fs/afs/cell.h

   1 /* cell.h: AFS cell record
   2  *
   3  * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifndef _LINUX_AFS_CELL_H
  13 #define _LINUX_AFS_CELL_H
  14
  15 #include "types.h"
  16
  17 extern volatile int afs_cells_being_purged; /* T when cells are being purged by rmmod */
  18
  19 /*****************************************************************************/
  20 /*
  21  * AFS cell record
  22  */
  23 struct afs_cell
  24 {
  25         atomic_t                usage;
  26         struct list_head        link;           /* main cell list link */
  27         struct list_head        proc_link;      /* /proc cell list link */
  28         struct proc_dir_entry   *proc_dir;      /* /proc dir for this cell */
  29         struct list_head        caches;         /* list of caches currently backing this cell */
  30
  31         /* server record management */
  32         rwlock_t                sv_lock;        /* active server list lock */
  33         struct list_head        sv_list;        /* active server list */
  34         struct list_head        sv_graveyard;   /* inactive server list */
  35         spinlock_t              sv_gylock;      /* inactive server list lock */
  36
  37         /* volume location record management */
  38         struct rw_semaphore     vl_sem;         /* volume management serialisation semaphore */
  39         struct list_head        vl_list;        /* cell's active VL record list */
  40         struct list_head        vl_graveyard;   /* cell's inactive VL record list */
  41         spinlock_t              vl_gylock;      /* graveyard lock */
  42         unsigned short          vl_naddrs;      /* number of VL servers in addr list */
  43         unsigned short          vl_curr_svix;   /* current server index */
  44         struct in_addr          vl_addrs[16];   /* cell VL server addresses */
  45
  46         char                    name[0];        /* cell name - must go last */
  47 };
  48
  49 extern int afs_cell_init(void);
  50
  51 extern int afs_cell_create(const char *name, char *vllist, afs_cell_t **_cell);
  52
  53 extern int afs_cell_lookup(const char *name, afs_cell_t **_cell);
  54
  55 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
  56
  57 extern afs_cell_t *afs_get_cell_maybe(afs_cell_t **_cell);
  58
  59 extern void afs_put_cell(afs_cell_t *cell);
  60
  61 extern void afs_cell_purge(void);
  62
  63 #endif /* _LINUX_AFS_CELL_H */