fs/ext2/dir.c

   1 /*
   2  * thunix/fs/dir.c
   3  *
   4  * implement something relations to dir, like
   5  * mkdir, rmdir or cd some of sort ...
   6  *
   7  * Copyright (C) 2008 - 2009 Aleaxander
   8  *
   9  *           Aleaxander@gmail.com
  10  */
  11
  12 #include <string.h>
  13 #include <thunix.h>
  14 #include <fs_ext2.h>
  15
  16
  17 void ext2_make_empty_dir(struct m_inode *dir, struct m_inode *parent)
  18 {
  19         int block;
  20
  21         block = create_block(dir, 0);
  22         struct ext2_dir_entry dot, ddot;
  23
  24         dot.inode = dir->i_num;
  25         dot.name_len = 1;
  26         dot.rec_len = EXT2_DIR_REC_LEN(1);
  27         strcpy(dot.name, ".");
  28
  29         ddot.inode = parent->i_num;
  30         ddot.name_len = 2;
  31         ddot.rec_len = EXT2_DIR_REC_LEN(2);
  32         strcpy(ddot.name, "..");
  33
  34         ext2_add_entry(dir, &dot);
  35         ext2_add_entry(dir, &ddot);
  36 }
  37
  38 int  ext2_dir_empty(struct m_inode *dir)
  39 {
  40         void *dir_data;
  41         struct ext2_dir_entry *de;
  42         unsigned int block;
  43         unsigned int dir_block = 1;
  44         int i = 0;
  45
  46         EXT2_DEBUG();
  47
  48         if ( !(block = dir->inode.i_block[0]) )
  49                 return 2;
  50
  51         dir_data = bread(block);
  52         de = (struct ext2_dir_entry *)dir_data;
  53         while (1) {
  54                 if ( (char *)de >= (char *)(EXT2_BLOCK_SIZE + dir_data) ) {
  55                         block = bmap (dir, dir_block);
  56                         dir_data = bread (block);
  57                         de = (struct ext2_dir_entry *)dir_data;
  58                         dir_block ++;
  59                 }
  60
  61                 if (strcmp(de->name, ".") || strcmp(de->inode, "..") )
  62                         return 0;
  63                 i ++;
  64                 if ( i > 2)
  65                         return 1;
  66
  67                 de = ext2_next_entry(de);
  68         }
  69 }
  70
  71 void mkdir(char *pathname)
  72 {
  73         struct m_inode *dir, *inode;
  74         int mode;
  75         char *dir_name, *file_name;
  76         struct ext2_dir_entry entry;
  77
  78         char temp_dir[8] = "/";
  79
  80
  81         /**
  82          * for now, we just one levele dir like /xx but not /xx/yy.
  83          * and for now, it's enough
  84          */
  85
  86         dir_name = pathname;
  87         file_name = strchr(pathname,'/');
  88         if (! file_name) {
  89                 printk("error: please input the absolute pathname\n");
  90                 return ;
  91         }
  92
  93         *file_name = '\0';
  94         file_name ++;
  95
  96         EXT2_DEBUG(printk("dir:%s file: %s\n",dir_name, file_name));
  97
  98         dir = ext2_namei(temp_dir);
  99
 100         EXT2_DEBUG(printk("dir's inr: %d\n", dir->i_num));
 101
 102         mode = mode | S_IFDIR;
 103         inode  = ext2_new_inode(dir, mode);
 104
 105
 106         entry.inode = inode->i_num;
 107         entry.name_len = strlen(file_name);
 108         entry.rec_len = EXT2_DIR_REC_LEN(entry.name_len);
 109         strcpy(entry.name, file_name);
 110
 111         EXT2_DEBUG(printk("the new entry's name is %s\n",entry.name));
 112
 113         ext2_add_entry(dir, &entry);
 114
 115
 116
 117         ext2_make_empty_dir(inode, dir);
 118 }
 119
 120 void rmdir(struct m_inode *dir)
 121 {
 122         if ( !ext2_dir_empty(dir) ) {
 123                 printk("dir not empty\n");
 124                 return;
 125         }
 126
 127         ext2_iput(dir);
 128 }
 129