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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * resize.c
6 *
7 * volume resize.
8 * Inspired by ext3/resize.c.
9 *
10 * Copyright (C) 2007 Oracle. All rights reserved.
11 */
12
13#include <linux/fs.h>
14#include <linux/types.h>
15
16#include <cluster/masklog.h>
17
18#include "ocfs2.h"
19
20#include "alloc.h"
21#include "dlmglue.h"
22#include "inode.h"
23#include "journal.h"
24#include "super.h"
25#include "sysfile.h"
26#include "uptodate.h"
27#include "ocfs2_trace.h"
28
29#include "buffer_head_io.h"
30#include "suballoc.h"
31#include "resize.h"
32
33/*
34 * Check whether there are new backup superblocks exist
35 * in the last group. If there are some, mark them or clear
36 * them in the bitmap.
37 *
38 * Return how many backups we find in the last group.
39 */
40static u16 ocfs2_calc_new_backup_super(struct inode *inode,
41 struct ocfs2_group_desc *gd,
42 u16 cl_cpg,
43 u16 old_bg_clusters,
44 int set)
45{
46 int i;
47 u16 backups = 0;
48 u32 cluster, lgd_cluster;
49 u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
50
51 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
52 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
53 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
54
55 gd_blkno = ocfs2_which_cluster_group(inode, cluster);
56 if (gd_blkno < lgd_blkno)
57 continue;
58 else if (gd_blkno > lgd_blkno)
59 break;
60
61 /* check if already done backup super */
62 lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno);
63 lgd_cluster += old_bg_clusters;
64 if (lgd_cluster >= cluster)
65 continue;
66
67 if (set)
68 ocfs2_set_bit(cluster % cl_cpg,
69 (unsigned long *)gd->bg_bitmap);
70 else
71 ocfs2_clear_bit(cluster % cl_cpg,
72 (unsigned long *)gd->bg_bitmap);
73 backups++;
74 }
75
76 return backups;
77}
78
79static int ocfs2_update_last_group_and_inode(handle_t *handle,
80 struct inode *bm_inode,
81 struct buffer_head *bm_bh,
82 struct buffer_head *group_bh,
83 u32 first_new_cluster,
84 int new_clusters)
85{
86 int ret = 0;
87 struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
88 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
89 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
90 struct ocfs2_chain_rec *cr;
91 struct ocfs2_group_desc *group;
92 u16 chain, num_bits, backups = 0;
93 u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
94 u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
95 u16 old_bg_clusters;
96
97 trace_ocfs2_update_last_group_and_inode(new_clusters,
98 first_new_cluster);
99
100 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
101 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
102 if (ret < 0) {
103 mlog_errno(ret);
104 goto out;
105 }
106
107 group = (struct ocfs2_group_desc *)group_bh->b_data;
108
109 old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc;
110 /* update the group first. */
111 num_bits = new_clusters * cl_bpc;
112 le16_add_cpu(&group->bg_bits, num_bits);
113 le16_add_cpu(&group->bg_free_bits_count, num_bits);
114
115 /*
116 * check whether there are some new backup superblocks exist in
117 * this group and update the group bitmap accordingly.
118 */
119 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
120 OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
121 backups = ocfs2_calc_new_backup_super(bm_inode,
122 group,
123 cl_cpg, old_bg_clusters, 1);
124 le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
125 }
126
127 ocfs2_journal_dirty(handle, group_bh);
128
129 /* update the inode accordingly. */
130 ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
131 OCFS2_JOURNAL_ACCESS_WRITE);
132 if (ret < 0) {
133 mlog_errno(ret);
134 goto out_rollback;
135 }
136
137 chain = le16_to_cpu(group->bg_chain);
138 cr = (&cl->cl_recs[chain]);
139 le32_add_cpu(&cr->c_total, num_bits);
140 le32_add_cpu(&cr->c_free, num_bits);
141 le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
142 le32_add_cpu(&fe->i_clusters, new_clusters);
143
144 if (backups) {
145 le32_add_cpu(&cr->c_free, -1 * backups);
146 le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
147 }
148
149 spin_lock(&OCFS2_I(bm_inode)->ip_lock);
150 OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
151 le64_add_cpu(&fe->i_size, (u64)new_clusters << osb->s_clustersize_bits);
152 spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
153 i_size_write(bm_inode, le64_to_cpu(fe->i_size));
154
155 ocfs2_journal_dirty(handle, bm_bh);
156
157out_rollback:
158 if (ret < 0) {
159 ocfs2_calc_new_backup_super(bm_inode,
160 group,
161 cl_cpg, old_bg_clusters, 0);
162 le16_add_cpu(&group->bg_free_bits_count, backups);
163 le16_add_cpu(&group->bg_bits, -1 * num_bits);
164 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
165 }
166out:
167 if (ret)
168 mlog_errno(ret);
169 return ret;
170}
171
172static int update_backups(struct inode * inode, u32 clusters, char *data)
173{
174 int i, ret = 0;
175 u32 cluster;
176 u64 blkno;
177 struct buffer_head *backup = NULL;
178 struct ocfs2_dinode *backup_di = NULL;
179 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
180
181 /* calculate the real backups we need to update. */
182 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
183 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
184 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
185 if (cluster >= clusters)
186 break;
187
188 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
189 if (ret < 0) {
190 mlog_errno(ret);
191 break;
192 }
193
194 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
195
196 backup_di = (struct ocfs2_dinode *)backup->b_data;
197 backup_di->i_blkno = cpu_to_le64(blkno);
198
199 ret = ocfs2_write_super_or_backup(osb, backup);
200 brelse(backup);
201 backup = NULL;
202 if (ret < 0) {
203 mlog_errno(ret);
204 break;
205 }
206 }
207
208 return ret;
209}
210
211static void ocfs2_update_super_and_backups(struct inode *inode,
212 int new_clusters)
213{
214 int ret;
215 u32 clusters = 0;
216 struct buffer_head *super_bh = NULL;
217 struct ocfs2_dinode *super_di = NULL;
218 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
219
220 /*
221 * update the superblock last.
222 * It doesn't matter if the write failed.
223 */
224 ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
225 &super_bh);
226 if (ret < 0) {
227 mlog_errno(ret);
228 goto out;
229 }
230
231 super_di = (struct ocfs2_dinode *)super_bh->b_data;
232 le32_add_cpu(&super_di->i_clusters, new_clusters);
233 clusters = le32_to_cpu(super_di->i_clusters);
234
235 ret = ocfs2_write_super_or_backup(osb, super_bh);
236 if (ret < 0) {
237 mlog_errno(ret);
238 goto out;
239 }
240
241 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
242 ret = update_backups(inode, clusters, super_bh->b_data);
243
244out:
245 brelse(super_bh);
246 if (ret)
247 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
248 " during fs resize. This condition is not fatal,"
249 " but fsck.ocfs2 should be run to fix it\n",
250 osb->dev_str);
251 return;
252}
253
254/*
255 * Extend the filesystem to the new number of clusters specified. This entry
256 * point is only used to extend the current filesystem to the end of the last
257 * existing group.
258 */
259int ocfs2_group_extend(struct inode * inode, int new_clusters)
260{
261 int ret;
262 handle_t *handle;
263 struct buffer_head *main_bm_bh = NULL;
264 struct buffer_head *group_bh = NULL;
265 struct inode *main_bm_inode = NULL;
266 struct ocfs2_dinode *fe = NULL;
267 struct ocfs2_group_desc *group = NULL;
268 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
269 u16 cl_bpc;
270 u32 first_new_cluster;
271 u64 lgd_blkno;
272
273 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
274 return -EROFS;
275
276 if (new_clusters < 0)
277 return -EINVAL;
278 else if (new_clusters == 0)
279 return 0;
280
281 main_bm_inode = ocfs2_get_system_file_inode(osb,
282 GLOBAL_BITMAP_SYSTEM_INODE,
283 OCFS2_INVALID_SLOT);
284 if (!main_bm_inode) {
285 ret = -EINVAL;
286 mlog_errno(ret);
287 goto out;
288 }
289
290 inode_lock(main_bm_inode);
291
292 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
293 if (ret < 0) {
294 mlog_errno(ret);
295 goto out_mutex;
296 }
297
298 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
299
300 /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
301 * so any corruption is a code bug. */
302 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
303
304 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
305 ocfs2_group_bitmap_size(osb->sb, 0,
306 osb->s_feature_incompat) * 8) {
307 mlog(ML_ERROR, "The disk is too old and small. "
308 "Force to do offline resize.");
309 ret = -EINVAL;
310 goto out_unlock;
311 }
312
313 first_new_cluster = le32_to_cpu(fe->i_clusters);
314 lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
315 first_new_cluster - 1);
316
317 ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
318 &group_bh);
319 if (ret < 0) {
320 mlog_errno(ret);
321 goto out_unlock;
322 }
323 group = (struct ocfs2_group_desc *)group_bh->b_data;
324
325 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
326 if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
327 le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
328 ret = -EINVAL;
329 goto out_unlock;
330 }
331
332
333 trace_ocfs2_group_extend(
334 (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
335
336 handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
337 if (IS_ERR(handle)) {
338 mlog_errno(PTR_ERR(handle));
339 ret = -EINVAL;
340 goto out_unlock;
341 }
342
343 /* update the last group descriptor and inode. */
344 ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
345 main_bm_bh, group_bh,
346 first_new_cluster,
347 new_clusters);
348 if (ret) {
349 mlog_errno(ret);
350 goto out_commit;
351 }
352
353 ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
354
355out_commit:
356 ocfs2_commit_trans(osb, handle);
357out_unlock:
358 brelse(group_bh);
359 brelse(main_bm_bh);
360
361 ocfs2_inode_unlock(main_bm_inode, 1);
362
363out_mutex:
364 inode_unlock(main_bm_inode);
365 iput(main_bm_inode);
366
367out:
368 return ret;
369}
370
371static int ocfs2_check_new_group(struct inode *inode,
372 struct ocfs2_dinode *di,
373 struct ocfs2_new_group_input *input,
374 struct buffer_head *group_bh)
375{
376 int ret;
377 struct ocfs2_group_desc *gd =
378 (struct ocfs2_group_desc *)group_bh->b_data;
379 u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
380
381 ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
382 if (ret)
383 goto out;
384
385 ret = -EINVAL;
386 if (le16_to_cpu(gd->bg_chain) != input->chain)
387 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
388 "while input has %u set.\n",
389 (unsigned long long)le64_to_cpu(gd->bg_blkno),
390 le16_to_cpu(gd->bg_chain), input->chain);
391 else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
392 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
393 "input has %u clusters set\n",
394 (unsigned long long)le64_to_cpu(gd->bg_blkno),
395 le16_to_cpu(gd->bg_bits), input->clusters);
396 else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
397 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
398 "but it should have %u set\n",
399 (unsigned long long)le64_to_cpu(gd->bg_blkno),
400 le16_to_cpu(gd->bg_bits),
401 input->frees * cl_bpc);
402 else
403 ret = 0;
404
405out:
406 return ret;
407}
408
409static int ocfs2_verify_group_and_input(struct inode *inode,
410 struct ocfs2_dinode *di,
411 struct ocfs2_new_group_input *input,
412 struct buffer_head *group_bh)
413{
414 u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
415 u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
416 u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
417 u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
418 u32 total_clusters = le32_to_cpu(di->i_clusters);
419 int ret = -EINVAL;
420
421 if (cluster < total_clusters)
422 mlog(ML_ERROR, "add a group which is in the current volume.\n");
423 else if (input->chain >= cl_count)
424 mlog(ML_ERROR, "input chain exceeds the limit.\n");
425 else if (next_free != cl_count && next_free != input->chain)
426 mlog(ML_ERROR,
427 "the add group should be in chain %u\n", next_free);
428 else if (total_clusters + input->clusters < total_clusters)
429 mlog(ML_ERROR, "add group's clusters overflow.\n");
430 else if (input->clusters > cl_cpg)
431 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
432 else if (input->frees > input->clusters)
433 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
434 else if (total_clusters % cl_cpg != 0)
435 mlog(ML_ERROR,
436 "the last group isn't full. Use group extend first.\n");
437 else if (input->group != ocfs2_which_cluster_group(inode, cluster))
438 mlog(ML_ERROR, "group blkno is invalid\n");
439 else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
440 mlog(ML_ERROR, "group descriptor check failed.\n");
441 else
442 ret = 0;
443
444 return ret;
445}
446
447/* Add a new group descriptor to global_bitmap. */
448int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
449{
450 int ret;
451 handle_t *handle;
452 struct buffer_head *main_bm_bh = NULL;
453 struct inode *main_bm_inode = NULL;
454 struct ocfs2_dinode *fe = NULL;
455 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
456 struct buffer_head *group_bh = NULL;
457 struct ocfs2_group_desc *group = NULL;
458 struct ocfs2_chain_list *cl;
459 struct ocfs2_chain_rec *cr;
460 u16 cl_bpc;
461 u64 bg_ptr;
462
463 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
464 return -EROFS;
465
466 main_bm_inode = ocfs2_get_system_file_inode(osb,
467 GLOBAL_BITMAP_SYSTEM_INODE,
468 OCFS2_INVALID_SLOT);
469 if (!main_bm_inode) {
470 ret = -EINVAL;
471 mlog_errno(ret);
472 goto out;
473 }
474
475 inode_lock(main_bm_inode);
476
477 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
478 if (ret < 0) {
479 mlog_errno(ret);
480 goto out_mutex;
481 }
482
483 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
484
485 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
486 ocfs2_group_bitmap_size(osb->sb, 0,
487 osb->s_feature_incompat) * 8) {
488 mlog(ML_ERROR, "The disk is too old and small."
489 " Force to do offline resize.");
490 ret = -EINVAL;
491 goto out_unlock;
492 }
493
494 ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
495 if (ret < 0) {
496 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
497 "from the device.", (unsigned long long)input->group);
498 goto out_unlock;
499 }
500
501 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
502
503 ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
504 if (ret) {
505 mlog_errno(ret);
506 goto out_free_group_bh;
507 }
508
509 trace_ocfs2_group_add((unsigned long long)input->group,
510 input->chain, input->clusters, input->frees);
511
512 handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
513 if (IS_ERR(handle)) {
514 mlog_errno(PTR_ERR(handle));
515 ret = -EINVAL;
516 goto out_free_group_bh;
517 }
518
519 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
520 cl = &fe->id2.i_chain;
521 cr = &cl->cl_recs[input->chain];
522
523 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
524 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
525 if (ret < 0) {
526 mlog_errno(ret);
527 goto out_commit;
528 }
529
530 group = (struct ocfs2_group_desc *)group_bh->b_data;
531 bg_ptr = le64_to_cpu(group->bg_next_group);
532 group->bg_next_group = cr->c_blkno;
533 ocfs2_journal_dirty(handle, group_bh);
534
535 ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
536 main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
537 if (ret < 0) {
538 group->bg_next_group = cpu_to_le64(bg_ptr);
539 mlog_errno(ret);
540 goto out_commit;
541 }
542
543 if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
544 le16_add_cpu(&cl->cl_next_free_rec, 1);
545 memset(cr, 0, sizeof(struct ocfs2_chain_rec));
546 }
547
548 cr->c_blkno = cpu_to_le64(input->group);
549 le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
550 le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
551
552 le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
553 le32_add_cpu(&fe->id1.bitmap1.i_used,
554 (input->clusters - input->frees) * cl_bpc);
555 le32_add_cpu(&fe->i_clusters, input->clusters);
556
557 ocfs2_journal_dirty(handle, main_bm_bh);
558
559 spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
560 OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
561 le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits);
562 spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
563 i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
564
565 ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
566
567out_commit:
568 ocfs2_commit_trans(osb, handle);
569
570out_free_group_bh:
571 brelse(group_bh);
572
573out_unlock:
574 brelse(main_bm_bh);
575
576 ocfs2_inode_unlock(main_bm_inode, 1);
577
578out_mutex:
579 inode_unlock(main_bm_inode);
580 iput(main_bm_inode);
581
582out:
583 return ret;
584}
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 */
38static 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
77static 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
155out_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 }
164out:
165 if (ret)
166 mlog_errno(ret);
167 return ret;
168}
169
170static 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
209static 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
242out:
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 */
257int 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
353out_commit:
354 ocfs2_commit_trans(osb, handle);
355out_unlock:
356 brelse(group_bh);
357 brelse(main_bm_bh);
358
359 ocfs2_inode_unlock(main_bm_inode, 1);
360
361out_mutex:
362 inode_unlock(main_bm_inode);
363 iput(main_bm_inode);
364
365out:
366 return ret;
367}
368
369static 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
403out:
404 return ret;
405}
406
407static 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. */
446int 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
565out_commit:
566 ocfs2_commit_trans(osb, handle);
567
568out_free_group_bh:
569 brelse(group_bh);
570
571out_unlock:
572 brelse(main_bm_bh);
573
574 ocfs2_inode_unlock(main_bm_inode, 1);
575
576out_mutex:
577 inode_unlock(main_bm_inode);
578 iput(main_bm_inode);
579
580out:
581 return ret;
582}