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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" |
da353b0d | 26 | #include "xfs_ag.h" |
1da177e4 | 27 | #include "xfs_mount.h" |
a844f451 | 28 | #include "xfs_buf_item.h" |
1da177e4 | 29 | #include "xfs_trans_priv.h" |
1da177e4 | 30 | #include "xfs_error.h" |
0b1b213f | 31 | #include "xfs_trace.h" |
1da177e4 LT |
32 | |
33 | ||
34 | kmem_zone_t *xfs_buf_item_zone; | |
35 | ||
36 | #ifdef XFS_TRANS_DEBUG | |
37 | /* | |
38 | * This function uses an alternate strategy for tracking the bytes | |
39 | * that the user requests to be logged. This can then be used | |
40 | * in conjunction with the bli_orig array in the buf log item to | |
41 | * catch bugs in our callers' code. | |
42 | * | |
43 | * We also double check the bits set in xfs_buf_item_log using a | |
44 | * simple algorithm to check that every byte is accounted for. | |
45 | */ | |
46 | STATIC void | |
47 | xfs_buf_item_log_debug( | |
48 | xfs_buf_log_item_t *bip, | |
49 | uint first, | |
50 | uint last) | |
51 | { | |
52 | uint x; | |
53 | uint byte; | |
54 | uint nbytes; | |
55 | uint chunk_num; | |
56 | uint word_num; | |
57 | uint bit_num; | |
58 | uint bit_set; | |
59 | uint *wordp; | |
60 | ||
61 | ASSERT(bip->bli_logged != NULL); | |
62 | byte = first; | |
63 | nbytes = last - first + 1; | |
64 | bfset(bip->bli_logged, first, nbytes); | |
65 | for (x = 0; x < nbytes; x++) { | |
c1155410 | 66 | chunk_num = byte >> XFS_BLF_SHIFT; |
1da177e4 LT |
67 | word_num = chunk_num >> BIT_TO_WORD_SHIFT; |
68 | bit_num = chunk_num & (NBWORD - 1); | |
69 | wordp = &(bip->bli_format.blf_data_map[word_num]); | |
70 | bit_set = *wordp & (1 << bit_num); | |
71 | ASSERT(bit_set); | |
72 | byte++; | |
73 | } | |
74 | } | |
75 | ||
76 | /* | |
77 | * This function is called when we flush something into a buffer without | |
78 | * logging it. This happens for things like inodes which are logged | |
79 | * separately from the buffer. | |
80 | */ | |
81 | void | |
82 | xfs_buf_item_flush_log_debug( | |
83 | xfs_buf_t *bp, | |
84 | uint first, | |
85 | uint last) | |
86 | { | |
87 | xfs_buf_log_item_t *bip; | |
88 | uint nbytes; | |
89 | ||
90 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); | |
91 | if ((bip == NULL) || (bip->bli_item.li_type != XFS_LI_BUF)) { | |
92 | return; | |
93 | } | |
94 | ||
95 | ASSERT(bip->bli_logged != NULL); | |
96 | nbytes = last - first + 1; | |
97 | bfset(bip->bli_logged, first, nbytes); | |
98 | } | |
99 | ||
100 | /* | |
c41564b5 | 101 | * This function is called to verify that our callers have logged |
1da177e4 LT |
102 | * all the bytes that they changed. |
103 | * | |
104 | * It does this by comparing the original copy of the buffer stored in | |
105 | * the buf log item's bli_orig array to the current copy of the buffer | |
c41564b5 | 106 | * and ensuring that all bytes which mismatch are set in the bli_logged |
1da177e4 LT |
107 | * array of the buf log item. |
108 | */ | |
109 | STATIC void | |
110 | xfs_buf_item_log_check( | |
111 | xfs_buf_log_item_t *bip) | |
112 | { | |
113 | char *orig; | |
114 | char *buffer; | |
115 | int x; | |
116 | xfs_buf_t *bp; | |
117 | ||
118 | ASSERT(bip->bli_orig != NULL); | |
119 | ASSERT(bip->bli_logged != NULL); | |
120 | ||
121 | bp = bip->bli_buf; | |
122 | ASSERT(XFS_BUF_COUNT(bp) > 0); | |
123 | ASSERT(XFS_BUF_PTR(bp) != NULL); | |
124 | orig = bip->bli_orig; | |
125 | buffer = XFS_BUF_PTR(bp); | |
126 | for (x = 0; x < XFS_BUF_COUNT(bp); x++) { | |
127 | if (orig[x] != buffer[x] && !btst(bip->bli_logged, x)) | |
128 | cmn_err(CE_PANIC, | |
129 | "xfs_buf_item_log_check bip %x buffer %x orig %x index %d", | |
130 | bip, bp, orig, x); | |
131 | } | |
132 | } | |
133 | #else | |
134 | #define xfs_buf_item_log_debug(x,y,z) | |
135 | #define xfs_buf_item_log_check(x) | |
136 | #endif | |
137 | ||
138 | STATIC void xfs_buf_error_relse(xfs_buf_t *bp); | |
139 | STATIC void xfs_buf_do_callbacks(xfs_buf_t *bp, xfs_log_item_t *lip); | |
140 | ||
141 | /* | |
142 | * This returns the number of log iovecs needed to log the | |
143 | * given buf log item. | |
144 | * | |
145 | * It calculates this as 1 iovec for the buf log format structure | |
146 | * and 1 for each stretch of non-contiguous chunks to be logged. | |
147 | * Contiguous chunks are logged in a single iovec. | |
148 | * | |
149 | * If the XFS_BLI_STALE flag has been set, then log nothing. | |
150 | */ | |
ba0f32d4 | 151 | STATIC uint |
1da177e4 LT |
152 | xfs_buf_item_size( |
153 | xfs_buf_log_item_t *bip) | |
154 | { | |
155 | uint nvecs; | |
156 | int next_bit; | |
157 | int last_bit; | |
158 | xfs_buf_t *bp; | |
159 | ||
160 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
161 | if (bip->bli_flags & XFS_BLI_STALE) { | |
162 | /* | |
163 | * The buffer is stale, so all we need to log | |
164 | * is the buf log format structure with the | |
165 | * cancel flag in it. | |
166 | */ | |
0b1b213f | 167 | trace_xfs_buf_item_size_stale(bip); |
c1155410 | 168 | ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL); |
1da177e4 LT |
169 | return 1; |
170 | } | |
171 | ||
172 | bp = bip->bli_buf; | |
173 | ASSERT(bip->bli_flags & XFS_BLI_LOGGED); | |
174 | nvecs = 1; | |
175 | last_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
176 | bip->bli_format.blf_map_size, 0); | |
177 | ASSERT(last_bit != -1); | |
178 | nvecs++; | |
179 | while (last_bit != -1) { | |
180 | /* | |
181 | * This takes the bit number to start looking from and | |
182 | * returns the next set bit from there. It returns -1 | |
183 | * if there are no more bits set or the start bit is | |
184 | * beyond the end of the bitmap. | |
185 | */ | |
186 | next_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
187 | bip->bli_format.blf_map_size, | |
188 | last_bit + 1); | |
189 | /* | |
190 | * If we run out of bits, leave the loop, | |
191 | * else if we find a new set of bits bump the number of vecs, | |
192 | * else keep scanning the current set of bits. | |
193 | */ | |
194 | if (next_bit == -1) { | |
195 | last_bit = -1; | |
196 | } else if (next_bit != last_bit + 1) { | |
197 | last_bit = next_bit; | |
198 | nvecs++; | |
c1155410 DC |
199 | } else if (xfs_buf_offset(bp, next_bit * XFS_BLF_CHUNK) != |
200 | (xfs_buf_offset(bp, last_bit * XFS_BLF_CHUNK) + | |
201 | XFS_BLF_CHUNK)) { | |
1da177e4 LT |
202 | last_bit = next_bit; |
203 | nvecs++; | |
204 | } else { | |
205 | last_bit++; | |
206 | } | |
207 | } | |
208 | ||
0b1b213f | 209 | trace_xfs_buf_item_size(bip); |
1da177e4 LT |
210 | return nvecs; |
211 | } | |
212 | ||
213 | /* | |
214 | * This is called to fill in the vector of log iovecs for the | |
215 | * given log buf item. It fills the first entry with a buf log | |
216 | * format structure, and the rest point to contiguous chunks | |
217 | * within the buffer. | |
218 | */ | |
ba0f32d4 | 219 | STATIC void |
1da177e4 LT |
220 | xfs_buf_item_format( |
221 | xfs_buf_log_item_t *bip, | |
222 | xfs_log_iovec_t *log_vector) | |
223 | { | |
224 | uint base_size; | |
225 | uint nvecs; | |
226 | xfs_log_iovec_t *vecp; | |
227 | xfs_buf_t *bp; | |
228 | int first_bit; | |
229 | int last_bit; | |
230 | int next_bit; | |
231 | uint nbits; | |
232 | uint buffer_offset; | |
233 | ||
234 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
235 | ASSERT((bip->bli_flags & XFS_BLI_LOGGED) || | |
236 | (bip->bli_flags & XFS_BLI_STALE)); | |
237 | bp = bip->bli_buf; | |
1da177e4 LT |
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; | |
4139b3b3 | 252 | vecp->i_type = XLOG_REG_TYPE_BFORMAT; |
1da177e4 LT |
253 | vecp++; |
254 | nvecs = 1; | |
255 | ||
ccf7c23f DC |
256 | /* |
257 | * If it is an inode buffer, transfer the in-memory state to the | |
258 | * format flags and clear the in-memory state. We do not transfer | |
259 | * this state if the inode buffer allocation has not yet been committed | |
260 | * to the log as setting the XFS_BLI_INODE_BUF flag will prevent | |
261 | * correct replay of the inode allocation. | |
262 | */ | |
263 | if (bip->bli_flags & XFS_BLI_INODE_BUF) { | |
264 | if (!((bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF) && | |
265 | xfs_log_item_in_current_chkpt(&bip->bli_item))) | |
266 | bip->bli_format.blf_flags |= XFS_BLF_INODE_BUF; | |
267 | bip->bli_flags &= ~XFS_BLI_INODE_BUF; | |
268 | } | |
269 | ||
1da177e4 LT |
270 | if (bip->bli_flags & XFS_BLI_STALE) { |
271 | /* | |
272 | * The buffer is stale, so all we need to log | |
273 | * is the buf log format structure with the | |
274 | * cancel flag in it. | |
275 | */ | |
0b1b213f | 276 | trace_xfs_buf_item_format_stale(bip); |
c1155410 | 277 | ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL); |
1da177e4 LT |
278 | bip->bli_format.blf_size = nvecs; |
279 | return; | |
280 | } | |
281 | ||
282 | /* | |
283 | * Fill in an iovec for each set of contiguous chunks. | |
284 | */ | |
285 | first_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
286 | bip->bli_format.blf_map_size, 0); | |
287 | ASSERT(first_bit != -1); | |
288 | last_bit = first_bit; | |
289 | nbits = 1; | |
290 | for (;;) { | |
291 | /* | |
292 | * This takes the bit number to start looking from and | |
293 | * returns the next set bit from there. It returns -1 | |
294 | * if there are no more bits set or the start bit is | |
295 | * beyond the end of the bitmap. | |
296 | */ | |
297 | next_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
298 | bip->bli_format.blf_map_size, | |
299 | (uint)last_bit + 1); | |
300 | /* | |
301 | * If we run out of bits fill in the last iovec and get | |
302 | * out of the loop. | |
303 | * Else if we start a new set of bits then fill in the | |
304 | * iovec for the series we were looking at and start | |
305 | * counting the bits in the new one. | |
306 | * Else we're still in the same set of bits so just | |
307 | * keep counting and scanning. | |
308 | */ | |
309 | if (next_bit == -1) { | |
c1155410 | 310 | buffer_offset = first_bit * XFS_BLF_CHUNK; |
1da177e4 | 311 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); |
c1155410 | 312 | vecp->i_len = nbits * XFS_BLF_CHUNK; |
4139b3b3 | 313 | vecp->i_type = XLOG_REG_TYPE_BCHUNK; |
1da177e4 LT |
314 | nvecs++; |
315 | break; | |
316 | } else if (next_bit != last_bit + 1) { | |
c1155410 | 317 | buffer_offset = first_bit * XFS_BLF_CHUNK; |
1da177e4 | 318 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); |
c1155410 | 319 | vecp->i_len = nbits * XFS_BLF_CHUNK; |
4139b3b3 | 320 | vecp->i_type = XLOG_REG_TYPE_BCHUNK; |
1da177e4 LT |
321 | nvecs++; |
322 | vecp++; | |
323 | first_bit = next_bit; | |
324 | last_bit = next_bit; | |
325 | nbits = 1; | |
c1155410 DC |
326 | } else if (xfs_buf_offset(bp, next_bit << XFS_BLF_SHIFT) != |
327 | (xfs_buf_offset(bp, last_bit << XFS_BLF_SHIFT) + | |
328 | XFS_BLF_CHUNK)) { | |
329 | buffer_offset = first_bit * XFS_BLF_CHUNK; | |
1da177e4 | 330 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); |
c1155410 | 331 | vecp->i_len = nbits * XFS_BLF_CHUNK; |
4139b3b3 | 332 | vecp->i_type = XLOG_REG_TYPE_BCHUNK; |
1da177e4 LT |
333 | /* You would think we need to bump the nvecs here too, but we do not |
334 | * this number is used by recovery, and it gets confused by the boundary | |
335 | * split here | |
336 | * nvecs++; | |
337 | */ | |
338 | vecp++; | |
339 | first_bit = next_bit; | |
340 | last_bit = next_bit; | |
341 | nbits = 1; | |
342 | } else { | |
343 | last_bit++; | |
344 | nbits++; | |
345 | } | |
346 | } | |
347 | bip->bli_format.blf_size = nvecs; | |
348 | ||
349 | /* | |
350 | * Check to make sure everything is consistent. | |
351 | */ | |
0b1b213f | 352 | trace_xfs_buf_item_format(bip); |
1da177e4 LT |
353 | xfs_buf_item_log_check(bip); |
354 | } | |
355 | ||
356 | /* | |
64fc35de DC |
357 | * This is called to pin the buffer associated with the buf log item in memory |
358 | * so it cannot be written out. Simply call bpin() on the buffer to do this. | |
359 | * | |
360 | * We also always take a reference to the buffer log item here so that the bli | |
361 | * is held while the item is pinned in memory. This means that we can | |
362 | * unconditionally drop the reference count a transaction holds when the | |
363 | * transaction is completed. | |
1da177e4 | 364 | */ |
64fc35de | 365 | |
ba0f32d4 | 366 | STATIC void |
1da177e4 LT |
367 | xfs_buf_item_pin( |
368 | xfs_buf_log_item_t *bip) | |
369 | { | |
370 | xfs_buf_t *bp; | |
371 | ||
372 | bp = bip->bli_buf; | |
373 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
374 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
375 | ASSERT((bip->bli_flags & XFS_BLI_LOGGED) || | |
376 | (bip->bli_flags & XFS_BLI_STALE)); | |
64fc35de | 377 | atomic_inc(&bip->bli_refcount); |
0b1b213f | 378 | trace_xfs_buf_item_pin(bip); |
1da177e4 LT |
379 | xfs_bpin(bp); |
380 | } | |
381 | ||
382 | ||
383 | /* | |
384 | * This is called to unpin the buffer associated with the buf log | |
385 | * item which was previously pinned with a call to xfs_buf_item_pin(). | |
386 | * Just call bunpin() on the buffer to do this. | |
387 | * | |
388 | * Also drop the reference to the buf item for the current transaction. | |
389 | * If the XFS_BLI_STALE flag is set and we are the last reference, | |
390 | * then free up the buf log item and unlock the buffer. | |
391 | */ | |
ba0f32d4 | 392 | STATIC void |
1da177e4 | 393 | xfs_buf_item_unpin( |
8e123850 | 394 | xfs_buf_log_item_t *bip) |
1da177e4 | 395 | { |
783a2f65 | 396 | struct xfs_ail *ailp; |
1da177e4 LT |
397 | xfs_buf_t *bp; |
398 | int freed; | |
8e123850 | 399 | int stale = bip->bli_flags & XFS_BLI_STALE; |
1da177e4 LT |
400 | |
401 | bp = bip->bli_buf; | |
402 | ASSERT(bp != NULL); | |
403 | ASSERT(XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *) == bip); | |
404 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
0b1b213f | 405 | trace_xfs_buf_item_unpin(bip); |
1da177e4 LT |
406 | |
407 | freed = atomic_dec_and_test(&bip->bli_refcount); | |
783a2f65 | 408 | ailp = bip->bli_item.li_ailp; |
1da177e4 LT |
409 | xfs_bunpin(bp); |
410 | if (freed && stale) { | |
411 | ASSERT(bip->bli_flags & XFS_BLI_STALE); | |
412 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
413 | ASSERT(!(XFS_BUF_ISDELAYWRITE(bp))); | |
414 | ASSERT(XFS_BUF_ISSTALE(bp)); | |
c1155410 | 415 | ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL); |
0b1b213f CH |
416 | trace_xfs_buf_item_unpin_stale(bip); |
417 | ||
1da177e4 LT |
418 | /* |
419 | * If we get called here because of an IO error, we may | |
783a2f65 | 420 | * or may not have the item on the AIL. xfs_trans_ail_delete() |
1da177e4 | 421 | * will take care of that situation. |
783a2f65 | 422 | * xfs_trans_ail_delete() drops the AIL lock. |
1da177e4 LT |
423 | */ |
424 | if (bip->bli_flags & XFS_BLI_STALE_INODE) { | |
425 | xfs_buf_do_callbacks(bp, (xfs_log_item_t *)bip); | |
426 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
427 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
428 | } else { | |
783a2f65 DC |
429 | spin_lock(&ailp->xa_lock); |
430 | xfs_trans_ail_delete(ailp, (xfs_log_item_t *)bip); | |
1da177e4 LT |
431 | xfs_buf_item_relse(bp); |
432 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) == NULL); | |
433 | } | |
434 | xfs_buf_relse(bp); | |
435 | } | |
436 | } | |
437 | ||
438 | /* | |
439 | * this is called from uncommit in the forced-shutdown path. | |
440 | * we need to check to see if the reference count on the log item | |
441 | * is going to drop to zero. If so, unpin will free the log item | |
442 | * so we need to free the item's descriptor (that points to the item) | |
443 | * in the transaction. | |
444 | */ | |
ba0f32d4 | 445 | STATIC void |
1da177e4 LT |
446 | xfs_buf_item_unpin_remove( |
447 | xfs_buf_log_item_t *bip, | |
448 | xfs_trans_t *tp) | |
449 | { | |
8e123850 | 450 | /* will xfs_buf_item_unpin() call xfs_buf_item_relse()? */ |
1da177e4 LT |
451 | if ((atomic_read(&bip->bli_refcount) == 1) && |
452 | (bip->bli_flags & XFS_BLI_STALE)) { | |
8e123850 DC |
453 | /* |
454 | * yes -- We can safely do some work here and then call | |
455 | * buf_item_unpin to do the rest because we are | |
456 | * are holding the buffer locked so no one else will be | |
457 | * able to bump up the refcount. We have to remove the | |
458 | * log item from the transaction as we are about to release | |
459 | * our reference to the buffer. If we don't, the unlock that | |
460 | * occurs later in the xfs_trans_uncommit() will try to | |
461 | * reference the buffer which we no longer have a hold on. | |
462 | */ | |
1da177e4 | 463 | ASSERT(XFS_BUF_VALUSEMA(bip->bli_buf) <= 0); |
0b1b213f CH |
464 | trace_xfs_buf_item_unpin_stale(bip); |
465 | ||
e98c414f | 466 | xfs_trans_del_item(&bip->bli_item); |
8e123850 | 467 | |
1da177e4 | 468 | /* |
8e123850 DC |
469 | * Since the transaction no longer refers to the buffer, the |
470 | * buffer should no longer refer to the transaction. | |
1da177e4 | 471 | */ |
8e123850 | 472 | XFS_BUF_SET_FSPRIVATE2(bip->bli_buf, NULL); |
1da177e4 | 473 | } |
8e123850 | 474 | xfs_buf_item_unpin(bip); |
1da177e4 LT |
475 | } |
476 | ||
477 | /* | |
478 | * This is called to attempt to lock the buffer associated with this | |
479 | * buf log item. Don't sleep on the buffer lock. If we can't get | |
d808f617 DC |
480 | * the lock right away, return 0. If we can get the lock, take a |
481 | * reference to the buffer. If this is a delayed write buffer that | |
482 | * needs AIL help to be written back, invoke the pushbuf routine | |
483 | * rather than the normal success path. | |
1da177e4 | 484 | */ |
ba0f32d4 | 485 | STATIC uint |
1da177e4 LT |
486 | xfs_buf_item_trylock( |
487 | xfs_buf_log_item_t *bip) | |
488 | { | |
489 | xfs_buf_t *bp; | |
490 | ||
491 | bp = bip->bli_buf; | |
d808f617 | 492 | if (XFS_BUF_ISPINNED(bp)) |
1da177e4 | 493 | return XFS_ITEM_PINNED; |
d808f617 | 494 | if (!XFS_BUF_CPSEMA(bp)) |
1da177e4 | 495 | return XFS_ITEM_LOCKED; |
1da177e4 | 496 | |
d808f617 | 497 | /* take a reference to the buffer. */ |
1da177e4 LT |
498 | XFS_BUF_HOLD(bp); |
499 | ||
500 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
0b1b213f | 501 | trace_xfs_buf_item_trylock(bip); |
d808f617 DC |
502 | if (XFS_BUF_ISDELAYWRITE(bp)) |
503 | return XFS_ITEM_PUSHBUF; | |
1da177e4 LT |
504 | return XFS_ITEM_SUCCESS; |
505 | } | |
506 | ||
507 | /* | |
64fc35de DC |
508 | * Release the buffer associated with the buf log item. If there is no dirty |
509 | * logged data associated with the buffer recorded in the buf log item, then | |
510 | * free the buf log item and remove the reference to it in the buffer. | |
1da177e4 | 511 | * |
64fc35de DC |
512 | * This call ignores the recursion count. It is only called when the buffer |
513 | * should REALLY be unlocked, regardless of the recursion count. | |
1da177e4 | 514 | * |
64fc35de DC |
515 | * We unconditionally drop the transaction's reference to the log item. If the |
516 | * item was logged, then another reference was taken when it was pinned, so we | |
517 | * can safely drop the transaction reference now. This also allows us to avoid | |
518 | * potential races with the unpin code freeing the bli by not referencing the | |
519 | * bli after we've dropped the reference count. | |
520 | * | |
521 | * If the XFS_BLI_HOLD flag is set in the buf log item, then free the log item | |
522 | * if necessary but do not unlock the buffer. This is for support of | |
523 | * xfs_trans_bhold(). Make sure the XFS_BLI_HOLD field is cleared if we don't | |
524 | * free the item. | |
1da177e4 | 525 | */ |
ba0f32d4 | 526 | STATIC void |
1da177e4 LT |
527 | xfs_buf_item_unlock( |
528 | xfs_buf_log_item_t *bip) | |
529 | { | |
530 | int aborted; | |
531 | xfs_buf_t *bp; | |
532 | uint hold; | |
533 | ||
534 | bp = bip->bli_buf; | |
1da177e4 | 535 | |
64fc35de | 536 | /* Clear the buffer's association with this transaction. */ |
1da177e4 LT |
537 | XFS_BUF_SET_FSPRIVATE2(bp, NULL); |
538 | ||
539 | /* | |
64fc35de DC |
540 | * If this is a transaction abort, don't return early. Instead, allow |
541 | * the brelse to happen. Normally it would be done for stale | |
542 | * (cancelled) buffers at unpin time, but we'll never go through the | |
543 | * pin/unpin cycle if we abort inside commit. | |
1da177e4 LT |
544 | */ |
545 | aborted = (bip->bli_item.li_flags & XFS_LI_ABORTED) != 0; | |
546 | ||
547 | /* | |
64fc35de DC |
548 | * Before possibly freeing the buf item, determine if we should |
549 | * release the buffer at the end of this routine. | |
550 | */ | |
551 | hold = bip->bli_flags & XFS_BLI_HOLD; | |
552 | ||
553 | /* Clear the per transaction state. */ | |
554 | bip->bli_flags &= ~(XFS_BLI_LOGGED | XFS_BLI_HOLD); | |
555 | ||
556 | /* | |
557 | * If the buf item is marked stale, then don't do anything. We'll | |
558 | * unlock the buffer and free the buf item when the buffer is unpinned | |
559 | * for the last time. | |
1da177e4 LT |
560 | */ |
561 | if (bip->bli_flags & XFS_BLI_STALE) { | |
0b1b213f | 562 | trace_xfs_buf_item_unlock_stale(bip); |
c1155410 | 563 | ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL); |
64fc35de DC |
564 | if (!aborted) { |
565 | atomic_dec(&bip->bli_refcount); | |
1da177e4 | 566 | return; |
64fc35de | 567 | } |
1da177e4 LT |
568 | } |
569 | ||
0b1b213f | 570 | trace_xfs_buf_item_unlock(bip); |
1da177e4 LT |
571 | |
572 | /* | |
64fc35de DC |
573 | * If the buf item isn't tracking any data, free it, otherwise drop the |
574 | * reference we hold to it. | |
1da177e4 | 575 | */ |
24ad33ff | 576 | if (xfs_bitmap_empty(bip->bli_format.blf_data_map, |
64fc35de | 577 | bip->bli_format.blf_map_size)) |
1da177e4 | 578 | xfs_buf_item_relse(bp); |
64fc35de DC |
579 | else |
580 | atomic_dec(&bip->bli_refcount); | |
1da177e4 | 581 | |
64fc35de | 582 | if (!hold) |
1da177e4 | 583 | xfs_buf_relse(bp); |
1da177e4 LT |
584 | } |
585 | ||
586 | /* | |
587 | * This is called to find out where the oldest active copy of the | |
588 | * buf log item in the on disk log resides now that the last log | |
589 | * write of it completed at the given lsn. | |
590 | * We always re-log all the dirty data in a buffer, so usually the | |
591 | * latest copy in the on disk log is the only one that matters. For | |
592 | * those cases we simply return the given lsn. | |
593 | * | |
594 | * The one exception to this is for buffers full of newly allocated | |
595 | * inodes. These buffers are only relogged with the XFS_BLI_INODE_BUF | |
596 | * flag set, indicating that only the di_next_unlinked fields from the | |
597 | * inodes in the buffers will be replayed during recovery. If the | |
598 | * original newly allocated inode images have not yet been flushed | |
599 | * when the buffer is so relogged, then we need to make sure that we | |
600 | * keep the old images in the 'active' portion of the log. We do this | |
601 | * by returning the original lsn of that transaction here rather than | |
602 | * the current one. | |
603 | */ | |
ba0f32d4 | 604 | STATIC xfs_lsn_t |
1da177e4 LT |
605 | xfs_buf_item_committed( |
606 | xfs_buf_log_item_t *bip, | |
607 | xfs_lsn_t lsn) | |
608 | { | |
0b1b213f CH |
609 | trace_xfs_buf_item_committed(bip); |
610 | ||
1da177e4 LT |
611 | if ((bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF) && |
612 | (bip->bli_item.li_lsn != 0)) { | |
613 | return bip->bli_item.li_lsn; | |
614 | } | |
615 | return (lsn); | |
616 | } | |
617 | ||
1da177e4 | 618 | /* |
d808f617 DC |
619 | * The buffer is locked, but is not a delayed write buffer. This happens |
620 | * if we race with IO completion and hence we don't want to try to write it | |
621 | * again. Just release the buffer. | |
1da177e4 | 622 | */ |
ba0f32d4 | 623 | STATIC void |
1da177e4 LT |
624 | xfs_buf_item_push( |
625 | xfs_buf_log_item_t *bip) | |
626 | { | |
627 | xfs_buf_t *bp; | |
628 | ||
629 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
0b1b213f | 630 | trace_xfs_buf_item_push(bip); |
1da177e4 LT |
631 | |
632 | bp = bip->bli_buf; | |
d808f617 DC |
633 | ASSERT(!XFS_BUF_ISDELAYWRITE(bp)); |
634 | xfs_buf_relse(bp); | |
635 | } | |
1da177e4 | 636 | |
d808f617 DC |
637 | /* |
638 | * The buffer is locked and is a delayed write buffer. Promote the buffer | |
639 | * in the delayed write queue as the caller knows that they must invoke | |
640 | * the xfsbufd to get this buffer written. We have to unlock the buffer | |
641 | * to allow the xfsbufd to write it, too. | |
642 | */ | |
643 | STATIC void | |
644 | xfs_buf_item_pushbuf( | |
645 | xfs_buf_log_item_t *bip) | |
646 | { | |
647 | xfs_buf_t *bp; | |
648 | ||
649 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
650 | trace_xfs_buf_item_pushbuf(bip); | |
651 | ||
652 | bp = bip->bli_buf; | |
653 | ASSERT(XFS_BUF_ISDELAYWRITE(bp)); | |
654 | xfs_buf_delwri_promote(bp); | |
655 | xfs_buf_relse(bp); | |
1da177e4 LT |
656 | } |
657 | ||
658 | /* ARGSUSED */ | |
ba0f32d4 | 659 | STATIC void |
1da177e4 LT |
660 | xfs_buf_item_committing(xfs_buf_log_item_t *bip, xfs_lsn_t commit_lsn) |
661 | { | |
662 | } | |
663 | ||
664 | /* | |
665 | * This is the ops vector shared by all buf log items. | |
666 | */ | |
7989cb8e | 667 | static struct xfs_item_ops xfs_buf_item_ops = { |
1da177e4 LT |
668 | .iop_size = (uint(*)(xfs_log_item_t*))xfs_buf_item_size, |
669 | .iop_format = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*)) | |
670 | xfs_buf_item_format, | |
671 | .iop_pin = (void(*)(xfs_log_item_t*))xfs_buf_item_pin, | |
8e123850 | 672 | .iop_unpin = (void(*)(xfs_log_item_t*))xfs_buf_item_unpin, |
1da177e4 LT |
673 | .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t *)) |
674 | xfs_buf_item_unpin_remove, | |
675 | .iop_trylock = (uint(*)(xfs_log_item_t*))xfs_buf_item_trylock, | |
676 | .iop_unlock = (void(*)(xfs_log_item_t*))xfs_buf_item_unlock, | |
677 | .iop_committed = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t)) | |
678 | xfs_buf_item_committed, | |
679 | .iop_push = (void(*)(xfs_log_item_t*))xfs_buf_item_push, | |
d808f617 | 680 | .iop_pushbuf = (void(*)(xfs_log_item_t*))xfs_buf_item_pushbuf, |
1da177e4 LT |
681 | .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t)) |
682 | xfs_buf_item_committing | |
683 | }; | |
684 | ||
685 | ||
686 | /* | |
687 | * Allocate a new buf log item to go with the given buffer. | |
688 | * Set the buffer's b_fsprivate field to point to the new | |
689 | * buf log item. If there are other item's attached to the | |
690 | * buffer (see xfs_buf_attach_iodone() below), then put the | |
691 | * buf log item at the front. | |
692 | */ | |
693 | void | |
694 | xfs_buf_item_init( | |
695 | xfs_buf_t *bp, | |
696 | xfs_mount_t *mp) | |
697 | { | |
698 | xfs_log_item_t *lip; | |
699 | xfs_buf_log_item_t *bip; | |
700 | int chunks; | |
701 | int map_size; | |
702 | ||
703 | /* | |
704 | * Check to see if there is already a buf log item for | |
705 | * this buffer. If there is, it is guaranteed to be | |
706 | * the first. If we do already have one, there is | |
707 | * nothing to do here so return. | |
708 | */ | |
15ac08a8 CH |
709 | if (bp->b_mount != mp) |
710 | bp->b_mount = mp; | |
1da177e4 LT |
711 | XFS_BUF_SET_BDSTRAT_FUNC(bp, xfs_bdstrat_cb); |
712 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
713 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
714 | if (lip->li_type == XFS_LI_BUF) { | |
715 | return; | |
716 | } | |
717 | } | |
718 | ||
719 | /* | |
c1155410 | 720 | * chunks is the number of XFS_BLF_CHUNK size pieces |
1da177e4 LT |
721 | * the buffer can be divided into. Make sure not to |
722 | * truncate any pieces. map_size is the size of the | |
723 | * bitmap needed to describe the chunks of the buffer. | |
724 | */ | |
c1155410 | 725 | chunks = (int)((XFS_BUF_COUNT(bp) + (XFS_BLF_CHUNK - 1)) >> XFS_BLF_SHIFT); |
1da177e4 LT |
726 | map_size = (int)((chunks + NBWORD) >> BIT_TO_WORD_SHIFT); |
727 | ||
728 | bip = (xfs_buf_log_item_t*)kmem_zone_zalloc(xfs_buf_item_zone, | |
729 | KM_SLEEP); | |
43f5efc5 | 730 | xfs_log_item_init(mp, &bip->bli_item, XFS_LI_BUF, &xfs_buf_item_ops); |
1da177e4 | 731 | bip->bli_buf = bp; |
e1f5dbd7 | 732 | xfs_buf_hold(bp); |
1da177e4 LT |
733 | bip->bli_format.blf_type = XFS_LI_BUF; |
734 | bip->bli_format.blf_blkno = (__int64_t)XFS_BUF_ADDR(bp); | |
735 | bip->bli_format.blf_len = (ushort)BTOBB(XFS_BUF_COUNT(bp)); | |
736 | bip->bli_format.blf_map_size = map_size; | |
1da177e4 LT |
737 | |
738 | #ifdef XFS_TRANS_DEBUG | |
739 | /* | |
740 | * Allocate the arrays for tracking what needs to be logged | |
741 | * and what our callers request to be logged. bli_orig | |
742 | * holds a copy of the original, clean buffer for comparison | |
743 | * against, and bli_logged keeps a 1 bit flag per byte in | |
744 | * the buffer to indicate which bytes the callers have asked | |
745 | * to have logged. | |
746 | */ | |
747 | bip->bli_orig = (char *)kmem_alloc(XFS_BUF_COUNT(bp), KM_SLEEP); | |
748 | memcpy(bip->bli_orig, XFS_BUF_PTR(bp), XFS_BUF_COUNT(bp)); | |
749 | bip->bli_logged = (char *)kmem_zalloc(XFS_BUF_COUNT(bp) / NBBY, KM_SLEEP); | |
750 | #endif | |
751 | ||
752 | /* | |
753 | * Put the buf item into the list of items attached to the | |
754 | * buffer at the front. | |
755 | */ | |
756 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
757 | bip->bli_item.li_bio_list = | |
758 | XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
759 | } | |
760 | XFS_BUF_SET_FSPRIVATE(bp, bip); | |
761 | } | |
762 | ||
763 | ||
764 | /* | |
765 | * Mark bytes first through last inclusive as dirty in the buf | |
766 | * item's bitmap. | |
767 | */ | |
768 | void | |
769 | xfs_buf_item_log( | |
770 | xfs_buf_log_item_t *bip, | |
771 | uint first, | |
772 | uint last) | |
773 | { | |
774 | uint first_bit; | |
775 | uint last_bit; | |
776 | uint bits_to_set; | |
777 | uint bits_set; | |
778 | uint word_num; | |
779 | uint *wordp; | |
780 | uint bit; | |
781 | uint end_bit; | |
782 | uint mask; | |
783 | ||
784 | /* | |
785 | * Mark the item as having some dirty data for | |
786 | * quick reference in xfs_buf_item_dirty. | |
787 | */ | |
788 | bip->bli_flags |= XFS_BLI_DIRTY; | |
789 | ||
790 | /* | |
791 | * Convert byte offsets to bit numbers. | |
792 | */ | |
c1155410 DC |
793 | first_bit = first >> XFS_BLF_SHIFT; |
794 | last_bit = last >> XFS_BLF_SHIFT; | |
1da177e4 LT |
795 | |
796 | /* | |
797 | * Calculate the total number of bits to be set. | |
798 | */ | |
799 | bits_to_set = last_bit - first_bit + 1; | |
800 | ||
801 | /* | |
802 | * Get a pointer to the first word in the bitmap | |
803 | * to set a bit in. | |
804 | */ | |
805 | word_num = first_bit >> BIT_TO_WORD_SHIFT; | |
806 | wordp = &(bip->bli_format.blf_data_map[word_num]); | |
807 | ||
808 | /* | |
809 | * Calculate the starting bit in the first word. | |
810 | */ | |
811 | bit = first_bit & (uint)(NBWORD - 1); | |
812 | ||
813 | /* | |
814 | * First set any bits in the first word of our range. | |
815 | * If it starts at bit 0 of the word, it will be | |
816 | * set below rather than here. That is what the variable | |
817 | * bit tells us. The variable bits_set tracks the number | |
818 | * of bits that have been set so far. End_bit is the number | |
819 | * of the last bit to be set in this word plus one. | |
820 | */ | |
821 | if (bit) { | |
822 | end_bit = MIN(bit + bits_to_set, (uint)NBWORD); | |
823 | mask = ((1 << (end_bit - bit)) - 1) << bit; | |
824 | *wordp |= mask; | |
825 | wordp++; | |
826 | bits_set = end_bit - bit; | |
827 | } else { | |
828 | bits_set = 0; | |
829 | } | |
830 | ||
831 | /* | |
832 | * Now set bits a whole word at a time that are between | |
833 | * first_bit and last_bit. | |
834 | */ | |
835 | while ((bits_to_set - bits_set) >= NBWORD) { | |
836 | *wordp |= 0xffffffff; | |
837 | bits_set += NBWORD; | |
838 | wordp++; | |
839 | } | |
840 | ||
841 | /* | |
842 | * Finally, set any bits left to be set in one last partial word. | |
843 | */ | |
844 | end_bit = bits_to_set - bits_set; | |
845 | if (end_bit) { | |
846 | mask = (1 << end_bit) - 1; | |
847 | *wordp |= mask; | |
848 | } | |
849 | ||
850 | xfs_buf_item_log_debug(bip, first, last); | |
851 | } | |
852 | ||
853 | ||
854 | /* | |
855 | * Return 1 if the buffer has some data that has been logged (at any | |
856 | * point, not just the current transaction) and 0 if not. | |
857 | */ | |
858 | uint | |
859 | xfs_buf_item_dirty( | |
860 | xfs_buf_log_item_t *bip) | |
861 | { | |
862 | return (bip->bli_flags & XFS_BLI_DIRTY); | |
863 | } | |
864 | ||
e1f5dbd7 LM |
865 | STATIC void |
866 | xfs_buf_item_free( | |
867 | xfs_buf_log_item_t *bip) | |
868 | { | |
869 | #ifdef XFS_TRANS_DEBUG | |
870 | kmem_free(bip->bli_orig); | |
871 | kmem_free(bip->bli_logged); | |
872 | #endif /* XFS_TRANS_DEBUG */ | |
873 | ||
e1f5dbd7 LM |
874 | kmem_zone_free(xfs_buf_item_zone, bip); |
875 | } | |
876 | ||
1da177e4 LT |
877 | /* |
878 | * This is called when the buf log item is no longer needed. It should | |
879 | * free the buf log item associated with the given buffer and clear | |
880 | * the buffer's pointer to the buf log item. If there are no more | |
881 | * items in the list, clear the b_iodone field of the buffer (see | |
882 | * xfs_buf_attach_iodone() below). | |
883 | */ | |
884 | void | |
885 | xfs_buf_item_relse( | |
886 | xfs_buf_t *bp) | |
887 | { | |
888 | xfs_buf_log_item_t *bip; | |
889 | ||
0b1b213f CH |
890 | trace_xfs_buf_item_relse(bp, _RET_IP_); |
891 | ||
1da177e4 LT |
892 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); |
893 | XFS_BUF_SET_FSPRIVATE(bp, bip->bli_item.li_bio_list); | |
894 | if ((XFS_BUF_FSPRIVATE(bp, void *) == NULL) && | |
895 | (XFS_BUF_IODONE_FUNC(bp) != NULL)) { | |
1da177e4 LT |
896 | XFS_BUF_CLR_IODONE_FUNC(bp); |
897 | } | |
e1f5dbd7 LM |
898 | xfs_buf_rele(bp); |
899 | xfs_buf_item_free(bip); | |
1da177e4 LT |
900 | } |
901 | ||
902 | ||
903 | /* | |
904 | * Add the given log item with its callback to the list of callbacks | |
905 | * to be called when the buffer's I/O completes. If it is not set | |
906 | * already, set the buffer's b_iodone() routine to be | |
907 | * xfs_buf_iodone_callbacks() and link the log item into the list of | |
908 | * items rooted at b_fsprivate. Items are always added as the second | |
909 | * entry in the list if there is a first, because the buf item code | |
910 | * assumes that the buf log item is first. | |
911 | */ | |
912 | void | |
913 | xfs_buf_attach_iodone( | |
914 | xfs_buf_t *bp, | |
915 | void (*cb)(xfs_buf_t *, xfs_log_item_t *), | |
916 | xfs_log_item_t *lip) | |
917 | { | |
918 | xfs_log_item_t *head_lip; | |
919 | ||
920 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
921 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
922 | ||
923 | lip->li_cb = cb; | |
924 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
925 | head_lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
926 | lip->li_bio_list = head_lip->li_bio_list; | |
927 | head_lip->li_bio_list = lip; | |
928 | } else { | |
929 | XFS_BUF_SET_FSPRIVATE(bp, lip); | |
930 | } | |
931 | ||
932 | ASSERT((XFS_BUF_IODONE_FUNC(bp) == xfs_buf_iodone_callbacks) || | |
933 | (XFS_BUF_IODONE_FUNC(bp) == NULL)); | |
934 | XFS_BUF_SET_IODONE_FUNC(bp, xfs_buf_iodone_callbacks); | |
935 | } | |
936 | ||
937 | STATIC void | |
938 | xfs_buf_do_callbacks( | |
939 | xfs_buf_t *bp, | |
940 | xfs_log_item_t *lip) | |
941 | { | |
942 | xfs_log_item_t *nlip; | |
943 | ||
944 | while (lip != NULL) { | |
945 | nlip = lip->li_bio_list; | |
946 | ASSERT(lip->li_cb != NULL); | |
947 | /* | |
948 | * Clear the next pointer so we don't have any | |
949 | * confusion if the item is added to another buf. | |
950 | * Don't touch the log item after calling its | |
951 | * callback, because it could have freed itself. | |
952 | */ | |
953 | lip->li_bio_list = NULL; | |
954 | lip->li_cb(bp, lip); | |
955 | lip = nlip; | |
956 | } | |
957 | } | |
958 | ||
959 | /* | |
960 | * This is the iodone() function for buffers which have had callbacks | |
961 | * attached to them by xfs_buf_attach_iodone(). It should remove each | |
962 | * log item from the buffer's list and call the callback of each in turn. | |
963 | * When done, the buffer's fsprivate field is set to NULL and the buffer | |
964 | * is unlocked with a call to iodone(). | |
965 | */ | |
966 | void | |
967 | xfs_buf_iodone_callbacks( | |
968 | xfs_buf_t *bp) | |
969 | { | |
970 | xfs_log_item_t *lip; | |
971 | static ulong lasttime; | |
972 | static xfs_buftarg_t *lasttarg; | |
973 | xfs_mount_t *mp; | |
974 | ||
975 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
976 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
977 | ||
978 | if (XFS_BUF_GETERROR(bp) != 0) { | |
979 | /* | |
980 | * If we've already decided to shutdown the filesystem | |
981 | * because of IO errors, there's no point in giving this | |
982 | * a retry. | |
983 | */ | |
984 | mp = lip->li_mountp; | |
985 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
986 | ASSERT(XFS_BUF_TARGET(bp) == mp->m_ddev_targp); | |
987 | XFS_BUF_SUPER_STALE(bp); | |
0b1b213f | 988 | trace_xfs_buf_item_iodone(bp, _RET_IP_); |
1da177e4 LT |
989 | xfs_buf_do_callbacks(bp, lip); |
990 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
991 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
4fdc7781 | 992 | xfs_biodone(bp); |
1da177e4 LT |
993 | return; |
994 | } | |
995 | ||
996 | if ((XFS_BUF_TARGET(bp) != lasttarg) || | |
997 | (time_after(jiffies, (lasttime + 5*HZ)))) { | |
998 | lasttime = jiffies; | |
b6574520 NS |
999 | cmn_err(CE_ALERT, "Device %s, XFS metadata write error" |
1000 | " block 0x%llx in %s", | |
1001 | XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp)), | |
1da177e4 LT |
1002 | (__uint64_t)XFS_BUF_ADDR(bp), mp->m_fsname); |
1003 | } | |
1004 | lasttarg = XFS_BUF_TARGET(bp); | |
1005 | ||
1006 | if (XFS_BUF_ISASYNC(bp)) { | |
1007 | /* | |
1008 | * If the write was asynchronous then noone will be | |
1009 | * looking for the error. Clear the error state | |
1010 | * and write the buffer out again delayed write. | |
1011 | * | |
1012 | * XXXsup This is OK, so long as we catch these | |
1013 | * before we start the umount; we don't want these | |
1014 | * DELWRI metadata bufs to be hanging around. | |
1015 | */ | |
1016 | XFS_BUF_ERROR(bp,0); /* errno of 0 unsets the flag */ | |
1017 | ||
1018 | if (!(XFS_BUF_ISSTALE(bp))) { | |
1019 | XFS_BUF_DELAYWRITE(bp); | |
1020 | XFS_BUF_DONE(bp); | |
1021 | XFS_BUF_SET_START(bp); | |
1022 | } | |
1023 | ASSERT(XFS_BUF_IODONE_FUNC(bp)); | |
0b1b213f | 1024 | trace_xfs_buf_item_iodone_async(bp, _RET_IP_); |
1da177e4 LT |
1025 | xfs_buf_relse(bp); |
1026 | } else { | |
1027 | /* | |
1028 | * If the write of the buffer was not asynchronous, | |
1029 | * then we want to make sure to return the error | |
1030 | * to the caller of bwrite(). Because of this we | |
1031 | * cannot clear the B_ERROR state at this point. | |
1032 | * Instead we install a callback function that | |
1033 | * will be called when the buffer is released, and | |
1034 | * that routine will clear the error state and | |
1035 | * set the buffer to be written out again after | |
1036 | * some delay. | |
1037 | */ | |
1038 | /* We actually overwrite the existing b-relse | |
1039 | function at times, but we're gonna be shutting down | |
1040 | anyway. */ | |
1041 | XFS_BUF_SET_BRELSE_FUNC(bp,xfs_buf_error_relse); | |
1042 | XFS_BUF_DONE(bp); | |
b4dd330b | 1043 | XFS_BUF_FINISH_IOWAIT(bp); |
1da177e4 LT |
1044 | } |
1045 | return; | |
1046 | } | |
0b1b213f | 1047 | |
1da177e4 LT |
1048 | xfs_buf_do_callbacks(bp, lip); |
1049 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
1050 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1051 | xfs_biodone(bp); | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * This is a callback routine attached to a buffer which gets an error | |
1056 | * when being written out synchronously. | |
1057 | */ | |
1058 | STATIC void | |
1059 | xfs_buf_error_relse( | |
1060 | xfs_buf_t *bp) | |
1061 | { | |
1062 | xfs_log_item_t *lip; | |
1063 | xfs_mount_t *mp; | |
1064 | ||
1065 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
1066 | mp = (xfs_mount_t *)lip->li_mountp; | |
1067 | ASSERT(XFS_BUF_TARGET(bp) == mp->m_ddev_targp); | |
1068 | ||
1069 | XFS_BUF_STALE(bp); | |
1070 | XFS_BUF_DONE(bp); | |
1071 | XFS_BUF_UNDELAYWRITE(bp); | |
1072 | XFS_BUF_ERROR(bp,0); | |
0b1b213f CH |
1073 | |
1074 | trace_xfs_buf_error_relse(bp, _RET_IP_); | |
1075 | ||
1da177e4 | 1076 | if (! XFS_FORCED_SHUTDOWN(mp)) |
7d04a335 | 1077 | xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); |
1da177e4 LT |
1078 | /* |
1079 | * We have to unpin the pinned buffers so do the | |
1080 | * callbacks. | |
1081 | */ | |
1082 | xfs_buf_do_callbacks(bp, lip); | |
1083 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
1084 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1085 | XFS_BUF_SET_BRELSE_FUNC(bp,NULL); | |
1086 | xfs_buf_relse(bp); | |
1087 | } | |
1088 | ||
1089 | ||
1090 | /* | |
1091 | * This is the iodone() function for buffers which have been | |
1092 | * logged. It is called when they are eventually flushed out. | |
1093 | * It should remove the buf item from the AIL, and free the buf item. | |
1094 | * It is called by xfs_buf_iodone_callbacks() above which will take | |
1095 | * care of cleaning up the buffer itself. | |
1096 | */ | |
1097 | /* ARGSUSED */ | |
1098 | void | |
1099 | xfs_buf_iodone( | |
1100 | xfs_buf_t *bp, | |
1101 | xfs_buf_log_item_t *bip) | |
1102 | { | |
783a2f65 | 1103 | struct xfs_ail *ailp = bip->bli_item.li_ailp; |
1da177e4 LT |
1104 | |
1105 | ASSERT(bip->bli_buf == bp); | |
1106 | ||
e1f5dbd7 | 1107 | xfs_buf_rele(bp); |
1da177e4 LT |
1108 | |
1109 | /* | |
1110 | * If we are forcibly shutting down, this may well be | |
1111 | * off the AIL already. That's because we simulate the | |
1112 | * log-committed callbacks to unpin these buffers. Or we may never | |
1113 | * have put this item on AIL because of the transaction was | |
783a2f65 | 1114 | * aborted forcibly. xfs_trans_ail_delete() takes care of these. |
1da177e4 LT |
1115 | * |
1116 | * Either way, AIL is useless if we're forcing a shutdown. | |
1117 | */ | |
fc1829f3 | 1118 | spin_lock(&ailp->xa_lock); |
783a2f65 | 1119 | xfs_trans_ail_delete(ailp, (xfs_log_item_t *)bip); |
e1f5dbd7 | 1120 | xfs_buf_item_free(bip); |
1da177e4 | 1121 | } |