks are chained together. | |
62 | * Each ZIL block contains a block pointer (blkptr_t) to the next | |
63 | * ZIL block in the chain. The ZIL header points to the first | |
64 | * block in the chain. Note there is not a fixed place in the pool | |
65 | * to hold blocks. They are dynamically allocated and freed as | |
66 | * needed from the blocks available. Figure X shows the ZIL structure: | |
67 | */ | |
68 | ||
b6ad9671 ED |
69 | /* |
70 | * See zil.h for more information about these fields. | |
71 | */ | |
72 | zil_stats_t zil_stats = { | |
73 | { "zil_commit_count", KSTAT_DATA_UINT64 }, | |
74 | { "zil_commit_writer_count", KSTAT_DATA_UINT64 }, | |
75 | { "zil_itx_count", KSTAT_DATA_UINT64 }, | |
76 | { "zil_itx_indirect_count", KSTAT_DATA_UINT64 }, | |
77 | { "zil_itx_indirect_bytes", KSTAT_DATA_UINT64 }, | |
78 | { "zil_itx_copied_count", KSTAT_DATA_UINT64 }, | |
79 | { "zil_itx_copied_bytes", KSTAT_DATA_UINT64 }, | |
80 | { "zil_itx_needcopy_count", KSTAT_DATA_UINT64 }, | |
81 | { "zil_itx_needcopy_bytes", KSTAT_DATA_UINT64 }, | |
82 | { "zil_itx_metaslab_normal_count", KSTAT_DATA_UINT64 }, | |
83 | { "zil_itx_metaslab_normal_bytes", KSTAT_DATA_UINT64 }, | |
84 | { "zil_itx_metaslab_slog_count", KSTAT_DATA_UINT64 }, | |
85 | { "zil_itx_metaslab_slog_bytes", KSTAT_DATA_UINT64 }, | |
86 | }; | |
87 | ||
88 | static kstat_t *zil_ksp; | |
89 | ||
34dc7c2f BB |
90 | /* |
91 | * This global ZIL switch affects all pools | |
92 | */ | |
428870ff | 93 | int zil_replay_disable = 0; /* disable intent logging replay */ |
34dc7c2f BB |
94 | |
95 | /* | |
96 | * Tunable parameter for debugging or performance analysis. Setting | |
97 | * zfs_nocacheflush will cause corruption on power loss if a volatile | |
98 | * out-of-order write cache is enabled. | |
99 | */ | |
c409e464 | 100 | int zfs_nocacheflush = 0; |
34dc7c2f BB |
101 | |
102 | static kmem_cache_t *zil_lwb_cache; | |
103 | ||
572e2857 | 104 | static void zil_async_to_sync(zilog_t *zilog, uint64_t foid); |
428870ff BB |
105 | |
106 | #define LWB_EMPTY(lwb) ((BP_GET_LSIZE(&lwb->lwb_blk) - \ | |
107 | sizeof (zil_chain_t)) == (lwb->lwb_sz - lwb->lwb_nused)) | |
108 | ||
109 | ||
572e2857 BB |
110 | /* |
111 | * ziltest is by and large an ugly hack, but very useful in | |
112 | * checking replay without tedious work. | |
113 | * When running ziltest we want to keep all itx's and so maintain | |
114 | * a single list in the zl_itxg[] that uses a high txg: ZILTEST_TXG | |
115 | * We subtract TXG_CONCURRENT_STATES to allow for common code. | |
116 | */ | |
117 | #define ZILTEST_TXG (UINT64_MAX - TXG_CONCURRENT_STATES) | |
118 | ||
34dc7c2f | 119 | static int |
428870ff | 120 | zil_bp_compare(const void *x1, const void *x2) |
34dc7c2f | 121 | { |
428870ff BB |
122 | const dva_t *dva1 = &((zil_bp_node_t *)x1)->zn_dva; |
123 | const dva_t *dva2 = &((zil_bp_node_t *)x2)->zn_dva; | |
34dc7c2f BB |
124 | |
125 | if (DVA_GET_VDEV(dva1) < DVA_GET_VDEV(dva2)) | |
126 | return (-1); | |
127 | if (DVA_GET_VDEV(dva1) > DVA_GET_VDEV(dva2)) | |
128 | return (1); | |
129 | ||
130 | if (DVA_GET_OFFSET(dva1) < DVA_GET_OFFSET(dva2)) | |
131 | return (-1); | |
132 | if (DVA_GET_OFFSET(dva1) > DVA_GET_OFFSET(dva2)) | |
133 | return (1); | |
134 | ||
135 | return (0); | |
136 | } | |
137 | ||
138 | static void | |
428870ff | 139 | zil_bp_tree_init(zilog_t *zilog) |
34dc7c2f | 140 | { |
428870ff BB |
141 | avl_create(&zilog->zl_bp_tree, zil_bp_compare, |
142 | sizeof (zil_bp_node_t), offsetof(zil_bp_node_t, zn_node)); | |
34dc7c2f BB |
143 | } |
144 | ||
145 | static void | |
428870ff | 146 | zil_bp_tree_fini(zilog_t *zilog) |
34dc7c2f | 147 | { |
428870ff BB |
148 | avl_tree_t *t = &zilog->zl_bp_tree; |
149 | zil_bp_node_t *zn; | |
34dc7c2f BB |
150 | void *cookie = NULL; |
151 | ||
152 | while ((zn = avl_destroy_nodes(t, &cookie)) != NULL) | |
428870ff | 153 | kmem_free(zn, sizeof (zil_bp_node_t)); |
34dc7c2f BB |
154 | |
155 | avl_destroy(t); | |
156 | } | |
157 | ||
428870ff BB |
158 | int |
159 | zil_bp_tree_add(zilog_t *zilog, const blkptr_t *bp) | |
34dc7c2f | 160 | { |
428870ff BB |
161 | avl_tree_t *t = &zilog->zl_bp_tree; |
162 | const dva_t *dva = BP_IDENTITY(bp); | |
163 | zil_bp_node_t *zn; | |
34dc7c2f BB |
164 | avl_index_t where; |
165 | ||
166 | if (avl_find(t, dva, &where) != NULL) | |
167 | return (EEXIST); | |
168 | ||
b8d06fca | 169 | zn = kmem_alloc(sizeof (zil_bp_node_t), KM_PUSHPAGE); |
34dc7c2f BB |
170 | zn->zn_dva = *dva; |
171 | avl_insert(t, zn, where); | |
172 | ||
173 | return (0); | |
174 | } | |
175 | ||
176 | static zil_header_t * | |
177 | zil_header_in_syncing_context(zilog_t *zilog) | |
178 | { | |
179 | return ((zil_header_t *)zilog->zl_header); | |
180 | } | |
181 | ||
182 | static void | |
183 | zil_init_log_chain(zilog_t *zilog, blkptr_t *bp) | |
184 | { | |
185 | zio_cksum_t *zc = &bp->blk_cksum; | |
186 | ||
187 | zc->zc_word[ZIL_ZC_GUID_0] = spa_get_random(-1ULL); | |
188 | zc->zc_word[ZIL_ZC_GUID_1] = spa_get_random(-1ULL); | |
189 | zc->zc_word[ZIL_ZC_OBJSET] = dmu_objset_id(zilog->zl_os); | |
190 | zc->zc_word[ZIL_ZC_SEQ] = 1ULL; | |
191 | } | |
192 | ||
193 | /* | |
428870ff | 194 | * Read a log block and make sure it's valid. |
34dc7c2f BB |
195 | */ |
196 | static int | |
428870ff BB |
197 | zil_read_log_block(zilog_t *zilog, const blkptr_t *bp, blkptr_t *nbp, void *dst, |
198 | char **end) | |
34dc7c2f | 199 | { |
428870ff | 200 | enum zio_flag zio_flags = ZIO_FLAG_CANFAIL; |
34dc7c2f | 201 | uint32_t aflags = ARC_WAIT; |
428870ff BB |
202 | arc_buf_t *abuf = NULL; |
203 | zbookmark_t zb; | |
34dc7c2f BB |
204 | int error; |
205 | ||
428870ff BB |
206 | if (zilog->zl_header->zh_claim_txg == 0) |
207 | zio_flags |= ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB; | |
34dc7c2f | 208 | |
428870ff BB |
209 | if (!(zilog->zl_header->zh_flags & ZIL_CLAIM_LR_SEQ_VALID)) |
210 | zio_flags |= ZIO_FLAG_SPECULATIVE; | |
34dc7c2f | 211 | |
428870ff BB |
212 | SET_BOOKMARK(&zb, bp->blk_cksum.zc_word[ZIL_ZC_OBJSET], |
213 | ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); | |
214 | ||
294f6806 | 215 | error = arc_read(NULL, zilog->zl_spa, bp, arc_getbuf_func, &abuf, |
428870ff | 216 | ZIO_PRIORITY_SYNC_READ, zio_flags, &aflags, &zb); |
34dc7c2f BB |
217 | |
218 | if (error == 0) { | |
34dc7c2f BB |
219 | zio_cksum_t cksum = bp->blk_cksum; |
220 | ||
221 | /* | |
b128c09f BB |
222 | * Validate the checksummed log block. |
223 | * | |
34dc7c2f BB |
224 | * Sequence numbers should be... sequential. The checksum |
225 | * verifier for the next block should be bp's checksum plus 1. | |
b128c09f BB |
226 | * |
227 | * Also check the log chain linkage and size used. | |
34dc7c2f BB |
228 | */ |
229 | cksum.zc_word[ZIL_ZC_SEQ]++; | |
230 | ||
428870ff BB |
231 | if (BP_GET_CHECKSUM(bp) == ZIO_CHECKSUM_ZILOG2) { |
232 | zil_chain_t *zilc = abuf->b_data; | |
233 | char *lr = (char *)(zilc + 1); | |
234 | uint64_t len = zilc->zc_nused - sizeof (zil_chain_t); | |
34dc7c2f | 235 | |
428870ff BB |
236 | if (bcmp(&cksum, &zilc->zc_next_blk.blk_cksum, |
237 | sizeof (cksum)) || BP_IS_HOLE(&zilc->zc_next_blk)) { | |
238 | error = ECKSUM; | |
239 | } else { | |
240 | bcopy(lr, dst, len); | |
241 | *end = (char *)dst + len; | |
242 | *nbp = zilc->zc_next_blk; | |
243 | } | |
244 | } else { | |
245 | char *lr = abuf->b_data; | |
246 | uint64_t size = BP_GET_LSIZE(bp); | |
247 | zil_chain_t *zilc = (zil_chain_t *)(lr + size) - 1; | |
248 | ||
249 | if (bcmp(&cksum, &zilc->zc_next_blk.blk_cksum, | |
250 | sizeof (cksum)) || BP_IS_HOLE(&zilc->zc_next_blk) || | |
251 | (zilc->zc_nused > (size - sizeof (*zilc)))) { | |
252 | error = ECKSUM; | |
253 | } else { | |
254 | bcopy(lr, dst, zilc->zc_nused); | |
255 | *end = (char *)dst + zilc->zc_nused; | |
256 | *nbp = zilc->zc_next_blk; | |
257 | } | |
34dc7c2f | 258 | } |
428870ff BB |
259 | |
260 | VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); | |
261 | } | |
262 | ||
263 | return (error); | |
264 | } | |
265 | ||
266 | /* | |
267 | * Read a TX_WRITE log data block. | |
268 | */ | |
269 | static int | |
270 | zil_read_log_data(zilog_t *zilog, const lr_write_t *lr, void *wbuf) | |
271 | { | |
272 | enum zio_flag zio_flags = ZIO_FLAG_CANFAIL; | |
273 | const blkptr_t *bp = &lr->lr_blkptr; | |
274 | uint32_t aflags = ARC_WAIT; | |
275 | arc_buf_t *abuf = NULL; | |
276 | zbookmark_t zb; | |
277 | int error; | |
278 | ||
279 | if (BP_IS_HOLE(bp)) { | |
280 | if (wbuf != NULL) | |
281 | bzero(wbuf, MAX(BP_GET_LSIZE(bp), lr->lr_length)); | |
282 | return (0); | |
34dc7c2f BB |
283 | } |
284 | ||
428870ff BB |
285 | if (zilog->zl_header->zh_claim_txg == 0) |
286 | zio_flags |= ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB; | |
287 | ||
288 | SET_BOOKMARK(&zb, dmu_objset_id(zilog->zl_os), lr->lr_foid, | |
289 | ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); | |
290 | ||
294f6806 | 291 | error = arc_read(NULL, zilog->zl_spa, bp, arc_getbuf_func, &abuf, |
428870ff BB |
292 | ZIO_PRIORITY_SYNC_READ, zio_flags, &aflags, &zb); |
293 | ||
294 | if (error == 0) { | |
295 | if (wbuf != NULL) | |
296 | bcopy(abuf->b_data, wbuf, arc_buf_size(abuf)); | |
297 | (void) arc_buf_remove_ref(abuf, &abuf); | |
298 | } | |
34dc7c2f BB |
299 | |
300 | return (error); | |
301 | } | |
302 | ||
303 | /* | |
304 | * Parse the intent log, and call parse_func for each valid record within. | |
34dc7c2f | 305 | */ |
428870ff | 306 | int |
34dc7c2f BB |
307 | zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func, |
308 | zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg) | |
309 | { | |
310 | const zil_header_t *zh = zilog->zl_header; | |
428870ff BB |
311 | boolean_t claimed = !!zh->zh_claim_txg; |
312 | uint64_t claim_blk_seq = claimed ? zh->zh_claim_blk_seq : UINT64_MAX; | |
313 | uint64_t claim_lr_seq = claimed ? zh->zh_claim_lr_seq : UINT64_MAX; | |
314 | uint64_t max_blk_seq = 0; | |
315 | uint64_t max_lr_seq = 0; | |
316 | uint64_t blk_count = 0; | |
317 | uint64_t lr_count = 0; | |
318 | blkptr_t blk, next_blk; | |
34dc7c2f | 319 | char *lrbuf, *lrp; |
428870ff | 320 | int error = 0; |
34dc7c2f | 321 | |
d4ed6673 BB |
322 | bzero(&next_blk, sizeof(blkptr_t)); |
323 | ||
428870ff BB |
324 | /* |
325 | * Old logs didn't record the maximum zh_claim_lr_seq. | |
326 | */ | |
327 | if (!(zh->zh_flags & ZIL_CLAIM_LR_SEQ_VALID)) | |
328 | claim_lr_seq = UINT64_MAX; | |
34dc7c2f BB |
329 | |
330 | /* | |
331 | * Starting at the block pointed to by zh_log we read the log chain. | |
332 | * For each block in the chain we strongly check that block to | |
333 | * ensure its validity. We stop when an invalid block is found. | |
334 | * For each block pointer in the chain we call parse_blk_func(). | |
335 | * For each record in each valid block we call parse_lr_func(). | |
336 | * If the log has been claimed, stop if we encounter a sequence | |
337 | * number greater than the highest claimed sequence number. | |
338 | */ | |
428870ff BB |
339 | lrbuf = zio_buf_alloc(SPA_MAXBLOCKSIZE); |
340 | zil_bp_tree_init(zilog); | |
34dc7c2f | 341 | |
428870ff BB |
342 | for (blk = zh->zh_log; !BP_IS_HOLE(&blk); blk = next_blk) { |
343 | uint64_t blk_seq = blk.blk_cksum.zc_word[ZIL_ZC_SEQ]; | |
344 | int reclen; | |
d4ed6673 | 345 | char *end = NULL; |
34dc7c2f | 346 | |
428870ff BB |
347 | if (blk_seq > claim_blk_seq) |
348 | break; | |
349 | if ((error = parse_blk_func(zilog, &blk, arg, txg)) != 0) | |
350 | break; | |
351 | ASSERT3U(max_blk_seq, <, blk_seq); | |
352 | max_blk_seq = blk_seq; | |
353 | blk_count++; | |
34dc7c2f | 354 | |
428870ff BB |
355 | if (max_lr_seq == claim_lr_seq && max_blk_seq == claim_blk_seq) |
356 | break; | |
34dc7c2f | 357 | |
428870ff | 358 | error = zil_read_log_block(zilog, &blk, &next_blk, lrbuf, &end); |
34dc7c2f BB |
359 | if (error) |
360 | break; | |
361 | ||
428870ff | 362 | for (lrp = lrbuf; lrp < end; lrp += reclen) { |
34dc7c2f BB |
363 | lr_t *lr = (lr_t *)lrp; |
364 | reclen = lr->lrc_reclen; | |
365 | ASSERT3U(reclen, >=, sizeof (lr_t)); | |
428870ff BB |
366 | if (lr->lrc_seq > claim_lr_seq) |
367 | goto done; | |
368 | if ((error = parse_lr_func(zilog, lr, arg, txg)) != 0) | |
369 | goto done; | |
370 | ASSERT3U(max_lr_seq, <, lr->lrc_seq); | |
371 | max_lr_seq = lr->lrc_seq; | |
372 | lr_count++; | |
34dc7c2f | 373 | } |
34dc7c2f | 374 | } |
428870ff BB |
375 | done: |
376 | zilog->zl_parse_error = error; | |
377 | zilog->zl_parse_blk_seq = max_blk_seq; | |
378 | zilog->zl_parse_lr_seq = max_lr_seq; | |
379 | zilog->zl_parse_blk_count = blk_count; | |
380 | zilog->zl_parse_lr_count = lr_count; | |
381 | ||
382 | ASSERT(!claimed || !(zh->zh_flags & ZIL_CLAIM_LR_SEQ_VALID) || | |
383 | (max_blk_seq == claim_blk_seq && max_lr_seq == claim_lr_seq)); | |
384 | ||
385 | zil_bp_tree_fini(zilog); | |
386 | zio_buf_free(lrbuf, SPA_MAXBLOCKSIZE); | |
34dc7c2f | 387 | |
428870ff | 388 | return (error); |
34dc7c2f BB |
389 | } |
390 | ||
428870ff | 391 | static int |
34dc7c2f BB |
392 | zil_claim_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t first_txg) |
393 | { | |
34dc7c2f BB |
394 | /* |
395 | * Claim log block if not already committed and not already claimed. | |
428870ff | 396 | * If tx == NULL, just verify that the block is claimable. |
34dc7c2f | 397 | */ |
428870ff BB |
398 | if (bp->blk_birth < first_txg || zil_bp_tree_add(zilog, bp) != 0) |
399 | return (0); | |
400 | ||
401 | return (zio_wait(zio_claim(NULL, zilog->zl_spa, | |
402 | tx == NULL ? 0 : first_txg, bp, spa_claim_notify, NULL, | |
403 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | ZIO_FLAG_SCRUB))); | |
34dc7c2f BB |
404 | } |
405 | ||
428870ff | 406 | static int |
34dc7c2f BB |
407 | zil_claim_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t first_txg) |
408 | { | |
428870ff BB |
409 | lr_write_t *lr = (lr_write_t *)lrc; |
410 | int error; | |
411 | ||
412 | if (lrc->lrc_txtype != TX_WRITE) | |
413 | return (0); | |
414 | ||
415 | /* | |
416 | * If the block is not readable, don't claim it. This can happen | |
417 | * in normal operation when a log block is written to disk before | |
418 | * some of the dmu_sync() blocks it points to. In this case, the | |
419 | * transaction cannot have been committed to anyone (we would have | |
420 | * waited for all writes to be stable first), so it is semantically | |
421 | * correct to declare this the end of the log. | |
422 | */ | |
423 | if (lr->lr_blkptr.blk_birth >= first_txg && | |
424 | (error = zil_read_log_data(zilog, lr, NULL)) != 0) | |
425 | return (error); | |
426 | return (zil_claim_log_block(zilog, &lr->lr_blkptr, tx, first_txg)); | |
34dc7c2f BB |
427 | } |
428 | ||
429 | /* ARGSUSED */ | |
428870ff | 430 | static int |
34dc7c2f BB |
431 | zil_free_log_block(zilog_t *zilog, blkptr_t *bp, void *tx, uint64_t claim_txg) |
432 | { | |
428870ff BB |
433 | zio_free_zil(zilog->zl_spa, dmu_tx_get_txg(tx), bp); |
434 | ||
435 | return (0); | |
34dc7c2f BB |
436 | } |
437 | ||
428870ff | 438 | static int |
34dc7c2f BB |
439 | zil_free_log_record(zilog_t *zilog, lr_t *lrc, void *tx, uint64_t claim_txg) |
440 | { | |
428870ff BB |
441 | lr_write_t *lr = (lr_write_t *)lrc; |
442 | blkptr_t *bp = &lr->lr_blkptr; | |
443 | ||
34dc7c2f BB |
444 | /* |
445 | * If we previously claimed it, we need to free it. | |
446 | */ | |
428870ff BB |
447 | if (claim_txg != 0 && lrc->lrc_txtype == TX_WRITE && |
448 | bp->blk_birth >= claim_txg && zil_bp_tree_add(zilog, bp) == 0) | |
449 | zio_free(zilog->zl_spa, dmu_tx_get_txg(tx), bp); | |
450 | ||
451 | return (0); | |
452 | } | |
453 | ||
454 | static lwb_t * | |
920dd524 | 455 | zil_alloc_lwb(zilog_t *zilog, blkptr_t *bp, uint64_t txg, boolean_t fastwrite) |
428870ff BB |
456 | { |
457 | lwb_t *lwb; | |
458 | ||
b8d06fca | 459 | lwb = kmem_cache_alloc(zil_lwb_cache, KM_PUSHPAGE); |
428870ff BB |
460 | lwb->lwb_zilog = zilog; |
461 | lwb->lwb_blk = *bp; | |
920dd524 | 462 | lwb->lwb_fastwrite = fastwrite; |
428870ff BB |
463 | lwb->lwb_buf = zio_buf_alloc(BP_GET_LSIZE(bp)); |
464 | lwb->lwb_max_txg = txg; | |
465 | lwb->lwb_zio = NULL; | |
466 | lwb->lwb_tx = NULL; | |
467 | if (BP_GET_CHECKSUM(bp) == ZIO_CHECKSUM_ZILOG2) { | |
468 | lwb->lwb_nused = sizeof (zil_chain_t); | |
469 | lwb->lwb_sz = BP_GET_LSIZE(bp); | |
470 | } else { | |
471 | lwb->lwb_nused = 0; | |
472 | lwb->lwb_sz = BP_GET_LSIZE(bp) - sizeof (zil_chain_t); | |
34dc7c2f | 473 | } |
428870ff BB |
474 | |
475 | mutex_enter(&zilog->zl_lock); | |
476 | list_insert_tail(&zilog->zl_lwb_list, lwb); | |
477 | mutex_exit(&zilog->zl_lock); | |
478 | ||
479 | return (lwb); | |
34dc7c2f BB |
480 | } |
481 | ||
29809a6c MA |
482 | /* |
483 | * Called when we create in-memory log transactions so that we know | |
484 | * to cleanup the itxs at the end of spa_sync(). | |
485 | */ | |
486 | void | |
487 | zilog_dirty(zilog_t *zilog, uint64_t txg) | |
488 | { | |
489 | dsl_pool_t *dp = zilog->zl_dmu_pool; | |
490 | dsl_dataset_t *ds = dmu_objset_ds(zilog->zl_os); | |
491 | ||
492 | if (dsl_dataset_is_snapshot(ds)) | |
493 | panic("dirtying snapshot!"); | |
494 | ||
495 | if (txg_list_add(&dp->dp_dirty_zilogs, zilog, txg) == 0) { | |
496 | /* up the hold count until we can be written out */ | |
497 | dmu_buf_add_ref(ds->ds_dbuf, zilog); | |
498 | } | |
499 | } | |
500 | ||
501 | boolean_t | |
502 | zilog_is_dirty(zilog_t *zilog) | |
503 | { | |
504 | dsl_pool_t *dp = zilog->zl_dmu_pool; | |
505 | int t; | |
506 | ||
507 | for (t = 0; t < TXG_SIZE; t++) { | |
508 | if (txg_list_member(&dp->dp_dirty_zilogs, zilog, t)) | |
509 | return (B_TRUE); | |
510 | } | |
511 | return (B_FALSE); | |
512 | } | |
513 | ||
34dc7c2f BB |
514 | /* |
515 | * Create an on-disk intent log. | |
516 | */ | |
428870ff | 517 | static lwb_t * |
34dc7c2f BB |
518 | zil_create(zilog_t *zilog) |
519 | { | |
520 | const zil_header_t *zh = zilog->zl_header; | |
428870ff | 521 | lwb_t *lwb = NULL; |
34dc7c2f BB |
522 | uint64_t txg = 0; |
523 | dmu_tx_t *tx = NULL; | |
524 | blkptr_t blk; | |
525 | int error = 0; | |
920dd524 | 526 | boolean_t fastwrite = FALSE; |
34dc7c2f BB |
527 | |
528 | /* | |
529 | * Wait for any previous destroy to complete. | |
530 | */ | |
531 | txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); | |
532 | ||
533 | ASSERT(zh->zh_claim_txg == 0); | |
534 | ASSERT(zh->zh_replay_seq == 0); | |
535 | ||
536 | blk = zh->zh_log; | |
537 | ||
538 | /* | |
428870ff BB |
539 | * Allocate an initial log block if: |
540 | * - there isn't one already | |
541 | * - the existing block is the wrong endianess | |
34dc7c2f | 542 | */ |
fb5f0bc8 | 543 | if (BP_IS_HOLE(&blk) || BP_SHOULD_BYTESWAP(&blk)) { |
34dc7c2f | 544 | tx = dmu_tx_create(zilog->zl_os); |
428870ff | 545 | VERIFY(dmu_tx_assign(tx, TXG_WAIT) == 0); |
34dc7c2f BB |
546 | dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); |
547 | txg = dmu_tx_get_txg(tx); | |
548 | ||
fb5f0bc8 | 549 | if (!BP_IS_HOLE(&blk)) { |
428870ff | 550 | zio_free_zil(zilog->zl_spa, txg, &blk); |
fb5f0bc8 BB |
551 | BP_ZERO(&blk); |
552 | } | |
553 | ||
920dd524 | 554 | error = zio_alloc_zil(zilog->zl_spa, txg, &blk, |
5d7a86d1 | 555 | ZIL_MIN_BLKSZ, B_TRUE); |
920dd524 | 556 | fastwrite = TRUE; |
34dc7c2f BB |
557 | |
558 | if (error == 0) | |
559 | zil_init_log_chain(zilog, &blk); | |
560 | } | |
561 | ||
562 | /* | |
563 | * Allocate a log write buffer (lwb) for the first log block. | |
564 | */ | |
428870ff | 565 | if (error == 0) |
920dd524 | 566 | lwb = zil_alloc_lwb(zilog, &blk, txg, fastwrite); |
34dc7c2f BB |
567 | |
568 | /* | |
569 | * If we just allocated the first log block, commit our transaction | |
570 | * and wait for zil_sync() to stuff the block poiner into zh_log. | |
571 | * (zh is part of the MOS, so we cannot modify it in open context.) | |
572 | */ | |
573 | if (tx != NULL) { | |
574 | dmu_tx_commit(tx); | |
575 | txg_wait_synced(zilog->zl_dmu_pool, txg); | |
576 | } | |
577 | ||
578 | ASSERT(bcmp(&blk, &zh->zh_log, sizeof (blk)) == 0); | |
428870ff BB |
579 | |
580 | return (lwb); | |
34dc7c2f BB |
581 | } |
582 | ||
583 | /* | |
584 | * In one tx, free all log blocks and clear the log header. | |
585 | * If keep_first is set, then we're replaying a log with no content. | |
586 | * We want to keep the first block, however, so that the first | |
587 | * synchronous transaction doesn't require a txg_wait_synced() | |
588 | * in zil_create(). We don't need to txg_wait_synced() here either | |
589 | * when keep_first is set, because both zil_create() and zil_destroy() | |
590 | * will wait for any in-progress destroys to complete. | |
591 | */ | |
592 | void | |
593 | zil_destroy(zilog_t *zilog, boolean_t keep_first) | |
594 | { | |
595 | const zil_header_t *zh = zilog->zl_header; | |
596 | lwb_t *lwb; | |
597 | dmu_tx_t *tx; | |
598 | uint64_t txg; | |
599 | ||
600 | /* | |
601 | * Wait for any previous destroy to complete. | |
602 | */ | |
603 | txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); | |
604 | ||
428870ff BB |
605 | zilog->zl_old_header = *zh; /* debugging aid */ |
606 | ||
34dc7c2f BB |
607 | if (BP_IS_HOLE(&zh->zh_log)) |
608 | return; | |
609 | ||
610 | tx = dmu_tx_create(zilog->zl_os); | |
428870ff | 611 | VERIFY(dmu_tx_assign(tx, TXG_WAIT) == 0); |
34dc7c2f BB |
612 | dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); |
613 | txg = dmu_tx_get_txg(tx); | |
614 | ||
615 | mutex_enter(&zilog->zl_lock); | |
616 | ||
34dc7c2f BB |
617 | ASSERT3U(zilog->zl_destroy_txg, <, txg); |
618 | zilog->zl_destroy_txg = txg; | |
619 | zilog->zl_keep_first = keep_first; | |
620 | ||
621 | if (!list_is_empty(&zilog->zl_lwb_list)) { | |
622 | ASSERT(zh->zh_claim_txg == 0); | |
3e31d2b0 | 623 | VERIFY(!keep_first); |
34dc7c2f | 624 | while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) { |
920dd524 ED |
625 | ASSERT(lwb->lwb_zio == NULL); |
626 | if (lwb->lwb_fastwrite) | |
627 | metaslab_fastwrite_unmark(zilog->zl_spa, | |
628 | &lwb->lwb_blk); | |
34dc7c2f BB |
629 | list_remove(&zilog->zl_lwb_list, lwb); |
630 | if (lwb->lwb_buf != NULL) | |
631 | zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); | |
428870ff | 632 | zio_free_zil(zilog->zl_spa, txg, &lwb->lwb_blk); |
34dc7c2f BB |
633 | kmem_cache_free(zil_lwb_cache, lwb); |
634 | } | |
428870ff | 635 | } else if (!keep_first) { |
29809a6c | 636 | zil_destroy_sync(zilog, tx); |
34dc7c2f BB |
637 | } |
638 | mutex_exit(&zilog->zl_lock); | |
639 | ||
640 | dmu_tx_commit(tx); | |
641 | } | |
642 | ||
29809a6c MA |
643 | void |
644 | zil_destroy_sync(zilog_t *zilog, dmu_tx_t *tx) | |
645 | { | |
646 | ASSERT(list_is_empty(&zilog->zl_lwb_list)); | |
647 | (void) zil_parse(zilog, zil_free_log_block, | |
648 | zil_free_log_record, tx, zilog->zl_header->zh_claim_txg); | |
649 | } | |
650 | ||
34dc7c2f | 651 | int |
428870ff | 652 | zil_claim(const char *osname, void *txarg) |
34dc7c2f BB |
653 | { |
654 | dmu_tx_t *tx = txarg; | |
655 | uint64_t first_txg = dmu_tx_get_txg(tx); | |
656 | zilog_t *zilog; | |
657 | zil_header_t *zh; | |
658 | objset_t *os; | |
659 | int error; | |
660 | ||
428870ff | 661 | error = dmu_objset_hold(osname, FTAG, &os); |
34dc7c2f | 662 | if (error) { |
b128c09f | 663 | cmn_err(CE_WARN, "can't open objset for %s", osname); |
34dc7c2f BB |
664 | return (0); |
665 | } | |
666 | ||
667 | zilog = dmu_objset_zil(os); | |
668 | zh = zil_header_in_syncing_context(zilog); | |
669 | ||
428870ff | 670 | if (spa_get_log_state(zilog->zl_spa) == SPA_LOG_CLEAR) { |
9babb374 | 671 | if (!BP_IS_HOLE(&zh->zh_log)) |
428870ff | 672 | zio_free_zil(zilog->zl_spa, first_txg, &zh->zh_log); |
9babb374 BB |
673 | BP_ZERO(&zh->zh_log); |
674 | dsl_dataset_dirty(dmu_objset_ds(os), tx); | |
428870ff BB |
675 | dmu_objset_rele(os, FTAG); |
676 | return (0); | |
9babb374 BB |
677 | } |
678 | ||
34dc7c2f BB |
679 | /* |
680 | * Claim all log blocks if we haven't already done so, and remember | |
681 | * the highest claimed sequence number. This ensures that if we can | |
682 | * read only part of the log now (e.g. due to a missing device), | |
683 | * but we can read the entire log later, we will not try to replay | |
684 | * or destroy beyond the last block we successfully claimed. | |
685 | */ | |
686 | ASSERT3U(zh->zh_claim_txg, <=, first_txg); | |
687 | if (zh->zh_claim_txg == 0 && !BP_IS_HOLE(&zh->zh_log)) { | |
428870ff | 688 | (void) zil_parse(zilog, zil_claim_log_block, |
34dc7c2f | 689 | zil_claim_log_record, tx, first_txg); |
428870ff BB |
690 | zh->zh_claim_txg = first_txg; |
691 | zh->zh_claim_blk_seq = zilog->zl_parse_blk_seq; | |
692 | zh->zh_claim_lr_seq = zilog->zl_parse_lr_seq; | |
693 | if (zilog->zl_parse_lr_count || zilog->zl_parse_blk_count > 1) | |
694 | zh->zh_flags |= ZIL_REPLAY_NEEDED; | |
695 | zh->zh_flags |= ZIL_CLAIM_LR_SEQ_VALID; | |
34dc7c2f BB |
696 | dsl_dataset_dirty(dmu_objset_ds(os), tx); |
697 | } | |
698 | ||
699 | ASSERT3U(first_txg, ==, (spa_last_synced_txg(zilog->zl_spa) + 1)); | |
428870ff | 700 | dmu_objset_rele(os, FTAG); |
34dc7c2f BB |
701 | return (0); |
702 | } | |
703 | ||
b128c09f BB |
704 | /* |
705 | * Check the log by walking the log chain. | |
706 | * Checksum errors are ok as they indicate the end of the chain. | |
707 | * Any other error (no device or read failure) returns an error. | |
708 | */ | |
b128c09f | 709 | int |
428870ff | 710 | zil_check_log_chain(const char *osname, void *tx) |
b128c09f BB |
711 | { |
712 | zilog_t *zilog; | |
b128c09f | 713 | objset_t *os; |
572e2857 | 714 | blkptr_t *bp; |
b128c09f BB |
715 | int error; |
716 | ||
428870ff BB |
717 | ASSERT(tx == NULL); |
718 | ||
719 | error = dmu_objset_hold(osname, FTAG, &os); | |
b128c09f BB |
720 | if (error) { |
721 | cmn_err(CE_WARN, "can't open objset for %s", osname); | |
722 | return (0); | |
723 | } | |
724 | ||
725 | zilog = dmu_objset_zil(os); | |
572e2857 BB |
726 | bp = (blkptr_t *)&zilog->zl_header->zh_log; |
727 | ||
728 | /* | |
729 | * Check the first block and determine if it's on a log device | |
730 | * which may have been removed or faulted prior to loading this | |
731 | * pool. If so, there's no point in checking the rest of the log | |
732 | * as its content should have already been synced to the pool. | |
733 | */ | |
734 | if (!BP_IS_HOLE(bp)) { | |
735 | vdev_t *vd; | |
736 | boolean_t valid = B_TRUE; | |
737 | ||
738 | spa_config_enter(os->os_spa, SCL_STATE, FTAG, RW_READER); | |
739 | vd = vdev_lookup_top(os->os_spa, DVA_GET_VDEV(&bp->blk_dva[0])); | |
740 | if (vd->vdev_islog && vdev_is_dead(vd)) | |
741 | valid = vdev_log_state_valid(vd); | |
742 | spa_config_exit(os->os_spa, SCL_STATE, FTAG); | |
743 | ||
744 | if (!valid) { | |
745 | dmu_objset_rele(os, FTAG); | |
746 | return (0); | |
747 | } | |
748 | } | |
b128c09f | 749 | |
428870ff BB |
750 | /* |
751 | * Because tx == NULL, zil_claim_log_block() will not actually claim | |
752 | * any blocks, but just determine whether it is possible to do so. | |
753 | * In addition to checking the log chain, zil_claim_log_block() | |
754 | * will invoke zio_claim() with a done func of spa_claim_notify(), | |
755 | * which will update spa_max_claim_txg. See spa_load() for details. | |
756 | */ | |
757 | error = zil_parse(zilog, zil_claim_log_block, zil_claim_log_record, tx, | |
758 | zilog->zl_header->zh_claim_txg ? -1ULL : spa_first_txg(os->os_spa)); | |
759 | ||
760 | dmu_objset_rele(os, FTAG); | |
761 | ||
762 | return ((error == ECKSUM || error == ENOENT) ? 0 : error); | |
b128c09f BB |
763 | } |
764 | ||
34dc7c2f BB |
765 | static int |
766 | zil_vdev_compare(const void *x1, const void *x2) | |
767 | { | |
572e2857 BB |
768 | const uint64_t v1 = ((zil_vdev_node_t *)x1)->zv_vdev; |
769 | const uint64_t v2 = ((zil_vdev_node_t *)x2)->zv_vdev; | |
34dc7c2f BB |
770 | |
771 | if (v1 < v2) | |
772 | return (-1); | |
773 | if (v1 > v2) | |
774 | return (1); | |
775 | ||
776 | return (0); | |
777 | } | |
778 | ||
779 | void | |
428870ff | 780 | zil_add_block(zilog_t *zilog, const blkptr_t *bp) |
34dc7c2f BB |
781 | { |
782 | avl_tree_t *t = &zilog->zl_vdev_tree; | |
783 | avl_index_t where; | |
784 | zil_vdev_node_t *zv, zvsearch; | |
785 | int ndvas = BP_GET_NDVAS(bp); | |
786 | int i; | |
787 | ||
788 | if (zfs_nocacheflush) | |
789 | return; | |
790 | ||
791 | ASSERT(zilog->zl_writer); | |
792 | ||
793 | /* | |
794 | * Even though we're zl_writer, we still need a lock because the | |
795 | * zl_get_data() callbacks may have dmu_sync() done callbacks | |
796 | * that will run concurrently. | |
797 | */ | |
798 | mutex_enter(&zilog->zl_vdev_lock); | |
799 | for (i = 0; i < ndvas; i++) { | |
800 | zvsearch.zv_vdev = DVA_GET_VDEV(&bp->blk_dva[i]); | |
801 | if (avl_find(t, &zvsearch, &where) == NULL) { | |
b8d06fca | 802 | zv = kmem_alloc(sizeof (*zv), KM_PUSHPAGE); |
34dc7c2f BB |
803 | zv->zv_vdev = zvsearch.zv_vdev; |
804 | avl_insert(t, zv, where); | |
805 | } | |
806 | } | |
807 | mutex_exit(&zilog->zl_vdev_lock); | |
808 | } | |
809 | ||
572e2857 | 810 | static void |
34dc7c2f BB |
811 | zil_flush_vdevs(zilog_t *zilog) |
812 | { | |
813 | spa_t *spa = zilog->zl_spa; | |
814 | avl_tree_t *t = &zilog->zl_vdev_tree; | |
815 | void *cookie = NULL; | |
816 | zil_vdev_node_t *zv; | |
817 | zio_t *zio; | |
818 | ||
819 | ASSERT(zilog->zl_writer); | |
820 | ||
821 | /* | |
822 | * We don't need zl_vdev_lock here because we're the zl_writer, | |
823 | * and all zl_get_data() callbacks are done. | |
824 | */ | |
825 | if (avl_numnodes(t) == 0) | |
826 | return; | |
827 | ||
b128c09f | 828 | spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); |
34dc7c2f | 829 | |
b128c09f | 830 | zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL); |
34dc7c2f BB |
831 | |
832 | while ((zv = avl_destroy_nodes(t, &cookie)) != NULL) { | |
833 | vdev_t *vd = vdev_lookup_top(spa, zv->zv_vdev); | |
834 | if (vd != NULL) | |
835 | zio_flush(zio, vd); | |
836 | kmem_free(zv, sizeof (*zv)); | |
837 | } | |
838 | ||
839 | /* | |
840 | * Wait for all the flushes to complete. Not all devices actually | |
841 | * support the DKIOCFLUSHWRITECACHE ioctl, so it's OK if it fails. | |
842 | */ | |
843 | (void) zio_wait(zio); | |
844 | ||
b128c09f | 845 | spa_config_exit(spa, SCL_STATE, FTAG); |
34dc7c2f BB |
846 | } |
847 | ||
848 | /* | |
849 | * Function called when a log block write completes | |
850 | */ | |
851 | static void | |
852 | zil_lwb_write_done(zio_t *zio) | |
853 | { | |
854 | lwb_t *lwb = zio->io_private; | |
855 | zilog_t *zilog = lwb->lwb_zilog; | |
428870ff | 856 | dmu_tx_t *tx = lwb->lwb_tx; |
34dc7c2f | 857 | |
b128c09f | 858 | ASSERT(BP_GET_COMPRESS(zio->io_bp) == ZIO_COMPRESS_OFF); |
b128c09f BB |
859 | ASSERT(BP_GET_TYPE(zio->io_bp) == DMU_OT_INTENT_LOG); |
860 | ASSERT(BP_GET_LEVEL(zio->io_bp) == 0); | |
861 | ASSERT(BP_GET_BYTEORDER(zio->io_bp) == ZFS_HOST_BYTEORDER); | |
862 | ASSERT(!BP_IS_GANG(zio->io_bp)); | |
863 | ASSERT(!BP_IS_HOLE(zio->io_bp)); | |
864 | ASSERT(zio->io_bp->blk_fill == 0); | |
865 | ||
34dc7c2f | 866 | /* |
9babb374 BB |
867 | * Ensure the lwb buffer pointer is cleared before releasing |
868 | * the txg. If we have had an allocation failure and | |
869 | * the txg is waiting to sync then we want want zil_sync() | |
870 | * to remove the lwb so that it's not picked up as the next new | |
871 | * one in zil_commit_writer(). zil_sync() will only remove | |
872 | * the lwb if lwb_buf is null. | |
34dc7c2f | 873 | */ |
34dc7c2f BB |
874 | zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); |
875 | mutex_enter(&zilog->zl_lock); | |
920dd524 ED |
876 | lwb->lwb_zio = NULL; |
877 | lwb->lwb_fastwrite = FALSE; | |
34dc7c2f | 878 | lwb->lwb_buf = NULL; |
428870ff BB |
879 | lwb->lwb_tx = NULL; |
880 | mutex_exit(&zilog->zl_lock); | |
9babb374 BB |
881 | |
882 | /* | |
883 | * Now that we've written this log block, we have a stable pointer | |
884 | * to the next block in the chain, so it's OK to let the txg in | |
428870ff | 885 | * which we allocated the next block sync. |
9babb374 | 886 | */ |
428870ff | 887 | dmu_tx_commit(tx); |
34dc7c2f BB |
888 | } |
889 | ||
890 | /* | |
891 | * Initialize the io for a log block. | |
34dc7c2f BB |
892 | */ |
893 | static void | |
894 | zil_lwb_write_init(zilog_t *zilog, lwb_t *lwb) | |
895 | { | |
896 | zbookmark_t zb; | |
897 | ||
428870ff BB |
898 | SET_BOOKMARK(&zb, lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_OBJSET], |
899 | ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, | |
900 | lwb->lwb_blk.blk_cksum.zc_word[ZIL_ZC_SEQ]); | |
34dc7c2f BB |
901 | |
902 | if (zilog->zl_root_zio == NULL) { | |
903 | zilog->zl_root_zio = zio_root(zilog->zl_spa, NULL, NULL, | |
904 | ZIO_FLAG_CANFAIL); | |
905 | } | |
920dd524 ED |
906 | |
907 | /* Lock so zil_sync() doesn't fastwrite_unmark after zio is created */ | |
908 | mutex_enter(&zilog->zl_lock); | |
34dc7c2f | 909 | if (lwb->lwb_zio == NULL) { |
920dd524 ED |
910 | if (!lwb->lwb_fastwrite) { |
911 | metaslab_fastwrite_mark(zilog->zl_spa, &lwb->lwb_blk); | |
912 | lwb->lwb_fastwrite = 1; | |
913 | } | |
34dc7c2f | 914 | lwb->lwb_zio = zio_rewrite(zilog->zl_root_zio, zilog->zl_spa, |
428870ff | 915 | 0, &lwb->lwb_blk, lwb->lwb_buf, BP_GET_LSIZE(&lwb->lwb_blk), |
9babb374 | 916 | zil_lwb_write_done, lwb, ZIO_PRIORITY_LOG_WRITE, |
920dd524 ED |
917 | ZIO_FLAG_CANFAIL | ZIO_FLAG_DONT_PROPAGATE | |
918 | ZIO_FLAG_FASTWRITE, &zb); | |
34dc7c2f | 919 | } |
920dd524 | 920 | mutex_exit(&zilog->zl_lock); |
34dc7c2f BB |
921 | } |
922 | ||
428870ff BB |
923 | /* |
924 | * Define a limited set of intent log block sizes. | |
925 | * These must be a multiple of 4KB. Note only the amount used (again | |
926 | * aligned to 4KB) actually gets written. However, we can't always just | |
927 | * allocate SPA_MAXBLOCKSIZE as the slog space could be exhausted. | |
928 | */ | |
929 | uint64_t zil_block_buckets[] = { | |
930 | 4096, /* non TX_WRITE */ | |
931 | 8192+4096, /* data base */ | |
932 | 32*1024 + 4096, /* NFS writes */ | |
933 | UINT64_MAX | |
934 | }; | |
935 | ||
936 | /* | |
5d7a86d1 ED |
937 | * Use the slog as long as the current commit size is less than the |
938 | * limit or the total list size is less than 2X the limit. Limit | |
939 | * checking is disabled by setting zil_slog_limit to UINT64_MAX. | |
428870ff | 940 | */ |
ee191e80 | 941 | unsigned long zil_slog_limit = 1024 * 1024; |
5d7a86d1 ED |
942 | #define USE_SLOG(zilog) (((zilog)->zl_cur_used < zil_slog_limit) || \ |
943 | ((zilog)->zl_itx_list_sz < (zil_slog_limit << 1))) | |
428870ff | 944 | |
34dc7c2f BB |
945 | /* |
946 | * Start a log block write and advance to the next log block. | |
947 | * Calls are serialized. | |
948 | */ | |
949 | static lwb_t * | |
950 | zil_lwb_write_start(zilog_t *zilog, lwb_t *lwb) | |
951 | { | |
428870ff BB |
952 | lwb_t *nlwb = NULL; |
953 | zil_chain_t *zilc; | |
34dc7c2f | 954 | spa_t *spa = zilog->zl_spa; |
428870ff BB |
955 | blkptr_t *bp; |
956 | dmu_tx_t *tx; | |
34dc7c2f | 957 | uint64_t txg; |
428870ff BB |
958 | uint64_t zil_blksz, wsz; |
959 | int i, error; | |
b6ad9671 | 960 | boolean_t use_slog; |
428870ff BB |
961 | |
962 | if (BP_GET_CHECKSUM(&lwb->lwb_blk) == ZIO_CHECKSUM_ZILOG2) { | |
963 | zilc = (zil_chain_t *)lwb->lwb_buf; | |
964 | bp = &zilc->zc_next_blk; | |
965 | } else { | |
966 | zilc = (zil_chain_t *)(lwb->lwb_buf + lwb->lwb_sz); | |
967 | bp = &zilc->zc_next_blk; | |
968 | } | |
34dc7c2f | 969 | |
428870ff | 970 | ASSERT(lwb->lwb_nused <= lwb->lwb_sz); |
34dc7c2f BB |
971 | |
972 | /* | |
973 | * Allocate the next block and save its address in this block | |
974 | * before writing it in order to establish the log chain. | |
975 | * Note that if the allocation of nlwb synced before we wrote | |
976 | * the block that points at it (lwb), we'd leak it if we crashed. | |
428870ff BB |
977 | * Therefore, we don't do dmu_tx_commit() until zil_lwb_write_done(). |
978 | * We dirty the dataset to ensure that zil_sync() will be called | |
979 | * to clean up in the event of allocation failure or I/O failure. | |
34dc7c2f | 980 | */ |
428870ff BB |
981 | tx = dmu_tx_create(zilog->zl_os); |
982 | VERIFY(dmu_tx_assign(tx, TXG_WAIT) == 0); | |
983 | dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); | |
984 | txg = dmu_tx_get_txg(tx); | |
985 | ||
986 | lwb->lwb_tx = tx; | |
34dc7c2f BB |
987 | |
988 | /* | |
428870ff BB |
989 | * Log blocks are pre-allocated. Here we select the size of the next |
990 | * block, based on size used in the last block. | |
991 | * - first find the smallest bucket that will fit the block from a | |
992 | * limited set of block sizes. This is because it's faster to write | |
993 | * blocks allocated from the same metaslab as they are adjacent or | |
994 | * close. | |
995 | * - next find the maximum from the new suggested size and an array of | |
996 | * previous sizes. This lessens a picket fence effect of wrongly | |
997 | * guesssing the size if we have a stream of say 2k, 64k, 2k, 64k | |
998 | * requests. | |
999 | * | |
1000 | * Note we only write what is used, but we can't just allocate | |
1001 | * the maximum block size because we can exhaust the available | |
1002 | * pool log space. | |
34dc7c2f | 1003 | */ |
428870ff BB |
1004 | zil_blksz = zilog->zl_cur_used + sizeof (zil_chain_t); |
1005 | for (i = 0; zil_blksz > zil_block_buckets[i]; i++) | |
1006 | continue; | |
1007 | zil_blksz = zil_block_buckets[i]; | |
1008 | if (zil_blksz == UINT64_MAX) | |
1009 | zil_blksz = SPA_MAXBLOCKSIZE; | |
1010 | zilog->zl_prev_blks[zilog->zl_prev_rotor] = zil_blksz; | |
1011 | for (i = 0; i < ZIL_PREV_BLKS; i++) | |
1012 | zil_blksz = MAX(zil_blksz, zilog->zl_prev_blks[i]); | |
1013 | zilog->zl_prev_rotor = (zilog->zl_prev_rotor + 1) & (ZIL_PREV_BLKS - 1); | |
34dc7c2f BB |
1014 | |
1015 | BP_ZERO(bp); | |
b6ad9671 | 1016 | use_slog = USE_SLOG(zilog); |
920dd524 | 1017 | error = zio_alloc_zil(spa, txg, bp, zil_blksz, USE_SLOG(zilog)); |
b6ad9671 ED |
1018 | if (use_slog) |
1019 | { | |
1020 | ZIL_STAT_BUMP(zil_itx_metaslab_slog_count); | |
1021 | ZIL_STAT_INCR(zil_itx_metaslab_slog_bytes, lwb->lwb_nused); | |
1022 | } | |
1023 | else | |
1024 | { | |
1025 | ZIL_STAT_BUMP(zil_itx_metaslab_normal_count); | |
1026 | ZIL_STAT_INCR(zil_itx_metaslab_normal_bytes, lwb->lwb_nused); | |
1027 | } | |
428870ff BB |
1028 | if (!error) { |
1029 | ASSERT3U(bp->blk_birth, ==, txg); | |
1030 | bp->blk_cksum = lwb->lwb_blk.blk_cksum; | |
1031 | bp->blk_cksum.zc_word[ZIL_ZC_SEQ]++; | |
34dc7c2f BB |
1032 | |
1033 | /* | |
428870ff | 1034 | * Allocate a new log write buffer (lwb). |
34dc7c2f | 1035 | */ |
920dd524 | 1036 | nlwb = zil_alloc_lwb(zilog, bp, txg, TRUE); |
34dc7c2f | 1037 | |
428870ff BB |
1038 | /* Record the block for later vdev flushing */ |
1039 | zil_add_block(zilog, &lwb->lwb_blk); | |
34dc7c2f BB |
1040 | } |
1041 | ||
428870ff BB |
1042 | if (BP_GET_CHECKSUM(&lwb->lwb_blk) == ZIO_CHECKSUM_ZILOG2) { |
1043 | /* For Slim ZIL only write what is used. */ | |
1044 | wsz = P2ROUNDUP_TYPED(lwb->lwb_nused, ZIL_MIN_BLKSZ, uint64_t); | |
1045 | ASSERT3U(wsz, <=, lwb->lwb_sz); | |
1046 | zio_shrink(lwb->lwb_zio, wsz); | |
34dc7c2f | 1047 | |
428870ff BB |
1048 | } else { |
1049 | wsz = lwb->lwb_sz; | |
1050 | } | |
34dc7c2f | 1051 | |
428870ff BB |
1052 | zilc->zc_pad = 0; |
1053 | zilc->zc_nused = lwb->lwb_nused; | |
1054 | zilc->zc_eck.zec_cksum = lwb->lwb_blk.blk_cksum; | |
34dc7c2f BB |
1055 | |
1056 | /* | |
428870ff | 1057 | * clear unused data for security |
34dc7c2f | 1058 | */ |
428870ff | 1059 | bzero(lwb->lwb_buf + lwb->lwb_nused, wsz - lwb->lwb_nused); |
34dc7c2f | 1060 | |
428870ff | 1061 | zio_nowait(lwb->lwb_zio); /* Kick off the write for the old log block */ |
34dc7c2f BB |
1062 | |
1063 | /* | |
428870ff BB |
1064 | * If there was an allocation failure then nlwb will be null which |
1065 | * forces a txg_wait_synced(). | |
34dc7c2f | 1066 | */ |
34dc7c2f BB |
1067 | return (nlwb); |
1068 | } | |
1069 | ||
1070 | static lwb_t * | |
1071 | zil_lwb_commit(zilog_t *zilog, itx_t *itx, lwb_t *lwb) | |
1072 | { | |
1073 | lr_t *lrc = &itx->itx_lr; /* common log record */ | |
428870ff BB |
1074 | lr_write_t *lrw = (lr_write_t *)lrc; |
1075 | char *lr_buf; | |
34dc7c2f BB |
1076 | uint64_t txg = lrc->lrc_txg; |
1077 | uint64_t reclen = lrc->lrc_reclen; | |
428870ff | 1078 | uint64_t dlen = 0; |
34dc7c2f BB |
1079 | |
1080 | if (lwb == NULL) | |
1081 | return (NULL); | |
428870ff | 1082 | |
34dc7c2f | 1083 | ASSERT(lwb->lwb_buf != NULL); |
29809a6c MA |
1084 | ASSERT(zilog_is_dirty(zilog) || |
1085 | spa_freeze_txg(zilog->zl_spa) != UINT64_MAX); | |
34dc7c2f BB |
1086 | |
1087 | if (lrc->lrc_txtype == TX_WRITE && itx->itx_wr_state == WR_NEED_COPY) | |
1088 | dlen = P2ROUNDUP_TYPED( | |
428870ff | 1089 | lrw->lr_length, sizeof (uint64_t), uint64_t); |
34dc7c2f BB |
1090 | |
1091 | zilog->zl_cur_used += (reclen + dlen); | |
1092 | ||
1093 | zil_lwb_write_init(zilog, lwb); | |
1094 | ||
1095 | /* | |
1096 | * If this record won't fit in the current log block, start a new one. | |
1097 | */ | |
428870ff | 1098 | if (lwb->lwb_nused + reclen + dlen > lwb->lwb_sz) { |
34dc7c2f BB |
1099 | lwb = zil_lwb_write_start(zilog, lwb); |
1100 | if (lwb == NULL) | |
1101 | return (NULL); | |
1102 | zil_lwb_write_init(zilog, lwb); | |
428870ff BB |
1103 | ASSERT(LWB_EMPTY(lwb)); |
1104 | if (lwb->lwb_nused + reclen + dlen > lwb->lwb_sz) { | |
34dc7c2f BB |
1105 | txg_wait_synced(zilog->zl_dmu_pool, txg); |
1106 | return (lwb); | |
1107 | } | |
1108 | } | |
1109 | ||
428870ff BB |
1110 | lr_buf = lwb->lwb_buf + lwb->lwb_nused; |
1111 | bcopy(lrc, lr_buf, reclen); | |
1112 | lrc = (lr_t *)lr_buf; | |
1113 | lrw = (lr_write_t *)lrc; | |
34dc7c2f | 1114 | |
b6ad9671 ED |
1115 | ZIL_STAT_BUMP(zil_itx_count); |
1116 | ||
34dc7c2f BB |
1117 | /* |
1118 | * If it's a write, fetch the data or get its blkptr as appropriate. | |
1119 | */ | |
1120 | if (lrc->lrc_txtype == TX_WRITE) { | |
1121 | if (txg > spa_freeze_txg(zilog->zl_spa)) | |
1122 | txg_wait_synced(zilog->zl_dmu_pool, txg); | |
b6ad9671 ED |
1123 | if (itx->itx_wr_state == WR_COPIED) { |
1124 | ZIL_STAT_BUMP(zil_itx_copied_count); | |
1125 | ZIL_STAT_INCR(zil_itx_copied_bytes, lrw->lr_length); | |
1126 | } else { | |
34dc7c2f BB |
1127 | char *dbuf; |
1128 | int error; | |
1129 | ||
34dc7c2f BB |
1130 | if (dlen) { |
1131 | ASSERT(itx->itx_wr_state == WR_NEED_COPY); | |
428870ff BB |
1132 | dbuf = lr_buf + reclen; |
1133 | lrw->lr_common.lrc_reclen += dlen; | |
b6ad9671 ED |
1134 | ZIL_STAT_BUMP(zil_itx_needcopy_count); |
1135 | ZIL_STAT_INCR(zil_itx_needcopy_bytes, lrw->lr_length); | |
34dc7c2f BB |
1136 | } else { |
1137 | ASSERT(itx->itx_wr_state == WR_INDIRECT); | |
1138 | dbuf = NULL; | |
b6ad9671 ED |
1139 | ZIL_STAT_BUMP(zil_itx_indirect_count); |
1140 | ZIL_STAT_INCR(zil_itx_indirect_bytes, lrw->lr_length); | |
34dc7c2f BB |
1141 | } |
1142 | error = zilog->zl_get_data( | |
428870ff | 1143 | itx->itx_private, lrw, dbuf, lwb->lwb_zio); |
45d1cae3 BB |
1144 | if (error == EIO) { |
1145 | txg_wait_synced(zilog->zl_dmu_pool, txg); | |
1146 | return (lwb); | |
1147 | } | |
34dc7c2f BB |
1148 | if (error) { |
1149 | ASSERT(error == ENOENT || error == EEXIST || | |
1150 | error == EALREADY); | |
1151 | return (lwb); | |
1152 | } | |
1153 | } | |
1154 | } | |
1155 | ||
428870ff BB |
1156 | /* |
1157 | * We're actually making an entry, so update lrc_seq to be the | |
1158 | * log record sequence number. Note that this is generally not | |
1159 | * equal to the itx sequence number because not all transactions | |
1160 | * are synchronous, and sometimes spa_sync() gets there first. | |
1161 | */ | |
1162 | lrc->lrc_seq = ++zilog->zl_lr_seq; /* we are single threaded */ | |
34dc7c2f BB |
1163 | lwb->lwb_nused += reclen + dlen; |
1164 | lwb->lwb_max_txg = MAX(lwb->lwb_max_txg, txg); | |
428870ff | 1165 | ASSERT3U(lwb->lwb_nused, <=, lwb->lwb_sz); |
c99c9001 | 1166 | ASSERT0(P2PHASE(lwb->lwb_nused, sizeof (uint64_t))); |
34dc7c2f BB |
1167 | |
1168 | return (lwb); | |
1169 | } | |
1170 | ||
1171 | itx_t * | |
1172 | zil_itx_create(uint64_t txtype, size_t lrsize) | |
1173 | { | |
1174 | itx_t *itx; | |
1175 | ||
1176 | lrsize = P2ROUNDUP_TYPED(lrsize, sizeof (uint64_t), size_t); | |
1177 | ||
701b1f81 BB |
1178 | itx = kmem_alloc(offsetof(itx_t, itx_lr) + lrsize, |
1179 | KM_PUSHPAGE | KM_NODEBUG); | |
34dc7c2f BB |
1180 | itx->itx_lr.lrc_txtype = txtype; |
1181 | itx->itx_lr.lrc_reclen = lrsize; | |
1182 | itx->itx_sod = lrsize; /* if write & WR_NEED_COPY will be increased */ | |
1183 | itx->itx_lr.lrc_seq = 0; /* defensive */ | |
572e2857 | 1184 | itx->itx_sync = B_TRUE; /* default is synchronous */ |
34dc7c2f BB |
1185 | |
1186 | return (itx); | |
1187 | } | |
1188 | ||
428870ff BB |
1189 | void |
1190 | zil_itx_destroy(itx_t *itx) | |
1191 | { | |
1192 | kmem_free(itx, offsetof(itx_t, itx_lr) + itx->itx_lr.lrc_reclen); | |
1193 | } | |
1194 | ||
572e2857 BB |
1195 | /* |
1196 | * Free up the sync and async itxs. The itxs_t has already been detached | |
1197 | * so no locks are needed. | |
1198 | */ | |
1199 | static void | |
1200 | zil_itxg_clean(itxs_t *itxs) | |
34dc7c2f | 1201 | { |
572e2857 BB |
1202 | itx_t *itx; |
1203 | list_t *list; | |
1204 | avl_tree_t *t; | |
1205 | void *cookie; | |
1206 | itx_async_node_t *ian; | |
1207 | ||
1208 | list = &itxs->i_sync_list; | |
1209 | while ((itx = list_head(list)) != NULL) { | |
1210 | list_remove(list, itx); | |
1211 | kmem_free(itx, offsetof(itx_t, itx_lr) + | |
1212 | itx->itx_lr.lrc_reclen); | |
1213 | } | |
34dc7c2f | 1214 | |
572e2857 BB |
1215 | cookie = NULL; |
1216 | t = &itxs->i_async_tree; | |
1217 | while ((ian = avl_destroy_nodes(t, &cookie)) != NULL) { | |
1218 | list = &ian->ia_list; | |
1219 | while ((itx = list_head(list)) != NULL) { | |
1220 | list_remove(list, itx); | |
1221 | kmem_free(itx, offsetof(itx_t, itx_lr) + | |
1222 | itx->itx_lr.lrc_reclen); | |
1223 | } | |
1224 | list_destroy(list); | |
1225 | kmem_free(ian, sizeof (itx_async_node_t)); | |
1226 | } | |
1227 | avl_destroy(t); | |
34dc7c2f | 1228 | |
572e2857 BB |
1229 | kmem_free(itxs, sizeof (itxs_t)); |
1230 | } | |
34dc7c2f | 1231 | |
572e2857 BB |
1232 | static int |
1233 | zil_aitx_compare(const void *x1, const void *x2) | |
1234 | { | |
1235 | const uint64_t o1 = ((itx_async_node_t *)x1)->ia_foid; | |
1236 | const uint64_t o2 = ((itx_async_node_t *)x2)->ia_foid; | |
1237 | ||
1238 | if (o1 < o2) | |
1239 | return (-1); | |
1240 | if (o1 > o2) | |
1241 | return (1); | |
1242 | ||
1243 | return (0); | |
34dc7c2f BB |
1244 | } |
1245 | ||
1246 | /* | |
572e2857 | 1247 | * Remove all async itx with the given oid. |
34dc7c2f BB |
1248 | */ |
1249 | static void | |
572e2857 | 1250 | zil_remove_async(zilog_t *zilog, uint64_t oid) |
34dc7c2f | 1251 | { |
572e2857 BB |
1252 | uint64_t otxg, txg; |
1253 | itx_async_node_t *ian; | |
1254 | avl_tree_t *t; | |
1255 | avl_index_t where; | |
34dc7c2f BB |
1256 | list_t clean_list; |
1257 | itx_t *itx; | |
1258 | ||
572e2857 | 1259 | ASSERT(oid != 0); |
34dc7c2f BB |
1260 | list_create(&clean_list, sizeof (itx_t), offsetof(itx_t, itx_node)); |
1261 | ||
572e2857 BB |
1262 | if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */ |
1263 | otxg = ZILTEST_TXG; | |
1264 | else | |
1265 | otxg = spa_last_synced_txg(zilog->zl_spa) + 1; | |
34dc7c2f | 1266 | |
572e2857 BB |
1267 | for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) { |
1268 | itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK]; | |
1269 | ||
1270 | mutex_enter(&itxg->itxg_lock); | |
1271 | if (itxg->itxg_txg != txg) { | |
1272 | mutex_exit(&itxg->itxg_lock); | |
1273 | continue; | |
1274 | } | |
34dc7c2f | 1275 | |
572e2857 BB |
1276 | /* |
1277 | * Locate the object node and append its list. | |
1278 | */ | |
1279 | t = &itxg->itxg_itxs->i_async_tree; | |
1280 | ian = avl_find(t, &oid, &where); | |
1281 | if (ian != NULL) | |
1282 | list_move_tail(&clean_list, &ian->ia_list); | |
1283 | mutex_exit(&itxg->itxg_lock); | |
1284 | } | |
34dc7c2f BB |
1285 | while ((itx = list_head(&clean_list)) != NULL) { |
1286 | list_remove(&clean_list, itx); | |
572e2857 BB |
1287 | kmem_free(itx, offsetof(itx_t, itx_lr) + |
1288 | itx->itx_lr.lrc_reclen); | |
34dc7c2f BB |
1289 | } |
1290 | list_destroy(&clean_list); | |
1291 | } | |
1292 | ||
572e2857 BB |
1293 | void |
1294 | zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx) | |
1295 | { | |
1296 | uint64_t txg; | |
1297 | itxg_t *itxg; | |
1298 | itxs_t *itxs, *clean = NULL; | |
1299 | ||
1300 | /* | |
1301 | * Object ids can be re-instantiated in the next txg so | |
1302 | * remove any async transactions to avoid future leaks. | |
1303 | * This can happen if a fsync occurs on the re-instantiated | |
1304 | * object for a WR_INDIRECT or WR_NEED_COPY write, which gets | |
1305 | * the new file data and flushes a write record for the old object. | |
1306 | */ | |
1307 | if ((itx->itx_lr.lrc_txtype & ~TX_CI) == TX_REMOVE) | |
1308 | zil_remove_async(zilog, itx->itx_oid); | |
1309 | ||
1310 | /* | |
1311 | * Ensure the data of a renamed file is committed before the rename. | |
1312 | */ | |
1313 | if ((itx->itx_lr.lrc_txtype & ~TX_CI) == TX_RENAME) | |
1314 | zil_async_to_sync(zilog, itx->itx_oid); | |
1315 | ||
29809a6c | 1316 | if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) |
572e2857 BB |
1317 | txg = ZILTEST_TXG; |
1318 | else | |
1319 | txg = dmu_tx_get_txg(tx); | |
1320 | ||
1321 | itxg = &zilog->zl_itxg[txg & TXG_MASK]; | |
1322 | mutex_enter(&itxg->itxg_lock); | |
1323 | itxs = itxg->itxg_itxs; | |
1324 | if (itxg->itxg_txg != txg) { | |
1325 | if (itxs != NULL) { | |
1326 | /* | |
1327 | * The zil_clean callback hasn't got around to cleaning | |
1328 | * this itxg. Save the itxs for release below. | |
1329 | * This should be rare. | |
1330 | */ | |
1331 | atomic_add_64(&zilog->zl_itx_list_sz, -itxg->itxg_sod); | |
1332 | itxg->itxg_sod = 0; | |
1333 | clean = itxg->itxg_itxs; | |
1334 | } | |
1335 | ASSERT(itxg->itxg_sod == 0); | |
1336 | itxg->itxg_txg = txg; | |
b8d06fca | 1337 | itxs = itxg->itxg_itxs = kmem_zalloc(sizeof (itxs_t), KM_PUSHPAGE); |
572e2857 BB |
1338 | |
1339 | list_create(&itxs->i_sync_list, sizeof (itx_t), | |
1340 | offsetof(itx_t, itx_node)); | |
1341 | avl_create(&itxs->i_async_tree, zil_aitx_compare, | |
1342 | sizeof (itx_async_node_t), | |
1343 | offsetof(itx_async_node_t, ia_node)); | |
1344 | } | |
1345 | if (itx->itx_sync) { | |
1346 | list_insert_tail(&itxs->i_sync_list, itx); | |
1347 | atomic_add_64(&zilog->zl_itx_list_sz, itx->itx_sod); | |
1348 | itxg->itxg_sod += itx->itx_sod; | |
1349 | } else { | |
1350 | avl_tree_t *t = &itxs->i_async_tree; | |
1351 | uint64_t foid = ((lr_ooo_t *)&itx->itx_lr)->lr_foid; | |
1352 | itx_async_node_t *ian; | |
1353 | avl_index_t where; | |
1354 | ||
1355 | ian = avl_find(t, &foid, &where); | |
1356 | if (ian == NULL) { | |
b8d06fca | 1357 | ian = kmem_alloc(sizeof (itx_async_node_t), KM_PUSHPAGE); |
572e2857 BB |
1358 | list_create(&ian->ia_list, sizeof (itx_t), |
1359 | offsetof(itx_t, itx_node)); | |
1360 | ian->ia_foid = foid; | |
1361 | avl_insert(t, ian, where); | |
1362 | } | |
1363 | list_insert_tail(&ian->ia_list, itx); | |
1364 | } | |
1365 | ||
1366 | itx->itx_lr.lrc_txg = dmu_tx_get_txg(tx); | |
29809a6c | 1367 | zilog_dirty(zilog, txg); |
572e2857 BB |
1368 | mutex_exit(&itxg->itxg_lock); |
1369 | ||
1370 | /* Release the old itxs now we've dropped the lock */ | |
1371 | if (clean != NULL) | |
1372 | zil_itxg_clean(clean); | |
1373 | } | |
1374 | ||
34dc7c2f BB |
1375 | /* |
1376 | * If there are any in-memory intent log transactions which have now been | |
29809a6c MA |
1377 | * synced then start up a taskq to free them. We should only do this after we |
1378 | * have written out the uberblocks (i.e. txg has been comitted) so that | |
1379 | * don't inadvertently clean out in-memory log records that would be required | |
1380 | * by zil_commit(). | |
34dc7c2f BB |
1381 | */ |
1382 | void | |
572e2857 | 1383 | zil_clean(zilog_t *zilog, uint64_t synced_txg) |
34dc7c2f | 1384 | { |
572e2857 BB |
1385 | itxg_t *itxg = &zilog->zl_itxg[synced_txg & TXG_MASK]; |
1386 | itxs_t *clean_me; | |
34dc7c2f | 1387 | |
572e2857 BB |
1388 | mutex_enter(&itxg->itxg_lock); |
1389 | if (itxg->itxg_itxs == NULL || itxg->itxg_txg == ZILTEST_TXG) { | |
1390 | mutex_exit(&itxg->itxg_lock); | |
1391 | return; | |
1392 | } | |
1393 | ASSERT3U(itxg->itxg_txg, <=, synced_txg); | |
1394 | ASSERT(itxg->itxg_txg != 0); | |
1395 | ASSERT(zilog->zl_clean_taskq != NULL); | |
1396 | atomic_add_64(&zilog->zl_itx_list_sz, -itxg->itxg_sod); | |
1397 | itxg->itxg_sod = 0; | |
1398 | clean_me = itxg->itxg_itxs; | |
1399 | itxg->itxg_itxs = NULL; | |
1400 | itxg->itxg_txg = 0; | |
1401 | mutex_exit(&itxg->itxg_lock); | |
1402 | /* | |
1403 | * Preferably start a task queue to free up the old itxs but | |
1404 | * if taskq_dispatch can't allocate resources to do that then | |
1405 | * free it in-line. This should be rare. Note, using TQ_SLEEP | |
1406 | * created a bad performance problem. | |
1407 | */ | |
1408 | if (taskq_dispatch(zilog->zl_clean_taskq, | |
b8864a23 | 1409 | (void (*)(void *))zil_itxg_clean, clean_me, TQ_NOSLEEP) == 0) |
572e2857 BB |
1410 | zil_itxg_clean(clean_me); |
1411 | } | |
1412 | ||
1413 | /* | |
1414 | * Get the list of itxs to commit into zl_itx_commit_list. | |
1415 | */ | |
1416 | static void | |
1417 | zil_get_commit_list(zilog_t *zilog) | |
1418 | { | |
1419 | uint64_t otxg, txg; | |
1420 | list_t *commit_list = &zilog->zl_itx_commit_list; | |
1421 | uint64_t push_sod = 0; | |
1422 | ||
1423 | if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */ | |
1424 | otxg = ZILTEST_TXG; | |
1425 | else | |
1426 | otxg = spa_last_synced_txg(zilog->zl_spa) + 1; | |
1427 | ||
1428 | for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) { | |
1429 | itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK]; | |
1430 | ||
1431 | mutex_enter(&itxg->itxg_lock); | |
1432 | if (itxg->itxg_txg != txg) { | |
1433 | mutex_exit(&itxg->itxg_lock); | |
1434 | continue; | |
1435 | } | |
1436 | ||
1437 | list_move_tail(commit_list, &itxg->itxg_itxs->i_sync_list); | |
1438 | push_sod += itxg->itxg_sod; | |
1439 | itxg->itxg_sod = 0; | |
1440 | ||
1441 | mutex_exit(&itxg->itxg_lock); | |
1442 | } | |
1443 | atomic_add_64(&zilog->zl_itx_list_sz, -push_sod); | |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * Move the async itxs for a specified object to commit into sync lists. | |
1448 | */ | |
1449 | static void | |
1450 | zil_async_to_sync(zilog_t *zilog, uint64_t foid) | |
1451 | { | |
1452 | uint64_t otxg, txg; | |
1453 | itx_async_node_t *ian; | |
1454 | avl_tree_t *t; | |
1455 | avl_index_t where; | |
1456 | ||
1457 | if (spa_freeze_txg(zilog->zl_spa) != UINT64_MAX) /* ziltest support */ | |
1458 | otxg = ZILTEST_TXG; | |
1459 | else | |
1460 | otxg = spa_last_synced_txg(zilog->zl_spa) + 1; | |
1461 | ||
1462 | for (txg = otxg; txg < (otxg + TXG_CONCURRENT_STATES); txg++) { | |
1463 | itxg_t *itxg = &zilog->zl_itxg[txg & TXG_MASK]; | |
1464 | ||
1465 | mutex_enter(&itxg->itxg_lock); | |
1466 | if (itxg->itxg_txg != txg) { | |
1467 | mutex_exit(&itxg->itxg_lock); | |
1468 | continue; | |
1469 | } | |
1470 | ||
1471 | /* | |
1472 | * If a foid is specified then find that node and append its | |
1473 | * list. Otherwise walk the tree appending all the lists | |
1474 | * to the sync list. We add to the end rather than the | |
1475 | * beginning to ensure the create has happened. | |
1476 | */ | |
1477 | t = &itxg->itxg_itxs->i_async_tree; | |
1478 | if (foid != 0) { | |
1479 | ian = avl_find(t, &foid, &where); | |
1480 | if (ian != NULL) { | |
1481 | list_move_tail(&itxg->itxg_itxs->i_sync_list, | |
1482 | &ian->ia_list); | |
1483 | } | |
1484 | } else { | |
1485 | void *cookie = NULL; | |
1486 | ||
1487 | while ((ian = avl_destroy_nodes(t, &cookie)) != NULL) { | |
1488 | list_move_tail(&itxg->itxg_itxs->i_sync_list, | |
1489 | &ian->ia_list); | |
1490 | list_destroy(&ian->ia_list); | |
1491 | kmem_free(ian, sizeof (itx_async_node_t)); | |
1492 | } | |
1493 | } | |
1494 | mutex_exit(&itxg->itxg_lock); | |
34dc7c2f | 1495 | } |
34dc7c2f BB |
1496 | } |
1497 | ||
b128c09f | 1498 | static void |
572e2857 | 1499 | zil_commit_writer(zilog_t *zilog) |
34dc7c2f BB |
1500 | { |
1501 | uint64_t txg; | |
572e2857 | 1502 | itx_t *itx; |
34dc7c2f | 1503 | lwb_t *lwb; |
572e2857 | 1504 | spa_t *spa = zilog->zl_spa; |
428870ff | 1505 | int error = 0; |
34dc7c2f | 1506 | |
b128c09f | 1507 | ASSERT(zilog->zl_root_zio == NULL); |
572e2857 BB |
1508 | |
1509 | mutex_exit(&zilog->zl_lock); | |
1510 | ||
1511 | zil_get_commit_list(zilog); | |
1512 | ||
1513 | /* | |
1514 | * Return if there's nothing to commit before we dirty the fs by | |
1515 | * calling zil_create(). | |
1516 | */ | |
1517 | if (list_head(&zilog->zl_itx_commit_list) == NULL) { | |
1518 | mutex_enter(&zilog->zl_lock); | |
1519 | return; | |
1520 | } | |
34dc7c2f BB |
1521 | |
1522 | if (zilog->zl_suspend) { | |
1523 | lwb = NULL; | |
1524 | } else { | |
1525 | lwb = list_tail(&zilog->zl_lwb_list); | |
572e2857 | 1526 | if (lwb == NULL) |
428870ff | 1527 | lwb = zil_create(zilog); |
34dc7c2f BB |
1528 | } |
1529 | ||
34dc7c2f | 1530 | DTRACE_PROBE1(zil__cw1, zilog_t *, zilog); |
c65aa5b2 | 1531 | while ((itx = list_head(&zilog->zl_itx_commit_list))) { |
34dc7c2f BB |
1532 | txg = itx->itx_lr.lrc_txg; |
1533 | ASSERT(txg); | |
1534 | ||
572e2857 | 1535 | if (txg > spa_last_synced_txg(spa) || txg > spa_freeze_txg(spa)) |
34dc7c2f | 1536 | lwb = zil_lwb_commit(zilog, itx, lwb); |
572e2857 BB |
1537 | list_remove(&zilog->zl_itx_commit_list, itx); |
1538 | kmem_free(itx, offsetof(itx_t, itx_lr) | |
1539 | + itx->itx_lr.lrc_reclen); | |
34dc7c2f BB |
1540 | } |
1541 | DTRACE_PROBE1(zil__cw2, zilog_t *, zilog); | |
34dc7c2f BB |
1542 | |
1543 | /* write the last block out */ | |
1544 | if (lwb != NULL && lwb->lwb_zio != NULL) | |
1545 | lwb = zil_lwb_write_start(zilog, lwb); | |
1546 | ||
34dc7c2f BB |
1547 | zilog->zl_cur_used = 0; |
1548 | ||
1549 | /* | |
1550 | * Wait if necessary for the log blocks to be on stable storage. | |
1551 | */ | |
1552 | if (zilog->zl_root_zio) { | |
428870ff | 1553 | error = zio_wait(zilog->zl_root_zio); |
b128c09f | 1554 | zilog->zl_root_zio = NULL; |
34dc7c2f BB |
1555 | zil_flush_vdevs(zilog); |
1556 | } | |
1557 | ||
428870ff | 1558 | if (error || lwb == NULL) |
34dc7c2f | 1559 | txg_wait_synced(zilog->zl_dmu_pool, 0); |
34dc7c2f BB |
1560 | |
1561 | mutex_enter(&zilog->zl_lock); | |
428870ff BB |
1562 | |
1563 | /* | |
1564 | * Remember the highest committed log sequence number for ztest. | |
1565 | * We only update this value when all the log writes succeeded, | |
1566 | * because ztest wants to ASSERT that it got the whole log chain. | |
1567 | */ | |
1568 | if (error == 0 && lwb != NULL) | |
1569 | zilog->zl_commit_lr_seq = zilog->zl_lr_seq; | |
34dc7c2f BB |
1570 | } |
1571 | ||
1572 | /* | |
572e2857 | 1573 | * Commit zfs transactions to stable storage. |
34dc7c2f | 1574 | * If foid is 0 push out all transactions, otherwise push only those |
572e2857 BB |
1575 | * for that object or might reference that object. |
1576 | * | |
1577 | * itxs are committed in batches. In a heavily stressed zil there will be | |
1578 | * a commit writer thread who is writing out a bunch of itxs to the log | |
1579 | * for a set of committing threads (cthreads) in the same batch as the writer. | |
1580 | * Those cthreads are all waiting on the same cv for that batch. | |
1581 | * | |
1582 | * There will also be a different and growing batch of threads that are | |
1583 | * waiting to commit (qthreads). When the committing batch completes | |
1584 | * a transition occurs such that the cthreads exit and the qthreads become | |
1585 | * cthreads. One of the new cthreads becomes the writer thread for the | |
1586 | * batch. Any new threads arriving become new qthreads. | |
1587 | * | |
1588 | * Only 2 condition variables are needed and there's no transition | |
1589 | * between the two cvs needed. They just flip-flop between qthreads | |
1590 | * and cthreads. | |
1591 | * | |
1592 | * Using this scheme we can efficiently wakeup up only those threads | |
1593 | * that have been committed. | |
34dc7c2f BB |
1594 | */ |
1595 | void | |
572e2857 | 1596 | zil_commit(zilog_t *zilog, uint64_t foid) |
34dc7c2f | 1597 | { |
572e2857 | 1598 | uint64_t mybatch; |
34dc7c2f | 1599 | |
572e2857 BB |
1600 | if (zilog->zl_sync == ZFS_SYNC_DISABLED) |
1601 | return; | |
34dc7c2f | 1602 | |
b6ad9671 ED |
1603 | ZIL_STAT_BUMP(zil_commit_count); |
1604 | ||
572e2857 BB |
1605 | /* move the async itxs for the foid to the sync queues */ |
1606 | zil_async_to_sync(zilog, foid); | |
34dc7c2f | 1607 | |
572e2857 BB |
1608 | mutex_enter(&zilog->zl_lock); |
1609 | mybatch = zilog->zl_next_batch; | |
34dc7c2f | 1610 | while (zilog->zl_writer) { |
572e2857 BB |
1611 | cv_wait(&zilog->zl_cv_batch[mybatch & 1], &zilog->zl_lock); |
1612 | if (mybatch <= zilog->zl_com_batch) { | |
34dc7c2f BB |
1613 | mutex_exit(&zilog->zl_lock); |
1614 | return; | |
1615 | } | |
1616 | } | |
428870ff | 1617 | |
572e2857 BB |
1618 | zilog->zl_next_batch++; |
1619 | zilog->zl_writer = B_TRUE; | |
b6ad9671 | 1620 | ZIL_STAT_BUMP(zil_commit_writer_count); |
572e2857 BB |
1621 | zil_commit_writer(zilog); |
1622 | zilog->zl_com_batch = mybatch; | |
1623 | zilog->zl_writer = B_FALSE; | |
428870ff | 1624 | |
572e2857 BB |
1625 | /* wake up one thread to become the next writer */ |
1626 | cv_signal(&zilog->zl_cv_batch[(mybatch+1) & 1]); | |
428870ff | 1627 | |
572e2857 BB |
1628 | /* wake up all threads waiting for this batch to be committed */ |
1629 | cv_broadcast(&zilog->zl_cv_batch[mybatch & 1]); | |
8c0712fd BB |
1630 | |
1631 | mutex_exit(&zilog->zl_lock); | |
428870ff BB |
1632 | } |
1633 | ||
34dc7c2f BB |
1634 | /* |
1635 | * Called in syncing context to free committed log blocks and update log header. | |
1636 | */ | |
1637 | void | |
1638 | zil_sync(zilog_t *zilog, dmu_tx_t *tx) | |
1639 | { | |
1640 | zil_header_t *zh = zil_header_in_syncing_context(zilog); | |
1641 | uint64_t txg = dmu_tx_get_txg(tx); | |
1642 | spa_t *spa = zilog->zl_spa; | |
428870ff | 1643 | uint64_t *replayed_seq = &zilog->zl_replayed_seq[txg & TXG_MASK]; |
34dc7c2f BB |
1644 | lwb_t *lwb; |
1645 | ||
9babb374 BB |
1646 | /* |
1647 | * We don't zero out zl_destroy_txg, so make sure we don't try | |
1648 | * to destroy it twice. | |
1649 | */ | |
1650 | if (spa_sync_pass(spa) != 1) | |
1651 | return; | |
1652 | ||
34dc7c2f BB |
1653 | mutex_enter(&zilog->zl_lock); |
1654 | ||
1655 | ASSERT(zilog->zl_stop_sync == 0); | |
1656 | ||
428870ff BB |
1657 | if (*replayed_seq != 0) { |
1658 | ASSERT(zh->zh_replay_seq < *replayed_seq); | |
1659 | zh->zh_replay_seq = *replayed_seq; | |
1660 | *replayed_seq = 0; | |
1661 | } | |
34dc7c2f BB |
1662 | |
1663 | if (zilog->zl_destroy_txg == txg) { | |
1664 | blkptr_t blk = zh->zh_log; | |
1665 | ||
1666 | ASSERT(list_head(&zilog->zl_lwb_list) == NULL); | |
34dc7c2f BB |
1667 | |
1668 | bzero(zh, sizeof (zil_header_t)); | |
fb5f0bc8 | 1669 | bzero(zilog->zl_replayed_seq, sizeof (zilog->zl_replayed_seq)); |
34dc7c2f BB |
1670 | |
1671 | if (zilog->zl_keep_first) { | |
1672 | /* | |
1673 | * If this block was part of log chain that couldn't | |
1674 | * be claimed because a device was missing during | |
1675 | * zil_claim(), but that device later returns, | |
1676 | * then this block could erroneously appear valid. | |
1677 | * To guard against this, assign a new GUID to the new | |
1678 | * log chain so it doesn't matter what blk points to. | |
1679 | */ | |
1680 | zil_init_log_chain(zilog, &blk); | |
1681 | zh->zh_log = blk; | |
1682 | } | |
1683 | } | |
1684 | ||
9babb374 | 1685 | while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) { |
34dc7c2f BB |
1686 | zh->zh_log = lwb->lwb_blk; |
1687 | if (lwb->lwb_buf != NULL || lwb->lwb_max_txg > txg) | |
1688 | break; | |
920dd524 ED |
1689 | |
1690 | ASSERT(lwb->lwb_zio == NULL); | |
1691 | ||
34dc7c2f | 1692 | list_remove(&zilog->zl_lwb_list, lwb); |
428870ff | 1693 | zio_free_zil(spa, txg, &lwb->lwb_blk); |
34dc7c2f BB |
1694 | kmem_cache_free(zil_lwb_cache, lwb); |
1695 | ||
1696 | /* | |
1697 | * If we don't have anything left in the lwb list then | |
1698 | * we've had an allocation failure and we need to zero | |
1699 | * out the zil_header blkptr so that we don't end | |
1700 | * up freeing the same block twice. | |
1701 | */ | |
1702 | if (list_head(&zilog->zl_lwb_list) == NULL) | |
1703 | BP_ZERO(&zh->zh_log); | |
1704 | } | |
920dd524 ED |
1705 | |
1706 | /* | |
1707 | * Remove fastwrite on any blocks that have been pre-allocated for | |
1708 | * the next commit. This prevents fastwrite counter pollution by | |
1709 | * unused, long-lived LWBs. | |
1710 | */ | |
1711 | for (; lwb != NULL; lwb = list_next(&zilog->zl_lwb_list, lwb)) { | |
1712 | if (lwb->lwb_fastwrite && !lwb->lwb_zio) { | |
1713 | metaslab_fastwrite_unmark(zilog->zl_spa, &lwb->lwb_blk); | |
1714 | lwb->lwb_fastwrite = 0; | |
1715 | } | |
1716 | } | |
1717 | ||
34dc7c2f BB |
1718 | mutex_exit(&zilog->zl_lock); |
1719 | } | |
1720 | ||
1721 | void | |
1722 | zil_init(void) | |
1723 | { | |
1724 | zil_lwb_cache = kmem_cache_create("zil_lwb_cache", | |
1725 | sizeof (struct lwb), 0, NULL, NULL, NULL, NULL, NULL, 0); | |
b6ad9671 ED |
1726 | |
1727 | zil_ksp = kstat_create("zfs", 0, "zil", "misc", | |
1728 | KSTAT_TYPE_NAMED, sizeof(zil_stats) / sizeof(kstat_named_t), | |
1729 | KSTAT_FLAG_VIRTUAL); | |
1730 | ||
1731 | if (zil_ksp != NULL) { | |
1732 | zil_ksp->ks_data = &zil_stats; | |
1733 | kstat_install(zil_ksp); | |
1734 | } | |
34dc7c2f BB |
1735 | } |
1736 | ||
1737 | void | |
1738 | zil_fini(void) | |
1739 | { | |
1740 | kmem_cache_destroy(zil_lwb_cache); | |
b6ad9671 ED |
1741 | |
1742 | if (zil_ksp != NULL) { | |
1743 | kstat_delete(zil_ksp); | |
1744 | zil_ksp = NULL; | |
1745 | } | |
34dc7c2f BB |
1746 | } |
1747 | ||
428870ff BB |
1748 | void |
1749 | zil_set_sync(zilog_t *zilog, uint64_t sync) | |
1750 | { | |
1751 | zilog->zl_sync = sync; | |
1752 | } | |
1753 | ||
1754 | void | |
1755 | zil_set_logbias(zilog_t *zilog, uint64_t logbias) | |
1756 | { | |
1757 | zilog->zl_logbias = logbias; | |
1758 | } | |
1759 | ||
34dc7c2f BB |
1760 | zilog_t * |
1761 | zil_alloc(objset_t *os, zil_header_t *zh_phys) | |
1762 | { | |
1763 | zilog_t *zilog; | |
d6320ddb | 1764 | int i; |
34dc7c2f | 1765 | |
b8d06fca | 1766 | zilog = kmem_zalloc(sizeof (zilog_t), KM_PUSHPAGE); |
34dc7c2f BB |
1767 | |
1768 | zilog->zl_header = zh_phys; | |
1769 | zilog->zl_os = os; | |
1770 | zilog->zl_spa = dmu_objset_spa(os); | |
1771 | zilog->zl_dmu_pool = dmu_objset_pool(os); | |
1772 | zilog->zl_destroy_txg = TXG_INITIAL - 1; | |
428870ff BB |
1773 | zilog->zl_logbias = dmu_objset_logbias(os); |
1774 | zilog->zl_sync = dmu_objset_syncprop(os); | |
572e2857 | 1775 | zilog->zl_next_batch = 1; |
34dc7c2f BB |
1776 | |
1777 | mutex_init(&zilog->zl_lock, NULL, MUTEX_DEFAULT, NULL); | |
1778 | ||
d6320ddb | 1779 | for (i = 0; i < TXG_SIZE; i++) { |
572e2857 BB |
1780 | mutex_init(&zilog->zl_itxg[i].itxg_lock, NULL, |
1781 | MUTEX_DEFAULT, NULL); | |
1782 | } | |
34dc7c2f BB |
1783 | |
1784 | list_create(&zilog->zl_lwb_list, sizeof (lwb_t), | |
1785 | offsetof(lwb_t, lwb_node)); | |
1786 | ||
572e2857 BB |
1787 | list_create(&zilog->zl_itx_commit_list, sizeof (itx_t), |
1788 | offsetof(itx_t, itx_node)); | |
1789 | ||
34dc7c2f BB |
1790 | mutex_init(&zilog->zl_vdev_lock, NULL, MUTEX_DEFAULT, NULL); |
1791 | ||
1792 | avl_create(&zilog->zl_vdev_tree, zil_vdev_compare, | |
1793 | sizeof (zil_vdev_node_t), offsetof(zil_vdev_node_t, zv_node)); | |
1794 | ||
1795 | cv_init(&zilog->zl_cv_writer, NULL, CV_DEFAULT, NULL); | |
1796 | cv_init(&zilog->zl_cv_suspend, NULL, CV_DEFAULT, NULL); | |
572e2857 BB |
1797 | cv_init(&zilog->zl_cv_batch[0], NULL, CV_DEFAULT, NULL); |
1798 | cv_init(&zilog->zl_cv_batch[1], NULL, CV_DEFAULT, NULL); | |
34dc7c2f BB |
1799 | |
1800 | return (zilog); | |
1801 | } | |
1802 | ||
1803 | void | |
1804 | zil_free(zilog_t *zilog) | |
1805 | { | |
d6320ddb | 1806 | int i; |
34dc7c2f BB |
1807 | |
1808 | zilog->zl_stop_sync = 1; | |
1809 | ||
3e31d2b0 | 1810 | ASSERT(list_is_empty(&zilog->zl_lwb_list)); |
34dc7c2f BB |
1811 | list_destroy(&zilog->zl_lwb_list); |
1812 | ||
1813 | avl_destroy(&zilog->zl_vdev_tree); | |
1814 | mutex_destroy(&zilog->zl_vdev_lock); | |
1815 | ||
572e2857 BB |
1816 | ASSERT(list_is_empty(&zilog->zl_itx_commit_list)); |
1817 | list_destroy(&zilog->zl_itx_commit_list); | |
1818 | ||
d6320ddb | 1819 | for (i = 0; i < TXG_SIZE; i++) { |
572e2857 BB |
1820 | /* |
1821 | * It's possible for an itx to be generated that doesn't dirty | |
1822 | * a txg (e.g. ztest TX_TRUNCATE). So there's no zil_clean() | |
1823 | * callback to remove the entry. We remove those here. | |
1824 | * | |
1825 | * Also free up the ziltest itxs. | |
1826 | */ | |
1827 | if (zilog->zl_itxg[i].itxg_itxs) | |
1828 | zil_itxg_clean(zilog->zl_itxg[i].itxg_itxs); | |
1829 | mutex_destroy(&zilog->zl_itxg[i].itxg_lock); | |
1830 | } | |
1831 | ||
34dc7c2f BB |
1832 | mutex_destroy(&zilog->zl_lock); |
1833 | ||
1834 | cv_destroy(&zilog->zl_cv_writer); | |
1835 | cv_destroy(&zilog->zl_cv_suspend); | |
572e2857 BB |
1836 | cv_destroy(&zilog->zl_cv_batch[0]); |
1837 | cv_destroy(&zilog->zl_cv_batch[1]); | |
34dc7c2f BB |
1838 | |
1839 | kmem_free(zilog, sizeof (zilog_t)); | |
1840 | } | |
1841 | ||
34dc7c2f BB |
1842 | /* |
1843 | * Open an intent log. | |
1844 | */ | |
1845 | zilog_t * | |
1846 | zil_open(objset_t *os, zil_get_data_t *get_data) | |
1847 | { | |
1848 | zilog_t *zilog = dmu_objset_zil(os); | |
1849 | ||
3e31d2b0 ES |
1850 | ASSERT(zilog->zl_clean_taskq == NULL); |
1851 | ASSERT(zilog->zl_get_data == NULL); | |
1852 | ASSERT(list_is_empty(&zilog->zl_lwb_list)); | |
1853 | ||
34dc7c2f BB |
1854 | zilog->zl_get_data = get_data; |
1855 | zilog->zl_clean_taskq = taskq_create("zil_clean", 1, minclsyspri, | |
1856 | 2, 2, TASKQ_PREPOPULATE); | |
1857 | ||
1858 | return (zilog); | |
1859 | } | |
1860 | ||
1861 | /* | |
1862 | * Close an intent log. | |
1863 | */ | |
1864 | void | |
1865 | zil_close(zilog_t *zilog) | |
1866 | { | |
3e31d2b0 | 1867 | lwb_t *lwb; |
572e2857 BB |
1868 | uint64_t txg = 0; |
1869 | ||
1870 | zil_commit(zilog, 0); /* commit all itx */ | |
1871 | ||
34dc7c2f | 1872 | /* |
572e2857 BB |
1873 | * The lwb_max_txg for the stubby lwb will reflect the last activity |
1874 | * for the zil. After a txg_wait_synced() on the txg we know all the | |
1875 | * callbacks have occurred that may clean the zil. Only then can we | |
1876 | * destroy the zl_clean_taskq. | |
34dc7c2f | 1877 | */ |
572e2857 | 1878 | mutex_enter(&zilog->zl_lock); |
3e31d2b0 ES |
1879 | lwb = list_tail(&zilog->zl_lwb_list); |
1880 | if (lwb != NULL) | |
1881 | txg = lwb->lwb_max_txg; | |
572e2857 BB |
1882 | mutex_exit(&zilog->zl_lock); |
1883 | if (txg) | |
34dc7c2f | 1884 | txg_wait_synced(zilog->zl_dmu_pool, txg); |
29809a6c | 1885 | ASSERT(!zilog_is_dirty(zilog)); |
34dc7c2f BB |
1886 | |
1887 | taskq_destroy(zilog->zl_clean_taskq); | |
1888 | zilog->zl_clean_taskq = NULL; | |
1889 | zilog->zl_get_data = NULL; | |
3e31d2b0 ES |
1890 | |
1891 | /* | |
1892 | * We should have only one LWB left on the list; remove it now. | |
1893 | */ | |
1894 | mutex_enter(&zilog->zl_lock); | |
1895 | lwb = list_head(&zilog->zl_lwb_list); | |
1896 | if (lwb != NULL) { | |
1897 | ASSERT(lwb == list_tail(&zilog->zl_lwb_list)); | |
920dd524 ED |
1898 | ASSERT(lwb->lwb_zio == NULL); |
1899 | if (lwb->lwb_fastwrite) | |
1900 | metaslab_fastwrite_unmark(zilog->zl_spa, &lwb->lwb_blk); | |
3e31d2b0 ES |
1901 | list_remove(&zilog->zl_lwb_list, lwb); |
1902 | zio_buf_free(lwb->lwb_buf, lwb->lwb_sz); | |
1903 | kmem_cache_free(zil_lwb_cache, lwb); | |
1904 | } | |
1905 | mutex_exit(&zilog->zl_lock); | |
34dc7c2f BB |
1906 | } |
1907 | ||
1908 | /* | |
1909 | * Suspend an intent log. While in suspended mode, we still honor | |
1910 | * synchronous semantics, but we rely on txg_wait_synced() to do it. | |
1911 | * We suspend the log briefly when taking a snapshot so that the snapshot | |
1912 | * contains all the data it's supposed to, and has an empty intent log. | |
1913 | */ | |
1914 | int | |
1915 | zil_suspend(zilog_t *zilog) | |
1916 | { | |
1917 | const zil_header_t *zh = zilog->zl_header; | |
1918 | ||
1919 | mutex_enter(&zilog->zl_lock); | |
9babb374 | 1920 | if (zh->zh_flags & ZIL_REPLAY_NEEDED) { /* unplayed log */ |
34dc7c2f BB |
1921 | mutex_exit(&zilog->zl_lock); |
1922 | return (EBUSY); | |
1923 | } | |
1924 | if (zilog->zl_suspend++ != 0) { | |
1925 | /* | |
1926 | * Someone else already began a suspend. | |
1927 | * Just wait for them to finish. | |
1928 | */ | |
1929 | while (zilog->zl_suspending) | |
1930 | cv_wait(&zilog->zl_cv_suspend, &zilog->zl_lock); | |
34dc7c2f BB |
1931 | mutex_exit(&zilog->zl_lock); |
1932 | return (0); | |
1933 | } | |
1934 | zilog->zl_suspending = B_TRUE; | |
1935 | mutex_exit(&zilog->zl_lock); | |
1936 | ||
572e2857 | 1937 | zil_commit(zilog, 0); |
34dc7c2f BB |
1938 | |
1939 | zil_destroy(zilog, B_FALSE); | |
1940 | ||
1941 | mutex_enter(&zilog->zl_lock); | |
1942 | zilog->zl_suspending = B_FALSE; | |
1943 | cv_broadcast(&zilog->zl_cv_suspend); | |
1944 | mutex_exit(&zilog->zl_lock); | |
1945 | ||
1946 | return (0); | |
1947 | } | |
1948 | ||
1949 | void | |
1950 | zil_resume(zilog_t *zilog) | |
1951 | { | |
1952 | mutex_enter(&zilog->zl_lock); | |
1953 | ASSERT(zilog->zl_suspend != 0); | |
1954 | zilog->zl_suspend--; | |
1955 | mutex_exit(&zilog->zl_lock); | |
1956 | } | |
1957 | ||
1958 | typedef struct zil_replay_arg { | |
b01615d5 | 1959 | zil_replay_func_t *zr_replay; |
34dc7c2f | 1960 | void *zr_arg; |
34dc7c2f | 1961 | boolean_t zr_byteswap; |
428870ff | 1962 | char *zr_lr; |
34dc7c2f BB |
1963 | } zil_replay_arg_t; |
1964 | ||
428870ff BB |
1965 | static int |
1966 | zil_replay_error(zilog_t *zilog, lr_t *lr, int error) | |
1967 | { | |
1968 | char name[MAXNAMELEN]; | |
1969 | ||
1970 | zilog->zl_replaying_seq--; /* didn't actually replay this one */ | |
1971 | ||
1972 | dmu_objset_name(zilog->zl_os, name); | |
1973 | ||
1974 | cmn_err(CE_WARN, "ZFS replay transaction error %d, " | |
1975 | "dataset %s, seq 0x%llx, txtype %llu %s\n", error, name, | |
1976 | (u_longlong_t)lr->lrc_seq, | |
1977 | (u_longlong_t)(lr->lrc_txtype & ~TX_CI), | |
1978 | (lr->lrc_txtype & TX_CI) ? "CI" : ""); | |
1979 | ||
1980 | return (error); | |
1981 | } | |
1982 | ||
1983 | static int | |
34dc7c2f BB |
1984 | zil_replay_log_record(zilog_t *zilog, lr_t *lr, void *zra, uint64_t claim_txg) |
1985 | { | |
1986 | zil_replay_arg_t *zr = zra; | |
1987 | const zil_header_t *zh = zilog->zl_header; | |
1988 | uint64_t reclen = lr->lrc_reclen; | |
1989 | uint64_t txtype = lr->lrc_txtype; | |
428870ff | 1990 | int error = 0; |
34dc7c2f | 1991 | |
428870ff | 1992 | zilog->zl_replaying_seq = lr->lrc_seq; |
34dc7c2f BB |
1993 | |
1994 | if (lr->lrc_seq <= zh->zh_replay_seq) /* already replayed */ | |
428870ff BB |
1995 | return (0); |
1996 | ||
1997 | if (lr->lrc_txg < claim_txg) /* already committed */ | |
1998 | return (0); | |
34dc7c2f BB |
1999 | |
2000 | /* Strip case-insensitive bit, still present in log record */ | |
2001 | txtype &= ~TX_CI; | |
2002 | ||
428870ff BB |
2003 | if (txtype == 0 || txtype >= TX_MAX_TYPE) |
2004 | return (zil_replay_error(zilog, lr, EINVAL)); | |
2005 | ||
2006 | /* | |
2007 | * If this record type can be logged out of order, the object | |
2008 | * (lr_foid) may no longer exist. That's legitimate, not an error. | |
2009 | */ | |
2010 | if (TX_OOO(txtype)) { | |
2011 | error = dmu_object_info(zilog->zl_os, | |
2012 | ((lr_ooo_t *)lr)->lr_foid, NULL); | |
2013 | if (error == ENOENT || error == EEXIST) | |
2014 | return (0); | |
fb5f0bc8 BB |
2015 | } |
2016 | ||
34dc7c2f BB |
2017 | /* |
2018 | * Make a copy of the data so we can revise and extend it. | |
2019 | */ | |
428870ff BB |
2020 | bcopy(lr, zr->zr_lr, reclen); |
2021 | ||
2022 | /* | |
2023 | * If this is a TX_WRITE with a blkptr, suck in the data. | |
2024 | */ | |
2025 | if (txtype == TX_WRITE && reclen == sizeof (lr_write_t)) { | |
2026 | error = zil_read_log_data(zilog, (lr_write_t *)lr, | |
2027 | zr->zr_lr + reclen); | |
2028 | if (error) | |
2029 | return (zil_replay_error(zilog, lr, error)); | |
2030 | } | |
34dc7c2f BB |
2031 | |
2032 | /* | |
2033 | * The log block containing this lr may have been byteswapped | |
2034 | * so that we can easily examine common fields like lrc_txtype. | |
428870ff | 2035 | * However, the log is a mix of different record types, and only the |
34dc7c2f BB |
2036 | * replay vectors know how to byteswap their records. Therefore, if |
2037 | * the lr was byteswapped, undo it before invoking the replay vector. | |
2038 | */ | |
2039 | if (zr->zr_byteswap) | |
428870ff | 2040 | byteswap_uint64_array(zr->zr_lr, reclen); |
34dc7c2f BB |
2041 | |
2042 | /* | |
2043 | * We must now do two things atomically: replay this log record, | |
fb5f0bc8 BB |
2044 | * and update the log header sequence number to reflect the fact that |
2045 | * we did so. At the end of each replay function the sequence number | |
2046 | * is updated if we are in replay mode. | |
34dc7c2f | 2047 | */ |
428870ff BB |
2048 | error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lr, zr->zr_byteswap); |
2049 | if (error) { | |
34dc7c2f BB |
2050 | /* |
2051 | * The DMU's dnode layer doesn't see removes until the txg | |
2052 | * commits, so a subsequent claim can spuriously fail with | |
fb5f0bc8 | 2053 | * EEXIST. So if we receive any error we try syncing out |
428870ff BB |
2054 | * any removes then retry the transaction. Note that we |
2055 | * specify B_FALSE for byteswap now, so we don't do it twice. | |
34dc7c2f | 2056 | */ |
428870ff BB |
2057 | txg_wait_synced(spa_get_dsl(zilog->zl_spa), 0); |
2058 | error = zr->zr_replay[txtype](zr->zr_arg, zr->zr_lr, B_FALSE); | |
2059 | if (error) | |
2060 | return (zil_replay_error(zilog, lr, error)); | |
34dc7c2f | 2061 | } |
428870ff | 2062 | return (0); |
34dc7c2f BB |
2063 | } |
2064 | ||
2065 | /* ARGSUSED */ | |
428870ff | 2066 | static int |
34dc7c2f BB |
2067 | zil_incr_blks(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) |
2068 | { | |
2069 | zilog->zl_replay_blks++; | |
428870ff BB |
2070 | |
2071 | return (0); | |
34dc7c2f BB |
2072 | } |
2073 | ||
2074 | /* | |
2075 | * If this dataset has a non-empty intent log, replay it and destroy it. | |
2076 | */ | |
2077 | void | |
b01615d5 | 2078 | zil_replay(objset_t *os, void *arg, zil_replay_func_t replay_func[TX_MAX_TYPE]) |
34dc7c2f BB |
2079 | { |
2080 | zilog_t *zilog = dmu_objset_zil(os); | |
2081 | const zil_header_t *zh = zilog->zl_header; | |
2082 | zil_replay_arg_t zr; | |
2083 | ||
9babb374 | 2084 | if ((zh->zh_flags & ZIL_REPLAY_NEEDED) == 0) { |
34dc7c2f BB |
2085 | zil_destroy(zilog, B_TRUE); |
2086 | return; | |
2087 | } | |
2088 | ||
34dc7c2f BB |
2089 | zr.zr_replay = replay_func; |
2090 | zr.zr_arg = arg; | |
34dc7c2f | 2091 | zr.zr_byteswap = BP_SHOULD_BYTESWAP(&zh->zh_log); |
b8d06fca | 2092 | zr.zr_lr = vmem_alloc(2 * SPA_MAXBLOCKSIZE, KM_PUSHPAGE); |
34dc7c2f BB |
2093 | |
2094 | /* | |
2095 | * Wait for in-progress removes to sync before starting replay. | |
2096 | */ | |
2097 | txg_wait_synced(zilog->zl_dmu_pool, 0); | |
2098 | ||
fb5f0bc8 | 2099 | zilog->zl_replay = B_TRUE; |
428870ff | 2100 | zilog->zl_replay_time = ddi_get_lbolt(); |
34dc7c2f BB |
2101 | ASSERT(zilog->zl_replay_blks == 0); |
2102 | (void) zil_parse(zilog, zil_incr_blks, zil_replay_log_record, &zr, | |
2103 | zh->zh_claim_txg); | |
00b46022 | 2104 | vmem_free(zr.zr_lr, 2 * SPA_MAXBLOCKSIZE); |
34dc7c2f BB |
2105 | |
2106 | zil_destroy(zilog, B_FALSE); | |
2107 | txg_wait_synced(zilog->zl_dmu_pool, zilog->zl_destroy_txg); | |
fb5f0bc8 | 2108 | zilog->zl_replay = B_FALSE; |
34dc7c2f BB |
2109 | } |
2110 | ||
428870ff BB |
2111 | boolean_t |
2112 | zil_replaying(zilog_t *zilog, dmu_tx_t *tx) | |
34dc7c2f | 2113 | { |
428870ff BB |
2114 | if (zilog->zl_sync == ZFS_SYNC_DISABLED) |
2115 | return (B_TRUE); | |
34dc7c2f | 2116 | |
428870ff BB |
2117 | if (zilog->zl_replay) { |
2118 | dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); | |
2119 | zilog->zl_replayed_seq[dmu_tx_get_txg(tx) & TXG_MASK] = | |
2120 | zilog->zl_replaying_seq; | |
2121 | return (B_TRUE); | |
34dc7c2f BB |
2122 | } |
2123 | ||
428870ff | 2124 | return (B_FALSE); |
34dc7c2f | 2125 | } |
9babb374 BB |
2126 | |
2127 | /* ARGSUSED */ | |
2128 | int | |
428870ff | 2129 | zil_vdev_offline(const char *osname, void *arg) |
9babb374 BB |
2130 | { |
2131 | objset_t *os; | |
2132 | zilog_t *zilog; | |
2133 | int error; | |
2134 | ||
428870ff | 2135 | error = dmu_objset_hold(osname, FTAG, &os); |
9babb374 BB |
2136 | if (error) |
2137 | return (error); | |
2138 | ||
2139 | zilog = dmu_objset_zil(os); | |
2140 | if (zil_suspend(zilog) != 0) | |
2141 | error = EEXIST; | |
2142 | else | |
2143 | zil_resume(zilog); | |
428870ff | 2144 | dmu_objset_rele(os, FTAG); |
9babb374 BB |
2145 | return (error); |
2146 | } | |
c409e464 BB |
2147 | |
2148 | #if defined(_KERNEL) && defined(HAVE_SPL) | |
2149 | module_param(zil_replay_disable, int, 0644); | |
2150 | MODULE_PARM_DESC(zil_replay_disable, "Disable intent logging replay"); | |
2151 | ||
2152 | module_param(zfs_nocacheflush, int, 0644); | |
2153 | MODULE_PARM_DESC(zfs_nocacheflush, "Disable cache flushes"); | |
ee191e80 ED |
2154 | |
2155 | module_param(zil_slog_limit, ulong, 0644); | |
2156 | MODULE_PARM_DESC(zil_slog_limit, "Max commit bytes to separate log device"); | |
c409e464 | 2157 | #endif |