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"
27 #include "afs/sysincludes.h" /* Standard vendor system headers */
28 #include "afsincludes.h" /* Afs-based standard headers */
29 #include "afs/afs_stats.h" /* statistics */
30 #include "afs/afs_cbqueue.h"
31 #include "afs/nfsclient.h"
32 #include "afs/afs_osidnlc.h"
34 extern afs_rwlock_t afs_xvcache;
35 extern afs_rwlock_t afs_xcbhash;
37 /* Note: There is the bare bones beginning of symlink hints in the now
38 * defunct afs/afs_lookup.c file. Since they are not in use, making the call
39 * is just a performance hit.
43 /* don't set CDirty in here because RPC is called synchronously */
45 (OSI_VC_ARG(adp), aname, attrs, atargetName, acred)
50 struct AFS_UCRED *acred;
56 struct VenusFid newFid;
58 afs_size_t offset, len;
60 struct server *hostp = 0;
62 struct AFSStoreStatus InStatus;
63 struct AFSFetchStatus OutFidStatus, OutDirStatus;
64 struct AFSCallBack CallBack;
65 struct AFSVolSync tsync;
66 struct volume *volp = 0;
67 struct afs_fakestat_state fakestate;
71 AFS_STATCNT(afs_symlink);
72 afs_Trace2(afs_iclSetp, CM_TRACE_SYMLINK, ICL_TYPE_POINTER, adp,
73 ICL_TYPE_STRING, aname);
75 if ((code = afs_InitReq(&treq, acred)))
78 afs_InitFakeStat(&fakestate);
79 code = afs_EvalFakeStat(&adp, &fakestate, &treq);
83 if (strlen(aname) > AFSNAMEMAX || strlen(atargetName) > AFSPATHMAX) {
88 if (afs_IsDynroot(adp)) {
89 code = afs_DynrootVOPSymlink(adp, acred, aname, atargetName);
92 if (afs_IsDynrootMount(adp)) {
97 code = afs_VerifyVCache(adp, &treq);
99 code = afs_CheckCode(code, &treq, 30);
103 /** If the volume is read-only, return error without making an RPC to the
106 if (adp->states & CRO) {
111 InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE;
112 InStatus.ClientModTime = osi_Time();
113 alen = strlen(atargetName); /* we want it to include the null */
114 if (*atargetName == '#' || *atargetName == '%') {
115 InStatus.UnixModeBits = 0644; /* mt pt: null from "." at end */
117 alen++; /* Empty string */
119 InStatus.UnixModeBits = 0755;
120 alen++; /* add in the null */
122 tdc = afs_GetDCache(adp, (afs_size_t) 0, &treq, &offset, &len, 1);
123 volp = afs_FindVolume(&adp->fid, READ_LOCK); /*parent is also in same vol */
124 ObtainWriteLock(&adp->lock, 156);
126 ObtainWriteLock(&tdc->lock, 636);
127 ObtainSharedLock(&afs_xvcache, 17); /* prevent others from creating this entry */
128 /* XXX Pay attention to afs_xvcache around the whole thing!! XXX */
130 tc = afs_Conn(&adp->fid, &treq, SHARED_LOCK);
132 hostp = tc->srvr->server;
133 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK);
134 if (adp->states & CForeign) {
138 RXAFS_DFSSymlink(tc->id, (struct AFSFid *)&adp->fid.Fid,
139 aname, atargetName, &InStatus,
140 (struct AFSFid *)&newFid.Fid,
141 &OutFidStatus, &OutDirStatus, &CallBack,
147 RXAFS_Symlink(tc->id, (struct AFSFid *)&adp->fid.Fid,
148 aname, atargetName, &InStatus,
149 (struct AFSFid *)&newFid.Fid, &OutFidStatus,
150 &OutDirStatus, &tsync);
157 (tc, code, &adp->fid, &treq, AFS_STATS_FS_RPCIDX_SYMLINK,
160 UpgradeSToWLock(&afs_xvcache, 40);
163 ObtainWriteLock(&afs_xcbhash, 499);
164 afs_DequeueCallback(adp);
165 adp->states &= ~CStatd;
166 ReleaseWriteLock(&afs_xcbhash);
167 osi_dnlc_purgedp(adp);
169 ReleaseWriteLock(&adp->lock);
170 ReleaseWriteLock(&afs_xvcache);
172 ReleaseWriteLock(&tdc->lock);
177 /* otherwise, we should see if we can make the change to the dir locally */
178 if (afs_LocalHero(adp, tdc, &OutDirStatus, 1)) {
179 /* we can do it locally */
180 ObtainWriteLock(&afs_xdcache, 293);
181 code = afs_dir_Create(tdc, aname, &newFid.Fid);
182 ReleaseWriteLock(&afs_xdcache);
184 ZapDCE(tdc); /* surprise error -- use invalid value */
189 ReleaseWriteLock(&tdc->lock);
192 newFid.Cell = adp->fid.Cell;
193 newFid.Fid.Volume = adp->fid.Fid.Volume;
194 ReleaseWriteLock(&adp->lock);
196 /* now we're done with parent dir, create the link's entry. Note that
197 * no one can get a pointer to the new cache entry until we release
198 * the xvcache lock. */
199 tvc = afs_NewVCache(&newFid, hostp);
203 ReleaseWriteLock(&afs_xvcache);
206 ObtainWriteLock(&tvc->lock, 157);
207 ObtainWriteLock(&afs_xcbhash, 500);
208 tvc->states |= CStatd; /* have valid info */
209 tvc->states &= ~CBulkFetching;
211 if (adp->states & CForeign) {
212 tvc->states |= CForeign;
213 /* We don't have to worry about losing the callback since we're doing it
214 * under the afs_xvcache lock actually, afs_NewVCache may drop the
215 * afs_xvcache lock, if it calls afs_FlushVCache */
216 tvc->cbExpires = CallBack.ExpirationTime + now;
217 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp);
219 tvc->cbExpires = 0x7fffffff; /* never expires, they can't change */
220 /* since it never expires, we don't have to queue the callback */
222 ReleaseWriteLock(&afs_xcbhash);
223 afs_ProcessFS(tvc, &OutFidStatus, &treq);
225 if (!tvc->linkData) {
226 tvc->linkData = (char *)afs_osi_Alloc(alen);
227 strncpy(tvc->linkData, atargetName, alen - 1);
228 tvc->linkData[alen - 1] = 0;
230 ReleaseWriteLock(&tvc->lock);
231 ReleaseWriteLock(&afs_xvcache);
235 afs_PutFakeStat(&fakestate);
237 afs_PutVolume(volp, READ_LOCK);
238 code = afs_CheckCode(code, &treq, 31);
244 afs_MemHandleLink(register struct vcache *avc, struct vrequest *areq)
246 register struct dcache *tdc;
247 register char *tp, *rbuf;
248 afs_size_t offset, len;
249 afs_int32 tlen, alen;
250 register afs_int32 code;
252 AFS_STATCNT(afs_MemHandleLink);
253 /* two different formats, one for links protected 644, have a "." at
254 * the end of the file name, which we turn into a null. Others,
255 * protected 755, we add a null to the end of */
256 if (!avc->linkData) {
258 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
262 /* otherwise we have the data loaded, go for it */
267 if (avc->m.Mode & 0111)
268 alen = len + 1; /* regular link */
270 alen = len; /* mt point */
271 rbuf = (char *)osi_AllocLargeSpace(AFS_LRALLOCSIZ);
272 ObtainReadLock(&tdc->lock);
273 addr = afs_MemCacheOpen(tdc->f.inode);
275 code = afs_MemReadBlk(addr, 0, rbuf, tlen);
276 afs_MemCacheClose(addr);
277 ReleaseReadLock(&tdc->lock);
280 alen = strlen(rbuf) + 1;
281 tp = afs_osi_Alloc(alen); /* make room for terminating null */
282 memcpy(tp, rbuf, alen);
283 osi_FreeLargeSpace(rbuf);
285 afs_osi_Free(tp, alen);
294 afs_UFSHandleLink(register struct vcache *avc, struct vrequest *areq)
296 register struct dcache *tdc;
297 register char *tp, *rbuf;
299 afs_size_t offset, len;
300 afs_int32 tlen, alen;
301 register afs_int32 code;
303 /* two different formats, one for links protected 644, have a "." at the
304 * end of the file name, which we turn into a null. Others, protected
305 * 755, we add a null to the end of */
306 AFS_STATCNT(afs_UFSHandleLink);
307 if (!avc->linkData) {
308 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
309 afs_Trace3(afs_iclSetp, CM_TRACE_UFSLINK, ICL_TYPE_POINTER, avc,
310 ICL_TYPE_POINTER, tdc, ICL_TYPE_OFFSET,
311 ICL_HANDLE_OFFSET(avc->m.Length));
315 /* otherwise we have the data loaded, go for it */
320 if (avc->m.Mode & 0111)
321 alen = len + 1; /* regular link */
323 alen = len; /* mt point */
324 rbuf = (char *)osi_AllocLargeSpace(AFS_LRALLOCSIZ);
326 ObtainReadLock(&tdc->lock);
327 tfile = osi_UFSOpen(tdc->f.inode);
328 code = afs_osi_Read(tfile, -1, rbuf, tlen);
330 ReleaseReadLock(&tdc->lock);
332 rbuf[alen - 1] = '\0';
333 alen = strlen(rbuf) + 1;
334 tp = afs_osi_Alloc(alen); /* make room for terminating null */
335 memcpy(tp, rbuf, alen);
336 osi_FreeLargeSpace(rbuf);
338 afs_osi_Free(tp, alen);
347 afs_readlink(OSI_VC_ARG(avc), auio, acred)
350 struct AFS_UCRED *acred;
352 register afs_int32 code;
353 struct vrequest treq;
355 struct afs_fakestat_state fakestat;
358 AFS_STATCNT(afs_readlink);
359 afs_Trace1(afs_iclSetp, CM_TRACE_READLINK, ICL_TYPE_POINTER, avc);
360 if ((code = afs_InitReq(&treq, acred)))
362 afs_InitFakeStat(&fakestat);
363 code = afs_EvalFakeStat(&avc, &fakestat, &treq);
366 code = afs_VerifyVCache(avc, &treq);
369 if (vType(avc) != VLNK) {
373 ObtainWriteLock(&avc->lock, 158);
374 code = afs_HandleLink(avc, &treq);
375 /* finally uiomove it to user-land */
379 AFS_UIOMOVE(tp, strlen(tp), UIO_READ, auio, code);
384 ReleaseWriteLock(&avc->lock);
386 afs_PutFakeStat(&fakestat);
387 code = afs_CheckCode(code, &treq, 32);