1 // SPDX-License-Identifier: GPL-2.0-or-later
6 * Inspired by ext3/resize.c.
8 * Copyright (C) 2007 Oracle. All rights reserved.
12 #include <linux/types.h>
14 #include <cluster/masklog.h>
25 #include "ocfs2_trace.h"
27 #include "buffer_head_io.h"
32 * Check whether there are new backup superblocks exist
33 * in the last group. If there are some, mark them or clear
36 * Return how many backups we find in the last group.
38 static u16 ocfs2_calc_new_backup_super(struct inode *inode,
39 struct ocfs2_group_desc *gd,
46 u32 cluster, lgd_cluster;
47 u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
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);
53 gd_blkno = ocfs2_which_cluster_group(inode, cluster);
54 if (gd_blkno < lgd_blkno)
56 else if (gd_blkno > lgd_blkno)
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)
66 ocfs2_set_bit(cluster % cl_cpg,
67 (unsigned long *)gd->bg_bitmap);
69 ocfs2_clear_bit(cluster % cl_cpg,
70 (unsigned long *)gd->bg_bitmap);
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,
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);
95 __le16 old_bg_contig_free_bits;
97 trace_ocfs2_update_last_group_and_inode(new_clusters,
100 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
101 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
107 group = (struct ocfs2_group_desc *)group_bh->b_data;
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);
116 * check whether there are some new backup superblocks exist in
117 * this group and update the group bitmap accordingly.
119 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
120 OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
121 backups = ocfs2_calc_new_backup_super(bm_inode,
123 cl_cpg, old_bg_clusters, 1);
124 le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
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);
132 ocfs2_journal_dirty(handle, group_bh);
134 /* update the inode accordingly. */
135 ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
136 OCFS2_JOURNAL_ACCESS_WRITE);
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);
150 le32_add_cpu(&cr->c_free, -1 * backups);
151 le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
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));
160 ocfs2_journal_dirty(handle, bm_bh);
164 ocfs2_calc_new_backup_super(bm_inode,
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;
178 static int update_backups(struct inode * inode, u32 clusters, char *data)
183 struct buffer_head *backup = NULL;
184 struct ocfs2_dinode *backup_di = NULL;
185 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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)
194 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
200 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
202 backup_di = (struct ocfs2_dinode *)backup->b_data;
203 backup_di->i_blkno = cpu_to_le64(blkno);
205 ret = ocfs2_write_super_or_backup(osb, backup);
217 static void ocfs2_update_super_and_backups(struct inode *inode,
222 struct buffer_head *super_bh = NULL;
223 struct ocfs2_dinode *super_di = NULL;
224 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
227 * update the superblock last.
228 * It doesn't matter if the write failed.
230 ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
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);
241 ret = ocfs2_write_super_or_backup(osb, super_bh);
247 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
248 ret = update_backups(inode, clusters, super_bh->b_data);
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",
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
265 int ocfs2_group_extend(struct inode * inode, int new_clusters)
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);
276 u32 first_new_cluster;
279 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
282 if (new_clusters < 0)
284 else if (new_clusters == 0)
287 main_bm_inode = ocfs2_get_system_file_inode(osb,
288 GLOBAL_BITMAP_SYSTEM_INODE,
290 if (!main_bm_inode) {
296 inode_lock(main_bm_inode);
298 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
304 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
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));
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.");
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);
323 ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
329 group = (struct ocfs2_group_desc *)group_bh->b_data;
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)) {
339 trace_ocfs2_group_extend(
340 (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
342 handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
343 if (IS_ERR(handle)) {
344 mlog_errno(PTR_ERR(handle));
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,
359 ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
362 ocfs2_commit_trans(osb, handle);
367 ocfs2_inode_unlock(main_bm_inode, 1);
370 inode_unlock(main_bm_inode);
377 static 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)
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);
387 ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
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);
415 static 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)
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);
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)
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)
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");
453 /* Add a new group descriptor to global_bitmap. */
454 int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
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;
469 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
472 main_bm_inode = ocfs2_get_system_file_inode(osb,
473 GLOBAL_BITMAP_SYSTEM_INODE,
475 if (!main_bm_inode) {
481 inode_lock(main_bm_inode);
483 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
489 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
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.");
500 ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
502 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
503 "from the device.", (unsigned long long)input->group);
507 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
509 ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
512 goto out_free_group_bh;
515 trace_ocfs2_group_add((unsigned long long)input->group,
516 input->chain, input->clusters, input->frees);
518 handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
519 if (IS_ERR(handle)) {
520 mlog_errno(PTR_ERR(handle));
522 goto out_free_group_bh;
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];
529 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
530 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
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);
541 ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
542 main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
544 group->bg_next_group = cpu_to_le64(bg_ptr);
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));
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);
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);
563 ocfs2_journal_dirty(handle, main_bm_bh);
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));
571 ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
574 ocfs2_commit_trans(osb, handle);
582 ocfs2_inode_unlock(main_bm_inode, 1);
585 inode_unlock(main_bm_inode);