src/vol/purge.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         System:         VICE-TWO
  12         Module:         purge.c
  13         Institution:    The Information Technology Center, Carnegie-Mellon University
  14
  15  */
  16 #include <afsconfig.h>
  17 #include <afs/param.h>
  18
  19 #include <roken.h>
  20
  21 #ifdef HAVE_SYS_FILE_H
  22 #include <sys/file.h>
  23 #endif
  24
  25 #include <afs/afsutil.h>
  26 #include <rx/rx_queue.h>
  27
  28 #include <rx/xdr.h>
  29 #include "afs/afsint.h"
  30 #include "nfs.h"
  31 #include "lwp.h"
  32 #include "lock.h"
  33 #include <afs/afssyscalls.h>
  34 #include "ihandle.h"
  35 #ifdef AFS_NT40_ENV
  36 #include "ntops.h"
  37 #endif
  38 #include "vnode.h"
  39 #include "volume.h"
  40 #include "viceinode.h"
  41 #include "partition.h"
  42 #include "daemon_com.h"
  43 #include "fssync.h"
  44 #include "common.h"
  45
  46 /* forward declarations */
  47 static int ObliterateRegion(Volume * avp, VnodeClass aclass, StreamHandle_t * afile,
  48                             afs_foff_t * aoffset);
  49 #if 0
  50 static void PurgeIndex(Volume * vp, VnodeClass class);
  51 static void PurgeHeader(Volume * vp);
  52 #endif
  53
  54 static void PurgeIndex_r(Volume * vp, VnodeClass class);
  55 static void PurgeHeader_r(Volume * vp);
  56
  57 /* No lock needed. Only the volserver will call this, and only one transaction
  58  * can have a given volume (volid/partition pair) in use at a time
  59  */
  60 void
  61 VPurgeVolume(Error * ec, Volume * vp)
  62 {
  63     struct DiskPartition64 *tpartp = vp->partition;
  64     VolumeId volid, parent;
  65     afs_int32 code;
  66
  67     volid = V_id(vp);
  68     parent = V_parentId(vp);
  69
  70     /* so VCheckDetach doesn't try to update the volume header and
  71      * dump spurious errors into the logs */
  72     V_inUse(vp) = 0;
  73
  74     /* N.B.  it's important here to use the partition pointed to by the
  75      * volume header. This routine can, under some circumstances, be called
  76      * when two volumes with the same id exist on different partitions.
  77      */
  78     PurgeIndex_r(vp, vLarge);
  79     PurgeIndex_r(vp, vSmall);
  80     PurgeHeader_r(vp);
  81
  82     code = VDestroyVolumeDiskHeader(tpartp, volid, parent);
  83     if (code) {
  84         Log("VPurgeVolume: Error %ld when destroying volume %lu header\n",
  85             afs_printable_int32_ld(code),
  86             afs_printable_uint32_lu(volid));
  87     }
  88
  89     /*
  90      * Call the fileserver to break all call backs for that volume
  91      */
  92     FSYNC_VolOp(V_id(vp), tpartp->name, FSYNC_VOL_BREAKCBKS, 0, NULL);
  93 }
  94
  95 #define MAXOBLITATONCE  200
  96 /* delete a portion of an index, adjusting offset appropriately.  Returns 0 if
  97    things work and we should be called again, 1 if success full and done, and -1
  98    if an error occurred.  It adjusts offset appropriately on 0 or 1 return codes,
  99    and otherwise doesn't touch it */
 100 static int
 101 ObliterateRegion(Volume * avp, VnodeClass aclass, StreamHandle_t * afile,
 102                  afs_foff_t * aoffset)
 103 {
 104     struct VnodeClassInfo *vcp;
 105     Inode inodes[MAXOBLITATONCE];
 106     afs_int32 iindex, nscanned;
 107     afs_foff_t offset;
 108     char buf[SIZEOF_LARGEDISKVNODE];
 109     int hitEOF;
 110     int i;
 111     afs_int32 code;
 112     struct VnodeDiskObject *vnode = (struct VnodeDiskObject *)buf;
 113
 114     hitEOF = 0;
 115     vcp = &VnodeClassInfo[aclass];
 116     offset = *aoffset;          /* original offset */
 117     iindex = 0;
 118     nscanned = 0;
 119     /* advance over up to MAXOBLITATONCE inodes.  nscanned tells us how many we examined.
 120      * We remember the inodes in an array, and idec them after zeroing them in the index.
 121      * The reason for these contortions is to make volume deletion idempotent, even
 122      * if we crash in the middle of a delete operation. */
 123     STREAM_ASEEK(afile, offset);
 124     while (1) {
 125         if (iindex >= MAXOBLITATONCE) {
 126             break;
 127         }
 128         code = STREAM_READ(vnode, vcp->diskSize, 1, afile);
 129         nscanned++;
 130         offset += vcp->diskSize;
 131         if (code != 1) {
 132             hitEOF = 1;
 133             break;
 134         }
 135         if (vnode->type != vNull) {
 136             if (vnode->vnodeMagic != vcp->magic)
 137                 goto fail;      /* something really wrong; let salvager take care of it */
 138             if (VNDISK_GET_INO(vnode))
 139                 inodes[iindex++] = VNDISK_GET_INO(vnode);
 140         }
 141     }
 142
 143     /* next, obliterate the index and fflush (and fsync) it */
 144     STREAM_ASEEK(afile, *aoffset);      /* seek back to start of vnode index region */
 145     memset(buf, 0, sizeof(buf));        /* zero out our proto-vnode */
 146     for (i = 0; i < nscanned; i++) {
 147         if (STREAM_WRITE(buf, vcp->diskSize, 1, afile) != 1)
 148             goto fail;
 149     }
 150     STREAM_FLUSH(afile);        /* ensure 0s are on the disk */
 151     OS_SYNC(afile->str_fd);
 152
 153     /* finally, do the idec's */
 154     for (i = 0; i < iindex; i++) {
 155         IH_DEC(V_linkHandle(avp), inodes[i], V_parentId(avp));
 156         DOPOLL;
 157     }
 158
 159     /* return the new offset */
 160     *aoffset = offset;
 161     return hitEOF;              /* return 1 if hit EOF (don't call again), otherwise 0 */
 162
 163   fail:
 164     return -1;
 165 }
 166
 167 #if 0
 168 static void
 169 PurgeIndex(Volume * vp, VnodeClass class)
 170 {
 171     VOL_LOCK;
 172     PurgeIndex_r(vp, class);
 173     VOL_UNLOCK;
 174 }
 175 #endif
 176
 177 static void
 178 PurgeIndex_r(Volume * vp, VnodeClass class)
 179 {
 180     StreamHandle_t *ifile;
 181     struct VnodeClassInfo *vcp = &VnodeClassInfo[class];
 182     afs_foff_t offset;
 183     afs_int32 code;
 184     FdHandle_t *fdP;
 185
 186
 187     fdP = IH_OPEN(vp->vnodeIndex[class].handle);
 188     if (fdP == NULL)
 189         return;
 190
 191     ifile = FDH_FDOPEN(fdP, "r+");
 192     if (!ifile) {
 193         FDH_REALLYCLOSE(fdP);
 194         return;
 195     }
 196
 197     offset = vcp->diskSize;
 198     while (1) {
 199         code = ObliterateRegion(vp, class, ifile, &offset);
 200         if (code)
 201             break;              /* if error or hit EOF */
 202     }
 203     STREAM_CLOSE(ifile);
 204     FDH_CLOSE(fdP);
 205 }
 206
 207 #if 0
 208 static void
 209 PurgeHeader(Volume * vp)
 210 {
 211     VOL_LOCK;
 212     PurgeHeader_r(vp);
 213     VOL_UNLOCK;
 214 }
 215 #endif
 216
 217 static void
 218 PurgeHeader_r(Volume * vp)
 219 {
 220 #ifndef AFS_NAMEI_ENV
 221     /* namei opens and closes the given ihandle during IH_DEC, so don't try to
 222      * also close it here */
 223     IH_REALLYCLOSE(V_diskDataHandle(vp));
 224 #endif
 225     IH_DEC(V_linkHandle(vp), vp->vnodeIndex[vLarge].handle->ih_ino, V_id(vp));
 226     IH_DEC(V_linkHandle(vp), vp->vnodeIndex[vSmall].handle->ih_ino, V_id(vp));
 227     IH_DEC(V_linkHandle(vp), vp->diskDataHandle->ih_ino, V_id(vp));
 228 #ifdef AFS_NAMEI_ENV
 229     /* And last, but not least, the link count table itself. */
 230     IH_DEC(V_linkHandle(vp), vp->linkHandle->ih_ino, V_parentId(vp));
 231 #endif
 232 }