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805e021f CE |
1 | /* |
2 | * Copyright 2000, International Business Machines Corporation and others. | |
3 | * All Rights Reserved. | |
4 | * | |
5 | * This software has been released under the terms of the IBM Public | |
6 | * License. For details, see the LICENSE file in the top-level source | |
7 | * directory or online at http://www.openafs.org/dl/license10.html | |
8 | */ | |
9 | ||
10 | #include <afsconfig.h> | |
11 | #include "afs/param.h" | |
12 | ||
13 | ||
14 | #include "afs/sysincludes.h" /* Standard vendor system headers */ | |
15 | #include "afsincludes.h" /* Afs-based standard headers */ | |
16 | #include "afs/afs_stats.h" /* statistics gathering code */ | |
17 | ||
18 | struct afs_exporter *root_exported = 0; /* Head of "exporters" link list */ | |
19 | afs_lock_t afs_xexp; | |
20 | ||
21 | ||
22 | /* Add a new "afs exporter" entry to the table of exporters. The default initial values of the entry are passed in as parameters. */ | |
23 | static afs_int32 init_xexported = 0; | |
24 | ||
25 | struct afs_exporter * | |
26 | exporter_add(afs_int32 size, struct exporterops *ops, afs_int32 state, | |
27 | afs_int32 type, char *data) | |
28 | { | |
29 | struct afs_exporter *ex, *op; | |
30 | afs_int32 length; | |
31 | ||
32 | AFS_STATCNT(exporter_add); | |
33 | if (!init_xexported) { | |
34 | init_xexported = 1; | |
35 | LOCK_INIT(&afs_xexp, "afs_xexp"); | |
36 | } | |
37 | length = (size ? size : sizeof(struct afs_exporter)); | |
38 | ex = afs_osi_Alloc(length); | |
39 | osi_Assert(ex != NULL); | |
40 | memset(ex, 0, length); | |
41 | ObtainWriteLock(&afs_xexp, 308); | |
42 | for (op = root_exported; op; op = op->exp_next) { | |
43 | if (!op->exp_next) | |
44 | break; | |
45 | } | |
46 | if (op) | |
47 | op->exp_next = ex; | |
48 | else | |
49 | root_exported = ex; | |
50 | ReleaseWriteLock(&afs_xexp); | |
51 | ex->exp_next = 0; | |
52 | ex->exp_op = ops; | |
53 | ex->exp_states = state; | |
54 | ex->exp_data = data; | |
55 | ex->exp_type = type; | |
56 | return ex; | |
57 | } | |
58 | ||
59 | ||
60 | /* Returns the "afs exporter" structure of type, "type". NULL is returned if not found */ | |
61 | struct afs_exporter * | |
62 | exporter_find(int type) | |
63 | { | |
64 | struct afs_exporter *op; | |
65 | ||
66 | AFS_STATCNT(exporter_add); | |
67 | ObtainReadLock(&afs_xexp); | |
68 | for (op = root_exported; op; op = op->exp_next) { | |
69 | if (op->exp_type == type) { | |
70 | ReleaseReadLock(&afs_xexp); | |
71 | return op; | |
72 | } | |
73 | } | |
74 | ReleaseReadLock(&afs_xexp); | |
75 | return (struct afs_exporter *)0; | |
76 | } | |
77 | ||
78 | ||
79 | void | |
80 | shutdown_exporter(void) | |
81 | { | |
82 | struct afs_exporter *ex, *op; | |
83 | ||
84 | for (op = root_exported; op; op = ex) { | |
85 | ex = op->exp_next; | |
86 | afs_osi_Free(op, sizeof(struct afs_exporter)); | |
87 | } | |
88 | init_xexported = 0; | |
89 | } |