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 Library
8 * General Public License, version 2.
22 errcode_t ext2fs_read_dir_block2(ext2_filsys fs, blk_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_blk(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_block(ext2_filsys fs, blk_t block,
64 return ext2fs_read_dir_block2(fs, block, buf, 0);
68 errcode_t ext2fs_write_dir_block2(ext2_filsys fs, blk_t block,
69 void *inbuf, int flags EXT2FS_ATTR((unused)))
71 #ifdef WORDS_BIGENDIAN
76 struct ext2_dir_entry *dirent;
78 retval = ext2fs_get_mem(fs->blocksize, &buf);
81 memcpy(buf, inbuf, fs->blocksize);
83 end = buf + fs->blocksize;
85 dirent = (struct ext2_dir_entry *) p;
86 if ((retval = ext2fs_get_rec_len(fs, dirent, &rec_len)) != 0)
90 ext2fs_free_mem(&buf);
91 return (EXT2_ET_DIR_CORRUPTED);
94 dirent->inode = ext2fs_swab32(dirent->inode);
95 dirent->rec_len = ext2fs_swab16(dirent->rec_len);
96 dirent->name_len = ext2fs_swab16(dirent->name_len);
98 if (flags & EXT2_DIRBLOCK_V2_STRUCT)
99 dirent->name_len = ext2fs_swab16(dirent->name_len);
101 retval = io_channel_write_blk(fs->io, block, 1, buf);
102 ext2fs_free_mem(&buf);
105 return io_channel_write_blk(fs->io, block, 1, (char *) inbuf);
110 errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block,
113 return ext2fs_write_dir_block2(fs, block, inbuf, 0);