| Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 1 | /* |
| 2 | * mkdir.c --- make a directory in the filesystem |
| 3 | * |
| 4 | * Copyright (C) 1994 Theodore Ts'o. This file may be redistributed |
| 5 | * under the terms of the GNU Public License. |
| 6 | */ |
| 7 | |
| 8 | #include <stdio.h> |
| 9 | #include <string.h> |
| 10 | #include <unistd.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <fcntl.h> |
| 13 | #include <time.h> |
| 14 | #include <sys/stat.h> |
| 15 | #include <sys/types.h> |
| 16 | |
| 17 | #include <linux/fs.h> |
| 18 | #include <linux/ext2_fs.h> |
| 19 | |
| 20 | #include "ext2fs.h" |
| 21 | |
| 22 | errcode_t ext2fs_mkdir(ext2_filsys fs, ino_t parent, ino_t inum, |
| 23 | const char *name) |
| 24 | { |
| 25 | errcode_t retval; |
| 26 | struct ext2_inode inode; |
| 27 | ino_t ino = inum; |
| 28 | ino_t scratch_ino; |
| 29 | blk_t blk; |
| 30 | char *block = 0; |
| 31 | int group; |
| 32 | |
| 33 | /* |
| 34 | * Allocate an inode, if necessary |
| 35 | */ |
| 36 | if (!ino) { |
| 37 | retval = ext2fs_new_inode(fs, parent, S_IFDIR | 0755, 0, &ino); |
| 38 | if (retval) |
| 39 | goto cleanup; |
| 40 | } |
| 41 | |
| 42 | /* |
| 43 | * Allocate a data block for the directory |
| 44 | */ |
| 45 | retval = ext2fs_new_block(fs, 0, 0, &blk); |
| 46 | if (retval) |
| 47 | goto cleanup; |
| 48 | |
| 49 | /* |
| 50 | * Create a scratch template for the directory |
| 51 | */ |
| 52 | retval = ext2fs_new_dir_block(fs, ino, parent, &block); |
| 53 | if (retval) |
| 54 | goto cleanup; |
| 55 | |
| 56 | /* |
| 57 | * Create the inode structure.... |
| 58 | */ |
| 59 | memset(&inode, 0, sizeof(struct ext2_inode)); |
| 60 | inode.i_mode = S_IFDIR | 0755; |
| 61 | inode.i_uid = inode.i_gid = 0; |
| 62 | inode.i_blocks = fs->blocksize / 512; |
| 63 | inode.i_block[0] = blk; |
| 64 | inode.i_links_count = 2; |
| 65 | inode.i_ctime = inode.i_atime = inode.i_mtime = time(NULL); |
| 66 | inode.i_size = fs->blocksize; |
| 67 | |
| 68 | /* |
| 69 | * Write out the inode and inode data block |
| 70 | */ |
| 71 | retval = io_channel_write_blk(fs->io, blk, 1, block); |
| 72 | if (retval) |
| 73 | goto cleanup; |
| 74 | retval = ext2fs_write_inode(fs, ino, &inode); |
| 75 | if (retval) |
| 76 | goto cleanup; |
| 77 | |
| 78 | /* |
| 79 | * Update parent inode's counts |
| 80 | */ |
| 81 | if (parent != ino) { |
| 82 | retval = ext2fs_read_inode(fs, parent, &inode); |
| 83 | if (retval) |
| 84 | goto cleanup; |
| 85 | inode.i_links_count++; |
| 86 | retval = ext2fs_write_inode(fs, parent, &inode); |
| 87 | if (retval) |
| 88 | goto cleanup; |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * Link the directory into the filesystem hierarchy |
| 93 | */ |
| 94 | if (name) { |
| 95 | retval = ext2fs_lookup(fs, parent, name, strlen(name), 0, |
| 96 | &scratch_ino); |
| 97 | if (!retval) { |
| 98 | retval = EEXIST; |
| 99 | name = 0; |
| 100 | goto cleanup; |
| 101 | } |
| 102 | if (retval != ENOENT) |
| 103 | goto cleanup; |
| 104 | retval = ext2fs_link(fs, parent, name, ino, 0); |
| 105 | if (retval) |
| 106 | goto cleanup; |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * Update accounting.... |
| 111 | */ |
| 112 | ext2fs_mark_block_bitmap(fs, fs->block_map, blk); |
| 113 | ext2fs_mark_bb_dirty(fs); |
| 114 | ext2fs_mark_inode_bitmap(fs, fs->inode_map, ino); |
| 115 | ext2fs_mark_ib_dirty(fs); |
| 116 | |
| 117 | group = ext2fs_group_of_blk(fs, blk); |
| 118 | fs->group_desc[group].bg_free_blocks_count--; |
| 119 | group = ext2fs_group_of_ino(fs, ino); |
| 120 | fs->group_desc[group].bg_free_inodes_count--; |
| 121 | fs->group_desc[group].bg_used_dirs_count++; |
| 122 | fs->super->s_free_blocks_count--; |
| 123 | fs->super->s_free_inodes_count--; |
| 124 | ext2fs_mark_super_dirty(fs); |
| 125 | |
| 126 | cleanup: |
| 127 | if (block) |
| 128 | free(block); |
| 129 | return retval; |
| 130 | |
| 131 | } |
| 132 | |
| 133 | |