2 * dirblock.c --- directory block routines.
4 * Copyright (C) 1995, 1996 Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Public
22 errcode_t ext2fs_read_dir_block3(ext2_filsys fs, blk64_t block,
23 void *buf, int flags EXT2FS_ATTR((unused)))
27 struct ext2_dir_entry *dirent;
28 unsigned int name_len, rec_len;
31 retval = io_channel_read_blk64(fs->io, block, 1, buf);
36 end = (char *) buf + fs->blocksize;
38 dirent = (struct ext2_dir_entry *) p;
39 #ifdef WORDS_BIGENDIAN
40 dirent->inode = ext2fs_swab32(dirent->inode);
41 dirent->rec_len = ext2fs_swab16(dirent->rec_len);
42 dirent->name_len = ext2fs_swab16(dirent->name_len);
44 name_len = dirent->name_len;
45 #ifdef WORDS_BIGENDIAN
46 if (flags & EXT2_DIRBLOCK_V2_STRUCT)
47 dirent->name_len = ext2fs_swab16(dirent->name_len);
49 if ((retval = ext2fs_get_rec_len(fs, dirent, &rec_len)) != 0)
51 if ((rec_len < 8) || (rec_len % 4)) {
53 retval = EXT2_ET_DIR_CORRUPTED;
54 } else if (((name_len & 0xFF) + 8) > rec_len)
55 retval = EXT2_ET_DIR_CORRUPTED;
61 errcode_t ext2fs_read_dir_block2(ext2_filsys fs, blk_t block,
62 void *buf, int flags EXT2FS_ATTR((unused)))
64 return ext2fs_read_dir_block3(fs, block, buf, flags);
67 errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block,
70 return ext2fs_read_dir_block3(fs, block, buf, 0);
74 errcode_t ext2fs_write_dir_block3(ext2_filsys fs, blk64_t block,
75 void *inbuf, int flags EXT2FS_ATTR((unused)))
77 #ifdef WORDS_BIGENDIAN
82 struct ext2_dir_entry *dirent;
84 retval = ext2fs_get_mem(fs->blocksize, &buf);
87 memcpy(buf, inbuf, fs->blocksize);
89 end = buf + fs->blocksize;
91 dirent = (struct ext2_dir_entry *) p;
92 if ((retval = ext2fs_get_rec_len(fs, dirent, &rec_len)) != 0)
96 ext2fs_free_mem(&buf);
97 return (EXT2_ET_DIR_CORRUPTED);
100 dirent->inode = ext2fs_swab32(dirent->inode);
101 dirent->rec_len = ext2fs_swab16(dirent->rec_len);
102 dirent->name_len = ext2fs_swab16(dirent->name_len);
104 if (flags & EXT2_DIRBLOCK_V2_STRUCT)
105 dirent->name_len = ext2fs_swab16(dirent->name_len);
107 retval = io_channel_write_blk64(fs->io, block, 1, buf);
108 ext2fs_free_mem(&buf);
111 return io_channel_write_blk(fs->io, block, 1, (char *) inbuf);
115 errcode_t ext2fs_write_dir_block2(ext2_filsys fs, blk_t block,
116 void *inbuf, int flags EXT2FS_ATTR((unused)))
118 return ext2fs_write_dir_block3(fs, block, inbuf, flags);
121 errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block,
124 return ext2fs_write_dir_block3(fs, block, inbuf, 0);