2 * Copyright 2000, International Business Machines Corporation and others.
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
13 Institution: The Information Technology Center, Carnegie-Mellon University
16 #include <afsconfig.h>
17 #include <afs/param.h>
21 #ifdef HAVE_SYS_FILE_H
25 #include <afs/afsutil.h>
26 #include <rx/rx_queue.h>
29 #include "afs/afsint.h"
33 #include <afs/afssyscalls.h>
40 #include "viceinode.h"
41 #include "partition.h"
42 #include "daemon_com.h"
46 /* forward declarations */
47 static int ObliterateRegion(Volume * avp, VnodeClass aclass, StreamHandle_t * afile,
48 afs_foff_t * aoffset);
50 static void PurgeIndex_r(Volume * vp, VnodeClass class);
51 static void PurgeHeader_r(Volume * vp);
53 /* No lock needed. Only the volserver will call this, and only one transaction
54 * can have a given volume (volid/partition pair) in use at a time
57 VPurgeVolume(Error * ec, Volume * vp)
59 struct DiskPartition64 *tpartp = vp->partition;
60 VolumeId volid, parent;
64 parent = V_parentId(vp);
66 /* so VCheckDetach doesn't try to update the volume header and
67 * dump spurious errors into the logs */
70 /* N.B. it's important here to use the partition pointed to by the
71 * volume header. This routine can, under some circumstances, be called
72 * when two volumes with the same id exist on different partitions.
74 PurgeIndex_r(vp, vLarge);
75 PurgeIndex_r(vp, vSmall);
78 code = VDestroyVolumeDiskHeader(tpartp, volid, parent);
80 Log("VPurgeVolume: Error %ld when destroying volume %lu header\n",
81 afs_printable_int32_ld(code),
82 afs_printable_uint32_lu(volid));
86 * Call the fileserver to break all call backs for that volume
88 FSYNC_VolOp(V_id(vp), tpartp->name, FSYNC_VOL_BREAKCBKS, 0, NULL);
91 #define MAXOBLITATONCE 200
92 /* delete a portion of an index, adjusting offset appropriately. Returns 0 if
93 things work and we should be called again, 1 if success full and done, and -1
94 if an error occurred. It adjusts offset appropriately on 0 or 1 return codes,
95 and otherwise doesn't touch it */
97 ObliterateRegion(Volume * avp, VnodeClass aclass, StreamHandle_t * afile,
100 struct VnodeClassInfo *vcp;
101 Inode inodes[MAXOBLITATONCE];
102 afs_int32 iindex, nscanned;
104 char buf[SIZEOF_LARGEDISKVNODE];
108 struct VnodeDiskObject *vnode = (struct VnodeDiskObject *)buf;
111 vcp = &VnodeClassInfo[aclass];
112 offset = *aoffset; /* original offset */
115 /* advance over up to MAXOBLITATONCE inodes. nscanned tells us how many we examined.
116 * We remember the inodes in an array, and idec them after zeroing them in the index.
117 * The reason for these contortions is to make volume deletion idempotent, even
118 * if we crash in the middle of a delete operation. */
119 STREAM_ASEEK(afile, offset);
121 if (iindex >= MAXOBLITATONCE) {
124 code = STREAM_READ(vnode, vcp->diskSize, 1, afile);
126 offset += vcp->diskSize;
131 if (vnode->type != vNull) {
132 if (vnode->vnodeMagic != vcp->magic)
133 goto fail; /* something really wrong; let salvager take care of it */
134 if (VNDISK_GET_INO(vnode))
135 inodes[iindex++] = VNDISK_GET_INO(vnode);
139 /* next, obliterate the index and fflush (and fsync) it */
140 STREAM_ASEEK(afile, *aoffset); /* seek back to start of vnode index region */
141 memset(buf, 0, sizeof(buf)); /* zero out our proto-vnode */
142 for (i = 0; i < nscanned; i++) {
143 if (STREAM_WRITE(buf, vcp->diskSize, 1, afile) != 1)
146 STREAM_FLUSH(afile); /* ensure 0s are on the disk */
147 OS_SYNC(afile->str_fd);
149 /* finally, do the idec's */
150 for (i = 0; i < iindex; i++) {
151 IH_DEC(V_linkHandle(avp), inodes[i], V_parentId(avp));
155 /* return the new offset */
157 return hitEOF; /* return 1 if hit EOF (don't call again), otherwise 0 */
164 PurgeIndex_r(Volume * vp, VnodeClass class)
166 StreamHandle_t *ifile;
167 struct VnodeClassInfo *vcp = &VnodeClassInfo[class];
173 fdP = IH_OPEN(vp->vnodeIndex[class].handle);
177 ifile = FDH_FDOPEN(fdP, "r+");
179 FDH_REALLYCLOSE(fdP);
183 offset = vcp->diskSize;
185 code = ObliterateRegion(vp, class, ifile, &offset);
187 break; /* if error or hit EOF */
194 PurgeHeader_r(Volume * vp)
196 #ifndef AFS_NAMEI_ENV
197 /* namei opens and closes the given ihandle during IH_DEC, so don't try to
198 * also close it here */
199 IH_REALLYCLOSE(V_diskDataHandle(vp));
201 IH_DEC(V_linkHandle(vp), vp->vnodeIndex[vLarge].handle->ih_ino, V_id(vp));
202 IH_DEC(V_linkHandle(vp), vp->vnodeIndex[vSmall].handle->ih_ino, V_id(vp));
203 IH_DEC(V_linkHandle(vp), vp->diskDataHandle->ih_ino, V_id(vp));
205 /* And last, but not least, the link count table itself. */
206 IH_DEC(V_linkHandle(vp), vp->linkHandle->ih_ino, V_parentId(vp));