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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
20int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
21{
22 int err = 0;
23 struct reiserfs_super_block *sb;
24 struct reiserfs_bitmap_info *bitmap;
25 struct reiserfs_bitmap_info *info;
26 struct reiserfs_bitmap_info *old_bitmap = SB_AP_BITMAP(s);
27 struct buffer_head *bh;
28 struct reiserfs_transaction_handle th;
29 unsigned int bmap_nr_new, bmap_nr;
30 unsigned int block_r_new, block_r;
31
32 struct reiserfs_list_bitmap *jb;
33 struct reiserfs_list_bitmap jbitmap[JOURNAL_NUM_BITMAPS];
34
35 unsigned long int block_count, free_blocks;
36 int i;
37 int copy_size;
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
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;
51 }
52 bforget(bh);
53
54
55
56 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");
60 return -ENOTSUPP;
61 }
62
63
64 block_r = SB_BLOCK_COUNT(s) -
65 (reiserfs_bmap_count(s) - 1) * s->s_blocksize * 8;
66
67
68 bmap_nr_new = block_count_new / (s->s_blocksize * 8);
69 block_r_new = block_count_new - bmap_nr_new * s->s_blocksize * 8;
70 if (block_r_new)
71 bmap_nr_new++;
72 else
73 block_r_new = s->s_blocksize * 8;
74
75
76 block_count = SB_BLOCK_COUNT(s);
77 bmap_nr = reiserfs_bmap_count(s);
78
79
80 if (bmap_nr_new > bmap_nr) {
81
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 return -ENOMEM;
86 }
87
88
89
90
91
92
93
94 copy_size = bmap_nr_new < bmap_nr ? bmap_nr_new : bmap_nr;
95 copy_size =
96 copy_size * sizeof(struct reiserfs_list_bitmap_node *);
97 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
98 struct reiserfs_bitmap_node **node_tmp;
99 jb = SB_JOURNAL(s)->j_list_bitmap + i;
100 memcpy(jbitmap[i].bitmaps, jb->bitmaps, copy_size);
101
102
103
104
105
106 node_tmp = jb->bitmaps;
107 jb->bitmaps = jbitmap[i].bitmaps;
108 vfree(node_tmp);
109 }
110
111
112
113 bitmap =
114 vmalloc(sizeof(struct reiserfs_bitmap_info) * bmap_nr_new);
115 if (!bitmap) {
116
117
118 printk("reiserfs_resize: unable to allocate memory.\n");
119 return -ENOMEM;
120 }
121 memset(bitmap, 0,
122 sizeof(struct reiserfs_bitmap_info) * bmap_nr_new);
123 for (i = 0; i < bmap_nr; i++)
124 bitmap[i] = old_bitmap[i];
125
126
127
128
129
130 for (i = bmap_nr; i < bmap_nr_new; i++) {
131
132
133 bh = sb_bread(s, i * s->s_blocksize * 8);
134 if (!bh) {
135 vfree(bitmap);
136 return -EIO;
137 }
138 memset(bh->b_data, 0, sb_blocksize(sb));
139 reiserfs_test_and_set_le_bit(0, bh->b_data);
140 reiserfs_cache_bitmap_metadata(s, bh, bitmap + i);
141
142 set_buffer_uptodate(bh);
143 mark_buffer_dirty(bh);
144 reiserfs_write_unlock(s);
145 sync_dirty_buffer(bh);
146 reiserfs_write_lock(s);
147
148 bitmap[i].free_count = sb_blocksize(sb) * 8 - 1;
149 brelse(bh);
150 }
151
152 SB_AP_BITMAP(s) = bitmap;
153 vfree(old_bitmap);
154 }
155
156
157
158
159 err = journal_begin(&th, s, 10);
160 if (err)
161 return err;
162
163
164 info = SB_AP_BITMAP(s) + bmap_nr - 1;
165 bh = reiserfs_read_bitmap_block(s, bmap_nr - 1);
166 if (!bh) {
167 int jerr = journal_end(&th, s, 10);
168 if (jerr)
169 return jerr;
170 return -EIO;
171 }
172
173 reiserfs_prepare_for_journal(s, bh, 1);
174 for (i = block_r; i < s->s_blocksize * 8; i++)
175 reiserfs_test_and_clear_le_bit(i, bh->b_data);
176 info->free_count += s->s_blocksize * 8 - block_r;
177
178 journal_mark_dirty(&th, s, bh);
179 brelse(bh);
180
181
182 info = SB_AP_BITMAP(s) + bmap_nr_new - 1;
183 bh = reiserfs_read_bitmap_block(s, bmap_nr_new - 1);
184 if (!bh) {
185 int jerr = journal_end(&th, s, 10);
186 if (jerr)
187 return jerr;
188 return -EIO;
189 }
190
191 reiserfs_prepare_for_journal(s, bh, 1);
192 for (i = block_r_new; i < s->s_blocksize * 8; i++)
193 reiserfs_test_and_set_le_bit(i, bh->b_data);
194 journal_mark_dirty(&th, s, bh);
195 brelse(bh);
196
197 info->free_count -= s->s_blocksize * 8 - block_r_new;
198
199 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
200 free_blocks = SB_FREE_BLOCKS(s);
201 PUT_SB_FREE_BLOCKS(s,
202 free_blocks + (block_count_new - block_count -
203 (bmap_nr_new - bmap_nr)));
204 PUT_SB_BLOCK_COUNT(s, block_count_new);
205 PUT_SB_BMAP_NR(s, bmap_would_wrap(bmap_nr_new) ? : bmap_nr_new);
206 s->s_dirt = 1;
207
208 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
209
210 SB_JOURNAL(s)->j_must_wait = 1;
211 return journal_end(&th, s, 10);
212}
213