1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
7 * Inspired by ext3/resize.c.
9 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
28 #include <linux/types.h>
30 #define MLOG_MASK_PREFIX ML_DISK_ALLOC
31 #include <cluster/masklog.h>
43 #include "buffer_head_io.h"
48 * Check whether there are new backup superblocks exist
49 * in the last group. If there are some, mark them or clear
52 * Return how many backups we find in the last group.
54 static u16 ocfs2_calc_new_backup_super(struct inode *inode,
55 struct ocfs2_group_desc *gd,
57 u32 first_new_cluster,
64 u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
66 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
67 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
68 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
70 gd_blkno = ocfs2_which_cluster_group(inode, cluster);
71 if (gd_blkno < lgd_blkno)
73 else if (gd_blkno > lgd_blkno)
77 ocfs2_set_bit(cluster % cl_cpg,
78 (unsigned long *)gd->bg_bitmap);
80 ocfs2_clear_bit(cluster % cl_cpg,
81 (unsigned long *)gd->bg_bitmap);
89 static int ocfs2_update_last_group_and_inode(handle_t *handle,
90 struct inode *bm_inode,
91 struct buffer_head *bm_bh,
92 struct buffer_head *group_bh,
93 u32 first_new_cluster,
97 struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
98 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
99 struct ocfs2_chain_list *cl = &fe->id2.i_chain;
100 struct ocfs2_chain_rec *cr;
101 struct ocfs2_group_desc *group;
102 u16 chain, num_bits, backups = 0;
103 u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
104 u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
106 mlog_entry("(new_clusters=%d, first_new_cluster = %u)\n",
107 new_clusters, first_new_cluster);
109 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
110 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
116 group = (struct ocfs2_group_desc *)group_bh->b_data;
118 /* update the group first. */
119 num_bits = new_clusters * cl_bpc;
120 le16_add_cpu(&group->bg_bits, num_bits);
121 le16_add_cpu(&group->bg_free_bits_count, num_bits);
124 * check whether there are some new backup superblocks exist in
125 * this group and update the group bitmap accordingly.
127 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
128 OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
129 backups = ocfs2_calc_new_backup_super(bm_inode,
134 le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
137 ocfs2_journal_dirty(handle, group_bh);
139 /* update the inode accordingly. */
140 ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
141 OCFS2_JOURNAL_ACCESS_WRITE);
147 chain = le16_to_cpu(group->bg_chain);
148 cr = (&cl->cl_recs[chain]);
149 le32_add_cpu(&cr->c_total, num_bits);
150 le32_add_cpu(&cr->c_free, num_bits);
151 le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
152 le32_add_cpu(&fe->i_clusters, new_clusters);
155 le32_add_cpu(&cr->c_free, -1 * backups);
156 le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
159 spin_lock(&OCFS2_I(bm_inode)->ip_lock);
160 OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
161 le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits);
162 spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
163 i_size_write(bm_inode, le64_to_cpu(fe->i_size));
165 ocfs2_journal_dirty(handle, bm_bh);
169 ocfs2_calc_new_backup_super(bm_inode,
174 le16_add_cpu(&group->bg_free_bits_count, backups);
175 le16_add_cpu(&group->bg_bits, -1 * num_bits);
176 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
183 static int update_backups(struct inode * inode, u32 clusters, char *data)
188 struct buffer_head *backup = NULL;
189 struct ocfs2_dinode *backup_di = NULL;
190 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
192 /* calculate the real backups we need to update. */
193 for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
194 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
195 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
196 if (cluster > clusters)
199 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
205 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
207 backup_di = (struct ocfs2_dinode *)backup->b_data;
208 backup_di->i_blkno = cpu_to_le64(blkno);
210 ret = ocfs2_write_super_or_backup(osb, backup);
222 static void ocfs2_update_super_and_backups(struct inode *inode,
227 struct buffer_head *super_bh = NULL;
228 struct ocfs2_dinode *super_di = NULL;
229 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
232 * update the superblock last.
233 * It doesn't matter if the write failed.
235 ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
242 super_di = (struct ocfs2_dinode *)super_bh->b_data;
243 le32_add_cpu(&super_di->i_clusters, new_clusters);
244 clusters = le32_to_cpu(super_di->i_clusters);
246 ret = ocfs2_write_super_or_backup(osb, super_bh);
252 if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
253 ret = update_backups(inode, clusters, super_bh->b_data);
258 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
259 " during fs resize. This condition is not fatal,"
260 " but fsck.ocfs2 should be run to fix it\n",
266 * Extend the filesystem to the new number of clusters specified. This entry
267 * point is only used to extend the current filesystem to the end of the last
270 int ocfs2_group_extend(struct inode * inode, int new_clusters)
274 struct buffer_head *main_bm_bh = NULL;
275 struct buffer_head *group_bh = NULL;
276 struct inode *main_bm_inode = NULL;
277 struct ocfs2_dinode *fe = NULL;
278 struct ocfs2_group_desc *group = NULL;
279 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
281 u32 first_new_cluster;
286 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
289 if (new_clusters < 0)
291 else if (new_clusters == 0)
294 main_bm_inode = ocfs2_get_system_file_inode(osb,
295 GLOBAL_BITMAP_SYSTEM_INODE,
297 if (!main_bm_inode) {
303 mutex_lock(&main_bm_inode->i_mutex);
305 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
311 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
313 /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
314 * so any corruption is a code bug. */
315 BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
317 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
318 ocfs2_group_bitmap_size(osb->sb, 0) * 8) {
319 mlog(ML_ERROR, "The disk is too old and small. "
320 "Force to do offline resize.");
325 first_new_cluster = le32_to_cpu(fe->i_clusters);
326 lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
327 first_new_cluster - 1);
329 ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
335 group = (struct ocfs2_group_desc *)group_bh->b_data;
337 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
338 if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
339 le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
344 mlog(0, "extend the last group at %llu, new clusters = %d\n",
345 (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
347 handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
348 if (IS_ERR(handle)) {
349 mlog_errno(PTR_ERR(handle));
354 /* update the last group descriptor and inode. */
355 ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
356 main_bm_bh, group_bh,
364 ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
367 ocfs2_commit_trans(osb, handle);
372 ocfs2_inode_unlock(main_bm_inode, 1);
375 mutex_unlock(&main_bm_inode->i_mutex);
383 static int ocfs2_check_new_group(struct inode *inode,
384 struct ocfs2_dinode *di,
385 struct ocfs2_new_group_input *input,
386 struct buffer_head *group_bh)
389 struct ocfs2_group_desc *gd =
390 (struct ocfs2_group_desc *)group_bh->b_data;
391 u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
393 ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
398 if (le16_to_cpu(gd->bg_chain) != input->chain)
399 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
400 "while input has %u set.\n",
401 (unsigned long long)le64_to_cpu(gd->bg_blkno),
402 le16_to_cpu(gd->bg_chain), input->chain);
403 else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
404 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
405 "input has %u clusters set\n",
406 (unsigned long long)le64_to_cpu(gd->bg_blkno),
407 le16_to_cpu(gd->bg_bits), input->clusters);
408 else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
409 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
410 "but it should have %u set\n",
411 (unsigned long long)le64_to_cpu(gd->bg_blkno),
412 le16_to_cpu(gd->bg_bits),
413 input->frees * cl_bpc);
421 static int ocfs2_verify_group_and_input(struct inode *inode,
422 struct ocfs2_dinode *di,
423 struct ocfs2_new_group_input *input,
424 struct buffer_head *group_bh)
426 u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
427 u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
428 u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
429 u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
430 u32 total_clusters = le32_to_cpu(di->i_clusters);
433 if (cluster < total_clusters)
434 mlog(ML_ERROR, "add a group which is in the current volume.\n");
435 else if (input->chain >= cl_count)
436 mlog(ML_ERROR, "input chain exceeds the limit.\n");
437 else if (next_free != cl_count && next_free != input->chain)
439 "the add group should be in chain %u\n", next_free);
440 else if (total_clusters + input->clusters < total_clusters)
441 mlog(ML_ERROR, "add group's clusters overflow.\n");
442 else if (input->clusters > cl_cpg)
443 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
444 else if (input->frees > input->clusters)
445 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
446 else if (total_clusters % cl_cpg != 0)
448 "the last group isn't full. Use group extend first.\n");
449 else if (input->group != ocfs2_which_cluster_group(inode, cluster))
450 mlog(ML_ERROR, "group blkno is invalid\n");
451 else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
452 mlog(ML_ERROR, "group descriptor check failed.\n");
459 /* Add a new group descriptor to global_bitmap. */
460 int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
464 struct buffer_head *main_bm_bh = NULL;
465 struct inode *main_bm_inode = NULL;
466 struct ocfs2_dinode *fe = NULL;
467 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
468 struct buffer_head *group_bh = NULL;
469 struct ocfs2_group_desc *group = NULL;
470 struct ocfs2_chain_list *cl;
471 struct ocfs2_chain_rec *cr;
476 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
479 main_bm_inode = ocfs2_get_system_file_inode(osb,
480 GLOBAL_BITMAP_SYSTEM_INODE,
482 if (!main_bm_inode) {
488 mutex_lock(&main_bm_inode->i_mutex);
490 ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
496 fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
498 if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
499 ocfs2_group_bitmap_size(osb->sb, 0) * 8) {
500 mlog(ML_ERROR, "The disk is too old and small."
501 " Force to do offline resize.");
506 ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
508 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
509 "from the device.", (unsigned long long)input->group);
513 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
515 ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
521 mlog(0, "Add a new group %llu in chain = %u, length = %u\n",
522 (unsigned long long)input->group, input->chain, input->clusters);
524 handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
525 if (IS_ERR(handle)) {
526 mlog_errno(PTR_ERR(handle));
531 cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
532 cl = &fe->id2.i_chain;
533 cr = &cl->cl_recs[input->chain];
535 ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
536 group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
542 group = (struct ocfs2_group_desc *)group_bh->b_data;
543 group->bg_next_group = cr->c_blkno;
544 ocfs2_journal_dirty(handle, group_bh);
546 ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
547 main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
553 if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
554 le16_add_cpu(&cl->cl_next_free_rec, 1);
555 memset(cr, 0, sizeof(struct ocfs2_chain_rec));
558 cr->c_blkno = cpu_to_le64(input->group);
559 le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
560 le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
562 le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
563 le32_add_cpu(&fe->id1.bitmap1.i_used,
564 (input->clusters - input->frees) * cl_bpc);
565 le32_add_cpu(&fe->i_clusters, input->clusters);
567 ocfs2_journal_dirty(handle, main_bm_bh);
569 spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
570 OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
571 le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits);
572 spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
573 i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
575 ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
578 ocfs2_commit_trans(osb, handle);
583 ocfs2_inode_unlock(main_bm_inode, 1);
586 mutex_unlock(&main_bm_inode->i_mutex);