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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
1da177e4 | 32 | #include "xfs.h" |
a844f451 | 33 | #include "xfs_fs.h" |
1da177e4 | 34 | #include "xfs_types.h" |
a844f451 | 35 | #include "xfs_bit.h" |
1da177e4 | 36 | #include "xfs_log.h" |
a844f451 | 37 | #include "xfs_inum.h" |
1da177e4 | 38 | #include "xfs_trans.h" |
1da177e4 LT |
39 | #include "xfs_sb.h" |
40 | #include "xfs_ag.h" | |
41 | #include "xfs_dir.h" | |
a844f451 | 42 | #include "xfs_dir2.h" |
1da177e4 LT |
43 | #include "xfs_dmapi.h" |
44 | #include "xfs_mount.h" | |
a844f451 NS |
45 | #include "xfs_bmap_btree.h" |
46 | #include "xfs_alloc_btree.h" | |
47 | #include "xfs_ialloc_btree.h" | |
48 | #include "xfs_dir_sf.h" | |
49 | #include "xfs_dir2_sf.h" | |
50 | #include "xfs_attr_sf.h" | |
51 | #include "xfs_dinode.h" | |
52 | #include "xfs_inode.h" | |
53 | #include "xfs_buf_item.h" | |
1da177e4 LT |
54 | #include "xfs_trans_priv.h" |
55 | #include "xfs_error.h" | |
56 | #include "xfs_rw.h" | |
57 | ||
58 | ||
59 | STATIC xfs_buf_t *xfs_trans_buf_item_match(xfs_trans_t *, xfs_buftarg_t *, | |
60 | xfs_daddr_t, int); | |
61 | STATIC xfs_buf_t *xfs_trans_buf_item_match_all(xfs_trans_t *, xfs_buftarg_t *, | |
62 | xfs_daddr_t, int); | |
63 | ||
64 | ||
65 | /* | |
66 | * Get and lock the buffer for the caller if it is not already | |
67 | * locked within the given transaction. If it is already locked | |
68 | * within the transaction, just increment its lock recursion count | |
69 | * and return a pointer to it. | |
70 | * | |
71 | * Use the fast path function xfs_trans_buf_item_match() or the buffer | |
72 | * cache routine incore_match() to find the buffer | |
73 | * if it is already owned by this transaction. | |
74 | * | |
75 | * If we don't already own the buffer, use get_buf() to get it. | |
76 | * If it doesn't yet have an associated xfs_buf_log_item structure, | |
77 | * then allocate one and add the item to this transaction. | |
78 | * | |
79 | * If the transaction pointer is NULL, make this just a normal | |
80 | * get_buf() call. | |
81 | */ | |
82 | xfs_buf_t * | |
83 | xfs_trans_get_buf(xfs_trans_t *tp, | |
84 | xfs_buftarg_t *target_dev, | |
85 | xfs_daddr_t blkno, | |
86 | int len, | |
87 | uint flags) | |
88 | { | |
89 | xfs_buf_t *bp; | |
90 | xfs_buf_log_item_t *bip; | |
91 | ||
92 | if (flags == 0) | |
93 | flags = XFS_BUF_LOCK | XFS_BUF_MAPPED; | |
94 | ||
95 | /* | |
96 | * Default to a normal get_buf() call if the tp is NULL. | |
97 | */ | |
98 | if (tp == NULL) { | |
99 | bp = xfs_buf_get_flags(target_dev, blkno, len, | |
100 | flags | BUF_BUSY); | |
101 | return(bp); | |
102 | } | |
103 | ||
104 | /* | |
105 | * If we find the buffer in the cache with this transaction | |
106 | * pointer in its b_fsprivate2 field, then we know we already | |
107 | * have it locked. In this case we just increment the lock | |
108 | * recursion count and return the buffer to the caller. | |
109 | */ | |
110 | if (tp->t_items.lic_next == NULL) { | |
111 | bp = xfs_trans_buf_item_match(tp, target_dev, blkno, len); | |
112 | } else { | |
113 | bp = xfs_trans_buf_item_match_all(tp, target_dev, blkno, len); | |
114 | } | |
115 | if (bp != NULL) { | |
116 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
117 | if (XFS_FORCED_SHUTDOWN(tp->t_mountp)) { | |
118 | xfs_buftrace("TRANS GET RECUR SHUT", bp); | |
119 | XFS_BUF_SUPER_STALE(bp); | |
120 | } | |
121 | /* | |
122 | * If the buffer is stale then it was binval'ed | |
123 | * since last read. This doesn't matter since the | |
124 | * caller isn't allowed to use the data anyway. | |
125 | */ | |
126 | else if (XFS_BUF_ISSTALE(bp)) { | |
127 | xfs_buftrace("TRANS GET RECUR STALE", bp); | |
128 | ASSERT(!XFS_BUF_ISDELAYWRITE(bp)); | |
129 | } | |
130 | ASSERT(XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp); | |
131 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *); | |
132 | ASSERT(bip != NULL); | |
133 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
134 | bip->bli_recur++; | |
135 | xfs_buftrace("TRANS GET RECUR", bp); | |
136 | xfs_buf_item_trace("GET RECUR", bip); | |
137 | return (bp); | |
138 | } | |
139 | ||
140 | /* | |
141 | * We always specify the BUF_BUSY flag within a transaction so | |
142 | * that get_buf does not try to push out a delayed write buffer | |
143 | * which might cause another transaction to take place (if the | |
144 | * buffer was delayed alloc). Such recursive transactions can | |
145 | * easily deadlock with our current transaction as well as cause | |
146 | * us to run out of stack space. | |
147 | */ | |
148 | bp = xfs_buf_get_flags(target_dev, blkno, len, flags | BUF_BUSY); | |
149 | if (bp == NULL) { | |
150 | return NULL; | |
151 | } | |
152 | ||
153 | ASSERT(!XFS_BUF_GETERROR(bp)); | |
154 | ||
155 | /* | |
156 | * The xfs_buf_log_item pointer is stored in b_fsprivate. If | |
157 | * it doesn't have one yet, then allocate one and initialize it. | |
158 | * The checks to see if one is there are in xfs_buf_item_init(). | |
159 | */ | |
160 | xfs_buf_item_init(bp, tp->t_mountp); | |
161 | ||
162 | /* | |
163 | * Set the recursion count for the buffer within this transaction | |
164 | * to 0. | |
165 | */ | |
166 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); | |
167 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
168 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLI_CANCEL)); | |
169 | ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED)); | |
170 | bip->bli_recur = 0; | |
171 | ||
172 | /* | |
173 | * Take a reference for this transaction on the buf item. | |
174 | */ | |
175 | atomic_inc(&bip->bli_refcount); | |
176 | ||
177 | /* | |
178 | * Get a log_item_desc to point at the new item. | |
179 | */ | |
180 | (void) xfs_trans_add_item(tp, (xfs_log_item_t*)bip); | |
181 | ||
182 | /* | |
183 | * Initialize b_fsprivate2 so we can find it with incore_match() | |
184 | * above. | |
185 | */ | |
186 | XFS_BUF_SET_FSPRIVATE2(bp, tp); | |
187 | ||
188 | xfs_buftrace("TRANS GET", bp); | |
189 | xfs_buf_item_trace("GET", bip); | |
190 | return (bp); | |
191 | } | |
192 | ||
193 | /* | |
194 | * Get and lock the superblock buffer of this file system for the | |
195 | * given transaction. | |
196 | * | |
197 | * We don't need to use incore_match() here, because the superblock | |
198 | * buffer is a private buffer which we keep a pointer to in the | |
199 | * mount structure. | |
200 | */ | |
201 | xfs_buf_t * | |
202 | xfs_trans_getsb(xfs_trans_t *tp, | |
203 | struct xfs_mount *mp, | |
204 | int flags) | |
205 | { | |
206 | xfs_buf_t *bp; | |
207 | xfs_buf_log_item_t *bip; | |
208 | ||
209 | /* | |
210 | * Default to just trying to lock the superblock buffer | |
211 | * if tp is NULL. | |
212 | */ | |
213 | if (tp == NULL) { | |
214 | return (xfs_getsb(mp, flags)); | |
215 | } | |
216 | ||
217 | /* | |
218 | * If the superblock buffer already has this transaction | |
219 | * pointer in its b_fsprivate2 field, then we know we already | |
220 | * have it locked. In this case we just increment the lock | |
221 | * recursion count and return the buffer to the caller. | |
222 | */ | |
223 | bp = mp->m_sb_bp; | |
224 | if (XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp) { | |
225 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); | |
226 | ASSERT(bip != NULL); | |
227 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
228 | bip->bli_recur++; | |
229 | xfs_buf_item_trace("GETSB RECUR", bip); | |
230 | return (bp); | |
231 | } | |
232 | ||
233 | bp = xfs_getsb(mp, flags); | |
234 | if (bp == NULL) { | |
235 | return NULL; | |
236 | } | |
237 | ||
238 | /* | |
239 | * The xfs_buf_log_item pointer is stored in b_fsprivate. If | |
240 | * it doesn't have one yet, then allocate one and initialize it. | |
241 | * The checks to see if one is there are in xfs_buf_item_init(). | |
242 | */ | |
243 | xfs_buf_item_init(bp, mp); | |
244 | ||
245 | /* | |
246 | * Set the recursion count for the buffer within this transaction | |
247 | * to 0. | |
248 | */ | |
249 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); | |
250 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
251 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLI_CANCEL)); | |
252 | ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED)); | |
253 | bip->bli_recur = 0; | |
254 | ||
255 | /* | |
256 | * Take a reference for this transaction on the buf item. | |
257 | */ | |
258 | atomic_inc(&bip->bli_refcount); | |
259 | ||
260 | /* | |
261 | * Get a log_item_desc to point at the new item. | |
262 | */ | |
263 | (void) xfs_trans_add_item(tp, (xfs_log_item_t*)bip); | |
264 | ||
265 | /* | |
266 | * Initialize b_fsprivate2 so we can find it with incore_match() | |
267 | * above. | |
268 | */ | |
269 | XFS_BUF_SET_FSPRIVATE2(bp, tp); | |
270 | ||
271 | xfs_buf_item_trace("GETSB", bip); | |
272 | return (bp); | |
273 | } | |
274 | ||
275 | #ifdef DEBUG | |
276 | xfs_buftarg_t *xfs_error_target; | |
277 | int xfs_do_error; | |
278 | int xfs_req_num; | |
279 | int xfs_error_mod = 33; | |
280 | #endif | |
281 | ||
282 | /* | |
283 | * Get and lock the buffer for the caller if it is not already | |
284 | * locked within the given transaction. If it has not yet been | |
285 | * read in, read it from disk. If it is already locked | |
286 | * within the transaction and already read in, just increment its | |
287 | * lock recursion count and return a pointer to it. | |
288 | * | |
289 | * Use the fast path function xfs_trans_buf_item_match() or the buffer | |
290 | * cache routine incore_match() to find the buffer | |
291 | * if it is already owned by this transaction. | |
292 | * | |
293 | * If we don't already own the buffer, use read_buf() to get it. | |
294 | * If it doesn't yet have an associated xfs_buf_log_item structure, | |
295 | * then allocate one and add the item to this transaction. | |
296 | * | |
297 | * If the transaction pointer is NULL, make this just a normal | |
298 | * read_buf() call. | |
299 | */ | |
300 | int | |
301 | xfs_trans_read_buf( | |
302 | xfs_mount_t *mp, | |
303 | xfs_trans_t *tp, | |
304 | xfs_buftarg_t *target, | |
305 | xfs_daddr_t blkno, | |
306 | int len, | |
307 | uint flags, | |
308 | xfs_buf_t **bpp) | |
309 | { | |
310 | xfs_buf_t *bp; | |
311 | xfs_buf_log_item_t *bip; | |
312 | int error; | |
313 | ||
314 | if (flags == 0) | |
315 | flags = XFS_BUF_LOCK | XFS_BUF_MAPPED; | |
316 | ||
317 | /* | |
318 | * Default to a normal get_buf() call if the tp is NULL. | |
319 | */ | |
320 | if (tp == NULL) { | |
321 | bp = xfs_buf_read_flags(target, blkno, len, flags | BUF_BUSY); | |
322 | if (!bp) | |
323 | return XFS_ERROR(ENOMEM); | |
324 | ||
325 | if ((bp != NULL) && (XFS_BUF_GETERROR(bp) != 0)) { | |
326 | xfs_ioerror_alert("xfs_trans_read_buf", mp, | |
327 | bp, blkno); | |
328 | error = XFS_BUF_GETERROR(bp); | |
329 | xfs_buf_relse(bp); | |
330 | return error; | |
331 | } | |
332 | #ifdef DEBUG | |
333 | if (xfs_do_error && (bp != NULL)) { | |
334 | if (xfs_error_target == target) { | |
335 | if (((xfs_req_num++) % xfs_error_mod) == 0) { | |
336 | xfs_buf_relse(bp); | |
337 | printk("Returning error!\n"); | |
338 | return XFS_ERROR(EIO); | |
339 | } | |
340 | } | |
341 | } | |
342 | #endif | |
343 | if (XFS_FORCED_SHUTDOWN(mp)) | |
344 | goto shutdown_abort; | |
345 | *bpp = bp; | |
346 | return 0; | |
347 | } | |
348 | ||
349 | /* | |
350 | * If we find the buffer in the cache with this transaction | |
351 | * pointer in its b_fsprivate2 field, then we know we already | |
352 | * have it locked. If it is already read in we just increment | |
353 | * the lock recursion count and return the buffer to the caller. | |
354 | * If the buffer is not yet read in, then we read it in, increment | |
355 | * the lock recursion count, and return it to the caller. | |
356 | */ | |
357 | if (tp->t_items.lic_next == NULL) { | |
358 | bp = xfs_trans_buf_item_match(tp, target, blkno, len); | |
359 | } else { | |
360 | bp = xfs_trans_buf_item_match_all(tp, target, blkno, len); | |
361 | } | |
362 | if (bp != NULL) { | |
363 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
364 | ASSERT(XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp); | |
365 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
366 | ASSERT((XFS_BUF_ISERROR(bp)) == 0); | |
367 | if (!(XFS_BUF_ISDONE(bp))) { | |
368 | xfs_buftrace("READ_BUF_INCORE !DONE", bp); | |
369 | ASSERT(!XFS_BUF_ISASYNC(bp)); | |
370 | XFS_BUF_READ(bp); | |
371 | xfsbdstrat(tp->t_mountp, bp); | |
372 | xfs_iowait(bp); | |
373 | if (XFS_BUF_GETERROR(bp) != 0) { | |
374 | xfs_ioerror_alert("xfs_trans_read_buf", mp, | |
375 | bp, blkno); | |
376 | error = XFS_BUF_GETERROR(bp); | |
377 | xfs_buf_relse(bp); | |
378 | /* | |
379 | * We can gracefully recover from most | |
380 | * read errors. Ones we can't are those | |
381 | * that happen after the transaction's | |
382 | * already dirty. | |
383 | */ | |
384 | if (tp->t_flags & XFS_TRANS_DIRTY) | |
385 | xfs_force_shutdown(tp->t_mountp, | |
386 | XFS_METADATA_IO_ERROR); | |
387 | return error; | |
388 | } | |
389 | } | |
390 | /* | |
391 | * We never locked this buf ourselves, so we shouldn't | |
392 | * brelse it either. Just get out. | |
393 | */ | |
394 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
395 | xfs_buftrace("READ_BUF_INCORE XFSSHUTDN", bp); | |
396 | *bpp = NULL; | |
397 | return XFS_ERROR(EIO); | |
398 | } | |
399 | ||
400 | ||
401 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); | |
402 | bip->bli_recur++; | |
403 | ||
404 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
405 | xfs_buf_item_trace("READ RECUR", bip); | |
406 | *bpp = bp; | |
407 | return 0; | |
408 | } | |
409 | ||
410 | /* | |
411 | * We always specify the BUF_BUSY flag within a transaction so | |
412 | * that get_buf does not try to push out a delayed write buffer | |
413 | * which might cause another transaction to take place (if the | |
414 | * buffer was delayed alloc). Such recursive transactions can | |
415 | * easily deadlock with our current transaction as well as cause | |
416 | * us to run out of stack space. | |
417 | */ | |
418 | bp = xfs_buf_read_flags(target, blkno, len, flags | BUF_BUSY); | |
419 | if (bp == NULL) { | |
420 | *bpp = NULL; | |
421 | return 0; | |
422 | } | |
423 | if (XFS_BUF_GETERROR(bp) != 0) { | |
424 | XFS_BUF_SUPER_STALE(bp); | |
425 | xfs_buftrace("READ ERROR", bp); | |
426 | error = XFS_BUF_GETERROR(bp); | |
427 | ||
428 | xfs_ioerror_alert("xfs_trans_read_buf", mp, | |
429 | bp, blkno); | |
430 | if (tp->t_flags & XFS_TRANS_DIRTY) | |
431 | xfs_force_shutdown(tp->t_mountp, XFS_METADATA_IO_ERROR); | |
432 | xfs_buf_relse(bp); | |
433 | return error; | |
434 | } | |
435 | #ifdef DEBUG | |
436 | if (xfs_do_error && !(tp->t_flags & XFS_TRANS_DIRTY)) { | |
437 | if (xfs_error_target == target) { | |
438 | if (((xfs_req_num++) % xfs_error_mod) == 0) { | |
439 | xfs_force_shutdown(tp->t_mountp, | |
440 | XFS_METADATA_IO_ERROR); | |
441 | xfs_buf_relse(bp); | |
442 | printk("Returning error in trans!\n"); | |
443 | return XFS_ERROR(EIO); | |
444 | } | |
445 | } | |
446 | } | |
447 | #endif | |
448 | if (XFS_FORCED_SHUTDOWN(mp)) | |
449 | goto shutdown_abort; | |
450 | ||
451 | /* | |
452 | * The xfs_buf_log_item pointer is stored in b_fsprivate. If | |
453 | * it doesn't have one yet, then allocate one and initialize it. | |
454 | * The checks to see if one is there are in xfs_buf_item_init(). | |
455 | */ | |
456 | xfs_buf_item_init(bp, tp->t_mountp); | |
457 | ||
458 | /* | |
459 | * Set the recursion count for the buffer within this transaction | |
460 | * to 0. | |
461 | */ | |
462 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t*); | |
463 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
464 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLI_CANCEL)); | |
465 | ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED)); | |
466 | bip->bli_recur = 0; | |
467 | ||
468 | /* | |
469 | * Take a reference for this transaction on the buf item. | |
470 | */ | |
471 | atomic_inc(&bip->bli_refcount); | |
472 | ||
473 | /* | |
474 | * Get a log_item_desc to point at the new item. | |
475 | */ | |
476 | (void) xfs_trans_add_item(tp, (xfs_log_item_t*)bip); | |
477 | ||
478 | /* | |
479 | * Initialize b_fsprivate2 so we can find it with incore_match() | |
480 | * above. | |
481 | */ | |
482 | XFS_BUF_SET_FSPRIVATE2(bp, tp); | |
483 | ||
484 | xfs_buftrace("TRANS READ", bp); | |
485 | xfs_buf_item_trace("READ", bip); | |
486 | *bpp = bp; | |
487 | return 0; | |
488 | ||
489 | shutdown_abort: | |
490 | /* | |
491 | * the theory here is that buffer is good but we're | |
492 | * bailing out because the filesystem is being forcibly | |
493 | * shut down. So we should leave the b_flags alone since | |
494 | * the buffer's not staled and just get out. | |
495 | */ | |
496 | #if defined(DEBUG) | |
497 | if (XFS_BUF_ISSTALE(bp) && XFS_BUF_ISDELAYWRITE(bp)) | |
498 | cmn_err(CE_NOTE, "about to pop assert, bp == 0x%p", bp); | |
499 | #endif | |
500 | ASSERT((XFS_BUF_BFLAGS(bp) & (XFS_B_STALE|XFS_B_DELWRI)) != | |
501 | (XFS_B_STALE|XFS_B_DELWRI)); | |
502 | ||
503 | xfs_buftrace("READ_BUF XFSSHUTDN", bp); | |
504 | xfs_buf_relse(bp); | |
505 | *bpp = NULL; | |
506 | return XFS_ERROR(EIO); | |
507 | } | |
508 | ||
509 | ||
510 | /* | |
511 | * Release the buffer bp which was previously acquired with one of the | |
512 | * xfs_trans_... buffer allocation routines if the buffer has not | |
513 | * been modified within this transaction. If the buffer is modified | |
514 | * within this transaction, do decrement the recursion count but do | |
515 | * not release the buffer even if the count goes to 0. If the buffer is not | |
516 | * modified within the transaction, decrement the recursion count and | |
517 | * release the buffer if the recursion count goes to 0. | |
518 | * | |
519 | * If the buffer is to be released and it was not modified before | |
520 | * this transaction began, then free the buf_log_item associated with it. | |
521 | * | |
522 | * If the transaction pointer is NULL, make this just a normal | |
523 | * brelse() call. | |
524 | */ | |
525 | void | |
526 | xfs_trans_brelse(xfs_trans_t *tp, | |
527 | xfs_buf_t *bp) | |
528 | { | |
529 | xfs_buf_log_item_t *bip; | |
530 | xfs_log_item_t *lip; | |
531 | xfs_log_item_desc_t *lidp; | |
532 | ||
533 | /* | |
534 | * Default to a normal brelse() call if the tp is NULL. | |
535 | */ | |
536 | if (tp == NULL) { | |
537 | ASSERT(XFS_BUF_FSPRIVATE2(bp, void *) == NULL); | |
538 | /* | |
539 | * If there's a buf log item attached to the buffer, | |
540 | * then let the AIL know that the buffer is being | |
541 | * unlocked. | |
542 | */ | |
543 | if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) { | |
544 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); | |
545 | if (lip->li_type == XFS_LI_BUF) { | |
546 | bip = XFS_BUF_FSPRIVATE(bp,xfs_buf_log_item_t*); | |
547 | xfs_trans_unlocked_item( | |
548 | bip->bli_item.li_mountp, | |
549 | lip); | |
550 | } | |
551 | } | |
552 | xfs_buf_relse(bp); | |
553 | return; | |
554 | } | |
555 | ||
556 | ASSERT(XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp); | |
557 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *); | |
558 | ASSERT(bip->bli_item.li_type == XFS_LI_BUF); | |
559 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
560 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLI_CANCEL)); | |
561 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
562 | ||
563 | /* | |
564 | * Find the item descriptor pointing to this buffer's | |
565 | * log item. It must be there. | |
566 | */ | |
567 | lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)bip); | |
568 | ASSERT(lidp != NULL); | |
569 | ||
570 | /* | |
571 | * If the release is just for a recursive lock, | |
572 | * then decrement the count and return. | |
573 | */ | |
574 | if (bip->bli_recur > 0) { | |
575 | bip->bli_recur--; | |
576 | xfs_buf_item_trace("RELSE RECUR", bip); | |
577 | return; | |
578 | } | |
579 | ||
580 | /* | |
581 | * If the buffer is dirty within this transaction, we can't | |
582 | * release it until we commit. | |
583 | */ | |
584 | if (lidp->lid_flags & XFS_LID_DIRTY) { | |
585 | xfs_buf_item_trace("RELSE DIRTY", bip); | |
586 | return; | |
587 | } | |
588 | ||
589 | /* | |
590 | * If the buffer has been invalidated, then we can't release | |
591 | * it until the transaction commits to disk unless it is re-dirtied | |
592 | * as part of this transaction. This prevents us from pulling | |
593 | * the item from the AIL before we should. | |
594 | */ | |
595 | if (bip->bli_flags & XFS_BLI_STALE) { | |
596 | xfs_buf_item_trace("RELSE STALE", bip); | |
597 | return; | |
598 | } | |
599 | ||
600 | ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED)); | |
601 | xfs_buf_item_trace("RELSE", bip); | |
602 | ||
603 | /* | |
604 | * Free up the log item descriptor tracking the released item. | |
605 | */ | |
606 | xfs_trans_free_item(tp, lidp); | |
607 | ||
608 | /* | |
609 | * Clear the hold flag in the buf log item if it is set. | |
610 | * We wouldn't want the next user of the buffer to | |
611 | * get confused. | |
612 | */ | |
613 | if (bip->bli_flags & XFS_BLI_HOLD) { | |
614 | bip->bli_flags &= ~XFS_BLI_HOLD; | |
615 | } | |
616 | ||
617 | /* | |
618 | * Drop our reference to the buf log item. | |
619 | */ | |
620 | atomic_dec(&bip->bli_refcount); | |
621 | ||
622 | /* | |
623 | * If the buf item is not tracking data in the log, then | |
624 | * we must free it before releasing the buffer back to the | |
625 | * free pool. Before releasing the buffer to the free pool, | |
626 | * clear the transaction pointer in b_fsprivate2 to dissolve | |
627 | * its relation to this transaction. | |
628 | */ | |
629 | if (!xfs_buf_item_dirty(bip)) { | |
630 | /*** | |
631 | ASSERT(bp->b_pincount == 0); | |
632 | ***/ | |
633 | ASSERT(atomic_read(&bip->bli_refcount) == 0); | |
634 | ASSERT(!(bip->bli_item.li_flags & XFS_LI_IN_AIL)); | |
635 | ASSERT(!(bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF)); | |
636 | xfs_buf_item_relse(bp); | |
637 | bip = NULL; | |
638 | } | |
639 | XFS_BUF_SET_FSPRIVATE2(bp, NULL); | |
640 | ||
641 | /* | |
642 | * If we've still got a buf log item on the buffer, then | |
643 | * tell the AIL that the buffer is being unlocked. | |
644 | */ | |
645 | if (bip != NULL) { | |
646 | xfs_trans_unlocked_item(bip->bli_item.li_mountp, | |
647 | (xfs_log_item_t*)bip); | |
648 | } | |
649 | ||
650 | xfs_buf_relse(bp); | |
651 | return; | |
652 | } | |
653 | ||
654 | /* | |
655 | * Add the locked buffer to the transaction. | |
656 | * The buffer must be locked, and it cannot be associated with any | |
657 | * transaction. | |
658 | * | |
659 | * If the buffer does not yet have a buf log item associated with it, | |
660 | * then allocate one for it. Then add the buf item to the transaction. | |
661 | */ | |
662 | void | |
663 | xfs_trans_bjoin(xfs_trans_t *tp, | |
664 | xfs_buf_t *bp) | |
665 | { | |
666 | xfs_buf_log_item_t *bip; | |
667 | ||
668 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
669 | ASSERT(XFS_BUF_FSPRIVATE2(bp, void *) == NULL); | |
670 | ||
671 | /* | |
672 | * The xfs_buf_log_item pointer is stored in b_fsprivate. If | |
673 | * it doesn't have one yet, then allocate one and initialize it. | |
674 | * The checks to see if one is there are in xfs_buf_item_init(). | |
675 | */ | |
676 | xfs_buf_item_init(bp, tp->t_mountp); | |
677 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *); | |
678 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
679 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLI_CANCEL)); | |
680 | ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED)); | |
681 | ||
682 | /* | |
683 | * Take a reference for this transaction on the buf item. | |
684 | */ | |
685 | atomic_inc(&bip->bli_refcount); | |
686 | ||
687 | /* | |
688 | * Get a log_item_desc to point at the new item. | |
689 | */ | |
690 | (void) xfs_trans_add_item(tp, (xfs_log_item_t *)bip); | |
691 | ||
692 | /* | |
693 | * Initialize b_fsprivate2 so we can find it with incore_match() | |
694 | * in xfs_trans_get_buf() and friends above. | |
695 | */ | |
696 | XFS_BUF_SET_FSPRIVATE2(bp, tp); | |
697 | ||
698 | xfs_buf_item_trace("BJOIN", bip); | |
699 | } | |
700 | ||
701 | /* | |
702 | * Mark the buffer as not needing to be unlocked when the buf item's | |
703 | * IOP_UNLOCK() routine is called. The buffer must already be locked | |
704 | * and associated with the given transaction. | |
705 | */ | |
706 | /* ARGSUSED */ | |
707 | void | |
708 | xfs_trans_bhold(xfs_trans_t *tp, | |
709 | xfs_buf_t *bp) | |
710 | { | |
711 | xfs_buf_log_item_t *bip; | |
712 | ||
713 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
714 | ASSERT(XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp); | |
715 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
716 | ||
717 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *); | |
718 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
719 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLI_CANCEL)); | |
720 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
721 | bip->bli_flags |= XFS_BLI_HOLD; | |
722 | xfs_buf_item_trace("BHOLD", bip); | |
723 | } | |
724 | ||
efa092f3 TS |
725 | /* |
726 | * Cancel the previous buffer hold request made on this buffer | |
727 | * for this transaction. | |
728 | */ | |
729 | void | |
730 | xfs_trans_bhold_release(xfs_trans_t *tp, | |
731 | xfs_buf_t *bp) | |
732 | { | |
733 | xfs_buf_log_item_t *bip; | |
734 | ||
735 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
736 | ASSERT(XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp); | |
737 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
738 | ||
739 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *); | |
740 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); | |
741 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLI_CANCEL)); | |
742 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
743 | ASSERT(bip->bli_flags & XFS_BLI_HOLD); | |
744 | bip->bli_flags &= ~XFS_BLI_HOLD; | |
745 | xfs_buf_item_trace("BHOLD RELEASE", bip); | |
746 | } | |
747 | ||
1da177e4 LT |
748 | /* |
749 | * This is called to mark bytes first through last inclusive of the given | |
750 | * buffer as needing to be logged when the transaction is committed. | |
751 | * The buffer must already be associated with the given transaction. | |
752 | * | |
753 | * First and last are numbers relative to the beginning of this buffer, | |
754 | * so the first byte in the buffer is numbered 0 regardless of the | |
755 | * value of b_blkno. | |
756 | */ | |
757 | void | |
758 | xfs_trans_log_buf(xfs_trans_t *tp, | |
759 | xfs_buf_t *bp, | |
760 | uint first, | |
761 | uint last) | |
762 | { | |
763 | xfs_buf_log_item_t *bip; | |
764 | xfs_log_item_desc_t *lidp; | |
765 | ||
766 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
767 | ASSERT(XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp); | |
768 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
769 | ASSERT((first <= last) && (last < XFS_BUF_COUNT(bp))); | |
770 | ASSERT((XFS_BUF_IODONE_FUNC(bp) == NULL) || | |
771 | (XFS_BUF_IODONE_FUNC(bp) == xfs_buf_iodone_callbacks)); | |
772 | ||
773 | /* | |
774 | * Mark the buffer as needing to be written out eventually, | |
775 | * and set its iodone function to remove the buffer's buf log | |
776 | * item from the AIL and free it when the buffer is flushed | |
777 | * to disk. See xfs_buf_attach_iodone() for more details | |
778 | * on li_cb and xfs_buf_iodone_callbacks(). | |
779 | * If we end up aborting this transaction, we trap this buffer | |
780 | * inside the b_bdstrat callback so that this won't get written to | |
781 | * disk. | |
782 | */ | |
783 | XFS_BUF_DELAYWRITE(bp); | |
784 | XFS_BUF_DONE(bp); | |
785 | ||
786 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *); | |
787 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
788 | XFS_BUF_SET_IODONE_FUNC(bp, xfs_buf_iodone_callbacks); | |
789 | bip->bli_item.li_cb = (void(*)(xfs_buf_t*,xfs_log_item_t*))xfs_buf_iodone; | |
790 | ||
791 | /* | |
792 | * If we invalidated the buffer within this transaction, then | |
793 | * cancel the invalidation now that we're dirtying the buffer | |
794 | * again. There are no races with the code in xfs_buf_item_unpin(), | |
795 | * because we have a reference to the buffer this entire time. | |
796 | */ | |
797 | if (bip->bli_flags & XFS_BLI_STALE) { | |
798 | xfs_buf_item_trace("BLOG UNSTALE", bip); | |
799 | bip->bli_flags &= ~XFS_BLI_STALE; | |
800 | ASSERT(XFS_BUF_ISSTALE(bp)); | |
801 | XFS_BUF_UNSTALE(bp); | |
802 | bip->bli_format.blf_flags &= ~XFS_BLI_CANCEL; | |
803 | } | |
804 | ||
805 | lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)bip); | |
806 | ASSERT(lidp != NULL); | |
807 | ||
808 | tp->t_flags |= XFS_TRANS_DIRTY; | |
809 | lidp->lid_flags |= XFS_LID_DIRTY; | |
810 | lidp->lid_flags &= ~XFS_LID_BUF_STALE; | |
811 | bip->bli_flags |= XFS_BLI_LOGGED; | |
812 | xfs_buf_item_log(bip, first, last); | |
813 | xfs_buf_item_trace("BLOG", bip); | |
814 | } | |
815 | ||
816 | ||
817 | /* | |
818 | * This called to invalidate a buffer that is being used within | |
819 | * a transaction. Typically this is because the blocks in the | |
820 | * buffer are being freed, so we need to prevent it from being | |
821 | * written out when we're done. Allowing it to be written again | |
822 | * might overwrite data in the free blocks if they are reallocated | |
823 | * to a file. | |
824 | * | |
825 | * We prevent the buffer from being written out by clearing the | |
826 | * B_DELWRI flag. We can't always | |
827 | * get rid of the buf log item at this point, though, because | |
828 | * the buffer may still be pinned by another transaction. If that | |
829 | * is the case, then we'll wait until the buffer is committed to | |
830 | * disk for the last time (we can tell by the ref count) and | |
831 | * free it in xfs_buf_item_unpin(). Until it is cleaned up we | |
832 | * will keep the buffer locked so that the buffer and buf log item | |
833 | * are not reused. | |
834 | */ | |
835 | void | |
836 | xfs_trans_binval( | |
837 | xfs_trans_t *tp, | |
838 | xfs_buf_t *bp) | |
839 | { | |
840 | xfs_log_item_desc_t *lidp; | |
841 | xfs_buf_log_item_t *bip; | |
842 | ||
843 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
844 | ASSERT(XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp); | |
845 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
846 | ||
847 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *); | |
848 | lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)bip); | |
849 | ASSERT(lidp != NULL); | |
850 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
851 | ||
852 | if (bip->bli_flags & XFS_BLI_STALE) { | |
853 | /* | |
854 | * If the buffer is already invalidated, then | |
855 | * just return. | |
856 | */ | |
857 | ASSERT(!(XFS_BUF_ISDELAYWRITE(bp))); | |
858 | ASSERT(XFS_BUF_ISSTALE(bp)); | |
859 | ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY))); | |
860 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLI_INODE_BUF)); | |
861 | ASSERT(bip->bli_format.blf_flags & XFS_BLI_CANCEL); | |
862 | ASSERT(lidp->lid_flags & XFS_LID_DIRTY); | |
863 | ASSERT(tp->t_flags & XFS_TRANS_DIRTY); | |
864 | xfs_buftrace("XFS_BINVAL RECUR", bp); | |
865 | xfs_buf_item_trace("BINVAL RECUR", bip); | |
866 | return; | |
867 | } | |
868 | ||
869 | /* | |
870 | * Clear the dirty bit in the buffer and set the STALE flag | |
871 | * in the buf log item. The STALE flag will be used in | |
872 | * xfs_buf_item_unpin() to determine if it should clean up | |
873 | * when the last reference to the buf item is given up. | |
874 | * We set the XFS_BLI_CANCEL flag in the buf log format structure | |
875 | * and log the buf item. This will be used at recovery time | |
876 | * to determine that copies of the buffer in the log before | |
877 | * this should not be replayed. | |
878 | * We mark the item descriptor and the transaction dirty so | |
879 | * that we'll hold the buffer until after the commit. | |
880 | * | |
881 | * Since we're invalidating the buffer, we also clear the state | |
882 | * about which parts of the buffer have been logged. We also | |
883 | * clear the flag indicating that this is an inode buffer since | |
884 | * the data in the buffer will no longer be valid. | |
885 | * | |
886 | * We set the stale bit in the buffer as well since we're getting | |
887 | * rid of it. | |
888 | */ | |
889 | XFS_BUF_UNDELAYWRITE(bp); | |
890 | XFS_BUF_STALE(bp); | |
891 | bip->bli_flags |= XFS_BLI_STALE; | |
892 | bip->bli_flags &= ~(XFS_BLI_LOGGED | XFS_BLI_DIRTY); | |
893 | bip->bli_format.blf_flags &= ~XFS_BLI_INODE_BUF; | |
894 | bip->bli_format.blf_flags |= XFS_BLI_CANCEL; | |
895 | memset((char *)(bip->bli_format.blf_data_map), 0, | |
896 | (bip->bli_format.blf_map_size * sizeof(uint))); | |
897 | lidp->lid_flags |= XFS_LID_DIRTY|XFS_LID_BUF_STALE; | |
898 | tp->t_flags |= XFS_TRANS_DIRTY; | |
899 | xfs_buftrace("XFS_BINVAL", bp); | |
900 | xfs_buf_item_trace("BINVAL", bip); | |
901 | } | |
902 | ||
903 | /* | |
904 | * This call is used to indicate that the buffer contains on-disk | |
905 | * inodes which must be handled specially during recovery. They | |
906 | * require special handling because only the di_next_unlinked from | |
907 | * the inodes in the buffer should be recovered. The rest of the | |
908 | * data in the buffer is logged via the inodes themselves. | |
909 | * | |
910 | * All we do is set the XFS_BLI_INODE_BUF flag in the buffer's log | |
911 | * format structure so that we'll know what to do at recovery time. | |
912 | */ | |
913 | /* ARGSUSED */ | |
914 | void | |
915 | xfs_trans_inode_buf( | |
916 | xfs_trans_t *tp, | |
917 | xfs_buf_t *bp) | |
918 | { | |
919 | xfs_buf_log_item_t *bip; | |
920 | ||
921 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
922 | ASSERT(XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp); | |
923 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
924 | ||
925 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *); | |
926 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
927 | ||
928 | bip->bli_format.blf_flags |= XFS_BLI_INODE_BUF; | |
929 | } | |
930 | ||
931 | /* | |
932 | * This call is used to indicate that the buffer is going to | |
933 | * be staled and was an inode buffer. This means it gets | |
934 | * special processing during unpin - where any inodes | |
935 | * associated with the buffer should be removed from ail. | |
936 | * There is also special processing during recovery, | |
937 | * any replay of the inodes in the buffer needs to be | |
938 | * prevented as the buffer may have been reused. | |
939 | */ | |
940 | void | |
941 | xfs_trans_stale_inode_buf( | |
942 | xfs_trans_t *tp, | |
943 | xfs_buf_t *bp) | |
944 | { | |
945 | xfs_buf_log_item_t *bip; | |
946 | ||
947 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
948 | ASSERT(XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp); | |
949 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
950 | ||
951 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *); | |
952 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
953 | ||
954 | bip->bli_flags |= XFS_BLI_STALE_INODE; | |
955 | bip->bli_item.li_cb = (void(*)(xfs_buf_t*,xfs_log_item_t*)) | |
956 | xfs_buf_iodone; | |
957 | } | |
958 | ||
959 | ||
960 | ||
961 | /* | |
962 | * Mark the buffer as being one which contains newly allocated | |
963 | * inodes. We need to make sure that even if this buffer is | |
964 | * relogged as an 'inode buf' we still recover all of the inode | |
965 | * images in the face of a crash. This works in coordination with | |
966 | * xfs_buf_item_committed() to ensure that the buffer remains in the | |
967 | * AIL at its original location even after it has been relogged. | |
968 | */ | |
969 | /* ARGSUSED */ | |
970 | void | |
971 | xfs_trans_inode_alloc_buf( | |
972 | xfs_trans_t *tp, | |
973 | xfs_buf_t *bp) | |
974 | { | |
975 | xfs_buf_log_item_t *bip; | |
976 | ||
977 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
978 | ASSERT(XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp); | |
979 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
980 | ||
981 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *); | |
982 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
983 | ||
984 | bip->bli_flags |= XFS_BLI_INODE_ALLOC_BUF; | |
985 | } | |
986 | ||
987 | ||
988 | /* | |
989 | * Similar to xfs_trans_inode_buf(), this marks the buffer as a cluster of | |
990 | * dquots. However, unlike in inode buffer recovery, dquot buffers get | |
991 | * recovered in their entirety. (Hence, no XFS_BLI_DQUOT_ALLOC_BUF flag). | |
992 | * The only thing that makes dquot buffers different from regular | |
993 | * buffers is that we must not replay dquot bufs when recovering | |
994 | * if a _corresponding_ quotaoff has happened. We also have to distinguish | |
995 | * between usr dquot bufs and grp dquot bufs, because usr and grp quotas | |
996 | * can be turned off independently. | |
997 | */ | |
998 | /* ARGSUSED */ | |
999 | void | |
1000 | xfs_trans_dquot_buf( | |
1001 | xfs_trans_t *tp, | |
1002 | xfs_buf_t *bp, | |
1003 | uint type) | |
1004 | { | |
1005 | xfs_buf_log_item_t *bip; | |
1006 | ||
1007 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
1008 | ASSERT(XFS_BUF_FSPRIVATE2(bp, xfs_trans_t *) == tp); | |
1009 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); | |
1010 | ASSERT(type == XFS_BLI_UDQUOT_BUF || | |
c8ad20ff | 1011 | type == XFS_BLI_PDQUOT_BUF || |
1da177e4 LT |
1012 | type == XFS_BLI_GDQUOT_BUF); |
1013 | ||
1014 | bip = XFS_BUF_FSPRIVATE(bp, xfs_buf_log_item_t *); | |
1015 | ASSERT(atomic_read(&bip->bli_refcount) > 0); | |
1016 | ||
1017 | bip->bli_format.blf_flags |= type; | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * Check to see if a buffer matching the given parameters is already | |
1022 | * a part of the given transaction. Only check the first, embedded | |
1023 | * chunk, since we don't want to spend all day scanning large transactions. | |
1024 | */ | |
1025 | STATIC xfs_buf_t * | |
1026 | xfs_trans_buf_item_match( | |
1027 | xfs_trans_t *tp, | |
1028 | xfs_buftarg_t *target, | |
1029 | xfs_daddr_t blkno, | |
1030 | int len) | |
1031 | { | |
1032 | xfs_log_item_chunk_t *licp; | |
1033 | xfs_log_item_desc_t *lidp; | |
1034 | xfs_buf_log_item_t *blip; | |
1035 | xfs_buf_t *bp; | |
1036 | int i; | |
1037 | ||
1038 | bp = NULL; | |
1039 | len = BBTOB(len); | |
1040 | licp = &tp->t_items; | |
1041 | if (!XFS_LIC_ARE_ALL_FREE(licp)) { | |
1042 | for (i = 0; i < licp->lic_unused; i++) { | |
1043 | /* | |
1044 | * Skip unoccupied slots. | |
1045 | */ | |
1046 | if (XFS_LIC_ISFREE(licp, i)) { | |
1047 | continue; | |
1048 | } | |
1049 | ||
1050 | lidp = XFS_LIC_SLOT(licp, i); | |
1051 | blip = (xfs_buf_log_item_t *)lidp->lid_item; | |
1052 | if (blip->bli_item.li_type != XFS_LI_BUF) { | |
1053 | continue; | |
1054 | } | |
1055 | ||
1056 | bp = blip->bli_buf; | |
1057 | if ((XFS_BUF_TARGET(bp) == target) && | |
1058 | (XFS_BUF_ADDR(bp) == blkno) && | |
1059 | (XFS_BUF_COUNT(bp) == len)) { | |
1060 | /* | |
1061 | * We found it. Break out and | |
1062 | * return the pointer to the buffer. | |
1063 | */ | |
1064 | break; | |
1065 | } else { | |
1066 | bp = NULL; | |
1067 | } | |
1068 | } | |
1069 | } | |
1070 | return bp; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * Check to see if a buffer matching the given parameters is already | |
1075 | * a part of the given transaction. Check all the chunks, we | |
1076 | * want to be thorough. | |
1077 | */ | |
1078 | STATIC xfs_buf_t * | |
1079 | xfs_trans_buf_item_match_all( | |
1080 | xfs_trans_t *tp, | |
1081 | xfs_buftarg_t *target, | |
1082 | xfs_daddr_t blkno, | |
1083 | int len) | |
1084 | { | |
1085 | xfs_log_item_chunk_t *licp; | |
1086 | xfs_log_item_desc_t *lidp; | |
1087 | xfs_buf_log_item_t *blip; | |
1088 | xfs_buf_t *bp; | |
1089 | int i; | |
1090 | ||
1091 | bp = NULL; | |
1092 | len = BBTOB(len); | |
1093 | for (licp = &tp->t_items; licp != NULL; licp = licp->lic_next) { | |
1094 | if (XFS_LIC_ARE_ALL_FREE(licp)) { | |
1095 | ASSERT(licp == &tp->t_items); | |
1096 | ASSERT(licp->lic_next == NULL); | |
1097 | return NULL; | |
1098 | } | |
1099 | for (i = 0; i < licp->lic_unused; i++) { | |
1100 | /* | |
1101 | * Skip unoccupied slots. | |
1102 | */ | |
1103 | if (XFS_LIC_ISFREE(licp, i)) { | |
1104 | continue; | |
1105 | } | |
1106 | ||
1107 | lidp = XFS_LIC_SLOT(licp, i); | |
1108 | blip = (xfs_buf_log_item_t *)lidp->lid_item; | |
1109 | if (blip->bli_item.li_type != XFS_LI_BUF) { | |
1110 | continue; | |
1111 | } | |
1112 | ||
1113 | bp = blip->bli_buf; | |
1114 | if ((XFS_BUF_TARGET(bp) == target) && | |
1115 | (XFS_BUF_ADDR(bp) == blkno) && | |
1116 | (XFS_BUF_COUNT(bp) == len)) { | |
1117 | /* | |
1118 | * We found it. Break out and | |
1119 | * return the pointer to the buffer. | |
1120 | */ | |
1121 | return bp; | |
1122 | } | |
1123 | } | |
1124 | } | |
1125 | return NULL; | |
1126 | } |