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 Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12 #include "config.h"
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 #include "ext2fsP.h"
22
23 struct expand_dir_struct {
24 int done;
25 int newblocks;
26 blk64_t goal;
27 errcode_t err;
28 ext2_ino_t dir;
29 };
30
expand_dir_proc(ext2_filsys fs,blk64_t * blocknr,e2_blkcnt_t blockcnt,blk64_t ref_block EXT2FS_ATTR ((unused)),int ref_offset EXT2FS_ATTR ((unused)),void * priv_data)31 static int expand_dir_proc(ext2_filsys fs,
32 blk64_t *blocknr,
33 e2_blkcnt_t blockcnt,
34 blk64_t ref_block EXT2FS_ATTR((unused)),
35 int ref_offset EXT2FS_ATTR((unused)),
36 void *priv_data)
37 {
38 struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data;
39 blk64_t new_blk;
40 char *block;
41 errcode_t retval;
42
43 if (*blocknr) {
44 if (blockcnt >= 0)
45 es->goal = *blocknr;
46 return 0;
47 }
48 if (blockcnt &&
49 (EXT2FS_B2C(fs, es->goal) == EXT2FS_B2C(fs, es->goal+1)))
50 new_blk = es->goal+1;
51 else {
52 es->goal &= ~EXT2FS_CLUSTER_MASK(fs);
53 retval = ext2fs_new_block2(fs, es->goal, 0, &new_blk);
54 if (retval) {
55 es->err = retval;
56 return BLOCK_ABORT;
57 }
58 es->newblocks++;
59 ext2fs_block_alloc_stats2(fs, new_blk, +1);
60 }
61 if (blockcnt > 0) {
62 retval = ext2fs_new_dir_block(fs, 0, 0, &block);
63 if (retval) {
64 es->err = retval;
65 return BLOCK_ABORT;
66 }
67 es->done = 1;
68 retval = ext2fs_write_dir_block4(fs, new_blk, block, 0,
69 es->dir);
70 ext2fs_free_mem(&block);
71 } else
72 retval = ext2fs_zero_blocks2(fs, new_blk, 1, NULL, NULL);
73 if (blockcnt >= 0)
74 es->goal = new_blk;
75 if (retval) {
76 es->err = retval;
77 return BLOCK_ABORT;
78 }
79 *blocknr = new_blk;
80
81 if (es->done)
82 return (BLOCK_CHANGED | BLOCK_ABORT);
83 else
84 return BLOCK_CHANGED;
85 }
86
ext2fs_expand_dir(ext2_filsys fs,ext2_ino_t dir)87 errcode_t ext2fs_expand_dir(ext2_filsys fs, ext2_ino_t dir)
88 {
89 errcode_t retval;
90 struct expand_dir_struct es;
91 struct ext2_inode inode;
92
93 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
94
95 if (!(fs->flags & EXT2_FLAG_RW))
96 return EXT2_ET_RO_FILSYS;
97
98 if (!fs->block_map)
99 return EXT2_ET_NO_BLOCK_BITMAP;
100
101 retval = ext2fs_check_directory(fs, dir);
102 if (retval)
103 return retval;
104
105 retval = ext2fs_read_inode(fs, dir, &inode);
106 if (retval)
107 return retval;
108
109 es.done = 0;
110 es.err = 0;
111 es.goal = ext2fs_find_inode_goal(fs, dir, &inode, 0);
112 es.newblocks = 0;
113 es.dir = dir;
114
115 retval = ext2fs_block_iterate3(fs, dir, BLOCK_FLAG_APPEND,
116 0, expand_dir_proc, &es);
117 if (retval == EXT2_ET_INLINE_DATA_CANT_ITERATE)
118 return ext2fs_inline_data_expand(fs, dir);
119
120 if (es.err)
121 return es.err;
122 if (!es.done)
123 return EXT2_ET_EXPAND_DIR_ERR;
124
125 /*
126 * Update the size and block count fields in the inode.
127 */
128 retval = ext2fs_read_inode(fs, dir, &inode);
129 if (retval)
130 return retval;
131
132 inode.i_size += fs->blocksize;
133 ext2fs_iblk_add_blocks(fs, &inode, es.newblocks);
134
135 retval = ext2fs_write_inode(fs, dir, &inode);
136 if (retval)
137 return retval;
138
139 return 0;
140 }
141