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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
32 | ||
33 | /* | |
34 | * This file contains the implementation of the xfs_buf_log_item. | |
35 | * It contains the item operations used to manipulate the buf log | |
36 | * items as well as utility routines used by the buffer specific | |
37 | * transaction routines. | |
38 | */ | |
39 | ||
40 | #include "xfs.h" | |
41 | ||
42 | #include "xfs_macros.h" | |
43 | #include "xfs_types.h" | |
44 | #include "xfs_inum.h" | |
45 | #include "xfs_log.h" | |
46 | #include "xfs_trans.h" | |
47 | #include "xfs_buf_item.h" | |
48 | #include "xfs_sb.h" | |
49 | #include "xfs_dir.h" | |
50 | #include "xfs_dmapi.h" | |
51 | #include "xfs_mount.h" | |
52 | #include "xfs_trans_priv.h" | |
53 | #include "xfs_rw.h" | |
54 | #include "xfs_bit.h" | |
55 | #include "xfs_error.h" | |
56 | ||
57 | ||
58 | kmem_zone_t *xfs_buf_item_zone; | |
59 | ||
60 | #ifdef XFS_TRANS_DEBUG | |
61 | /* | |
62 | * This function uses an alternate strategy for tracking the bytes | |
63 | * that the user requests to be logged. This can then be used | |
64 | * in conjunction with the bli_orig array in the buf log item to | |
65 | * catch bugs in our callers' code. | |
66 | * | |
67 | * We also double check the bits set in xfs_buf_item_log using a | |
68 | * simple algorithm to check that every byte is accounted for. | |
69 | */ | |
70 | STATIC void | |
71 | xfs_buf_item_log_debug( | |
72 | xfs_buf_log_item_t *bip, | |
73 | uint first, | |
74 | uint last) | |
75 | { | |
76 | uint x; | |
77 | uint byte; | |
78 | uint nbytes; | |
79 | uint chunk_num; | |
80 | uint word_num; | |
81 | uint bit_num; | |
82 | uint bit_set; | |
83 | uint *wordp; | |
84 | ||
85 | ASSERT(bip->bli_logged != NULL); | |
86 | byte = first; | |
87 | nbytes = last - first + 1; | |
88 | bfset(bip->bli_logged, first, nbytes); | |
89 | for (x = 0; x < nbytes; x++) { | |
90 | chunk_num = byte >> XFS_BLI_SHIFT; | |
91 | word_num = chunk_num >> BIT_TO_WORD_SHIFT; | |
92 | bit_num = chunk_num & (NBWORD - 1); | |
93 | wordp = &(bip->bli_format.blf_data_map[word_num]); | |
94 | bit_set = *wordp & (1 << bit_num); | |
95 | ASSERT(bit_set); | |
96 | byte++; | |
97 | } | |
98 | } | |
99 | ||
100 | /* | |
101 | * This function is called when we flush something into a buffer without | |
102 | * logging it. This happens for things like inodes which are logged | |
103 | * separately from the buffer. | |
104 | */ | |
105 | void | |
106 | xfs_buf_item_flush_log_debug( | |
107 | xfs_buf_t *bp, | |
108 | uint first, | |
109 | uint last) | |
110 | { | |
111 | xfs_buf_log_item_t *bip; | |
112 | uint nbytes; | |
113 | ||
114 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); | |
115 | if ((bip == NULL) || (bip->bli_item.li_type != XFS_LI_BUF)) { | |
116 | return; | |
117 | } | |
118 | ||
119 | ASSERT(bip->bli_logged != NULL); | |
120 | nbytes = last - first + 1; | |
121 | bfset(bip->bli_logged, first, nbytes); | |
122 | } | |
123 | ||
124 | /* | |
125 | * This function is called to verify that our caller's have logged | |
126 | * all the bytes that they changed. | |
127 | * | |
128 | * It does this by comparing the original copy of the buffer stored in | |
129 | * the buf log item's bli_orig array to the current copy of the buffer | |
130 | * and ensuring that all bytes which miscompare are set in the bli_logged | |
131 | * array of the buf log item. | |
132 | */ | |
133 | STATIC void | |
134 | xfs_buf_item_log_check( | |
135 | xfs_buf_log_item_t *bip) | |
136 | { | |
137 | char *orig; | |
138 | char *buffer; | |
139 | int x; | |
140 | xfs_buf_t *bp; | |
141 | ||
142 | ASSERT(bip->bli_orig != NULL); | |
143 | ASSERT(bip->bli_logged != NULL); | |
144 | ||
145 | bp = bip->bli_buf; | |
146 | ASSERT(XFS_BUF_COUNT(bp) > 0); | |
147 | ASSERT(XFS_BUF_PTR(bp) != NULL); | |
148 | orig = bip->bli_orig; | |
149 | buffer = XFS_BUF_PTR(bp); | |
150 | for (x = 0; x < XFS_BUF_COUNT(bp); x++) { | |
151 | if (orig[x] != buffer[x] && !btst(bip->bli_logged, x)) | |
152 | cmn_err(CE_PANIC, | |
153 | "xfs_buf_item_log_check bip %x buffer %x orig %x index %d", | |
154 | bip, bp, orig, x); | |
155 | } | |
156 | } | |
157 | #else | |
158 | #define xfs_buf_item_log_debug(x,y,z) | |
159 | #define xfs_buf_item_log_check(x) | |
160 | #endif | |
161 | ||
162 | STATIC void xfs_buf_error_relse(xfs_buf_t *bp); | |
163 | STATIC void xfs_buf_do_callbacks(xfs_buf_t *bp, xfs_log_item_t *lip); | |
164 | ||
165 | /* | |
166 | * This returns the number of log iovecs needed to log the | |
167 | * given buf log item. | |
168 | * | |
169 | * It calculates this as 1 iovec for the buf log format structure | |
170 | * and 1 for each stretch of non-contiguous chunks to be logged. | |
171 | * Contiguous chunks are logged in a single iovec. | |
172 | * | |
173 | * If the XFS_BLI_STALE flag has been set, then log nothing. | |
174 | */ | |
ba0f32d4 | 175 | STATIC uint |
1da177e4 LT |
176 | xfs_buf_item_size( |
177 | xfs_buf_log_item_t *bip) | |
178 | { | |
179 | uint nvecs; | |
180 | int next_bit; | |
181 | int last_bit; | |
182 | xfs_buf_t *bp; | |
183 | ||
184 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
185 | if (bip->bli_flags & XFS_BLI_STALE) { | |
186 | /* | |
187 | * The buffer is stale, so all we need to log | |
188 | * is the buf log format structure with the | |
189 | * cancel flag in it. | |
190 | */ | |
191 | xfs_buf_item_trace("SIZE STALE", bip); | |
192 | ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL); | |
193 | return 1; | |
194 | } | |
195 | ||
196 | bp = bip->bli_buf; | |
197 | ASSERT(bip->bli_flags & XFS_BLI_LOGGED); | |
198 | nvecs = 1; | |
199 | last_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
200 | bip->bli_format.blf_map_size, 0); | |
201 | ASSERT(last_bit != -1); | |
202 | nvecs++; | |
203 | while (last_bit != -1) { | |
204 | /* | |
205 | * This takes the bit number to start looking from and | |
206 | * returns the next set bit from there. It returns -1 | |
207 | * if there are no more bits set or the start bit is | |
208 | * beyond the end of the bitmap. | |
209 | */ | |
210 | next_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
211 | bip->bli_format.blf_map_size, | |
212 | last_bit + 1); | |
213 | /* | |
214 | * If we run out of bits, leave the loop, | |
215 | * else if we find a new set of bits bump the number of vecs, | |
216 | * else keep scanning the current set of bits. | |
217 | */ | |
218 | if (next_bit == -1) { | |
219 | last_bit = -1; | |
220 | } else if (next_bit != last_bit + 1) { | |
221 | last_bit = next_bit; | |
222 | nvecs++; | |
223 | } else if (xfs_buf_offset(bp, next_bit * XFS_BLI_CHUNK) != | |
224 | (xfs_buf_offset(bp, last_bit * XFS_BLI_CHUNK) + | |
225 | XFS_BLI_CHUNK)) { | |
226 | last_bit = next_bit; | |
227 | nvecs++; | |
228 | } else { | |
229 | last_bit++; | |
230 | } | |
231 | } | |
232 | ||
233 | xfs_buf_item_trace("SIZE NORM", bip); | |
234 | return nvecs; | |
235 | } | |
236 | ||
237 | /* | |
238 | * This is called to fill in the vector of log iovecs for the | |
239 | * given log buf item. It fills the first entry with a buf log | |
240 | * format structure, and the rest point to contiguous chunks | |
241 | * within the buffer. | |
242 | */ | |
ba0f32d4 | 243 | STATIC void |
1da177e4 LT |
244 | xfs_buf_item_format( |
245 | xfs_buf_log_item_t *bip, | |
246 | xfs_log_iovec_t *log_vector) | |
247 | { | |
248 | uint base_size; | |
249 | uint nvecs; | |
250 | xfs_log_iovec_t *vecp; | |
251 | xfs_buf_t *bp; | |
252 | int first_bit; | |
253 | int last_bit; | |
254 | int next_bit; | |
255 | uint nbits; | |
256 | uint buffer_offset; | |
257 | ||
258 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
259 | ASSERT((bip->bli_flags & XFS_BLI_LOGGED) || | |
260 | (bip->bli_flags & XFS_BLI_STALE)); | |
261 | bp = bip->bli_buf; | |
262 | ASSERT(XFS_BUF_BP_ISMAPPED(bp)); | |
263 | vecp = log_vector; | |
264 | ||
265 | /* | |
266 | * The size of the base structure is the size of the | |
267 | * declared structure plus the space for the extra words | |
268 | * of the bitmap. We subtract one from the map size, because | |
269 | * the first element of the bitmap is accounted for in the | |
270 | * size of the base structure. | |
271 | */ | |
272 | base_size = | |
273 | (uint)(sizeof(xfs_buf_log_format_t) + | |
274 | ((bip->bli_format.blf_map_size - 1) * sizeof(uint))); | |
275 | vecp->i_addr = (xfs_caddr_t)&bip->bli_format; | |
276 | vecp->i_len = base_size; | |
7e9c6396 | 277 | XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BFORMAT); |
1da177e4 LT |
278 | vecp++; |
279 | nvecs = 1; | |
280 | ||
281 | if (bip->bli_flags & XFS_BLI_STALE) { | |
282 | /* | |
283 | * The buffer is stale, so all we need to log | |
284 | * is the buf log format structure with the | |
285 | * cancel flag in it. | |
286 | */ | |
287 | xfs_buf_item_trace("FORMAT STALE", bip); | |
288 | ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL); | |
289 | bip->bli_format.blf_size = nvecs; | |
290 | return; | |
291 | } | |
292 | ||
293 | /* | |
294 | * Fill in an iovec for each set of contiguous chunks. | |
295 | */ | |
296 | first_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
297 | bip->bli_format.blf_map_size, 0); | |
298 | ASSERT(first_bit != -1); | |
299 | last_bit = first_bit; | |
300 | nbits = 1; | |
301 | for (;;) { | |
302 | /* | |
303 | * This takes the bit number to start looking from and | |
304 | * returns the next set bit from there. It returns -1 | |
305 | * if there are no more bits set or the start bit is | |
306 | * beyond the end of the bitmap. | |
307 | */ | |
308 | next_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
309 | bip->bli_format.blf_map_size, | |
310 | (uint)last_bit + 1); | |
311 | /* | |
312 | * If we run out of bits fill in the last iovec and get | |
313 | * out of the loop. | |
314 | * Else if we start a new set of bits then fill in the | |
315 | * iovec for the series we were looking at and start | |
316 | * counting the bits in the new one. | |
317 | * Else we're still in the same set of bits so just | |
318 | * keep counting and scanning. | |
319 | */ | |
320 | if (next_bit == -1) { | |
321 | buffer_offset = first_bit * XFS_BLI_CHUNK; | |
322 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); | |
323 | vecp->i_len = nbits * XFS_BLI_CHUNK; | |
7e9c6396 | 324 | XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BCHUNK); |
1da177e4 LT |
325 | nvecs++; |
326 | break; | |
327 | } else if (next_bit != last_bit + 1) { | |
328 | buffer_offset = first_bit * XFS_BLI_CHUNK; | |
329 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); | |
330 | vecp->i_len = nbits * XFS_BLI_CHUNK; | |
7e9c6396 | 331 | XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BCHUNK); |
1da177e4 LT |
332 | nvecs++; |
333 | vecp++; | |
334 | first_bit = next_bit; | |
335 | last_bit = next_bit; | |
336 | nbits = 1; | |
337 | } else if (xfs_buf_offset(bp, next_bit << XFS_BLI_SHIFT) != | |
338 | (xfs_buf_offset(bp, last_bit << XFS_BLI_SHIFT) + | |
339 | XFS_BLI_CHUNK)) { | |
340 | buffer_offset = first_bit * XFS_BLI_CHUNK; | |
341 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); | |
342 | vecp->i_len = nbits * XFS_BLI_CHUNK; | |
7e9c6396 | 343 | XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BCHUNK); |
1da177e4 LT |
344 | /* You would think we need to bump the nvecs here too, but we do not |
345 | * this number is used by recovery, and it gets confused by the boundary | |
346 | * split here | |
347 | * nvecs++; | |
348 | */ | |
349 | vecp++; | |
350 | first_bit = next_bit; | |
351 | last_bit = next_bit; | |
352 | nbits = 1; | |
353 | } else { | |
354 | last_bit++; | |
355 | nbits++; | |
356 | } | |
357 | } | |
358 | bip->bli_format.blf_size = nvecs; | |
359 | ||
360 | /* | |
361 | * Check to make sure everything is consistent. | |
362 | */ | |
363 | xfs_buf_item_trace("FORMAT NORM", bip); | |
364 | xfs_buf_item_log_check(bip); | |
365 | } | |
366 | ||
367 | /* | |
368 | * This is called to pin the buffer associated with the buf log | |
369 | * item in memory so it cannot be written out. Simply call bpin() | |
370 | * on the buffer to do this. | |
371 | */ | |
ba0f32d4 | 372 | STATIC void |
1da177e4 LT |
373 | xfs_buf_item_pin( |
374 | xfs_buf_log_item_t *bip) | |
375 | { | |
376 | xfs_buf_t *bp; | |
377 | ||
378 | bp = bip->bli_buf; | |
379 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
380 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
381 | ASSERT((bip->bli_flags & XFS_BLI_LOGGED) || | |
382 | (bip->bli_flags & XFS_BLI_STALE)); | |
383 | xfs_buf_item_trace("PIN", bip); | |
384 | xfs_buftrace("XFS_PIN", bp); | |
385 | xfs_bpin(bp); | |
386 | } | |
387 | ||
388 | ||
389 | /* | |
390 | * This is called to unpin the buffer associated with the buf log | |
391 | * item which was previously pinned with a call to xfs_buf_item_pin(). | |
392 | * Just call bunpin() on the buffer to do this. | |
393 | * | |
394 | * Also drop the reference to the buf item for the current transaction. | |
395 | * If the XFS_BLI_STALE flag is set and we are the last reference, | |
396 | * then free up the buf log item and unlock the buffer. | |
397 | */ | |
ba0f32d4 | 398 | STATIC void |
1da177e4 LT |
399 | xfs_buf_item_unpin( |
400 | xfs_buf_log_item_t *bip, | |
401 | int stale) | |
402 | { | |
403 | xfs_mount_t *mp; | |
404 | xfs_buf_t *bp; | |
405 | int freed; | |
406 | SPLDECL(s); | |
407 | ||
408 | bp = bip->bli_buf; | |
409 | ASSERT(bp != NULL); | |
410 | ASSERT(XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *) == bip); | |
411 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
412 | xfs_buf_item_trace("UNPIN", bip); | |
413 | xfs_buftrace("XFS_UNPIN", bp); | |
414 | ||
415 | freed = atomic_dec_and_test(&bip->bli_refcount); | |
416 | mp = bip->bli_item.li_mountp; | |
417 | xfs_bunpin(bp); | |
418 | if (freed && stale) { | |
419 | ASSERT(bip->bli_flags & XFS_BLI_STALE); | |
420 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
421 | ASSERT(!(XFS_BUF_ISDELAYWRITE(bp))); | |
422 | ASSERT(XFS_BUF_ISSTALE(bp)); | |
423 | ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL); | |
424 | xfs_buf_item_trace("UNPIN STALE", bip); | |
425 | xfs_buftrace("XFS_UNPIN STALE", bp); | |
426 | /* | |
427 | * If we get called here because of an IO error, we may | |
428 | * or may not have the item on the AIL. xfs_trans_delete_ail() | |
429 | * will take care of that situation. | |
430 | * xfs_trans_delete_ail() drops the AIL lock. | |
431 | */ | |
432 | if (bip->bli_flags & XFS_BLI_STALE_INODE) { | |
433 | xfs_buf_do_callbacks(bp, (xfs_log_item_t *)bip); | |
434 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
435 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
436 | } else { | |
437 | AIL_LOCK(mp,s); | |
438 | xfs_trans_delete_ail(mp, (xfs_log_item_t *)bip, s); | |
439 | xfs_buf_item_relse(bp); | |
440 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) == NULL); | |
441 | } | |
442 | xfs_buf_relse(bp); | |
443 | } | |
444 | } | |
445 | ||
446 | /* | |
447 | * this is called from uncommit in the forced-shutdown path. | |
448 | * we need to check to see if the reference count on the log item | |
449 | * is going to drop to zero. If so, unpin will free the log item | |
450 | * so we need to free the item's descriptor (that points to the item) | |
451 | * in the transaction. | |
452 | */ | |
ba0f32d4 | 453 | STATIC void |
1da177e4 LT |
454 | xfs_buf_item_unpin_remove( |
455 | xfs_buf_log_item_t *bip, | |
456 | xfs_trans_t *tp) | |
457 | { | |
458 | xfs_buf_t *bp; | |
459 | xfs_log_item_desc_t *lidp; | |
460 | int stale = 0; | |
461 | ||
462 | bp = bip->bli_buf; | |
463 | /* | |
464 | * will xfs_buf_item_unpin() call xfs_buf_item_relse()? | |
465 | */ | |
466 | if ((atomic_read(&bip->bli_refcount) == 1) && | |
467 | (bip->bli_flags & XFS_BLI_STALE)) { | |
468 | ASSERT(XFS_BUF_VALUSEMA(bip->bli_buf) <= 0); | |
469 | xfs_buf_item_trace("UNPIN REMOVE", bip); | |
470 | xfs_buftrace("XFS_UNPIN_REMOVE", bp); | |
471 | /* | |
472 | * yes -- clear the xaction descriptor in-use flag | |
473 | * and free the chunk if required. We can safely | |
474 | * do some work here and then call buf_item_unpin | |
475 | * to do the rest because if the if is true, then | |
476 | * we are holding the buffer locked so no one else | |
477 | * will be able to bump up the refcount. | |
478 | */ | |
479 | lidp = xfs_trans_find_item(tp, (xfs_log_item_t *) bip); | |
480 | stale = lidp->lid_flags & XFS_LID_BUF_STALE; | |
481 | xfs_trans_free_item(tp, lidp); | |
482 | /* | |
483 | * Since the transaction no longer refers to the buffer, | |
484 | * the buffer should no longer refer to the transaction. | |
485 | */ | |
486 | XFS_BUF_SET_FSPRIVATE2(bp, NULL); | |
487 | } | |
488 | ||
489 | xfs_buf_item_unpin(bip, stale); | |
490 | ||
491 | return; | |
492 | } | |
493 | ||
494 | /* | |
495 | * This is called to attempt to lock the buffer associated with this | |
496 | * buf log item. Don't sleep on the buffer lock. If we can't get | |
497 | * the lock right away, return 0. If we can get the lock, pull the | |
498 | * buffer from the free list, mark it busy, and return 1. | |
499 | */ | |
ba0f32d4 | 500 | STATIC uint |
1da177e4 LT |
501 | xfs_buf_item_trylock( |
502 | xfs_buf_log_item_t *bip) | |
503 | { | |
504 | xfs_buf_t *bp; | |
505 | ||
506 | bp = bip->bli_buf; | |
507 | ||
508 | if (XFS_BUF_ISPINNED(bp)) { | |
509 | return XFS_ITEM_PINNED; | |
510 | } | |
511 | ||
512 | if (!XFS_BUF_CPSEMA(bp)) { | |
513 | return XFS_ITEM_LOCKED; | |
514 | } | |
515 | ||
516 | /* | |
517 | * Remove the buffer from the free list. Only do this | |
518 | * if it's on the free list. Private buffers like the | |
519 | * superblock buffer are not. | |
520 | */ | |
521 | XFS_BUF_HOLD(bp); | |
522 | ||
523 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
524 | xfs_buf_item_trace("TRYLOCK SUCCESS", bip); | |
525 | return XFS_ITEM_SUCCESS; | |
526 | } | |
527 | ||
528 | /* | |
529 | * Release the buffer associated with the buf log item. | |
530 | * If there is no dirty logged data associated with the | |
531 | * buffer recorded in the buf log item, then free the | |
532 | * buf log item and remove the reference to it in the | |
533 | * buffer. | |
534 | * | |
535 | * This call ignores the recursion count. It is only called | |
536 | * when the buffer should REALLY be unlocked, regardless | |
537 | * of the recursion count. | |
538 | * | |
539 | * If the XFS_BLI_HOLD flag is set in the buf log item, then | |
540 | * free the log item if necessary but do not unlock the buffer. | |
541 | * This is for support of xfs_trans_bhold(). Make sure the | |
542 | * XFS_BLI_HOLD field is cleared if we don't free the item. | |
543 | */ | |
ba0f32d4 | 544 | STATIC void |
1da177e4 LT |
545 | xfs_buf_item_unlock( |
546 | xfs_buf_log_item_t *bip) | |
547 | { | |
548 | int aborted; | |
549 | xfs_buf_t *bp; | |
550 | uint hold; | |
551 | ||
552 | bp = bip->bli_buf; | |
553 | xfs_buftrace("XFS_UNLOCK", bp); | |
554 | ||
555 | /* | |
556 | * Clear the buffer's association with this transaction. | |
557 | */ | |
558 | XFS_BUF_SET_FSPRIVATE2(bp, NULL); | |
559 | ||
560 | /* | |
561 | * If this is a transaction abort, don't return early. | |
562 | * Instead, allow the brelse to happen. | |
563 | * Normally it would be done for stale (cancelled) buffers | |
564 | * at unpin time, but we'll never go through the pin/unpin | |
565 | * cycle if we abort inside commit. | |
566 | */ | |
567 | aborted = (bip->bli_item.li_flags & XFS_LI_ABORTED) != 0; | |
568 | ||
569 | /* | |
570 | * If the buf item is marked stale, then don't do anything. | |
571 | * We'll unlock the buffer and free the buf item when the | |
572 | * buffer is unpinned for the last time. | |
573 | */ | |
574 | if (bip->bli_flags & XFS_BLI_STALE) { | |
575 | bip->bli_flags &= ~XFS_BLI_LOGGED; | |
576 | xfs_buf_item_trace("UNLOCK STALE", bip); | |
577 | ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL); | |
578 | if (!aborted) | |
579 | return; | |
580 | } | |
581 | ||
582 | /* | |
583 | * Drop the transaction's reference to the log item if | |
584 | * it was not logged as part of the transaction. Otherwise | |
585 | * we'll drop the reference in xfs_buf_item_unpin() when | |
586 | * the transaction is really through with the buffer. | |
587 | */ | |
588 | if (!(bip->bli_flags & XFS_BLI_LOGGED)) { | |
589 | atomic_dec(&bip->bli_refcount); | |
590 | } else { | |
591 | /* | |
592 | * Clear the logged flag since this is per | |
593 | * transaction state. | |
594 | */ | |
595 | bip->bli_flags &= ~XFS_BLI_LOGGED; | |
596 | } | |
597 | ||
598 | /* | |
599 | * Before possibly freeing the buf item, determine if we should | |
600 | * release the buffer at the end of this routine. | |
601 | */ | |
602 | hold = bip->bli_flags & XFS_BLI_HOLD; | |
603 | xfs_buf_item_trace("UNLOCK", bip); | |
604 | ||
605 | /* | |
606 | * If the buf item isn't tracking any data, free it. | |
607 | * Otherwise, if XFS_BLI_HOLD is set clear it. | |
608 | */ | |
609 | if (xfs_count_bits(bip->bli_format.blf_data_map, | |
610 | bip->bli_format.blf_map_size, 0) == 0) { | |
611 | xfs_buf_item_relse(bp); | |
612 | } else if (hold) { | |
613 | bip->bli_flags &= ~XFS_BLI_HOLD; | |
614 | } | |
615 | ||
616 | /* | |
617 | * Release the buffer if XFS_BLI_HOLD was not set. | |
618 | */ | |
619 | if (!hold) { | |
620 | xfs_buf_relse(bp); | |
621 | } | |
622 | } | |
623 | ||
624 | /* | |
625 | * This is called to find out where the oldest active copy of the | |
626 | * buf log item in the on disk log resides now that the last log | |
627 | * write of it completed at the given lsn. | |
628 | * We always re-log all the dirty data in a buffer, so usually the | |
629 | * latest copy in the on disk log is the only one that matters. For | |
630 | * those cases we simply return the given lsn. | |
631 | * | |
632 | * The one exception to this is for buffers full of newly allocated | |
633 | * inodes. These buffers are only relogged with the XFS_BLI_INODE_BUF | |
634 | * flag set, indicating that only the di_next_unlinked fields from the | |
635 | * inodes in the buffers will be replayed during recovery. If the | |
636 | * original newly allocated inode images have not yet been flushed | |
637 | * when the buffer is so relogged, then we need to make sure that we | |
638 | * keep the old images in the 'active' portion of the log. We do this | |
639 | * by returning the original lsn of that transaction here rather than | |
640 | * the current one. | |
641 | */ | |
ba0f32d4 | 642 | STATIC xfs_lsn_t |
1da177e4 LT |
643 | xfs_buf_item_committed( |
644 | xfs_buf_log_item_t *bip, | |
645 | xfs_lsn_t lsn) | |
646 | { | |
647 | xfs_buf_item_trace("COMMITTED", bip); | |
648 | if ((bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF) && | |
649 | (bip->bli_item.li_lsn != 0)) { | |
650 | return bip->bli_item.li_lsn; | |
651 | } | |
652 | return (lsn); | |
653 | } | |
654 | ||
655 | /* | |
656 | * This is called when the transaction holding the buffer is aborted. | |
657 | * Just behave as if the transaction had been cancelled. If we're shutting down | |
658 | * and have aborted this transaction, we'll trap this buffer when it tries to | |
659 | * get written out. | |
660 | */ | |
ba0f32d4 | 661 | STATIC void |
1da177e4 LT |
662 | xfs_buf_item_abort( |
663 | xfs_buf_log_item_t *bip) | |
664 | { | |
665 | xfs_buf_t *bp; | |
666 | ||
667 | bp = bip->bli_buf; | |
668 | xfs_buftrace("XFS_ABORT", bp); | |
669 | XFS_BUF_SUPER_STALE(bp); | |
670 | xfs_buf_item_unlock(bip); | |
671 | return; | |
672 | } | |
673 | ||
674 | /* | |
675 | * This is called to asynchronously write the buffer associated with this | |
676 | * buf log item out to disk. The buffer will already have been locked by | |
677 | * a successful call to xfs_buf_item_trylock(). If the buffer still has | |
678 | * B_DELWRI set, then get it going out to disk with a call to bawrite(). | |
679 | * If not, then just release the buffer. | |
680 | */ | |
ba0f32d4 | 681 | STATIC void |
1da177e4 LT |
682 | xfs_buf_item_push( |
683 | xfs_buf_log_item_t *bip) | |
684 | { | |
685 | xfs_buf_t *bp; | |
686 | ||
687 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
688 | xfs_buf_item_trace("PUSH", bip); | |
689 | ||
690 | bp = bip->bli_buf; | |
691 | ||
692 | if (XFS_BUF_ISDELAYWRITE(bp)) { | |
693 | xfs_bawrite(bip->bli_item.li_mountp, bp); | |
694 | } else { | |
695 | xfs_buf_relse(bp); | |
696 | } | |
697 | } | |
698 | ||
699 | /* ARGSUSED */ | |
ba0f32d4 | 700 | STATIC void |
1da177e4 LT |
701 | xfs_buf_item_committing(xfs_buf_log_item_t *bip, xfs_lsn_t commit_lsn) |
702 | { | |
703 | } | |
704 | ||
705 | /* | |
706 | * This is the ops vector shared by all buf log items. | |
707 | */ | |
ba0f32d4 | 708 | STATIC struct xfs_item_ops xfs_buf_item_ops = { |
1da177e4 LT |
709 | .iop_size = (uint(*)(xfs_log_item_t*))xfs_buf_item_size, |
710 | .iop_format = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*)) | |
711 | xfs_buf_item_format, | |
712 | .iop_pin = (void(*)(xfs_log_item_t*))xfs_buf_item_pin, | |
713 | .iop_unpin = (void(*)(xfs_log_item_t*, int))xfs_buf_item_unpin, | |
714 | .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t *)) | |
715 | xfs_buf_item_unpin_remove, | |
716 | .iop_trylock = (uint(*)(xfs_log_item_t*))xfs_buf_item_trylock, | |
717 | .iop_unlock = (void(*)(xfs_log_item_t*))xfs_buf_item_unlock, | |
718 | .iop_committed = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t)) | |
719 | xfs_buf_item_committed, | |
720 | .iop_push = (void(*)(xfs_log_item_t*))xfs_buf_item_push, | |
721 | .iop_abort = (void(*)(xfs_log_item_t*))xfs_buf_item_abort, | |
722 | .iop_pushbuf = NULL, | |
723 | .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t)) | |
724 | xfs_buf_item_committing | |
725 | }; | |
726 | ||
727 | ||
728 | /* | |
729 | * Allocate a new buf log item to go with the given buffer. | |
730 | * Set the buffer's b_fsprivate field to point to the new | |
731 | * buf log item. If there are other item's attached to the | |
732 | * buffer (see xfs_buf_attach_iodone() below), then put the | |
733 | * buf log item at the front. | |
734 | */ | |
735 | void | |
736 | xfs_buf_item_init( | |
737 | xfs_buf_t *bp, | |
738 | xfs_mount_t *mp) | |
739 | { | |
740 | xfs_log_item_t *lip; | |
741 | xfs_buf_log_item_t *bip; | |
742 | int chunks; | |
743 | int map_size; | |
744 | ||
745 | /* | |
746 | * Check to see if there is already a buf log item for | |
747 | * this buffer. If there is, it is guaranteed to be | |
748 | * the first. If we do already have one, there is | |
749 | * nothing to do here so return. | |
750 | */ | |
751 | if (XFS_BUF_FSPRIVATE3(bp, xfs_mount_t *) != mp) | |
752 | XFS_BUF_SET_FSPRIVATE3(bp, mp); | |
753 | XFS_BUF_SET_BDSTRAT_FUNC(bp, xfs_bdstrat_cb); | |
754 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
755 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
756 | if (lip->li_type == XFS_LI_BUF) { | |
757 | return; | |
758 | } | |
759 | } | |
760 | ||
761 | /* | |
762 | * chunks is the number of XFS_BLI_CHUNK size pieces | |
763 | * the buffer can be divided into. Make sure not to | |
764 | * truncate any pieces. map_size is the size of the | |
765 | * bitmap needed to describe the chunks of the buffer. | |
766 | */ | |
767 | chunks = (int)((XFS_BUF_COUNT(bp) + (XFS_BLI_CHUNK - 1)) >> XFS_BLI_SHIFT); | |
768 | map_size = (int)((chunks + NBWORD) >> BIT_TO_WORD_SHIFT); | |
769 | ||
770 | bip = (xfs_buf_log_item_t*)kmem_zone_zalloc(xfs_buf_item_zone, | |
771 | KM_SLEEP); | |
772 | bip->bli_item.li_type = XFS_LI_BUF; | |
773 | bip->bli_item.li_ops = &xfs_buf_item_ops; | |
774 | bip->bli_item.li_mountp = mp; | |
775 | bip->bli_buf = bp; | |
776 | bip->bli_format.blf_type = XFS_LI_BUF; | |
777 | bip->bli_format.blf_blkno = (__int64_t)XFS_BUF_ADDR(bp); | |
778 | bip->bli_format.blf_len = (ushort)BTOBB(XFS_BUF_COUNT(bp)); | |
779 | bip->bli_format.blf_map_size = map_size; | |
780 | #ifdef XFS_BLI_TRACE | |
781 | bip->bli_trace = ktrace_alloc(XFS_BLI_TRACE_SIZE, KM_SLEEP); | |
782 | #endif | |
783 | ||
784 | #ifdef XFS_TRANS_DEBUG | |
785 | /* | |
786 | * Allocate the arrays for tracking what needs to be logged | |
787 | * and what our callers request to be logged. bli_orig | |
788 | * holds a copy of the original, clean buffer for comparison | |
789 | * against, and bli_logged keeps a 1 bit flag per byte in | |
790 | * the buffer to indicate which bytes the callers have asked | |
791 | * to have logged. | |
792 | */ | |
793 | bip->bli_orig = (char *)kmem_alloc(XFS_BUF_COUNT(bp), KM_SLEEP); | |
794 | memcpy(bip->bli_orig, XFS_BUF_PTR(bp), XFS_BUF_COUNT(bp)); | |
795 | bip->bli_logged = (char *)kmem_zalloc(XFS_BUF_COUNT(bp) / NBBY, KM_SLEEP); | |
796 | #endif | |
797 | ||
798 | /* | |
799 | * Put the buf item into the list of items attached to the | |
800 | * buffer at the front. | |
801 | */ | |
802 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
803 | bip->bli_item.li_bio_list = | |
804 | XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
805 | } | |
806 | XFS_BUF_SET_FSPRIVATE(bp, bip); | |
807 | } | |
808 | ||
809 | ||
810 | /* | |
811 | * Mark bytes first through last inclusive as dirty in the buf | |
812 | * item's bitmap. | |
813 | */ | |
814 | void | |
815 | xfs_buf_item_log( | |
816 | xfs_buf_log_item_t *bip, | |
817 | uint first, | |
818 | uint last) | |
819 | { | |
820 | uint first_bit; | |
821 | uint last_bit; | |
822 | uint bits_to_set; | |
823 | uint bits_set; | |
824 | uint word_num; | |
825 | uint *wordp; | |
826 | uint bit; | |
827 | uint end_bit; | |
828 | uint mask; | |
829 | ||
830 | /* | |
831 | * Mark the item as having some dirty data for | |
832 | * quick reference in xfs_buf_item_dirty. | |
833 | */ | |
834 | bip->bli_flags |= XFS_BLI_DIRTY; | |
835 | ||
836 | /* | |
837 | * Convert byte offsets to bit numbers. | |
838 | */ | |
839 | first_bit = first >> XFS_BLI_SHIFT; | |
840 | last_bit = last >> XFS_BLI_SHIFT; | |
841 | ||
842 | /* | |
843 | * Calculate the total number of bits to be set. | |
844 | */ | |
845 | bits_to_set = last_bit - first_bit + 1; | |
846 | ||
847 | /* | |
848 | * Get a pointer to the first word in the bitmap | |
849 | * to set a bit in. | |
850 | */ | |
851 | word_num = first_bit >> BIT_TO_WORD_SHIFT; | |
852 | wordp = &(bip->bli_format.blf_data_map[word_num]); | |
853 | ||
854 | /* | |
855 | * Calculate the starting bit in the first word. | |
856 | */ | |
857 | bit = first_bit & (uint)(NBWORD - 1); | |
858 | ||
859 | /* | |
860 | * First set any bits in the first word of our range. | |
861 | * If it starts at bit 0 of the word, it will be | |
862 | * set below rather than here. That is what the variable | |
863 | * bit tells us. The variable bits_set tracks the number | |
864 | * of bits that have been set so far. End_bit is the number | |
865 | * of the last bit to be set in this word plus one. | |
866 | */ | |
867 | if (bit) { | |
868 | end_bit = MIN(bit + bits_to_set, (uint)NBWORD); | |
869 | mask = ((1 << (end_bit - bit)) - 1) << bit; | |
870 | *wordp |= mask; | |
871 | wordp++; | |
872 | bits_set = end_bit - bit; | |
873 | } else { | |
874 | bits_set = 0; | |
875 | } | |
876 | ||
877 | /* | |
878 | * Now set bits a whole word at a time that are between | |
879 | * first_bit and last_bit. | |
880 | */ | |
881 | while ((bits_to_set - bits_set) >= NBWORD) { | |
882 | *wordp |= 0xffffffff; | |
883 | bits_set += NBWORD; | |
884 | wordp++; | |
885 | } | |
886 | ||
887 | /* | |
888 | * Finally, set any bits left to be set in one last partial word. | |
889 | */ | |
890 | end_bit = bits_to_set - bits_set; | |
891 | if (end_bit) { | |
892 | mask = (1 << end_bit) - 1; | |
893 | *wordp |= mask; | |
894 | } | |
895 | ||
896 | xfs_buf_item_log_debug(bip, first, last); | |
897 | } | |
898 | ||
899 | ||
900 | /* | |
901 | * Return 1 if the buffer has some data that has been logged (at any | |
902 | * point, not just the current transaction) and 0 if not. | |
903 | */ | |
904 | uint | |
905 | xfs_buf_item_dirty( | |
906 | xfs_buf_log_item_t *bip) | |
907 | { | |
908 | return (bip->bli_flags & XFS_BLI_DIRTY); | |
909 | } | |
910 | ||
911 | /* | |
912 | * This is called when the buf log item is no longer needed. It should | |
913 | * free the buf log item associated with the given buffer and clear | |
914 | * the buffer's pointer to the buf log item. If there are no more | |
915 | * items in the list, clear the b_iodone field of the buffer (see | |
916 | * xfs_buf_attach_iodone() below). | |
917 | */ | |
918 | void | |
919 | xfs_buf_item_relse( | |
920 | xfs_buf_t *bp) | |
921 | { | |
922 | xfs_buf_log_item_t *bip; | |
923 | ||
924 | xfs_buftrace("XFS_RELSE", bp); | |
925 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); | |
926 | XFS_BUF_SET_FSPRIVATE(bp, bip->bli_item.li_bio_list); | |
927 | if ((XFS_BUF_FSPRIVATE(bp, void *) == NULL) && | |
928 | (XFS_BUF_IODONE_FUNC(bp) != NULL)) { | |
929 | ASSERT((XFS_BUF_ISUNINITIAL(bp)) == 0); | |
930 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
931 | } | |
932 | ||
933 | #ifdef XFS_TRANS_DEBUG | |
934 | kmem_free(bip->bli_orig, XFS_BUF_COUNT(bp)); | |
935 | bip->bli_orig = NULL; | |
936 | kmem_free(bip->bli_logged, XFS_BUF_COUNT(bp) / NBBY); | |
937 | bip->bli_logged = NULL; | |
938 | #endif /* XFS_TRANS_DEBUG */ | |
939 | ||
940 | #ifdef XFS_BLI_TRACE | |
941 | ktrace_free(bip->bli_trace); | |
942 | #endif | |
943 | kmem_zone_free(xfs_buf_item_zone, bip); | |
944 | } | |
945 | ||
946 | ||
947 | /* | |
948 | * Add the given log item with its callback to the list of callbacks | |
949 | * to be called when the buffer's I/O completes. If it is not set | |
950 | * already, set the buffer's b_iodone() routine to be | |
951 | * xfs_buf_iodone_callbacks() and link the log item into the list of | |
952 | * items rooted at b_fsprivate. Items are always added as the second | |
953 | * entry in the list if there is a first, because the buf item code | |
954 | * assumes that the buf log item is first. | |
955 | */ | |
956 | void | |
957 | xfs_buf_attach_iodone( | |
958 | xfs_buf_t *bp, | |
959 | void (*cb)(xfs_buf_t *, xfs_log_item_t *), | |
960 | xfs_log_item_t *lip) | |
961 | { | |
962 | xfs_log_item_t *head_lip; | |
963 | ||
964 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
965 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
966 | ||
967 | lip->li_cb = cb; | |
968 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
969 | head_lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
970 | lip->li_bio_list = head_lip->li_bio_list; | |
971 | head_lip->li_bio_list = lip; | |
972 | } else { | |
973 | XFS_BUF_SET_FSPRIVATE(bp, lip); | |
974 | } | |
975 | ||
976 | ASSERT((XFS_BUF_IODONE_FUNC(bp) == xfs_buf_iodone_callbacks) || | |
977 | (XFS_BUF_IODONE_FUNC(bp) == NULL)); | |
978 | XFS_BUF_SET_IODONE_FUNC(bp, xfs_buf_iodone_callbacks); | |
979 | } | |
980 | ||
981 | STATIC void | |
982 | xfs_buf_do_callbacks( | |
983 | xfs_buf_t *bp, | |
984 | xfs_log_item_t *lip) | |
985 | { | |
986 | xfs_log_item_t *nlip; | |
987 | ||
988 | while (lip != NULL) { | |
989 | nlip = lip->li_bio_list; | |
990 | ASSERT(lip->li_cb != NULL); | |
991 | /* | |
992 | * Clear the next pointer so we don't have any | |
993 | * confusion if the item is added to another buf. | |
994 | * Don't touch the log item after calling its | |
995 | * callback, because it could have freed itself. | |
996 | */ | |
997 | lip->li_bio_list = NULL; | |
998 | lip->li_cb(bp, lip); | |
999 | lip = nlip; | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * This is the iodone() function for buffers which have had callbacks | |
1005 | * attached to them by xfs_buf_attach_iodone(). It should remove each | |
1006 | * log item from the buffer's list and call the callback of each in turn. | |
1007 | * When done, the buffer's fsprivate field is set to NULL and the buffer | |
1008 | * is unlocked with a call to iodone(). | |
1009 | */ | |
1010 | void | |
1011 | xfs_buf_iodone_callbacks( | |
1012 | xfs_buf_t *bp) | |
1013 | { | |
1014 | xfs_log_item_t *lip; | |
1015 | static ulong lasttime; | |
1016 | static xfs_buftarg_t *lasttarg; | |
1017 | xfs_mount_t *mp; | |
1018 | ||
1019 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
1020 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
1021 | ||
1022 | if (XFS_BUF_GETERROR(bp) != 0) { | |
1023 | /* | |
1024 | * If we've already decided to shutdown the filesystem | |
1025 | * because of IO errors, there's no point in giving this | |
1026 | * a retry. | |
1027 | */ | |
1028 | mp = lip->li_mountp; | |
1029 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
1030 | ASSERT(XFS_BUF_TARGET(bp) == mp->m_ddev_targp); | |
1031 | XFS_BUF_SUPER_STALE(bp); | |
1032 | xfs_buftrace("BUF_IODONE_CB", bp); | |
1033 | xfs_buf_do_callbacks(bp, lip); | |
1034 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
1035 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1036 | ||
1037 | /* | |
1038 | * XFS_SHUT flag gets set when we go thru the | |
1039 | * entire buffer cache and deliberately start | |
1040 | * throwing away delayed write buffers. | |
1041 | * Since there's no biowait done on those, | |
1042 | * we should just brelse them. | |
1043 | */ | |
1044 | if (XFS_BUF_ISSHUT(bp)) { | |
1045 | XFS_BUF_UNSHUT(bp); | |
1046 | xfs_buf_relse(bp); | |
1047 | } else { | |
1048 | xfs_biodone(bp); | |
1049 | } | |
1050 | ||
1051 | return; | |
1052 | } | |
1053 | ||
1054 | if ((XFS_BUF_TARGET(bp) != lasttarg) || | |
1055 | (time_after(jiffies, (lasttime + 5*HZ)))) { | |
1056 | lasttime = jiffies; | |
1057 | prdev("XFS write error in file system meta-data " | |
1058 | "block 0x%llx in %s", | |
1059 | XFS_BUF_TARGET(bp), | |
1060 | (__uint64_t)XFS_BUF_ADDR(bp), mp->m_fsname); | |
1061 | } | |
1062 | lasttarg = XFS_BUF_TARGET(bp); | |
1063 | ||
1064 | if (XFS_BUF_ISASYNC(bp)) { | |
1065 | /* | |
1066 | * If the write was asynchronous then noone will be | |
1067 | * looking for the error. Clear the error state | |
1068 | * and write the buffer out again delayed write. | |
1069 | * | |
1070 | * XXXsup This is OK, so long as we catch these | |
1071 | * before we start the umount; we don't want these | |
1072 | * DELWRI metadata bufs to be hanging around. | |
1073 | */ | |
1074 | XFS_BUF_ERROR(bp,0); /* errno of 0 unsets the flag */ | |
1075 | ||
1076 | if (!(XFS_BUF_ISSTALE(bp))) { | |
1077 | XFS_BUF_DELAYWRITE(bp); | |
1078 | XFS_BUF_DONE(bp); | |
1079 | XFS_BUF_SET_START(bp); | |
1080 | } | |
1081 | ASSERT(XFS_BUF_IODONE_FUNC(bp)); | |
1082 | xfs_buftrace("BUF_IODONE ASYNC", bp); | |
1083 | xfs_buf_relse(bp); | |
1084 | } else { | |
1085 | /* | |
1086 | * If the write of the buffer was not asynchronous, | |
1087 | * then we want to make sure to return the error | |
1088 | * to the caller of bwrite(). Because of this we | |
1089 | * cannot clear the B_ERROR state at this point. | |
1090 | * Instead we install a callback function that | |
1091 | * will be called when the buffer is released, and | |
1092 | * that routine will clear the error state and | |
1093 | * set the buffer to be written out again after | |
1094 | * some delay. | |
1095 | */ | |
1096 | /* We actually overwrite the existing b-relse | |
1097 | function at times, but we're gonna be shutting down | |
1098 | anyway. */ | |
1099 | XFS_BUF_SET_BRELSE_FUNC(bp,xfs_buf_error_relse); | |
1100 | XFS_BUF_DONE(bp); | |
1101 | XFS_BUF_V_IODONESEMA(bp); | |
1102 | } | |
1103 | return; | |
1104 | } | |
1105 | #ifdef XFSERRORDEBUG | |
1106 | xfs_buftrace("XFS BUFCB NOERR", bp); | |
1107 | #endif | |
1108 | xfs_buf_do_callbacks(bp, lip); | |
1109 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
1110 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1111 | xfs_biodone(bp); | |
1112 | } | |
1113 | ||
1114 | /* | |
1115 | * This is a callback routine attached to a buffer which gets an error | |
1116 | * when being written out synchronously. | |
1117 | */ | |
1118 | STATIC void | |
1119 | xfs_buf_error_relse( | |
1120 | xfs_buf_t *bp) | |
1121 | { | |
1122 | xfs_log_item_t *lip; | |
1123 | xfs_mount_t *mp; | |
1124 | ||
1125 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
1126 | mp = (xfs_mount_t *)lip->li_mountp; | |
1127 | ASSERT(XFS_BUF_TARGET(bp) == mp->m_ddev_targp); | |
1128 | ||
1129 | XFS_BUF_STALE(bp); | |
1130 | XFS_BUF_DONE(bp); | |
1131 | XFS_BUF_UNDELAYWRITE(bp); | |
1132 | XFS_BUF_ERROR(bp,0); | |
1133 | xfs_buftrace("BUF_ERROR_RELSE", bp); | |
1134 | if (! XFS_FORCED_SHUTDOWN(mp)) | |
1135 | xfs_force_shutdown(mp, XFS_METADATA_IO_ERROR); | |
1136 | /* | |
1137 | * We have to unpin the pinned buffers so do the | |
1138 | * callbacks. | |
1139 | */ | |
1140 | xfs_buf_do_callbacks(bp, lip); | |
1141 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
1142 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1143 | XFS_BUF_SET_BRELSE_FUNC(bp,NULL); | |
1144 | xfs_buf_relse(bp); | |
1145 | } | |
1146 | ||
1147 | ||
1148 | /* | |
1149 | * This is the iodone() function for buffers which have been | |
1150 | * logged. It is called when they are eventually flushed out. | |
1151 | * It should remove the buf item from the AIL, and free the buf item. | |
1152 | * It is called by xfs_buf_iodone_callbacks() above which will take | |
1153 | * care of cleaning up the buffer itself. | |
1154 | */ | |
1155 | /* ARGSUSED */ | |
1156 | void | |
1157 | xfs_buf_iodone( | |
1158 | xfs_buf_t *bp, | |
1159 | xfs_buf_log_item_t *bip) | |
1160 | { | |
1161 | struct xfs_mount *mp; | |
1162 | SPLDECL(s); | |
1163 | ||
1164 | ASSERT(bip->bli_buf == bp); | |
1165 | ||
1166 | mp = bip->bli_item.li_mountp; | |
1167 | ||
1168 | /* | |
1169 | * If we are forcibly shutting down, this may well be | |
1170 | * off the AIL already. That's because we simulate the | |
1171 | * log-committed callbacks to unpin these buffers. Or we may never | |
1172 | * have put this item on AIL because of the transaction was | |
1173 | * aborted forcibly. xfs_trans_delete_ail() takes care of these. | |
1174 | * | |
1175 | * Either way, AIL is useless if we're forcing a shutdown. | |
1176 | */ | |
1177 | AIL_LOCK(mp,s); | |
1178 | /* | |
1179 | * xfs_trans_delete_ail() drops the AIL lock. | |
1180 | */ | |
1181 | xfs_trans_delete_ail(mp, (xfs_log_item_t *)bip, s); | |
1182 | ||
1183 | #ifdef XFS_TRANS_DEBUG | |
1184 | kmem_free(bip->bli_orig, XFS_BUF_COUNT(bp)); | |
1185 | bip->bli_orig = NULL; | |
1186 | kmem_free(bip->bli_logged, XFS_BUF_COUNT(bp) / NBBY); | |
1187 | bip->bli_logged = NULL; | |
1188 | #endif /* XFS_TRANS_DEBUG */ | |
1189 | ||
1190 | #ifdef XFS_BLI_TRACE | |
1191 | ktrace_free(bip->bli_trace); | |
1192 | #endif | |
1193 | kmem_zone_free(xfs_buf_item_zone, bip); | |
1194 | } | |
1195 | ||
1196 | #if defined(XFS_BLI_TRACE) | |
1197 | void | |
1198 | xfs_buf_item_trace( | |
1199 | char *id, | |
1200 | xfs_buf_log_item_t *bip) | |
1201 | { | |
1202 | xfs_buf_t *bp; | |
1203 | ASSERT(bip->bli_trace != NULL); | |
1204 | ||
1205 | bp = bip->bli_buf; | |
1206 | ktrace_enter(bip->bli_trace, | |
1207 | (void *)id, | |
1208 | (void *)bip->bli_buf, | |
1209 | (void *)((unsigned long)bip->bli_flags), | |
1210 | (void *)((unsigned long)bip->bli_recur), | |
1211 | (void *)((unsigned long)atomic_read(&bip->bli_refcount)), | |
1212 | (void *)((unsigned long) | |
1213 | (0xFFFFFFFF & XFS_BUF_ADDR(bp) >> 32)), | |
1214 | (void *)((unsigned long)(0xFFFFFFFF & XFS_BUF_ADDR(bp))), | |
1215 | (void *)((unsigned long)XFS_BUF_COUNT(bp)), | |
1216 | (void *)((unsigned long)XFS_BUF_BFLAGS(bp)), | |
1217 | XFS_BUF_FSPRIVATE(bp, void *), | |
1218 | XFS_BUF_FSPRIVATE2(bp, void *), | |
1219 | (void *)(unsigned long)XFS_BUF_ISPINNED(bp), | |
1220 | (void *)XFS_BUF_IODONE_FUNC(bp), | |
1221 | (void *)((unsigned long)(XFS_BUF_VALUSEMA(bp))), | |
1222 | (void *)bip->bli_item.li_desc, | |
1223 | (void *)((unsigned long)bip->bli_item.li_flags)); | |
1224 | } | |
1225 | #endif /* XFS_BLI_TRACE */ |