release/src/router/busybox/e2fsprogs/ext2fs/mkdir.c

   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 = NULL;
  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 }