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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 */
54static u16 ocfs2_calc_new_backup_super(struct inode *inode,
55 struct ocfs2_group_desc *gd,
56 u16 cl_cpg,
57 u16 old_bg_clusters,
58 int set)
59{
60 int i;
61 u16 backups = 0;
62 u32 cluster, lgd_cluster;
63 u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
64
65 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
66 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
67 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
68
69 gd_blkno = ocfs2_which_cluster_group(inode, cluster);
70 if (gd_blkno < lgd_blkno)
71 continue;
72 else if (gd_blkno > lgd_blkno)
73 break;
74
75 /* check if already done backup super */
76 lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno);
77 lgd_cluster += old_bg_clusters;
78 if (lgd_cluster >= cluster)
79 continue;
80
81 if (set)
82 ocfs2_set_bit(cluster % cl_cpg,
83 (unsigned long *)gd->bg_bitmap);
84 else
85 ocfs2_clear_bit(cluster % cl_cpg,
86 (unsigned long *)gd->bg_bitmap);
87 backups++;
88 }
89
90 return backups;
91}
92
93static int ocfs2_update_last_group_and_inode(handle_t *handle,
94 struct inode *bm_inode,
95 struct buffer_head *bm_bh,
96 struct buffer_head *group_bh,
97 u32 first_new_cluster,
98 int new_clusters)
99{
100 int ret = 0;
101 struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
102 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
103 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
104 struct ocfs2_chain_rec *cr;
105 struct ocfs2_group_desc *group;
106 u16 chain, num_bits, backups = 0;
107 u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
108 u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
109 u16 old_bg_clusters;
110
111 trace_ocfs2_update_last_group_and_inode(new_clusters,
112 first_new_cluster);
113
114 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
115 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
116 if (ret < 0) {
117 mlog_errno(ret);
118 goto out;
119 }
120
121 group = (struct ocfs2_group_desc *)group_bh->b_data;
122
123 old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc;
124 /* update the group first. */
125 num_bits = new_clusters * cl_bpc;
126 le16_add_cpu(&group->bg_bits, num_bits);
127 le16_add_cpu(&group->bg_free_bits_count, num_bits);
128
129 /*
130 * check whether there are some new backup superblocks exist in
131 * this group and update the group bitmap accordingly.
132 */
133 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
134 OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
135 backups = ocfs2_calc_new_backup_super(bm_inode,
136 group,
137 cl_cpg, old_bg_clusters, 1);
138 le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
139 }
140
141 ocfs2_journal_dirty(handle, group_bh);
142
143 /* update the inode accordingly. */
144 ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
145 OCFS2_JOURNAL_ACCESS_WRITE);
146 if (ret < 0) {
147 mlog_errno(ret);
148 goto out_rollback;
149 }
150
151 chain = le16_to_cpu(group->bg_chain);
152 cr = (&cl->cl_recs[chain]);
153 le32_add_cpu(&cr->c_total, num_bits);
154 le32_add_cpu(&cr->c_free, num_bits);
155 le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
156 le32_add_cpu(&fe->i_clusters, new_clusters);
157
158 if (backups) {
159 le32_add_cpu(&cr->c_free, -1 * backups);
160 le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
161 }
162
163 spin_lock(&OCFS2_I(bm_inode)->ip_lock);
164 OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
165 le64_add_cpu(&fe->i_size, (u64)new_clusters << osb->s_clustersize_bits);
166 spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
167 i_size_write(bm_inode, le64_to_cpu(fe->i_size));
168
169 ocfs2_journal_dirty(handle, bm_bh);
170
171out_rollback:
172 if (ret < 0) {
173 ocfs2_calc_new_backup_super(bm_inode,
174 group,
175 cl_cpg, old_bg_clusters, 0);
176 le16_add_cpu(&group->bg_free_bits_count, backups);
177 le16_add_cpu(&group->bg_bits, -1 * num_bits);
178 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
179 }
180out:
181 if (ret)
182 mlog_errno(ret);
183 return ret;
184}
185
186static int update_backups(struct inode * inode, u32 clusters, char *data)
187{
188 int i, ret = 0;
189 u32 cluster;
190 u64 blkno;
191 struct buffer_head *backup = NULL;
192 struct ocfs2_dinode *backup_di = NULL;
193 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
194
195 /* calculate the real backups we need to update. */
196 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
197 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
198 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
199 if (cluster >= clusters)
200 break;
201
202 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
203 if (ret < 0) {
204 mlog_errno(ret);
205 break;
206 }
207
208 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
209
210 backup_di = (struct ocfs2_dinode *)backup->b_data;
211 backup_di->i_blkno = cpu_to_le64(blkno);
212
213 ret = ocfs2_write_super_or_backup(osb, backup);
214 brelse(backup);
215 backup = NULL;
216 if (ret < 0) {
217 mlog_errno(ret);
218 break;
219 }
220 }
221
222 return ret;
223}
224
225static void ocfs2_update_super_and_backups(struct inode *inode,
226 int new_clusters)
227{
228 int ret;
229 u32 clusters = 0;
230 struct buffer_head *super_bh = NULL;
231 struct ocfs2_dinode *super_di = NULL;
232 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
233
234 /*
235 * update the superblock last.
236 * It doesn't matter if the write failed.
237 */
238 ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
239 &super_bh);
240 if (ret < 0) {
241 mlog_errno(ret);
242 goto out;
243 }
244
245 super_di = (struct ocfs2_dinode *)super_bh->b_data;
246 le32_add_cpu(&super_di->i_clusters, new_clusters);
247 clusters = le32_to_cpu(super_di->i_clusters);
248
249 ret = ocfs2_write_super_or_backup(osb, super_bh);
250 if (ret < 0) {
251 mlog_errno(ret);
252 goto out;
253 }
254
255 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
256 ret = update_backups(inode, clusters, super_bh->b_data);
257
258out:
259 brelse(super_bh);
260 if (ret)
261 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
262 " during fs resize. This condition is not fatal,"
263 " but fsck.ocfs2 should be run to fix it\n",
264 osb->dev_str);
265 return;
266}
267
268/*
269 * Extend the filesystem to the new number of clusters specified. This entry
270 * point is only used to extend the current filesystem to the end of the last
271 * existing group.
272 */
273int ocfs2_group_extend(struct inode * inode, int new_clusters)
274{
275 int ret;
276 handle_t *handle;
277 struct buffer_head *main_bm_bh = NULL;
278 struct buffer_head *group_bh = NULL;
279 struct inode *main_bm_inode = NULL;
280 struct ocfs2_dinode *fe = NULL;
281 struct ocfs2_group_desc *group = NULL;
282 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
283 u16 cl_bpc;
284 u32 first_new_cluster;
285 u64 lgd_blkno;
286
287 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
288 return -EROFS;
289
290 if (new_clusters < 0)
291 return -EINVAL;
292 else if (new_clusters == 0)
293 return 0;
294
295 main_bm_inode = ocfs2_get_system_file_inode(osb,
296 GLOBAL_BITMAP_SYSTEM_INODE,
297 OCFS2_INVALID_SLOT);
298 if (!main_bm_inode) {
299 ret = -EINVAL;
300 mlog_errno(ret);
301 goto out;
302 }
303
304 inode_lock(main_bm_inode);
305
306 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
307 if (ret < 0) {
308 mlog_errno(ret);
309 goto out_mutex;
310 }
311
312 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
313
314 /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
315 * so any corruption is a code bug. */
316 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
317
318 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
319 ocfs2_group_bitmap_size(osb->sb, 0,
320 osb->s_feature_incompat) * 8) {
321 mlog(ML_ERROR, "The disk is too old and small. "
322 "Force to do offline resize.");
323 ret = -EINVAL;
324 goto out_unlock;
325 }
326
327 first_new_cluster = le32_to_cpu(fe->i_clusters);
328 lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
329 first_new_cluster - 1);
330
331 ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
332 &group_bh);
333 if (ret < 0) {
334 mlog_errno(ret);
335 goto out_unlock;
336 }
337 group = (struct ocfs2_group_desc *)group_bh->b_data;
338
339 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
340 if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
341 le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
342 ret = -EINVAL;
343 goto out_unlock;
344 }
345
346
347 trace_ocfs2_group_extend(
348 (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
349
350 handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
351 if (IS_ERR(handle)) {
352 mlog_errno(PTR_ERR(handle));
353 ret = -EINVAL;
354 goto out_unlock;
355 }
356
357 /* update the last group descriptor and inode. */
358 ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
359 main_bm_bh, group_bh,
360 first_new_cluster,
361 new_clusters);
362 if (ret) {
363 mlog_errno(ret);
364 goto out_commit;
365 }
366
367 ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
368
369out_commit:
370 ocfs2_commit_trans(osb, handle);
371out_unlock:
372 brelse(group_bh);
373 brelse(main_bm_bh);
374
375 ocfs2_inode_unlock(main_bm_inode, 1);
376
377out_mutex:
378 inode_unlock(main_bm_inode);
379 iput(main_bm_inode);
380
381out:
382 return ret;
383}
384
385static int ocfs2_check_new_group(struct inode *inode,
386 struct ocfs2_dinode *di,
387 struct ocfs2_new_group_input *input,
388 struct buffer_head *group_bh)
389{
390 int ret;
391 struct ocfs2_group_desc *gd =
392 (struct ocfs2_group_desc *)group_bh->b_data;
393 u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
394
395 ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
396 if (ret)
397 goto out;
398
399 ret = -EINVAL;
400 if (le16_to_cpu(gd->bg_chain) != input->chain)
401 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
402 "while input has %u set.\n",
403 (unsigned long long)le64_to_cpu(gd->bg_blkno),
404 le16_to_cpu(gd->bg_chain), input->chain);
405 else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
406 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
407 "input has %u clusters set\n",
408 (unsigned long long)le64_to_cpu(gd->bg_blkno),
409 le16_to_cpu(gd->bg_bits), input->clusters);
410 else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
411 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
412 "but it should have %u set\n",
413 (unsigned long long)le64_to_cpu(gd->bg_blkno),
414 le16_to_cpu(gd->bg_bits),
415 input->frees * cl_bpc);
416 else
417 ret = 0;
418
419out:
420 return ret;
421}
422
423static int ocfs2_verify_group_and_input(struct inode *inode,
424 struct ocfs2_dinode *di,
425 struct ocfs2_new_group_input *input,
426 struct buffer_head *group_bh)
427{
428 u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
429 u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
430 u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
431 u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
432 u32 total_clusters = le32_to_cpu(di->i_clusters);
433 int ret = -EINVAL;
434
435 if (cluster < total_clusters)
436 mlog(ML_ERROR, "add a group which is in the current volume.\n");
437 else if (input->chain >= cl_count)
438 mlog(ML_ERROR, "input chain exceeds the limit.\n");
439 else if (next_free != cl_count && next_free != input->chain)
440 mlog(ML_ERROR,
441 "the add group should be in chain %u\n", next_free);
442 else if (total_clusters + input->clusters < total_clusters)
443 mlog(ML_ERROR, "add group's clusters overflow.\n");
444 else if (input->clusters > cl_cpg)
445 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
446 else if (input->frees > input->clusters)
447 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
448 else if (total_clusters % cl_cpg != 0)
449 mlog(ML_ERROR,
450 "the last group isn't full. Use group extend first.\n");
451 else if (input->group != ocfs2_which_cluster_group(inode, cluster))
452 mlog(ML_ERROR, "group blkno is invalid\n");
453 else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
454 mlog(ML_ERROR, "group descriptor check failed.\n");
455 else
456 ret = 0;
457
458 return ret;
459}
460
461/* Add a new group descriptor to global_bitmap. */
462int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
463{
464 int ret;
465 handle_t *handle;
466 struct buffer_head *main_bm_bh = NULL;
467 struct inode *main_bm_inode = NULL;
468 struct ocfs2_dinode *fe = NULL;
469 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
470 struct buffer_head *group_bh = NULL;
471 struct ocfs2_group_desc *group = NULL;
472 struct ocfs2_chain_list *cl;
473 struct ocfs2_chain_rec *cr;
474 u16 cl_bpc;
475 u64 bg_ptr;
476
477 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
478 return -EROFS;
479
480 main_bm_inode = ocfs2_get_system_file_inode(osb,
481 GLOBAL_BITMAP_SYSTEM_INODE,
482 OCFS2_INVALID_SLOT);
483 if (!main_bm_inode) {
484 ret = -EINVAL;
485 mlog_errno(ret);
486 goto out;
487 }
488
489 inode_lock(main_bm_inode);
490
491 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
492 if (ret < 0) {
493 mlog_errno(ret);
494 goto out_mutex;
495 }
496
497 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
498
499 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
500 ocfs2_group_bitmap_size(osb->sb, 0,
501 osb->s_feature_incompat) * 8) {
502 mlog(ML_ERROR, "The disk is too old and small."
503 " Force to do offline resize.");
504 ret = -EINVAL;
505 goto out_unlock;
506 }
507
508 ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
509 if (ret < 0) {
510 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
511 "from the device.", (unsigned long long)input->group);
512 goto out_unlock;
513 }
514
515 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
516
517 ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
518 if (ret) {
519 mlog_errno(ret);
520 goto out_free_group_bh;
521 }
522
523 trace_ocfs2_group_add((unsigned long long)input->group,
524 input->chain, input->clusters, input->frees);
525
526 handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
527 if (IS_ERR(handle)) {
528 mlog_errno(PTR_ERR(handle));
529 ret = -EINVAL;
530 goto out_free_group_bh;
531 }
532
533 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
534 cl = &fe->id2.i_chain;
535 cr = &cl->cl_recs[input->chain];
536
537 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
538 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
539 if (ret < 0) {
540 mlog_errno(ret);
541 goto out_commit;
542 }
543
544 group = (struct ocfs2_group_desc *)group_bh->b_data;
545 bg_ptr = le64_to_cpu(group->bg_next_group);
546 group->bg_next_group = cr->c_blkno;
547 ocfs2_journal_dirty(handle, group_bh);
548
549 ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
550 main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
551 if (ret < 0) {
552 group->bg_next_group = cpu_to_le64(bg_ptr);
553 mlog_errno(ret);
554 goto out_commit;
555 }
556
557 if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
558 le16_add_cpu(&cl->cl_next_free_rec, 1);
559 memset(cr, 0, sizeof(struct ocfs2_chain_rec));
560 }
561
562 cr->c_blkno = cpu_to_le64(input->group);
563 le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
564 le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
565
566 le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
567 le32_add_cpu(&fe->id1.bitmap1.i_used,
568 (input->clusters - input->frees) * cl_bpc);
569 le32_add_cpu(&fe->i_clusters, input->clusters);
570
571 ocfs2_journal_dirty(handle, main_bm_bh);
572
573 spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
574 OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
575 le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits);
576 spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
577 i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
578
579 ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
580
581out_commit:
582 ocfs2_commit_trans(osb, handle);
583
584out_free_group_bh:
585 brelse(group_bh);
586
587out_unlock:
588 brelse(main_bm_bh);
589
590 ocfs2_inode_unlock(main_bm_inode, 1);
591
592out_mutex:
593 inode_unlock(main_bm_inode);
594 iput(main_bm_inode);
595
596out:
597 return ret;
598}
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 u16 contig_bits;
95 __le16 old_bg_contig_free_bits;
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 contig_bits = ocfs2_find_max_contig_free_bits(group->bg_bitmap,
128 le16_to_cpu(group->bg_bits), 0);
129 old_bg_contig_free_bits = group->bg_contig_free_bits;
130 group->bg_contig_free_bits = cpu_to_le16(contig_bits);
131
132 ocfs2_journal_dirty(handle, group_bh);
133
134 /* update the inode accordingly. */
135 ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
136 OCFS2_JOURNAL_ACCESS_WRITE);
137 if (ret < 0) {
138 mlog_errno(ret);
139 goto out_rollback;
140 }
141
142 chain = le16_to_cpu(group->bg_chain);
143 cr = (&cl->cl_recs[chain]);
144 le32_add_cpu(&cr->c_total, num_bits);
145 le32_add_cpu(&cr->c_free, num_bits);
146 le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
147 le32_add_cpu(&fe->i_clusters, new_clusters);
148
149 if (backups) {
150 le32_add_cpu(&cr->c_free, -1 * backups);
151 le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
152 }
153
154 spin_lock(&OCFS2_I(bm_inode)->ip_lock);
155 OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
156 le64_add_cpu(&fe->i_size, (u64)new_clusters << osb->s_clustersize_bits);
157 spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
158 i_size_write(bm_inode, le64_to_cpu(fe->i_size));
159
160 ocfs2_journal_dirty(handle, bm_bh);
161
162out_rollback:
163 if (ret < 0) {
164 ocfs2_calc_new_backup_super(bm_inode,
165 group,
166 cl_cpg, old_bg_clusters, 0);
167 le16_add_cpu(&group->bg_free_bits_count, backups);
168 le16_add_cpu(&group->bg_bits, -1 * num_bits);
169 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
170 group->bg_contig_free_bits = old_bg_contig_free_bits;
171 }
172out:
173 if (ret)
174 mlog_errno(ret);
175 return ret;
176}
177
178static int update_backups(struct inode * inode, u32 clusters, char *data)
179{
180 int i, ret = 0;
181 u32 cluster;
182 u64 blkno;
183 struct buffer_head *backup = NULL;
184 struct ocfs2_dinode *backup_di = NULL;
185 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
186
187 /* calculate the real backups we need to update. */
188 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
189 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
190 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
191 if (cluster >= clusters)
192 break;
193
194 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
195 if (ret < 0) {
196 mlog_errno(ret);
197 break;
198 }
199
200 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
201
202 backup_di = (struct ocfs2_dinode *)backup->b_data;
203 backup_di->i_blkno = cpu_to_le64(blkno);
204
205 ret = ocfs2_write_super_or_backup(osb, backup);
206 brelse(backup);
207 backup = NULL;
208 if (ret < 0) {
209 mlog_errno(ret);
210 break;
211 }
212 }
213
214 return ret;
215}
216
217static void ocfs2_update_super_and_backups(struct inode *inode,
218 int new_clusters)
219{
220 int ret;
221 u32 clusters = 0;
222 struct buffer_head *super_bh = NULL;
223 struct ocfs2_dinode *super_di = NULL;
224 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
225
226 /*
227 * update the superblock last.
228 * It doesn't matter if the write failed.
229 */
230 ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
231 &super_bh);
232 if (ret < 0) {
233 mlog_errno(ret);
234 goto out;
235 }
236
237 super_di = (struct ocfs2_dinode *)super_bh->b_data;
238 le32_add_cpu(&super_di->i_clusters, new_clusters);
239 clusters = le32_to_cpu(super_di->i_clusters);
240
241 ret = ocfs2_write_super_or_backup(osb, super_bh);
242 if (ret < 0) {
243 mlog_errno(ret);
244 goto out;
245 }
246
247 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
248 ret = update_backups(inode, clusters, super_bh->b_data);
249
250out:
251 brelse(super_bh);
252 if (ret)
253 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
254 " during fs resize. This condition is not fatal,"
255 " but fsck.ocfs2 should be run to fix it\n",
256 osb->dev_str);
257 return;
258}
259
260/*
261 * Extend the filesystem to the new number of clusters specified. This entry
262 * point is only used to extend the current filesystem to the end of the last
263 * existing group.
264 */
265int ocfs2_group_extend(struct inode * inode, int new_clusters)
266{
267 int ret;
268 handle_t *handle;
269 struct buffer_head *main_bm_bh = NULL;
270 struct buffer_head *group_bh = NULL;
271 struct inode *main_bm_inode = NULL;
272 struct ocfs2_dinode *fe = NULL;
273 struct ocfs2_group_desc *group = NULL;
274 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
275 u16 cl_bpc;
276 u32 first_new_cluster;
277 u64 lgd_blkno;
278
279 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
280 return -EROFS;
281
282 if (new_clusters < 0)
283 return -EINVAL;
284 else if (new_clusters == 0)
285 return 0;
286
287 main_bm_inode = ocfs2_get_system_file_inode(osb,
288 GLOBAL_BITMAP_SYSTEM_INODE,
289 OCFS2_INVALID_SLOT);
290 if (!main_bm_inode) {
291 ret = -EINVAL;
292 mlog_errno(ret);
293 goto out;
294 }
295
296 inode_lock(main_bm_inode);
297
298 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
299 if (ret < 0) {
300 mlog_errno(ret);
301 goto out_mutex;
302 }
303
304 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
305
306 /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
307 * so any corruption is a code bug. */
308 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
309
310 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
311 ocfs2_group_bitmap_size(osb->sb, 0,
312 osb->s_feature_incompat) * 8) {
313 mlog(ML_ERROR, "The disk is too old and small. "
314 "Force to do offline resize.");
315 ret = -EINVAL;
316 goto out_unlock;
317 }
318
319 first_new_cluster = le32_to_cpu(fe->i_clusters);
320 lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
321 first_new_cluster - 1);
322
323 ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
324 &group_bh);
325 if (ret < 0) {
326 mlog_errno(ret);
327 goto out_unlock;
328 }
329 group = (struct ocfs2_group_desc *)group_bh->b_data;
330
331 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
332 if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
333 le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
334 ret = -EINVAL;
335 goto out_unlock;
336 }
337
338
339 trace_ocfs2_group_extend(
340 (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
341
342 handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
343 if (IS_ERR(handle)) {
344 mlog_errno(PTR_ERR(handle));
345 ret = -EINVAL;
346 goto out_unlock;
347 }
348
349 /* update the last group descriptor and inode. */
350 ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
351 main_bm_bh, group_bh,
352 first_new_cluster,
353 new_clusters);
354 if (ret) {
355 mlog_errno(ret);
356 goto out_commit;
357 }
358
359 ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
360
361out_commit:
362 ocfs2_commit_trans(osb, handle);
363out_unlock:
364 brelse(group_bh);
365 brelse(main_bm_bh);
366
367 ocfs2_inode_unlock(main_bm_inode, 1);
368
369out_mutex:
370 inode_unlock(main_bm_inode);
371 iput(main_bm_inode);
372
373out:
374 return ret;
375}
376
377static int ocfs2_check_new_group(struct inode *inode,
378 struct ocfs2_dinode *di,
379 struct ocfs2_new_group_input *input,
380 struct buffer_head *group_bh)
381{
382 int ret;
383 struct ocfs2_group_desc *gd =
384 (struct ocfs2_group_desc *)group_bh->b_data;
385 u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
386
387 ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
388 if (ret)
389 goto out;
390
391 ret = -EINVAL;
392 if (le16_to_cpu(gd->bg_chain) != input->chain)
393 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
394 "while input has %u set.\n",
395 (unsigned long long)le64_to_cpu(gd->bg_blkno),
396 le16_to_cpu(gd->bg_chain), input->chain);
397 else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
398 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
399 "input has %u clusters set\n",
400 (unsigned long long)le64_to_cpu(gd->bg_blkno),
401 le16_to_cpu(gd->bg_bits), input->clusters);
402 else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
403 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
404 "but it should have %u set\n",
405 (unsigned long long)le64_to_cpu(gd->bg_blkno),
406 le16_to_cpu(gd->bg_bits),
407 input->frees * cl_bpc);
408 else
409 ret = 0;
410
411out:
412 return ret;
413}
414
415static int ocfs2_verify_group_and_input(struct inode *inode,
416 struct ocfs2_dinode *di,
417 struct ocfs2_new_group_input *input,
418 struct buffer_head *group_bh)
419{
420 u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
421 u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
422 u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
423 u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
424 u32 total_clusters = le32_to_cpu(di->i_clusters);
425 int ret = -EINVAL;
426
427 if (cluster < total_clusters)
428 mlog(ML_ERROR, "add a group which is in the current volume.\n");
429 else if (input->chain >= cl_count)
430 mlog(ML_ERROR, "input chain exceeds the limit.\n");
431 else if (next_free != cl_count && next_free != input->chain)
432 mlog(ML_ERROR,
433 "the add group should be in chain %u\n", next_free);
434 else if (total_clusters + input->clusters < total_clusters)
435 mlog(ML_ERROR, "add group's clusters overflow.\n");
436 else if (input->clusters > cl_cpg)
437 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
438 else if (input->frees > input->clusters)
439 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
440 else if (total_clusters % cl_cpg != 0)
441 mlog(ML_ERROR,
442 "the last group isn't full. Use group extend first.\n");
443 else if (input->group != ocfs2_which_cluster_group(inode, cluster))
444 mlog(ML_ERROR, "group blkno is invalid\n");
445 else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
446 mlog(ML_ERROR, "group descriptor check failed.\n");
447 else
448 ret = 0;
449
450 return ret;
451}
452
453/* Add a new group descriptor to global_bitmap. */
454int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
455{
456 int ret;
457 handle_t *handle;
458 struct buffer_head *main_bm_bh = NULL;
459 struct inode *main_bm_inode = NULL;
460 struct ocfs2_dinode *fe = NULL;
461 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
462 struct buffer_head *group_bh = NULL;
463 struct ocfs2_group_desc *group = NULL;
464 struct ocfs2_chain_list *cl;
465 struct ocfs2_chain_rec *cr;
466 u16 cl_bpc;
467 u64 bg_ptr;
468
469 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
470 return -EROFS;
471
472 main_bm_inode = ocfs2_get_system_file_inode(osb,
473 GLOBAL_BITMAP_SYSTEM_INODE,
474 OCFS2_INVALID_SLOT);
475 if (!main_bm_inode) {
476 ret = -EINVAL;
477 mlog_errno(ret);
478 goto out;
479 }
480
481 inode_lock(main_bm_inode);
482
483 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
484 if (ret < 0) {
485 mlog_errno(ret);
486 goto out_mutex;
487 }
488
489 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
490
491 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
492 ocfs2_group_bitmap_size(osb->sb, 0,
493 osb->s_feature_incompat) * 8) {
494 mlog(ML_ERROR, "The disk is too old and small."
495 " Force to do offline resize.");
496 ret = -EINVAL;
497 goto out_unlock;
498 }
499
500 ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
501 if (ret < 0) {
502 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
503 "from the device.", (unsigned long long)input->group);
504 goto out_unlock;
505 }
506
507 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
508
509 ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
510 if (ret) {
511 mlog_errno(ret);
512 goto out_free_group_bh;
513 }
514
515 trace_ocfs2_group_add((unsigned long long)input->group,
516 input->chain, input->clusters, input->frees);
517
518 handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
519 if (IS_ERR(handle)) {
520 mlog_errno(PTR_ERR(handle));
521 ret = -EINVAL;
522 goto out_free_group_bh;
523 }
524
525 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
526 cl = &fe->id2.i_chain;
527 cr = &cl->cl_recs[input->chain];
528
529 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
530 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
531 if (ret < 0) {
532 mlog_errno(ret);
533 goto out_commit;
534 }
535
536 group = (struct ocfs2_group_desc *)group_bh->b_data;
537 bg_ptr = le64_to_cpu(group->bg_next_group);
538 group->bg_next_group = cr->c_blkno;
539 ocfs2_journal_dirty(handle, group_bh);
540
541 ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
542 main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
543 if (ret < 0) {
544 group->bg_next_group = cpu_to_le64(bg_ptr);
545 mlog_errno(ret);
546 goto out_commit;
547 }
548
549 if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
550 le16_add_cpu(&cl->cl_next_free_rec, 1);
551 memset(cr, 0, sizeof(struct ocfs2_chain_rec));
552 }
553
554 cr->c_blkno = cpu_to_le64(input->group);
555 le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
556 le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
557
558 le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
559 le32_add_cpu(&fe->id1.bitmap1.i_used,
560 (input->clusters - input->frees) * cl_bpc);
561 le32_add_cpu(&fe->i_clusters, input->clusters);
562
563 ocfs2_journal_dirty(handle, main_bm_bh);
564
565 spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
566 OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
567 le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits);
568 spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
569 i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
570
571 ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
572
573out_commit:
574 ocfs2_commit_trans(osb, handle);
575
576out_free_group_bh:
577 if (ret < 0)
578 ocfs2_remove_from_cache(INODE_CACHE(inode), group_bh);
579 brelse(group_bh);
580
581out_unlock:
582 brelse(main_bm_bh);
583
584 ocfs2_inode_unlock(main_bm_inode, 1);
585
586out_mutex:
587 inode_unlock(main_bm_inode);
588 iput(main_bm_inode);
589
590out:
591 return ret;
592}