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>
25 #include <sys/param.h>
32 #include <afs/assert.h>
33 #include <afs/afsutil.h>
36 #include "afs/afsint.h"
40 #include <afs/afssyscalls.h>
47 #include "viceinode.h"
48 #include "partition.h"
49 #include "daemon_com.h"
53 /* forward declarations */
54 static int ObliterateRegion(Volume * avp, VnodeClass aclass, StreamHandle_t * afile,
57 static void PurgeIndex(Volume * vp, VnodeClass class);
58 static void PurgeHeader(Volume * vp);
61 static void PurgeIndex_r(Volume * vp, VnodeClass class);
62 static void PurgeHeader_r(Volume * vp);
64 /* No lock needed. Only the volserver will call this, and only one transaction
65 * can have a given volume (volid/partition pair) in use at a time
68 VPurgeVolume(Error * ec, Volume * vp)
70 struct DiskPartition64 *tpartp = vp->partition;
71 VolumeId volid, parent;
75 parent = V_parentId(vp);
77 /* so VCheckDetach doesn't try to update the volume header and
78 * dump spurious errors into the logs */
81 /* N.B. it's important here to use the partition pointed to by the
82 * volume header. This routine can, under some circumstances, be called
83 * when two volumes with the same id exist on different partitions.
85 PurgeIndex_r(vp, vLarge);
86 PurgeIndex_r(vp, vSmall);
89 code = VDestroyVolumeDiskHeader(tpartp, volid, parent);
91 Log("VPurgeVolume: Error %ld when destroying volume %lu header\n",
92 afs_printable_int32_ld(code),
93 afs_printable_uint32_lu(volid));
97 * Call the fileserver to break all call backs for that volume
99 FSYNC_VolOp(V_id(vp), tpartp->name, FSYNC_VOL_BREAKCBKS, 0, NULL);
102 #define MAXOBLITATONCE 200
103 /* delete a portion of an index, adjusting offset appropriately. Returns 0 if
104 things work and we should be called again, 1 if success full and done, and -1
105 if an error occurred. It adjusts offset appropriately on 0 or 1 return codes,
106 and otherwise doesn't touch it */
108 ObliterateRegion(Volume * avp, VnodeClass aclass, StreamHandle_t * afile,
111 register struct VnodeClassInfo *vcp;
112 Inode inodes[MAXOBLITATONCE];
113 register afs_int32 iindex, nscanned;
115 char buf[SIZEOF_LARGEDISKVNODE];
118 register afs_int32 code;
119 register struct VnodeDiskObject *vnode = (struct VnodeDiskObject *)buf;
122 vcp = &VnodeClassInfo[aclass];
123 offset = *aoffset; /* original offset */
126 /* advance over up to MAXOBLITATONCE inodes. nscanned tells us how many we examined.
127 * We remember the inodes in an array, and idec them after zeroing them in the index.
128 * The reason for these contortions is to make volume deletion idempotent, even
129 * if we crash in the middle of a delete operation. */
130 STREAM_SEEK(afile, offset, 0);
132 if (iindex >= MAXOBLITATONCE) {
135 code = STREAM_READ(vnode, vcp->diskSize, 1, afile);
137 offset += vcp->diskSize;
142 if (vnode->type != vNull) {
143 if (vnode->vnodeMagic != vcp->magic)
144 goto fail; /* something really wrong; let salvager take care of it */
145 if (VNDISK_GET_INO(vnode))
146 inodes[iindex++] = VNDISK_GET_INO(vnode);
150 /* next, obliterate the index and fflush (and fsync) it */
151 STREAM_SEEK(afile, *aoffset, 0); /* seek back to start of vnode index region */
152 memset(buf, 0, sizeof(buf)); /* zero out our proto-vnode */
153 for (i = 0; i < nscanned; i++) {
154 if (STREAM_WRITE(buf, vcp->diskSize, 1, afile) != 1)
157 STREAM_FLUSH(afile); /* ensure 0s are on the disk */
158 OS_SYNC(afile->str_fd);
160 /* finally, do the idec's */
161 for (i = 0; i < iindex; i++) {
162 IH_DEC(V_linkHandle(avp), inodes[i], V_parentId(avp));
166 /* return the new offset */
168 return hitEOF; /* return 1 if hit EOF (don't call again), otherwise 0 */
176 PurgeIndex(Volume * vp, VnodeClass class)
179 PurgeIndex_r(vp, class);
185 PurgeIndex_r(Volume * vp, VnodeClass class)
187 StreamHandle_t *ifile;
188 struct VnodeClassInfo *vcp = &VnodeClassInfo[class];
190 register afs_int32 code;
194 fdP = IH_OPEN(vp->vnodeIndex[class].handle);
198 ifile = FDH_FDOPEN(fdP, "r+");
200 FDH_REALLYCLOSE(fdP);
204 offset = vcp->diskSize;
206 code = ObliterateRegion(vp, class, ifile, &offset);
208 break; /* if error or hit EOF */
216 PurgeHeader(Volume * vp)
225 PurgeHeader_r(Volume * vp)
227 IH_REALLYCLOSE(V_diskDataHandle(vp));
228 IH_DEC(V_linkHandle(vp), vp->vnodeIndex[vLarge].handle->ih_ino, V_id(vp));
229 IH_DEC(V_linkHandle(vp), vp->vnodeIndex[vSmall].handle->ih_ino, V_id(vp));
230 IH_DEC(V_linkHandle(vp), vp->diskDataHandle->ih_ino, V_id(vp));
232 /* And last, but not least, the link count table itself. */
233 IH_REALLYCLOSE(V_linkHandle(vp));
234 IH_DEC(V_linkHandle(vp), vp->linkHandle->ih_ino, V_parentId(vp));