lib/ext2fs/mkdir.c

   1 /*
   2  * mkdir.c --- make a directory in the filesystem
   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 <stdio.h>
  13 #include <string.h>
  14 #if HAVE_UNISTD_H
  15 #include <unistd.h>
  16 #endif
  17 #include <fcntl.h>
  18 #include <time.h>
  19 #if HAVE_SYS_STAT_H
  20 #include <sys/stat.h>
  21 #endif
  22 #if HAVE_SYS_TYPES_H
  23 #include <sys/types.h>
  24 #endif
  25
  26 #include "ext2_fs.h"
  27 #include "ext2fs.h"
  28
  29 #ifndef EXT2_FT_DIR
  30 #define EXT2_FT_DIR             2
  31 #endif
  32
  33 errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
  34                        const char *name)
  35 {
  36         ext2_extent_handle_t    handle;
  37         errcode_t               retval;
  38         struct ext2_inode       parent_inode, inode;
  39         ext2_ino_t              ino = inum;
  40         ext2_ino_t              scratch_ino;
  41         blk64_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_block2(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         ext2fs_iblk_set(fs, &inode, 1);
  87         if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS)
  88                 inode.i_flags |= EXT4_EXTENTS_FL;
  89         else
  90                 inode.i_block[0] = blk;
  91         inode.i_links_count = 2;
  92         inode.i_size = fs->blocksize;
  93
  94         /*
  95          * Write out the inode and inode data block
  96          */
  97         retval = ext2fs_write_dir_block(fs, blk, block);
  98         if (retval)
  99                 goto cleanup;
 100         retval = ext2fs_write_new_inode(fs, ino, &inode);
 101         if (retval)
 102                 goto cleanup;
 103
 104         if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
 105                 retval = ext2fs_extent_open2(fs, ino, &inode, &handle);
 106                 if (retval)
 107                         goto cleanup;
 108                 retval = ext2fs_extent_set_bmap(handle, 0, blk, 0);
 109                 ext2fs_extent_free(handle);
 110                 if (retval)
 111                         goto cleanup;
 112         }
 113
 114         /*
 115          * Link the directory into the filesystem hierarchy
 116          */
 117         if (name) {
 118                 retval = ext2fs_lookup(fs, parent, name, strlen(name), 0,
 119                                        &scratch_ino);
 120                 if (!retval) {
 121                         retval = EXT2_ET_DIR_EXISTS;
 122                         name = 0;
 123                         goto cleanup;
 124                 }
 125                 if (retval != EXT2_ET_FILE_NOT_FOUND)
 126                         goto cleanup;
 127                 retval = ext2fs_link(fs, parent, name, ino, EXT2_FT_DIR);
 128                 if (retval)
 129                         goto cleanup;
 130         }
 131
 132         /*
 133          * Update parent inode's counts
 134          */
 135         if (parent != ino) {
 136                 parent_inode.i_links_count++;
 137                 retval = ext2fs_write_inode(fs, parent, &parent_inode);
 138                 if (retval)
 139                         goto cleanup;
 140         }
 141
 142         /*
 143          * Update accounting....
 144          */
 145         ext2fs_block_alloc_stats2(fs, blk, +1);
 146         ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
 147
 148 cleanup:
 149         if (block)
 150                 ext2fs_free_mem(&block);
 151         return retval;
 152
 153 }
 154
 155