lib/libsffs/handle.c

   1 /* This file contains open file and directory handle management functions.
   2  *
   3  * The entry points into this file are:
   4  *   get_handle         open a handle for an inode and store the handle
   5  *   put_handle         close any handles associated with an inode
   6  *
   7  * Created:
   8  *   April 2009 (D.C. van Moolenbroek)
   9  */
  10
  11 #include "inc.h"
  12
  13 #include <fcntl.h>
  14
  15 /*===========================================================================*
  16  *                              get_handle                                   *
  17  *===========================================================================*/
  18 int get_handle(ino)
  19 struct inode *ino;
  20 {
  21 /* Get an open file or directory handle for an inode.
  22  */
  23   char path[PATH_MAX];
  24   int r;
  25
  26   /* If we don't have a file handle yet, try to open the file now. */
  27   if (ino->i_flags & I_HANDLE)
  28         return OK;
  29
  30   if ((r = verify_inode(ino, path, NULL)) != OK)
  31         return r;
  32
  33   if (IS_DIR(ino)) {
  34         r = sffs_table->t_opendir(path, &ino->i_dir);
  35   }
  36   else {
  37         if (!state.s_read_only)
  38                 r = sffs_table->t_open(path, O_RDWR, 0, &ino->i_file);
  39
  40         /* Protection or mount status might prevent us from writing. With the
  41          * information that we have available, this is the best we can do..
  42          */
  43         if (state.s_read_only || r != OK)
  44                 r = sffs_table->t_open(path, O_RDONLY, 0, &ino->i_file);
  45   }
  46
  47   if (r != OK)
  48         return r;
  49
  50   ino->i_flags |= I_HANDLE;
  51
  52   return OK;
  53 }
  54
  55 /*===========================================================================*
  56  *                              put_handle                                   *
  57  *===========================================================================*/
  58 void put_handle(ino)
  59 struct inode *ino;
  60 {
  61 /* Close an open file or directory handle associated with an inode.
  62  */
  63   int r;
  64
  65   if (!(ino->i_flags & I_HANDLE))
  66         return;
  67
  68   /* We ignore any errors here, because we can't deal with them anyway. */
  69   if (IS_DIR(ino))
  70         r = sffs_table->t_closedir(ino->i_dir);
  71   else
  72         r = sffs_table->t_close(ino->i_file);
  73
  74   if (r != OK)
  75         printf("%s: put_handle: handle close operation returned %d\n",
  76                 sffs_name, r);
  77
  78   ino->i_flags &= ~I_HANDLE;
  79 }