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"
26 #include "../afs/sysincludes.h" /* Standard vendor system headers */
27 #include "../afs/afsincludes.h" /* Afs-based standard headers */
28 #include "../afs/afs_stats.h" /* statistics */
29 #include "../afs/afs_cbqueue.h"
30 #include "../afs/nfsclient.h"
31 #include "../afs/afs_osidnlc.h"
33 extern afs_rwlock_t afs_xvcache;
34 extern afs_rwlock_t afs_xcbhash;
36 /* Note: There is the bare bones beginning of symlink hints in the now
37 * defunct afs/afs_lookup.c file. Since they are not in use, making the call
38 * is just a performance hit.
42 /* don't set CDirty in here because RPC is called synchronously */
45 (ndp, attrs, atargetName)
46 struct nameidata *ndp;
48 register char *atargetName; {
49 register struct vcache *adp = VTOAFS(ndp->ni_dvp);
50 char *aname = ndp->ni_dent.d_name;
51 struct ucred *acred = ndp->ni_cred;
52 #else /* AFS_OSF_ENV */
53 (OSI_VC_ARG(adp), aname, attrs, atargetName, acred)
58 struct AFS_UCRED *acred; {
64 struct VenusFid newFid;
66 afs_size_t offset, len;
68 struct server *hostp=0;
70 struct AFSStoreStatus InStatus;
71 struct AFSFetchStatus OutFidStatus, OutDirStatus;
72 struct AFSCallBack CallBack;
73 struct AFSVolSync tsync;
74 struct volume* volp=0;
75 struct afs_fakestat_state fakestate;
79 AFS_STATCNT(afs_symlink);
80 afs_Trace2(afs_iclSetp, CM_TRACE_SYMLINK, ICL_TYPE_POINTER, adp,
81 ICL_TYPE_STRING, aname);
83 if (code = afs_InitReq(&treq, acred))
86 afs_InitFakeStat(&fakestate);
87 code = afs_EvalFakeStat(&adp, &fakestate, &treq);
91 if (strlen(aname) > AFSNAMEMAX || strlen(atargetName) > AFSPATHMAX) {
96 if (afs_IsDynroot(adp)) {
97 code = afs_DynrootVOPSymlink(adp, acred, aname, atargetName);
101 code = afs_VerifyVCache(adp, &treq);
103 code = afs_CheckCode(code, &treq, 30);
107 /** If the volume is read-only, return error without making an RPC to the
110 if ( adp->states & CRO ) {
115 InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE;
116 InStatus.ClientModTime = osi_Time();
117 alen = strlen(atargetName); /* we want it to include the null */
118 if (*atargetName == '#' || *atargetName == '%') {
119 InStatus.UnixModeBits = 0644; /* mt pt: null from "." at end */
120 if (alen == 1) alen++; /* Empty string */
122 InStatus.UnixModeBits = 0755;
123 alen++; /* add in the null */
125 tdc = afs_GetDCache(adp, (afs_size_t) 0, &treq, &offset, &len, 1);
126 volp = afs_FindVolume(&adp->fid, READ_LOCK); /*parent is also in same vol*/
127 ObtainWriteLock(&adp->lock,156);
128 if (tdc) ObtainWriteLock(&tdc->lock, 636);
129 ObtainSharedLock(&afs_xvcache,17); /* prevent others from creating this entry */
130 /* XXX Pay attention to afs_xvcache around the whole thing!! XXX */
132 tc = afs_Conn(&adp->fid, &treq, SHARED_LOCK);
134 hostp = tc->srvr->server;
135 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK);
136 if (adp->states & CForeign) {
138 #ifdef RX_ENABLE_LOCKS
140 #endif /* RX_ENABLE_LOCKS */
141 code = RXAFS_DFSSymlink(tc->id, (struct AFSFid *) &adp->fid.Fid, aname,
142 atargetName, &InStatus, (struct AFSFid *) &newFid.Fid,
143 &OutFidStatus, &OutDirStatus, &CallBack, &tsync);
144 #ifdef RX_ENABLE_LOCKS
146 #endif /* RX_ENABLE_LOCKS */
148 #ifdef RX_ENABLE_LOCKS
150 #endif /* RX_ENABLE_LOCKS */
151 code = RXAFS_Symlink(tc->id, (struct AFSFid *) &adp->fid.Fid, aname,
152 atargetName, &InStatus, (struct AFSFid *) &newFid.Fid,
153 &OutFidStatus, &OutDirStatus, &tsync);
154 #ifdef RX_ENABLE_LOCKS
156 #endif /* RX_ENABLE_LOCKS */
162 (afs_Analyze(tc, code, &adp->fid, &treq,
163 AFS_STATS_FS_RPCIDX_SYMLINK, SHARED_LOCK, (struct cell *)0));
165 UpgradeSToWLock(&afs_xvcache,40);
168 ObtainWriteLock(&afs_xcbhash, 499);
169 afs_DequeueCallback(adp);
170 adp->states &= ~CStatd;
171 ReleaseWriteLock(&afs_xcbhash);
172 osi_dnlc_purgedp(adp);
174 ReleaseWriteLock(&adp->lock);
175 ReleaseWriteLock(&afs_xvcache);
177 ReleaseWriteLock(&tdc->lock);
182 /* otherwise, we should see if we can make the change to the dir locally */
183 if (afs_LocalHero(adp, tdc, &OutDirStatus, 1)) {
184 /* we can do it locally */
185 code = afs_dir_Create(&tdc->f.inode, aname, &newFid.Fid);
187 ZapDCE(tdc); /* surprise error -- use invalid value */
192 ReleaseWriteLock(&tdc->lock);
195 newFid.Cell = adp->fid.Cell;
196 newFid.Fid.Volume = adp->fid.Fid.Volume;
197 ReleaseWriteLock(&adp->lock);
199 /* now we're done with parent dir, create the link's entry. Note that
200 * no one can get a pointer to the new cache entry until we release
201 * the xvcache lock. */
202 tvc = afs_NewVCache(&newFid, hostp, 1, WRITE_LOCK);
203 ObtainWriteLock(&tvc->lock,157);
204 ObtainWriteLock(&afs_xcbhash, 500);
205 tvc->states |= CStatd; /* have valid info */
206 tvc->states &= ~CBulkFetching;
208 if (adp->states & CForeign) {
209 tvc->states |= CForeign;
210 /* We don't have to worry about losing the callback since we're doing it
211 * under the afs_xvcache lock actually, afs_NewVCache may drop the
212 * afs_xvcache lock, if it calls afs_FlushVCache */
213 tvc->cbExpires = CallBack.ExpirationTime + now;
214 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp);
216 tvc->cbExpires = 0x7fffffff; /* never expires, they can't change */
217 /* since it never expires, we don't have to queue the callback */
219 ReleaseWriteLock(&afs_xcbhash);
220 afs_ProcessFS(tvc, &OutFidStatus, &treq);
222 if (!tvc->linkData) {
223 tvc->linkData = (char *) afs_osi_Alloc(alen);
224 strncpy(tvc->linkData, atargetName, alen-1);
225 tvc->linkData[alen-1] = 0;
227 ReleaseWriteLock(&tvc->lock);
228 ReleaseWriteLock(&afs_xvcache);
229 afs_PutVCache(tvc, WRITE_LOCK);
232 afs_PutFakeStat(&fakestate);
234 afs_PutVolume(volp, READ_LOCK);
235 code = afs_CheckCode(code, &treq, 31);
238 AFS_RELE(ndp->ni_dvp);
239 #endif /* AFS_OSF_ENV */
243 afs_MemHandleLink(avc, areq)
244 register struct vcache *avc;
245 struct vrequest *areq;
247 register struct dcache *tdc;
248 register char *tp, *rbuf;
249 afs_size_t offset, len;
250 afs_int32 tlen, alen;
251 register afs_int32 code;
253 AFS_STATCNT(afs_MemHandleLink);
254 /* two different formats, one for links protected 644, have a "." at
255 the end of the file name, which we turn into a null. Others,
256 protected 755, we add a null to the end of */
257 if (!avc->linkData) {
259 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
263 /* otherwise we have the data loaded, go for it */
268 if (avc->m.Mode & 0111) alen = len+1; /* regular link */
269 else alen = len; /* mt point */
270 rbuf = (char *) osi_AllocLargeSpace(AFS_LRALLOCSIZ);
271 ObtainReadLock(&tdc->lock);
272 addr = afs_MemCacheOpen(tdc->f.inode);
274 code = afs_MemReadBlk(addr, 0, rbuf, tlen);
275 afs_MemCacheClose(addr);
276 ReleaseReadLock(&tdc->lock);
279 alen = strlen(rbuf) + 1;
280 tp = afs_osi_Alloc(alen); /* make room for terminating null */
281 memcpy(tp, rbuf, alen);
282 osi_FreeLargeSpace(rbuf);
284 afs_osi_Free(tp, alen);
292 afs_UFSHandleLink(avc, areq)
293 register struct vcache *avc;
294 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 end
304 of the file name, which we turn into a null. Others, protected 755,
305 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,
311 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->m.Length));
315 /* otherwise we have the data loaded, go for it */
320 if (avc->m.Mode & 0111) alen = len+1; /* regular link */
321 else alen = len; /* mt point */
322 rbuf = (char *) osi_AllocLargeSpace(AFS_LRALLOCSIZ);
324 ObtainReadLock(&tdc->lock);
325 tfile = osi_UFSOpen (tdc->f.inode);
326 code = afs_osi_Read(tfile, -1, rbuf, tlen);
328 ReleaseReadLock(&tdc->lock);
331 alen = strlen(rbuf) + 1;
332 tp = afs_osi_Alloc(alen); /* make room for terminating null */
333 memcpy(tp, rbuf, alen);
334 osi_FreeLargeSpace(rbuf);
336 afs_osi_Free(tp, alen);
344 afs_readlink(OSI_VC_ARG(avc), auio, acred)
347 struct AFS_UCRED *acred;
349 register afs_int32 code;
350 struct vrequest treq;
352 struct afs_fakestat_state fakestat;
355 AFS_STATCNT(afs_readlink);
356 afs_Trace1(afs_iclSetp, CM_TRACE_READLINK, ICL_TYPE_POINTER, avc);
357 if (code = afs_InitReq(&treq, acred)) return code;
358 afs_InitFakeStat(&fakestat);
359 code = afs_EvalFakeStat(&avc, &fakestat, &treq);
361 code = afs_VerifyVCache(avc, &treq);
363 if (vType(avc) != VLNK) {
367 ObtainWriteLock(&avc->lock,158);
368 code = afs_HandleLink(avc, &treq);
369 /* finally uiomove it to user-land */
372 if (tp) AFS_UIOMOVE(tp, strlen(tp), UIO_READ, auio, code);
377 ReleaseWriteLock(&avc->lock);
379 afs_PutFakeStat(&fakestat);
380 code = afs_CheckCode(code, &treq, 32);