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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110019#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "xfs_types.h"
Nathan Scotta844f452005-11-02 14:38:42 +110021#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110023#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "xfs_trans.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "xfs_dir2.h"
28#include "xfs_dmapi.h"
29#include "xfs_mount.h"
30#include "xfs_error.h"
Nathan Scotta844f452005-11-02 14:38:42 +110031#include "xfs_da_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110033#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "xfs_ialloc_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110035#include "xfs_dir2_sf.h"
36#include "xfs_attr_sf.h"
37#include "xfs_dinode.h"
38#include "xfs_inode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include "xfs_btree.h"
40#include "xfs_ialloc.h"
41#include "xfs_alloc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include "xfs_bmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include "xfs_quota.h"
Nathan Scotta844f452005-11-02 14:38:42 +110044#include "xfs_trans_priv.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include "xfs_trans_space.h"
46
47
48STATIC void xfs_trans_apply_sb_deltas(xfs_trans_t *);
49STATIC uint xfs_trans_count_vecs(xfs_trans_t *);
50STATIC void xfs_trans_fill_vecs(xfs_trans_t *, xfs_log_iovec_t *);
51STATIC void xfs_trans_uncommit(xfs_trans_t *, uint);
52STATIC void xfs_trans_committed(xfs_trans_t *, int);
53STATIC void xfs_trans_chunk_committed(xfs_log_item_chunk_t *, xfs_lsn_t, int);
54STATIC void xfs_trans_free(xfs_trans_t *);
55
Nathan Scott8f794052006-03-14 13:32:41 +110056kmem_zone_t *xfs_trans_zone;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58
59/*
Nathan Scott8f794052006-03-14 13:32:41 +110060 * Reservation functions here avoid a huge stack in xfs_trans_init
61 * due to register overflow from temporaries in the calculations.
62 */
63
64STATIC uint
65xfs_calc_write_reservation(xfs_mount_t *mp)
66{
67 return XFS_CALC_WRITE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
68}
69
70STATIC uint
71xfs_calc_itruncate_reservation(xfs_mount_t *mp)
72{
73 return XFS_CALC_ITRUNCATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
74}
75
76STATIC uint
77xfs_calc_rename_reservation(xfs_mount_t *mp)
78{
79 return XFS_CALC_RENAME_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
80}
81
82STATIC uint
83xfs_calc_link_reservation(xfs_mount_t *mp)
84{
Nathan Scott2ddd5922006-03-17 17:25:46 +110085 return XFS_CALC_LINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
Nathan Scott8f794052006-03-14 13:32:41 +110086}
87
88STATIC uint
89xfs_calc_remove_reservation(xfs_mount_t *mp)
90{
91 return XFS_CALC_REMOVE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
92}
93
94STATIC uint
95xfs_calc_symlink_reservation(xfs_mount_t *mp)
96{
97 return XFS_CALC_SYMLINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
98}
99
100STATIC uint
101xfs_calc_create_reservation(xfs_mount_t *mp)
102{
103 return XFS_CALC_CREATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
104}
105
106STATIC uint
107xfs_calc_mkdir_reservation(xfs_mount_t *mp)
108{
109 return XFS_CALC_MKDIR_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
110}
111
112STATIC uint
113xfs_calc_ifree_reservation(xfs_mount_t *mp)
114{
115 return XFS_CALC_IFREE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
116}
117
118STATIC uint
119xfs_calc_ichange_reservation(xfs_mount_t *mp)
120{
121 return XFS_CALC_ICHANGE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
122}
123
124STATIC uint
125xfs_calc_growdata_reservation(xfs_mount_t *mp)
126{
127 return XFS_CALC_GROWDATA_LOG_RES(mp);
128}
129
130STATIC uint
131xfs_calc_growrtalloc_reservation(xfs_mount_t *mp)
132{
133 return XFS_CALC_GROWRTALLOC_LOG_RES(mp);
134}
135
136STATIC uint
137xfs_calc_growrtzero_reservation(xfs_mount_t *mp)
138{
139 return XFS_CALC_GROWRTZERO_LOG_RES(mp);
140}
141
142STATIC uint
143xfs_calc_growrtfree_reservation(xfs_mount_t *mp)
144{
145 return XFS_CALC_GROWRTFREE_LOG_RES(mp);
146}
147
148STATIC uint
149xfs_calc_swrite_reservation(xfs_mount_t *mp)
150{
151 return XFS_CALC_SWRITE_LOG_RES(mp);
152}
153
154STATIC uint
155xfs_calc_writeid_reservation(xfs_mount_t *mp)
156{
157 return XFS_CALC_WRITEID_LOG_RES(mp);
158}
159
160STATIC uint
161xfs_calc_addafork_reservation(xfs_mount_t *mp)
162{
163 return XFS_CALC_ADDAFORK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
164}
165
166STATIC uint
167xfs_calc_attrinval_reservation(xfs_mount_t *mp)
168{
169 return XFS_CALC_ATTRINVAL_LOG_RES(mp);
170}
171
172STATIC uint
173xfs_calc_attrset_reservation(xfs_mount_t *mp)
174{
175 return XFS_CALC_ATTRSET_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
176}
177
178STATIC uint
179xfs_calc_attrrm_reservation(xfs_mount_t *mp)
180{
181 return XFS_CALC_ATTRRM_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
182}
183
184STATIC uint
185xfs_calc_clear_agi_bucket_reservation(xfs_mount_t *mp)
186{
187 return XFS_CALC_CLEAR_AGI_BUCKET_LOG_RES(mp);
188}
189
190/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 * Initialize the precomputed transaction reservation values
192 * in the mount structure.
193 */
194void
195xfs_trans_init(
196 xfs_mount_t *mp)
197{
198 xfs_trans_reservations_t *resp;
199
200 resp = &(mp->m_reservations);
Nathan Scott8f794052006-03-14 13:32:41 +1100201 resp->tr_write = xfs_calc_write_reservation(mp);
202 resp->tr_itruncate = xfs_calc_itruncate_reservation(mp);
203 resp->tr_rename = xfs_calc_rename_reservation(mp);
204 resp->tr_link = xfs_calc_link_reservation(mp);
205 resp->tr_remove = xfs_calc_remove_reservation(mp);
206 resp->tr_symlink = xfs_calc_symlink_reservation(mp);
207 resp->tr_create = xfs_calc_create_reservation(mp);
208 resp->tr_mkdir = xfs_calc_mkdir_reservation(mp);
209 resp->tr_ifree = xfs_calc_ifree_reservation(mp);
210 resp->tr_ichange = xfs_calc_ichange_reservation(mp);
211 resp->tr_growdata = xfs_calc_growdata_reservation(mp);
212 resp->tr_swrite = xfs_calc_swrite_reservation(mp);
213 resp->tr_writeid = xfs_calc_writeid_reservation(mp);
214 resp->tr_addafork = xfs_calc_addafork_reservation(mp);
215 resp->tr_attrinval = xfs_calc_attrinval_reservation(mp);
216 resp->tr_attrset = xfs_calc_attrset_reservation(mp);
217 resp->tr_attrrm = xfs_calc_attrrm_reservation(mp);
218 resp->tr_clearagi = xfs_calc_clear_agi_bucket_reservation(mp);
219 resp->tr_growrtalloc = xfs_calc_growrtalloc_reservation(mp);
220 resp->tr_growrtzero = xfs_calc_growrtzero_reservation(mp);
221 resp->tr_growrtfree = xfs_calc_growrtfree_reservation(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222}
223
224/*
225 * This routine is called to allocate a transaction structure.
226 * The type parameter indicates the type of the transaction. These
227 * are enumerated in xfs_trans.h.
228 *
229 * Dynamically allocate the transaction structure from the transaction
230 * zone, initialize it, and return it to the caller.
231 */
232xfs_trans_t *
233xfs_trans_alloc(
234 xfs_mount_t *mp,
235 uint type)
236{
Nathan Scott34327e12006-06-09 17:11:55 +1000237 vfs_wait_for_freeze(XFS_MTOVFS(mp), SB_FREEZE_TRANS);
238 return _xfs_trans_alloc(mp, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239}
240
241xfs_trans_t *
242_xfs_trans_alloc(
243 xfs_mount_t *mp,
244 uint type)
245{
246 xfs_trans_t *tp;
247
Nathan Scott34327e12006-06-09 17:11:55 +1000248 atomic_inc(&mp->m_active_trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Nathan Scott34327e12006-06-09 17:11:55 +1000250 tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 tp->t_magic = XFS_TRANS_MAGIC;
252 tp->t_type = type;
253 tp->t_mountp = mp;
254 tp->t_items_free = XFS_LIC_NUM_SLOTS;
255 tp->t_busy_free = XFS_LBC_NUM_SLOTS;
256 XFS_LIC_INIT(&(tp->t_items));
257 XFS_LBC_INIT(&(tp->t_busy));
Nathan Scott34327e12006-06-09 17:11:55 +1000258 return tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
260
261/*
262 * This is called to create a new transaction which will share the
263 * permanent log reservation of the given transaction. The remaining
264 * unused block and rt extent reservations are also inherited. This
265 * implies that the original transaction is no longer allowed to allocate
266 * blocks. Locks and log items, however, are no inherited. They must
267 * be added to the new transaction explicitly.
268 */
269xfs_trans_t *
270xfs_trans_dup(
271 xfs_trans_t *tp)
272{
273 xfs_trans_t *ntp;
274
275 ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
276
277 /*
278 * Initialize the new transaction structure.
279 */
280 ntp->t_magic = XFS_TRANS_MAGIC;
281 ntp->t_type = tp->t_type;
282 ntp->t_mountp = tp->t_mountp;
283 ntp->t_items_free = XFS_LIC_NUM_SLOTS;
284 ntp->t_busy_free = XFS_LBC_NUM_SLOTS;
285 XFS_LIC_INIT(&(ntp->t_items));
286 XFS_LBC_INIT(&(ntp->t_busy));
287
288 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 ASSERT(tp->t_ticket != NULL);
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 ntp->t_flags = XFS_TRANS_PERM_LOG_RES | (tp->t_flags & XFS_TRANS_RESERVE);
292 ntp->t_ticket = tp->t_ticket;
293 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
294 tp->t_blk_res = tp->t_blk_res_used;
295 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
296 tp->t_rtx_res = tp->t_rtx_res_used;
Nathan Scott59c1b082006-06-09 14:59:13 +1000297 ntp->t_pflags = tp->t_pflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299 XFS_TRANS_DUP_DQINFO(tp->t_mountp, tp, ntp);
300
301 atomic_inc(&tp->t_mountp->m_active_trans);
302 return ntp;
303}
304
305/*
306 * This is called to reserve free disk blocks and log space for the
307 * given transaction. This must be done before allocating any resources
308 * within the transaction.
309 *
310 * This will return ENOSPC if there are not enough blocks available.
311 * It will sleep waiting for available log space.
312 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
313 * is used by long running transactions. If any one of the reservations
314 * fails then they will all be backed out.
315 *
316 * This does not do quota reservations. That typically is done by the
317 * caller afterwards.
318 */
319int
320xfs_trans_reserve(
321 xfs_trans_t *tp,
322 uint blocks,
323 uint logspace,
324 uint rtextents,
325 uint flags,
326 uint logcount)
327{
328 int log_flags;
Nathan Scott59c1b082006-06-09 14:59:13 +1000329 int error = 0;
330 int rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332 /* Mark this thread as being in a transaction */
Nathan Scott59c1b082006-06-09 14:59:13 +1000333 current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335 /*
336 * Attempt to reserve the needed disk blocks by decrementing
337 * the number needed from the number available. This will
338 * fail if the count would go below zero.
339 */
340 if (blocks > 0) {
341 error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS,
David Chinner20f4ebf2007-02-10 18:36:10 +1100342 -((int64_t)blocks), rsvd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 if (error != 0) {
Nathan Scott59c1b082006-06-09 14:59:13 +1000344 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 return (XFS_ERROR(ENOSPC));
346 }
347 tp->t_blk_res += blocks;
348 }
349
350 /*
351 * Reserve the log space needed for this transaction.
352 */
353 if (logspace > 0) {
354 ASSERT((tp->t_log_res == 0) || (tp->t_log_res == logspace));
355 ASSERT((tp->t_log_count == 0) ||
356 (tp->t_log_count == logcount));
357 if (flags & XFS_TRANS_PERM_LOG_RES) {
358 log_flags = XFS_LOG_PERM_RESERV;
359 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
360 } else {
361 ASSERT(tp->t_ticket == NULL);
362 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
363 log_flags = 0;
364 }
365
366 error = xfs_log_reserve(tp->t_mountp, logspace, logcount,
367 &tp->t_ticket,
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000368 XFS_TRANSACTION, log_flags, tp->t_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 if (error) {
370 goto undo_blocks;
371 }
372 tp->t_log_res = logspace;
373 tp->t_log_count = logcount;
374 }
375
376 /*
377 * Attempt to reserve the needed realtime extents by decrementing
378 * the number needed from the number available. This will
379 * fail if the count would go below zero.
380 */
381 if (rtextents > 0) {
382 error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS,
David Chinner20f4ebf2007-02-10 18:36:10 +1100383 -((int64_t)rtextents), rsvd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 if (error) {
385 error = XFS_ERROR(ENOSPC);
386 goto undo_log;
387 }
388 tp->t_rtx_res += rtextents;
389 }
390
391 return 0;
392
393 /*
394 * Error cases jump to one of these labels to undo any
395 * reservations which have already been performed.
396 */
397undo_log:
398 if (logspace > 0) {
399 if (flags & XFS_TRANS_PERM_LOG_RES) {
400 log_flags = XFS_LOG_REL_PERM_RESERV;
401 } else {
402 log_flags = 0;
403 }
404 xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags);
405 tp->t_ticket = NULL;
406 tp->t_log_res = 0;
407 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
408 }
409
410undo_blocks:
411 if (blocks > 0) {
412 (void) xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS,
David Chinner20f4ebf2007-02-10 18:36:10 +1100413 (int64_t)blocks, rsvd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 tp->t_blk_res = 0;
415 }
416
Nathan Scott59c1b082006-06-09 14:59:13 +1000417 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
Nathan Scott59c1b082006-06-09 14:59:13 +1000419 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420}
421
422
423/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 * Record the indicated change to the given field for application
425 * to the file system's superblock when the transaction commits.
426 * For now, just store the change in the transaction structure.
427 *
428 * Mark the transaction structure to indicate that the superblock
429 * needs to be updated before committing.
430 */
431void
432xfs_trans_mod_sb(
433 xfs_trans_t *tp,
434 uint field,
David Chinner20f4ebf2007-02-10 18:36:10 +1100435 int64_t delta)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436{
437
438 switch (field) {
439 case XFS_TRANS_SB_ICOUNT:
440 tp->t_icount_delta += delta;
441 break;
442 case XFS_TRANS_SB_IFREE:
443 tp->t_ifree_delta += delta;
444 break;
445 case XFS_TRANS_SB_FDBLOCKS:
446 /*
447 * Track the number of blocks allocated in the
448 * transaction. Make sure it does not exceed the
449 * number reserved.
450 */
451 if (delta < 0) {
452 tp->t_blk_res_used += (uint)-delta;
453 ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
454 }
455 tp->t_fdblocks_delta += delta;
456 break;
457 case XFS_TRANS_SB_RES_FDBLOCKS:
458 /*
459 * The allocation has already been applied to the
460 * in-core superblock's counter. This should only
461 * be applied to the on-disk superblock.
462 */
463 ASSERT(delta < 0);
464 tp->t_res_fdblocks_delta += delta;
465 break;
466 case XFS_TRANS_SB_FREXTENTS:
467 /*
468 * Track the number of blocks allocated in the
469 * transaction. Make sure it does not exceed the
470 * number reserved.
471 */
472 if (delta < 0) {
473 tp->t_rtx_res_used += (uint)-delta;
474 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
475 }
476 tp->t_frextents_delta += delta;
477 break;
478 case XFS_TRANS_SB_RES_FREXTENTS:
479 /*
480 * The allocation has already been applied to the
Nathan Scottc41564b2006-03-29 08:55:14 +1000481 * in-core superblock's counter. This should only
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 * be applied to the on-disk superblock.
483 */
484 ASSERT(delta < 0);
485 tp->t_res_frextents_delta += delta;
486 break;
487 case XFS_TRANS_SB_DBLOCKS:
488 ASSERT(delta > 0);
489 tp->t_dblocks_delta += delta;
490 break;
491 case XFS_TRANS_SB_AGCOUNT:
492 ASSERT(delta > 0);
493 tp->t_agcount_delta += delta;
494 break;
495 case XFS_TRANS_SB_IMAXPCT:
496 tp->t_imaxpct_delta += delta;
497 break;
498 case XFS_TRANS_SB_REXTSIZE:
499 tp->t_rextsize_delta += delta;
500 break;
501 case XFS_TRANS_SB_RBMBLOCKS:
502 tp->t_rbmblocks_delta += delta;
503 break;
504 case XFS_TRANS_SB_RBLOCKS:
505 tp->t_rblocks_delta += delta;
506 break;
507 case XFS_TRANS_SB_REXTENTS:
508 tp->t_rextents_delta += delta;
509 break;
510 case XFS_TRANS_SB_REXTSLOG:
511 tp->t_rextslog_delta += delta;
512 break;
513 default:
514 ASSERT(0);
515 return;
516 }
517
518 tp->t_flags |= (XFS_TRANS_SB_DIRTY | XFS_TRANS_DIRTY);
519}
520
521/*
522 * xfs_trans_apply_sb_deltas() is called from the commit code
523 * to bring the superblock buffer into the current transaction
524 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
525 *
526 * For now we just look at each field allowed to change and change
527 * it if necessary.
528 */
529STATIC void
530xfs_trans_apply_sb_deltas(
531 xfs_trans_t *tp)
532{
533 xfs_sb_t *sbp;
534 xfs_buf_t *bp;
535 int whole = 0;
536
537 bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
538 sbp = XFS_BUF_TO_SBP(bp);
539
540 /*
541 * Check that superblock mods match the mods made to AGF counters.
542 */
543 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
544 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
545 tp->t_ag_btree_delta));
546
547 if (tp->t_icount_delta != 0) {
548 INT_MOD(sbp->sb_icount, ARCH_CONVERT, tp->t_icount_delta);
549 }
550 if (tp->t_ifree_delta != 0) {
551 INT_MOD(sbp->sb_ifree, ARCH_CONVERT, tp->t_ifree_delta);
552 }
553
554 if (tp->t_fdblocks_delta != 0) {
555 INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_fdblocks_delta);
556 }
557 if (tp->t_res_fdblocks_delta != 0) {
558 INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_res_fdblocks_delta);
559 }
560
561 if (tp->t_frextents_delta != 0) {
562 INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_frextents_delta);
563 }
564 if (tp->t_res_frextents_delta != 0) {
565 INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_res_frextents_delta);
566 }
567 if (tp->t_dblocks_delta != 0) {
568 INT_MOD(sbp->sb_dblocks, ARCH_CONVERT, tp->t_dblocks_delta);
569 whole = 1;
570 }
571 if (tp->t_agcount_delta != 0) {
572 INT_MOD(sbp->sb_agcount, ARCH_CONVERT, tp->t_agcount_delta);
573 whole = 1;
574 }
575 if (tp->t_imaxpct_delta != 0) {
576 INT_MOD(sbp->sb_imax_pct, ARCH_CONVERT, tp->t_imaxpct_delta);
577 whole = 1;
578 }
579 if (tp->t_rextsize_delta != 0) {
580 INT_MOD(sbp->sb_rextsize, ARCH_CONVERT, tp->t_rextsize_delta);
581 whole = 1;
582 }
583 if (tp->t_rbmblocks_delta != 0) {
584 INT_MOD(sbp->sb_rbmblocks, ARCH_CONVERT, tp->t_rbmblocks_delta);
585 whole = 1;
586 }
587 if (tp->t_rblocks_delta != 0) {
588 INT_MOD(sbp->sb_rblocks, ARCH_CONVERT, tp->t_rblocks_delta);
589 whole = 1;
590 }
591 if (tp->t_rextents_delta != 0) {
592 INT_MOD(sbp->sb_rextents, ARCH_CONVERT, tp->t_rextents_delta);
593 whole = 1;
594 }
595 if (tp->t_rextslog_delta != 0) {
596 INT_MOD(sbp->sb_rextslog, ARCH_CONVERT, tp->t_rextslog_delta);
597 whole = 1;
598 }
599
600 if (whole)
601 /*
Nathan Scottc41564b2006-03-29 08:55:14 +1000602 * Log the whole thing, the fields are noncontiguous.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 */
604 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_sb_t) - 1);
605 else
606 /*
607 * Since all the modifiable fields are contiguous, we
608 * can get away with this.
609 */
610 xfs_trans_log_buf(tp, bp, offsetof(xfs_sb_t, sb_icount),
611 offsetof(xfs_sb_t, sb_frextents) +
612 sizeof(sbp->sb_frextents) - 1);
613
614 XFS_MTOVFS(tp->t_mountp)->vfs_super->s_dirt = 1;
615}
616
617/*
618 * xfs_trans_unreserve_and_mod_sb() is called to release unused
619 * reservations and apply superblock counter changes to the in-core
620 * superblock.
621 *
622 * This is done efficiently with a single call to xfs_mod_incore_sb_batch().
623 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000624STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625xfs_trans_unreserve_and_mod_sb(
626 xfs_trans_t *tp)
627{
628 xfs_mod_sb_t msb[14]; /* If you add cases, add entries */
629 xfs_mod_sb_t *msbp;
630 /* REFERENCED */
631 int error;
632 int rsvd;
633
634 msbp = msb;
635 rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
636
637 /*
638 * Release any reserved blocks. Any that were allocated
639 * will be taken back again by fdblocks_delta below.
640 */
641 if (tp->t_blk_res > 0) {
642 msbp->msb_field = XFS_SBS_FDBLOCKS;
643 msbp->msb_delta = tp->t_blk_res;
644 msbp++;
645 }
646
647 /*
648 * Release any reserved real time extents . Any that were
649 * allocated will be taken back again by frextents_delta below.
650 */
651 if (tp->t_rtx_res > 0) {
652 msbp->msb_field = XFS_SBS_FREXTENTS;
653 msbp->msb_delta = tp->t_rtx_res;
654 msbp++;
655 }
656
657 /*
658 * Apply any superblock modifications to the in-core version.
659 * The t_res_fdblocks_delta and t_res_frextents_delta fields are
Nathan Scottc41564b2006-03-29 08:55:14 +1000660 * explicitly NOT applied to the in-core superblock.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 * The idea is that that has already been done.
662 */
663 if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
664 if (tp->t_icount_delta != 0) {
665 msbp->msb_field = XFS_SBS_ICOUNT;
David Chinner20f4ebf2007-02-10 18:36:10 +1100666 msbp->msb_delta = tp->t_icount_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 msbp++;
668 }
669 if (tp->t_ifree_delta != 0) {
670 msbp->msb_field = XFS_SBS_IFREE;
David Chinner20f4ebf2007-02-10 18:36:10 +1100671 msbp->msb_delta = tp->t_ifree_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 msbp++;
673 }
674 if (tp->t_fdblocks_delta != 0) {
675 msbp->msb_field = XFS_SBS_FDBLOCKS;
David Chinner20f4ebf2007-02-10 18:36:10 +1100676 msbp->msb_delta = tp->t_fdblocks_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 msbp++;
678 }
679 if (tp->t_frextents_delta != 0) {
680 msbp->msb_field = XFS_SBS_FREXTENTS;
David Chinner20f4ebf2007-02-10 18:36:10 +1100681 msbp->msb_delta = tp->t_frextents_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 msbp++;
683 }
684 if (tp->t_dblocks_delta != 0) {
685 msbp->msb_field = XFS_SBS_DBLOCKS;
David Chinner20f4ebf2007-02-10 18:36:10 +1100686 msbp->msb_delta = tp->t_dblocks_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 msbp++;
688 }
689 if (tp->t_agcount_delta != 0) {
690 msbp->msb_field = XFS_SBS_AGCOUNT;
David Chinner20f4ebf2007-02-10 18:36:10 +1100691 msbp->msb_delta = tp->t_agcount_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 msbp++;
693 }
694 if (tp->t_imaxpct_delta != 0) {
695 msbp->msb_field = XFS_SBS_IMAX_PCT;
David Chinner20f4ebf2007-02-10 18:36:10 +1100696 msbp->msb_delta = tp->t_imaxpct_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 msbp++;
698 }
699 if (tp->t_rextsize_delta != 0) {
700 msbp->msb_field = XFS_SBS_REXTSIZE;
David Chinner20f4ebf2007-02-10 18:36:10 +1100701 msbp->msb_delta = tp->t_rextsize_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 msbp++;
703 }
704 if (tp->t_rbmblocks_delta != 0) {
705 msbp->msb_field = XFS_SBS_RBMBLOCKS;
David Chinner20f4ebf2007-02-10 18:36:10 +1100706 msbp->msb_delta = tp->t_rbmblocks_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 msbp++;
708 }
709 if (tp->t_rblocks_delta != 0) {
710 msbp->msb_field = XFS_SBS_RBLOCKS;
David Chinner20f4ebf2007-02-10 18:36:10 +1100711 msbp->msb_delta = tp->t_rblocks_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 msbp++;
713 }
714 if (tp->t_rextents_delta != 0) {
715 msbp->msb_field = XFS_SBS_REXTENTS;
David Chinner20f4ebf2007-02-10 18:36:10 +1100716 msbp->msb_delta = tp->t_rextents_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 msbp++;
718 }
719 if (tp->t_rextslog_delta != 0) {
720 msbp->msb_field = XFS_SBS_REXTSLOG;
David Chinner20f4ebf2007-02-10 18:36:10 +1100721 msbp->msb_delta = tp->t_rextslog_delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 msbp++;
723 }
724 }
725
726 /*
727 * If we need to change anything, do it.
728 */
729 if (msbp > msb) {
730 error = xfs_mod_incore_sb_batch(tp->t_mountp, msb,
731 (uint)(msbp - msb), rsvd);
732 ASSERT(error == 0);
733 }
734}
735
736
737/*
738 * xfs_trans_commit
739 *
740 * Commit the given transaction to the log a/synchronously.
741 *
742 * XFS disk error handling mechanism is not based on a typical
743 * transaction abort mechanism. Logically after the filesystem
744 * gets marked 'SHUTDOWN', we can't let any new transactions
745 * be durable - ie. committed to disk - because some metadata might
746 * be inconsistent. In such cases, this returns an error, and the
747 * caller may assume that all locked objects joined to the transaction
748 * have already been unlocked as if the commit had succeeded.
749 * Do not reference the transaction structure after this call.
750 */
751 /*ARGSUSED*/
752int
Christoph Hellwigf538d4d2005-11-02 10:26:59 +1100753_xfs_trans_commit(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 xfs_trans_t *tp,
755 uint flags,
Christoph Hellwigf538d4d2005-11-02 10:26:59 +1100756 xfs_lsn_t *commit_lsn_p,
757 int *log_flushed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758{
759 xfs_log_iovec_t *log_vector;
760 int nvec;
761 xfs_mount_t *mp;
762 xfs_lsn_t commit_lsn;
763 /* REFERENCED */
764 int error;
765 int log_flags;
766 int sync;
767#define XFS_TRANS_LOGVEC_COUNT 16
768 xfs_log_iovec_t log_vector_fast[XFS_TRANS_LOGVEC_COUNT];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 void *commit_iclog;
770 int shutdown;
771
772 commit_lsn = -1;
773
774 /*
775 * Determine whether this commit is releasing a permanent
776 * log reservation or not.
777 */
778 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
779 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
780 log_flags = XFS_LOG_REL_PERM_RESERV;
781 } else {
782 log_flags = 0;
783 }
784 mp = tp->t_mountp;
785
786 /*
787 * If there is nothing to be logged by the transaction,
788 * then unlock all of the items associated with the
789 * transaction and free the transaction structure.
790 * Also make sure to return any reserved blocks to
791 * the free pool.
792 */
793shut_us_down:
794 shutdown = XFS_FORCED_SHUTDOWN(mp) ? EIO : 0;
795 if (!(tp->t_flags & XFS_TRANS_DIRTY) || shutdown) {
796 xfs_trans_unreserve_and_mod_sb(tp);
797 /*
798 * It is indeed possible for the transaction to be
799 * not dirty but the dqinfo portion to be. All that
800 * means is that we have some (non-persistent) quota
801 * reservations that need to be unreserved.
802 */
803 XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp);
804 if (tp->t_ticket) {
805 commit_lsn = xfs_log_done(mp, tp->t_ticket,
806 NULL, log_flags);
807 if (commit_lsn == -1 && !shutdown)
808 shutdown = XFS_ERROR(EIO);
809 }
Nathan Scott59c1b082006-06-09 14:59:13 +1000810 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 xfs_trans_free_items(tp, shutdown? XFS_TRANS_ABORT : 0);
812 xfs_trans_free_busy(tp);
813 xfs_trans_free(tp);
814 XFS_STATS_INC(xs_trans_empty);
815 if (commit_lsn_p)
816 *commit_lsn_p = commit_lsn;
817 return (shutdown);
818 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 ASSERT(tp->t_ticket != NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
821 /*
822 * If we need to update the superblock, then do it now.
823 */
824 if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
825 xfs_trans_apply_sb_deltas(tp);
826 }
827 XFS_TRANS_APPLY_DQUOT_DELTAS(mp, tp);
828
829 /*
830 * Ask each log item how many log_vector entries it will
831 * need so we can figure out how many to allocate.
832 * Try to avoid the kmem_alloc() call in the common case
833 * by using a vector from the stack when it fits.
834 */
835 nvec = xfs_trans_count_vecs(tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 if (nvec == 0) {
Nathan Scott7d04a332006-06-09 14:58:38 +1000837 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 goto shut_us_down;
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100839 } else if (nvec <= XFS_TRANS_LOGVEC_COUNT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 log_vector = log_vector_fast;
841 } else {
842 log_vector = (xfs_log_iovec_t *)kmem_alloc(nvec *
843 sizeof(xfs_log_iovec_t),
844 KM_SLEEP);
845 }
846
847 /*
848 * Fill in the log_vector and pin the logged items, and
849 * then write the transaction to the log.
850 */
851 xfs_trans_fill_vecs(tp, log_vector);
852
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100853 error = xfs_log_write(mp, log_vector, nvec, tp->t_ticket, &(tp->t_lsn));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 /*
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100856 * The transaction is committed incore here, and can go out to disk
857 * at any time after this call. However, all the items associated
858 * with the transaction are still locked and pinned in memory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 */
860 commit_lsn = xfs_log_done(mp, tp->t_ticket, &commit_iclog, log_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
862 tp->t_commit_lsn = commit_lsn;
863 if (nvec > XFS_TRANS_LOGVEC_COUNT) {
864 kmem_free(log_vector, nvec * sizeof(xfs_log_iovec_t));
865 }
866
867 if (commit_lsn_p)
868 *commit_lsn_p = commit_lsn;
869
870 /*
871 * If we got a log write error. Unpin the logitems that we
872 * had pinned, clean up, free trans structure, and return error.
873 */
874 if (error || commit_lsn == -1) {
Nathan Scott59c1b082006-06-09 14:59:13 +1000875 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 xfs_trans_uncommit(tp, flags|XFS_TRANS_ABORT);
877 return XFS_ERROR(EIO);
878 }
879
880 /*
881 * Once the transaction has committed, unused
882 * reservations need to be released and changes to
883 * the superblock need to be reflected in the in-core
884 * version. Do that now.
885 */
886 xfs_trans_unreserve_and_mod_sb(tp);
887
888 sync = tp->t_flags & XFS_TRANS_SYNC;
889
890 /*
891 * Tell the LM to call the transaction completion routine
892 * when the log write with LSN commit_lsn completes (e.g.
893 * when the transaction commit really hits the on-disk log).
894 * After this call we cannot reference tp, because the call
895 * can happen at any time and the call will free the transaction
896 * structure pointed to by tp. The only case where we call
897 * the completion routine (xfs_trans_committed) directly is
898 * if the log is turned off on a debug kernel or we're
899 * running in simulation mode (the log is explicitly turned
900 * off).
901 */
902 tp->t_logcb.cb_func = (void(*)(void*, int))xfs_trans_committed;
903 tp->t_logcb.cb_arg = tp;
904
905 /*
906 * We need to pass the iclog buffer which was used for the
907 * transaction commit record into this function, and attach
908 * the callback to it. The callback must be attached before
909 * the items are unlocked to avoid racing with other threads
910 * waiting for an item to unlock.
911 */
912 shutdown = xfs_log_notify(mp, commit_iclog, &(tp->t_logcb));
913
914 /*
915 * Mark this thread as no longer being in a transaction
916 */
Nathan Scott59c1b082006-06-09 14:59:13 +1000917 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
919 /*
920 * Once all the items of the transaction have been copied
921 * to the in core log and the callback is attached, the
922 * items can be unlocked.
923 *
924 * This will free descriptors pointing to items which were
925 * not logged since there is nothing more to do with them.
926 * For items which were logged, we will keep pointers to them
927 * so they can be unpinned after the transaction commits to disk.
928 * This will also stamp each modified meta-data item with
929 * the commit lsn of this transaction for dependency tracking
930 * purposes.
931 */
932 xfs_trans_unlock_items(tp, commit_lsn);
933
934 /*
935 * If we detected a log error earlier, finish committing
936 * the transaction now (unpin log items, etc).
937 *
938 * Order is critical here, to avoid using the transaction
939 * pointer after its been freed (by xfs_trans_committed
940 * either here now, or as a callback). We cannot do this
941 * step inside xfs_log_notify as was done earlier because
942 * of this issue.
943 */
944 if (shutdown)
945 xfs_trans_committed(tp, XFS_LI_ABORTED);
946
947 /*
948 * Now that the xfs_trans_committed callback has been attached,
949 * and the items are released we can finally allow the iclog to
950 * go to disk.
951 */
952 error = xfs_log_release_iclog(mp, commit_iclog);
953
954 /*
955 * If the transaction needs to be synchronous, then force the
956 * log out now and wait for it.
957 */
958 if (sync) {
Christoph Hellwigf538d4d2005-11-02 10:26:59 +1100959 if (!error) {
960 error = _xfs_log_force(mp, commit_lsn,
961 XFS_LOG_FORCE | XFS_LOG_SYNC,
962 log_flushed);
963 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 XFS_STATS_INC(xs_trans_sync);
965 } else {
966 XFS_STATS_INC(xs_trans_async);
967 }
968
969 return (error);
970}
971
972
973/*
974 * Total up the number of log iovecs needed to commit this
975 * transaction. The transaction itself needs one for the
976 * transaction header. Ask each dirty item in turn how many
977 * it needs to get the total.
978 */
979STATIC uint
980xfs_trans_count_vecs(
981 xfs_trans_t *tp)
982{
983 int nvecs;
984 xfs_log_item_desc_t *lidp;
985
986 nvecs = 1;
987 lidp = xfs_trans_first_item(tp);
988 ASSERT(lidp != NULL);
989
990 /* In the non-debug case we need to start bailing out if we
991 * didn't find a log_item here, return zero and let trans_commit
992 * deal with it.
993 */
994 if (lidp == NULL)
995 return 0;
996
997 while (lidp != NULL) {
998 /*
999 * Skip items which aren't dirty in this transaction.
1000 */
1001 if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
1002 lidp = xfs_trans_next_item(tp, lidp);
1003 continue;
1004 }
1005 lidp->lid_size = IOP_SIZE(lidp->lid_item);
1006 nvecs += lidp->lid_size;
1007 lidp = xfs_trans_next_item(tp, lidp);
1008 }
1009
1010 return nvecs;
1011}
1012
1013/*
1014 * Called from the trans_commit code when we notice that
1015 * the filesystem is in the middle of a forced shutdown.
1016 */
1017STATIC void
1018xfs_trans_uncommit(
1019 xfs_trans_t *tp,
1020 uint flags)
1021{
1022 xfs_log_item_desc_t *lidp;
1023
1024 for (lidp = xfs_trans_first_item(tp);
1025 lidp != NULL;
1026 lidp = xfs_trans_next_item(tp, lidp)) {
1027 /*
1028 * Unpin all but those that aren't dirty.
1029 */
1030 if (lidp->lid_flags & XFS_LID_DIRTY)
1031 IOP_UNPIN_REMOVE(lidp->lid_item, tp);
1032 }
1033
1034 xfs_trans_unreserve_and_mod_sb(tp);
1035 XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(tp->t_mountp, tp);
1036
1037 xfs_trans_free_items(tp, flags);
1038 xfs_trans_free_busy(tp);
1039 xfs_trans_free(tp);
1040}
1041
1042/*
1043 * Fill in the vector with pointers to data to be logged
1044 * by this transaction. The transaction header takes
1045 * the first vector, and then each dirty item takes the
1046 * number of vectors it indicated it needed in xfs_trans_count_vecs().
1047 *
1048 * As each item fills in the entries it needs, also pin the item
1049 * so that it cannot be flushed out until the log write completes.
1050 */
1051STATIC void
1052xfs_trans_fill_vecs(
1053 xfs_trans_t *tp,
1054 xfs_log_iovec_t *log_vector)
1055{
1056 xfs_log_item_desc_t *lidp;
1057 xfs_log_iovec_t *vecp;
1058 uint nitems;
1059
1060 /*
1061 * Skip over the entry for the transaction header, we'll
1062 * fill that in at the end.
1063 */
1064 vecp = log_vector + 1; /* pointer arithmetic */
1065
1066 nitems = 0;
1067 lidp = xfs_trans_first_item(tp);
1068 ASSERT(lidp != NULL);
1069 while (lidp != NULL) {
1070 /*
1071 * Skip items which aren't dirty in this transaction.
1072 */
1073 if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
1074 lidp = xfs_trans_next_item(tp, lidp);
1075 continue;
1076 }
1077 /*
1078 * The item may be marked dirty but not log anything.
1079 * This can be used to get called when a transaction
1080 * is committed.
1081 */
1082 if (lidp->lid_size) {
1083 nitems++;
1084 }
1085 IOP_FORMAT(lidp->lid_item, vecp);
1086 vecp += lidp->lid_size; /* pointer arithmetic */
1087 IOP_PIN(lidp->lid_item);
1088 lidp = xfs_trans_next_item(tp, lidp);
1089 }
1090
1091 /*
1092 * Now that we've counted the number of items in this
1093 * transaction, fill in the transaction header.
1094 */
1095 tp->t_header.th_magic = XFS_TRANS_HEADER_MAGIC;
1096 tp->t_header.th_type = tp->t_type;
1097 tp->t_header.th_num_items = nitems;
1098 log_vector->i_addr = (xfs_caddr_t)&tp->t_header;
1099 log_vector->i_len = sizeof(xfs_trans_header_t);
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001100 XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_TRANSHDR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101}
1102
1103
1104/*
1105 * Unlock all of the transaction's items and free the transaction.
1106 * The transaction must not have modified any of its items, because
1107 * there is no way to restore them to their previous state.
1108 *
1109 * If the transaction has made a log reservation, make sure to release
1110 * it as well.
1111 */
1112void
1113xfs_trans_cancel(
1114 xfs_trans_t *tp,
1115 int flags)
1116{
1117 int log_flags;
1118#ifdef DEBUG
1119 xfs_log_item_chunk_t *licp;
1120 xfs_log_item_desc_t *lidp;
1121 xfs_log_item_t *lip;
1122 int i;
1123#endif
Ryan Hankins0733af22006-01-11 15:36:44 +11001124 xfs_mount_t *mp = tp->t_mountp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125
1126 /*
1127 * See if the caller is being too lazy to figure out if
1128 * the transaction really needs an abort.
1129 */
1130 if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY))
1131 flags &= ~XFS_TRANS_ABORT;
1132 /*
1133 * See if the caller is relying on us to shut down the
1134 * filesystem. This happens in paths where we detect
1135 * corruption and decide to give up.
1136 */
Nathan Scott60a204f2006-01-11 15:37:00 +11001137 if ((tp->t_flags & XFS_TRANS_DIRTY) && !XFS_FORCED_SHUTDOWN(mp)) {
Ryan Hankins0733af22006-01-11 15:36:44 +11001138 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
Nathan Scott7d04a332006-06-09 14:58:38 +10001139 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
Nathan Scott60a204f2006-01-11 15:37:00 +11001140 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141#ifdef DEBUG
1142 if (!(flags & XFS_TRANS_ABORT)) {
1143 licp = &(tp->t_items);
1144 while (licp != NULL) {
1145 lidp = licp->lic_descs;
1146 for (i = 0; i < licp->lic_unused; i++, lidp++) {
1147 if (XFS_LIC_ISFREE(licp, i)) {
1148 continue;
1149 }
1150
1151 lip = lidp->lid_item;
Ryan Hankins0733af22006-01-11 15:36:44 +11001152 if (!XFS_FORCED_SHUTDOWN(mp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 ASSERT(!(lip->li_type == XFS_LI_EFD));
1154 }
1155 licp = licp->lic_next;
1156 }
1157 }
1158#endif
1159 xfs_trans_unreserve_and_mod_sb(tp);
Ryan Hankins0733af22006-01-11 15:36:44 +11001160 XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161
1162 if (tp->t_ticket) {
1163 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
1164 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
1165 log_flags = XFS_LOG_REL_PERM_RESERV;
1166 } else {
1167 log_flags = 0;
1168 }
Ryan Hankins0733af22006-01-11 15:36:44 +11001169 xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 }
1171
1172 /* mark this thread as no longer being in a transaction */
Nathan Scott59c1b082006-06-09 14:59:13 +10001173 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174
1175 xfs_trans_free_items(tp, flags);
1176 xfs_trans_free_busy(tp);
1177 xfs_trans_free(tp);
1178}
1179
1180
1181/*
1182 * Free the transaction structure. If there is more clean up
1183 * to do when the structure is freed, add it here.
1184 */
1185STATIC void
1186xfs_trans_free(
1187 xfs_trans_t *tp)
1188{
1189 atomic_dec(&tp->t_mountp->m_active_trans);
1190 XFS_TRANS_FREE_DQINFO(tp->t_mountp, tp);
1191 kmem_zone_free(xfs_trans_zone, tp);
1192}
1193
1194
1195/*
1196 * THIS SHOULD BE REWRITTEN TO USE xfs_trans_next_item().
1197 *
1198 * This is typically called by the LM when a transaction has been fully
1199 * committed to disk. It needs to unpin the items which have
1200 * been logged by the transaction and update their positions
1201 * in the AIL if necessary.
1202 * This also gets called when the transactions didn't get written out
1203 * because of an I/O error. Abortflag & XFS_LI_ABORTED is set then.
1204 *
1205 * Call xfs_trans_chunk_committed() to process the items in
1206 * each chunk.
1207 */
1208STATIC void
1209xfs_trans_committed(
1210 xfs_trans_t *tp,
1211 int abortflag)
1212{
1213 xfs_log_item_chunk_t *licp;
1214 xfs_log_item_chunk_t *next_licp;
1215 xfs_log_busy_chunk_t *lbcp;
1216 xfs_log_busy_slot_t *lbsp;
1217 int i;
1218
1219 /*
1220 * Call the transaction's completion callback if there
1221 * is one.
1222 */
1223 if (tp->t_callback != NULL) {
1224 tp->t_callback(tp, tp->t_callarg);
1225 }
1226
1227 /*
1228 * Special case the chunk embedded in the transaction.
1229 */
1230 licp = &(tp->t_items);
1231 if (!(XFS_LIC_ARE_ALL_FREE(licp))) {
1232 xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag);
1233 }
1234
1235 /*
1236 * Process the items in each chunk in turn.
1237 */
1238 licp = licp->lic_next;
1239 while (licp != NULL) {
1240 ASSERT(!XFS_LIC_ARE_ALL_FREE(licp));
1241 xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag);
1242 next_licp = licp->lic_next;
1243 kmem_free(licp, sizeof(xfs_log_item_chunk_t));
1244 licp = next_licp;
1245 }
1246
1247 /*
1248 * Clear all the per-AG busy list items listed in this transaction
1249 */
1250 lbcp = &tp->t_busy;
1251 while (lbcp != NULL) {
1252 for (i = 0, lbsp = lbcp->lbc_busy; i < lbcp->lbc_unused; i++, lbsp++) {
1253 if (!XFS_LBC_ISFREE(lbcp, i)) {
1254 xfs_alloc_clear_busy(tp, lbsp->lbc_ag,
1255 lbsp->lbc_idx);
1256 }
1257 }
1258 lbcp = lbcp->lbc_next;
1259 }
1260 xfs_trans_free_busy(tp);
1261
1262 /*
1263 * That's it for the transaction structure. Free it.
1264 */
1265 xfs_trans_free(tp);
1266}
1267
1268/*
1269 * This is called to perform the commit processing for each
1270 * item described by the given chunk.
1271 *
1272 * The commit processing consists of unlocking items which were
1273 * held locked with the SYNC_UNLOCK attribute, calling the committed
1274 * routine of each logged item, updating the item's position in the AIL
1275 * if necessary, and unpinning each item. If the committed routine
1276 * returns -1, then do nothing further with the item because it
1277 * may have been freed.
1278 *
1279 * Since items are unlocked when they are copied to the incore
1280 * log, it is possible for two transactions to be completing
1281 * and manipulating the same item simultaneously. The AIL lock
1282 * will protect the lsn field of each item. The value of this
1283 * field can never go backwards.
1284 *
1285 * We unpin the items after repositioning them in the AIL, because
1286 * otherwise they could be immediately flushed and we'd have to race
1287 * with the flusher trying to pull the item from the AIL as we add it.
1288 */
1289STATIC void
1290xfs_trans_chunk_committed(
1291 xfs_log_item_chunk_t *licp,
1292 xfs_lsn_t lsn,
1293 int aborted)
1294{
1295 xfs_log_item_desc_t *lidp;
1296 xfs_log_item_t *lip;
1297 xfs_lsn_t item_lsn;
1298 struct xfs_mount *mp;
1299 int i;
1300 SPLDECL(s);
1301
1302 lidp = licp->lic_descs;
1303 for (i = 0; i < licp->lic_unused; i++, lidp++) {
1304 if (XFS_LIC_ISFREE(licp, i)) {
1305 continue;
1306 }
1307
1308 lip = lidp->lid_item;
1309 if (aborted)
1310 lip->li_flags |= XFS_LI_ABORTED;
1311
1312 /*
1313 * Send in the ABORTED flag to the COMMITTED routine
1314 * so that it knows whether the transaction was aborted
1315 * or not.
1316 */
1317 item_lsn = IOP_COMMITTED(lip, lsn);
1318
1319 /*
1320 * If the committed routine returns -1, make
1321 * no more references to the item.
1322 */
1323 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0) {
1324 continue;
1325 }
1326
1327 /*
1328 * If the returned lsn is greater than what it
1329 * contained before, update the location of the
1330 * item in the AIL. If it is not, then do nothing.
1331 * Items can never move backwards in the AIL.
1332 *
1333 * While the new lsn should usually be greater, it
1334 * is possible that a later transaction completing
1335 * simultaneously with an earlier one using the
1336 * same item could complete first with a higher lsn.
1337 * This would cause the earlier transaction to fail
1338 * the test below.
1339 */
1340 mp = lip->li_mountp;
1341 AIL_LOCK(mp,s);
1342 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0) {
1343 /*
1344 * This will set the item's lsn to item_lsn
1345 * and update the position of the item in
1346 * the AIL.
1347 *
1348 * xfs_trans_update_ail() drops the AIL lock.
1349 */
1350 xfs_trans_update_ail(mp, lip, item_lsn, s);
1351 } else {
1352 AIL_UNLOCK(mp, s);
1353 }
1354
1355 /*
1356 * Now that we've repositioned the item in the AIL,
1357 * unpin it so it can be flushed. Pass information
1358 * about buffer stale state down from the log item
1359 * flags, if anyone else stales the buffer we do not
1360 * want to pay any attention to it.
1361 */
1362 IOP_UNPIN(lip, lidp->lid_flags & XFS_LID_BUF_STALE);
1363 }
1364}