xref: /openbmc/linux/fs/xfs/xfs_trans.c (revision c21b37f6)
1 /*
2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
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
7  * published by the Free Software Foundation.
8  *
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.
13  *
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
17  */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_error.h"
31 #include "xfs_da_btree.h"
32 #include "xfs_bmap_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_ialloc_btree.h"
35 #include "xfs_dir2_sf.h"
36 #include "xfs_attr_sf.h"
37 #include "xfs_dinode.h"
38 #include "xfs_inode.h"
39 #include "xfs_btree.h"
40 #include "xfs_ialloc.h"
41 #include "xfs_alloc.h"
42 #include "xfs_bmap.h"
43 #include "xfs_quota.h"
44 #include "xfs_trans_priv.h"
45 #include "xfs_trans_space.h"
46 
47 
48 STATIC void	xfs_trans_apply_sb_deltas(xfs_trans_t *);
49 STATIC uint	xfs_trans_count_vecs(xfs_trans_t *);
50 STATIC void	xfs_trans_fill_vecs(xfs_trans_t *, xfs_log_iovec_t *);
51 STATIC void	xfs_trans_uncommit(xfs_trans_t *, uint);
52 STATIC void	xfs_trans_committed(xfs_trans_t *, int);
53 STATIC void	xfs_trans_chunk_committed(xfs_log_item_chunk_t *, xfs_lsn_t, int);
54 STATIC void	xfs_trans_free(xfs_trans_t *);
55 
56 kmem_zone_t	*xfs_trans_zone;
57 
58 
59 /*
60  * Reservation functions here avoid a huge stack in xfs_trans_init
61  * due to register overflow from temporaries in the calculations.
62  */
63 
64 STATIC uint
65 xfs_calc_write_reservation(xfs_mount_t *mp)
66 {
67 	return XFS_CALC_WRITE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
68 }
69 
70 STATIC uint
71 xfs_calc_itruncate_reservation(xfs_mount_t *mp)
72 {
73 	return XFS_CALC_ITRUNCATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
74 }
75 
76 STATIC uint
77 xfs_calc_rename_reservation(xfs_mount_t *mp)
78 {
79 	return XFS_CALC_RENAME_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
80 }
81 
82 STATIC uint
83 xfs_calc_link_reservation(xfs_mount_t *mp)
84 {
85 	return XFS_CALC_LINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
86 }
87 
88 STATIC uint
89 xfs_calc_remove_reservation(xfs_mount_t *mp)
90 {
91 	return XFS_CALC_REMOVE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
92 }
93 
94 STATIC uint
95 xfs_calc_symlink_reservation(xfs_mount_t *mp)
96 {
97 	return XFS_CALC_SYMLINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
98 }
99 
100 STATIC uint
101 xfs_calc_create_reservation(xfs_mount_t *mp)
102 {
103 	return XFS_CALC_CREATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
104 }
105 
106 STATIC uint
107 xfs_calc_mkdir_reservation(xfs_mount_t *mp)
108 {
109 	return XFS_CALC_MKDIR_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
110 }
111 
112 STATIC uint
113 xfs_calc_ifree_reservation(xfs_mount_t *mp)
114 {
115 	return XFS_CALC_IFREE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
116 }
117 
118 STATIC uint
119 xfs_calc_ichange_reservation(xfs_mount_t *mp)
120 {
121 	return XFS_CALC_ICHANGE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
122 }
123 
124 STATIC uint
125 xfs_calc_growdata_reservation(xfs_mount_t *mp)
126 {
127 	return XFS_CALC_GROWDATA_LOG_RES(mp);
128 }
129 
130 STATIC uint
131 xfs_calc_growrtalloc_reservation(xfs_mount_t *mp)
132 {
133 	return XFS_CALC_GROWRTALLOC_LOG_RES(mp);
134 }
135 
136 STATIC uint
137 xfs_calc_growrtzero_reservation(xfs_mount_t *mp)
138 {
139 	return XFS_CALC_GROWRTZERO_LOG_RES(mp);
140 }
141 
142 STATIC uint
143 xfs_calc_growrtfree_reservation(xfs_mount_t *mp)
144 {
145 	return XFS_CALC_GROWRTFREE_LOG_RES(mp);
146 }
147 
148 STATIC uint
149 xfs_calc_swrite_reservation(xfs_mount_t *mp)
150 {
151 	return XFS_CALC_SWRITE_LOG_RES(mp);
152 }
153 
154 STATIC uint
155 xfs_calc_writeid_reservation(xfs_mount_t *mp)
156 {
157 	return XFS_CALC_WRITEID_LOG_RES(mp);
158 }
159 
160 STATIC uint
161 xfs_calc_addafork_reservation(xfs_mount_t *mp)
162 {
163 	return XFS_CALC_ADDAFORK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
164 }
165 
166 STATIC uint
167 xfs_calc_attrinval_reservation(xfs_mount_t *mp)
168 {
169 	return XFS_CALC_ATTRINVAL_LOG_RES(mp);
170 }
171 
172 STATIC uint
173 xfs_calc_attrset_reservation(xfs_mount_t *mp)
174 {
175 	return XFS_CALC_ATTRSET_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
176 }
177 
178 STATIC uint
179 xfs_calc_attrrm_reservation(xfs_mount_t *mp)
180 {
181 	return XFS_CALC_ATTRRM_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
182 }
183 
184 STATIC uint
185 xfs_calc_clear_agi_bucket_reservation(xfs_mount_t *mp)
186 {
187 	return XFS_CALC_CLEAR_AGI_BUCKET_LOG_RES(mp);
188 }
189 
190 /*
191  * Initialize the precomputed transaction reservation values
192  * in the mount structure.
193  */
194 void
195 xfs_trans_init(
196 	xfs_mount_t	*mp)
197 {
198 	xfs_trans_reservations_t	*resp;
199 
200 	resp = &(mp->m_reservations);
201 	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);
222 }
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  */
232 xfs_trans_t *
233 xfs_trans_alloc(
234 	xfs_mount_t	*mp,
235 	uint		type)
236 {
237 	vfs_wait_for_freeze(XFS_MTOVFS(mp), SB_FREEZE_TRANS);
238 	return _xfs_trans_alloc(mp, type);
239 }
240 
241 xfs_trans_t *
242 _xfs_trans_alloc(
243 	xfs_mount_t	*mp,
244 	uint		type)
245 {
246 	xfs_trans_t	*tp;
247 
248 	atomic_inc(&mp->m_active_trans);
249 
250 	tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
251 	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));
258 	return tp;
259 }
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  */
269 xfs_trans_t *
270 xfs_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);
289 	ASSERT(tp->t_ticket != NULL);
290 
291 	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;
297 	ntp->t_pflags = tp->t_pflags;
298 
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  */
319 int
320 xfs_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;
329 	int		error = 0;
330 	int		rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
331 
332 	/* Mark this thread as being in a transaction */
333 	current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
334 
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,
342 					  -((int64_t)blocks), rsvd);
343 		if (error != 0) {
344 			current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
345 			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,
368 					XFS_TRANSACTION, log_flags, tp->t_type);
369 		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,
383 					  -((int64_t)rtextents), rsvd);
384 		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 	 */
397 undo_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 
410 undo_blocks:
411 	if (blocks > 0) {
412 		(void) xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS,
413 					 (int64_t)blocks, rsvd);
414 		tp->t_blk_res = 0;
415 	}
416 
417 	current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
418 
419 	return error;
420 }
421 
422 
423 /*
424  * 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  *
431  * Because we may not be keeping track of allocated/free inodes and
432  * used filesystem blocks in the superblock, we do not mark the
433  * superblock dirty in this transaction if we modify these fields.
434  * We still need to update the transaction deltas so that they get
435  * applied to the incore superblock, but we don't want them to
436  * cause the superblock to get locked and logged if these are the
437  * only fields in the superblock that the transaction modifies.
438  */
439 void
440 xfs_trans_mod_sb(
441 	xfs_trans_t	*tp,
442 	uint		field,
443 	int64_t		delta)
444 {
445 	uint32_t	flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
446 	xfs_mount_t	*mp = tp->t_mountp;
447 
448 	switch (field) {
449 	case XFS_TRANS_SB_ICOUNT:
450 		tp->t_icount_delta += delta;
451 		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
452 			flags &= ~XFS_TRANS_SB_DIRTY;
453 		break;
454 	case XFS_TRANS_SB_IFREE:
455 		tp->t_ifree_delta += delta;
456 		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
457 			flags &= ~XFS_TRANS_SB_DIRTY;
458 		break;
459 	case XFS_TRANS_SB_FDBLOCKS:
460 		/*
461 		 * Track the number of blocks allocated in the
462 		 * transaction.  Make sure it does not exceed the
463 		 * number reserved.
464 		 */
465 		if (delta < 0) {
466 			tp->t_blk_res_used += (uint)-delta;
467 			ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
468 		}
469 		tp->t_fdblocks_delta += delta;
470 		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
471 			flags &= ~XFS_TRANS_SB_DIRTY;
472 		break;
473 	case XFS_TRANS_SB_RES_FDBLOCKS:
474 		/*
475 		 * The allocation has already been applied to the
476 		 * in-core superblock's counter.  This should only
477 		 * be applied to the on-disk superblock.
478 		 */
479 		ASSERT(delta < 0);
480 		tp->t_res_fdblocks_delta += delta;
481 		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
482 			flags &= ~XFS_TRANS_SB_DIRTY;
483 		break;
484 	case XFS_TRANS_SB_FREXTENTS:
485 		/*
486 		 * Track the number of blocks allocated in the
487 		 * transaction.  Make sure it does not exceed the
488 		 * number reserved.
489 		 */
490 		if (delta < 0) {
491 			tp->t_rtx_res_used += (uint)-delta;
492 			ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
493 		}
494 		tp->t_frextents_delta += delta;
495 		break;
496 	case XFS_TRANS_SB_RES_FREXTENTS:
497 		/*
498 		 * The allocation has already been applied to the
499 		 * in-core superblock's counter.  This should only
500 		 * be applied to the on-disk superblock.
501 		 */
502 		ASSERT(delta < 0);
503 		tp->t_res_frextents_delta += delta;
504 		break;
505 	case XFS_TRANS_SB_DBLOCKS:
506 		ASSERT(delta > 0);
507 		tp->t_dblocks_delta += delta;
508 		break;
509 	case XFS_TRANS_SB_AGCOUNT:
510 		ASSERT(delta > 0);
511 		tp->t_agcount_delta += delta;
512 		break;
513 	case XFS_TRANS_SB_IMAXPCT:
514 		tp->t_imaxpct_delta += delta;
515 		break;
516 	case XFS_TRANS_SB_REXTSIZE:
517 		tp->t_rextsize_delta += delta;
518 		break;
519 	case XFS_TRANS_SB_RBMBLOCKS:
520 		tp->t_rbmblocks_delta += delta;
521 		break;
522 	case XFS_TRANS_SB_RBLOCKS:
523 		tp->t_rblocks_delta += delta;
524 		break;
525 	case XFS_TRANS_SB_REXTENTS:
526 		tp->t_rextents_delta += delta;
527 		break;
528 	case XFS_TRANS_SB_REXTSLOG:
529 		tp->t_rextslog_delta += delta;
530 		break;
531 	default:
532 		ASSERT(0);
533 		return;
534 	}
535 
536 	tp->t_flags |= flags;
537 }
538 
539 /*
540  * xfs_trans_apply_sb_deltas() is called from the commit code
541  * to bring the superblock buffer into the current transaction
542  * and modify it as requested by earlier calls to xfs_trans_mod_sb().
543  *
544  * For now we just look at each field allowed to change and change
545  * it if necessary.
546  */
547 STATIC void
548 xfs_trans_apply_sb_deltas(
549 	xfs_trans_t	*tp)
550 {
551 	xfs_sb_t	*sbp;
552 	xfs_buf_t	*bp;
553 	int		whole = 0;
554 
555 	bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
556 	sbp = XFS_BUF_TO_SBP(bp);
557 
558 	/*
559 	 * Check that superblock mods match the mods made to AGF counters.
560 	 */
561 	ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
562 	       (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
563 		tp->t_ag_btree_delta));
564 
565 	/*
566 	 * Only update the superblock counters if we are logging them
567 	 */
568 	if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
569 		if (tp->t_icount_delta != 0) {
570 			INT_MOD(sbp->sb_icount, ARCH_CONVERT, tp->t_icount_delta);
571 		}
572 		if (tp->t_ifree_delta != 0) {
573 			INT_MOD(sbp->sb_ifree, ARCH_CONVERT, tp->t_ifree_delta);
574 		}
575 
576 		if (tp->t_fdblocks_delta != 0) {
577 			INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_fdblocks_delta);
578 		}
579 		if (tp->t_res_fdblocks_delta != 0) {
580 			INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_res_fdblocks_delta);
581 		}
582 	}
583 
584 	if (tp->t_frextents_delta != 0) {
585 		INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_frextents_delta);
586 	}
587 	if (tp->t_res_frextents_delta != 0) {
588 		INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_res_frextents_delta);
589 	}
590 	if (tp->t_dblocks_delta != 0) {
591 		INT_MOD(sbp->sb_dblocks, ARCH_CONVERT, tp->t_dblocks_delta);
592 		whole = 1;
593 	}
594 	if (tp->t_agcount_delta != 0) {
595 		INT_MOD(sbp->sb_agcount, ARCH_CONVERT, tp->t_agcount_delta);
596 		whole = 1;
597 	}
598 	if (tp->t_imaxpct_delta != 0) {
599 		INT_MOD(sbp->sb_imax_pct, ARCH_CONVERT, tp->t_imaxpct_delta);
600 		whole = 1;
601 	}
602 	if (tp->t_rextsize_delta != 0) {
603 		INT_MOD(sbp->sb_rextsize, ARCH_CONVERT, tp->t_rextsize_delta);
604 		whole = 1;
605 	}
606 	if (tp->t_rbmblocks_delta != 0) {
607 		INT_MOD(sbp->sb_rbmblocks, ARCH_CONVERT, tp->t_rbmblocks_delta);
608 		whole = 1;
609 	}
610 	if (tp->t_rblocks_delta != 0) {
611 		INT_MOD(sbp->sb_rblocks, ARCH_CONVERT, tp->t_rblocks_delta);
612 		whole = 1;
613 	}
614 	if (tp->t_rextents_delta != 0) {
615 		INT_MOD(sbp->sb_rextents, ARCH_CONVERT, tp->t_rextents_delta);
616 		whole = 1;
617 	}
618 	if (tp->t_rextslog_delta != 0) {
619 		INT_MOD(sbp->sb_rextslog, ARCH_CONVERT, tp->t_rextslog_delta);
620 		whole = 1;
621 	}
622 
623 	if (whole)
624 		/*
625 		 * Log the whole thing, the fields are noncontiguous.
626 		 */
627 		xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_sb_t) - 1);
628 	else
629 		/*
630 		 * Since all the modifiable fields are contiguous, we
631 		 * can get away with this.
632 		 */
633 		xfs_trans_log_buf(tp, bp, offsetof(xfs_sb_t, sb_icount),
634 				  offsetof(xfs_sb_t, sb_frextents) +
635 				  sizeof(sbp->sb_frextents) - 1);
636 
637 	XFS_MTOVFS(tp->t_mountp)->vfs_super->s_dirt = 1;
638 }
639 
640 /*
641  * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
642  * and apply superblock counter changes to the in-core superblock.  The
643  * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
644  * applied to the in-core superblock.  The idea is that that has already been
645  * done.
646  *
647  * This is done efficiently with a single call to xfs_mod_incore_sb_batch().
648  * However, we have to ensure that we only modify each superblock field only
649  * once because the application of the delta values may not be atomic. That can
650  * lead to ENOSPC races occurring if we have two separate modifcations of the
651  * free space counter to put back the entire reservation and then take away
652  * what we used.
653  *
654  * If we are not logging superblock counters, then the inode allocated/free and
655  * used block counts are not updated in the on disk superblock. In this case,
656  * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
657  * still need to update the incore superblock with the changes.
658  */
659 STATIC void
660 xfs_trans_unreserve_and_mod_sb(
661 	xfs_trans_t	*tp)
662 {
663 	xfs_mod_sb_t	msb[14];	/* If you add cases, add entries */
664 	xfs_mod_sb_t	*msbp;
665 	xfs_mount_t	*mp = tp->t_mountp;
666 	/* REFERENCED */
667 	int		error;
668 	int		rsvd;
669 	int64_t		blkdelta = 0;
670 	int64_t		rtxdelta = 0;
671 
672 	msbp = msb;
673 	rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
674 
675 	/* calculate free blocks delta */
676 	if (tp->t_blk_res > 0)
677 		blkdelta = tp->t_blk_res;
678 
679 	if ((tp->t_fdblocks_delta != 0) &&
680 	    (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
681 	     (tp->t_flags & XFS_TRANS_SB_DIRTY)))
682 	        blkdelta += tp->t_fdblocks_delta;
683 
684 	if (blkdelta != 0) {
685 		msbp->msb_field = XFS_SBS_FDBLOCKS;
686 		msbp->msb_delta = blkdelta;
687 		msbp++;
688 	}
689 
690 	/* calculate free realtime extents delta */
691 	if (tp->t_rtx_res > 0)
692 		rtxdelta = tp->t_rtx_res;
693 
694 	if ((tp->t_frextents_delta != 0) &&
695 	    (tp->t_flags & XFS_TRANS_SB_DIRTY))
696 		rtxdelta += tp->t_frextents_delta;
697 
698 	if (rtxdelta != 0) {
699 		msbp->msb_field = XFS_SBS_FREXTENTS;
700 		msbp->msb_delta = rtxdelta;
701 		msbp++;
702 	}
703 
704 	/* apply remaining deltas */
705 
706 	if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
707 	     (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
708 		if (tp->t_icount_delta != 0) {
709 			msbp->msb_field = XFS_SBS_ICOUNT;
710 			msbp->msb_delta = tp->t_icount_delta;
711 			msbp++;
712 		}
713 		if (tp->t_ifree_delta != 0) {
714 			msbp->msb_field = XFS_SBS_IFREE;
715 			msbp->msb_delta = tp->t_ifree_delta;
716 			msbp++;
717 		}
718 	}
719 
720 	if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
721 		if (tp->t_dblocks_delta != 0) {
722 			msbp->msb_field = XFS_SBS_DBLOCKS;
723 			msbp->msb_delta = tp->t_dblocks_delta;
724 			msbp++;
725 		}
726 		if (tp->t_agcount_delta != 0) {
727 			msbp->msb_field = XFS_SBS_AGCOUNT;
728 			msbp->msb_delta = tp->t_agcount_delta;
729 			msbp++;
730 		}
731 		if (tp->t_imaxpct_delta != 0) {
732 			msbp->msb_field = XFS_SBS_IMAX_PCT;
733 			msbp->msb_delta = tp->t_imaxpct_delta;
734 			msbp++;
735 		}
736 		if (tp->t_rextsize_delta != 0) {
737 			msbp->msb_field = XFS_SBS_REXTSIZE;
738 			msbp->msb_delta = tp->t_rextsize_delta;
739 			msbp++;
740 		}
741 		if (tp->t_rbmblocks_delta != 0) {
742 			msbp->msb_field = XFS_SBS_RBMBLOCKS;
743 			msbp->msb_delta = tp->t_rbmblocks_delta;
744 			msbp++;
745 		}
746 		if (tp->t_rblocks_delta != 0) {
747 			msbp->msb_field = XFS_SBS_RBLOCKS;
748 			msbp->msb_delta = tp->t_rblocks_delta;
749 			msbp++;
750 		}
751 		if (tp->t_rextents_delta != 0) {
752 			msbp->msb_field = XFS_SBS_REXTENTS;
753 			msbp->msb_delta = tp->t_rextents_delta;
754 			msbp++;
755 		}
756 		if (tp->t_rextslog_delta != 0) {
757 			msbp->msb_field = XFS_SBS_REXTSLOG;
758 			msbp->msb_delta = tp->t_rextslog_delta;
759 			msbp++;
760 		}
761 	}
762 
763 	/*
764 	 * If we need to change anything, do it.
765 	 */
766 	if (msbp > msb) {
767 		error = xfs_mod_incore_sb_batch(tp->t_mountp, msb,
768 			(uint)(msbp - msb), rsvd);
769 		ASSERT(error == 0);
770 	}
771 }
772 
773 
774 /*
775  * xfs_trans_commit
776  *
777  * Commit the given transaction to the log a/synchronously.
778  *
779  * XFS disk error handling mechanism is not based on a typical
780  * transaction abort mechanism. Logically after the filesystem
781  * gets marked 'SHUTDOWN', we can't let any new transactions
782  * be durable - ie. committed to disk - because some metadata might
783  * be inconsistent. In such cases, this returns an error, and the
784  * caller may assume that all locked objects joined to the transaction
785  * have already been unlocked as if the commit had succeeded.
786  * Do not reference the transaction structure after this call.
787  */
788  /*ARGSUSED*/
789 int
790 _xfs_trans_commit(
791 	xfs_trans_t	*tp,
792 	uint		flags,
793 	int		*log_flushed)
794 {
795 	xfs_log_iovec_t		*log_vector;
796 	int			nvec;
797 	xfs_mount_t		*mp;
798 	xfs_lsn_t		commit_lsn;
799 	/* REFERENCED */
800 	int			error;
801 	int			log_flags;
802 	int			sync;
803 #define	XFS_TRANS_LOGVEC_COUNT	16
804 	xfs_log_iovec_t		log_vector_fast[XFS_TRANS_LOGVEC_COUNT];
805 	void			*commit_iclog;
806 	int			shutdown;
807 
808 	commit_lsn = -1;
809 
810 	/*
811 	 * Determine whether this commit is releasing a permanent
812 	 * log reservation or not.
813 	 */
814 	if (flags & XFS_TRANS_RELEASE_LOG_RES) {
815 		ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
816 		log_flags = XFS_LOG_REL_PERM_RESERV;
817 	} else {
818 		log_flags = 0;
819 	}
820 	mp = tp->t_mountp;
821 
822 	/*
823 	 * If there is nothing to be logged by the transaction,
824 	 * then unlock all of the items associated with the
825 	 * transaction and free the transaction structure.
826 	 * Also make sure to return any reserved blocks to
827 	 * the free pool.
828 	 */
829 shut_us_down:
830 	shutdown = XFS_FORCED_SHUTDOWN(mp) ? EIO : 0;
831 	if (!(tp->t_flags & XFS_TRANS_DIRTY) || shutdown) {
832 		xfs_trans_unreserve_and_mod_sb(tp);
833 		/*
834 		 * It is indeed possible for the transaction to be
835 		 * not dirty but the dqinfo portion to be. All that
836 		 * means is that we have some (non-persistent) quota
837 		 * reservations that need to be unreserved.
838 		 */
839 		XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp);
840 		if (tp->t_ticket) {
841 			commit_lsn = xfs_log_done(mp, tp->t_ticket,
842 							NULL, log_flags);
843 			if (commit_lsn == -1 && !shutdown)
844 				shutdown = XFS_ERROR(EIO);
845 		}
846 		current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
847 		xfs_trans_free_items(tp, shutdown? XFS_TRANS_ABORT : 0);
848 		xfs_trans_free_busy(tp);
849 		xfs_trans_free(tp);
850 		XFS_STATS_INC(xs_trans_empty);
851 		return (shutdown);
852 	}
853 	ASSERT(tp->t_ticket != NULL);
854 
855 	/*
856 	 * If we need to update the superblock, then do it now.
857 	 */
858 	if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
859 		xfs_trans_apply_sb_deltas(tp);
860 	}
861 	XFS_TRANS_APPLY_DQUOT_DELTAS(mp, tp);
862 
863 	/*
864 	 * Ask each log item how many log_vector entries it will
865 	 * need so we can figure out how many to allocate.
866 	 * Try to avoid the kmem_alloc() call in the common case
867 	 * by using a vector from the stack when it fits.
868 	 */
869 	nvec = xfs_trans_count_vecs(tp);
870 	if (nvec == 0) {
871 		xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
872 		goto shut_us_down;
873 	} else if (nvec <= XFS_TRANS_LOGVEC_COUNT) {
874 		log_vector = log_vector_fast;
875 	} else {
876 		log_vector = (xfs_log_iovec_t *)kmem_alloc(nvec *
877 						   sizeof(xfs_log_iovec_t),
878 						   KM_SLEEP);
879 	}
880 
881 	/*
882 	 * Fill in the log_vector and pin the logged items, and
883 	 * then write the transaction to the log.
884 	 */
885 	xfs_trans_fill_vecs(tp, log_vector);
886 
887 	error = xfs_log_write(mp, log_vector, nvec, tp->t_ticket, &(tp->t_lsn));
888 
889 	/*
890 	 * The transaction is committed incore here, and can go out to disk
891 	 * at any time after this call.  However, all the items associated
892 	 * with the transaction are still locked and pinned in memory.
893 	 */
894 	commit_lsn = xfs_log_done(mp, tp->t_ticket, &commit_iclog, log_flags);
895 
896 	tp->t_commit_lsn = commit_lsn;
897 	if (nvec > XFS_TRANS_LOGVEC_COUNT) {
898 		kmem_free(log_vector, nvec * sizeof(xfs_log_iovec_t));
899 	}
900 
901 	/*
902 	 * If we got a log write error. Unpin the logitems that we
903 	 * had pinned, clean up, free trans structure, and return error.
904 	 */
905 	if (error || commit_lsn == -1) {
906 		current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
907 		xfs_trans_uncommit(tp, flags|XFS_TRANS_ABORT);
908 		return XFS_ERROR(EIO);
909 	}
910 
911 	/*
912 	 * Once the transaction has committed, unused
913 	 * reservations need to be released and changes to
914 	 * the superblock need to be reflected in the in-core
915 	 * version.  Do that now.
916 	 */
917 	xfs_trans_unreserve_and_mod_sb(tp);
918 
919 	sync = tp->t_flags & XFS_TRANS_SYNC;
920 
921 	/*
922 	 * Tell the LM to call the transaction completion routine
923 	 * when the log write with LSN commit_lsn completes (e.g.
924 	 * when the transaction commit really hits the on-disk log).
925 	 * After this call we cannot reference tp, because the call
926 	 * can happen at any time and the call will free the transaction
927 	 * structure pointed to by tp.  The only case where we call
928 	 * the completion routine (xfs_trans_committed) directly is
929 	 * if the log is turned off on a debug kernel or we're
930 	 * running in simulation mode (the log is explicitly turned
931 	 * off).
932 	 */
933 	tp->t_logcb.cb_func = (void(*)(void*, int))xfs_trans_committed;
934 	tp->t_logcb.cb_arg = tp;
935 
936 	/*
937 	 * We need to pass the iclog buffer which was used for the
938 	 * transaction commit record into this function, and attach
939 	 * the callback to it. The callback must be attached before
940 	 * the items are unlocked to avoid racing with other threads
941 	 * waiting for an item to unlock.
942 	 */
943 	shutdown = xfs_log_notify(mp, commit_iclog, &(tp->t_logcb));
944 
945 	/*
946 	 * Mark this thread as no longer being in a transaction
947 	 */
948 	current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
949 
950 	/*
951 	 * Once all the items of the transaction have been copied
952 	 * to the in core log and the callback is attached, the
953 	 * items can be unlocked.
954 	 *
955 	 * This will free descriptors pointing to items which were
956 	 * not logged since there is nothing more to do with them.
957 	 * For items which were logged, we will keep pointers to them
958 	 * so they can be unpinned after the transaction commits to disk.
959 	 * This will also stamp each modified meta-data item with
960 	 * the commit lsn of this transaction for dependency tracking
961 	 * purposes.
962 	 */
963 	xfs_trans_unlock_items(tp, commit_lsn);
964 
965 	/*
966 	 * If we detected a log error earlier, finish committing
967 	 * the transaction now (unpin log items, etc).
968 	 *
969 	 * Order is critical here, to avoid using the transaction
970 	 * pointer after its been freed (by xfs_trans_committed
971 	 * either here now, or as a callback).  We cannot do this
972 	 * step inside xfs_log_notify as was done earlier because
973 	 * of this issue.
974 	 */
975 	if (shutdown)
976 		xfs_trans_committed(tp, XFS_LI_ABORTED);
977 
978 	/*
979 	 * Now that the xfs_trans_committed callback has been attached,
980 	 * and the items are released we can finally allow the iclog to
981 	 * go to disk.
982 	 */
983 	error = xfs_log_release_iclog(mp, commit_iclog);
984 
985 	/*
986 	 * If the transaction needs to be synchronous, then force the
987 	 * log out now and wait for it.
988 	 */
989 	if (sync) {
990 		if (!error) {
991 			error = _xfs_log_force(mp, commit_lsn,
992 				      XFS_LOG_FORCE | XFS_LOG_SYNC,
993 				      log_flushed);
994 		}
995 		XFS_STATS_INC(xs_trans_sync);
996 	} else {
997 		XFS_STATS_INC(xs_trans_async);
998 	}
999 
1000 	return (error);
1001 }
1002 
1003 
1004 /*
1005  * Total up the number of log iovecs needed to commit this
1006  * transaction.  The transaction itself needs one for the
1007  * transaction header.  Ask each dirty item in turn how many
1008  * it needs to get the total.
1009  */
1010 STATIC uint
1011 xfs_trans_count_vecs(
1012 	xfs_trans_t	*tp)
1013 {
1014 	int			nvecs;
1015 	xfs_log_item_desc_t	*lidp;
1016 
1017 	nvecs = 1;
1018 	lidp = xfs_trans_first_item(tp);
1019 	ASSERT(lidp != NULL);
1020 
1021 	/* In the non-debug case we need to start bailing out if we
1022 	 * didn't find a log_item here, return zero and let trans_commit
1023 	 * deal with it.
1024 	 */
1025 	if (lidp == NULL)
1026 		return 0;
1027 
1028 	while (lidp != NULL) {
1029 		/*
1030 		 * Skip items which aren't dirty in this transaction.
1031 		 */
1032 		if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
1033 			lidp = xfs_trans_next_item(tp, lidp);
1034 			continue;
1035 		}
1036 		lidp->lid_size = IOP_SIZE(lidp->lid_item);
1037 		nvecs += lidp->lid_size;
1038 		lidp = xfs_trans_next_item(tp, lidp);
1039 	}
1040 
1041 	return nvecs;
1042 }
1043 
1044 /*
1045  * Called from the trans_commit code when we notice that
1046  * the filesystem is in the middle of a forced shutdown.
1047  */
1048 STATIC void
1049 xfs_trans_uncommit(
1050 	xfs_trans_t	*tp,
1051 	uint		flags)
1052 {
1053 	xfs_log_item_desc_t	*lidp;
1054 
1055 	for (lidp = xfs_trans_first_item(tp);
1056 	     lidp != NULL;
1057 	     lidp = xfs_trans_next_item(tp, lidp)) {
1058 		/*
1059 		 * Unpin all but those that aren't dirty.
1060 		 */
1061 		if (lidp->lid_flags & XFS_LID_DIRTY)
1062 			IOP_UNPIN_REMOVE(lidp->lid_item, tp);
1063 	}
1064 
1065 	xfs_trans_unreserve_and_mod_sb(tp);
1066 	XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(tp->t_mountp, tp);
1067 
1068 	xfs_trans_free_items(tp, flags);
1069 	xfs_trans_free_busy(tp);
1070 	xfs_trans_free(tp);
1071 }
1072 
1073 /*
1074  * Fill in the vector with pointers to data to be logged
1075  * by this transaction.  The transaction header takes
1076  * the first vector, and then each dirty item takes the
1077  * number of vectors it indicated it needed in xfs_trans_count_vecs().
1078  *
1079  * As each item fills in the entries it needs, also pin the item
1080  * so that it cannot be flushed out until the log write completes.
1081  */
1082 STATIC void
1083 xfs_trans_fill_vecs(
1084 	xfs_trans_t		*tp,
1085 	xfs_log_iovec_t		*log_vector)
1086 {
1087 	xfs_log_item_desc_t	*lidp;
1088 	xfs_log_iovec_t		*vecp;
1089 	uint			nitems;
1090 
1091 	/*
1092 	 * Skip over the entry for the transaction header, we'll
1093 	 * fill that in at the end.
1094 	 */
1095 	vecp = log_vector + 1;		/* pointer arithmetic */
1096 
1097 	nitems = 0;
1098 	lidp = xfs_trans_first_item(tp);
1099 	ASSERT(lidp != NULL);
1100 	while (lidp != NULL) {
1101 		/*
1102 		 * Skip items which aren't dirty in this transaction.
1103 		 */
1104 		if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
1105 			lidp = xfs_trans_next_item(tp, lidp);
1106 			continue;
1107 		}
1108 		/*
1109 		 * The item may be marked dirty but not log anything.
1110 		 * This can be used to get called when a transaction
1111 		 * is committed.
1112 		 */
1113 		if (lidp->lid_size) {
1114 			nitems++;
1115 		}
1116 		IOP_FORMAT(lidp->lid_item, vecp);
1117 		vecp += lidp->lid_size;		/* pointer arithmetic */
1118 		IOP_PIN(lidp->lid_item);
1119 		lidp = xfs_trans_next_item(tp, lidp);
1120 	}
1121 
1122 	/*
1123 	 * Now that we've counted the number of items in this
1124 	 * transaction, fill in the transaction header.
1125 	 */
1126 	tp->t_header.th_magic = XFS_TRANS_HEADER_MAGIC;
1127 	tp->t_header.th_type = tp->t_type;
1128 	tp->t_header.th_num_items = nitems;
1129 	log_vector->i_addr = (xfs_caddr_t)&tp->t_header;
1130 	log_vector->i_len = sizeof(xfs_trans_header_t);
1131 	XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_TRANSHDR);
1132 }
1133 
1134 
1135 /*
1136  * Unlock all of the transaction's items and free the transaction.
1137  * The transaction must not have modified any of its items, because
1138  * there is no way to restore them to their previous state.
1139  *
1140  * If the transaction has made a log reservation, make sure to release
1141  * it as well.
1142  */
1143 void
1144 xfs_trans_cancel(
1145 	xfs_trans_t		*tp,
1146 	int			flags)
1147 {
1148 	int			log_flags;
1149 #ifdef DEBUG
1150 	xfs_log_item_chunk_t	*licp;
1151 	xfs_log_item_desc_t	*lidp;
1152 	xfs_log_item_t		*lip;
1153 	int			i;
1154 #endif
1155 	xfs_mount_t		*mp = tp->t_mountp;
1156 
1157 	/*
1158 	 * See if the caller is being too lazy to figure out if
1159 	 * the transaction really needs an abort.
1160 	 */
1161 	if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY))
1162 		flags &= ~XFS_TRANS_ABORT;
1163 	/*
1164 	 * See if the caller is relying on us to shut down the
1165 	 * filesystem.  This happens in paths where we detect
1166 	 * corruption and decide to give up.
1167 	 */
1168 	if ((tp->t_flags & XFS_TRANS_DIRTY) && !XFS_FORCED_SHUTDOWN(mp)) {
1169 		XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
1170 		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1171 	}
1172 #ifdef DEBUG
1173 	if (!(flags & XFS_TRANS_ABORT)) {
1174 		licp = &(tp->t_items);
1175 		while (licp != NULL) {
1176 			lidp = licp->lic_descs;
1177 			for (i = 0; i < licp->lic_unused; i++, lidp++) {
1178 				if (XFS_LIC_ISFREE(licp, i)) {
1179 					continue;
1180 				}
1181 
1182 				lip = lidp->lid_item;
1183 				if (!XFS_FORCED_SHUTDOWN(mp))
1184 					ASSERT(!(lip->li_type == XFS_LI_EFD));
1185 			}
1186 			licp = licp->lic_next;
1187 		}
1188 	}
1189 #endif
1190 	xfs_trans_unreserve_and_mod_sb(tp);
1191 	XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp);
1192 
1193 	if (tp->t_ticket) {
1194 		if (flags & XFS_TRANS_RELEASE_LOG_RES) {
1195 			ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
1196 			log_flags = XFS_LOG_REL_PERM_RESERV;
1197 		} else {
1198 			log_flags = 0;
1199 		}
1200 		xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
1201 	}
1202 
1203 	/* mark this thread as no longer being in a transaction */
1204 	current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
1205 
1206 	xfs_trans_free_items(tp, flags);
1207 	xfs_trans_free_busy(tp);
1208 	xfs_trans_free(tp);
1209 }
1210 
1211 
1212 /*
1213  * Free the transaction structure.  If there is more clean up
1214  * to do when the structure is freed, add it here.
1215  */
1216 STATIC void
1217 xfs_trans_free(
1218 	xfs_trans_t	*tp)
1219 {
1220 	atomic_dec(&tp->t_mountp->m_active_trans);
1221 	XFS_TRANS_FREE_DQINFO(tp->t_mountp, tp);
1222 	kmem_zone_free(xfs_trans_zone, tp);
1223 }
1224 
1225 
1226 /*
1227  * THIS SHOULD BE REWRITTEN TO USE xfs_trans_next_item().
1228  *
1229  * This is typically called by the LM when a transaction has been fully
1230  * committed to disk.  It needs to unpin the items which have
1231  * been logged by the transaction and update their positions
1232  * in the AIL if necessary.
1233  * This also gets called when the transactions didn't get written out
1234  * because of an I/O error. Abortflag & XFS_LI_ABORTED is set then.
1235  *
1236  * Call xfs_trans_chunk_committed() to process the items in
1237  * each chunk.
1238  */
1239 STATIC void
1240 xfs_trans_committed(
1241 	xfs_trans_t	*tp,
1242 	int		abortflag)
1243 {
1244 	xfs_log_item_chunk_t	*licp;
1245 	xfs_log_item_chunk_t	*next_licp;
1246 	xfs_log_busy_chunk_t	*lbcp;
1247 	xfs_log_busy_slot_t	*lbsp;
1248 	int			i;
1249 
1250 	/*
1251 	 * Call the transaction's completion callback if there
1252 	 * is one.
1253 	 */
1254 	if (tp->t_callback != NULL) {
1255 		tp->t_callback(tp, tp->t_callarg);
1256 	}
1257 
1258 	/*
1259 	 * Special case the chunk embedded in the transaction.
1260 	 */
1261 	licp = &(tp->t_items);
1262 	if (!(XFS_LIC_ARE_ALL_FREE(licp))) {
1263 		xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag);
1264 	}
1265 
1266 	/*
1267 	 * Process the items in each chunk in turn.
1268 	 */
1269 	licp = licp->lic_next;
1270 	while (licp != NULL) {
1271 		ASSERT(!XFS_LIC_ARE_ALL_FREE(licp));
1272 		xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag);
1273 		next_licp = licp->lic_next;
1274 		kmem_free(licp, sizeof(xfs_log_item_chunk_t));
1275 		licp = next_licp;
1276 	}
1277 
1278 	/*
1279 	 * Clear all the per-AG busy list items listed in this transaction
1280 	 */
1281 	lbcp = &tp->t_busy;
1282 	while (lbcp != NULL) {
1283 		for (i = 0, lbsp = lbcp->lbc_busy; i < lbcp->lbc_unused; i++, lbsp++) {
1284 			if (!XFS_LBC_ISFREE(lbcp, i)) {
1285 				xfs_alloc_clear_busy(tp, lbsp->lbc_ag,
1286 						     lbsp->lbc_idx);
1287 			}
1288 		}
1289 		lbcp = lbcp->lbc_next;
1290 	}
1291 	xfs_trans_free_busy(tp);
1292 
1293 	/*
1294 	 * That's it for the transaction structure.  Free it.
1295 	 */
1296 	xfs_trans_free(tp);
1297 }
1298 
1299 /*
1300  * This is called to perform the commit processing for each
1301  * item described by the given chunk.
1302  *
1303  * The commit processing consists of unlocking items which were
1304  * held locked with the SYNC_UNLOCK attribute, calling the committed
1305  * routine of each logged item, updating the item's position in the AIL
1306  * if necessary, and unpinning each item.  If the committed routine
1307  * returns -1, then do nothing further with the item because it
1308  * may have been freed.
1309  *
1310  * Since items are unlocked when they are copied to the incore
1311  * log, it is possible for two transactions to be completing
1312  * and manipulating the same item simultaneously.  The AIL lock
1313  * will protect the lsn field of each item.  The value of this
1314  * field can never go backwards.
1315  *
1316  * We unpin the items after repositioning them in the AIL, because
1317  * otherwise they could be immediately flushed and we'd have to race
1318  * with the flusher trying to pull the item from the AIL as we add it.
1319  */
1320 STATIC void
1321 xfs_trans_chunk_committed(
1322 	xfs_log_item_chunk_t	*licp,
1323 	xfs_lsn_t		lsn,
1324 	int			aborted)
1325 {
1326 	xfs_log_item_desc_t	*lidp;
1327 	xfs_log_item_t		*lip;
1328 	xfs_lsn_t		item_lsn;
1329 	struct xfs_mount	*mp;
1330 	int			i;
1331 	SPLDECL(s);
1332 
1333 	lidp = licp->lic_descs;
1334 	for (i = 0; i < licp->lic_unused; i++, lidp++) {
1335 		if (XFS_LIC_ISFREE(licp, i)) {
1336 			continue;
1337 		}
1338 
1339 		lip = lidp->lid_item;
1340 		if (aborted)
1341 			lip->li_flags |= XFS_LI_ABORTED;
1342 
1343 		/*
1344 		 * Send in the ABORTED flag to the COMMITTED routine
1345 		 * so that it knows whether the transaction was aborted
1346 		 * or not.
1347 		 */
1348 		item_lsn = IOP_COMMITTED(lip, lsn);
1349 
1350 		/*
1351 		 * If the committed routine returns -1, make
1352 		 * no more references to the item.
1353 		 */
1354 		if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0) {
1355 			continue;
1356 		}
1357 
1358 		/*
1359 		 * If the returned lsn is greater than what it
1360 		 * contained before, update the location of the
1361 		 * item in the AIL.  If it is not, then do nothing.
1362 		 * Items can never move backwards in the AIL.
1363 		 *
1364 		 * While the new lsn should usually be greater, it
1365 		 * is possible that a later transaction completing
1366 		 * simultaneously with an earlier one using the
1367 		 * same item could complete first with a higher lsn.
1368 		 * This would cause the earlier transaction to fail
1369 		 * the test below.
1370 		 */
1371 		mp = lip->li_mountp;
1372 		AIL_LOCK(mp,s);
1373 		if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0) {
1374 			/*
1375 			 * This will set the item's lsn to item_lsn
1376 			 * and update the position of the item in
1377 			 * the AIL.
1378 			 *
1379 			 * xfs_trans_update_ail() drops the AIL lock.
1380 			 */
1381 			xfs_trans_update_ail(mp, lip, item_lsn, s);
1382 		} else {
1383 			AIL_UNLOCK(mp, s);
1384 		}
1385 
1386 		/*
1387 		 * Now that we've repositioned the item in the AIL,
1388 		 * unpin it so it can be flushed. Pass information
1389 		 * about buffer stale state down from the log item
1390 		 * flags, if anyone else stales the buffer we do not
1391 		 * want to pay any attention to it.
1392 		 */
1393 		IOP_UNPIN(lip, lidp->lid_flags & XFS_LID_BUF_STALE);
1394 	}
1395 }
1396