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
11 * afs_vnop_symlink.c - symlink and readlink vnodeops.
21 #include <afsconfig.h>
22 #include "afs/param.h"
25 #include "afs/sysincludes.h" /* Standard vendor system headers */
26 #include "afsincludes.h" /* Afs-based standard headers */
27 #include "afs/afs_stats.h" /* statistics */
28 #include "afs/afs_cbqueue.h"
29 #include "afs/nfsclient.h"
30 #include "afs/afs_osidnlc.h"
32 extern afs_rwlock_t afs_xvcache;
33 extern afs_rwlock_t afs_xcbhash;
35 /* Note: There is the bare bones beginning of symlink hints in the now
36 * defunct afs/afs_lookup.c file. Since they are not in use, making the call
37 * is just a performance hit.
41 afs_DisconCreateSymlink(struct vcache *avc, char *aname,
42 struct vrequest *areq) {
44 struct osi_file *tfile;
45 afs_size_t offset, len;
47 tdc = afs_GetDCache(avc, 0, areq, &offset, &len, 0);
49 /* printf("afs_DisconCreateSymlink: can't get new dcache for symlink.\n"); */
54 avc->f.m.Length = len;
56 ObtainWriteLock(&tdc->lock, 720);
57 afs_AdjustSize(tdc, len);
59 tfile = afs_CFileOpen(&tdc->f.inode);
61 afs_CFileWrite(tfile, 0, aname, len);
62 afs_CFileClose(tfile);
63 ReleaseWriteLock(&tdc->lock);
67 /* don't set CDirty in here because RPC is called synchronously */
69 afs_symlink(OSI_VC_DECL(adp), char *aname, struct vattr *attrs,
70 char *atargetName, struct vcache **tvcp, afs_ucred_t *acred)
73 struct vrequest *treq = NULL;
76 struct VenusFid newFid;
78 afs_size_t offset, len;
80 struct server *hostp = 0;
82 struct AFSStoreStatus InStatus;
83 struct AFSFetchStatus *OutFidStatus, *OutDirStatus;
84 struct AFSCallBack CallBack;
85 struct AFSVolSync tsync;
86 struct volume *volp = 0;
87 struct afs_fakestat_state fakestate;
88 struct rx_connection *rxconn;
92 AFS_STATCNT(afs_symlink);
93 afs_Trace2(afs_iclSetp, CM_TRACE_SYMLINK, ICL_TYPE_POINTER, adp,
94 ICL_TYPE_STRING, aname);
96 OutFidStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
97 OutDirStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
98 memset(&InStatus, 0, sizeof(InStatus));
100 if ((code = afs_CreateReq(&treq, acred)))
103 afs_InitFakeStat(&fakestate);
107 code = afs_EvalFakeStat(&adp, &fakestate, treq);
111 if (strlen(aname) > AFSNAMEMAX || strlen(atargetName) > AFSPATHMAX) {
116 if (afs_IsDynroot(adp)) {
117 code = afs_DynrootVOPSymlink(adp, acred, aname, atargetName);
120 if (afs_IsDynrootMount(adp)) {
125 code = afs_VerifyVCache(adp, treq);
127 code = afs_CheckCode(code, treq, 30);
131 /** If the volume is read-only, return error without making an RPC to the
134 if (adp->f.states & CRO) {
139 if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) {
144 InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE;
145 InStatus.ClientModTime = osi_Time();
146 alen = strlen(atargetName); /* we want it to include the null */
147 if ( (*atargetName == '#' || *atargetName == '%') && alen > 1 && atargetName[alen-1] == '.') {
148 InStatus.UnixModeBits = 0644; /* mt pt: null from "." at end */
150 alen++; /* Empty string */
152 InStatus.UnixModeBits = 0755;
153 alen++; /* add in the null */
155 tdc = afs_GetDCache(adp, (afs_size_t) 0, treq, &offset, &len, 1);
156 volp = afs_FindVolume(&adp->f.fid, READ_LOCK); /*parent is also in same vol */
157 ObtainWriteLock(&adp->lock, 156);
159 ObtainWriteLock(&tdc->lock, 636);
160 /* No further locks: if the SymLink succeeds, it does not matter what happens
161 * to our local copy of the directory. If somebody tampers with it in the meantime,
162 * the copy will be invalidated */
163 if (!AFS_IS_DISCON_RW) {
165 tc = afs_Conn(&adp->f.fid, treq, SHARED_LOCK, &rxconn);
167 hostp = tc->parent->srvr->server;
168 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK);
169 if (adp->f.states & CForeign) {
173 RXAFS_DFSSymlink(rxconn,
174 (struct AFSFid *)&adp->f.fid.Fid,
175 aname, atargetName, &InStatus,
176 (struct AFSFid *)&newFid.Fid,
177 OutFidStatus, OutDirStatus,
183 RXAFS_Symlink(rxconn, (struct AFSFid *)&adp->f.fid.Fid,
184 aname, atargetName, &InStatus,
185 (struct AFSFid *)&newFid.Fid,
186 OutFidStatus, OutDirStatus, &tsync);
193 (tc, rxconn, code, &adp->f.fid, treq, AFS_STATS_FS_RPCIDX_SYMLINK,
196 newFid.Cell = adp->f.fid.Cell;
197 newFid.Fid.Volume = adp->f.fid.Fid.Volume;
198 afs_GenFakeFid(&newFid, VREG, 0);
201 ObtainWriteLock(&afs_xvcache, 40);
204 afs_StaleVCache(adp);
206 ReleaseWriteLock(&adp->lock);
207 ReleaseWriteLock(&afs_xvcache);
209 ReleaseWriteLock(&tdc->lock);
214 /* otherwise, we should see if we can make the change to the dir locally */
215 if (AFS_IS_DISCON_RW || afs_LocalHero(adp, tdc, OutDirStatus, 1)) {
216 /* we can do it locally */
217 ObtainWriteLock(&afs_xdcache, 293);
218 /* If the following fails because the name has been created in the meantime, the
219 * directory is out-of-date - the file server knows best! */
220 code = afs_dir_Create(tdc, aname, &newFid.Fid);
221 ReleaseWriteLock(&afs_xdcache);
222 if (code && !AFS_IS_DISCON_RW) {
223 ZapDCE(tdc); /* surprise error -- use invalid value */
228 ReleaseWriteLock(&tdc->lock);
231 newFid.Cell = adp->f.fid.Cell;
232 newFid.Fid.Volume = adp->f.fid.Fid.Volume;
233 ReleaseWriteLock(&adp->lock);
235 /* now we're done with parent dir, create the link's entry. Note that
236 * no one can get a pointer to the new cache entry until we release
237 * the xvcache lock. */
238 tvc = afs_NewVCache(&newFid, hostp);
242 ReleaseWriteLock(&afs_xvcache);
245 ObtainWriteLock(&tvc->lock, 157);
246 ObtainWriteLock(&afs_xcbhash, 500);
247 tvc->f.states |= CStatd; /* have valid info */
248 tvc->f.states &= ~CBulkFetching;
250 if (adp->f.states & CForeign) {
251 tvc->f.states |= CForeign;
252 /* We don't have to worry about losing the callback since we're doing it
253 * under the afs_xvcache lock actually, afs_NewVCache may drop the
254 * afs_xvcache lock, if it calls afs_FlushVCache */
255 tvc->cbExpires = CallBack.ExpirationTime + now;
256 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp);
258 tvc->cbExpires = 0x7fffffff; /* never expires, they can't change */
259 /* since it never expires, we don't have to queue the callback */
261 ReleaseWriteLock(&afs_xcbhash);
263 if (AFS_IS_DISCON_RW) {
264 attrs->va_mode = InStatus.UnixModeBits;
265 afs_GenDisconStatus(adp, tvc, &newFid, attrs, treq, VLNK);
266 code = afs_DisconCreateSymlink(tvc, atargetName, treq);
268 /* XXX - When this goes wrong, we need to tidy up the changes we made to
269 * the parent, and get rid of the vcache we just created */
270 ReleaseWriteLock(&tvc->lock);
271 ReleaseWriteLock(&afs_xvcache);
275 afs_DisconAddDirty(tvc, VDisconCreate, 0);
277 afs_ProcessFS(tvc, OutFidStatus, treq);
280 if (!tvc->linkData) {
281 tvc->linkData = afs_osi_Alloc(alen);
282 osi_Assert(tvc->linkData != NULL);
283 strncpy(tvc->linkData, atargetName, alen - 1);
284 tvc->linkData[alen - 1] = 0;
286 ReleaseWriteLock(&tvc->lock);
287 ReleaseWriteLock(&afs_xvcache);
294 afs_PutFakeStat(&fakestate);
296 afs_PutVolume(volp, READ_LOCK);
298 code = afs_CheckCode(code, treq, 31);
299 afs_DestroyReq(treq);
301 osi_FreeSmallSpace(OutFidStatus);
302 osi_FreeSmallSpace(OutDirStatus);
307 afs_MemHandleLink(struct vcache *avc, struct vrequest *areq)
311 afs_size_t offset, len;
312 afs_int32 tlen, alen;
315 AFS_STATCNT(afs_MemHandleLink);
316 /* two different formats, one for links protected 644, have a "." at
317 * the end of the file name, which we turn into a null. Others,
318 * protected 755, we add a null to the end of */
319 if (!avc->linkData) {
321 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
325 /* otherwise we have the data loaded, go for it */
330 if (avc->f.m.Mode & 0111)
331 alen = len + 1; /* regular link */
333 alen = len; /* mt point */
334 rbuf = osi_AllocLargeSpace(AFS_LRALLOCSIZ);
335 ObtainReadLock(&tdc->lock);
336 addr = afs_MemCacheOpen(&tdc->f.inode);
338 code = afs_MemReadBlk(addr, 0, rbuf, tlen);
339 afs_MemCacheClose(addr);
340 ReleaseReadLock(&tdc->lock);
343 alen = strlen(rbuf) + 1;
344 tp = afs_osi_Alloc(alen); /* make room for terminating null */
345 osi_Assert(tp != NULL);
346 memcpy(tp, rbuf, alen);
347 osi_FreeLargeSpace(rbuf);
349 afs_osi_Free(tp, alen);
358 afs_UFSHandleLink(struct vcache *avc, struct vrequest *areq)
363 afs_size_t offset, len;
364 afs_int32 tlen, alen;
367 /* two different formats, one for links protected 644, have a "." at the
368 * end of the file name, which we turn into a null. Others, protected
369 * 755, we add a null to the end of */
370 AFS_STATCNT(afs_UFSHandleLink);
371 if (!avc->linkData) {
372 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
373 afs_Trace3(afs_iclSetp, CM_TRACE_UFSLINK, ICL_TYPE_POINTER, avc,
374 ICL_TYPE_POINTER, tdc, ICL_TYPE_OFFSET,
375 ICL_HANDLE_OFFSET(avc->f.m.Length));
377 if (AFS_IS_DISCONNECTED)
382 /* otherwise we have the data loaded, go for it */
387 if (avc->f.m.Mode & 0111)
388 alen = len + 1; /* regular link */
390 alen = len; /* mt point */
391 rbuf = osi_AllocLargeSpace(AFS_LRALLOCSIZ);
393 ObtainReadLock(&tdc->lock);
394 tfile = osi_UFSOpen(&tdc->f.inode);
396 ReleaseReadLock(&tdc->lock);
398 osi_FreeLargeSpace(rbuf);
401 code = afs_osi_Read(tfile, -1, rbuf, tlen);
403 ReleaseReadLock(&tdc->lock);
405 rbuf[alen - 1] = '\0';
406 alen = strlen(rbuf) + 1;
407 tp = afs_osi_Alloc(alen); /* make room for terminating null */
408 osi_Assert(tp != NULL);
409 memcpy(tp, rbuf, alen);
410 osi_FreeLargeSpace(rbuf);
412 afs_osi_Free(tp, alen);
421 afs_readlink(OSI_VC_DECL(avc), struct uio *auio, afs_ucred_t *acred)
424 struct vrequest *treq = NULL;
426 struct afs_fakestat_state fakestat;
429 AFS_STATCNT(afs_readlink);
430 afs_Trace1(afs_iclSetp, CM_TRACE_READLINK, ICL_TYPE_POINTER, avc);
431 if ((code = afs_CreateReq(&treq, acred)))
433 afs_InitFakeStat(&fakestat);
437 code = afs_EvalFakeStat(&avc, &fakestat, treq);
440 code = afs_VerifyVCache(avc, treq);
443 if (vType(avc) != VLNK) {
447 ObtainWriteLock(&avc->lock, 158);
448 code = afs_HandleLink(avc, treq);
449 /* finally uiomove it to user-land */
453 AFS_UIOMOVE(tp, strlen(tp), UIO_READ, auio, code);
458 ReleaseWriteLock(&avc->lock);
460 afs_PutFakeStat(&fakestat);
462 code = afs_CheckCode(code, treq, 32);
463 afs_DestroyReq(treq);