143 lines
5.0 KiB
C
143 lines
5.0 KiB
C
/* volume.h: AFS volume management
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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_VOLUME_H
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#define _LINUX_AFS_VOLUME_H
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#include "types.h"
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#include "fsclient.h"
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#include "kafstimod.h"
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#include "kafsasyncd.h"
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#include "cache.h"
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#define __packed __attribute__((packed))
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typedef enum {
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AFS_VLUPD_SLEEP, /* sleeping waiting for update timer to fire */
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AFS_VLUPD_PENDING, /* on pending queue */
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AFS_VLUPD_INPROGRESS, /* op in progress */
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AFS_VLUPD_BUSYSLEEP, /* sleeping because server returned EBUSY */
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} __attribute__((packed)) afs_vlocation_upd_t;
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/*****************************************************************************/
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/*
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* entry in the cached volume location catalogue
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*/
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struct afs_cache_vlocation
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{
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uint8_t name[64]; /* volume name (lowercase, padded with NULs) */
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uint8_t nservers; /* number of entries used in servers[] */
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uint8_t vidmask; /* voltype mask for vid[] */
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uint8_t srvtmask[8]; /* voltype masks for servers[] */
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#define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
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#define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
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#define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
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afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */
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struct in_addr servers[8]; /* fileserver addresses */
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time_t rtime; /* last retrieval time */
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};
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#ifdef AFS_CACHING_SUPPORT
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extern struct cachefs_index_def afs_vlocation_cache_index_def;
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#endif
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/*****************************************************************************/
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/*
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* volume -> vnode hash table entry
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*/
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struct afs_cache_vhash
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{
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afs_voltype_t vtype; /* which volume variation */
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uint8_t hash_bucket; /* which hash bucket this represents */
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} __attribute__((packed));
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#ifdef AFS_CACHING_SUPPORT
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extern struct cachefs_index_def afs_volume_cache_index_def;
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#endif
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/*****************************************************************************/
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/*
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* AFS volume location record
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*/
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struct afs_vlocation
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{
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atomic_t usage;
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struct list_head link; /* link in cell volume location list */
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struct afs_timer timeout; /* decaching timer */
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struct afs_cell *cell; /* cell to which volume belongs */
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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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struct afs_cache_vlocation vldb; /* volume information DB record */
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struct afs_volume *vols[3]; /* volume access record pointer (index by type) */
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rwlock_t lock; /* access lock */
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unsigned long read_jif; /* time at which last read from vlserver */
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struct afs_timer upd_timer; /* update timer */
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struct afs_async_op upd_op; /* update operation */
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afs_vlocation_upd_t upd_state; /* update state */
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unsigned short upd_first_svix; /* first server index during update */
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unsigned short upd_curr_svix; /* current server index during update */
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unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */
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unsigned short upd_busy_cnt; /* EBUSY count during update */
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unsigned short valid; /* T if valid */
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};
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extern int afs_vlocation_lookup(struct afs_cell *cell,
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const char *name,
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unsigned namesz,
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struct afs_vlocation **_vlocation);
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#define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
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extern void afs_put_vlocation(struct afs_vlocation *vlocation);
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extern void afs_vlocation_do_timeout(struct afs_vlocation *vlocation);
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/*****************************************************************************/
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/*
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* AFS volume access record
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*/
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struct afs_volume
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{
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atomic_t usage;
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struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */
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struct afs_vlocation *vlocation; /* volume location */
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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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afs_volid_t vid; /* volume ID */
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afs_voltype_t __packed type; /* type of volume */
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char type_force; /* force volume type (suppress R/O -> R/W) */
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unsigned short nservers; /* number of server slots filled */
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unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */
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struct afs_server *servers[8]; /* servers on which volume resides (ordered) */
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struct rw_semaphore server_sem; /* lock for accessing current server */
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};
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extern int afs_volume_lookup(const char *name,
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struct afs_cell *cell,
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int rwpath,
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struct afs_volume **_volume);
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#define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
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extern void afs_put_volume(struct afs_volume *volume);
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extern int afs_volume_pick_fileserver(struct afs_volume *volume,
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struct afs_server **_server);
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extern int afs_volume_release_fileserver(struct afs_volume *volume,
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struct afs_server *server,
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int result);
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#endif /* _LINUX_AFS_VOLUME_H */
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