blob: 238e9d9b31e04bf877f1644630990672d1c5daba [file] [log] [blame]
Jeff Mahoney0222e652009-03-30 14:02:44 -04001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07004
Jeff Mahoney0222e652009-03-30 14:02:44 -04005/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * Written by Alexander Zarochentcev.
7 *
8 * The kernel part of the (on-line) reiserfs resizer.
9 */
10
11#include <linux/kernel.h>
12#include <linux/mm.h>
13#include <linux/vmalloc.h>
14#include <linux/string.h>
15#include <linux/errno.h>
16#include <linux/reiserfs_fs.h>
17#include <linux/reiserfs_fs_sb.h>
18#include <linux/buffer_head.h>
19
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070020int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
Linus Torvalds1da177e2005-04-16 15:20:36 -070021{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070022 int err = 0;
23 struct reiserfs_super_block *sb;
24 struct reiserfs_bitmap_info *bitmap;
Jeff Mahoney0b3dc172006-09-30 23:28:42 -070025 struct reiserfs_bitmap_info *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 struct reiserfs_bitmap_info *old_bitmap = SB_AP_BITMAP(s);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070027 struct buffer_head *bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 struct reiserfs_transaction_handle th;
29 unsigned int bmap_nr_new, bmap_nr;
30 unsigned int block_r_new, block_r;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070031
32 struct reiserfs_list_bitmap *jb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 struct reiserfs_list_bitmap jbitmap[JOURNAL_NUM_BITMAPS];
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070034
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 unsigned long int block_count, free_blocks;
36 int i;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070037 int copy_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39 sb = SB_DISK_SUPER_BLOCK(s);
40
41 if (SB_BLOCK_COUNT(s) >= block_count_new) {
42 printk("can\'t shrink filesystem on-line\n");
43 return -EINVAL;
44 }
45
46 /* check the device size */
47 bh = sb_bread(s, block_count_new - 1);
48 if (!bh) {
49 printk("reiserfs_resize: can\'t read last block\n");
50 return -EINVAL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070051 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 bforget(bh);
53
54 /* old disk layout detection; those partitions can be mounted, but
55 * cannot be resized */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070056 if (SB_BUFFER_WITH_SB(s)->b_blocknr * SB_BUFFER_WITH_SB(s)->b_size
57 != REISERFS_DISK_OFFSET_IN_BYTES) {
58 printk
59 ("reiserfs_resize: unable to resize a reiserfs without distributed bitmap (fs version < 3.5.12)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 return -ENOTSUPP;
61 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070062
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 /* count used bits in last bitmap block */
Jeff Mahoneycb680c12007-10-18 23:39:27 -070064 block_r = SB_BLOCK_COUNT(s) -
65 (reiserfs_bmap_count(s) - 1) * s->s_blocksize * 8;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070066
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 /* count bitmap blocks in new fs */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070068 bmap_nr_new = block_count_new / (s->s_blocksize * 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 block_r_new = block_count_new - bmap_nr_new * s->s_blocksize * 8;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070070 if (block_r_new)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 bmap_nr_new++;
72 else
73 block_r_new = s->s_blocksize * 8;
74
75 /* save old values */
76 block_count = SB_BLOCK_COUNT(s);
Jeff Mahoneycb680c12007-10-18 23:39:27 -070077 bmap_nr = reiserfs_bmap_count(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79 /* resizing of reiserfs bitmaps (journal and real), if needed */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070080 if (bmap_nr_new > bmap_nr) {
81 /* reallocate journal bitmaps */
82 if (reiserfs_allocate_list_bitmaps(s, jbitmap, bmap_nr_new) < 0) {
83 printk
84 ("reiserfs_resize: unable to allocate memory for journal bitmaps\n");
85 unlock_super(s);
86 return -ENOMEM;
87 }
88 /* the new journal bitmaps are zero filled, now we copy in the bitmap
89 ** node pointers from the old journal bitmap structs, and then
90 ** transfer the new data structures into the journal struct.
91 **
92 ** using the copy_size var below allows this code to work for
93 ** both shrinking and expanding the FS.
94 */
95 copy_size = bmap_nr_new < bmap_nr ? bmap_nr_new : bmap_nr;
96 copy_size =
97 copy_size * sizeof(struct reiserfs_list_bitmap_node *);
98 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
99 struct reiserfs_bitmap_node **node_tmp;
100 jb = SB_JOURNAL(s)->j_list_bitmap + i;
101 memcpy(jbitmap[i].bitmaps, jb->bitmaps, copy_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700103 /* just in case vfree schedules on us, copy the new
Jeff Mahoney0222e652009-03-30 14:02:44 -0400104 ** pointer into the journal struct before freeing the
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700105 ** old one
106 */
107 node_tmp = jb->bitmaps;
108 jb->bitmaps = jbitmap[i].bitmaps;
109 vfree(node_tmp);
110 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700112 /* allocate additional bitmap blocks, reallocate array of bitmap
113 * block pointers */
114 bitmap =
115 vmalloc(sizeof(struct reiserfs_bitmap_info) * bmap_nr_new);
116 if (!bitmap) {
117 /* Journal bitmaps are still supersized, but the memory isn't
118 * leaked, so I guess it's ok */
119 printk("reiserfs_resize: unable to allocate memory.\n");
120 return -ENOMEM;
121 }
122 memset(bitmap, 0,
Jeff Mahoney6c57c2c2007-10-18 23:39:25 -0700123 sizeof(struct reiserfs_bitmap_info) * bmap_nr_new);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700124 for (i = 0; i < bmap_nr; i++)
125 bitmap[i] = old_bitmap[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700127 /* This doesn't go through the journal, but it doesn't have to.
128 * The changes are still atomic: We're synced up when the journal
129 * transaction begins, and the new bitmaps don't matter if the
130 * transaction fails. */
131 for (i = bmap_nr; i < bmap_nr_new; i++) {
Jeff Mahoney50652272006-09-30 23:28:44 -0700132 /* don't use read_bitmap_block since it will cache
133 * the uninitialized bitmap */
134 bh = sb_bread(s, i * s->s_blocksize * 8);
Dmitriy Monakhov2d3466a2007-05-08 00:24:37 -0700135 if (!bh) {
136 vfree(bitmap);
137 return -EIO;
138 }
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700139 memset(bh->b_data, 0, sb_blocksize(sb));
140 reiserfs_test_and_set_le_bit(0, bh->b_data);
Jeff Mahoney6f010462006-09-30 23:28:43 -0700141 reiserfs_cache_bitmap_metadata(s, bh, bitmap + i);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700142
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700143 set_buffer_uptodate(bh);
144 mark_buffer_dirty(bh);
145 sync_dirty_buffer(bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700146 // update bitmap_info stuff
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700147 bitmap[i].free_count = sb_blocksize(sb) * 8 - 1;
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700148 brelse(bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700149 }
150 /* free old bitmap blocks array */
151 SB_AP_BITMAP(s) = bitmap;
152 vfree(old_bitmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 /* begin transaction, if there was an error, it's fine. Yes, we have
156 * incorrect bitmaps now, but none of it is ever going to touch the
157 * disk anyway. */
158 err = journal_begin(&th, s, 10);
159 if (err)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700160 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700162 /* Extend old last bitmap block - new blocks have been made available */
163 info = SB_AP_BITMAP(s) + bmap_nr - 1;
Jeff Mahoney50652272006-09-30 23:28:44 -0700164 bh = reiserfs_read_bitmap_block(s, bmap_nr - 1);
165 if (!bh) {
166 int jerr = journal_end(&th, s, 10);
167 if (jerr)
168 return jerr;
169 return -EIO;
170 }
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700171
172 reiserfs_prepare_for_journal(s, bh, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 for (i = block_r; i < s->s_blocksize * 8; i++)
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700174 reiserfs_test_and_clear_le_bit(i, bh->b_data);
175 info->free_count += s->s_blocksize * 8 - block_r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700177 journal_mark_dirty(&th, s, bh);
178 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700180 /* Correct new last bitmap block - It may not be full */
181 info = SB_AP_BITMAP(s) + bmap_nr_new - 1;
Jeff Mahoney50652272006-09-30 23:28:44 -0700182 bh = reiserfs_read_bitmap_block(s, bmap_nr_new - 1);
183 if (!bh) {
184 int jerr = journal_end(&th, s, 10);
185 if (jerr)
186 return jerr;
187 return -EIO;
188 }
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700189
190 reiserfs_prepare_for_journal(s, bh, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 for (i = block_r_new; i < s->s_blocksize * 8; i++)
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700192 reiserfs_test_and_set_le_bit(i, bh->b_data);
193 journal_mark_dirty(&th, s, bh);
194 brelse(bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700195
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700196 info->free_count -= s->s_blocksize * 8 - block_r_new;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700197 /* update super */
198 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 free_blocks = SB_FREE_BLOCKS(s);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700200 PUT_SB_FREE_BLOCKS(s,
201 free_blocks + (block_count_new - block_count -
202 (bmap_nr_new - bmap_nr)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 PUT_SB_BLOCK_COUNT(s, block_count_new);
Jeff Mahoneycb680c12007-10-18 23:39:27 -0700204 PUT_SB_BMAP_NR(s, bmap_would_wrap(bmap_nr_new) ? : bmap_nr_new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 s->s_dirt = 1;
206
207 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 SB_JOURNAL(s)->j_must_wait = 1;
210 return journal_end(&th, s, 10);
211}