minix/lib/libvtreefs/path.c

   1 /* VTreeFS - path.c - name resolution */
   2
   3 #include "inc.h"
   4
   5 /*
   6  * Resolve a path string to an inode.
   7  */
   8 int
   9 fs_lookup(ino_t dir_nr, char * name, struct fsdriver_node * node_details,
  10         int * is_mountpt)
  11 {
  12         struct inode *node, *child;
  13         int r;
  14
  15         if ((node = find_inode(dir_nr)) == NULL)
  16                 return EINVAL;
  17
  18         if (!S_ISDIR(node->i_stat.mode))
  19                 return ENOTDIR;
  20
  21         if (strlen(name) > NAME_MAX)
  22                 return ENAMETOOLONG;
  23
  24         if (!strcmp(name, ".")) {
  25                 /* Stay in the given directory. */
  26                 child = node;
  27         } else if (!strcmp(name, "..")) {
  28                 /* Progress into the parent directory. */
  29                 if ((child = get_parent_inode(node)) == NULL)
  30                         return ENOENT;  /* deleted? should not be possible */
  31         } else {
  32                 /* Progress into a directory entry.  Call the lookup hook, if
  33                  * present, before doing the actual lookup.
  34                  */
  35                 if (!is_inode_deleted(node) &&
  36                     vtreefs_hooks->lookup_hook != NULL) {
  37                         r = vtreefs_hooks->lookup_hook(node, name,
  38                             get_inode_cbdata(node));
  39                         if (r != OK) return r;
  40                 }
  41
  42                 if ((child = get_inode_by_name(node, name)) == NULL)
  43                         return ENOENT;
  44         }
  45
  46         /* On success, open the resulting file and return its details. */
  47         ref_inode(child);
  48
  49         node_details->fn_ino_nr = get_inode_number(child);
  50         node_details->fn_mode = child->i_stat.mode;
  51         node_details->fn_size = child->i_stat.size;
  52         node_details->fn_uid = child->i_stat.uid;
  53         node_details->fn_gid = child->i_stat.gid;
  54         node_details->fn_dev = child->i_stat.dev;
  55
  56         *is_mountpt = FALSE;
  57
  58         return OK;
  59 }