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https://github.com/torvalds/linux
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79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
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/* cell.h: AFS cell record
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*
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_AFS_CELL_H
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#define _LINUX_AFS_CELL_H
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#include "types.h"
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#include "cache.h"
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#define AFS_CELL_MAX_ADDRS 15
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extern volatile int afs_cells_being_purged; /* T when cells are being purged by rmmod */
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/*****************************************************************************/
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/*
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* entry in the cached cell catalogue
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*/
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struct afs_cache_cell
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{
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char name[64]; /* cell name (padded with NULs) */
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struct in_addr vl_servers[15]; /* cached cell VL servers */
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};
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/*****************************************************************************/
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/*
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* AFS cell record
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*/
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struct afs_cell
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{
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atomic_t usage;
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struct list_head link; /* main cell list link */
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struct list_head proc_link; /* /proc cell list link */
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struct proc_dir_entry *proc_dir; /* /proc dir for this cell */
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#ifdef AFS_CACHING_SUPPORT
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struct cachefs_cookie *cache; /* caching cookie */
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#endif
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/* server record management */
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rwlock_t sv_lock; /* active server list lock */
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struct list_head sv_list; /* active server list */
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struct list_head sv_graveyard; /* inactive server list */
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spinlock_t sv_gylock; /* inactive server list lock */
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/* volume location record management */
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struct rw_semaphore vl_sem; /* volume management serialisation semaphore */
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struct list_head vl_list; /* cell's active VL record list */
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struct list_head vl_graveyard; /* cell's inactive VL record list */
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spinlock_t vl_gylock; /* graveyard lock */
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unsigned short vl_naddrs; /* number of VL servers in addr list */
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unsigned short vl_curr_svix; /* current server index */
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struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */
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char name[0]; /* cell name - must go last */
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};
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extern int afs_cell_init(char *rootcell);
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extern int afs_cell_create(const char *name, char *vllist, struct afs_cell **_cell);
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extern int afs_cell_lookup(const char *name, unsigned nmsize, struct afs_cell **_cell);
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#define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
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extern struct afs_cell *afs_get_cell_maybe(struct afs_cell **_cell);
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extern void afs_put_cell(struct afs_cell *cell);
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extern void afs_cell_purge(void);
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#endif /* _LINUX_AFS_CELL_H */
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