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 #include "cache.h"
  17
  18 #define AFS_CELL_MAX_ADDRS 15
  19
  20 extern volatile int afs_cells_being_purged; /* T when cells are being purged by rmmod */
  21
  22 /*****************************************************************************/
  23 /*
  24  * entry in the cached cell catalogue
  25  */
  26 struct afs_cache_cell
  27 {
  28         char                    name[64];       /* cell name (padded with NULs) */
  29         struct in_addr          vl_servers[15]; /* cached cell VL servers */
  30 };
  31
  32 /*****************************************************************************/
  33 /*
  34  * AFS cell record
  35  */
  36 struct afs_cell
  37 {
  38         atomic_t                usage;
  39         struct list_head        link;           /* main cell list link */
  40         struct list_head        proc_link;      /* /proc cell list link */
  41         struct proc_dir_entry   *proc_dir;      /* /proc dir for this cell */
  42 #ifdef AFS_CACHING_SUPPORT
  43         struct cachefs_cookie   *cache;         /* caching cookie */
  44 #endif
  45
  46         /* server record management */
  47         rwlock_t                sv_lock;        /* active server list lock */
  48         struct list_head        sv_list;        /* active server list */
  49         struct list_head        sv_graveyard;   /* inactive server list */
  50         spinlock_t              sv_gylock;      /* inactive server list lock */
  51
  52         /* volume location record management */
  53         struct rw_semaphore     vl_sem;         /* volume management serialisation semaphore */
  54         struct list_head        vl_list;        /* cell's active VL record list */
  55         struct list_head        vl_graveyard;   /* cell's inactive VL record list */
  56         spinlock_t              vl_gylock;      /* graveyard lock */
  57         unsigned short          vl_naddrs;      /* number of VL servers in addr list */
  58         unsigned short          vl_curr_svix;   /* current server index */
  59         struct in_addr          vl_addrs[AFS_CELL_MAX_ADDRS];   /* cell VL server addresses */
  60
  61         char                    name[0];        /* cell name - must go last */
  62 };
  63
  64 extern int afs_cell_init(char *rootcell);
  65
  66 extern int afs_cell_create(const char *name, char *vllist, struct afs_cell **_cell);
  67
  68 extern int afs_cell_lookup(const char *name, unsigned nmsize, struct afs_cell **_cell);
  69
  70 #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
  71
  72 extern struct afs_cell *afs_get_cell_maybe(struct afs_cell **_cell);
  73
  74 extern void afs_put_cell(struct afs_cell *cell);
  75
  76 extern void afs_cell_purge(void);
  77
  78 #endif /* _LINUX_AFS_CELL_H */