1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/*
* expand.c --- expand an ext2fs directory
*
* Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "ext2_fs.h"
#include "ext2fs.h"
struct expand_dir_struct {
int done;
int newblocks;
errcode_t err;
};
static int expand_dir_proc(ext2_filsys fs,
blk_t *blocknr,
e2_blkcnt_t blockcnt,
blk_t ref_block,
int ref_offset,
void *priv_data)
{
struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
blk_t new_blk;
static blk_t last_blk = 0;
char *block;
errcode_t retval;
int group;
if (*blocknr) {
last_blk = *blocknr;
return 0;
}
retval = ext2fs_new_block(fs, last_blk, 0, &new_blk);
if (retval) {
es->err = retval;
return BLOCK_ABORT;
}
if (blockcnt > 0) {
retval = ext2fs_new_dir_block(fs, 0, 0, &block);
if (retval) {
es->err = retval;
return BLOCK_ABORT;
}
es->done = 1;
retval = ext2fs_write_dir_block(fs, new_blk, block);
} else {
retval = ext2fs_get_mem(fs->blocksize, (void **) &block);
if (retval) {
es->err = retval;
return BLOCK_ABORT;
}
memset(block, 0, fs->blocksize);
retval = io_channel_write_blk(fs->io, new_blk, 1, block);
}
if (retval) {
es->err = retval;
return BLOCK_ABORT;
}
ext2fs_free_mem((void **) &block);
*blocknr = new_blk;
ext2fs_mark_block_bitmap(fs->block_map, new_blk);
ext2fs_mark_bb_dirty(fs);
group = ext2fs_group_of_blk(fs, new_blk);
fs->group_desc[group].bg_free_blocks_count--;
fs->super->s_free_blocks_count--;
ext2fs_mark_super_dirty(fs);
es->newblocks++;
if (es->done)
return (BLOCK_CHANGED | BLOCK_ABORT);
else
return BLOCK_CHANGED;
}
errcode_t ext2fs_expand_dir(ext2_filsys fs, ext2_ino_t dir)
{
errcode_t retval;
struct expand_dir_struct es;
struct ext2_inode inode;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
if (!(fs->flags & EXT2_FLAG_RW))
return EXT2_ET_RO_FILSYS;
if (!fs->block_map)
return EXT2_ET_NO_BLOCK_BITMAP;
retval = ext2fs_check_directory(fs, dir);
if (retval)
return retval;
es.done = 0;
es.err = 0;
es.newblocks = 0;
retval = ext2fs_block_iterate2(fs, dir, BLOCK_FLAG_APPEND,
0, expand_dir_proc, &es);
if (es.err)
return es.err;
if (!es.done)
return EXT2_ET_EXPAND_DIR_ERR;
/*
* Update the size and block count fields in the inode.
*/
retval = ext2fs_read_inode(fs, dir, &inode);
if (retval)
return retval;
inode.i_size += fs->blocksize;
inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
retval = ext2fs_write_inode(fs, dir, &inode);
if (retval)
return retval;
return 0;
}
|