blob: 8a29ae5849e4774c03db434f86de6273565aa45e
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * expand.c --- expand an ext2fs directory |
4 | * |
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 | |
22 | struct expand_dir_struct { |
23 | int done; |
24 | int newblocks; |
25 | errcode_t err; |
26 | }; |
27 | |
28 | static 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; |
40 | |
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); |
66 | } |
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 | |
82 | errcode_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; |
87 | |
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; |
99 | |
100 | es.done = 0; |
101 | es.err = 0; |
102 | es.newblocks = 0; |
103 | |
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; |
118 | |
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 | } |
128 |