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
16 /* Clone a volume. Assumes the new volume is already created */
18 #include <afsconfig.h>
19 #include <afs/param.h>
28 #include <afs/afs_assert.h>
30 #include <afs/afsint.h>
31 #include <afs/afssyscalls.h>
39 #include "partition.h"
40 #include "viceinode.h"
41 #include "vol_prototypes.h"
44 int (*vol_PollProc) (void) = 0; /* someone must init this */
46 #define ERROR_EXIT(code) do { \
51 /* parameters for idec call - this could just be an IHandle_t, but leaving
52 * open the possibility of decrementing the special files as well.
59 #define CLONE_MAXITEMS 100
61 struct clone_items *next;
63 Inode data[CLONE_MAXITEMS];
67 struct clone_items *first;
68 struct clone_items *last;
71 void CloneVolume(Error *, Volume *, Volume *, Volume *);
74 ci_AddItem(struct clone_head *ah, Inode aino)
76 struct clone_items *ti;
78 /* if no last elt (first call) or last item full, get a new one */
79 if ((!ah->last) || ah->last->nitems >= CLONE_MAXITEMS) {
80 ti = (struct clone_items *)malloc(sizeof(struct clone_items));
82 Log("ci_AddItem: malloc failed\n");
83 osi_Panic("ci_AddItem: malloc failed\n");
86 ti->next = (struct clone_items *)0;
91 /* first dude in the list */
92 ah->first = ah->last = ti;
97 /* now ti points to the end of the list, to a clone_item with room
98 * for at least one more element. Add it.
100 ti->data[ti->nitems++] = aino;
104 /* initialize a clone header */
106 ci_InitHead(struct clone_head *ah)
108 memset(ah, 0, sizeof(*ah));
112 /* apply a function to all dudes in the set */
114 ci_Apply(struct clone_head *ah, int (*aproc) (Inode, void *), void *arock)
116 struct clone_items *ti;
119 for (ti = ah->first; ti; ti = ti->next) {
120 for (i = 0; i < ti->nitems; i++) {
121 (*aproc) (ti->data[i], arock);
127 /* free all dudes in the list */
129 ci_Destroy(struct clone_head *ah)
131 struct clone_items *ti, *ni;
133 for (ti = ah->first; ti; ti = ni) {
134 ni = ti->next; /* guard against freeing */
141 IDecProc(Inode adata, void *arock)
143 struct clone_rock *aparm = (struct clone_rock *)arock;
144 IH_DEC(aparm->h, adata, aparm->vol);
150 DoCloneIndex(Volume * rwvp, Volume * clvp, VnodeClass class, int reclone)
152 afs_int32 code, error = 0;
153 FdHandle_t *rwFd = 0, *clFdIn = 0, *clFdOut = 0;
154 StreamHandle_t *rwfile = 0, *clfilein = 0, *clfileout = 0;
155 IHandle_t *rwH = 0, *clHin = 0, *clHout = 0;
156 char buf[SIZEOF_LARGEDISKVNODE], dbuf[SIZEOF_LARGEDISKVNODE];
157 struct VnodeDiskObject *rwvnode = (struct VnodeDiskObject *)buf;
158 struct VnodeDiskObject *clvnode = (struct VnodeDiskObject *)dbuf;
161 struct clone_head decHead;
162 struct clone_rock decRock;
163 afs_foff_t offset = 0;
164 afs_int32 dircloned, inodeinced;
165 afs_int32 filecount = 0, diskused = 0;
168 struct VnodeClassInfo *vcp = &VnodeClassInfo[class];
169 int ReadWriteOriginal = VolumeWriteable(rwvp);
171 /* Correct number of files in volume: this assumes indexes are always
172 cloned starting with vLarge */
173 if (ReadWriteOriginal && class != vLarge) {
174 filecount = V_filecount(rwvp);
175 diskused = V_diskused(rwvp);
178 /* Open the RW volume's index file and seek to beginning */
179 IH_COPY(rwH, rwvp->vnodeIndex[class].handle);
183 rwfile = FDH_FDOPEN(rwFd, ReadWriteOriginal ? "r+" : "r");
186 STREAM_ASEEK(rwfile, vcp->diskSize); /* Will fail if no vnodes */
188 /* Open the clone volume's index file and seek to beginning */
189 IH_COPY(clHout, clvp->vnodeIndex[class].handle);
190 clFdOut = IH_OPEN(clHout);
193 clfileout = FDH_FDOPEN(clFdOut, "a");
196 code = STREAM_ASEEK(clfileout, vcp->diskSize);
200 /* If recloning, open the new volume's index; this time for
201 * reading. We never read anything that we're simultaneously
202 * writing, so this all works.
205 IH_COPY(clHin, clvp->vnodeIndex[class].handle);
206 clFdIn = IH_OPEN(clHin);
209 clfilein = FDH_FDOPEN(clFdIn, "r");
212 STREAM_ASEEK(clfilein, vcp->diskSize); /* Will fail if no vnodes */
215 /* Initialize list of inodes to nuke */
216 ci_InitHead(&decHead);
217 decRock.h = V_linkHandle(rwvp);
218 decRock.vol = V_parentId(rwvp);
220 /* Read each vnode in the old volume's index file */
221 for (offset = vcp->diskSize;
222 STREAM_READ(rwvnode, vcp->diskSize, 1, rwfile) == 1;
223 offset += vcp->diskSize) {
224 dircloned = inodeinced = 0;
226 /* If we are recloning the volume, read the corresponding vnode
227 * from the clone and determine its inode number.
229 if (reclone && !STREAM_EOF(clfilein)
230 && (STREAM_READ(clvnode, vcp->diskSize, 1, clfilein) == 1)) {
231 clinode = VNDISK_GET_INO(clvnode);
236 if (rwvnode->type != vNull) {
239 if (rwvnode->vnodeMagic != vcp->magic)
241 rwinode = VNDISK_GET_INO(rwvnode);
243 VNDISK_GET_LEN(ll, rwvnode);
244 diskused += nBlocks(ll);
246 /* Increment the inode if not already */
247 if (clinode && (clinode == rwinode)) {
248 clinode = 0; /* already cloned - don't delete later */
249 } else if (rwinode) {
250 if (IH_INC(V_linkHandle(rwvp), rwinode, V_parentId(rwvp)) ==
252 Log("IH_INC failed: %"AFS_PTR_FMT", %s, %u errno %d\n",
253 V_linkHandle(rwvp), PrintInode(stmp, rwinode),
254 V_parentId(rwvp), errno);
261 /* If a directory, mark vnode in old volume as cloned */
262 if ((rwvnode->type == vDirectory) && ReadWriteOriginal) {
265 * It is my firmly held belief that immediately after
266 * copy-on-write, the two directories can be identical.
267 * If the new copy is changed (presumably, that is the very
268 * next thing that will happen) then the dataVersion will
271 /* NOTE: the dataVersion++ is incredibly important!!!.
272 * This will cause the inode created by the file server
273 * on copy-on-write to be stamped with a dataVersion bigger
274 * than the current one. The salvager will then do the
276 rwvnode->dataVersion++;
279 code = STREAM_ASEEK(rwfile, offset);
282 code = STREAM_WRITE(rwvnode, vcp->diskSize, 1, rwfile);
286 code = STREAM_ASEEK(rwfile, offset + vcp->diskSize);
290 rwvnode->dataVersion--; /* Really needs to be set to the value in the inode,
291 * for the read-only volume */
296 /* Overwrite the vnode entry in the clone volume */
298 code = STREAM_WRITE(rwvnode, vcp->diskSize, 1, clfileout);
301 /* Couldn't clone, go back and decrement the inode's link count */
303 if (IH_DEC(V_linkHandle(rwvp), rwinode, V_parentId(rwvp)) ==
305 Log("IH_DEC failed: %"AFS_PTR_FMT", %s, %u errno %d\n",
306 V_linkHandle(rwvp), PrintInode(stmp, rwinode),
307 V_parentId(rwvp), errno);
312 /* And if the directory was marked clone, unmark it */
315 if (STREAM_ASEEK(rwfile, offset) != -1)
316 (void)STREAM_WRITE(rwvnode, vcp->diskSize, 1, rwfile);
321 /* Removal of the old cloned inode */
323 ci_AddItem(&decHead, clinode); /* just queue it */
328 if (STREAM_ERROR(clfileout))
331 /* Clean out any junk at end of clone file */
333 STREAM_ASEEK(clfilein, offset);
334 while (STREAM_READ(clvnode, vcp->diskSize, 1, clfilein) == 1) {
335 if (clvnode->type != vNull && VNDISK_GET_INO(clvnode) != 0) {
336 ci_AddItem(&decHead, VNDISK_GET_INO(clvnode));
342 /* come here to finish up. If code is non-zero, we've already run into problems,
343 * and shouldn't do the idecs.
347 STREAM_CLOSE(rwfile);
349 STREAM_CLOSE(clfilein);
351 STREAM_CLOSE(clfileout);
367 /* Next, we sync the disk. We have to reopen in case we're truncating,
368 * since we were using stdio above, and don't know when the buffers
369 * would otherwise be flushed. There's no stdio fftruncate call.
371 rwFd = IH_OPEN(clvp->vnodeIndex[class].handle);
377 /* If doing a reclone, we're keeping the clone. We need to
378 * truncate the file to offset bytes.
380 if (reclone && !error) {
381 error = FDH_TRUNC(rwFd, offset);
388 /* Now finally do the idec's. At this point, all potential
389 * references have been cleaned up and sent to the disk
390 * (see above fclose and fsync). No matter what happens, we
391 * no longer need to keep these references around.
393 code = ci_Apply(&decHead, IDecProc, (char *)&decRock);
396 ci_Destroy(&decHead);
398 if (ReadWriteOriginal && filecount > 0)
399 V_filecount(rwvp) = filecount;
400 if (ReadWriteOriginal && diskused > 0)
401 V_diskused(rwvp) = diskused;
406 CloneVolume(Error * rerror, Volume * original, Volume * new, Volume * old)
408 afs_int32 code, error = 0;
410 afs_int32 filecount = V_filecount(original), diskused = V_diskused(original);
413 reclone = ((new == old) ? 1 : 0);
415 code = DoCloneIndex(original, new, vLarge, reclone);
418 code = DoCloneIndex(original, new, vSmall, reclone);
421 if (filecount != V_filecount(original) || diskused != V_diskused(original))
422 Log("Clone %u: filecount %d -> %d diskused %d -> %d\n",
423 V_id(original), filecount, V_filecount(original), diskused, V_diskused(original));
425 code = CopyVolumeHeader(&V_disk(original), &V_disk(new));