minix/fs/isofs/path.c

   1 #include "inc.h"
   2
   3 static int search_dir(
   4         struct inode *ldir_ptr,                 /* dir record parent */
   5         char string[NAME_MAX],                  /* component to search for */
   6         ino_t *numb                             /* pointer to new dir record */
   7 ) {
   8         /*
   9          * The search_dir function performs the operation of searching for the
  10          * component ``string" in ldir_ptr. It returns the response and the
  11          * number of the inode in numb.
  12          */
  13         int r, i;
  14
  15         /*
  16          * This function search a particular element (in string) in a inode and
  17          * return its number.
  18          */
  19
  20         if ((ldir_ptr->i_stat.st_mode & S_IFMT) != S_IFDIR)
  21                 return ENOTDIR;
  22
  23         r = read_directory(ldir_ptr);
  24         if (r != OK)
  25                 return r;
  26
  27         if (strcmp(".", string) == 0) {
  28                 *numb = ldir_ptr->i_stat.st_ino;
  29                 return OK;
  30         }
  31
  32         /* Walk the directory listing. */
  33         for (i = 0; i < ldir_ptr->dir_size; i++) {
  34                 if (strcmp(string, ldir_ptr->dir_contents[i].name) == 0) {
  35                         *numb = ldir_ptr->dir_contents[i].i_node->i_stat.st_ino;
  36                         return OK;
  37                 }
  38         }
  39
  40         return ENOENT;
  41 }
  42
  43 int fs_lookup(ino_t dir_nr, char *name, struct fsdriver_node *node,
  44         int *is_mountpt)
  45 {
  46         /* Given a directory and a component of a path, look up the component
  47          * in the directory, find the inode, open it, and return its details.
  48          */
  49         struct inode *dirp, *rip;
  50         ino_t ino_nr;
  51         int r;
  52
  53         /* Find the starting inode. */
  54         if ((dirp = get_inode(dir_nr)) == NULL)
  55                 return EINVAL;
  56
  57         /* Look up the directory entry. */
  58         if ((r = search_dir(dirp, name, &ino_nr)) != OK)
  59                 return r;
  60
  61         /* The component has been found in the directory.  Get the inode. */
  62         if ((rip = open_inode(ino_nr)) == NULL)
  63                 return EIO;     /* FIXME: this could have multiple causes */
  64
  65         /* Return its details to the caller. */
  66         node->fn_ino_nr = rip->i_stat.st_ino;
  67         node->fn_mode   = rip->i_stat.st_mode;
  68         node->fn_size   = rip->i_stat.st_size;
  69         node->fn_uid    = rip->i_stat.st_uid;
  70         node->fn_gid    = rip->i_stat.st_gid;
  71         node->fn_dev    = rip->i_stat.st_rdev;
  72
  73         *is_mountpt = rip->i_mountpoint;
  74
  75         return OK;
  76 }