Root/fs/ocfs2/resize.c

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

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