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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