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