Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2002,2005 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 LT |
25 | #include "xfs_sb.h" |
26 | #include "xfs_ag.h" | |
1da177e4 | 27 | #include "xfs_mount.h" |
a844f451 NS |
28 | #include "xfs_bmap_btree.h" |
29 | #include "xfs_alloc_btree.h" | |
30 | #include "xfs_ialloc_btree.h" | |
a844f451 NS |
31 | #include "xfs_dinode.h" |
32 | #include "xfs_inode.h" | |
33 | #include "xfs_buf_item.h" | |
1da177e4 LT |
34 | #include "xfs_trans_priv.h" |
35 | #include "xfs_error.h" | |
36 | #include "xfs_rw.h" | |
0b1b213f | 37 | #include "xfs_trace.h" |
1da177e4 | 38 | |
4a5224d7 CH |
39 | /* |
40 | * Check to see if a buffer matching the given parameters is already | |
41 | * a part of the given transaction. | |
42 | */ | |
43 | STATIC struct xfs_buf * | |
44 | xfs_trans_buf_item_match( | |
45 | struct xfs_trans *tp, | |
46 | struct xfs_buftarg *target, | |
47 | xfs_daddr_t blkno, | |
48 | int len) | |
49 | { | |
e98c414f CH |
50 | struct xfs_log_item_desc *lidp; |
51 | struct xfs_buf_log_item *blip; | |
1da177e4 | 52 | |
4a5224d7 | 53 | len = BBTOB(len); |
e98c414f CH |
54 | list_for_each_entry(lidp, &tp->t_items, lid_trans) { |
55 | blip = (struct xfs_buf_log_item *)lidp->lid_item; | |
56 | if (blip->bli_item.li_type == XFS_LI_BUF && | |
49074c06 | 57 | blip->bli_buf->b_target == target && |
e98c414f | 58 | XFS_BUF_ADDR(blip->bli_buf) == blkno && |
aa0e8833 | 59 | BBTOB(blip->bli_buf->b_length) == len) |
e98c414f | 60 | return blip->bli_buf; |
4a5224d7 CH |
61 | } |
62 | ||
63 | return NULL; | |
64 | } | |
1da177e4 | 65 | |
d7e84f41 CH |
66 | /* |
67 | * Add the locked buffer to the transaction. | |
68 | * | |
69 | * The buffer must be locked, and it cannot be associated with any | |
70 | * transaction. | |
71 | * | |
72 | * If the buffer does not yet have a buf log item associated with it, | |
73 | * then allocate one for it. Then add the buf item to the transaction. | |
74 | */ | |
75 | STATIC void | |
76 | _xfs_trans_bjoin( | |
77 | struct xfs_trans *tp, | |
78 | struct xfs_buf *bp, | |
79 | int reset_recur) | |
80 | { | |
81 | struct xfs_buf_log_item *bip; | |
82 | ||
bf9d9013 | 83 | ASSERT(bp->b_transp == NULL); |
d7e84f41 CH |
84 | |
85 | /* | |
86 | * The xfs_buf_log_item pointer is stored in b_fsprivate. If | |
87 | * it doesn't have one yet, then allocate one and initialize it. | |
88 | * The checks to see if one is there are in xfs_buf_item_init(). | |
89 | */ | |
90 | xfs_buf_item_init(bp, tp->t_mountp); | |
adadbeef | 91 | bip = bp->b_fspriv; |
d7e84f41 | 92 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); |
c1155410 | 93 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL)); |
d7e84f41 CH |
94 | ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED)); |
95 | if (reset_recur) | |
96 | bip->bli_recur = 0; | |
97 | ||
98 | /* | |
99 | * Take a reference for this transaction on the buf item. | |
100 | */ | |
101 | atomic_inc(&bip->bli_refcount); | |
102 | ||
103 | /* | |
104 | * Get a log_item_desc to point at the new item. | |
105 | */ | |
e98c414f | 106 | xfs_trans_add_item(tp, &bip->bli_item); |
d7e84f41 CH |
107 | |
108 | /* | |
109 | * Initialize b_fsprivate2 so we can find it with incore_match() | |
110 | * in xfs_trans_get_buf() and friends above. | |
111 | */ | |
bf9d9013 | 112 | bp->b_transp = tp; |
d7e84f41 CH |
113 | |
114 | } | |
115 | ||
116 | void | |
117 | xfs_trans_bjoin( | |
118 | struct xfs_trans *tp, | |
119 | struct xfs_buf *bp) | |
120 | { | |
121 | _xfs_trans_bjoin(tp, bp, 0); | |
122 | trace_xfs_trans_bjoin(bp->b_fspriv); | |
123 | } | |
1da177e4 LT |
124 | |
125 | /* | |
126 | * Get and lock the buffer for the caller if it is not already | |
127 | * locked within the given transaction. If it is already locked | |
128 | * within the transaction, just increment its lock recursion count | |
129 | * and return a pointer to it. | |
130 | * | |
1da177e4 LT |
131 | * If the transaction pointer is NULL, make this just a normal |
132 | * get_buf() call. | |
133 | */ | |
134 | xfs_buf_t * | |
135 | xfs_trans_get_buf(xfs_trans_t *tp, | |
136 | xfs_buftarg_t *target_dev, | |
137 | xfs_daddr_t blkno, | |
138 | int len, | |
139 | uint flags) | |
140 | { | |
141 | xfs_buf_t *bp; | |
142 | xfs_buf_log_item_t *bip; | |
143 | ||
144 | if (flags == 0) | |
a8acad70 | 145 | flags = XBF_MAPPED; |
1da177e4 LT |
146 | |
147 | /* | |
148 | * Default to a normal get_buf() call if the tp is NULL. | |
149 | */ | |
6ad112bf | 150 | if (tp == NULL) |
aa5c158e | 151 | return xfs_buf_get(target_dev, blkno, len, flags); |
1da177e4 LT |
152 | |
153 | /* | |
154 | * If we find the buffer in the cache with this transaction | |
155 | * pointer in its b_fsprivate2 field, then we know we already | |
156 | * have it locked. In this case we just increment the lock | |
157 | * recursion count and return the buffer to the caller. | |
158 | */ | |
4a5224d7 | 159 | bp = xfs_trans_buf_item_match(tp, target_dev, blkno, len); |
1da177e4 | 160 | if (bp != NULL) { |
0c842ad4 | 161 | ASSERT(xfs_buf_islocked(bp)); |
c867cb61 CH |
162 | if (XFS_FORCED_SHUTDOWN(tp->t_mountp)) { |
163 | xfs_buf_stale(bp); | |
c867cb61 CH |
164 | XFS_BUF_DONE(bp); |
165 | } | |
0b1b213f | 166 | |
bf9d9013 | 167 | ASSERT(bp->b_transp == tp); |
adadbeef | 168 | bip = bp->b_fspriv; |
1da177e4 LT |
169 | ASSERT(bip != NULL); |
170 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
171 | bip->bli_recur++; | |
0b1b213f | 172 | trace_xfs_trans_get_buf_recur(bip); |
1da177e4 LT |
173 | return (bp); |
174 | } | |
175 | ||
aa5c158e | 176 | bp = xfs_buf_get(target_dev, blkno, len, flags); |
1da177e4 LT |
177 | if (bp == NULL) { |
178 | return NULL; | |
179 | } | |
180 | ||
5a52c2a5 | 181 | ASSERT(!bp->b_error); |
1da177e4 | 182 | |
d7e84f41 CH |
183 | _xfs_trans_bjoin(tp, bp, 1); |
184 | trace_xfs_trans_get_buf(bp->b_fspriv); | |
1da177e4 LT |
185 | return (bp); |
186 | } | |
187 | ||
188 | /* | |
189 | * Get and lock the superblock buffer of this file system for the | |
190 | * given transaction. | |
191 | * | |
192 | * We don't need to use incore_match() here, because the superblock | |
193 | * buffer is a private buffer which we keep a pointer to in the | |
194 | * mount structure. | |
195 | */ | |
196 | xfs_buf_t * | |
197 | xfs_trans_getsb(xfs_trans_t *tp, | |
198 | struct xfs_mount *mp, | |
199 | int flags) | |
200 | { | |
201 | xfs_buf_t *bp; | |
202 | xfs_buf_log_item_t *bip; | |
203 | ||
204 | /* | |
205 | * Default to just trying to lock the superblock buffer | |
206 | * if tp is NULL. | |
207 | */ | |
208 | if (tp == NULL) { | |
209 | return (xfs_getsb(mp, flags)); | |
210 | } | |
211 | ||
212 | /* | |
213 | * If the superblock buffer already has this transaction | |
214 | * pointer in its b_fsprivate2 field, then we know we already | |
215 | * have it locked. In this case we just increment the lock | |
216 | * recursion count and return the buffer to the caller. | |
217 | */ | |
218 | bp = mp->m_sb_bp; | |
bf9d9013 | 219 | if (bp->b_transp == tp) { |
adadbeef | 220 | bip = bp->b_fspriv; |
1da177e4 LT |
221 | ASSERT(bip != NULL); |
222 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
223 | bip->bli_recur++; | |
0b1b213f | 224 | trace_xfs_trans_getsb_recur(bip); |
1da177e4 LT |
225 | return (bp); |
226 | } | |
227 | ||
228 | bp = xfs_getsb(mp, flags); | |
d7e84f41 | 229 | if (bp == NULL) |
1da177e4 | 230 | return NULL; |
1da177e4 | 231 | |
d7e84f41 CH |
232 | _xfs_trans_bjoin(tp, bp, 1); |
233 | trace_xfs_trans_getsb(bp->b_fspriv); | |
1da177e4 LT |
234 | return (bp); |
235 | } | |
236 | ||
237 | #ifdef DEBUG | |
238 | xfs_buftarg_t *xfs_error_target; | |
239 | int xfs_do_error; | |
240 | int xfs_req_num; | |
241 | int xfs_error_mod = 33; | |
242 | #endif | |
243 | ||
244 | /* | |
245 | * Get and lock the buffer for the caller if it is not already | |
246 | * locked within the given transaction. If it has not yet been | |
247 | * read in, read it from disk. If it is already locked | |
248 | * within the transaction and already read in, just increment its | |
249 | * lock recursion count and return a pointer to it. | |
250 | * | |
1da177e4 LT |
251 | * If the transaction pointer is NULL, make this just a normal |
252 | * read_buf() call. | |
253 | */ | |
254 | int | |
255 | xfs_trans_read_buf( | |
256 | xfs_mount_t *mp, | |
257 | xfs_trans_t *tp, | |
258 | xfs_buftarg_t *target, | |
259 | xfs_daddr_t blkno, | |
260 | int len, | |
261 | uint flags, | |
262 | xfs_buf_t **bpp) | |
263 | { | |
264 | xfs_buf_t *bp; | |
265 | xfs_buf_log_item_t *bip; | |
266 | int error; | |
267 | ||
7ca790a5 DC |
268 | *bpp = NULL; |
269 | ||
1da177e4 | 270 | if (flags == 0) |
a8acad70 | 271 | flags = XBF_MAPPED; |
1da177e4 LT |
272 | |
273 | /* | |
274 | * Default to a normal get_buf() call if the tp is NULL. | |
275 | */ | |
276 | if (tp == NULL) { | |
aa5c158e | 277 | bp = xfs_buf_read(target, blkno, len, flags); |
1da177e4 | 278 | if (!bp) |
0cadda1c | 279 | return (flags & XBF_TRYLOCK) ? |
a3f74ffb | 280 | EAGAIN : XFS_ERROR(ENOMEM); |
1da177e4 | 281 | |
5a52c2a5 CS |
282 | if (bp->b_error) { |
283 | error = bp->b_error; | |
901796af | 284 | xfs_buf_ioerror_alert(bp, __func__); |
7ca790a5 DC |
285 | XFS_BUF_UNDONE(bp); |
286 | xfs_buf_stale(bp); | |
1da177e4 LT |
287 | xfs_buf_relse(bp); |
288 | return error; | |
289 | } | |
290 | #ifdef DEBUG | |
a0f7bfd3 | 291 | if (xfs_do_error) { |
1da177e4 LT |
292 | if (xfs_error_target == target) { |
293 | if (((xfs_req_num++) % xfs_error_mod) == 0) { | |
294 | xfs_buf_relse(bp); | |
0b932ccc | 295 | xfs_debug(mp, "Returning error!"); |
1da177e4 LT |
296 | return XFS_ERROR(EIO); |
297 | } | |
298 | } | |
299 | } | |
300 | #endif | |
301 | if (XFS_FORCED_SHUTDOWN(mp)) | |
302 | goto shutdown_abort; | |
303 | *bpp = bp; | |
304 | return 0; | |
305 | } | |
306 | ||
307 | /* | |
308 | * If we find the buffer in the cache with this transaction | |
309 | * pointer in its b_fsprivate2 field, then we know we already | |
310 | * have it locked. If it is already read in we just increment | |
311 | * the lock recursion count and return the buffer to the caller. | |
312 | * If the buffer is not yet read in, then we read it in, increment | |
313 | * the lock recursion count, and return it to the caller. | |
314 | */ | |
4a5224d7 | 315 | bp = xfs_trans_buf_item_match(tp, target, blkno, len); |
1da177e4 | 316 | if (bp != NULL) { |
0c842ad4 | 317 | ASSERT(xfs_buf_islocked(bp)); |
bf9d9013 | 318 | ASSERT(bp->b_transp == tp); |
adadbeef | 319 | ASSERT(bp->b_fspriv != NULL); |
5a52c2a5 | 320 | ASSERT(!bp->b_error); |
1da177e4 | 321 | if (!(XFS_BUF_ISDONE(bp))) { |
0b1b213f | 322 | trace_xfs_trans_read_buf_io(bp, _RET_IP_); |
1da177e4 LT |
323 | ASSERT(!XFS_BUF_ISASYNC(bp)); |
324 | XFS_BUF_READ(bp); | |
325 | xfsbdstrat(tp->t_mountp, bp); | |
1a1a3e97 | 326 | error = xfs_buf_iowait(bp); |
d64e31a2 | 327 | if (error) { |
901796af | 328 | xfs_buf_ioerror_alert(bp, __func__); |
1da177e4 LT |
329 | xfs_buf_relse(bp); |
330 | /* | |
d64e31a2 DC |
331 | * We can gracefully recover from most read |
332 | * errors. Ones we can't are those that happen | |
333 | * after the transaction's already dirty. | |
1da177e4 LT |
334 | */ |
335 | if (tp->t_flags & XFS_TRANS_DIRTY) | |
336 | xfs_force_shutdown(tp->t_mountp, | |
7d04a335 | 337 | SHUTDOWN_META_IO_ERROR); |
1da177e4 LT |
338 | return error; |
339 | } | |
340 | } | |
341 | /* | |
342 | * We never locked this buf ourselves, so we shouldn't | |
343 | * brelse it either. Just get out. | |
344 | */ | |
345 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
0b1b213f | 346 | trace_xfs_trans_read_buf_shut(bp, _RET_IP_); |
1da177e4 LT |
347 | *bpp = NULL; |
348 | return XFS_ERROR(EIO); | |
349 | } | |
350 | ||
351 | ||
adadbeef | 352 | bip = bp->b_fspriv; |
1da177e4 LT |
353 | bip->bli_recur++; |
354 | ||
355 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
0b1b213f | 356 | trace_xfs_trans_read_buf_recur(bip); |
1da177e4 LT |
357 | *bpp = bp; |
358 | return 0; | |
359 | } | |
360 | ||
aa5c158e | 361 | bp = xfs_buf_read(target, blkno, len, flags); |
1da177e4 LT |
362 | if (bp == NULL) { |
363 | *bpp = NULL; | |
7401aafd DC |
364 | return (flags & XBF_TRYLOCK) ? |
365 | 0 : XFS_ERROR(ENOMEM); | |
1da177e4 | 366 | } |
5a52c2a5 CS |
367 | if (bp->b_error) { |
368 | error = bp->b_error; | |
c867cb61 | 369 | xfs_buf_stale(bp); |
c867cb61 | 370 | XFS_BUF_DONE(bp); |
901796af | 371 | xfs_buf_ioerror_alert(bp, __func__); |
1da177e4 | 372 | if (tp->t_flags & XFS_TRANS_DIRTY) |
7d04a335 | 373 | xfs_force_shutdown(tp->t_mountp, SHUTDOWN_META_IO_ERROR); |
1da177e4 LT |
374 | xfs_buf_relse(bp); |
375 | return error; | |
376 | } | |
377 | #ifdef DEBUG | |
378 | if (xfs_do_error && !(tp->t_flags & XFS_TRANS_DIRTY)) { | |
379 | if (xfs_error_target == target) { | |
380 | if (((xfs_req_num++) % xfs_error_mod) == 0) { | |
381 | xfs_force_shutdown(tp->t_mountp, | |
7d04a335 | 382 | SHUTDOWN_META_IO_ERROR); |
1da177e4 | 383 | xfs_buf_relse(bp); |
0b932ccc | 384 | xfs_debug(mp, "Returning trans error!"); |
1da177e4 LT |
385 | return XFS_ERROR(EIO); |
386 | } | |
387 | } | |
388 | } | |
389 | #endif | |
390 | if (XFS_FORCED_SHUTDOWN(mp)) | |
391 | goto shutdown_abort; | |
392 | ||
d7e84f41 CH |
393 | _xfs_trans_bjoin(tp, bp, 1); |
394 | trace_xfs_trans_read_buf(bp->b_fspriv); | |
1da177e4 | 395 | |
1da177e4 LT |
396 | *bpp = bp; |
397 | return 0; | |
398 | ||
399 | shutdown_abort: | |
0b1b213f | 400 | trace_xfs_trans_read_buf_shut(bp, _RET_IP_); |
1da177e4 LT |
401 | xfs_buf_relse(bp); |
402 | *bpp = NULL; | |
403 | return XFS_ERROR(EIO); | |
404 | } | |
405 | ||
406 | ||
407 | /* | |
408 | * Release the buffer bp which was previously acquired with one of the | |
409 | * xfs_trans_... buffer allocation routines if the buffer has not | |
410 | * been modified within this transaction. If the buffer is modified | |
411 | * within this transaction, do decrement the recursion count but do | |
412 | * not release the buffer even if the count goes to 0. If the buffer is not | |
413 | * modified within the transaction, decrement the recursion count and | |
414 | * release the buffer if the recursion count goes to 0. | |
415 | * | |
416 | * If the buffer is to be released and it was not modified before | |
417 | * this transaction began, then free the buf_log_item associated with it. | |
418 | * | |
419 | * If the transaction pointer is NULL, make this just a normal | |
420 | * brelse() call. | |
421 | */ | |
422 | void | |
423 | xfs_trans_brelse(xfs_trans_t *tp, | |
424 | xfs_buf_t *bp) | |
425 | { | |
426 | xfs_buf_log_item_t *bip; | |
1da177e4 LT |
427 | |
428 | /* | |
429 | * Default to a normal brelse() call if the tp is NULL. | |
430 | */ | |
431 | if (tp == NULL) { | |
bf9d9013 | 432 | ASSERT(bp->b_transp == NULL); |
1da177e4 LT |
433 | xfs_buf_relse(bp); |
434 | return; | |
435 | } | |
436 | ||
bf9d9013 | 437 | ASSERT(bp->b_transp == tp); |
adadbeef | 438 | bip = bp->b_fspriv; |
1da177e4 LT |
439 | ASSERT(bip->bli_item.li_type == XFS_LI_BUF); |
440 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
c1155410 | 441 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL)); |
1da177e4 LT |
442 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
443 | ||
0b1b213f CH |
444 | trace_xfs_trans_brelse(bip); |
445 | ||
1da177e4 LT |
446 | /* |
447 | * If the release is just for a recursive lock, | |
448 | * then decrement the count and return. | |
449 | */ | |
450 | if (bip->bli_recur > 0) { | |
451 | bip->bli_recur--; | |
1da177e4 LT |
452 | return; |
453 | } | |
454 | ||
455 | /* | |
456 | * If the buffer is dirty within this transaction, we can't | |
457 | * release it until we commit. | |
458 | */ | |
e98c414f | 459 | if (bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY) |
1da177e4 | 460 | return; |
1da177e4 LT |
461 | |
462 | /* | |
463 | * If the buffer has been invalidated, then we can't release | |
464 | * it until the transaction commits to disk unless it is re-dirtied | |
465 | * as part of this transaction. This prevents us from pulling | |
466 | * the item from the AIL before we should. | |
467 | */ | |
0b1b213f | 468 | if (bip->bli_flags & XFS_BLI_STALE) |
1da177e4 | 469 | return; |
1da177e4 LT |
470 | |
471 | ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED)); | |
1da177e4 LT |
472 | |
473 | /* | |
474 | * Free up the log item descriptor tracking the released item. | |
475 | */ | |
e98c414f | 476 | xfs_trans_del_item(&bip->bli_item); |
1da177e4 LT |
477 | |
478 | /* | |
479 | * Clear the hold flag in the buf log item if it is set. | |
480 | * We wouldn't want the next user of the buffer to | |
481 | * get confused. | |
482 | */ | |
483 | if (bip->bli_flags & XFS_BLI_HOLD) { | |
484 | bip->bli_flags &= ~XFS_BLI_HOLD; | |
485 | } | |
486 | ||
487 | /* | |
488 | * Drop our reference to the buf log item. | |
489 | */ | |
490 | atomic_dec(&bip->bli_refcount); | |
491 | ||
492 | /* | |
493 | * If the buf item is not tracking data in the log, then | |
494 | * we must free it before releasing the buffer back to the | |
495 | * free pool. Before releasing the buffer to the free pool, | |
496 | * clear the transaction pointer in b_fsprivate2 to dissolve | |
497 | * its relation to this transaction. | |
498 | */ | |
499 | if (!xfs_buf_item_dirty(bip)) { | |
500 | /*** | |
501 | ASSERT(bp->b_pincount == 0); | |
502 | ***/ | |
503 | ASSERT(atomic_read(&bip->bli_refcount) == 0); | |
504 | ASSERT(!(bip->bli_item.li_flags & XFS_LI_IN_AIL)); | |
505 | ASSERT(!(bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF)); | |
506 | xfs_buf_item_relse(bp); | |
1da177e4 LT |
507 | } |
508 | ||
5b03ff1b | 509 | bp->b_transp = NULL; |
1da177e4 | 510 | xfs_buf_relse(bp); |
1da177e4 LT |
511 | } |
512 | ||
1da177e4 LT |
513 | /* |
514 | * Mark the buffer as not needing to be unlocked when the buf item's | |
515 | * IOP_UNLOCK() routine is called. The buffer must already be locked | |
516 | * and associated with the given transaction. | |
517 | */ | |
518 | /* ARGSUSED */ | |
519 | void | |
520 | xfs_trans_bhold(xfs_trans_t *tp, | |
521 | xfs_buf_t *bp) | |
522 | { | |
adadbeef | 523 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
1da177e4 | 524 | |
bf9d9013 | 525 | ASSERT(bp->b_transp == tp); |
adadbeef | 526 | ASSERT(bip != NULL); |
1da177e4 | 527 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); |
c1155410 | 528 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL)); |
1da177e4 | 529 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
adadbeef | 530 | |
1da177e4 | 531 | bip->bli_flags |= XFS_BLI_HOLD; |
0b1b213f | 532 | trace_xfs_trans_bhold(bip); |
1da177e4 LT |
533 | } |
534 | ||
efa092f3 TS |
535 | /* |
536 | * Cancel the previous buffer hold request made on this buffer | |
537 | * for this transaction. | |
538 | */ | |
539 | void | |
540 | xfs_trans_bhold_release(xfs_trans_t *tp, | |
541 | xfs_buf_t *bp) | |
542 | { | |
adadbeef | 543 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
efa092f3 | 544 | |
bf9d9013 | 545 | ASSERT(bp->b_transp == tp); |
adadbeef | 546 | ASSERT(bip != NULL); |
efa092f3 | 547 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); |
c1155410 | 548 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL)); |
efa092f3 TS |
549 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
550 | ASSERT(bip->bli_flags & XFS_BLI_HOLD); | |
0b1b213f | 551 | |
adadbeef | 552 | bip->bli_flags &= ~XFS_BLI_HOLD; |
0b1b213f | 553 | trace_xfs_trans_bhold_release(bip); |
efa092f3 TS |
554 | } |
555 | ||
1da177e4 LT |
556 | /* |
557 | * This is called to mark bytes first through last inclusive of the given | |
558 | * buffer as needing to be logged when the transaction is committed. | |
559 | * The buffer must already be associated with the given transaction. | |
560 | * | |
561 | * First and last are numbers relative to the beginning of this buffer, | |
562 | * so the first byte in the buffer is numbered 0 regardless of the | |
563 | * value of b_blkno. | |
564 | */ | |
565 | void | |
566 | xfs_trans_log_buf(xfs_trans_t *tp, | |
567 | xfs_buf_t *bp, | |
568 | uint first, | |
569 | uint last) | |
570 | { | |
adadbeef | 571 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
1da177e4 | 572 | |
bf9d9013 | 573 | ASSERT(bp->b_transp == tp); |
adadbeef | 574 | ASSERT(bip != NULL); |
aa0e8833 | 575 | ASSERT(first <= last && last < BBTOB(bp->b_length)); |
cb669ca5 CH |
576 | ASSERT(bp->b_iodone == NULL || |
577 | bp->b_iodone == xfs_buf_iodone_callbacks); | |
1da177e4 LT |
578 | |
579 | /* | |
580 | * Mark the buffer as needing to be written out eventually, | |
581 | * and set its iodone function to remove the buffer's buf log | |
582 | * item from the AIL and free it when the buffer is flushed | |
583 | * to disk. See xfs_buf_attach_iodone() for more details | |
584 | * on li_cb and xfs_buf_iodone_callbacks(). | |
585 | * If we end up aborting this transaction, we trap this buffer | |
586 | * inside the b_bdstrat callback so that this won't get written to | |
587 | * disk. | |
588 | */ | |
1da177e4 LT |
589 | XFS_BUF_DONE(bp); |
590 | ||
1da177e4 | 591 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
cb669ca5 | 592 | bp->b_iodone = xfs_buf_iodone_callbacks; |
ca30b2a7 | 593 | bip->bli_item.li_cb = xfs_buf_iodone; |
1da177e4 | 594 | |
0b1b213f CH |
595 | trace_xfs_trans_log_buf(bip); |
596 | ||
1da177e4 LT |
597 | /* |
598 | * If we invalidated the buffer within this transaction, then | |
599 | * cancel the invalidation now that we're dirtying the buffer | |
600 | * again. There are no races with the code in xfs_buf_item_unpin(), | |
601 | * because we have a reference to the buffer this entire time. | |
602 | */ | |
603 | if (bip->bli_flags & XFS_BLI_STALE) { | |
1da177e4 LT |
604 | bip->bli_flags &= ~XFS_BLI_STALE; |
605 | ASSERT(XFS_BUF_ISSTALE(bp)); | |
606 | XFS_BUF_UNSTALE(bp); | |
c1155410 | 607 | bip->bli_format.blf_flags &= ~XFS_BLF_CANCEL; |
1da177e4 LT |
608 | } |
609 | ||
1da177e4 | 610 | tp->t_flags |= XFS_TRANS_DIRTY; |
e98c414f | 611 | bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY; |
1da177e4 LT |
612 | bip->bli_flags |= XFS_BLI_LOGGED; |
613 | xfs_buf_item_log(bip, first, last); | |
1da177e4 LT |
614 | } |
615 | ||
616 | ||
617 | /* | |
43ff2122 CH |
618 | * Invalidate a buffer that is being used within a transaction. |
619 | * | |
620 | * Typically this is because the blocks in the buffer are being freed, so we | |
621 | * need to prevent it from being written out when we're done. Allowing it | |
622 | * to be written again might overwrite data in the free blocks if they are | |
623 | * reallocated to a file. | |
1da177e4 | 624 | * |
43ff2122 CH |
625 | * We prevent the buffer from being written out by marking it stale. We can't |
626 | * get rid of the buf log item at this point because the buffer may still be | |
627 | * pinned by another transaction. If that is the case, then we'll wait until | |
628 | * the buffer is committed to disk for the last time (we can tell by the ref | |
629 | * count) and free it in xfs_buf_item_unpin(). Until that happens we will | |
630 | * keep the buffer locked so that the buffer and buf log item are not reused. | |
631 | * | |
632 | * We also set the XFS_BLF_CANCEL flag in the buf log format structure and log | |
633 | * the buf item. This will be used at recovery time to determine that copies | |
634 | * of the buffer in the log before this should not be replayed. | |
635 | * | |
636 | * We mark the item descriptor and the transaction dirty so that we'll hold | |
637 | * the buffer until after the commit. | |
638 | * | |
639 | * Since we're invalidating the buffer, we also clear the state about which | |
640 | * parts of the buffer have been logged. We also clear the flag indicating | |
641 | * that this is an inode buffer since the data in the buffer will no longer | |
642 | * be valid. | |
643 | * | |
644 | * We set the stale bit in the buffer as well since we're getting rid of it. | |
1da177e4 LT |
645 | */ |
646 | void | |
647 | xfs_trans_binval( | |
648 | xfs_trans_t *tp, | |
649 | xfs_buf_t *bp) | |
650 | { | |
adadbeef | 651 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
1da177e4 | 652 | |
bf9d9013 | 653 | ASSERT(bp->b_transp == tp); |
adadbeef | 654 | ASSERT(bip != NULL); |
1da177e4 LT |
655 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
656 | ||
0b1b213f CH |
657 | trace_xfs_trans_binval(bip); |
658 | ||
1da177e4 LT |
659 | if (bip->bli_flags & XFS_BLI_STALE) { |
660 | /* | |
661 | * If the buffer is already invalidated, then | |
662 | * just return. | |
663 | */ | |
1da177e4 LT |
664 | ASSERT(XFS_BUF_ISSTALE(bp)); |
665 | ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY))); | |
c1155410 DC |
666 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_INODE_BUF)); |
667 | ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL); | |
e98c414f | 668 | ASSERT(bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY); |
1da177e4 | 669 | ASSERT(tp->t_flags & XFS_TRANS_DIRTY); |
1da177e4 LT |
670 | return; |
671 | } | |
672 | ||
c867cb61 | 673 | xfs_buf_stale(bp); |
43ff2122 | 674 | |
1da177e4 | 675 | bip->bli_flags |= XFS_BLI_STALE; |
ccf7c23f | 676 | bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY); |
c1155410 DC |
677 | bip->bli_format.blf_flags &= ~XFS_BLF_INODE_BUF; |
678 | bip->bli_format.blf_flags |= XFS_BLF_CANCEL; | |
1da177e4 LT |
679 | memset((char *)(bip->bli_format.blf_data_map), 0, |
680 | (bip->bli_format.blf_map_size * sizeof(uint))); | |
e98c414f | 681 | bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY; |
1da177e4 | 682 | tp->t_flags |= XFS_TRANS_DIRTY; |
1da177e4 LT |
683 | } |
684 | ||
685 | /* | |
ccf7c23f DC |
686 | * This call is used to indicate that the buffer contains on-disk inodes which |
687 | * must be handled specially during recovery. They require special handling | |
688 | * because only the di_next_unlinked from the inodes in the buffer should be | |
689 | * recovered. The rest of the data in the buffer is logged via the inodes | |
690 | * themselves. | |
1da177e4 | 691 | * |
ccf7c23f DC |
692 | * All we do is set the XFS_BLI_INODE_BUF flag in the items flags so it can be |
693 | * transferred to the buffer's log format structure so that we'll know what to | |
694 | * do at recovery time. | |
1da177e4 | 695 | */ |
1da177e4 LT |
696 | void |
697 | xfs_trans_inode_buf( | |
698 | xfs_trans_t *tp, | |
699 | xfs_buf_t *bp) | |
700 | { | |
adadbeef | 701 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
1da177e4 | 702 | |
bf9d9013 | 703 | ASSERT(bp->b_transp == tp); |
adadbeef | 704 | ASSERT(bip != NULL); |
1da177e4 LT |
705 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
706 | ||
ccf7c23f | 707 | bip->bli_flags |= XFS_BLI_INODE_BUF; |
1da177e4 LT |
708 | } |
709 | ||
710 | /* | |
711 | * This call is used to indicate that the buffer is going to | |
712 | * be staled and was an inode buffer. This means it gets | |
713 | * special processing during unpin - where any inodes | |
714 | * associated with the buffer should be removed from ail. | |
715 | * There is also special processing during recovery, | |
716 | * any replay of the inodes in the buffer needs to be | |
717 | * prevented as the buffer may have been reused. | |
718 | */ | |
719 | void | |
720 | xfs_trans_stale_inode_buf( | |
721 | xfs_trans_t *tp, | |
722 | xfs_buf_t *bp) | |
723 | { | |
adadbeef | 724 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
1da177e4 | 725 | |
bf9d9013 | 726 | ASSERT(bp->b_transp == tp); |
adadbeef | 727 | ASSERT(bip != NULL); |
1da177e4 LT |
728 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
729 | ||
730 | bip->bli_flags |= XFS_BLI_STALE_INODE; | |
ca30b2a7 | 731 | bip->bli_item.li_cb = xfs_buf_iodone; |
1da177e4 LT |
732 | } |
733 | ||
1da177e4 LT |
734 | /* |
735 | * Mark the buffer as being one which contains newly allocated | |
736 | * inodes. We need to make sure that even if this buffer is | |
737 | * relogged as an 'inode buf' we still recover all of the inode | |
738 | * images in the face of a crash. This works in coordination with | |
739 | * xfs_buf_item_committed() to ensure that the buffer remains in the | |
740 | * AIL at its original location even after it has been relogged. | |
741 | */ | |
742 | /* ARGSUSED */ | |
743 | void | |
744 | xfs_trans_inode_alloc_buf( | |
745 | xfs_trans_t *tp, | |
746 | xfs_buf_t *bp) | |
747 | { | |
adadbeef | 748 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
1da177e4 | 749 | |
bf9d9013 | 750 | ASSERT(bp->b_transp == tp); |
adadbeef | 751 | ASSERT(bip != NULL); |
1da177e4 LT |
752 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
753 | ||
754 | bip->bli_flags |= XFS_BLI_INODE_ALLOC_BUF; | |
755 | } | |
756 | ||
757 | ||
758 | /* | |
759 | * Similar to xfs_trans_inode_buf(), this marks the buffer as a cluster of | |
760 | * dquots. However, unlike in inode buffer recovery, dquot buffers get | |
761 | * recovered in their entirety. (Hence, no XFS_BLI_DQUOT_ALLOC_BUF flag). | |
762 | * The only thing that makes dquot buffers different from regular | |
763 | * buffers is that we must not replay dquot bufs when recovering | |
764 | * if a _corresponding_ quotaoff has happened. We also have to distinguish | |
765 | * between usr dquot bufs and grp dquot bufs, because usr and grp quotas | |
766 | * can be turned off independently. | |
767 | */ | |
768 | /* ARGSUSED */ | |
769 | void | |
770 | xfs_trans_dquot_buf( | |
771 | xfs_trans_t *tp, | |
772 | xfs_buf_t *bp, | |
773 | uint type) | |
774 | { | |
adadbeef | 775 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
1da177e4 | 776 | |
bf9d9013 | 777 | ASSERT(bp->b_transp == tp); |
adadbeef | 778 | ASSERT(bip != NULL); |
c1155410 DC |
779 | ASSERT(type == XFS_BLF_UDQUOT_BUF || |
780 | type == XFS_BLF_PDQUOT_BUF || | |
781 | type == XFS_BLF_GDQUOT_BUF); | |
1da177e4 LT |
782 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
783 | ||
784 | bip->bli_format.blf_flags |= type; | |
785 | } |