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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 | 24 | #include "xfs_trans.h" |
1da177e4 | 25 | #include "xfs_sb.h" |
1da177e4 LT |
26 | #include "xfs_dmapi.h" |
27 | #include "xfs_mount.h" | |
a844f451 | 28 | #include "xfs_buf_item.h" |
1da177e4 | 29 | #include "xfs_trans_priv.h" |
1da177e4 LT |
30 | #include "xfs_error.h" |
31 | ||
32 | ||
33 | kmem_zone_t *xfs_buf_item_zone; | |
34 | ||
35 | #ifdef XFS_TRANS_DEBUG | |
36 | /* | |
37 | * This function uses an alternate strategy for tracking the bytes | |
38 | * that the user requests to be logged. This can then be used | |
39 | * in conjunction with the bli_orig array in the buf log item to | |
40 | * catch bugs in our callers' code. | |
41 | * | |
42 | * We also double check the bits set in xfs_buf_item_log using a | |
43 | * simple algorithm to check that every byte is accounted for. | |
44 | */ | |
45 | STATIC void | |
46 | xfs_buf_item_log_debug( | |
47 | xfs_buf_log_item_t *bip, | |
48 | uint first, | |
49 | uint last) | |
50 | { | |
51 | uint x; | |
52 | uint byte; | |
53 | uint nbytes; | |
54 | uint chunk_num; | |
55 | uint word_num; | |
56 | uint bit_num; | |
57 | uint bit_set; | |
58 | uint *wordp; | |
59 | ||
60 | ASSERT(bip->bli_logged != NULL); | |
61 | byte = first; | |
62 | nbytes = last - first + 1; | |
63 | bfset(bip->bli_logged, first, nbytes); | |
64 | for (x = 0; x < nbytes; x++) { | |
65 | chunk_num = byte >> XFS_BLI_SHIFT; | |
66 | word_num = chunk_num >> BIT_TO_WORD_SHIFT; | |
67 | bit_num = chunk_num & (NBWORD - 1); | |
68 | wordp = &(bip->bli_format.blf_data_map[word_num]); | |
69 | bit_set = *wordp & (1 << bit_num); | |
70 | ASSERT(bit_set); | |
71 | byte++; | |
72 | } | |
73 | } | |
74 | ||
75 | /* | |
76 | * This function is called when we flush something into a buffer without | |
77 | * logging it. This happens for things like inodes which are logged | |
78 | * separately from the buffer. | |
79 | */ | |
80 | void | |
81 | xfs_buf_item_flush_log_debug( | |
82 | xfs_buf_t *bp, | |
83 | uint first, | |
84 | uint last) | |
85 | { | |
86 | xfs_buf_log_item_t *bip; | |
87 | uint nbytes; | |
88 | ||
89 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); | |
90 | if ((bip == NULL) || (bip->bli_item.li_type != XFS_LI_BUF)) { | |
91 | return; | |
92 | } | |
93 | ||
94 | ASSERT(bip->bli_logged != NULL); | |
95 | nbytes = last - first + 1; | |
96 | bfset(bip->bli_logged, first, nbytes); | |
97 | } | |
98 | ||
99 | /* | |
c41564b5 | 100 | * This function is called to verify that our callers have logged |
1da177e4 LT |
101 | * all the bytes that they changed. |
102 | * | |
103 | * It does this by comparing the original copy of the buffer stored in | |
104 | * the buf log item's bli_orig array to the current copy of the buffer | |
c41564b5 | 105 | * and ensuring that all bytes which mismatch are set in the bli_logged |
1da177e4 LT |
106 | * array of the buf log item. |
107 | */ | |
108 | STATIC void | |
109 | xfs_buf_item_log_check( | |
110 | xfs_buf_log_item_t *bip) | |
111 | { | |
112 | char *orig; | |
113 | char *buffer; | |
114 | int x; | |
115 | xfs_buf_t *bp; | |
116 | ||
117 | ASSERT(bip->bli_orig != NULL); | |
118 | ASSERT(bip->bli_logged != NULL); | |
119 | ||
120 | bp = bip->bli_buf; | |
121 | ASSERT(XFS_BUF_COUNT(bp) > 0); | |
122 | ASSERT(XFS_BUF_PTR(bp) != NULL); | |
123 | orig = bip->bli_orig; | |
124 | buffer = XFS_BUF_PTR(bp); | |
125 | for (x = 0; x < XFS_BUF_COUNT(bp); x++) { | |
126 | if (orig[x] != buffer[x] && !btst(bip->bli_logged, x)) | |
127 | cmn_err(CE_PANIC, | |
128 | "xfs_buf_item_log_check bip %x buffer %x orig %x index %d", | |
129 | bip, bp, orig, x); | |
130 | } | |
131 | } | |
132 | #else | |
133 | #define xfs_buf_item_log_debug(x,y,z) | |
134 | #define xfs_buf_item_log_check(x) | |
135 | #endif | |
136 | ||
137 | STATIC void xfs_buf_error_relse(xfs_buf_t *bp); | |
138 | STATIC void xfs_buf_do_callbacks(xfs_buf_t *bp, xfs_log_item_t *lip); | |
139 | ||
140 | /* | |
141 | * This returns the number of log iovecs needed to log the | |
142 | * given buf log item. | |
143 | * | |
144 | * It calculates this as 1 iovec for the buf log format structure | |
145 | * and 1 for each stretch of non-contiguous chunks to be logged. | |
146 | * Contiguous chunks are logged in a single iovec. | |
147 | * | |
148 | * If the XFS_BLI_STALE flag has been set, then log nothing. | |
149 | */ | |
ba0f32d4 | 150 | STATIC uint |
1da177e4 LT |
151 | xfs_buf_item_size( |
152 | xfs_buf_log_item_t *bip) | |
153 | { | |
154 | uint nvecs; | |
155 | int next_bit; | |
156 | int last_bit; | |
157 | xfs_buf_t *bp; | |
158 | ||
159 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
160 | if (bip->bli_flags & XFS_BLI_STALE) { | |
161 | /* | |
162 | * The buffer is stale, so all we need to log | |
163 | * is the buf log format structure with the | |
164 | * cancel flag in it. | |
165 | */ | |
166 | xfs_buf_item_trace("SIZE STALE", bip); | |
167 | ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL); | |
168 | return 1; | |
169 | } | |
170 | ||
171 | bp = bip->bli_buf; | |
172 | ASSERT(bip->bli_flags & XFS_BLI_LOGGED); | |
173 | nvecs = 1; | |
174 | last_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
175 | bip->bli_format.blf_map_size, 0); | |
176 | ASSERT(last_bit != -1); | |
177 | nvecs++; | |
178 | while (last_bit != -1) { | |
179 | /* | |
180 | * This takes the bit number to start looking from and | |
181 | * returns the next set bit from there. It returns -1 | |
182 | * if there are no more bits set or the start bit is | |
183 | * beyond the end of the bitmap. | |
184 | */ | |
185 | next_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
186 | bip->bli_format.blf_map_size, | |
187 | last_bit + 1); | |
188 | /* | |
189 | * If we run out of bits, leave the loop, | |
190 | * else if we find a new set of bits bump the number of vecs, | |
191 | * else keep scanning the current set of bits. | |
192 | */ | |
193 | if (next_bit == -1) { | |
194 | last_bit = -1; | |
195 | } else if (next_bit != last_bit + 1) { | |
196 | last_bit = next_bit; | |
197 | nvecs++; | |
198 | } else if (xfs_buf_offset(bp, next_bit * XFS_BLI_CHUNK) != | |
199 | (xfs_buf_offset(bp, last_bit * XFS_BLI_CHUNK) + | |
200 | XFS_BLI_CHUNK)) { | |
201 | last_bit = next_bit; | |
202 | nvecs++; | |
203 | } else { | |
204 | last_bit++; | |
205 | } | |
206 | } | |
207 | ||
208 | xfs_buf_item_trace("SIZE NORM", bip); | |
209 | return nvecs; | |
210 | } | |
211 | ||
212 | /* | |
213 | * This is called to fill in the vector of log iovecs for the | |
214 | * given log buf item. It fills the first entry with a buf log | |
215 | * format structure, and the rest point to contiguous chunks | |
216 | * within the buffer. | |
217 | */ | |
ba0f32d4 | 218 | STATIC void |
1da177e4 LT |
219 | xfs_buf_item_format( |
220 | xfs_buf_log_item_t *bip, | |
221 | xfs_log_iovec_t *log_vector) | |
222 | { | |
223 | uint base_size; | |
224 | uint nvecs; | |
225 | xfs_log_iovec_t *vecp; | |
226 | xfs_buf_t *bp; | |
227 | int first_bit; | |
228 | int last_bit; | |
229 | int next_bit; | |
230 | uint nbits; | |
231 | uint buffer_offset; | |
232 | ||
233 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
234 | ASSERT((bip->bli_flags & XFS_BLI_LOGGED) || | |
235 | (bip->bli_flags & XFS_BLI_STALE)); | |
236 | bp = bip->bli_buf; | |
237 | ASSERT(XFS_BUF_BP_ISMAPPED(bp)); | |
238 | vecp = log_vector; | |
239 | ||
240 | /* | |
241 | * The size of the base structure is the size of the | |
242 | * declared structure plus the space for the extra words | |
243 | * of the bitmap. We subtract one from the map size, because | |
244 | * the first element of the bitmap is accounted for in the | |
245 | * size of the base structure. | |
246 | */ | |
247 | base_size = | |
248 | (uint)(sizeof(xfs_buf_log_format_t) + | |
249 | ((bip->bli_format.blf_map_size - 1) * sizeof(uint))); | |
250 | vecp->i_addr = (xfs_caddr_t)&bip->bli_format; | |
251 | vecp->i_len = base_size; | |
7e9c6396 | 252 | XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BFORMAT); |
1da177e4 LT |
253 | vecp++; |
254 | nvecs = 1; | |
255 | ||
256 | if (bip->bli_flags & XFS_BLI_STALE) { | |
257 | /* | |
258 | * The buffer is stale, so all we need to log | |
259 | * is the buf log format structure with the | |
260 | * cancel flag in it. | |
261 | */ | |
262 | xfs_buf_item_trace("FORMAT STALE", bip); | |
263 | ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL); | |
264 | bip->bli_format.blf_size = nvecs; | |
265 | return; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Fill in an iovec for each set of contiguous chunks. | |
270 | */ | |
271 | first_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
272 | bip->bli_format.blf_map_size, 0); | |
273 | ASSERT(first_bit != -1); | |
274 | last_bit = first_bit; | |
275 | nbits = 1; | |
276 | for (;;) { | |
277 | /* | |
278 | * This takes the bit number to start looking from and | |
279 | * returns the next set bit from there. It returns -1 | |
280 | * if there are no more bits set or the start bit is | |
281 | * beyond the end of the bitmap. | |
282 | */ | |
283 | next_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
284 | bip->bli_format.blf_map_size, | |
285 | (uint)last_bit + 1); | |
286 | /* | |
287 | * If we run out of bits fill in the last iovec and get | |
288 | * out of the loop. | |
289 | * Else if we start a new set of bits then fill in the | |
290 | * iovec for the series we were looking at and start | |
291 | * counting the bits in the new one. | |
292 | * Else we're still in the same set of bits so just | |
293 | * keep counting and scanning. | |
294 | */ | |
295 | if (next_bit == -1) { | |
296 | buffer_offset = first_bit * XFS_BLI_CHUNK; | |
297 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); | |
298 | vecp->i_len = nbits * XFS_BLI_CHUNK; | |
7e9c6396 | 299 | XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BCHUNK); |
1da177e4 LT |
300 | nvecs++; |
301 | break; | |
302 | } else if (next_bit != last_bit + 1) { | |
303 | buffer_offset = first_bit * XFS_BLI_CHUNK; | |
304 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); | |
305 | vecp->i_len = nbits * XFS_BLI_CHUNK; | |
7e9c6396 | 306 | XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BCHUNK); |
1da177e4 LT |
307 | nvecs++; |
308 | vecp++; | |
309 | first_bit = next_bit; | |
310 | last_bit = next_bit; | |
311 | nbits = 1; | |
312 | } else if (xfs_buf_offset(bp, next_bit << XFS_BLI_SHIFT) != | |
313 | (xfs_buf_offset(bp, last_bit << XFS_BLI_SHIFT) + | |
314 | XFS_BLI_CHUNK)) { | |
315 | buffer_offset = first_bit * XFS_BLI_CHUNK; | |
316 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); | |
317 | vecp->i_len = nbits * XFS_BLI_CHUNK; | |
7e9c6396 | 318 | XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_BCHUNK); |
1da177e4 LT |
319 | /* You would think we need to bump the nvecs here too, but we do not |
320 | * this number is used by recovery, and it gets confused by the boundary | |
321 | * split here | |
322 | * nvecs++; | |
323 | */ | |
324 | vecp++; | |
325 | first_bit = next_bit; | |
326 | last_bit = next_bit; | |
327 | nbits = 1; | |
328 | } else { | |
329 | last_bit++; | |
330 | nbits++; | |
331 | } | |
332 | } | |
333 | bip->bli_format.blf_size = nvecs; | |
334 | ||
335 | /* | |
336 | * Check to make sure everything is consistent. | |
337 | */ | |
338 | xfs_buf_item_trace("FORMAT NORM", bip); | |
339 | xfs_buf_item_log_check(bip); | |
340 | } | |
341 | ||
342 | /* | |
343 | * This is called to pin the buffer associated with the buf log | |
344 | * item in memory so it cannot be written out. Simply call bpin() | |
345 | * on the buffer to do this. | |
346 | */ | |
ba0f32d4 | 347 | STATIC void |
1da177e4 LT |
348 | xfs_buf_item_pin( |
349 | xfs_buf_log_item_t *bip) | |
350 | { | |
351 | xfs_buf_t *bp; | |
352 | ||
353 | bp = bip->bli_buf; | |
354 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
355 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
356 | ASSERT((bip->bli_flags & XFS_BLI_LOGGED) || | |
357 | (bip->bli_flags & XFS_BLI_STALE)); | |
358 | xfs_buf_item_trace("PIN", bip); | |
359 | xfs_buftrace("XFS_PIN", bp); | |
360 | xfs_bpin(bp); | |
361 | } | |
362 | ||
363 | ||
364 | /* | |
365 | * This is called to unpin the buffer associated with the buf log | |
366 | * item which was previously pinned with a call to xfs_buf_item_pin(). | |
367 | * Just call bunpin() on the buffer to do this. | |
368 | * | |
369 | * Also drop the reference to the buf item for the current transaction. | |
370 | * If the XFS_BLI_STALE flag is set and we are the last reference, | |
371 | * then free up the buf log item and unlock the buffer. | |
372 | */ | |
ba0f32d4 | 373 | STATIC void |
1da177e4 LT |
374 | xfs_buf_item_unpin( |
375 | xfs_buf_log_item_t *bip, | |
376 | int stale) | |
377 | { | |
378 | xfs_mount_t *mp; | |
379 | xfs_buf_t *bp; | |
380 | int freed; | |
381 | SPLDECL(s); | |
382 | ||
383 | bp = bip->bli_buf; | |
384 | ASSERT(bp != NULL); | |
385 | ASSERT(XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *) == bip); | |
386 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
387 | xfs_buf_item_trace("UNPIN", bip); | |
388 | xfs_buftrace("XFS_UNPIN", bp); | |
389 | ||
390 | freed = atomic_dec_and_test(&bip->bli_refcount); | |
391 | mp = bip->bli_item.li_mountp; | |
392 | xfs_bunpin(bp); | |
393 | if (freed && stale) { | |
394 | ASSERT(bip->bli_flags & XFS_BLI_STALE); | |
395 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
396 | ASSERT(!(XFS_BUF_ISDELAYWRITE(bp))); | |
397 | ASSERT(XFS_BUF_ISSTALE(bp)); | |
398 | ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL); | |
399 | xfs_buf_item_trace("UNPIN STALE", bip); | |
400 | xfs_buftrace("XFS_UNPIN STALE", bp); | |
401 | /* | |
402 | * If we get called here because of an IO error, we may | |
403 | * or may not have the item on the AIL. xfs_trans_delete_ail() | |
404 | * will take care of that situation. | |
405 | * xfs_trans_delete_ail() drops the AIL lock. | |
406 | */ | |
407 | if (bip->bli_flags & XFS_BLI_STALE_INODE) { | |
408 | xfs_buf_do_callbacks(bp, (xfs_log_item_t *)bip); | |
409 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
410 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
411 | } else { | |
412 | AIL_LOCK(mp,s); | |
413 | xfs_trans_delete_ail(mp, (xfs_log_item_t *)bip, s); | |
414 | xfs_buf_item_relse(bp); | |
415 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) == NULL); | |
416 | } | |
417 | xfs_buf_relse(bp); | |
418 | } | |
419 | } | |
420 | ||
421 | /* | |
422 | * this is called from uncommit in the forced-shutdown path. | |
423 | * we need to check to see if the reference count on the log item | |
424 | * is going to drop to zero. If so, unpin will free the log item | |
425 | * so we need to free the item's descriptor (that points to the item) | |
426 | * in the transaction. | |
427 | */ | |
ba0f32d4 | 428 | STATIC void |
1da177e4 LT |
429 | xfs_buf_item_unpin_remove( |
430 | xfs_buf_log_item_t *bip, | |
431 | xfs_trans_t *tp) | |
432 | { | |
433 | xfs_buf_t *bp; | |
434 | xfs_log_item_desc_t *lidp; | |
435 | int stale = 0; | |
436 | ||
437 | bp = bip->bli_buf; | |
438 | /* | |
439 | * will xfs_buf_item_unpin() call xfs_buf_item_relse()? | |
440 | */ | |
441 | if ((atomic_read(&bip->bli_refcount) == 1) && | |
442 | (bip->bli_flags & XFS_BLI_STALE)) { | |
443 | ASSERT(XFS_BUF_VALUSEMA(bip->bli_buf) <= 0); | |
444 | xfs_buf_item_trace("UNPIN REMOVE", bip); | |
445 | xfs_buftrace("XFS_UNPIN_REMOVE", bp); | |
446 | /* | |
447 | * yes -- clear the xaction descriptor in-use flag | |
448 | * and free the chunk if required. We can safely | |
449 | * do some work here and then call buf_item_unpin | |
450 | * to do the rest because if the if is true, then | |
451 | * we are holding the buffer locked so no one else | |
452 | * will be able to bump up the refcount. | |
453 | */ | |
454 | lidp = xfs_trans_find_item(tp, (xfs_log_item_t *) bip); | |
455 | stale = lidp->lid_flags & XFS_LID_BUF_STALE; | |
456 | xfs_trans_free_item(tp, lidp); | |
457 | /* | |
458 | * Since the transaction no longer refers to the buffer, | |
459 | * the buffer should no longer refer to the transaction. | |
460 | */ | |
461 | XFS_BUF_SET_FSPRIVATE2(bp, NULL); | |
462 | } | |
463 | ||
464 | xfs_buf_item_unpin(bip, stale); | |
465 | ||
466 | return; | |
467 | } | |
468 | ||
469 | /* | |
470 | * This is called to attempt to lock the buffer associated with this | |
471 | * buf log item. Don't sleep on the buffer lock. If we can't get | |
472 | * the lock right away, return 0. If we can get the lock, pull the | |
473 | * buffer from the free list, mark it busy, and return 1. | |
474 | */ | |
ba0f32d4 | 475 | STATIC uint |
1da177e4 LT |
476 | xfs_buf_item_trylock( |
477 | xfs_buf_log_item_t *bip) | |
478 | { | |
479 | xfs_buf_t *bp; | |
480 | ||
481 | bp = bip->bli_buf; | |
482 | ||
483 | if (XFS_BUF_ISPINNED(bp)) { | |
484 | return XFS_ITEM_PINNED; | |
485 | } | |
486 | ||
487 | if (!XFS_BUF_CPSEMA(bp)) { | |
488 | return XFS_ITEM_LOCKED; | |
489 | } | |
490 | ||
491 | /* | |
492 | * Remove the buffer from the free list. Only do this | |
493 | * if it's on the free list. Private buffers like the | |
494 | * superblock buffer are not. | |
495 | */ | |
496 | XFS_BUF_HOLD(bp); | |
497 | ||
498 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
499 | xfs_buf_item_trace("TRYLOCK SUCCESS", bip); | |
500 | return XFS_ITEM_SUCCESS; | |
501 | } | |
502 | ||
503 | /* | |
504 | * Release the buffer associated with the buf log item. | |
505 | * If there is no dirty logged data associated with the | |
506 | * buffer recorded in the buf log item, then free the | |
507 | * buf log item and remove the reference to it in the | |
508 | * buffer. | |
509 | * | |
510 | * This call ignores the recursion count. It is only called | |
511 | * when the buffer should REALLY be unlocked, regardless | |
512 | * of the recursion count. | |
513 | * | |
514 | * If the XFS_BLI_HOLD flag is set in the buf log item, then | |
515 | * free the log item if necessary but do not unlock the buffer. | |
516 | * This is for support of xfs_trans_bhold(). Make sure the | |
517 | * XFS_BLI_HOLD field is cleared if we don't free the item. | |
518 | */ | |
ba0f32d4 | 519 | STATIC void |
1da177e4 LT |
520 | xfs_buf_item_unlock( |
521 | xfs_buf_log_item_t *bip) | |
522 | { | |
523 | int aborted; | |
524 | xfs_buf_t *bp; | |
525 | uint hold; | |
526 | ||
527 | bp = bip->bli_buf; | |
528 | xfs_buftrace("XFS_UNLOCK", bp); | |
529 | ||
530 | /* | |
531 | * Clear the buffer's association with this transaction. | |
532 | */ | |
533 | XFS_BUF_SET_FSPRIVATE2(bp, NULL); | |
534 | ||
535 | /* | |
536 | * If this is a transaction abort, don't return early. | |
537 | * Instead, allow the brelse to happen. | |
538 | * Normally it would be done for stale (cancelled) buffers | |
539 | * at unpin time, but we'll never go through the pin/unpin | |
540 | * cycle if we abort inside commit. | |
541 | */ | |
542 | aborted = (bip->bli_item.li_flags & XFS_LI_ABORTED) != 0; | |
543 | ||
544 | /* | |
545 | * If the buf item is marked stale, then don't do anything. | |
546 | * We'll unlock the buffer and free the buf item when the | |
547 | * buffer is unpinned for the last time. | |
548 | */ | |
549 | if (bip->bli_flags & XFS_BLI_STALE) { | |
550 | bip->bli_flags &= ~XFS_BLI_LOGGED; | |
551 | xfs_buf_item_trace("UNLOCK STALE", bip); | |
552 | ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL); | |
553 | if (!aborted) | |
554 | return; | |
555 | } | |
556 | ||
557 | /* | |
558 | * Drop the transaction's reference to the log item if | |
559 | * it was not logged as part of the transaction. Otherwise | |
560 | * we'll drop the reference in xfs_buf_item_unpin() when | |
561 | * the transaction is really through with the buffer. | |
562 | */ | |
563 | if (!(bip->bli_flags & XFS_BLI_LOGGED)) { | |
564 | atomic_dec(&bip->bli_refcount); | |
565 | } else { | |
566 | /* | |
567 | * Clear the logged flag since this is per | |
568 | * transaction state. | |
569 | */ | |
570 | bip->bli_flags &= ~XFS_BLI_LOGGED; | |
571 | } | |
572 | ||
573 | /* | |
574 | * Before possibly freeing the buf item, determine if we should | |
575 | * release the buffer at the end of this routine. | |
576 | */ | |
577 | hold = bip->bli_flags & XFS_BLI_HOLD; | |
578 | xfs_buf_item_trace("UNLOCK", bip); | |
579 | ||
580 | /* | |
581 | * If the buf item isn't tracking any data, free it. | |
582 | * Otherwise, if XFS_BLI_HOLD is set clear it. | |
583 | */ | |
584 | if (xfs_count_bits(bip->bli_format.blf_data_map, | |
585 | bip->bli_format.blf_map_size, 0) == 0) { | |
586 | xfs_buf_item_relse(bp); | |
587 | } else if (hold) { | |
588 | bip->bli_flags &= ~XFS_BLI_HOLD; | |
589 | } | |
590 | ||
591 | /* | |
592 | * Release the buffer if XFS_BLI_HOLD was not set. | |
593 | */ | |
594 | if (!hold) { | |
595 | xfs_buf_relse(bp); | |
596 | } | |
597 | } | |
598 | ||
599 | /* | |
600 | * This is called to find out where the oldest active copy of the | |
601 | * buf log item in the on disk log resides now that the last log | |
602 | * write of it completed at the given lsn. | |
603 | * We always re-log all the dirty data in a buffer, so usually the | |
604 | * latest copy in the on disk log is the only one that matters. For | |
605 | * those cases we simply return the given lsn. | |
606 | * | |
607 | * The one exception to this is for buffers full of newly allocated | |
608 | * inodes. These buffers are only relogged with the XFS_BLI_INODE_BUF | |
609 | * flag set, indicating that only the di_next_unlinked fields from the | |
610 | * inodes in the buffers will be replayed during recovery. If the | |
611 | * original newly allocated inode images have not yet been flushed | |
612 | * when the buffer is so relogged, then we need to make sure that we | |
613 | * keep the old images in the 'active' portion of the log. We do this | |
614 | * by returning the original lsn of that transaction here rather than | |
615 | * the current one. | |
616 | */ | |
ba0f32d4 | 617 | STATIC xfs_lsn_t |
1da177e4 LT |
618 | xfs_buf_item_committed( |
619 | xfs_buf_log_item_t *bip, | |
620 | xfs_lsn_t lsn) | |
621 | { | |
622 | xfs_buf_item_trace("COMMITTED", bip); | |
623 | if ((bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF) && | |
624 | (bip->bli_item.li_lsn != 0)) { | |
625 | return bip->bli_item.li_lsn; | |
626 | } | |
627 | return (lsn); | |
628 | } | |
629 | ||
630 | /* | |
631 | * This is called when the transaction holding the buffer is aborted. | |
632 | * Just behave as if the transaction had been cancelled. If we're shutting down | |
633 | * and have aborted this transaction, we'll trap this buffer when it tries to | |
634 | * get written out. | |
635 | */ | |
ba0f32d4 | 636 | STATIC void |
1da177e4 LT |
637 | xfs_buf_item_abort( |
638 | xfs_buf_log_item_t *bip) | |
639 | { | |
640 | xfs_buf_t *bp; | |
641 | ||
642 | bp = bip->bli_buf; | |
643 | xfs_buftrace("XFS_ABORT", bp); | |
644 | XFS_BUF_SUPER_STALE(bp); | |
645 | xfs_buf_item_unlock(bip); | |
646 | return; | |
647 | } | |
648 | ||
649 | /* | |
650 | * This is called to asynchronously write the buffer associated with this | |
651 | * buf log item out to disk. The buffer will already have been locked by | |
652 | * a successful call to xfs_buf_item_trylock(). If the buffer still has | |
653 | * B_DELWRI set, then get it going out to disk with a call to bawrite(). | |
654 | * If not, then just release the buffer. | |
655 | */ | |
ba0f32d4 | 656 | STATIC void |
1da177e4 LT |
657 | xfs_buf_item_push( |
658 | xfs_buf_log_item_t *bip) | |
659 | { | |
660 | xfs_buf_t *bp; | |
661 | ||
662 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
663 | xfs_buf_item_trace("PUSH", bip); | |
664 | ||
665 | bp = bip->bli_buf; | |
666 | ||
667 | if (XFS_BUF_ISDELAYWRITE(bp)) { | |
668 | xfs_bawrite(bip->bli_item.li_mountp, bp); | |
669 | } else { | |
670 | xfs_buf_relse(bp); | |
671 | } | |
672 | } | |
673 | ||
674 | /* ARGSUSED */ | |
ba0f32d4 | 675 | STATIC void |
1da177e4 LT |
676 | xfs_buf_item_committing(xfs_buf_log_item_t *bip, xfs_lsn_t commit_lsn) |
677 | { | |
678 | } | |
679 | ||
680 | /* | |
681 | * This is the ops vector shared by all buf log items. | |
682 | */ | |
ba0f32d4 | 683 | STATIC struct xfs_item_ops xfs_buf_item_ops = { |
1da177e4 LT |
684 | .iop_size = (uint(*)(xfs_log_item_t*))xfs_buf_item_size, |
685 | .iop_format = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*)) | |
686 | xfs_buf_item_format, | |
687 | .iop_pin = (void(*)(xfs_log_item_t*))xfs_buf_item_pin, | |
688 | .iop_unpin = (void(*)(xfs_log_item_t*, int))xfs_buf_item_unpin, | |
689 | .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t *)) | |
690 | xfs_buf_item_unpin_remove, | |
691 | .iop_trylock = (uint(*)(xfs_log_item_t*))xfs_buf_item_trylock, | |
692 | .iop_unlock = (void(*)(xfs_log_item_t*))xfs_buf_item_unlock, | |
693 | .iop_committed = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t)) | |
694 | xfs_buf_item_committed, | |
695 | .iop_push = (void(*)(xfs_log_item_t*))xfs_buf_item_push, | |
696 | .iop_abort = (void(*)(xfs_log_item_t*))xfs_buf_item_abort, | |
697 | .iop_pushbuf = NULL, | |
698 | .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t)) | |
699 | xfs_buf_item_committing | |
700 | }; | |
701 | ||
702 | ||
703 | /* | |
704 | * Allocate a new buf log item to go with the given buffer. | |
705 | * Set the buffer's b_fsprivate field to point to the new | |
706 | * buf log item. If there are other item's attached to the | |
707 | * buffer (see xfs_buf_attach_iodone() below), then put the | |
708 | * buf log item at the front. | |
709 | */ | |
710 | void | |
711 | xfs_buf_item_init( | |
712 | xfs_buf_t *bp, | |
713 | xfs_mount_t *mp) | |
714 | { | |
715 | xfs_log_item_t *lip; | |
716 | xfs_buf_log_item_t *bip; | |
717 | int chunks; | |
718 | int map_size; | |
719 | ||
720 | /* | |
721 | * Check to see if there is already a buf log item for | |
722 | * this buffer. If there is, it is guaranteed to be | |
723 | * the first. If we do already have one, there is | |
724 | * nothing to do here so return. | |
725 | */ | |
726 | if (XFS_BUF_FSPRIVATE3(bp, xfs_mount_t *) != mp) | |
727 | XFS_BUF_SET_FSPRIVATE3(bp, mp); | |
728 | XFS_BUF_SET_BDSTRAT_FUNC(bp, xfs_bdstrat_cb); | |
729 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
730 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
731 | if (lip->li_type == XFS_LI_BUF) { | |
732 | return; | |
733 | } | |
734 | } | |
735 | ||
736 | /* | |
737 | * chunks is the number of XFS_BLI_CHUNK size pieces | |
738 | * the buffer can be divided into. Make sure not to | |
739 | * truncate any pieces. map_size is the size of the | |
740 | * bitmap needed to describe the chunks of the buffer. | |
741 | */ | |
742 | chunks = (int)((XFS_BUF_COUNT(bp) + (XFS_BLI_CHUNK - 1)) >> XFS_BLI_SHIFT); | |
743 | map_size = (int)((chunks + NBWORD) >> BIT_TO_WORD_SHIFT); | |
744 | ||
745 | bip = (xfs_buf_log_item_t*)kmem_zone_zalloc(xfs_buf_item_zone, | |
746 | KM_SLEEP); | |
747 | bip->bli_item.li_type = XFS_LI_BUF; | |
748 | bip->bli_item.li_ops = &xfs_buf_item_ops; | |
749 | bip->bli_item.li_mountp = mp; | |
750 | bip->bli_buf = bp; | |
751 | bip->bli_format.blf_type = XFS_LI_BUF; | |
752 | bip->bli_format.blf_blkno = (__int64_t)XFS_BUF_ADDR(bp); | |
753 | bip->bli_format.blf_len = (ushort)BTOBB(XFS_BUF_COUNT(bp)); | |
754 | bip->bli_format.blf_map_size = map_size; | |
755 | #ifdef XFS_BLI_TRACE | |
756 | bip->bli_trace = ktrace_alloc(XFS_BLI_TRACE_SIZE, KM_SLEEP); | |
757 | #endif | |
758 | ||
759 | #ifdef XFS_TRANS_DEBUG | |
760 | /* | |
761 | * Allocate the arrays for tracking what needs to be logged | |
762 | * and what our callers request to be logged. bli_orig | |
763 | * holds a copy of the original, clean buffer for comparison | |
764 | * against, and bli_logged keeps a 1 bit flag per byte in | |
765 | * the buffer to indicate which bytes the callers have asked | |
766 | * to have logged. | |
767 | */ | |
768 | bip->bli_orig = (char *)kmem_alloc(XFS_BUF_COUNT(bp), KM_SLEEP); | |
769 | memcpy(bip->bli_orig, XFS_BUF_PTR(bp), XFS_BUF_COUNT(bp)); | |
770 | bip->bli_logged = (char *)kmem_zalloc(XFS_BUF_COUNT(bp) / NBBY, KM_SLEEP); | |
771 | #endif | |
772 | ||
773 | /* | |
774 | * Put the buf item into the list of items attached to the | |
775 | * buffer at the front. | |
776 | */ | |
777 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
778 | bip->bli_item.li_bio_list = | |
779 | XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
780 | } | |
781 | XFS_BUF_SET_FSPRIVATE(bp, bip); | |
782 | } | |
783 | ||
784 | ||
785 | /* | |
786 | * Mark bytes first through last inclusive as dirty in the buf | |
787 | * item's bitmap. | |
788 | */ | |
789 | void | |
790 | xfs_buf_item_log( | |
791 | xfs_buf_log_item_t *bip, | |
792 | uint first, | |
793 | uint last) | |
794 | { | |
795 | uint first_bit; | |
796 | uint last_bit; | |
797 | uint bits_to_set; | |
798 | uint bits_set; | |
799 | uint word_num; | |
800 | uint *wordp; | |
801 | uint bit; | |
802 | uint end_bit; | |
803 | uint mask; | |
804 | ||
805 | /* | |
806 | * Mark the item as having some dirty data for | |
807 | * quick reference in xfs_buf_item_dirty. | |
808 | */ | |
809 | bip->bli_flags |= XFS_BLI_DIRTY; | |
810 | ||
811 | /* | |
812 | * Convert byte offsets to bit numbers. | |
813 | */ | |
814 | first_bit = first >> XFS_BLI_SHIFT; | |
815 | last_bit = last >> XFS_BLI_SHIFT; | |
816 | ||
817 | /* | |
818 | * Calculate the total number of bits to be set. | |
819 | */ | |
820 | bits_to_set = last_bit - first_bit + 1; | |
821 | ||
822 | /* | |
823 | * Get a pointer to the first word in the bitmap | |
824 | * to set a bit in. | |
825 | */ | |
826 | word_num = first_bit >> BIT_TO_WORD_SHIFT; | |
827 | wordp = &(bip->bli_format.blf_data_map[word_num]); | |
828 | ||
829 | /* | |
830 | * Calculate the starting bit in the first word. | |
831 | */ | |
832 | bit = first_bit & (uint)(NBWORD - 1); | |
833 | ||
834 | /* | |
835 | * First set any bits in the first word of our range. | |
836 | * If it starts at bit 0 of the word, it will be | |
837 | * set below rather than here. That is what the variable | |
838 | * bit tells us. The variable bits_set tracks the number | |
839 | * of bits that have been set so far. End_bit is the number | |
840 | * of the last bit to be set in this word plus one. | |
841 | */ | |
842 | if (bit) { | |
843 | end_bit = MIN(bit + bits_to_set, (uint)NBWORD); | |
844 | mask = ((1 << (end_bit - bit)) - 1) << bit; | |
845 | *wordp |= mask; | |
846 | wordp++; | |
847 | bits_set = end_bit - bit; | |
848 | } else { | |
849 | bits_set = 0; | |
850 | } | |
851 | ||
852 | /* | |
853 | * Now set bits a whole word at a time that are between | |
854 | * first_bit and last_bit. | |
855 | */ | |
856 | while ((bits_to_set - bits_set) >= NBWORD) { | |
857 | *wordp |= 0xffffffff; | |
858 | bits_set += NBWORD; | |
859 | wordp++; | |
860 | } | |
861 | ||
862 | /* | |
863 | * Finally, set any bits left to be set in one last partial word. | |
864 | */ | |
865 | end_bit = bits_to_set - bits_set; | |
866 | if (end_bit) { | |
867 | mask = (1 << end_bit) - 1; | |
868 | *wordp |= mask; | |
869 | } | |
870 | ||
871 | xfs_buf_item_log_debug(bip, first, last); | |
872 | } | |
873 | ||
874 | ||
875 | /* | |
876 | * Return 1 if the buffer has some data that has been logged (at any | |
877 | * point, not just the current transaction) and 0 if not. | |
878 | */ | |
879 | uint | |
880 | xfs_buf_item_dirty( | |
881 | xfs_buf_log_item_t *bip) | |
882 | { | |
883 | return (bip->bli_flags & XFS_BLI_DIRTY); | |
884 | } | |
885 | ||
886 | /* | |
887 | * This is called when the buf log item is no longer needed. It should | |
888 | * free the buf log item associated with the given buffer and clear | |
889 | * the buffer's pointer to the buf log item. If there are no more | |
890 | * items in the list, clear the b_iodone field of the buffer (see | |
891 | * xfs_buf_attach_iodone() below). | |
892 | */ | |
893 | void | |
894 | xfs_buf_item_relse( | |
895 | xfs_buf_t *bp) | |
896 | { | |
897 | xfs_buf_log_item_t *bip; | |
898 | ||
899 | xfs_buftrace("XFS_RELSE", bp); | |
900 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); | |
901 | XFS_BUF_SET_FSPRIVATE(bp, bip->bli_item.li_bio_list); | |
902 | if ((XFS_BUF_FSPRIVATE(bp, void *) == NULL) && | |
903 | (XFS_BUF_IODONE_FUNC(bp) != NULL)) { | |
904 | ASSERT((XFS_BUF_ISUNINITIAL(bp)) == 0); | |
905 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
906 | } | |
907 | ||
908 | #ifdef XFS_TRANS_DEBUG | |
909 | kmem_free(bip->bli_orig, XFS_BUF_COUNT(bp)); | |
910 | bip->bli_orig = NULL; | |
911 | kmem_free(bip->bli_logged, XFS_BUF_COUNT(bp) / NBBY); | |
912 | bip->bli_logged = NULL; | |
913 | #endif /* XFS_TRANS_DEBUG */ | |
914 | ||
915 | #ifdef XFS_BLI_TRACE | |
916 | ktrace_free(bip->bli_trace); | |
917 | #endif | |
918 | kmem_zone_free(xfs_buf_item_zone, bip); | |
919 | } | |
920 | ||
921 | ||
922 | /* | |
923 | * Add the given log item with its callback to the list of callbacks | |
924 | * to be called when the buffer's I/O completes. If it is not set | |
925 | * already, set the buffer's b_iodone() routine to be | |
926 | * xfs_buf_iodone_callbacks() and link the log item into the list of | |
927 | * items rooted at b_fsprivate. Items are always added as the second | |
928 | * entry in the list if there is a first, because the buf item code | |
929 | * assumes that the buf log item is first. | |
930 | */ | |
931 | void | |
932 | xfs_buf_attach_iodone( | |
933 | xfs_buf_t *bp, | |
934 | void (*cb)(xfs_buf_t *, xfs_log_item_t *), | |
935 | xfs_log_item_t *lip) | |
936 | { | |
937 | xfs_log_item_t *head_lip; | |
938 | ||
939 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
940 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
941 | ||
942 | lip->li_cb = cb; | |
943 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
944 | head_lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
945 | lip->li_bio_list = head_lip->li_bio_list; | |
946 | head_lip->li_bio_list = lip; | |
947 | } else { | |
948 | XFS_BUF_SET_FSPRIVATE(bp, lip); | |
949 | } | |
950 | ||
951 | ASSERT((XFS_BUF_IODONE_FUNC(bp) == xfs_buf_iodone_callbacks) || | |
952 | (XFS_BUF_IODONE_FUNC(bp) == NULL)); | |
953 | XFS_BUF_SET_IODONE_FUNC(bp, xfs_buf_iodone_callbacks); | |
954 | } | |
955 | ||
956 | STATIC void | |
957 | xfs_buf_do_callbacks( | |
958 | xfs_buf_t *bp, | |
959 | xfs_log_item_t *lip) | |
960 | { | |
961 | xfs_log_item_t *nlip; | |
962 | ||
963 | while (lip != NULL) { | |
964 | nlip = lip->li_bio_list; | |
965 | ASSERT(lip->li_cb != NULL); | |
966 | /* | |
967 | * Clear the next pointer so we don't have any | |
968 | * confusion if the item is added to another buf. | |
969 | * Don't touch the log item after calling its | |
970 | * callback, because it could have freed itself. | |
971 | */ | |
972 | lip->li_bio_list = NULL; | |
973 | lip->li_cb(bp, lip); | |
974 | lip = nlip; | |
975 | } | |
976 | } | |
977 | ||
978 | /* | |
979 | * This is the iodone() function for buffers which have had callbacks | |
980 | * attached to them by xfs_buf_attach_iodone(). It should remove each | |
981 | * log item from the buffer's list and call the callback of each in turn. | |
982 | * When done, the buffer's fsprivate field is set to NULL and the buffer | |
983 | * is unlocked with a call to iodone(). | |
984 | */ | |
985 | void | |
986 | xfs_buf_iodone_callbacks( | |
987 | xfs_buf_t *bp) | |
988 | { | |
989 | xfs_log_item_t *lip; | |
990 | static ulong lasttime; | |
991 | static xfs_buftarg_t *lasttarg; | |
992 | xfs_mount_t *mp; | |
993 | ||
994 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
995 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
996 | ||
997 | if (XFS_BUF_GETERROR(bp) != 0) { | |
998 | /* | |
999 | * If we've already decided to shutdown the filesystem | |
1000 | * because of IO errors, there's no point in giving this | |
1001 | * a retry. | |
1002 | */ | |
1003 | mp = lip->li_mountp; | |
1004 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
1005 | ASSERT(XFS_BUF_TARGET(bp) == mp->m_ddev_targp); | |
1006 | XFS_BUF_SUPER_STALE(bp); | |
1007 | xfs_buftrace("BUF_IODONE_CB", bp); | |
1008 | xfs_buf_do_callbacks(bp, lip); | |
1009 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
1010 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1011 | ||
1012 | /* | |
1013 | * XFS_SHUT flag gets set when we go thru the | |
1014 | * entire buffer cache and deliberately start | |
1015 | * throwing away delayed write buffers. | |
1016 | * Since there's no biowait done on those, | |
1017 | * we should just brelse them. | |
1018 | */ | |
1019 | if (XFS_BUF_ISSHUT(bp)) { | |
1020 | XFS_BUF_UNSHUT(bp); | |
1021 | xfs_buf_relse(bp); | |
1022 | } else { | |
1023 | xfs_biodone(bp); | |
1024 | } | |
1025 | ||
1026 | return; | |
1027 | } | |
1028 | ||
1029 | if ((XFS_BUF_TARGET(bp) != lasttarg) || | |
1030 | (time_after(jiffies, (lasttime + 5*HZ)))) { | |
1031 | lasttime = jiffies; | |
b6574520 NS |
1032 | cmn_err(CE_ALERT, "Device %s, XFS metadata write error" |
1033 | " block 0x%llx in %s", | |
1034 | XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp)), | |
1da177e4 LT |
1035 | (__uint64_t)XFS_BUF_ADDR(bp), mp->m_fsname); |
1036 | } | |
1037 | lasttarg = XFS_BUF_TARGET(bp); | |
1038 | ||
1039 | if (XFS_BUF_ISASYNC(bp)) { | |
1040 | /* | |
1041 | * If the write was asynchronous then noone will be | |
1042 | * looking for the error. Clear the error state | |
1043 | * and write the buffer out again delayed write. | |
1044 | * | |
1045 | * XXXsup This is OK, so long as we catch these | |
1046 | * before we start the umount; we don't want these | |
1047 | * DELWRI metadata bufs to be hanging around. | |
1048 | */ | |
1049 | XFS_BUF_ERROR(bp,0); /* errno of 0 unsets the flag */ | |
1050 | ||
1051 | if (!(XFS_BUF_ISSTALE(bp))) { | |
1052 | XFS_BUF_DELAYWRITE(bp); | |
1053 | XFS_BUF_DONE(bp); | |
1054 | XFS_BUF_SET_START(bp); | |
1055 | } | |
1056 | ASSERT(XFS_BUF_IODONE_FUNC(bp)); | |
1057 | xfs_buftrace("BUF_IODONE ASYNC", bp); | |
1058 | xfs_buf_relse(bp); | |
1059 | } else { | |
1060 | /* | |
1061 | * If the write of the buffer was not asynchronous, | |
1062 | * then we want to make sure to return the error | |
1063 | * to the caller of bwrite(). Because of this we | |
1064 | * cannot clear the B_ERROR state at this point. | |
1065 | * Instead we install a callback function that | |
1066 | * will be called when the buffer is released, and | |
1067 | * that routine will clear the error state and | |
1068 | * set the buffer to be written out again after | |
1069 | * some delay. | |
1070 | */ | |
1071 | /* We actually overwrite the existing b-relse | |
1072 | function at times, but we're gonna be shutting down | |
1073 | anyway. */ | |
1074 | XFS_BUF_SET_BRELSE_FUNC(bp,xfs_buf_error_relse); | |
1075 | XFS_BUF_DONE(bp); | |
1076 | XFS_BUF_V_IODONESEMA(bp); | |
1077 | } | |
1078 | return; | |
1079 | } | |
1080 | #ifdef XFSERRORDEBUG | |
1081 | xfs_buftrace("XFS BUFCB NOERR", bp); | |
1082 | #endif | |
1083 | xfs_buf_do_callbacks(bp, lip); | |
1084 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
1085 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1086 | xfs_biodone(bp); | |
1087 | } | |
1088 | ||
1089 | /* | |
1090 | * This is a callback routine attached to a buffer which gets an error | |
1091 | * when being written out synchronously. | |
1092 | */ | |
1093 | STATIC void | |
1094 | xfs_buf_error_relse( | |
1095 | xfs_buf_t *bp) | |
1096 | { | |
1097 | xfs_log_item_t *lip; | |
1098 | xfs_mount_t *mp; | |
1099 | ||
1100 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
1101 | mp = (xfs_mount_t *)lip->li_mountp; | |
1102 | ASSERT(XFS_BUF_TARGET(bp) == mp->m_ddev_targp); | |
1103 | ||
1104 | XFS_BUF_STALE(bp); | |
1105 | XFS_BUF_DONE(bp); | |
1106 | XFS_BUF_UNDELAYWRITE(bp); | |
1107 | XFS_BUF_ERROR(bp,0); | |
1108 | xfs_buftrace("BUF_ERROR_RELSE", bp); | |
1109 | if (! XFS_FORCED_SHUTDOWN(mp)) | |
7d04a335 | 1110 | xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); |
1da177e4 LT |
1111 | /* |
1112 | * We have to unpin the pinned buffers so do the | |
1113 | * callbacks. | |
1114 | */ | |
1115 | xfs_buf_do_callbacks(bp, lip); | |
1116 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
1117 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1118 | XFS_BUF_SET_BRELSE_FUNC(bp,NULL); | |
1119 | xfs_buf_relse(bp); | |
1120 | } | |
1121 | ||
1122 | ||
1123 | /* | |
1124 | * This is the iodone() function for buffers which have been | |
1125 | * logged. It is called when they are eventually flushed out. | |
1126 | * It should remove the buf item from the AIL, and free the buf item. | |
1127 | * It is called by xfs_buf_iodone_callbacks() above which will take | |
1128 | * care of cleaning up the buffer itself. | |
1129 | */ | |
1130 | /* ARGSUSED */ | |
1131 | void | |
1132 | xfs_buf_iodone( | |
1133 | xfs_buf_t *bp, | |
1134 | xfs_buf_log_item_t *bip) | |
1135 | { | |
1136 | struct xfs_mount *mp; | |
1137 | SPLDECL(s); | |
1138 | ||
1139 | ASSERT(bip->bli_buf == bp); | |
1140 | ||
1141 | mp = bip->bli_item.li_mountp; | |
1142 | ||
1143 | /* | |
1144 | * If we are forcibly shutting down, this may well be | |
1145 | * off the AIL already. That's because we simulate the | |
1146 | * log-committed callbacks to unpin these buffers. Or we may never | |
1147 | * have put this item on AIL because of the transaction was | |
1148 | * aborted forcibly. xfs_trans_delete_ail() takes care of these. | |
1149 | * | |
1150 | * Either way, AIL is useless if we're forcing a shutdown. | |
1151 | */ | |
1152 | AIL_LOCK(mp,s); | |
1153 | /* | |
1154 | * xfs_trans_delete_ail() drops the AIL lock. | |
1155 | */ | |
1156 | xfs_trans_delete_ail(mp, (xfs_log_item_t *)bip, s); | |
1157 | ||
1158 | #ifdef XFS_TRANS_DEBUG | |
1159 | kmem_free(bip->bli_orig, XFS_BUF_COUNT(bp)); | |
1160 | bip->bli_orig = NULL; | |
1161 | kmem_free(bip->bli_logged, XFS_BUF_COUNT(bp) / NBBY); | |
1162 | bip->bli_logged = NULL; | |
1163 | #endif /* XFS_TRANS_DEBUG */ | |
1164 | ||
1165 | #ifdef XFS_BLI_TRACE | |
1166 | ktrace_free(bip->bli_trace); | |
1167 | #endif | |
1168 | kmem_zone_free(xfs_buf_item_zone, bip); | |
1169 | } | |
1170 | ||
1171 | #if defined(XFS_BLI_TRACE) | |
1172 | void | |
1173 | xfs_buf_item_trace( | |
1174 | char *id, | |
1175 | xfs_buf_log_item_t *bip) | |
1176 | { | |
1177 | xfs_buf_t *bp; | |
1178 | ASSERT(bip->bli_trace != NULL); | |
1179 | ||
1180 | bp = bip->bli_buf; | |
1181 | ktrace_enter(bip->bli_trace, | |
1182 | (void *)id, | |
1183 | (void *)bip->bli_buf, | |
1184 | (void *)((unsigned long)bip->bli_flags), | |
1185 | (void *)((unsigned long)bip->bli_recur), | |
1186 | (void *)((unsigned long)atomic_read(&bip->bli_refcount)), | |
1187 | (void *)((unsigned long) | |
1188 | (0xFFFFFFFF & XFS_BUF_ADDR(bp) >> 32)), | |
1189 | (void *)((unsigned long)(0xFFFFFFFF & XFS_BUF_ADDR(bp))), | |
1190 | (void *)((unsigned long)XFS_BUF_COUNT(bp)), | |
1191 | (void *)((unsigned long)XFS_BUF_BFLAGS(bp)), | |
1192 | XFS_BUF_FSPRIVATE(bp, void *), | |
1193 | XFS_BUF_FSPRIVATE2(bp, void *), | |
1194 | (void *)(unsigned long)XFS_BUF_ISPINNED(bp), | |
1195 | (void *)XFS_BUF_IODONE_FUNC(bp), | |
1196 | (void *)((unsigned long)(XFS_BUF_VALUSEMA(bp))), | |
1197 | (void *)bip->bli_item.li_desc, | |
1198 | (void *)((unsigned long)bip->bli_item.li_flags)); | |
1199 | } | |
1200 | #endif /* XFS_BLI_TRACE */ |