| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | * newdir.c --- create a new directory block |
| 3 | * |
| 4 | * Copyright (C) 1994, 1995 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 | |
| 22 | #ifndef EXT2_FT_DIR |
| 23 | #define EXT2_FT_DIR 2 |
| 24 | #endif |
| 25 | |
| 26 | /* |
| 27 | * Create new directory block |
| 28 | */ |
| 29 | errcode_t ext2fs_new_dir_block(ext2_filsys fs, ext2_ino_t dir_ino, |
| 30 | ext2_ino_t parent_ino, char **block) |
| 31 | { |
| 32 | struct ext2_dir_entry *dir = NULL; |
| 33 | errcode_t retval; |
| 34 | char *buf; |
| 35 | int rec_len; |
| 36 | int filetype = 0; |
| 37 | |
| 38 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
| 39 | |
| 40 | retval = ext2fs_get_mem(fs->blocksize, &buf); |
| 41 | if (retval) |
| 42 | return retval; |
| 43 | memset(buf, 0, fs->blocksize); |
| 44 | dir = (struct ext2_dir_entry *) buf; |
| 45 | |
| 46 | retval = ext2fs_set_rec_len(fs, fs->blocksize, dir); |
| 47 | if (retval) { |
| 48 | ext2fs_free_mem(&buf); |
| 49 | return retval; |
| 50 | } |
| 51 | |
| 52 | if (dir_ino) { |
| 53 | if (fs->super->s_feature_incompat & |
| 54 | EXT2_FEATURE_INCOMPAT_FILETYPE) |
| 55 | filetype = EXT2_FT_DIR << 8; |
| 56 | /* |
| 57 | * Set up entry for '.' |
| 58 | */ |
| 59 | dir->inode = dir_ino; |
| 60 | dir->name_len = 1 | filetype; |
| 61 | dir->name[0] = '.'; |
| 62 | rec_len = fs->blocksize - EXT2_DIR_REC_LEN(1); |
| 63 | dir->rec_len = EXT2_DIR_REC_LEN(1); |
| 64 | |
| 65 | /* |
| 66 | * Set up entry for '..' |
| 67 | */ |
| 68 | dir = (struct ext2_dir_entry *) (buf + dir->rec_len); |
| 69 | retval = ext2fs_set_rec_len(fs, rec_len, dir); |
| 70 | if (retval) { |
| 71 | ext2fs_free_mem(&buf); |
| 72 | return retval; |
| 73 | } |
| 74 | dir->inode = parent_ino; |
| 75 | dir->name_len = 2 | filetype; |
| 76 | dir->name[0] = '.'; |
| 77 | dir->name[1] = '.'; |
| 78 | |
| 79 | } |
| 80 | *block = buf; |
| 81 | return 0; |
| 82 | } |