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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | /* volume.h: AFS volume management * * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _LINUX_AFS_VOLUME_H #define _LINUX_AFS_VOLUME_H #include "types.h" #include "fsclient.h" #include "kafstimod.h" #include "kafsasyncd.h" #include "cache.h" #define __packed __attribute__((packed)) typedef enum { AFS_VLUPD_SLEEP, /* sleeping waiting for update timer to fire */ AFS_VLUPD_PENDING, /* on pending queue */ AFS_VLUPD_INPROGRESS, /* op in progress */ AFS_VLUPD_BUSYSLEEP, /* sleeping because server returned EBUSY */ } __attribute__((packed)) afs_vlocation_upd_t; /*****************************************************************************/ /* * entry in the cached volume location catalogue */ struct afs_cache_vlocation { uint8_t name[64]; /* volume name (lowercase, padded with NULs) */ uint8_t nservers; /* number of entries used in servers[] */ uint8_t vidmask; /* voltype mask for vid[] */ uint8_t srvtmask[8]; /* voltype masks for servers[] */ #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */ struct in_addr servers[8]; /* fileserver addresses */ time_t rtime; /* last retrieval time */ }; #ifdef AFS_CACHING_SUPPORT extern struct cachefs_index_def afs_vlocation_cache_index_def; #endif /*****************************************************************************/ /* * volume -> vnode hash table entry */ struct afs_cache_vhash { afs_voltype_t vtype; /* which volume variation */ uint8_t hash_bucket; /* which hash bucket this represents */ } __attribute__((packed)); #ifdef AFS_CACHING_SUPPORT extern struct cachefs_index_def afs_volume_cache_index_def; #endif /*****************************************************************************/ /* * AFS volume location record */ struct afs_vlocation { atomic_t usage; struct list_head link; /* link in cell volume location list */ struct afs_timer timeout; /* decaching timer */ struct afs_cell *cell; /* cell to which volume belongs */ #ifdef AFS_CACHING_SUPPORT struct cachefs_cookie *cache; /* caching cookie */ #endif struct afs_cache_vlocation vldb; /* volume information DB record */ struct afs_volume *vols[3]; /* volume access record pointer (index by type) */ rwlock_t lock; /* access lock */ unsigned long read_jif; /* time at which last read from vlserver */ struct afs_timer upd_timer; /* update timer */ struct afs_async_op upd_op; /* update operation */ afs_vlocation_upd_t upd_state; /* update state */ unsigned short upd_first_svix; /* first server index during update */ unsigned short upd_curr_svix; /* current server index during update */ unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */ unsigned short upd_busy_cnt; /* EBUSY count during update */ unsigned short valid; /* T if valid */ }; extern int afs_vlocation_lookup(struct afs_cell *cell, const char *name, unsigned namesz, struct afs_vlocation **_vlocation); #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0) extern void afs_put_vlocation(struct afs_vlocation *vlocation); extern void afs_vlocation_do_timeout(struct afs_vlocation *vlocation); /*****************************************************************************/ /* * AFS volume access record */ struct afs_volume { atomic_t usage; struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */ struct afs_vlocation *vlocation; /* volume location */ #ifdef AFS_CACHING_SUPPORT struct cachefs_cookie *cache; /* caching cookie */ #endif afs_volid_t vid; /* volume ID */ afs_voltype_t __packed type; /* type of volume */ char type_force; /* force volume type (suppress R/O -> R/W) */ unsigned short nservers; /* number of server slots filled */ unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */ struct afs_server *servers[8]; /* servers on which volume resides (ordered) */ struct rw_semaphore server_sem; /* lock for accessing current server */ }; extern int afs_volume_lookup(const char *name, struct afs_cell *cell, int rwpath, struct afs_volume **_volume); #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0) extern void afs_put_volume(struct afs_volume *volume); extern int afs_volume_pick_fileserver(struct afs_volume *volume, struct afs_server **_server); extern int afs_volume_release_fileserver(struct afs_volume *volume, struct afs_server *server, int result); #endif /* _LINUX_AFS_VOLUME_H */ |