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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 | ||
7bfa31d8 CH |
36 | static inline struct xfs_buf_log_item *BUF_ITEM(struct xfs_log_item *lip) |
37 | { | |
38 | return container_of(lip, struct xfs_buf_log_item, bli_item); | |
39 | } | |
40 | ||
41 | ||
1da177e4 LT |
42 | #ifdef XFS_TRANS_DEBUG |
43 | /* | |
44 | * This function uses an alternate strategy for tracking the bytes | |
45 | * that the user requests to be logged. This can then be used | |
46 | * in conjunction with the bli_orig array in the buf log item to | |
47 | * catch bugs in our callers' code. | |
48 | * | |
49 | * We also double check the bits set in xfs_buf_item_log using a | |
50 | * simple algorithm to check that every byte is accounted for. | |
51 | */ | |
52 | STATIC void | |
53 | xfs_buf_item_log_debug( | |
54 | xfs_buf_log_item_t *bip, | |
55 | uint first, | |
56 | uint last) | |
57 | { | |
58 | uint x; | |
59 | uint byte; | |
60 | uint nbytes; | |
61 | uint chunk_num; | |
62 | uint word_num; | |
63 | uint bit_num; | |
64 | uint bit_set; | |
65 | uint *wordp; | |
66 | ||
67 | ASSERT(bip->bli_logged != NULL); | |
68 | byte = first; | |
69 | nbytes = last - first + 1; | |
70 | bfset(bip->bli_logged, first, nbytes); | |
71 | for (x = 0; x < nbytes; x++) { | |
c1155410 | 72 | chunk_num = byte >> XFS_BLF_SHIFT; |
1da177e4 LT |
73 | word_num = chunk_num >> BIT_TO_WORD_SHIFT; |
74 | bit_num = chunk_num & (NBWORD - 1); | |
75 | wordp = &(bip->bli_format.blf_data_map[word_num]); | |
76 | bit_set = *wordp & (1 << bit_num); | |
77 | ASSERT(bit_set); | |
78 | byte++; | |
79 | } | |
80 | } | |
81 | ||
82 | /* | |
83 | * This function is called when we flush something into a buffer without | |
84 | * logging it. This happens for things like inodes which are logged | |
85 | * separately from the buffer. | |
86 | */ | |
87 | void | |
88 | xfs_buf_item_flush_log_debug( | |
89 | xfs_buf_t *bp, | |
90 | uint first, | |
91 | uint last) | |
92 | { | |
93 | xfs_buf_log_item_t *bip; | |
94 | uint nbytes; | |
95 | ||
96 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); | |
97 | if ((bip == NULL) || (bip->bli_item.li_type != XFS_LI_BUF)) { | |
98 | return; | |
99 | } | |
100 | ||
101 | ASSERT(bip->bli_logged != NULL); | |
102 | nbytes = last - first + 1; | |
103 | bfset(bip->bli_logged, first, nbytes); | |
104 | } | |
105 | ||
106 | /* | |
c41564b5 | 107 | * This function is called to verify that our callers have logged |
1da177e4 LT |
108 | * all the bytes that they changed. |
109 | * | |
110 | * It does this by comparing the original copy of the buffer stored in | |
111 | * the buf log item's bli_orig array to the current copy of the buffer | |
c41564b5 | 112 | * and ensuring that all bytes which mismatch are set in the bli_logged |
1da177e4 LT |
113 | * array of the buf log item. |
114 | */ | |
115 | STATIC void | |
116 | xfs_buf_item_log_check( | |
117 | xfs_buf_log_item_t *bip) | |
118 | { | |
119 | char *orig; | |
120 | char *buffer; | |
121 | int x; | |
122 | xfs_buf_t *bp; | |
123 | ||
124 | ASSERT(bip->bli_orig != NULL); | |
125 | ASSERT(bip->bli_logged != NULL); | |
126 | ||
127 | bp = bip->bli_buf; | |
128 | ASSERT(XFS_BUF_COUNT(bp) > 0); | |
129 | ASSERT(XFS_BUF_PTR(bp) != NULL); | |
130 | orig = bip->bli_orig; | |
131 | buffer = XFS_BUF_PTR(bp); | |
132 | for (x = 0; x < XFS_BUF_COUNT(bp); x++) { | |
133 | if (orig[x] != buffer[x] && !btst(bip->bli_logged, x)) | |
134 | cmn_err(CE_PANIC, | |
135 | "xfs_buf_item_log_check bip %x buffer %x orig %x index %d", | |
136 | bip, bp, orig, x); | |
137 | } | |
138 | } | |
139 | #else | |
140 | #define xfs_buf_item_log_debug(x,y,z) | |
141 | #define xfs_buf_item_log_check(x) | |
142 | #endif | |
143 | ||
144 | STATIC void xfs_buf_error_relse(xfs_buf_t *bp); | |
145 | STATIC void xfs_buf_do_callbacks(xfs_buf_t *bp, xfs_log_item_t *lip); | |
146 | ||
147 | /* | |
148 | * This returns the number of log iovecs needed to log the | |
149 | * given buf log item. | |
150 | * | |
151 | * It calculates this as 1 iovec for the buf log format structure | |
152 | * and 1 for each stretch of non-contiguous chunks to be logged. | |
153 | * Contiguous chunks are logged in a single iovec. | |
154 | * | |
155 | * If the XFS_BLI_STALE flag has been set, then log nothing. | |
156 | */ | |
ba0f32d4 | 157 | STATIC uint |
1da177e4 | 158 | xfs_buf_item_size( |
7bfa31d8 | 159 | struct xfs_log_item *lip) |
1da177e4 | 160 | { |
7bfa31d8 CH |
161 | struct xfs_buf_log_item *bip = BUF_ITEM(lip); |
162 | struct xfs_buf *bp = bip->bli_buf; | |
163 | uint nvecs; | |
164 | int next_bit; | |
165 | int last_bit; | |
1da177e4 LT |
166 | |
167 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
168 | if (bip->bli_flags & XFS_BLI_STALE) { | |
169 | /* | |
170 | * The buffer is stale, so all we need to log | |
171 | * is the buf log format structure with the | |
172 | * cancel flag in it. | |
173 | */ | |
0b1b213f | 174 | trace_xfs_buf_item_size_stale(bip); |
c1155410 | 175 | ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL); |
1da177e4 LT |
176 | return 1; |
177 | } | |
178 | ||
1da177e4 LT |
179 | ASSERT(bip->bli_flags & XFS_BLI_LOGGED); |
180 | nvecs = 1; | |
181 | last_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
182 | bip->bli_format.blf_map_size, 0); | |
183 | ASSERT(last_bit != -1); | |
184 | nvecs++; | |
185 | while (last_bit != -1) { | |
186 | /* | |
187 | * This takes the bit number to start looking from and | |
188 | * returns the next set bit from there. It returns -1 | |
189 | * if there are no more bits set or the start bit is | |
190 | * beyond the end of the bitmap. | |
191 | */ | |
192 | next_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
193 | bip->bli_format.blf_map_size, | |
194 | last_bit + 1); | |
195 | /* | |
196 | * If we run out of bits, leave the loop, | |
197 | * else if we find a new set of bits bump the number of vecs, | |
198 | * else keep scanning the current set of bits. | |
199 | */ | |
200 | if (next_bit == -1) { | |
201 | last_bit = -1; | |
202 | } else if (next_bit != last_bit + 1) { | |
203 | last_bit = next_bit; | |
204 | nvecs++; | |
c1155410 DC |
205 | } else if (xfs_buf_offset(bp, next_bit * XFS_BLF_CHUNK) != |
206 | (xfs_buf_offset(bp, last_bit * XFS_BLF_CHUNK) + | |
207 | XFS_BLF_CHUNK)) { | |
1da177e4 LT |
208 | last_bit = next_bit; |
209 | nvecs++; | |
210 | } else { | |
211 | last_bit++; | |
212 | } | |
213 | } | |
214 | ||
0b1b213f | 215 | trace_xfs_buf_item_size(bip); |
1da177e4 LT |
216 | return nvecs; |
217 | } | |
218 | ||
219 | /* | |
220 | * This is called to fill in the vector of log iovecs for the | |
221 | * given log buf item. It fills the first entry with a buf log | |
222 | * format structure, and the rest point to contiguous chunks | |
223 | * within the buffer. | |
224 | */ | |
ba0f32d4 | 225 | STATIC void |
1da177e4 | 226 | xfs_buf_item_format( |
7bfa31d8 CH |
227 | struct xfs_log_item *lip, |
228 | struct xfs_log_iovec *vecp) | |
1da177e4 | 229 | { |
7bfa31d8 CH |
230 | struct xfs_buf_log_item *bip = BUF_ITEM(lip); |
231 | struct xfs_buf *bp = bip->bli_buf; | |
1da177e4 LT |
232 | uint base_size; |
233 | uint nvecs; | |
1da177e4 LT |
234 | int first_bit; |
235 | int last_bit; | |
236 | int next_bit; | |
237 | uint nbits; | |
238 | uint buffer_offset; | |
239 | ||
240 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
241 | ASSERT((bip->bli_flags & XFS_BLI_LOGGED) || | |
242 | (bip->bli_flags & XFS_BLI_STALE)); | |
1da177e4 LT |
243 | |
244 | /* | |
245 | * The size of the base structure is the size of the | |
246 | * declared structure plus the space for the extra words | |
247 | * of the bitmap. We subtract one from the map size, because | |
248 | * the first element of the bitmap is accounted for in the | |
249 | * size of the base structure. | |
250 | */ | |
251 | base_size = | |
252 | (uint)(sizeof(xfs_buf_log_format_t) + | |
253 | ((bip->bli_format.blf_map_size - 1) * sizeof(uint))); | |
4e0d5f92 | 254 | vecp->i_addr = &bip->bli_format; |
1da177e4 | 255 | vecp->i_len = base_size; |
4139b3b3 | 256 | vecp->i_type = XLOG_REG_TYPE_BFORMAT; |
1da177e4 LT |
257 | vecp++; |
258 | nvecs = 1; | |
259 | ||
ccf7c23f DC |
260 | /* |
261 | * If it is an inode buffer, transfer the in-memory state to the | |
262 | * format flags and clear the in-memory state. We do not transfer | |
263 | * this state if the inode buffer allocation has not yet been committed | |
264 | * to the log as setting the XFS_BLI_INODE_BUF flag will prevent | |
265 | * correct replay of the inode allocation. | |
266 | */ | |
267 | if (bip->bli_flags & XFS_BLI_INODE_BUF) { | |
268 | if (!((bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF) && | |
7bfa31d8 | 269 | xfs_log_item_in_current_chkpt(lip))) |
ccf7c23f DC |
270 | bip->bli_format.blf_flags |= XFS_BLF_INODE_BUF; |
271 | bip->bli_flags &= ~XFS_BLI_INODE_BUF; | |
272 | } | |
273 | ||
1da177e4 LT |
274 | if (bip->bli_flags & XFS_BLI_STALE) { |
275 | /* | |
276 | * The buffer is stale, so all we need to log | |
277 | * is the buf log format structure with the | |
278 | * cancel flag in it. | |
279 | */ | |
0b1b213f | 280 | trace_xfs_buf_item_format_stale(bip); |
c1155410 | 281 | ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL); |
1da177e4 LT |
282 | bip->bli_format.blf_size = nvecs; |
283 | return; | |
284 | } | |
285 | ||
286 | /* | |
287 | * Fill in an iovec for each set of contiguous chunks. | |
288 | */ | |
289 | first_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
290 | bip->bli_format.blf_map_size, 0); | |
291 | ASSERT(first_bit != -1); | |
292 | last_bit = first_bit; | |
293 | nbits = 1; | |
294 | for (;;) { | |
295 | /* | |
296 | * This takes the bit number to start looking from and | |
297 | * returns the next set bit from there. It returns -1 | |
298 | * if there are no more bits set or the start bit is | |
299 | * beyond the end of the bitmap. | |
300 | */ | |
301 | next_bit = xfs_next_bit(bip->bli_format.blf_data_map, | |
302 | bip->bli_format.blf_map_size, | |
303 | (uint)last_bit + 1); | |
304 | /* | |
305 | * If we run out of bits fill in the last iovec and get | |
306 | * out of the loop. | |
307 | * Else if we start a new set of bits then fill in the | |
308 | * iovec for the series we were looking at and start | |
309 | * counting the bits in the new one. | |
310 | * Else we're still in the same set of bits so just | |
311 | * keep counting and scanning. | |
312 | */ | |
313 | if (next_bit == -1) { | |
c1155410 | 314 | buffer_offset = first_bit * XFS_BLF_CHUNK; |
1da177e4 | 315 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); |
c1155410 | 316 | vecp->i_len = nbits * XFS_BLF_CHUNK; |
4139b3b3 | 317 | vecp->i_type = XLOG_REG_TYPE_BCHUNK; |
1da177e4 LT |
318 | nvecs++; |
319 | break; | |
320 | } else if (next_bit != last_bit + 1) { | |
c1155410 | 321 | buffer_offset = first_bit * XFS_BLF_CHUNK; |
1da177e4 | 322 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); |
c1155410 | 323 | vecp->i_len = nbits * XFS_BLF_CHUNK; |
4139b3b3 | 324 | vecp->i_type = XLOG_REG_TYPE_BCHUNK; |
1da177e4 LT |
325 | nvecs++; |
326 | vecp++; | |
327 | first_bit = next_bit; | |
328 | last_bit = next_bit; | |
329 | nbits = 1; | |
c1155410 DC |
330 | } else if (xfs_buf_offset(bp, next_bit << XFS_BLF_SHIFT) != |
331 | (xfs_buf_offset(bp, last_bit << XFS_BLF_SHIFT) + | |
332 | XFS_BLF_CHUNK)) { | |
333 | buffer_offset = first_bit * XFS_BLF_CHUNK; | |
1da177e4 | 334 | vecp->i_addr = xfs_buf_offset(bp, buffer_offset); |
c1155410 | 335 | vecp->i_len = nbits * XFS_BLF_CHUNK; |
4139b3b3 | 336 | vecp->i_type = XLOG_REG_TYPE_BCHUNK; |
1da177e4 LT |
337 | /* You would think we need to bump the nvecs here too, but we do not |
338 | * this number is used by recovery, and it gets confused by the boundary | |
339 | * split here | |
340 | * nvecs++; | |
341 | */ | |
342 | vecp++; | |
343 | first_bit = next_bit; | |
344 | last_bit = next_bit; | |
345 | nbits = 1; | |
346 | } else { | |
347 | last_bit++; | |
348 | nbits++; | |
349 | } | |
350 | } | |
351 | bip->bli_format.blf_size = nvecs; | |
352 | ||
353 | /* | |
354 | * Check to make sure everything is consistent. | |
355 | */ | |
0b1b213f | 356 | trace_xfs_buf_item_format(bip); |
1da177e4 LT |
357 | xfs_buf_item_log_check(bip); |
358 | } | |
359 | ||
360 | /* | |
64fc35de | 361 | * This is called to pin the buffer associated with the buf log item in memory |
4d16e924 | 362 | * so it cannot be written out. |
64fc35de DC |
363 | * |
364 | * We also always take a reference to the buffer log item here so that the bli | |
365 | * is held while the item is pinned in memory. This means that we can | |
366 | * unconditionally drop the reference count a transaction holds when the | |
367 | * transaction is completed. | |
1da177e4 | 368 | */ |
ba0f32d4 | 369 | STATIC void |
1da177e4 | 370 | xfs_buf_item_pin( |
7bfa31d8 | 371 | struct xfs_log_item *lip) |
1da177e4 | 372 | { |
7bfa31d8 | 373 | struct xfs_buf_log_item *bip = BUF_ITEM(lip); |
1da177e4 | 374 | |
7bfa31d8 | 375 | ASSERT(XFS_BUF_ISBUSY(bip->bli_buf)); |
1da177e4 LT |
376 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
377 | ASSERT((bip->bli_flags & XFS_BLI_LOGGED) || | |
378 | (bip->bli_flags & XFS_BLI_STALE)); | |
7bfa31d8 | 379 | |
0b1b213f | 380 | trace_xfs_buf_item_pin(bip); |
4d16e924 CH |
381 | |
382 | atomic_inc(&bip->bli_refcount); | |
383 | atomic_inc(&bip->bli_buf->b_pin_count); | |
1da177e4 LT |
384 | } |
385 | ||
1da177e4 LT |
386 | /* |
387 | * This is called to unpin the buffer associated with the buf log | |
388 | * item which was previously pinned with a call to xfs_buf_item_pin(). | |
1da177e4 LT |
389 | * |
390 | * Also drop the reference to the buf item for the current transaction. | |
391 | * If the XFS_BLI_STALE flag is set and we are the last reference, | |
392 | * then free up the buf log item and unlock the buffer. | |
9412e318 CH |
393 | * |
394 | * If the remove flag is set we are called from uncommit in the | |
395 | * forced-shutdown path. If that is true and the reference count on | |
396 | * the log item is going to drop to zero we need to free the item's | |
397 | * descriptor in the transaction. | |
1da177e4 | 398 | */ |
ba0f32d4 | 399 | STATIC void |
1da177e4 | 400 | xfs_buf_item_unpin( |
7bfa31d8 | 401 | struct xfs_log_item *lip, |
9412e318 | 402 | int remove) |
1da177e4 | 403 | { |
7bfa31d8 | 404 | struct xfs_buf_log_item *bip = BUF_ITEM(lip); |
9412e318 | 405 | xfs_buf_t *bp = bip->bli_buf; |
7bfa31d8 | 406 | struct xfs_ail *ailp = lip->li_ailp; |
8e123850 | 407 | int stale = bip->bli_flags & XFS_BLI_STALE; |
7bfa31d8 | 408 | int freed; |
1da177e4 | 409 | |
1da177e4 LT |
410 | ASSERT(XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *) == bip); |
411 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
9412e318 | 412 | |
0b1b213f | 413 | trace_xfs_buf_item_unpin(bip); |
1da177e4 LT |
414 | |
415 | freed = atomic_dec_and_test(&bip->bli_refcount); | |
4d16e924 CH |
416 | |
417 | if (atomic_dec_and_test(&bp->b_pin_count)) | |
418 | wake_up_all(&bp->b_waiters); | |
7bfa31d8 | 419 | |
1da177e4 LT |
420 | if (freed && stale) { |
421 | ASSERT(bip->bli_flags & XFS_BLI_STALE); | |
422 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
423 | ASSERT(!(XFS_BUF_ISDELAYWRITE(bp))); | |
424 | ASSERT(XFS_BUF_ISSTALE(bp)); | |
c1155410 | 425 | ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL); |
9412e318 | 426 | |
0b1b213f CH |
427 | trace_xfs_buf_item_unpin_stale(bip); |
428 | ||
9412e318 CH |
429 | if (remove) { |
430 | /* | |
431 | * We have to remove the log item from the transaction | |
432 | * as we are about to release our reference to the | |
433 | * buffer. If we don't, the unlock that occurs later | |
434 | * in xfs_trans_uncommit() will ry to reference the | |
435 | * buffer which we no longer have a hold on. | |
436 | */ | |
7bfa31d8 | 437 | xfs_trans_del_item(lip); |
9412e318 CH |
438 | |
439 | /* | |
440 | * Since the transaction no longer refers to the buffer, | |
441 | * the buffer should no longer refer to the transaction. | |
442 | */ | |
443 | XFS_BUF_SET_FSPRIVATE2(bp, NULL); | |
444 | } | |
445 | ||
1da177e4 LT |
446 | /* |
447 | * If we get called here because of an IO error, we may | |
783a2f65 | 448 | * or may not have the item on the AIL. xfs_trans_ail_delete() |
1da177e4 | 449 | * will take care of that situation. |
783a2f65 | 450 | * xfs_trans_ail_delete() drops the AIL lock. |
1da177e4 LT |
451 | */ |
452 | if (bip->bli_flags & XFS_BLI_STALE_INODE) { | |
453 | xfs_buf_do_callbacks(bp, (xfs_log_item_t *)bip); | |
454 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
455 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
456 | } else { | |
783a2f65 DC |
457 | spin_lock(&ailp->xa_lock); |
458 | xfs_trans_ail_delete(ailp, (xfs_log_item_t *)bip); | |
1da177e4 LT |
459 | xfs_buf_item_relse(bp); |
460 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) == NULL); | |
461 | } | |
462 | xfs_buf_relse(bp); | |
463 | } | |
464 | } | |
465 | ||
1da177e4 LT |
466 | /* |
467 | * This is called to attempt to lock the buffer associated with this | |
468 | * buf log item. Don't sleep on the buffer lock. If we can't get | |
d808f617 DC |
469 | * the lock right away, return 0. If we can get the lock, take a |
470 | * reference to the buffer. If this is a delayed write buffer that | |
471 | * needs AIL help to be written back, invoke the pushbuf routine | |
472 | * rather than the normal success path. | |
1da177e4 | 473 | */ |
ba0f32d4 | 474 | STATIC uint |
1da177e4 | 475 | xfs_buf_item_trylock( |
7bfa31d8 | 476 | struct xfs_log_item *lip) |
1da177e4 | 477 | { |
7bfa31d8 CH |
478 | struct xfs_buf_log_item *bip = BUF_ITEM(lip); |
479 | struct xfs_buf *bp = bip->bli_buf; | |
1da177e4 | 480 | |
d808f617 | 481 | if (XFS_BUF_ISPINNED(bp)) |
1da177e4 | 482 | return XFS_ITEM_PINNED; |
d808f617 | 483 | if (!XFS_BUF_CPSEMA(bp)) |
1da177e4 | 484 | return XFS_ITEM_LOCKED; |
1da177e4 | 485 | |
d808f617 | 486 | /* take a reference to the buffer. */ |
1da177e4 LT |
487 | XFS_BUF_HOLD(bp); |
488 | ||
489 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
0b1b213f | 490 | trace_xfs_buf_item_trylock(bip); |
d808f617 DC |
491 | if (XFS_BUF_ISDELAYWRITE(bp)) |
492 | return XFS_ITEM_PUSHBUF; | |
1da177e4 LT |
493 | return XFS_ITEM_SUCCESS; |
494 | } | |
495 | ||
496 | /* | |
64fc35de DC |
497 | * Release the buffer associated with the buf log item. If there is no dirty |
498 | * logged data associated with the buffer recorded in the buf log item, then | |
499 | * free the buf log item and remove the reference to it in the buffer. | |
1da177e4 | 500 | * |
64fc35de DC |
501 | * This call ignores the recursion count. It is only called when the buffer |
502 | * should REALLY be unlocked, regardless of the recursion count. | |
1da177e4 | 503 | * |
64fc35de DC |
504 | * We unconditionally drop the transaction's reference to the log item. If the |
505 | * item was logged, then another reference was taken when it was pinned, so we | |
506 | * can safely drop the transaction reference now. This also allows us to avoid | |
507 | * potential races with the unpin code freeing the bli by not referencing the | |
508 | * bli after we've dropped the reference count. | |
509 | * | |
510 | * If the XFS_BLI_HOLD flag is set in the buf log item, then free the log item | |
511 | * if necessary but do not unlock the buffer. This is for support of | |
512 | * xfs_trans_bhold(). Make sure the XFS_BLI_HOLD field is cleared if we don't | |
513 | * free the item. | |
1da177e4 | 514 | */ |
ba0f32d4 | 515 | STATIC void |
1da177e4 | 516 | xfs_buf_item_unlock( |
7bfa31d8 | 517 | struct xfs_log_item *lip) |
1da177e4 | 518 | { |
7bfa31d8 CH |
519 | struct xfs_buf_log_item *bip = BUF_ITEM(lip); |
520 | struct xfs_buf *bp = bip->bli_buf; | |
521 | int aborted; | |
522 | uint hold; | |
1da177e4 | 523 | |
64fc35de | 524 | /* Clear the buffer's association with this transaction. */ |
1da177e4 LT |
525 | XFS_BUF_SET_FSPRIVATE2(bp, NULL); |
526 | ||
527 | /* | |
64fc35de DC |
528 | * If this is a transaction abort, don't return early. Instead, allow |
529 | * the brelse to happen. Normally it would be done for stale | |
530 | * (cancelled) buffers at unpin time, but we'll never go through the | |
531 | * pin/unpin cycle if we abort inside commit. | |
1da177e4 | 532 | */ |
7bfa31d8 | 533 | aborted = (lip->li_flags & XFS_LI_ABORTED) != 0; |
1da177e4 LT |
534 | |
535 | /* | |
64fc35de DC |
536 | * Before possibly freeing the buf item, determine if we should |
537 | * release the buffer at the end of this routine. | |
538 | */ | |
539 | hold = bip->bli_flags & XFS_BLI_HOLD; | |
540 | ||
541 | /* Clear the per transaction state. */ | |
542 | bip->bli_flags &= ~(XFS_BLI_LOGGED | XFS_BLI_HOLD); | |
543 | ||
544 | /* | |
545 | * If the buf item is marked stale, then don't do anything. We'll | |
546 | * unlock the buffer and free the buf item when the buffer is unpinned | |
547 | * for the last time. | |
1da177e4 LT |
548 | */ |
549 | if (bip->bli_flags & XFS_BLI_STALE) { | |
0b1b213f | 550 | trace_xfs_buf_item_unlock_stale(bip); |
c1155410 | 551 | ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL); |
64fc35de DC |
552 | if (!aborted) { |
553 | atomic_dec(&bip->bli_refcount); | |
1da177e4 | 554 | return; |
64fc35de | 555 | } |
1da177e4 LT |
556 | } |
557 | ||
0b1b213f | 558 | trace_xfs_buf_item_unlock(bip); |
1da177e4 LT |
559 | |
560 | /* | |
64fc35de DC |
561 | * If the buf item isn't tracking any data, free it, otherwise drop the |
562 | * reference we hold to it. | |
1da177e4 | 563 | */ |
24ad33ff | 564 | if (xfs_bitmap_empty(bip->bli_format.blf_data_map, |
64fc35de | 565 | bip->bli_format.blf_map_size)) |
1da177e4 | 566 | xfs_buf_item_relse(bp); |
64fc35de DC |
567 | else |
568 | atomic_dec(&bip->bli_refcount); | |
1da177e4 | 569 | |
64fc35de | 570 | if (!hold) |
1da177e4 | 571 | xfs_buf_relse(bp); |
1da177e4 LT |
572 | } |
573 | ||
574 | /* | |
575 | * This is called to find out where the oldest active copy of the | |
576 | * buf log item in the on disk log resides now that the last log | |
577 | * write of it completed at the given lsn. | |
578 | * We always re-log all the dirty data in a buffer, so usually the | |
579 | * latest copy in the on disk log is the only one that matters. For | |
580 | * those cases we simply return the given lsn. | |
581 | * | |
582 | * The one exception to this is for buffers full of newly allocated | |
583 | * inodes. These buffers are only relogged with the XFS_BLI_INODE_BUF | |
584 | * flag set, indicating that only the di_next_unlinked fields from the | |
585 | * inodes in the buffers will be replayed during recovery. If the | |
586 | * original newly allocated inode images have not yet been flushed | |
587 | * when the buffer is so relogged, then we need to make sure that we | |
588 | * keep the old images in the 'active' portion of the log. We do this | |
589 | * by returning the original lsn of that transaction here rather than | |
590 | * the current one. | |
591 | */ | |
ba0f32d4 | 592 | STATIC xfs_lsn_t |
1da177e4 | 593 | xfs_buf_item_committed( |
7bfa31d8 | 594 | struct xfs_log_item *lip, |
1da177e4 LT |
595 | xfs_lsn_t lsn) |
596 | { | |
7bfa31d8 CH |
597 | struct xfs_buf_log_item *bip = BUF_ITEM(lip); |
598 | ||
0b1b213f CH |
599 | trace_xfs_buf_item_committed(bip); |
600 | ||
7bfa31d8 CH |
601 | if ((bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF) && lip->li_lsn != 0) |
602 | return lip->li_lsn; | |
603 | return lsn; | |
1da177e4 LT |
604 | } |
605 | ||
1da177e4 | 606 | /* |
d808f617 DC |
607 | * The buffer is locked, but is not a delayed write buffer. This happens |
608 | * if we race with IO completion and hence we don't want to try to write it | |
609 | * again. Just release the buffer. | |
1da177e4 | 610 | */ |
ba0f32d4 | 611 | STATIC void |
1da177e4 | 612 | xfs_buf_item_push( |
7bfa31d8 | 613 | struct xfs_log_item *lip) |
1da177e4 | 614 | { |
7bfa31d8 CH |
615 | struct xfs_buf_log_item *bip = BUF_ITEM(lip); |
616 | struct xfs_buf *bp = bip->bli_buf; | |
1da177e4 LT |
617 | |
618 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
7bfa31d8 CH |
619 | ASSERT(!XFS_BUF_ISDELAYWRITE(bp)); |
620 | ||
0b1b213f | 621 | trace_xfs_buf_item_push(bip); |
1da177e4 | 622 | |
d808f617 DC |
623 | xfs_buf_relse(bp); |
624 | } | |
1da177e4 | 625 | |
d808f617 DC |
626 | /* |
627 | * The buffer is locked and is a delayed write buffer. Promote the buffer | |
628 | * in the delayed write queue as the caller knows that they must invoke | |
629 | * the xfsbufd to get this buffer written. We have to unlock the buffer | |
630 | * to allow the xfsbufd to write it, too. | |
631 | */ | |
632 | STATIC void | |
633 | xfs_buf_item_pushbuf( | |
7bfa31d8 | 634 | struct xfs_log_item *lip) |
d808f617 | 635 | { |
7bfa31d8 CH |
636 | struct xfs_buf_log_item *bip = BUF_ITEM(lip); |
637 | struct xfs_buf *bp = bip->bli_buf; | |
d808f617 DC |
638 | |
639 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
7bfa31d8 CH |
640 | ASSERT(XFS_BUF_ISDELAYWRITE(bp)); |
641 | ||
d808f617 DC |
642 | trace_xfs_buf_item_pushbuf(bip); |
643 | ||
d808f617 DC |
644 | xfs_buf_delwri_promote(bp); |
645 | xfs_buf_relse(bp); | |
1da177e4 LT |
646 | } |
647 | ||
ba0f32d4 | 648 | STATIC void |
7bfa31d8 CH |
649 | xfs_buf_item_committing( |
650 | struct xfs_log_item *lip, | |
651 | xfs_lsn_t commit_lsn) | |
1da177e4 LT |
652 | { |
653 | } | |
654 | ||
655 | /* | |
656 | * This is the ops vector shared by all buf log items. | |
657 | */ | |
7989cb8e | 658 | static struct xfs_item_ops xfs_buf_item_ops = { |
7bfa31d8 CH |
659 | .iop_size = xfs_buf_item_size, |
660 | .iop_format = xfs_buf_item_format, | |
661 | .iop_pin = xfs_buf_item_pin, | |
662 | .iop_unpin = xfs_buf_item_unpin, | |
663 | .iop_trylock = xfs_buf_item_trylock, | |
664 | .iop_unlock = xfs_buf_item_unlock, | |
665 | .iop_committed = xfs_buf_item_committed, | |
666 | .iop_push = xfs_buf_item_push, | |
667 | .iop_pushbuf = xfs_buf_item_pushbuf, | |
668 | .iop_committing = xfs_buf_item_committing | |
1da177e4 LT |
669 | }; |
670 | ||
671 | ||
672 | /* | |
673 | * Allocate a new buf log item to go with the given buffer. | |
674 | * Set the buffer's b_fsprivate field to point to the new | |
675 | * buf log item. If there are other item's attached to the | |
676 | * buffer (see xfs_buf_attach_iodone() below), then put the | |
677 | * buf log item at the front. | |
678 | */ | |
679 | void | |
680 | xfs_buf_item_init( | |
681 | xfs_buf_t *bp, | |
682 | xfs_mount_t *mp) | |
683 | { | |
684 | xfs_log_item_t *lip; | |
685 | xfs_buf_log_item_t *bip; | |
686 | int chunks; | |
687 | int map_size; | |
688 | ||
689 | /* | |
690 | * Check to see if there is already a buf log item for | |
691 | * this buffer. If there is, it is guaranteed to be | |
692 | * the first. If we do already have one, there is | |
693 | * nothing to do here so return. | |
694 | */ | |
ebad861b | 695 | ASSERT(bp->b_target->bt_mount == mp); |
1da177e4 LT |
696 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { |
697 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
698 | if (lip->li_type == XFS_LI_BUF) { | |
699 | return; | |
700 | } | |
701 | } | |
702 | ||
703 | /* | |
c1155410 | 704 | * chunks is the number of XFS_BLF_CHUNK size pieces |
1da177e4 LT |
705 | * the buffer can be divided into. Make sure not to |
706 | * truncate any pieces. map_size is the size of the | |
707 | * bitmap needed to describe the chunks of the buffer. | |
708 | */ | |
c1155410 | 709 | chunks = (int)((XFS_BUF_COUNT(bp) + (XFS_BLF_CHUNK - 1)) >> XFS_BLF_SHIFT); |
1da177e4 LT |
710 | map_size = (int)((chunks + NBWORD) >> BIT_TO_WORD_SHIFT); |
711 | ||
712 | bip = (xfs_buf_log_item_t*)kmem_zone_zalloc(xfs_buf_item_zone, | |
713 | KM_SLEEP); | |
43f5efc5 | 714 | xfs_log_item_init(mp, &bip->bli_item, XFS_LI_BUF, &xfs_buf_item_ops); |
1da177e4 | 715 | bip->bli_buf = bp; |
e1f5dbd7 | 716 | xfs_buf_hold(bp); |
1da177e4 LT |
717 | bip->bli_format.blf_type = XFS_LI_BUF; |
718 | bip->bli_format.blf_blkno = (__int64_t)XFS_BUF_ADDR(bp); | |
719 | bip->bli_format.blf_len = (ushort)BTOBB(XFS_BUF_COUNT(bp)); | |
720 | bip->bli_format.blf_map_size = map_size; | |
1da177e4 LT |
721 | |
722 | #ifdef XFS_TRANS_DEBUG | |
723 | /* | |
724 | * Allocate the arrays for tracking what needs to be logged | |
725 | * and what our callers request to be logged. bli_orig | |
726 | * holds a copy of the original, clean buffer for comparison | |
727 | * against, and bli_logged keeps a 1 bit flag per byte in | |
728 | * the buffer to indicate which bytes the callers have asked | |
729 | * to have logged. | |
730 | */ | |
731 | bip->bli_orig = (char *)kmem_alloc(XFS_BUF_COUNT(bp), KM_SLEEP); | |
732 | memcpy(bip->bli_orig, XFS_BUF_PTR(bp), XFS_BUF_COUNT(bp)); | |
733 | bip->bli_logged = (char *)kmem_zalloc(XFS_BUF_COUNT(bp) / NBBY, KM_SLEEP); | |
734 | #endif | |
735 | ||
736 | /* | |
737 | * Put the buf item into the list of items attached to the | |
738 | * buffer at the front. | |
739 | */ | |
740 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
741 | bip->bli_item.li_bio_list = | |
742 | XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
743 | } | |
744 | XFS_BUF_SET_FSPRIVATE(bp, bip); | |
745 | } | |
746 | ||
747 | ||
748 | /* | |
749 | * Mark bytes first through last inclusive as dirty in the buf | |
750 | * item's bitmap. | |
751 | */ | |
752 | void | |
753 | xfs_buf_item_log( | |
754 | xfs_buf_log_item_t *bip, | |
755 | uint first, | |
756 | uint last) | |
757 | { | |
758 | uint first_bit; | |
759 | uint last_bit; | |
760 | uint bits_to_set; | |
761 | uint bits_set; | |
762 | uint word_num; | |
763 | uint *wordp; | |
764 | uint bit; | |
765 | uint end_bit; | |
766 | uint mask; | |
767 | ||
768 | /* | |
769 | * Mark the item as having some dirty data for | |
770 | * quick reference in xfs_buf_item_dirty. | |
771 | */ | |
772 | bip->bli_flags |= XFS_BLI_DIRTY; | |
773 | ||
774 | /* | |
775 | * Convert byte offsets to bit numbers. | |
776 | */ | |
c1155410 DC |
777 | first_bit = first >> XFS_BLF_SHIFT; |
778 | last_bit = last >> XFS_BLF_SHIFT; | |
1da177e4 LT |
779 | |
780 | /* | |
781 | * Calculate the total number of bits to be set. | |
782 | */ | |
783 | bits_to_set = last_bit - first_bit + 1; | |
784 | ||
785 | /* | |
786 | * Get a pointer to the first word in the bitmap | |
787 | * to set a bit in. | |
788 | */ | |
789 | word_num = first_bit >> BIT_TO_WORD_SHIFT; | |
790 | wordp = &(bip->bli_format.blf_data_map[word_num]); | |
791 | ||
792 | /* | |
793 | * Calculate the starting bit in the first word. | |
794 | */ | |
795 | bit = first_bit & (uint)(NBWORD - 1); | |
796 | ||
797 | /* | |
798 | * First set any bits in the first word of our range. | |
799 | * If it starts at bit 0 of the word, it will be | |
800 | * set below rather than here. That is what the variable | |
801 | * bit tells us. The variable bits_set tracks the number | |
802 | * of bits that have been set so far. End_bit is the number | |
803 | * of the last bit to be set in this word plus one. | |
804 | */ | |
805 | if (bit) { | |
806 | end_bit = MIN(bit + bits_to_set, (uint)NBWORD); | |
807 | mask = ((1 << (end_bit - bit)) - 1) << bit; | |
808 | *wordp |= mask; | |
809 | wordp++; | |
810 | bits_set = end_bit - bit; | |
811 | } else { | |
812 | bits_set = 0; | |
813 | } | |
814 | ||
815 | /* | |
816 | * Now set bits a whole word at a time that are between | |
817 | * first_bit and last_bit. | |
818 | */ | |
819 | while ((bits_to_set - bits_set) >= NBWORD) { | |
820 | *wordp |= 0xffffffff; | |
821 | bits_set += NBWORD; | |
822 | wordp++; | |
823 | } | |
824 | ||
825 | /* | |
826 | * Finally, set any bits left to be set in one last partial word. | |
827 | */ | |
828 | end_bit = bits_to_set - bits_set; | |
829 | if (end_bit) { | |
830 | mask = (1 << end_bit) - 1; | |
831 | *wordp |= mask; | |
832 | } | |
833 | ||
834 | xfs_buf_item_log_debug(bip, first, last); | |
835 | } | |
836 | ||
837 | ||
838 | /* | |
839 | * Return 1 if the buffer has some data that has been logged (at any | |
840 | * point, not just the current transaction) and 0 if not. | |
841 | */ | |
842 | uint | |
843 | xfs_buf_item_dirty( | |
844 | xfs_buf_log_item_t *bip) | |
845 | { | |
846 | return (bip->bli_flags & XFS_BLI_DIRTY); | |
847 | } | |
848 | ||
e1f5dbd7 LM |
849 | STATIC void |
850 | xfs_buf_item_free( | |
851 | xfs_buf_log_item_t *bip) | |
852 | { | |
853 | #ifdef XFS_TRANS_DEBUG | |
854 | kmem_free(bip->bli_orig); | |
855 | kmem_free(bip->bli_logged); | |
856 | #endif /* XFS_TRANS_DEBUG */ | |
857 | ||
e1f5dbd7 LM |
858 | kmem_zone_free(xfs_buf_item_zone, bip); |
859 | } | |
860 | ||
1da177e4 LT |
861 | /* |
862 | * This is called when the buf log item is no longer needed. It should | |
863 | * free the buf log item associated with the given buffer and clear | |
864 | * the buffer's pointer to the buf log item. If there are no more | |
865 | * items in the list, clear the b_iodone field of the buffer (see | |
866 | * xfs_buf_attach_iodone() below). | |
867 | */ | |
868 | void | |
869 | xfs_buf_item_relse( | |
870 | xfs_buf_t *bp) | |
871 | { | |
872 | xfs_buf_log_item_t *bip; | |
873 | ||
0b1b213f CH |
874 | trace_xfs_buf_item_relse(bp, _RET_IP_); |
875 | ||
1da177e4 LT |
876 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); |
877 | XFS_BUF_SET_FSPRIVATE(bp, bip->bli_item.li_bio_list); | |
878 | if ((XFS_BUF_FSPRIVATE(bp, void *) == NULL) && | |
879 | (XFS_BUF_IODONE_FUNC(bp) != NULL)) { | |
1da177e4 LT |
880 | XFS_BUF_CLR_IODONE_FUNC(bp); |
881 | } | |
e1f5dbd7 LM |
882 | xfs_buf_rele(bp); |
883 | xfs_buf_item_free(bip); | |
1da177e4 LT |
884 | } |
885 | ||
886 | ||
887 | /* | |
888 | * Add the given log item with its callback to the list of callbacks | |
889 | * to be called when the buffer's I/O completes. If it is not set | |
890 | * already, set the buffer's b_iodone() routine to be | |
891 | * xfs_buf_iodone_callbacks() and link the log item into the list of | |
892 | * items rooted at b_fsprivate. Items are always added as the second | |
893 | * entry in the list if there is a first, because the buf item code | |
894 | * assumes that the buf log item is first. | |
895 | */ | |
896 | void | |
897 | xfs_buf_attach_iodone( | |
898 | xfs_buf_t *bp, | |
899 | void (*cb)(xfs_buf_t *, xfs_log_item_t *), | |
900 | xfs_log_item_t *lip) | |
901 | { | |
902 | xfs_log_item_t *head_lip; | |
903 | ||
904 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
905 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
906 | ||
907 | lip->li_cb = cb; | |
908 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
909 | head_lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
910 | lip->li_bio_list = head_lip->li_bio_list; | |
911 | head_lip->li_bio_list = lip; | |
912 | } else { | |
913 | XFS_BUF_SET_FSPRIVATE(bp, lip); | |
914 | } | |
915 | ||
916 | ASSERT((XFS_BUF_IODONE_FUNC(bp) == xfs_buf_iodone_callbacks) || | |
917 | (XFS_BUF_IODONE_FUNC(bp) == NULL)); | |
918 | XFS_BUF_SET_IODONE_FUNC(bp, xfs_buf_iodone_callbacks); | |
919 | } | |
920 | ||
921 | STATIC void | |
922 | xfs_buf_do_callbacks( | |
923 | xfs_buf_t *bp, | |
924 | xfs_log_item_t *lip) | |
925 | { | |
926 | xfs_log_item_t *nlip; | |
927 | ||
928 | while (lip != NULL) { | |
929 | nlip = lip->li_bio_list; | |
930 | ASSERT(lip->li_cb != NULL); | |
931 | /* | |
932 | * Clear the next pointer so we don't have any | |
933 | * confusion if the item is added to another buf. | |
934 | * Don't touch the log item after calling its | |
935 | * callback, because it could have freed itself. | |
936 | */ | |
937 | lip->li_bio_list = NULL; | |
938 | lip->li_cb(bp, lip); | |
939 | lip = nlip; | |
940 | } | |
941 | } | |
942 | ||
943 | /* | |
944 | * This is the iodone() function for buffers which have had callbacks | |
945 | * attached to them by xfs_buf_attach_iodone(). It should remove each | |
946 | * log item from the buffer's list and call the callback of each in turn. | |
947 | * When done, the buffer's fsprivate field is set to NULL and the buffer | |
948 | * is unlocked with a call to iodone(). | |
949 | */ | |
950 | void | |
951 | xfs_buf_iodone_callbacks( | |
952 | xfs_buf_t *bp) | |
953 | { | |
954 | xfs_log_item_t *lip; | |
955 | static ulong lasttime; | |
956 | static xfs_buftarg_t *lasttarg; | |
957 | xfs_mount_t *mp; | |
958 | ||
959 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
960 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
961 | ||
962 | if (XFS_BUF_GETERROR(bp) != 0) { | |
963 | /* | |
964 | * If we've already decided to shutdown the filesystem | |
965 | * because of IO errors, there's no point in giving this | |
966 | * a retry. | |
967 | */ | |
968 | mp = lip->li_mountp; | |
969 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
970 | ASSERT(XFS_BUF_TARGET(bp) == mp->m_ddev_targp); | |
971 | XFS_BUF_SUPER_STALE(bp); | |
0b1b213f | 972 | trace_xfs_buf_item_iodone(bp, _RET_IP_); |
1da177e4 LT |
973 | xfs_buf_do_callbacks(bp, lip); |
974 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
975 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1a1a3e97 | 976 | xfs_buf_ioend(bp, 0); |
1da177e4 LT |
977 | return; |
978 | } | |
979 | ||
980 | if ((XFS_BUF_TARGET(bp) != lasttarg) || | |
981 | (time_after(jiffies, (lasttime + 5*HZ)))) { | |
982 | lasttime = jiffies; | |
b6574520 NS |
983 | cmn_err(CE_ALERT, "Device %s, XFS metadata write error" |
984 | " block 0x%llx in %s", | |
985 | XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp)), | |
1da177e4 LT |
986 | (__uint64_t)XFS_BUF_ADDR(bp), mp->m_fsname); |
987 | } | |
988 | lasttarg = XFS_BUF_TARGET(bp); | |
989 | ||
990 | if (XFS_BUF_ISASYNC(bp)) { | |
991 | /* | |
992 | * If the write was asynchronous then noone will be | |
993 | * looking for the error. Clear the error state | |
994 | * and write the buffer out again delayed write. | |
995 | * | |
996 | * XXXsup This is OK, so long as we catch these | |
997 | * before we start the umount; we don't want these | |
998 | * DELWRI metadata bufs to be hanging around. | |
999 | */ | |
1000 | XFS_BUF_ERROR(bp,0); /* errno of 0 unsets the flag */ | |
1001 | ||
1002 | if (!(XFS_BUF_ISSTALE(bp))) { | |
1003 | XFS_BUF_DELAYWRITE(bp); | |
1004 | XFS_BUF_DONE(bp); | |
1005 | XFS_BUF_SET_START(bp); | |
1006 | } | |
1007 | ASSERT(XFS_BUF_IODONE_FUNC(bp)); | |
0b1b213f | 1008 | trace_xfs_buf_item_iodone_async(bp, _RET_IP_); |
1da177e4 LT |
1009 | xfs_buf_relse(bp); |
1010 | } else { | |
1011 | /* | |
1012 | * If the write of the buffer was not asynchronous, | |
1013 | * then we want to make sure to return the error | |
1014 | * to the caller of bwrite(). Because of this we | |
1015 | * cannot clear the B_ERROR state at this point. | |
1016 | * Instead we install a callback function that | |
1017 | * will be called when the buffer is released, and | |
1018 | * that routine will clear the error state and | |
1019 | * set the buffer to be written out again after | |
1020 | * some delay. | |
1021 | */ | |
1022 | /* We actually overwrite the existing b-relse | |
1023 | function at times, but we're gonna be shutting down | |
1024 | anyway. */ | |
1025 | XFS_BUF_SET_BRELSE_FUNC(bp,xfs_buf_error_relse); | |
1026 | XFS_BUF_DONE(bp); | |
b4dd330b | 1027 | XFS_BUF_FINISH_IOWAIT(bp); |
1da177e4 LT |
1028 | } |
1029 | return; | |
1030 | } | |
0b1b213f | 1031 | |
1da177e4 LT |
1032 | xfs_buf_do_callbacks(bp, lip); |
1033 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
1034 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1a1a3e97 | 1035 | xfs_buf_ioend(bp, 0); |
1da177e4 LT |
1036 | } |
1037 | ||
1038 | /* | |
1039 | * This is a callback routine attached to a buffer which gets an error | |
1040 | * when being written out synchronously. | |
1041 | */ | |
1042 | STATIC void | |
1043 | xfs_buf_error_relse( | |
1044 | xfs_buf_t *bp) | |
1045 | { | |
1046 | xfs_log_item_t *lip; | |
1047 | xfs_mount_t *mp; | |
1048 | ||
1049 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
1050 | mp = (xfs_mount_t *)lip->li_mountp; | |
1051 | ASSERT(XFS_BUF_TARGET(bp) == mp->m_ddev_targp); | |
1052 | ||
1053 | XFS_BUF_STALE(bp); | |
1054 | XFS_BUF_DONE(bp); | |
1055 | XFS_BUF_UNDELAYWRITE(bp); | |
1056 | XFS_BUF_ERROR(bp,0); | |
0b1b213f CH |
1057 | |
1058 | trace_xfs_buf_error_relse(bp, _RET_IP_); | |
1059 | ||
1da177e4 | 1060 | if (! XFS_FORCED_SHUTDOWN(mp)) |
7d04a335 | 1061 | xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); |
1da177e4 LT |
1062 | /* |
1063 | * We have to unpin the pinned buffers so do the | |
1064 | * callbacks. | |
1065 | */ | |
1066 | xfs_buf_do_callbacks(bp, lip); | |
1067 | XFS_BUF_SET_FSPRIVATE(bp, NULL); | |
1068 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1069 | XFS_BUF_SET_BRELSE_FUNC(bp,NULL); | |
1070 | xfs_buf_relse(bp); | |
1071 | } | |
1072 | ||
1073 | ||
1074 | /* | |
1075 | * This is the iodone() function for buffers which have been | |
1076 | * logged. It is called when they are eventually flushed out. | |
1077 | * It should remove the buf item from the AIL, and free the buf item. | |
1078 | * It is called by xfs_buf_iodone_callbacks() above which will take | |
1079 | * care of cleaning up the buffer itself. | |
1080 | */ | |
1da177e4 LT |
1081 | void |
1082 | xfs_buf_iodone( | |
ca30b2a7 CH |
1083 | struct xfs_buf *bp, |
1084 | struct xfs_log_item *lip) | |
1da177e4 | 1085 | { |
ca30b2a7 | 1086 | struct xfs_ail *ailp = lip->li_ailp; |
1da177e4 | 1087 | |
ca30b2a7 | 1088 | ASSERT(BUF_ITEM(lip)->bli_buf == bp); |
1da177e4 | 1089 | |
e1f5dbd7 | 1090 | xfs_buf_rele(bp); |
1da177e4 LT |
1091 | |
1092 | /* | |
1093 | * If we are forcibly shutting down, this may well be | |
1094 | * off the AIL already. That's because we simulate the | |
1095 | * log-committed callbacks to unpin these buffers. Or we may never | |
1096 | * have put this item on AIL because of the transaction was | |
783a2f65 | 1097 | * aborted forcibly. xfs_trans_ail_delete() takes care of these. |
1da177e4 LT |
1098 | * |
1099 | * Either way, AIL is useless if we're forcing a shutdown. | |
1100 | */ | |
fc1829f3 | 1101 | spin_lock(&ailp->xa_lock); |
ca30b2a7 CH |
1102 | xfs_trans_ail_delete(ailp, lip); |
1103 | xfs_buf_item_free(BUF_ITEM(lip)); | |
1da177e4 | 1104 | } |