src/afs/afs_exporter.c

   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 }