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1 | /* volume.h: AFS volume management |
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_VOLUME_H | |
13 | #define _LINUX_AFS_VOLUME_H | |
14 | ||
15 | #include "types.h" | |
16 | #include "fsclient.h" | |
17 | #include "kafstimod.h" | |
18 | #include "kafsasyncd.h" | |
19 | #include "cache.h" | |
20 | ||
1da177e4 LT |
21 | typedef enum { |
22 | AFS_VLUPD_SLEEP, /* sleeping waiting for update timer to fire */ | |
23 | AFS_VLUPD_PENDING, /* on pending queue */ | |
24 | AFS_VLUPD_INPROGRESS, /* op in progress */ | |
25 | AFS_VLUPD_BUSYSLEEP, /* sleeping because server returned EBUSY */ | |
26 | ||
27 | } __attribute__((packed)) afs_vlocation_upd_t; | |
28 | ||
29 | /*****************************************************************************/ | |
30 | /* | |
31 | * entry in the cached volume location catalogue | |
32 | */ | |
33 | struct afs_cache_vlocation | |
34 | { | |
35 | uint8_t name[64]; /* volume name (lowercase, padded with NULs) */ | |
36 | uint8_t nservers; /* number of entries used in servers[] */ | |
37 | uint8_t vidmask; /* voltype mask for vid[] */ | |
38 | uint8_t srvtmask[8]; /* voltype masks for servers[] */ | |
39 | #define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */ | |
40 | #define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */ | |
41 | #define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */ | |
42 | ||
43 | afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */ | |
44 | struct in_addr servers[8]; /* fileserver addresses */ | |
45 | time_t rtime; /* last retrieval time */ | |
46 | }; | |
47 | ||
48 | #ifdef AFS_CACHING_SUPPORT | |
49 | extern struct cachefs_index_def afs_vlocation_cache_index_def; | |
50 | #endif | |
51 | ||
52 | /*****************************************************************************/ | |
53 | /* | |
54 | * volume -> vnode hash table entry | |
55 | */ | |
56 | struct afs_cache_vhash | |
57 | { | |
58 | afs_voltype_t vtype; /* which volume variation */ | |
59 | uint8_t hash_bucket; /* which hash bucket this represents */ | |
60 | } __attribute__((packed)); | |
61 | ||
62 | #ifdef AFS_CACHING_SUPPORT | |
63 | extern struct cachefs_index_def afs_volume_cache_index_def; | |
64 | #endif | |
65 | ||
66 | /*****************************************************************************/ | |
67 | /* | |
68 | * AFS volume location record | |
69 | */ | |
70 | struct afs_vlocation | |
71 | { | |
72 | atomic_t usage; | |
73 | struct list_head link; /* link in cell volume location list */ | |
74 | struct afs_timer timeout; /* decaching timer */ | |
75 | struct afs_cell *cell; /* cell to which volume belongs */ | |
76 | #ifdef AFS_CACHING_SUPPORT | |
77 | struct cachefs_cookie *cache; /* caching cookie */ | |
78 | #endif | |
79 | struct afs_cache_vlocation vldb; /* volume information DB record */ | |
80 | struct afs_volume *vols[3]; /* volume access record pointer (index by type) */ | |
81 | rwlock_t lock; /* access lock */ | |
82 | unsigned long read_jif; /* time at which last read from vlserver */ | |
83 | struct afs_timer upd_timer; /* update timer */ | |
84 | struct afs_async_op upd_op; /* update operation */ | |
85 | afs_vlocation_upd_t upd_state; /* update state */ | |
86 | unsigned short upd_first_svix; /* first server index during update */ | |
87 | unsigned short upd_curr_svix; /* current server index during update */ | |
88 | unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */ | |
89 | unsigned short upd_busy_cnt; /* EBUSY count during update */ | |
90 | unsigned short valid; /* T if valid */ | |
91 | }; | |
92 | ||
93 | extern int afs_vlocation_lookup(struct afs_cell *cell, | |
94 | const char *name, | |
95 | unsigned namesz, | |
96 | struct afs_vlocation **_vlocation); | |
97 | ||
98 | #define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0) | |
99 | ||
100 | extern void afs_put_vlocation(struct afs_vlocation *vlocation); | |
101 | extern void afs_vlocation_do_timeout(struct afs_vlocation *vlocation); | |
102 | ||
103 | /*****************************************************************************/ | |
104 | /* | |
105 | * AFS volume access record | |
106 | */ | |
107 | struct afs_volume | |
108 | { | |
109 | atomic_t usage; | |
110 | struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */ | |
111 | struct afs_vlocation *vlocation; /* volume location */ | |
112 | #ifdef AFS_CACHING_SUPPORT | |
113 | struct cachefs_cookie *cache; /* caching cookie */ | |
114 | #endif | |
115 | afs_volid_t vid; /* volume ID */ | |
bfc090c4 | 116 | afs_voltype_t type; /* type of volume */ |
1da177e4 LT |
117 | char type_force; /* force volume type (suppress R/O -> R/W) */ |
118 | unsigned short nservers; /* number of server slots filled */ | |
119 | unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */ | |
120 | struct afs_server *servers[8]; /* servers on which volume resides (ordered) */ | |
121 | struct rw_semaphore server_sem; /* lock for accessing current server */ | |
122 | }; | |
123 | ||
124 | extern int afs_volume_lookup(const char *name, | |
125 | struct afs_cell *cell, | |
126 | int rwpath, | |
127 | struct afs_volume **_volume); | |
128 | ||
129 | #define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0) | |
130 | ||
131 | extern void afs_put_volume(struct afs_volume *volume); | |
132 | ||
133 | extern int afs_volume_pick_fileserver(struct afs_volume *volume, | |
134 | struct afs_server **_server); | |
135 | ||
136 | extern int afs_volume_release_fileserver(struct afs_volume *volume, | |
137 | struct afs_server *server, | |
138 | int result); | |
139 | ||
140 | #endif /* _LINUX_AFS_VOLUME_H */ |