external/gpl2/lvm2/dist/include/dev-cache.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   5  * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
   6  *
   7  * This file is part of LVM2.
   8  *
   9  * This copyrighted material is made available to anyone wishing to use,
  10  * modify, copy, or redistribute it subject to the terms and conditions
  11  * of the GNU Lesser General Public License v.2.1.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #ifndef _LVM_DEV_CACHE_H
  19 #define _LVM_DEV_CACHE_H
  20
  21 #include "device.h"
  22
  23 /*
  24  * predicate for devices.
  25  */
  26 struct dev_filter {
  27         int (*passes_filter) (struct dev_filter * f, struct device * dev);
  28         void (*destroy) (struct dev_filter * f);
  29         void *private;
  30 };
  31
  32 /*
  33  * The global device cache.
  34  */
  35 struct cmd_context;
  36 int dev_cache_init(struct cmd_context *cmd);
  37 void dev_cache_exit(void);
  38
  39 /* Trigger(1) or avoid(0) a scan */
  40 void dev_cache_scan(int do_scan);
  41 int dev_cache_has_scanned(void);
  42
  43 int dev_cache_add_dir(const char *path);
  44 int dev_cache_add_loopfile(const char *path);
  45 struct device *dev_cache_get(const char *name, struct dev_filter *f);
  46
  47 void dev_set_preferred_name(struct str_list *sl, struct device *dev);
  48
  49 /*
  50  * Object for iterating through the cache.
  51  */
  52 struct dev_iter;
  53 struct dev_iter *dev_iter_create(struct dev_filter *f, int dev_scan);
  54 void dev_iter_destroy(struct dev_iter *iter);
  55 struct device *dev_iter_get(struct dev_iter *iter);
  56
  57 #endif