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3839e657 TT |
1 | /* |
2 | * expand.c --- expand an ext2fs directory | |
3 | * | |
4 | * Copyright (C) 1993 Theodore Ts'o. This file may be redistributed | |
5 | * under the terms of the GNU Public License. | |
6 | */ | |
7 | ||
8 | #include <stdio.h> | |
9 | #include <string.h> | |
10 | #include <unistd.h> | |
11 | #include <stdlib.h> | |
12 | #include <linux/fs.h> | |
13 | #include <linux/ext2_fs.h> | |
14 | ||
15 | #include "ext2fs.h" | |
16 | ||
17 | struct expand_dir_struct { | |
18 | int done; | |
19 | errcode_t err; | |
20 | }; | |
21 | ||
22 | static int expand_dir_proc(ext2_filsys fs, | |
23 | blk_t *blocknr, | |
24 | int blockcnt, | |
25 | void *private) | |
26 | { | |
27 | struct expand_dir_struct *es = (struct expand_dir_struct *) private; | |
28 | blk_t new_blk; | |
29 | static blk_t last_blk = 0; | |
30 | char *block; | |
31 | errcode_t retval; | |
32 | int group; | |
33 | ||
34 | if (*blocknr) { | |
35 | last_blk = *blocknr; | |
36 | return 0; | |
37 | } | |
38 | retval = ext2fs_new_block(fs, last_blk, 0, &new_blk); | |
39 | if (retval) { | |
40 | es->err = retval; | |
41 | return BLOCK_ABORT; | |
42 | } | |
43 | if (blockcnt > 0) { | |
44 | retval = ext2fs_new_dir_block(fs, 0, 0, &block); | |
45 | if (retval) { | |
46 | es->err = retval; | |
47 | return BLOCK_ABORT; | |
48 | } | |
49 | es->done = 1; | |
50 | } else { | |
51 | block = malloc(fs->blocksize); | |
52 | if (!block) { | |
53 | es->err = ENOMEM; | |
54 | return BLOCK_ABORT; | |
55 | } | |
56 | memset(block, 0, fs->blocksize); | |
57 | } | |
58 | retval = io_channel_write_blk(fs->io, new_blk, 1, block); | |
59 | if (retval) { | |
60 | es->err = retval; | |
61 | return BLOCK_ABORT; | |
62 | } | |
63 | free(block); | |
64 | *blocknr = new_blk; | |
65 | ext2fs_mark_block_bitmap(fs, fs->block_map, new_blk); | |
66 | ext2fs_mark_bb_dirty(fs); | |
67 | group = ext2fs_group_of_blk(fs, new_blk); | |
68 | fs->group_desc[group].bg_free_blocks_count--; | |
69 | fs->super->s_free_blocks_count--; | |
70 | ext2fs_mark_super_dirty(fs); | |
71 | if (es->done) | |
72 | return (BLOCK_CHANGED | BLOCK_ABORT); | |
73 | else | |
74 | return BLOCK_CHANGED; | |
75 | } | |
76 | ||
77 | errcode_t ext2fs_expand_dir(ext2_filsys fs, ino_t dir) | |
78 | { | |
79 | errcode_t retval; | |
80 | struct expand_dir_struct es; | |
81 | struct ext2_inode inode; | |
82 | ||
83 | if (!(fs->flags & EXT2_FLAG_RW)) | |
84 | return EXT2_ET_RO_FILSYS; | |
85 | ||
86 | retval = ext2fs_check_directory(fs, dir); | |
87 | if (retval) | |
88 | return retval; | |
89 | ||
90 | es.done = 0; | |
91 | es.err = 0; | |
92 | ||
93 | retval = ext2fs_block_iterate(fs, dir, BLOCK_FLAG_APPEND, | |
94 | 0, expand_dir_proc, &es); | |
95 | ||
96 | if (es.err) | |
97 | return es.err; | |
98 | if (!es.done) | |
99 | return EXT2_ET_EXPAND_DIR_ERR; | |
100 | ||
101 | /* | |
102 | * Update the size and block count fields in the inode. | |
103 | */ | |
104 | retval = ext2fs_read_inode(fs, dir, &inode); | |
105 | if (retval) | |
106 | return retval; | |
107 | ||
108 | inode.i_size += fs->blocksize; | |
109 | inode.i_blocks += fs->blocksize / 512; | |
110 | ||
111 | retval = ext2fs_write_inode(fs, dir, &inode); | |
112 | if (retval) | |
113 | return retval; | |
114 | ||
115 | return 0; | |
116 | } |