Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 LT |
24 | #include "xfs_trans.h" |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
1da177e4 LT |
27 | #include "xfs_dir2.h" |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_mount.h" | |
30 | #include "xfs_error.h" | |
a844f451 | 31 | #include "xfs_da_btree.h" |
1da177e4 | 32 | #include "xfs_bmap_btree.h" |
a844f451 | 33 | #include "xfs_alloc_btree.h" |
1da177e4 | 34 | #include "xfs_ialloc_btree.h" |
1da177e4 | 35 | #include "xfs_dir2_sf.h" |
a844f451 | 36 | #include "xfs_attr_sf.h" |
1da177e4 LT |
37 | #include "xfs_dinode.h" |
38 | #include "xfs_inode.h" | |
a844f451 NS |
39 | #include "xfs_btree.h" |
40 | #include "xfs_ialloc.h" | |
41 | #include "xfs_alloc.h" | |
1da177e4 | 42 | #include "xfs_bmap.h" |
1da177e4 | 43 | #include "xfs_quota.h" |
a844f451 | 44 | #include "xfs_trans_priv.h" |
1da177e4 LT |
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 | ||
8f794055 | 56 | kmem_zone_t *xfs_trans_zone; |
1da177e4 LT |
57 | |
58 | ||
8f794055 NS |
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 | { | |
2ddd5928 | 85 | return XFS_CALC_LINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp); |
8f794055 NS |
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 | ||
1da177e4 LT |
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); | |
8f794055 NS |
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); | |
1da177e4 LT |
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 | { | |
34327e13 NS |
237 | vfs_wait_for_freeze(XFS_MTOVFS(mp), SB_FREEZE_TRANS); |
238 | return _xfs_trans_alloc(mp, type); | |
1da177e4 LT |
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 | ||
34327e13 | 248 | atomic_inc(&mp->m_active_trans); |
1da177e4 | 249 | |
34327e13 | 250 | tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP); |
1da177e4 LT |
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)); | |
34327e13 | 258 | return tp; |
1da177e4 LT |
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); | |
1da177e4 | 289 | ASSERT(tp->t_ticket != NULL); |
cfcbbbd0 | 290 | |
1da177e4 LT |
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; | |
59c1b082 | 297 | ntp->t_pflags = tp->t_pflags; |
1da177e4 LT |
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; | |
59c1b082 NS |
329 | int error = 0; |
330 | int rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0; | |
1da177e4 LT |
331 | |
332 | /* Mark this thread as being in a transaction */ | |
59c1b082 | 333 | current_set_flags_nested(&tp->t_pflags, PF_FSTRANS); |
1da177e4 LT |
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 | -blocks, rsvd); | |
343 | if (error != 0) { | |
59c1b082 | 344 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); |
1da177e4 LT |
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, | |
7e9c6396 | 368 | XFS_TRANSACTION, log_flags, tp->t_type); |
1da177e4 LT |
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 | -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 | blocks, rsvd); | |
414 | tp->t_blk_res = 0; | |
415 | } | |
416 | ||
59c1b082 | 417 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); |
1da177e4 | 418 | |
59c1b082 | 419 | return error; |
1da177e4 LT |
420 | } |
421 | ||
422 | ||
1da177e4 LT |
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 | void | |
432 | xfs_trans_mod_sb( | |
433 | xfs_trans_t *tp, | |
434 | uint field, | |
435 | long delta) | |
436 | { | |
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 | |
c41564b5 | 481 | * in-core superblock's counter. This should only |
1da177e4 LT |
482 | * 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 | */ | |
529 | STATIC void | |
530 | xfs_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 | /* | |
c41564b5 | 602 | * Log the whole thing, the fields are noncontiguous. |
1da177e4 LT |
603 | */ |
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 | */ | |
ba0f32d4 | 624 | STATIC void |
1da177e4 LT |
625 | xfs_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 | |
c41564b5 | 660 | * explicitly NOT applied to the in-core superblock. |
1da177e4 LT |
661 | * 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; | |
666 | msbp->msb_delta = (int)tp->t_icount_delta; | |
667 | msbp++; | |
668 | } | |
669 | if (tp->t_ifree_delta != 0) { | |
670 | msbp->msb_field = XFS_SBS_IFREE; | |
671 | msbp->msb_delta = (int)tp->t_ifree_delta; | |
672 | msbp++; | |
673 | } | |
674 | if (tp->t_fdblocks_delta != 0) { | |
675 | msbp->msb_field = XFS_SBS_FDBLOCKS; | |
676 | msbp->msb_delta = (int)tp->t_fdblocks_delta; | |
677 | msbp++; | |
678 | } | |
679 | if (tp->t_frextents_delta != 0) { | |
680 | msbp->msb_field = XFS_SBS_FREXTENTS; | |
681 | msbp->msb_delta = (int)tp->t_frextents_delta; | |
682 | msbp++; | |
683 | } | |
684 | if (tp->t_dblocks_delta != 0) { | |
685 | msbp->msb_field = XFS_SBS_DBLOCKS; | |
686 | msbp->msb_delta = (int)tp->t_dblocks_delta; | |
687 | msbp++; | |
688 | } | |
689 | if (tp->t_agcount_delta != 0) { | |
690 | msbp->msb_field = XFS_SBS_AGCOUNT; | |
691 | msbp->msb_delta = (int)tp->t_agcount_delta; | |
692 | msbp++; | |
693 | } | |
694 | if (tp->t_imaxpct_delta != 0) { | |
695 | msbp->msb_field = XFS_SBS_IMAX_PCT; | |
696 | msbp->msb_delta = (int)tp->t_imaxpct_delta; | |
697 | msbp++; | |
698 | } | |
699 | if (tp->t_rextsize_delta != 0) { | |
700 | msbp->msb_field = XFS_SBS_REXTSIZE; | |
701 | msbp->msb_delta = (int)tp->t_rextsize_delta; | |
702 | msbp++; | |
703 | } | |
704 | if (tp->t_rbmblocks_delta != 0) { | |
705 | msbp->msb_field = XFS_SBS_RBMBLOCKS; | |
706 | msbp->msb_delta = (int)tp->t_rbmblocks_delta; | |
707 | msbp++; | |
708 | } | |
709 | if (tp->t_rblocks_delta != 0) { | |
710 | msbp->msb_field = XFS_SBS_RBLOCKS; | |
711 | msbp->msb_delta = (int)tp->t_rblocks_delta; | |
712 | msbp++; | |
713 | } | |
714 | if (tp->t_rextents_delta != 0) { | |
715 | msbp->msb_field = XFS_SBS_REXTENTS; | |
716 | msbp->msb_delta = (int)tp->t_rextents_delta; | |
717 | msbp++; | |
718 | } | |
719 | if (tp->t_rextslog_delta != 0) { | |
720 | msbp->msb_field = XFS_SBS_REXTSLOG; | |
721 | msbp->msb_delta = (int)tp->t_rextslog_delta; | |
722 | 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*/ | |
752 | int | |
f538d4da | 753 | _xfs_trans_commit( |
1da177e4 LT |
754 | xfs_trans_t *tp, |
755 | uint flags, | |
f538d4da CH |
756 | xfs_lsn_t *commit_lsn_p, |
757 | int *log_flushed) | |
1da177e4 LT |
758 | { |
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]; | |
1da177e4 LT |
769 | 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 | */ | |
793 | shut_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 | } | |
59c1b082 | 810 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); |
1da177e4 LT |
811 | 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 | } | |
1da177e4 | 819 | ASSERT(tp->t_ticket != NULL); |
1da177e4 LT |
820 | |
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); | |
1da177e4 | 836 | if (nvec == 0) { |
7d04a335 | 837 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
1da177e4 | 838 | goto shut_us_down; |
cfcbbbd0 | 839 | } else if (nvec <= XFS_TRANS_LOGVEC_COUNT) { |
1da177e4 LT |
840 | 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 | ||
cfcbbbd0 | 853 | error = xfs_log_write(mp, log_vector, nvec, tp->t_ticket, &(tp->t_lsn)); |
1da177e4 | 854 | |
1da177e4 | 855 | /* |
cfcbbbd0 NS |
856 | * 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. | |
1da177e4 LT |
859 | */ |
860 | commit_lsn = xfs_log_done(mp, tp->t_ticket, &commit_iclog, log_flags); | |
1da177e4 LT |
861 | |
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) { | |
59c1b082 | 875 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); |
1da177e4 LT |
876 | 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 | */ | |
59c1b082 | 917 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); |
1da177e4 LT |
918 | |
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) { | |
f538d4da CH |
959 | if (!error) { |
960 | error = _xfs_log_force(mp, commit_lsn, | |
961 | XFS_LOG_FORCE | XFS_LOG_SYNC, | |
962 | log_flushed); | |
963 | } | |
1da177e4 LT |
964 | 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 | */ | |
979 | STATIC uint | |
980 | xfs_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 | */ | |
1017 | STATIC void | |
1018 | xfs_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 | */ | |
1051 | STATIC void | |
1052 | xfs_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); | |
7e9c6396 | 1100 | XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_TRANSHDR); |
1da177e4 LT |
1101 | } |
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 | */ | |
1112 | void | |
1113 | xfs_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 | |
0733af21 | 1124 | xfs_mount_t *mp = tp->t_mountp; |
1da177e4 LT |
1125 | |
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 | */ | |
60a204f0 | 1137 | if ((tp->t_flags & XFS_TRANS_DIRTY) && !XFS_FORCED_SHUTDOWN(mp)) { |
0733af21 | 1138 | XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp); |
7d04a335 | 1139 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); |
60a204f0 | 1140 | } |
1da177e4 LT |
1141 | #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; | |
0733af21 | 1152 | if (!XFS_FORCED_SHUTDOWN(mp)) |
1da177e4 LT |
1153 | 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); | |
0733af21 | 1160 | XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp); |
1da177e4 LT |
1161 | |
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 | } | |
0733af21 | 1169 | xfs_log_done(mp, tp->t_ticket, NULL, log_flags); |
1da177e4 LT |
1170 | } |
1171 | ||
1172 | /* mark this thread as no longer being in a transaction */ | |
59c1b082 | 1173 | current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); |
1da177e4 LT |
1174 | |
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 | */ | |
1185 | STATIC void | |
1186 | xfs_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 | */ | |
1208 | STATIC void | |
1209 | xfs_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 | */ | |
1289 | STATIC void | |
1290 | xfs_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 | } |