Commit | Line | Data |
---|---|---|
0222e657 | 1 | /* |
1da177e4 LT |
2 | * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README |
3 | */ | |
bd4c625c | 4 | |
0222e657 | 5 | /* |
1da177e4 LT |
6 | * 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> | |
f466c6fd | 16 | #include "reiserfs.h" |
1da177e4 LT |
17 | #include <linux/buffer_head.h> |
18 | ||
bd4c625c | 19 | int reiserfs_resize(struct super_block *s, unsigned long block_count_new) |
1da177e4 | 20 | { |
bd4c625c LT |
21 | int err = 0; |
22 | struct reiserfs_super_block *sb; | |
23 | struct reiserfs_bitmap_info *bitmap; | |
0b3dc17b | 24 | struct reiserfs_bitmap_info *info; |
1da177e4 | 25 | struct reiserfs_bitmap_info *old_bitmap = SB_AP_BITMAP(s); |
bd4c625c | 26 | struct buffer_head *bh; |
1da177e4 LT |
27 | struct reiserfs_transaction_handle th; |
28 | unsigned int bmap_nr_new, bmap_nr; | |
29 | unsigned int block_r_new, block_r; | |
bd4c625c LT |
30 | |
31 | struct reiserfs_list_bitmap *jb; | |
1da177e4 | 32 | struct reiserfs_list_bitmap jbitmap[JOURNAL_NUM_BITMAPS]; |
bd4c625c | 33 | |
1da177e4 LT |
34 | unsigned long int block_count, free_blocks; |
35 | int i; | |
bd4c625c | 36 | int copy_size; |
278f6679 | 37 | int depth; |
1da177e4 LT |
38 | |
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 */ | |
278f6679 | 47 | depth = reiserfs_write_unlock_nested(s); |
1da177e4 | 48 | bh = sb_bread(s, block_count_new - 1); |
278f6679 | 49 | reiserfs_write_lock_nested(s, depth); |
1da177e4 LT |
50 | if (!bh) { |
51 | printk("reiserfs_resize: can\'t read last block\n"); | |
52 | return -EINVAL; | |
bd4c625c | 53 | } |
1da177e4 LT |
54 | bforget(bh); |
55 | ||
56 | /* old disk layout detection; those partitions can be mounted, but | |
57 | * cannot be resized */ | |
bd4c625c LT |
58 | if (SB_BUFFER_WITH_SB(s)->b_blocknr * SB_BUFFER_WITH_SB(s)->b_size |
59 | != REISERFS_DISK_OFFSET_IN_BYTES) { | |
60 | printk | |
61 | ("reiserfs_resize: unable to resize a reiserfs without distributed bitmap (fs version < 3.5.12)\n"); | |
1da177e4 LT |
62 | return -ENOTSUPP; |
63 | } | |
bd4c625c | 64 | |
1da177e4 | 65 | /* count used bits in last bitmap block */ |
cb680c1b JM |
66 | block_r = SB_BLOCK_COUNT(s) - |
67 | (reiserfs_bmap_count(s) - 1) * s->s_blocksize * 8; | |
bd4c625c | 68 | |
1da177e4 | 69 | /* count bitmap blocks in new fs */ |
bd4c625c | 70 | bmap_nr_new = block_count_new / (s->s_blocksize * 8); |
1da177e4 | 71 | block_r_new = block_count_new - bmap_nr_new * s->s_blocksize * 8; |
bd4c625c | 72 | if (block_r_new) |
1da177e4 LT |
73 | bmap_nr_new++; |
74 | else | |
75 | block_r_new = s->s_blocksize * 8; | |
76 | ||
77 | /* save old values */ | |
78 | block_count = SB_BLOCK_COUNT(s); | |
cb680c1b | 79 | bmap_nr = reiserfs_bmap_count(s); |
1da177e4 LT |
80 | |
81 | /* resizing of reiserfs bitmaps (journal and real), if needed */ | |
bd4c625c LT |
82 | if (bmap_nr_new > bmap_nr) { |
83 | /* reallocate journal bitmaps */ | |
84 | if (reiserfs_allocate_list_bitmaps(s, jbitmap, bmap_nr_new) < 0) { | |
85 | printk | |
86 | ("reiserfs_resize: unable to allocate memory for journal bitmaps\n"); | |
bd4c625c LT |
87 | return -ENOMEM; |
88 | } | |
89 | /* the new journal bitmaps are zero filled, now we copy in the bitmap | |
90 | ** node pointers from the old journal bitmap structs, and then | |
91 | ** transfer the new data structures into the journal struct. | |
92 | ** | |
93 | ** using the copy_size var below allows this code to work for | |
94 | ** both shrinking and expanding the FS. | |
95 | */ | |
96 | copy_size = bmap_nr_new < bmap_nr ? bmap_nr_new : bmap_nr; | |
97 | copy_size = | |
98 | copy_size * sizeof(struct reiserfs_list_bitmap_node *); | |
99 | for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { | |
100 | struct reiserfs_bitmap_node **node_tmp; | |
101 | jb = SB_JOURNAL(s)->j_list_bitmap + i; | |
102 | memcpy(jbitmap[i].bitmaps, jb->bitmaps, copy_size); | |
103 | ||
104 | /* just in case vfree schedules on us, copy the new | |
0222e657 | 105 | ** pointer into the journal struct before freeing the |
bd4c625c LT |
106 | ** old one |
107 | */ | |
108 | node_tmp = jb->bitmaps; | |
109 | jb->bitmaps = jbitmap[i].bitmaps; | |
110 | vfree(node_tmp); | |
111 | } | |
112 | ||
113 | /* allocate additional bitmap blocks, reallocate array of bitmap | |
114 | * block pointers */ | |
115 | bitmap = | |
558feb08 | 116 | vzalloc(sizeof(struct reiserfs_bitmap_info) * bmap_nr_new); |
bd4c625c LT |
117 | if (!bitmap) { |
118 | /* Journal bitmaps are still supersized, but the memory isn't | |
119 | * leaked, so I guess it's ok */ | |
120 | printk("reiserfs_resize: unable to allocate memory.\n"); | |
121 | return -ENOMEM; | |
122 | } | |
bd4c625c LT |
123 | for (i = 0; i < bmap_nr; i++) |
124 | bitmap[i] = old_bitmap[i]; | |
125 | ||
126 | /* This doesn't go through the journal, but it doesn't have to. | |
127 | * The changes are still atomic: We're synced up when the journal | |
128 | * transaction begins, and the new bitmaps don't matter if the | |
129 | * transaction fails. */ | |
130 | for (i = bmap_nr; i < bmap_nr_new; i++) { | |
278f6679 | 131 | int depth; |
5065227b JM |
132 | /* don't use read_bitmap_block since it will cache |
133 | * the uninitialized bitmap */ | |
278f6679 | 134 | depth = reiserfs_write_unlock_nested(s); |
5065227b | 135 | bh = sb_bread(s, i * s->s_blocksize * 8); |
278f6679 | 136 | reiserfs_write_lock_nested(s, depth); |
2d3466a3 DM |
137 | if (!bh) { |
138 | vfree(bitmap); | |
139 | return -EIO; | |
140 | } | |
0b3dc17b | 141 | memset(bh->b_data, 0, sb_blocksize(sb)); |
0c2fd1bf | 142 | reiserfs_set_le_bit(0, bh->b_data); |
6f01046b | 143 | reiserfs_cache_bitmap_metadata(s, bh, bitmap + i); |
0b3dc17b JM |
144 | |
145 | set_buffer_uptodate(bh); | |
146 | mark_buffer_dirty(bh); | |
278f6679 | 147 | depth = reiserfs_write_unlock_nested(s); |
0b3dc17b | 148 | sync_dirty_buffer(bh); |
278f6679 | 149 | reiserfs_write_lock_nested(s, depth); |
bd4c625c | 150 | // update bitmap_info stuff |
bd4c625c | 151 | bitmap[i].free_count = sb_blocksize(sb) * 8 - 1; |
0b3dc17b | 152 | brelse(bh); |
bd4c625c LT |
153 | } |
154 | /* free old bitmap blocks array */ | |
155 | SB_AP_BITMAP(s) = bitmap; | |
156 | vfree(old_bitmap); | |
1da177e4 | 157 | } |
bd4c625c | 158 | |
1da177e4 LT |
159 | /* begin transaction, if there was an error, it's fine. Yes, we have |
160 | * incorrect bitmaps now, but none of it is ever going to touch the | |
161 | * disk anyway. */ | |
162 | err = journal_begin(&th, s, 10); | |
163 | if (err) | |
bd4c625c | 164 | return err; |
1da177e4 | 165 | |
0b3dc17b JM |
166 | /* Extend old last bitmap block - new blocks have been made available */ |
167 | info = SB_AP_BITMAP(s) + bmap_nr - 1; | |
5065227b JM |
168 | bh = reiserfs_read_bitmap_block(s, bmap_nr - 1); |
169 | if (!bh) { | |
170 | int jerr = journal_end(&th, s, 10); | |
171 | if (jerr) | |
172 | return jerr; | |
173 | return -EIO; | |
174 | } | |
0b3dc17b JM |
175 | |
176 | reiserfs_prepare_for_journal(s, bh, 1); | |
1da177e4 | 177 | for (i = block_r; i < s->s_blocksize * 8; i++) |
0c2fd1bf | 178 | reiserfs_clear_le_bit(i, bh->b_data); |
0b3dc17b | 179 | info->free_count += s->s_blocksize * 8 - block_r; |
0b3dc17b JM |
180 | |
181 | journal_mark_dirty(&th, s, bh); | |
182 | brelse(bh); | |
1da177e4 | 183 | |
0b3dc17b JM |
184 | /* Correct new last bitmap block - It may not be full */ |
185 | info = SB_AP_BITMAP(s) + bmap_nr_new - 1; | |
5065227b JM |
186 | bh = reiserfs_read_bitmap_block(s, bmap_nr_new - 1); |
187 | if (!bh) { | |
188 | int jerr = journal_end(&th, s, 10); | |
189 | if (jerr) | |
190 | return jerr; | |
191 | return -EIO; | |
192 | } | |
1da177e4 | 193 | |
0b3dc17b | 194 | reiserfs_prepare_for_journal(s, bh, 1); |
1da177e4 | 195 | for (i = block_r_new; i < s->s_blocksize * 8; i++) |
0c2fd1bf | 196 | reiserfs_set_le_bit(i, bh->b_data); |
0b3dc17b JM |
197 | journal_mark_dirty(&th, s, bh); |
198 | brelse(bh); | |
bd4c625c | 199 | |
0b3dc17b | 200 | info->free_count -= s->s_blocksize * 8 - block_r_new; |
bd4c625c LT |
201 | /* update super */ |
202 | reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); | |
1da177e4 | 203 | free_blocks = SB_FREE_BLOCKS(s); |
bd4c625c LT |
204 | PUT_SB_FREE_BLOCKS(s, |
205 | free_blocks + (block_count_new - block_count - | |
206 | (bmap_nr_new - bmap_nr))); | |
1da177e4 | 207 | PUT_SB_BLOCK_COUNT(s, block_count_new); |
cb680c1b | 208 | PUT_SB_BMAP_NR(s, bmap_would_wrap(bmap_nr_new) ? : bmap_nr_new); |
1da177e4 LT |
209 | |
210 | journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s)); | |
bd4c625c | 211 | |
1da177e4 LT |
212 | SB_JOURNAL(s)->j_must_wait = 1; |
213 | return journal_end(&th, s, 10); | |
214 | } |