| Denis Vlasenko | c4f623e | 2006-12-26 01:30:59 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * mkdir.c --- make a directory in the filesystem |
| 4 | * |
| 5 | * Copyright (C) 1994, 1995 Theodore Ts'o. |
| 6 | * |
| 7 | * %Begin-Header% |
| 8 | * This file may be redistributed under the terms of the GNU Public |
| 9 | * License. |
| 10 | * %End-Header% |
| 11 | */ |
| 12 | |
| 13 | #include <stdio.h> |
| 14 | #include <string.h> |
| 15 | #if HAVE_UNISTD_H |
| 16 | #include <unistd.h> |
| 17 | #endif |
| 18 | #include <fcntl.h> |
| 19 | #include <time.h> |
| 20 | #if HAVE_SYS_STAT_H |
| 21 | #include <sys/stat.h> |
| 22 | #endif |
| 23 | #if HAVE_SYS_TYPES_H |
| 24 | #include <sys/types.h> |
| 25 | #endif |
| 26 | |
| 27 | #include "ext2_fs.h" |
| 28 | #include "ext2fs.h" |
| 29 | |
| 30 | #ifndef EXT2_FT_DIR |
| 31 | #define EXT2_FT_DIR 2 |
| 32 | #endif |
| 33 | |
| 34 | errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum, |
| 35 | const char *name) |
| 36 | { |
| 37 | errcode_t retval; |
| 38 | struct ext2_inode parent_inode, inode; |
| 39 | ext2_ino_t ino = inum; |
| 40 | ext2_ino_t scratch_ino; |
| 41 | blk_t blk; |
| 42 | char *block = 0; |
| 43 | |
| 44 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
| 45 | |
| 46 | /* |
| 47 | * Allocate an inode, if necessary |
| 48 | */ |
| 49 | if (!ino) { |
| 50 | retval = ext2fs_new_inode(fs, parent, LINUX_S_IFDIR | 0755, |
| 51 | 0, &ino); |
| 52 | if (retval) |
| 53 | goto cleanup; |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * Allocate a data block for the directory |
| 58 | */ |
| 59 | retval = ext2fs_new_block(fs, 0, 0, &blk); |
| 60 | if (retval) |
| 61 | goto cleanup; |
| 62 | |
| 63 | /* |
| 64 | * Create a scratch template for the directory |
| 65 | */ |
| 66 | retval = ext2fs_new_dir_block(fs, ino, parent, &block); |
| 67 | if (retval) |
| 68 | goto cleanup; |
| 69 | |
| 70 | /* |
| 71 | * Get the parent's inode, if necessary |
| 72 | */ |
| 73 | if (parent != ino) { |
| 74 | retval = ext2fs_read_inode(fs, parent, &parent_inode); |
| 75 | if (retval) |
| 76 | goto cleanup; |
| 77 | } else |
| 78 | memset(&parent_inode, 0, sizeof(parent_inode)); |
| 79 | |
| 80 | /* |
| 81 | * Create the inode structure.... |
| 82 | */ |
| 83 | memset(&inode, 0, sizeof(struct ext2_inode)); |
| 84 | inode.i_mode = LINUX_S_IFDIR | (0777 & ~fs->umask); |
| 85 | inode.i_uid = inode.i_gid = 0; |
| 86 | inode.i_blocks = fs->blocksize / 512; |
| 87 | inode.i_block[0] = blk; |
| 88 | inode.i_links_count = 2; |
| 89 | inode.i_ctime = inode.i_atime = inode.i_mtime = time(NULL); |
| 90 | inode.i_size = fs->blocksize; |
| 91 | |
| 92 | /* |
| 93 | * Write out the inode and inode data block |
| 94 | */ |
| 95 | retval = ext2fs_write_dir_block(fs, blk, block); |
| 96 | if (retval) |
| 97 | goto cleanup; |
| 98 | retval = ext2fs_write_new_inode(fs, ino, &inode); |
| 99 | if (retval) |
| 100 | goto cleanup; |
| 101 | |
| 102 | /* |
| 103 | * Link the directory into the filesystem hierarchy |
| 104 | */ |
| 105 | if (name) { |
| 106 | retval = ext2fs_lookup(fs, parent, name, strlen(name), 0, |
| 107 | &scratch_ino); |
| 108 | if (!retval) { |
| 109 | retval = EXT2_ET_DIR_EXISTS; |
| 110 | name = 0; |
| 111 | goto cleanup; |
| 112 | } |
| 113 | if (retval != EXT2_ET_FILE_NOT_FOUND) |
| 114 | goto cleanup; |
| 115 | retval = ext2fs_link(fs, parent, name, ino, EXT2_FT_DIR); |
| 116 | if (retval) |
| 117 | goto cleanup; |
| 118 | } |
| 119 | |
| 120 | /* |
| 121 | * Update parent inode's counts |
| 122 | */ |
| 123 | if (parent != ino) { |
| 124 | parent_inode.i_links_count++; |
| 125 | retval = ext2fs_write_inode(fs, parent, &parent_inode); |
| 126 | if (retval) |
| 127 | goto cleanup; |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * Update accounting.... |
| 132 | */ |
| 133 | ext2fs_block_alloc_stats(fs, blk, +1); |
| 134 | ext2fs_inode_alloc_stats2(fs, ino, +1, 1); |
| 135 | |
| 136 | cleanup: |
| 137 | ext2fs_free_mem(&block); |
| 138 | return retval; |
| 139 | |
| 140 | } |
| 141 | |
| 142 | |