1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * resize.c
5 *
6 * volume resize.
7 * Inspired by ext3/resize.c.
8 *
9 * Copyright (C) 2007 Oracle. All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public
22 * License along with this program; if not, write to the
23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 * Boston, MA 021110-1307, USA.
25 */
26
27 #include <linux/fs.h>
28 #include <linux/types.h>
29
30 #include <cluster/masklog.h>
31
32 #include "ocfs2.h"
33
34 #include "alloc.h"
35 #include "dlmglue.h"
36 #include "inode.h"
37 #include "journal.h"
38 #include "super.h"
39 #include "sysfile.h"
40 #include "uptodate.h"
41 #include "ocfs2_trace.h"
42
43 #include "buffer_head_io.h"
44 #include "suballoc.h"
45 #include "resize.h"
46
47 /*
48 * Check whether there are new backup superblocks exist
49 * in the last group. If there are some, mark them or clear
50 * them in the bitmap.
51 *
52 * Return how many backups we find in the last group.
53 */
ocfs2_calc_new_backup_super(struct inode * inode,struct ocfs2_group_desc * gd,int new_clusters,u32 first_new_cluster,u16 cl_cpg,int set)54 static u16 ocfs2_calc_new_backup_super(struct inode *inode,
55 struct ocfs2_group_desc *gd,
56 int new_clusters,
57 u32 first_new_cluster,
58 u16 cl_cpg,
59 int set)
60 {
61 int i;
62 u16 backups = 0;
63 u32 cluster;
64 u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
65
66 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
67 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
68 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
69
70 gd_blkno = ocfs2_which_cluster_group(inode, cluster);
71 if (gd_blkno < lgd_blkno)
72 continue;
73 else if (gd_blkno > lgd_blkno)
74 break;
75
76 if (set)
77 ocfs2_set_bit(cluster % cl_cpg,
78 (unsigned long *)gd->bg_bitmap);
79 else
80 ocfs2_clear_bit(cluster % cl_cpg,
81 (unsigned long *)gd->bg_bitmap);
82 backups++;
83 }
84
85 return backups;
86 }
87
ocfs2_update_last_group_and_inode(handle_t * handle,struct inode * bm_inode,struct buffer_head * bm_bh,struct buffer_head * group_bh,u32 first_new_cluster,int new_clusters)88 static int ocfs2_update_last_group_and_inode(handle_t *handle,
89 struct inode *bm_inode,
90 struct buffer_head *bm_bh,
91 struct buffer_head *group_bh,
92 u32 first_new_cluster,
93 int new_clusters)
94 {
95 int ret = 0;
96 struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
97 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
98 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
99 struct ocfs2_chain_rec *cr;
100 struct ocfs2_group_desc *group;
101 u16 chain, num_bits, backups = 0;
102 u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
103 u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
104
105 trace_ocfs2_update_last_group_and_inode(new_clusters,
106 first_new_cluster);
107
108 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
109 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
110 if (ret < 0) {
111 mlog_errno(ret);
112 goto out;
113 }
114
115 group = (struct ocfs2_group_desc *)group_bh->b_data;
116
117 /* update the group first. */
118 num_bits = new_clusters * cl_bpc;
119 le16_add_cpu(&group->bg_bits, num_bits);
120 le16_add_cpu(&group->bg_free_bits_count, num_bits);
121
122 /*
123 * check whether there are some new backup superblocks exist in
124 * this group and update the group bitmap accordingly.
125 */
126 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
127 OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
128 backups = ocfs2_calc_new_backup_super(bm_inode,
129 group,
130 new_clusters,
131 first_new_cluster,
132 cl_cpg, 1);
133 le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
134 }
135
136 ocfs2_journal_dirty(handle, group_bh);
137
138 /* update the inode accordingly. */
139 ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
140 OCFS2_JOURNAL_ACCESS_WRITE);
141 if (ret < 0) {
142 mlog_errno(ret);
143 goto out_rollback;
144 }
145
146 chain = le16_to_cpu(group->bg_chain);
147 cr = (&cl->cl_recs[chain]);
148 le32_add_cpu(&cr->c_total, num_bits);
149 le32_add_cpu(&cr->c_free, num_bits);
150 le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
151 le32_add_cpu(&fe->i_clusters, new_clusters);
152
153 if (backups) {
154 le32_add_cpu(&cr->c_free, -1 * backups);
155 le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
156 }
157
158 spin_lock(&OCFS2_I(bm_inode)->ip_lock);
159 OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
160 le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits);
161 spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
162 i_size_write(bm_inode, le64_to_cpu(fe->i_size));
163
164 ocfs2_journal_dirty(handle, bm_bh);
165
166 out_rollback:
167 if (ret < 0) {
168 ocfs2_calc_new_backup_super(bm_inode,
169 group,
170 new_clusters,
171 first_new_cluster,
172 cl_cpg, 0);
173 le16_add_cpu(&group->bg_free_bits_count, backups);
174 le16_add_cpu(&group->bg_bits, -1 * num_bits);
175 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
176 }
177 out:
178 if (ret)
179 mlog_errno(ret);
180 return ret;
181 }
182
update_backups(struct inode * inode,u32 clusters,char * data)183 static int update_backups(struct inode * inode, u32 clusters, char *data)
184 {
185 int i, ret = 0;
186 u32 cluster;
187 u64 blkno;
188 struct buffer_head *backup = NULL;
189 struct ocfs2_dinode *backup_di = NULL;
190 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
191
192 /* calculate the real backups we need to update. */
193 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
194 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
195 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
196 if (cluster > clusters)
197 break;
198
199 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
200 if (ret < 0) {
201 mlog_errno(ret);
202 break;
203 }
204
205 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
206
207 backup_di = (struct ocfs2_dinode *)backup->b_data;
208 backup_di->i_blkno = cpu_to_le64(blkno);
209
210 ret = ocfs2_write_super_or_backup(osb, backup);
211 brelse(backup);
212 backup = NULL;
213 if (ret < 0) {
214 mlog_errno(ret);
215 break;
216 }
217 }
218
219 return ret;
220 }
221
ocfs2_update_super_and_backups(struct inode * inode,int new_clusters)222 static void ocfs2_update_super_and_backups(struct inode *inode,
223 int new_clusters)
224 {
225 int ret;
226 u32 clusters = 0;
227 struct buffer_head *super_bh = NULL;
228 struct ocfs2_dinode *super_di = NULL;
229 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
230
231 /*
232 * update the superblock last.
233 * It doesn't matter if the write failed.
234 */
235 ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
236 &super_bh);
237 if (ret < 0) {
238 mlog_errno(ret);
239 goto out;
240 }
241
242 super_di = (struct ocfs2_dinode *)super_bh->b_data;
243 le32_add_cpu(&super_di->i_clusters, new_clusters);
244 clusters = le32_to_cpu(super_di->i_clusters);
245
246 ret = ocfs2_write_super_or_backup(osb, super_bh);
247 if (ret < 0) {
248 mlog_errno(ret);
249 goto out;
250 }
251
252 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
253 ret = update_backups(inode, clusters, super_bh->b_data);
254
255 out:
256 brelse(super_bh);
257 if (ret)
258 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
259 " during fs resize. This condition is not fatal,"
260 " but fsck.ocfs2 should be run to fix it\n",
261 osb->dev_str);
262 return;
263 }
264
265 /*
266 * Extend the filesystem to the new number of clusters specified. This entry
267 * point is only used to extend the current filesystem to the end of the last
268 * existing group.
269 */
ocfs2_group_extend(struct inode * inode,int new_clusters)270 int ocfs2_group_extend(struct inode * inode, int new_clusters)
271 {
272 int ret;
273 handle_t *handle;
274 struct buffer_head *main_bm_bh = NULL;
275 struct buffer_head *group_bh = NULL;
276 struct inode *main_bm_inode = NULL;
277 struct ocfs2_dinode *fe = NULL;
278 struct ocfs2_group_desc *group = NULL;
279 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
280 u16 cl_bpc;
281 u32 first_new_cluster;
282 u64 lgd_blkno;
283
284 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
285 return -EROFS;
286
287 if (new_clusters < 0)
288 return -EINVAL;
289 else if (new_clusters == 0)
290 return 0;
291
292 main_bm_inode = ocfs2_get_system_file_inode(osb,
293 GLOBAL_BITMAP_SYSTEM_INODE,
294 OCFS2_INVALID_SLOT);
295 if (!main_bm_inode) {
296 ret = -EINVAL;
297 mlog_errno(ret);
298 goto out;
299 }
300
301 mutex_lock(&main_bm_inode->i_mutex);
302
303 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
304 if (ret < 0) {
305 mlog_errno(ret);
306 goto out_mutex;
307 }
308
309 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
310
311 /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
312 * so any corruption is a code bug. */
313 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
314
315 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
316 ocfs2_group_bitmap_size(osb->sb, 0,
317 osb->s_feature_incompat) * 8) {
318 mlog(ML_ERROR, "The disk is too old and small. "
319 "Force to do offline resize.");
320 ret = -EINVAL;
321 goto out_unlock;
322 }
323
324 first_new_cluster = le32_to_cpu(fe->i_clusters);
325 lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
326 first_new_cluster - 1);
327
328 ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
329 &group_bh);
330 if (ret < 0) {
331 mlog_errno(ret);
332 goto out_unlock;
333 }
334 group = (struct ocfs2_group_desc *)group_bh->b_data;
335
336 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
337 if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
338 le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
339 ret = -EINVAL;
340 goto out_unlock;
341 }
342
343
344 trace_ocfs2_group_extend(
345 (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
346
347 handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
348 if (IS_ERR(handle)) {
349 mlog_errno(PTR_ERR(handle));
350 ret = -EINVAL;
351 goto out_unlock;
352 }
353
354 /* update the last group descriptor and inode. */
355 ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
356 main_bm_bh, group_bh,
357 first_new_cluster,
358 new_clusters);
359 if (ret) {
360 mlog_errno(ret);
361 goto out_commit;
362 }
363
364 ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
365
366 out_commit:
367 ocfs2_commit_trans(osb, handle);
368 out_unlock:
369 brelse(group_bh);
370 brelse(main_bm_bh);
371
372 ocfs2_inode_unlock(main_bm_inode, 1);
373
374 out_mutex:
375 mutex_unlock(&main_bm_inode->i_mutex);
376 iput(main_bm_inode);
377
378 out:
379 return ret;
380 }
381
ocfs2_check_new_group(struct inode * inode,struct ocfs2_dinode * di,struct ocfs2_new_group_input * input,struct buffer_head * group_bh)382 static int ocfs2_check_new_group(struct inode *inode,
383 struct ocfs2_dinode *di,
384 struct ocfs2_new_group_input *input,
385 struct buffer_head *group_bh)
386 {
387 int ret;
388 struct ocfs2_group_desc *gd =
389 (struct ocfs2_group_desc *)group_bh->b_data;
390 u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
391
392 ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
393 if (ret)
394 goto out;
395
396 ret = -EINVAL;
397 if (le16_to_cpu(gd->bg_chain) != input->chain)
398 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
399 "while input has %u set.\n",
400 (unsigned long long)le64_to_cpu(gd->bg_blkno),
401 le16_to_cpu(gd->bg_chain), input->chain);
402 else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
403 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
404 "input has %u clusters set\n",
405 (unsigned long long)le64_to_cpu(gd->bg_blkno),
406 le16_to_cpu(gd->bg_bits), input->clusters);
407 else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
408 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
409 "but it should have %u set\n",
410 (unsigned long long)le64_to_cpu(gd->bg_blkno),
411 le16_to_cpu(gd->bg_bits),
412 input->frees * cl_bpc);
413 else
414 ret = 0;
415
416 out:
417 return ret;
418 }
419
ocfs2_verify_group_and_input(struct inode * inode,struct ocfs2_dinode * di,struct ocfs2_new_group_input * input,struct buffer_head * group_bh)420 static int ocfs2_verify_group_and_input(struct inode *inode,
421 struct ocfs2_dinode *di,
422 struct ocfs2_new_group_input *input,
423 struct buffer_head *group_bh)
424 {
425 u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
426 u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
427 u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
428 u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
429 u32 total_clusters = le32_to_cpu(di->i_clusters);
430 int ret = -EINVAL;
431
432 if (cluster < total_clusters)
433 mlog(ML_ERROR, "add a group which is in the current volume.\n");
434 else if (input->chain >= cl_count)
435 mlog(ML_ERROR, "input chain exceeds the limit.\n");
436 else if (next_free != cl_count && next_free != input->chain)
437 mlog(ML_ERROR,
438 "the add group should be in chain %u\n", next_free);
439 else if (total_clusters + input->clusters < total_clusters)
440 mlog(ML_ERROR, "add group's clusters overflow.\n");
441 else if (input->clusters > cl_cpg)
442 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
443 else if (input->frees > input->clusters)
444 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
445 else if (total_clusters % cl_cpg != 0)
446 mlog(ML_ERROR,
447 "the last group isn't full. Use group extend first.\n");
448 else if (input->group != ocfs2_which_cluster_group(inode, cluster))
449 mlog(ML_ERROR, "group blkno is invalid\n");
450 else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
451 mlog(ML_ERROR, "group descriptor check failed.\n");
452 else
453 ret = 0;
454
455 return ret;
456 }
457
458 /* Add a new group descriptor to global_bitmap. */
ocfs2_group_add(struct inode * inode,struct ocfs2_new_group_input * input)459 int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
460 {
461 int ret;
462 handle_t *handle;
463 struct buffer_head *main_bm_bh = NULL;
464 struct inode *main_bm_inode = NULL;
465 struct ocfs2_dinode *fe = NULL;
466 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
467 struct buffer_head *group_bh = NULL;
468 struct ocfs2_group_desc *group = NULL;
469 struct ocfs2_chain_list *cl;
470 struct ocfs2_chain_rec *cr;
471 u16 cl_bpc;
472
473 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
474 return -EROFS;
475
476 main_bm_inode = ocfs2_get_system_file_inode(osb,
477 GLOBAL_BITMAP_SYSTEM_INODE,
478 OCFS2_INVALID_SLOT);
479 if (!main_bm_inode) {
480 ret = -EINVAL;
481 mlog_errno(ret);
482 goto out;
483 }
484
485 mutex_lock(&main_bm_inode->i_mutex);
486
487 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
488 if (ret < 0) {
489 mlog_errno(ret);
490 goto out_mutex;
491 }
492
493 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
494
495 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
496 ocfs2_group_bitmap_size(osb->sb, 0,
497 osb->s_feature_incompat) * 8) {
498 mlog(ML_ERROR, "The disk is too old and small."
499 " Force to do offline resize.");
500 ret = -EINVAL;
501 goto out_unlock;
502 }
503
504 ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
505 if (ret < 0) {
506 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
507 "from the device.", (unsigned long long)input->group);
508 goto out_unlock;
509 }
510
511 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
512
513 ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
514 if (ret) {
515 mlog_errno(ret);
516 goto out_unlock;
517 }
518
519 trace_ocfs2_group_add((unsigned long long)input->group,
520 input->chain, input->clusters, input->frees);
521
522 handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
523 if (IS_ERR(handle)) {
524 mlog_errno(PTR_ERR(handle));
525 ret = -EINVAL;
526 goto out_unlock;
527 }
528
529 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
530 cl = &fe->id2.i_chain;
531 cr = &cl->cl_recs[input->chain];
532
533 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
534 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
535 if (ret < 0) {
536 mlog_errno(ret);
537 goto out_commit;
538 }
539
540 group = (struct ocfs2_group_desc *)group_bh->b_data;
541 group->bg_next_group = cr->c_blkno;
542 ocfs2_journal_dirty(handle, group_bh);
543
544 ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
545 main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
546 if (ret < 0) {
547 mlog_errno(ret);
548 goto out_commit;
549 }
550
551 if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
552 le16_add_cpu(&cl->cl_next_free_rec, 1);
553 memset(cr, 0, sizeof(struct ocfs2_chain_rec));
554 }
555
556 cr->c_blkno = cpu_to_le64(input->group);
557 le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
558 le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
559
560 le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
561 le32_add_cpu(&fe->id1.bitmap1.i_used,
562 (input->clusters - input->frees) * cl_bpc);
563 le32_add_cpu(&fe->i_clusters, input->clusters);
564
565 ocfs2_journal_dirty(handle, main_bm_bh);
566
567 spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
568 OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
569 le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits);
570 spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
571 i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
572
573 ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
574
575 out_commit:
576 ocfs2_commit_trans(osb, handle);
577 out_unlock:
578 brelse(group_bh);
579 brelse(main_bm_bh);
580
581 ocfs2_inode_unlock(main_bm_inode, 1);
582
583 out_mutex:
584 mutex_unlock(&main_bm_inode->i_mutex);
585 iput(main_bm_inode);
586
587 out:
588 return ret;
589 }
590