1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * resize.c
4 *
5 * volume resize.
6 * Inspired by ext3/resize.c.
7 *
8 * Copyright (C) 2007 Oracle. All rights reserved.
9 */
10
11 #include <linux/fs.h>
12 #include <linux/types.h>
13
14 #include <cluster/masklog.h>
15
16 #include "ocfs2.h"
17
18 #include "alloc.h"
19 #include "dlmglue.h"
20 #include "inode.h"
21 #include "journal.h"
22 #include "super.h"
23 #include "sysfile.h"
24 #include "uptodate.h"
25 #include "ocfs2_trace.h"
26
27 #include "buffer_head_io.h"
28 #include "suballoc.h"
29 #include "resize.h"
30
31 /*
32 * Check whether there are new backup superblocks exist
33 * in the last group. If there are some, mark them or clear
34 * them in the bitmap.
35 *
36 * Return how many backups we find in the last group.
37 */
ocfs2_calc_new_backup_super(struct inode * inode,struct ocfs2_group_desc * gd,u16 cl_cpg,u16 old_bg_clusters,int set)38 static u16 ocfs2_calc_new_backup_super(struct inode *inode,
39 struct ocfs2_group_desc *gd,
40 u16 cl_cpg,
41 u16 old_bg_clusters,
42 int set)
43 {
44 int i;
45 u16 backups = 0;
46 u32 cluster, lgd_cluster;
47 u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
48
49 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
50 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
51 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
52
53 gd_blkno = ocfs2_which_cluster_group(inode, cluster);
54 if (gd_blkno < lgd_blkno)
55 continue;
56 else if (gd_blkno > lgd_blkno)
57 break;
58
59 /* check if already done backup super */
60 lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno);
61 lgd_cluster += old_bg_clusters;
62 if (lgd_cluster >= cluster)
63 continue;
64
65 if (set)
66 ocfs2_set_bit(cluster % cl_cpg,
67 (unsigned long *)gd->bg_bitmap);
68 else
69 ocfs2_clear_bit(cluster % cl_cpg,
70 (unsigned long *)gd->bg_bitmap);
71 backups++;
72 }
73
74 return backups;
75 }
76
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)77 static int ocfs2_update_last_group_and_inode(handle_t *handle,
78 struct inode *bm_inode,
79 struct buffer_head *bm_bh,
80 struct buffer_head *group_bh,
81 u32 first_new_cluster,
82 int new_clusters)
83 {
84 int ret = 0;
85 struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
86 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
87 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
88 struct ocfs2_chain_rec *cr;
89 struct ocfs2_group_desc *group;
90 u16 chain, num_bits, backups = 0;
91 u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
92 u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
93 u16 old_bg_clusters;
94
95 trace_ocfs2_update_last_group_and_inode(new_clusters,
96 first_new_cluster);
97
98 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
99 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
100 if (ret < 0) {
101 mlog_errno(ret);
102 goto out;
103 }
104
105 group = (struct ocfs2_group_desc *)group_bh->b_data;
106
107 old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc;
108 /* update the group first. */
109 num_bits = new_clusters * cl_bpc;
110 le16_add_cpu(&group->bg_bits, num_bits);
111 le16_add_cpu(&group->bg_free_bits_count, num_bits);
112
113 /*
114 * check whether there are some new backup superblocks exist in
115 * this group and update the group bitmap accordingly.
116 */
117 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
118 OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
119 backups = ocfs2_calc_new_backup_super(bm_inode,
120 group,
121 cl_cpg, old_bg_clusters, 1);
122 le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
123 }
124
125 ocfs2_journal_dirty(handle, group_bh);
126
127 /* update the inode accordingly. */
128 ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
129 OCFS2_JOURNAL_ACCESS_WRITE);
130 if (ret < 0) {
131 mlog_errno(ret);
132 goto out_rollback;
133 }
134
135 chain = le16_to_cpu(group->bg_chain);
136 cr = (&cl->cl_recs[chain]);
137 le32_add_cpu(&cr->c_total, num_bits);
138 le32_add_cpu(&cr->c_free, num_bits);
139 le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
140 le32_add_cpu(&fe->i_clusters, new_clusters);
141
142 if (backups) {
143 le32_add_cpu(&cr->c_free, -1 * backups);
144 le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
145 }
146
147 spin_lock(&OCFS2_I(bm_inode)->ip_lock);
148 OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
149 le64_add_cpu(&fe->i_size, (u64)new_clusters << osb->s_clustersize_bits);
150 spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
151 i_size_write(bm_inode, le64_to_cpu(fe->i_size));
152
153 ocfs2_journal_dirty(handle, bm_bh);
154
155 out_rollback:
156 if (ret < 0) {
157 ocfs2_calc_new_backup_super(bm_inode,
158 group,
159 cl_cpg, old_bg_clusters, 0);
160 le16_add_cpu(&group->bg_free_bits_count, backups);
161 le16_add_cpu(&group->bg_bits, -1 * num_bits);
162 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
163 }
164 out:
165 if (ret)
166 mlog_errno(ret);
167 return ret;
168 }
169
update_backups(struct inode * inode,u32 clusters,char * data)170 static int update_backups(struct inode * inode, u32 clusters, char *data)
171 {
172 int i, ret = 0;
173 u32 cluster;
174 u64 blkno;
175 struct buffer_head *backup = NULL;
176 struct ocfs2_dinode *backup_di = NULL;
177 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
178
179 /* calculate the real backups we need to update. */
180 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
181 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
182 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
183 if (cluster >= clusters)
184 break;
185
186 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
187 if (ret < 0) {
188 mlog_errno(ret);
189 break;
190 }
191
192 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
193
194 backup_di = (struct ocfs2_dinode *)backup->b_data;
195 backup_di->i_blkno = cpu_to_le64(blkno);
196
197 ret = ocfs2_write_super_or_backup(osb, backup);
198 brelse(backup);
199 backup = NULL;
200 if (ret < 0) {
201 mlog_errno(ret);
202 break;
203 }
204 }
205
206 return ret;
207 }
208
ocfs2_update_super_and_backups(struct inode * inode,int new_clusters)209 static void ocfs2_update_super_and_backups(struct inode *inode,
210 int new_clusters)
211 {
212 int ret;
213 u32 clusters = 0;
214 struct buffer_head *super_bh = NULL;
215 struct ocfs2_dinode *super_di = NULL;
216 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
217
218 /*
219 * update the superblock last.
220 * It doesn't matter if the write failed.
221 */
222 ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
223 &super_bh);
224 if (ret < 0) {
225 mlog_errno(ret);
226 goto out;
227 }
228
229 super_di = (struct ocfs2_dinode *)super_bh->b_data;
230 le32_add_cpu(&super_di->i_clusters, new_clusters);
231 clusters = le32_to_cpu(super_di->i_clusters);
232
233 ret = ocfs2_write_super_or_backup(osb, super_bh);
234 if (ret < 0) {
235 mlog_errno(ret);
236 goto out;
237 }
238
239 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
240 ret = update_backups(inode, clusters, super_bh->b_data);
241
242 out:
243 brelse(super_bh);
244 if (ret)
245 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
246 " during fs resize. This condition is not fatal,"
247 " but fsck.ocfs2 should be run to fix it\n",
248 osb->dev_str);
249 return;
250 }
251
252 /*
253 * Extend the filesystem to the new number of clusters specified. This entry
254 * point is only used to extend the current filesystem to the end of the last
255 * existing group.
256 */
ocfs2_group_extend(struct inode * inode,int new_clusters)257 int ocfs2_group_extend(struct inode * inode, int new_clusters)
258 {
259 int ret;
260 handle_t *handle;
261 struct buffer_head *main_bm_bh = NULL;
262 struct buffer_head *group_bh = NULL;
263 struct inode *main_bm_inode = NULL;
264 struct ocfs2_dinode *fe = NULL;
265 struct ocfs2_group_desc *group = NULL;
266 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
267 u16 cl_bpc;
268 u32 first_new_cluster;
269 u64 lgd_blkno;
270
271 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
272 return -EROFS;
273
274 if (new_clusters < 0)
275 return -EINVAL;
276 else if (new_clusters == 0)
277 return 0;
278
279 main_bm_inode = ocfs2_get_system_file_inode(osb,
280 GLOBAL_BITMAP_SYSTEM_INODE,
281 OCFS2_INVALID_SLOT);
282 if (!main_bm_inode) {
283 ret = -EINVAL;
284 mlog_errno(ret);
285 goto out;
286 }
287
288 inode_lock(main_bm_inode);
289
290 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
291 if (ret < 0) {
292 mlog_errno(ret);
293 goto out_mutex;
294 }
295
296 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
297
298 /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
299 * so any corruption is a code bug. */
300 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
301
302 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
303 ocfs2_group_bitmap_size(osb->sb, 0,
304 osb->s_feature_incompat) * 8) {
305 mlog(ML_ERROR, "The disk is too old and small. "
306 "Force to do offline resize.");
307 ret = -EINVAL;
308 goto out_unlock;
309 }
310
311 first_new_cluster = le32_to_cpu(fe->i_clusters);
312 lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
313 first_new_cluster - 1);
314
315 ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
316 &group_bh);
317 if (ret < 0) {
318 mlog_errno(ret);
319 goto out_unlock;
320 }
321 group = (struct ocfs2_group_desc *)group_bh->b_data;
322
323 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
324 if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
325 le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
326 ret = -EINVAL;
327 goto out_unlock;
328 }
329
330
331 trace_ocfs2_group_extend(
332 (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
333
334 handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
335 if (IS_ERR(handle)) {
336 mlog_errno(PTR_ERR(handle));
337 ret = -EINVAL;
338 goto out_unlock;
339 }
340
341 /* update the last group descriptor and inode. */
342 ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
343 main_bm_bh, group_bh,
344 first_new_cluster,
345 new_clusters);
346 if (ret) {
347 mlog_errno(ret);
348 goto out_commit;
349 }
350
351 ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
352
353 out_commit:
354 ocfs2_commit_trans(osb, handle);
355 out_unlock:
356 brelse(group_bh);
357 brelse(main_bm_bh);
358
359 ocfs2_inode_unlock(main_bm_inode, 1);
360
361 out_mutex:
362 inode_unlock(main_bm_inode);
363 iput(main_bm_inode);
364
365 out:
366 return ret;
367 }
368
ocfs2_check_new_group(struct inode * inode,struct ocfs2_dinode * di,struct ocfs2_new_group_input * input,struct buffer_head * group_bh)369 static int ocfs2_check_new_group(struct inode *inode,
370 struct ocfs2_dinode *di,
371 struct ocfs2_new_group_input *input,
372 struct buffer_head *group_bh)
373 {
374 int ret;
375 struct ocfs2_group_desc *gd =
376 (struct ocfs2_group_desc *)group_bh->b_data;
377 u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
378
379 ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
380 if (ret)
381 goto out;
382
383 ret = -EINVAL;
384 if (le16_to_cpu(gd->bg_chain) != input->chain)
385 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
386 "while input has %u set.\n",
387 (unsigned long long)le64_to_cpu(gd->bg_blkno),
388 le16_to_cpu(gd->bg_chain), input->chain);
389 else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
390 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
391 "input has %u clusters set\n",
392 (unsigned long long)le64_to_cpu(gd->bg_blkno),
393 le16_to_cpu(gd->bg_bits), input->clusters);
394 else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
395 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
396 "but it should have %u set\n",
397 (unsigned long long)le64_to_cpu(gd->bg_blkno),
398 le16_to_cpu(gd->bg_bits),
399 input->frees * cl_bpc);
400 else
401 ret = 0;
402
403 out:
404 return ret;
405 }
406
ocfs2_verify_group_and_input(struct inode * inode,struct ocfs2_dinode * di,struct ocfs2_new_group_input * input,struct buffer_head * group_bh)407 static int ocfs2_verify_group_and_input(struct inode *inode,
408 struct ocfs2_dinode *di,
409 struct ocfs2_new_group_input *input,
410 struct buffer_head *group_bh)
411 {
412 u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
413 u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
414 u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
415 u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
416 u32 total_clusters = le32_to_cpu(di->i_clusters);
417 int ret = -EINVAL;
418
419 if (cluster < total_clusters)
420 mlog(ML_ERROR, "add a group which is in the current volume.\n");
421 else if (input->chain >= cl_count)
422 mlog(ML_ERROR, "input chain exceeds the limit.\n");
423 else if (next_free != cl_count && next_free != input->chain)
424 mlog(ML_ERROR,
425 "the add group should be in chain %u\n", next_free);
426 else if (total_clusters + input->clusters < total_clusters)
427 mlog(ML_ERROR, "add group's clusters overflow.\n");
428 else if (input->clusters > cl_cpg)
429 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
430 else if (input->frees > input->clusters)
431 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
432 else if (total_clusters % cl_cpg != 0)
433 mlog(ML_ERROR,
434 "the last group isn't full. Use group extend first.\n");
435 else if (input->group != ocfs2_which_cluster_group(inode, cluster))
436 mlog(ML_ERROR, "group blkno is invalid\n");
437 else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
438 mlog(ML_ERROR, "group descriptor check failed.\n");
439 else
440 ret = 0;
441
442 return ret;
443 }
444
445 /* Add a new group descriptor to global_bitmap. */
ocfs2_group_add(struct inode * inode,struct ocfs2_new_group_input * input)446 int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
447 {
448 int ret;
449 handle_t *handle;
450 struct buffer_head *main_bm_bh = NULL;
451 struct inode *main_bm_inode = NULL;
452 struct ocfs2_dinode *fe = NULL;
453 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
454 struct buffer_head *group_bh = NULL;
455 struct ocfs2_group_desc *group = NULL;
456 struct ocfs2_chain_list *cl;
457 struct ocfs2_chain_rec *cr;
458 u16 cl_bpc;
459 u64 bg_ptr;
460
461 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
462 return -EROFS;
463
464 main_bm_inode = ocfs2_get_system_file_inode(osb,
465 GLOBAL_BITMAP_SYSTEM_INODE,
466 OCFS2_INVALID_SLOT);
467 if (!main_bm_inode) {
468 ret = -EINVAL;
469 mlog_errno(ret);
470 goto out;
471 }
472
473 inode_lock(main_bm_inode);
474
475 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
476 if (ret < 0) {
477 mlog_errno(ret);
478 goto out_mutex;
479 }
480
481 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
482
483 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
484 ocfs2_group_bitmap_size(osb->sb, 0,
485 osb->s_feature_incompat) * 8) {
486 mlog(ML_ERROR, "The disk is too old and small."
487 " Force to do offline resize.");
488 ret = -EINVAL;
489 goto out_unlock;
490 }
491
492 ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
493 if (ret < 0) {
494 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
495 "from the device.", (unsigned long long)input->group);
496 goto out_unlock;
497 }
498
499 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
500
501 ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
502 if (ret) {
503 mlog_errno(ret);
504 goto out_free_group_bh;
505 }
506
507 trace_ocfs2_group_add((unsigned long long)input->group,
508 input->chain, input->clusters, input->frees);
509
510 handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
511 if (IS_ERR(handle)) {
512 mlog_errno(PTR_ERR(handle));
513 ret = -EINVAL;
514 goto out_free_group_bh;
515 }
516
517 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
518 cl = &fe->id2.i_chain;
519 cr = &cl->cl_recs[input->chain];
520
521 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
522 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
523 if (ret < 0) {
524 mlog_errno(ret);
525 goto out_commit;
526 }
527
528 group = (struct ocfs2_group_desc *)group_bh->b_data;
529 bg_ptr = le64_to_cpu(group->bg_next_group);
530 group->bg_next_group = cr->c_blkno;
531 ocfs2_journal_dirty(handle, group_bh);
532
533 ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
534 main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
535 if (ret < 0) {
536 group->bg_next_group = cpu_to_le64(bg_ptr);
537 mlog_errno(ret);
538 goto out_commit;
539 }
540
541 if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
542 le16_add_cpu(&cl->cl_next_free_rec, 1);
543 memset(cr, 0, sizeof(struct ocfs2_chain_rec));
544 }
545
546 cr->c_blkno = cpu_to_le64(input->group);
547 le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
548 le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
549
550 le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
551 le32_add_cpu(&fe->id1.bitmap1.i_used,
552 (input->clusters - input->frees) * cl_bpc);
553 le32_add_cpu(&fe->i_clusters, input->clusters);
554
555 ocfs2_journal_dirty(handle, main_bm_bh);
556
557 spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
558 OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
559 le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits);
560 spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
561 i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
562
563 ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
564
565 out_commit:
566 ocfs2_commit_trans(osb, handle);
567
568 out_free_group_bh:
569 brelse(group_bh);
570
571 out_unlock:
572 brelse(main_bm_bh);
573
574 ocfs2_inode_unlock(main_bm_inode, 1);
575
576 out_mutex:
577 inode_unlock(main_bm_inode);
578 iput(main_bm_inode);
579
580 out:
581 return ret;
582 }
583