src/volser/voltrans.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 /*
  11  *  Module:         Voltrans.c
  12  *  System:         Volser
  13  *  Instituition:           ITC, CMU
  14  *  Date:                   December, 88
  15  */
  16
  17 #include <afsconfig.h>
  18 #include <afs/param.h>
  19
  20
  21 #ifdef AFS_NT40_ENV
  22 #include <afs/afsutil.h>
  23 #else
  24 #include <sys/time.h>
  25 #endif
  26
  27 #include <stdio.h>
  28 #include <sys/types.h>
  29 #include <errno.h>
  30 #include <string.h>
  31 #ifdef AFS_NT40_ENV
  32 #include <fcntl.h>
  33 #include <winsock2.h>
  34 #else
  35 #include <sys/file.h>
  36 #include <netinet/in.h>
  37 #include <unistd.h>
  38 #endif
  39 #include <dirent.h>
  40 #include <sys/stat.h>
  41 #include <afs/afsint.h>
  42 #include <signal.h>
  43 #include <afs/afs_assert.h>
  44 #include <afs/prs_fs.h>
  45 #include <afs/nfs.h>
  46 #include <lwp.h>
  47 #include <lock.h>
  48 #include <afs/cellconfig.h>
  49 #include <afs/keys.h>
  50 #include <rx/rx.h>
  51 #include <ubik.h>
  52 #include <afs/ihandle.h>
  53 #ifdef AFS_NT40_ENV
  54 #include <afs/ntops.h>
  55 #endif
  56 #include <afs/vnode.h>
  57 #include <afs/volume.h>
  58
  59 #include "volint.h"
  60 #include "volser.h"
  61 #include "volser_internal.h"
  62
  63 static struct volser_trans *allTrans = 0;
  64 static afs_int32 transCounter = 1;
  65
  66 /* create a new transaction, returning ptr to same with high ref count */
  67 struct volser_trans *
  68 NewTrans(afs_uint32 avol, afs_int32 apart)
  69 {
  70     /* set volid, next, partition */
  71     struct volser_trans *tt, *newtt;
  72     struct timeval tp;
  73     struct timezone tzp;
  74
  75     newtt = (struct volser_trans *)malloc(sizeof(struct volser_trans));
  76     VTRANS_LOCK;
  77     /* don't allow the same volume to be attached twice */
  78     for (tt = allTrans; tt; tt = tt->next) {
  79         if ((tt->volid == avol) && (tt->partition == apart)) {
  80             VTRANS_UNLOCK;
  81             free(newtt);
  82             return (struct volser_trans *)0;    /* volume busy */
  83         }
  84     }
  85     tt = newtt;
  86     memset(tt, 0, sizeof(struct volser_trans));
  87     tt->volid = avol;
  88     tt->partition = apart;
  89     tt->refCount = 1;
  90     tt->rxCallPtr = (struct rx_call *)0;
  91     strcpy(tt->lastProcName, "");
  92     gettimeofday(&tp, &tzp);
  93     tt->creationTime = tp.tv_sec;
  94     tt->time = FT_ApproxTime();
  95     tt->tid = transCounter++;
  96     tt->next = allTrans;
  97     VTRANS_OBJ_LOCK_INIT(tt);
  98     allTrans = tt;
  99     VTRANS_UNLOCK;
 100     return tt;
 101 }
 102
 103 /* find a trans, again returning with high ref count */
 104 struct volser_trans *
 105 FindTrans(afs_int32 atrans)
 106 {
 107     struct volser_trans *tt;
 108     VTRANS_LOCK;
 109     for (tt = allTrans; tt; tt = tt->next) {
 110         if (tt->tid == atrans) {
 111             tt->time = FT_ApproxTime();
 112             tt->refCount++;
 113             VTRANS_UNLOCK;
 114             return tt;
 115         }
 116     }
 117     VTRANS_UNLOCK;
 118     return (struct volser_trans *)0;
 119 }
 120
 121 /* delete transaction if refcount == 1, otherwise queue delete for later.  Does implicit TRELE */
 122 afs_int32
 123 DeleteTrans(struct volser_trans *atrans, afs_int32 lock)
 124 {
 125     struct volser_trans *tt, **lt;
 126     Error error;
 127
 128     if (lock) VTRANS_LOCK;
 129     if (atrans->refCount > 1) {
 130         /* someone else is using it now */
 131         atrans->refCount--;
 132         atrans->tflags |= TTDeleted;
 133         if (lock) VTRANS_UNLOCK;
 134         return 0;
 135     }
 136
 137     /* otherwise we zap it ourselves */
 138     lt = &allTrans;
 139     for (tt = *lt; tt; lt = &tt->next, tt = *lt) {
 140         if (tt == atrans) {
 141             if (tt->volume)
 142                 VDetachVolume(&error, tt->volume);
 143             tt->volume = NULL;
 144             if (tt->rxCallPtr)
 145                 rxi_CallError(tt->rxCallPtr, RX_CALL_DEAD);
 146             *lt = tt->next;
 147             VTRANS_OBJ_LOCK_DESTROY(tt);
 148             free(tt);
 149             if (lock) VTRANS_UNLOCK;
 150             return 0;
 151         }
 152     }
 153     if (lock) VTRANS_UNLOCK;
 154     return -1;                  /* failed to find the transaction in the generic list */
 155 }
 156
 157 /* THOLD is a macro defined in volser.h */
 158
 159 /* put a transaction back */
 160 afs_int32
 161 TRELE(struct volser_trans *at)
 162 {
 163     VTRANS_LOCK;
 164     if (at->refCount == 0) {
 165         Log("TRELE: bad refcount\n");
 166         VTRANS_UNLOCK;
 167         return VOLSERTRELE_ERROR;
 168     }
 169
 170     at->time = FT_ApproxTime(); /* we're still using it */
 171     if (at->refCount == 1 && (at->tflags & TTDeleted)) {
 172         DeleteTrans(at, 0);
 173         VTRANS_UNLOCK;
 174         return 0;
 175     }
 176     /* otherwise simply drop refcount */
 177     at->refCount--;
 178     VTRANS_UNLOCK;
 179     return 0;
 180 }
 181
 182 /* look for old transactions and delete them */
 183 #define OLDTRANSTIME        600 /* seconds */
 184 #define OLDTRANSWARN        300 /* seconds */
 185 static int GCDeletes = 0;
 186 afs_int32
 187 GCTrans(void)
 188 {
 189     struct volser_trans *tt, *nt;
 190     afs_int32 now;
 191
 192     now = FT_ApproxTime();
 193
 194     VTRANS_LOCK;
 195     for (tt = allTrans; tt; tt = nt) {
 196         nt = tt->next;          /* remember in case we zap it */
 197         if (tt->time + OLDTRANSWARN < now) {
 198             Log("trans %u on volume %u %s than %d seconds\n", tt->tid,
 199                 tt->volid,
 200                 ((tt->refCount > 0) ? "is older" : "has been idle for more"),
 201                 (((now - tt->time) / GCWAKEUP) * GCWAKEUP));
 202         }
 203         if (tt->refCount > 0)
 204             continue;
 205         if (tt->time + OLDTRANSTIME < now) {
 206             Log("trans %u on volume %u has timed out\n", tt->tid, tt->volid);
 207
 208             tt->refCount++;     /* we're using it now */
 209
 210             if (tt->volume && V_destroyMe(tt->volume) == DESTROY_ME
 211                 && !(tt->vflags & VTDeleted)) {
 212
 213                 Error error;
 214
 215                 Log("Deleting timed-out temporary volume %lu\n",
 216                     (long unsigned) tt->volid);
 217
 218                 VTRANS_OBJ_LOCK(tt);
 219                 tt->vflags |= VTDeleted;
 220                 VTRANS_OBJ_UNLOCK(tt);
 221
 222                 VTRANS_UNLOCK;
 223                 VPurgeVolume(&error, tt->volume);
 224                 VTRANS_LOCK;
 225             }
 226
 227             DeleteTrans(tt, 0); /* drops refCount or deletes it */
 228             GCDeletes++;
 229         }
 230     }
 231     VTRANS_UNLOCK;
 232     return 0;
 233 }
 234
 235 /*return the head of the transaction list */
 236 struct volser_trans *
 237 TransList(void)
 238 {
 239     return (allTrans);
 240 }