Gitiles
Code Review Sign In
gerrit.nordix.org / codeaurora / busybox / e1a0d486e4804eae098571f1a6788394c2ee51ae / . / e2fsprogs / ext2fs / expanddir.c
blob: 8a29ae5849e4774c03db434f86de6273565aa45e [file] [log] [blame]
"Robert P. J. Day"63fc1a92006-07-02 19:47:05 +0000[diff] [blame]1/* vi: set sw=4 ts=4: */
Mike Frysinger1fd98e02005-05-09 22:10:42 +0000[diff] [blame]2/*
3 * expand.c --- expand an ext2fs directory
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000[diff] [blame]4 *
Mike Frysinger1fd98e02005-05-09 22:10:42 +0000[diff] [blame]5 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o.
6 *
7 * %Begin-Header%
8 * This file may be redistributed under the terms of the GNU Public
9 * License.
10 * %End-Header%
11 */
12
13#include <stdio.h>
14#include <string.h>
15#if HAVE_UNISTD_H
16#include <unistd.h>
17#endif
18
19#include "ext2_fs.h"
20#include "ext2fs.h"
21
22struct expand_dir_struct {
23 int done;
24 int newblocks;
25 errcode_t err;
26};
27
28static int expand_dir_proc(ext2_filsys fs,
29 blk_t *blocknr,
30 e2_blkcnt_t blockcnt,
31 blk_t ref_block EXT2FS_ATTR((unused)),
32 int ref_offset EXT2FS_ATTR((unused)),
33 void *priv_data)
34{
35 struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
36 blk_t new_blk;
37 static blk_t last_blk = 0;
38 char *block;
39 errcode_t retval;
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000[diff] [blame]40
Mike Frysinger1fd98e02005-05-09 22:10:42 +0000[diff] [blame]41 if (*blocknr) {
42 last_blk = *blocknr;
43 return 0;
44 }
45 retval = ext2fs_new_block(fs, last_blk, 0, &new_blk);
46 if (retval) {
47 es->err = retval;
48 return BLOCK_ABORT;
49 }
50 if (blockcnt > 0) {
51 retval = ext2fs_new_dir_block(fs, 0, 0, &block);
52 if (retval) {
53 es->err = retval;
54 return BLOCK_ABORT;
55 }
56 es->done = 1;
57 retval = ext2fs_write_dir_block(fs, new_blk, block);
58 } else {
59 retval = ext2fs_get_mem(fs->blocksize, &block);
60 if (retval) {
61 es->err = retval;
62 return BLOCK_ABORT;
63 }
64 memset(block, 0, fs->blocksize);
65 retval = io_channel_write_blk(fs->io, new_blk, 1, block);
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000[diff] [blame]66 }
Mike Frysinger1fd98e02005-05-09 22:10:42 +0000[diff] [blame]67 if (retval) {
68 es->err = retval;
69 return BLOCK_ABORT;
70 }
71 ext2fs_free_mem(&block);
72 *blocknr = new_blk;
73 ext2fs_block_alloc_stats(fs, new_blk, +1);
74 es->newblocks++;
75
76 if (es->done)
77 return (BLOCK_CHANGED | BLOCK_ABORT);
78 else
79 return BLOCK_CHANGED;
80}
81
82errcode_t ext2fs_expand_dir(ext2_filsys fs, ext2_ino_t dir)
83{
84 errcode_t retval;
85 struct expand_dir_struct es;
86 struct ext2_inode inode;
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000[diff] [blame]87
Mike Frysinger1fd98e02005-05-09 22:10:42 +0000[diff] [blame]88 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
89
90 if (!(fs->flags & EXT2_FLAG_RW))
91 return EXT2_ET_RO_FILSYS;
92
93 if (!fs->block_map)
94 return EXT2_ET_NO_BLOCK_BITMAP;
95
96 retval = ext2fs_check_directory(fs, dir);
97 if (retval)
98 return retval;
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000[diff] [blame]99
Mike Frysinger1fd98e02005-05-09 22:10:42 +0000[diff] [blame]100 es.done = 0;
101 es.err = 0;
102 es.newblocks = 0;
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000[diff] [blame]103
Mike Frysinger1fd98e02005-05-09 22:10:42 +0000[diff] [blame]104 retval = ext2fs_block_iterate2(fs, dir, BLOCK_FLAG_APPEND,
105 0, expand_dir_proc, &es);
106
107 if (es.err)
108 return es.err;
109 if (!es.done)
110 return EXT2_ET_EXPAND_DIR_ERR;
111
112 /*
113 * Update the size and block count fields in the inode.
114 */
115 retval = ext2fs_read_inode(fs, dir, &inode);
116 if (retval)
117 return retval;
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000[diff] [blame]118
Mike Frysinger1fd98e02005-05-09 22:10:42 +0000[diff] [blame]119 inode.i_size += fs->blocksize;
120 inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
121
122 retval = ext2fs_write_inode(fs, dir, &inode);
123 if (retval)
124 return retval;
125
126 return 0;
127}