blob: 9a17f63c3fd7f3618a44bdf946476e4957dcd50d [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>
Al Virof466c6f2012-03-17 01:16:43 -040016#include "reiserfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/buffer_head.h>
18
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070019int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
Linus Torvalds1da177e2005-04-16 15:20:36 -070020{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070021 int err = 0;
22 struct reiserfs_super_block *sb;
23 struct reiserfs_bitmap_info *bitmap;
Jeff Mahoney0b3dc172006-09-30 23:28:42 -070024 struct reiserfs_bitmap_info *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 struct reiserfs_bitmap_info *old_bitmap = SB_AP_BITMAP(s);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070026 struct buffer_head *bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 struct reiserfs_transaction_handle th;
28 unsigned int bmap_nr_new, bmap_nr;
29 unsigned int block_r_new, block_r;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070030
31 struct reiserfs_list_bitmap *jb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 struct reiserfs_list_bitmap jbitmap[JOURNAL_NUM_BITMAPS];
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070033
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 unsigned long int block_count, free_blocks;
35 int i;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070036 int copy_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38 sb = SB_DISK_SUPER_BLOCK(s);
39
40 if (SB_BLOCK_COUNT(s) >= block_count_new) {
41 printk("can\'t shrink filesystem on-line\n");
42 return -EINVAL;
43 }
44
45 /* check the device size */
46 bh = sb_bread(s, block_count_new - 1);
47 if (!bh) {
48 printk("reiserfs_resize: can\'t read last block\n");
49 return -EINVAL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070050 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 bforget(bh);
52
53 /* old disk layout detection; those partitions can be mounted, but
54 * cannot be resized */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070055 if (SB_BUFFER_WITH_SB(s)->b_blocknr * SB_BUFFER_WITH_SB(s)->b_size
56 != REISERFS_DISK_OFFSET_IN_BYTES) {
57 printk
58 ("reiserfs_resize: unable to resize a reiserfs without distributed bitmap (fs version < 3.5.12)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 return -ENOTSUPP;
60 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070061
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 /* count used bits in last bitmap block */
Jeff Mahoneycb680c12007-10-18 23:39:27 -070063 block_r = SB_BLOCK_COUNT(s) -
64 (reiserfs_bmap_count(s) - 1) * s->s_blocksize * 8;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070065
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 /* count bitmap blocks in new fs */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070067 bmap_nr_new = block_count_new / (s->s_blocksize * 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 block_r_new = block_count_new - bmap_nr_new * s->s_blocksize * 8;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070069 if (block_r_new)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 bmap_nr_new++;
71 else
72 block_r_new = s->s_blocksize * 8;
73
74 /* save old values */
75 block_count = SB_BLOCK_COUNT(s);
Jeff Mahoneycb680c12007-10-18 23:39:27 -070076 bmap_nr = reiserfs_bmap_count(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78 /* resizing of reiserfs bitmaps (journal and real), if needed */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070079 if (bmap_nr_new > bmap_nr) {
80 /* reallocate journal bitmaps */
81 if (reiserfs_allocate_list_bitmaps(s, jbitmap, bmap_nr_new) < 0) {
82 printk
83 ("reiserfs_resize: unable to allocate memory for journal bitmaps\n");
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070084 return -ENOMEM;
85 }
86 /* the new journal bitmaps are zero filled, now we copy in the bitmap
87 ** node pointers from the old journal bitmap structs, and then
88 ** transfer the new data structures into the journal struct.
89 **
90 ** using the copy_size var below allows this code to work for
91 ** both shrinking and expanding the FS.
92 */
93 copy_size = bmap_nr_new < bmap_nr ? bmap_nr_new : bmap_nr;
94 copy_size =
95 copy_size * sizeof(struct reiserfs_list_bitmap_node *);
96 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
97 struct reiserfs_bitmap_node **node_tmp;
98 jb = SB_JOURNAL(s)->j_list_bitmap + i;
99 memcpy(jbitmap[i].bitmaps, jb->bitmaps, copy_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700101 /* just in case vfree schedules on us, copy the new
Jeff Mahoney0222e652009-03-30 14:02:44 -0400102 ** pointer into the journal struct before freeing the
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700103 ** old one
104 */
105 node_tmp = jb->bitmaps;
106 jb->bitmaps = jbitmap[i].bitmaps;
107 vfree(node_tmp);
108 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700110 /* allocate additional bitmap blocks, reallocate array of bitmap
111 * block pointers */
112 bitmap =
Joe Perches558feb02011-05-28 10:36:33 -0700113 vzalloc(sizeof(struct reiserfs_bitmap_info) * bmap_nr_new);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700114 if (!bitmap) {
115 /* Journal bitmaps are still supersized, but the memory isn't
116 * leaked, so I guess it's ok */
117 printk("reiserfs_resize: unable to allocate memory.\n");
118 return -ENOMEM;
119 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700120 for (i = 0; i < bmap_nr; i++)
121 bitmap[i] = old_bitmap[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700123 /* This doesn't go through the journal, but it doesn't have to.
124 * The changes are still atomic: We're synced up when the journal
125 * transaction begins, and the new bitmaps don't matter if the
126 * transaction fails. */
127 for (i = bmap_nr; i < bmap_nr_new; i++) {
Jeff Mahoney50652272006-09-30 23:28:44 -0700128 /* don't use read_bitmap_block since it will cache
129 * the uninitialized bitmap */
130 bh = sb_bread(s, i * s->s_blocksize * 8);
Dmitriy Monakhov2d3466a2007-05-08 00:24:37 -0700131 if (!bh) {
132 vfree(bitmap);
133 return -EIO;
134 }
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700135 memset(bh->b_data, 0, sb_blocksize(sb));
Akinobu Mita0c2fd1bfb2011-07-25 17:13:37 -0700136 reiserfs_set_le_bit(0, bh->b_data);
Jeff Mahoney6f010462006-09-30 23:28:43 -0700137 reiserfs_cache_bitmap_metadata(s, bh, bitmap + i);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700138
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700139 set_buffer_uptodate(bh);
140 mark_buffer_dirty(bh);
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +0200141 reiserfs_write_unlock(s);
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700142 sync_dirty_buffer(bh);
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +0200143 reiserfs_write_lock(s);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700144 // update bitmap_info stuff
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700145 bitmap[i].free_count = sb_blocksize(sb) * 8 - 1;
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700146 brelse(bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700147 }
148 /* free old bitmap blocks array */
149 SB_AP_BITMAP(s) = bitmap;
150 vfree(old_bitmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 /* begin transaction, if there was an error, it's fine. Yes, we have
154 * incorrect bitmaps now, but none of it is ever going to touch the
155 * disk anyway. */
156 err = journal_begin(&th, s, 10);
157 if (err)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700158 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700160 /* Extend old last bitmap block - new blocks have been made available */
161 info = SB_AP_BITMAP(s) + bmap_nr - 1;
Jeff Mahoney50652272006-09-30 23:28:44 -0700162 bh = reiserfs_read_bitmap_block(s, bmap_nr - 1);
163 if (!bh) {
164 int jerr = journal_end(&th, s, 10);
165 if (jerr)
166 return jerr;
167 return -EIO;
168 }
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700169
170 reiserfs_prepare_for_journal(s, bh, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 for (i = block_r; i < s->s_blocksize * 8; i++)
Akinobu Mita0c2fd1bfb2011-07-25 17:13:37 -0700172 reiserfs_clear_le_bit(i, bh->b_data);
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700173 info->free_count += s->s_blocksize * 8 - block_r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700175 journal_mark_dirty(&th, s, bh);
176 brelse(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700178 /* Correct new last bitmap block - It may not be full */
179 info = SB_AP_BITMAP(s) + bmap_nr_new - 1;
Jeff Mahoney50652272006-09-30 23:28:44 -0700180 bh = reiserfs_read_bitmap_block(s, bmap_nr_new - 1);
181 if (!bh) {
182 int jerr = journal_end(&th, s, 10);
183 if (jerr)
184 return jerr;
185 return -EIO;
186 }
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700187
188 reiserfs_prepare_for_journal(s, bh, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 for (i = block_r_new; i < s->s_blocksize * 8; i++)
Akinobu Mita0c2fd1bfb2011-07-25 17:13:37 -0700190 reiserfs_set_le_bit(i, bh->b_data);
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700191 journal_mark_dirty(&th, s, bh);
192 brelse(bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700193
Jeff Mahoney0b3dc172006-09-30 23:28:42 -0700194 info->free_count -= s->s_blocksize * 8 - block_r_new;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700195 /* update super */
196 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 free_blocks = SB_FREE_BLOCKS(s);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700198 PUT_SB_FREE_BLOCKS(s,
199 free_blocks + (block_count_new - block_count -
200 (bmap_nr_new - bmap_nr)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 PUT_SB_BLOCK_COUNT(s, block_count_new);
Jeff Mahoneycb680c12007-10-18 23:39:27 -0700202 PUT_SB_BMAP_NR(s, bmap_would_wrap(bmap_nr_new) ? : bmap_nr_new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 s->s_dirt = 1;
204
205 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 SB_JOURNAL(s)->j_must_wait = 1;
208 return journal_end(&th, s, 10);
209}