source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/ext2fs/expanddir.c@ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 18 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)
File size: 2.5 KB
RevLine 
[821]1/*
2 * expand.c --- expand an ext2fs directory
3 *
4 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13#include <string.h>
14#if HAVE_UNISTD_H
15#include <unistd.h>
16#endif
17
18#include "ext2_fs.h"
19#include "ext2fs.h"
20
21struct expand_dir_struct {
22 int done;
23 int newblocks;
24 errcode_t err;
25};
26
27static int expand_dir_proc(ext2_filsys fs,
28 blk_t *blocknr,
29 e2_blkcnt_t blockcnt,
30 blk_t ref_block EXT2FS_ATTR((unused)),
31 int ref_offset EXT2FS_ATTR((unused)),
32 void *priv_data)
33{
34 struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
35 blk_t new_blk;
36 static blk_t last_blk = 0;
37 char *block;
38 errcode_t retval;
39
40 if (*blocknr) {
41 last_blk = *blocknr;
42 return 0;
43 }
44 retval = ext2fs_new_block(fs, last_blk, 0, &new_blk);
45 if (retval) {
46 es->err = retval;
47 return BLOCK_ABORT;
48 }
49 if (blockcnt > 0) {
50 retval = ext2fs_new_dir_block(fs, 0, 0, &block);
51 if (retval) {
52 es->err = retval;
53 return BLOCK_ABORT;
54 }
55 es->done = 1;
56 retval = ext2fs_write_dir_block(fs, new_blk, block);
57 } else {
58 retval = ext2fs_get_mem(fs->blocksize, &block);
59 if (retval) {
60 es->err = retval;
61 return BLOCK_ABORT;
62 }
63 memset(block, 0, fs->blocksize);
64 retval = io_channel_write_blk(fs->io, new_blk, 1, block);
65 }
66 if (retval) {
67 es->err = retval;
68 return BLOCK_ABORT;
69 }
70 ext2fs_free_mem(&block);
71 *blocknr = new_blk;
72 ext2fs_block_alloc_stats(fs, new_blk, +1);
73 es->newblocks++;
74
75 if (es->done)
76 return (BLOCK_CHANGED | BLOCK_ABORT);
77 else
78 return BLOCK_CHANGED;
79}
80
81errcode_t ext2fs_expand_dir(ext2_filsys fs, ext2_ino_t dir)
82{
83 errcode_t retval;
84 struct expand_dir_struct es;
85 struct ext2_inode inode;
86
87 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
88
89 if (!(fs->flags & EXT2_FLAG_RW))
90 return EXT2_ET_RO_FILSYS;
91
92 if (!fs->block_map)
93 return EXT2_ET_NO_BLOCK_BITMAP;
94
95 retval = ext2fs_check_directory(fs, dir);
96 if (retval)
97 return retval;
98
99 es.done = 0;
100 es.err = 0;
101 es.newblocks = 0;
102
103 retval = ext2fs_block_iterate2(fs, dir, BLOCK_FLAG_APPEND,
104 0, expand_dir_proc, &es);
105
106 if (es.err)
107 return es.err;
108 if (!es.done)
109 return EXT2_ET_EXPAND_DIR_ERR;
110
111 /*
112 * Update the size and block count fields in the inode.
113 */
114 retval = ext2fs_read_inode(fs, dir, &inode);
115 if (retval)
116 return retval;
117
118 inode.i_size += fs->blocksize;
119 inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
120
121 retval = ext2fs_write_inode(fs, dir, &inode);
122 if (retval)
123 return retval;
124
125 return 0;
126}
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