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 */
46 (ndp, attrs, atargetName)
47 struct nameidata *ndp;
49 register char *atargetName;
51 register struct vcache *adp = VTOAFS(ndp->ni_dvp);
52 char *aname = ndp->ni_dent.d_name;
53 struct ucred *acred = ndp->ni_cred;
54 #else /* AFS_OSF_ENV */
55 (OSI_VC_ARG(adp), aname, attrs, atargetName, acred)
60 struct AFS_UCRED *acred;
67 struct VenusFid newFid;
69 afs_size_t offset, len;
71 struct server *hostp = 0;
73 struct AFSStoreStatus InStatus;
74 struct AFSFetchStatus OutFidStatus, OutDirStatus;
75 struct AFSCallBack CallBack;
76 struct AFSVolSync tsync;
77 struct volume *volp = 0;
78 struct afs_fakestat_state fakestate;
82 AFS_STATCNT(afs_symlink);
83 afs_Trace2(afs_iclSetp, CM_TRACE_SYMLINK, ICL_TYPE_POINTER, adp,
84 ICL_TYPE_STRING, aname);
86 if ((code = afs_InitReq(&treq, acred)))
89 afs_InitFakeStat(&fakestate);
90 code = afs_EvalFakeStat(&adp, &fakestate, &treq);
94 if (strlen(aname) > AFSNAMEMAX || strlen(atargetName) > AFSPATHMAX) {
99 if (afs_IsDynroot(adp)) {
100 code = afs_DynrootVOPSymlink(adp, acred, aname, atargetName);
104 code = afs_VerifyVCache(adp, &treq);
106 code = afs_CheckCode(code, &treq, 30);
110 /** If the volume is read-only, return error without making an RPC to the
113 if (adp->states & CRO) {
118 InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE;
119 InStatus.ClientModTime = osi_Time();
120 alen = strlen(atargetName); /* we want it to include the null */
121 if (*atargetName == '#' || *atargetName == '%') {
122 InStatus.UnixModeBits = 0644; /* mt pt: null from "." at end */
124 alen++; /* Empty string */
126 InStatus.UnixModeBits = 0755;
127 alen++; /* add in the null */
129 tdc = afs_GetDCache(adp, (afs_size_t) 0, &treq, &offset, &len, 1);
130 volp = afs_FindVolume(&adp->fid, READ_LOCK); /*parent is also in same vol */
131 ObtainWriteLock(&adp->lock, 156);
133 ObtainWriteLock(&tdc->lock, 636);
134 ObtainSharedLock(&afs_xvcache, 17); /* prevent others from creating this entry */
135 /* XXX Pay attention to afs_xvcache around the whole thing!! XXX */
137 tc = afs_Conn(&adp->fid, &treq, SHARED_LOCK);
139 hostp = tc->srvr->server;
140 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK);
141 if (adp->states & CForeign) {
145 RXAFS_DFSSymlink(tc->id, (struct AFSFid *)&adp->fid.Fid,
146 aname, atargetName, &InStatus,
147 (struct AFSFid *)&newFid.Fid,
148 &OutFidStatus, &OutDirStatus, &CallBack,
154 RXAFS_Symlink(tc->id, (struct AFSFid *)&adp->fid.Fid,
155 aname, atargetName, &InStatus,
156 (struct AFSFid *)&newFid.Fid, &OutFidStatus,
157 &OutDirStatus, &tsync);
164 (tc, code, &adp->fid, &treq, AFS_STATS_FS_RPCIDX_SYMLINK,
167 UpgradeSToWLock(&afs_xvcache, 40);
170 ObtainWriteLock(&afs_xcbhash, 499);
171 afs_DequeueCallback(adp);
172 adp->states &= ~CStatd;
173 ReleaseWriteLock(&afs_xcbhash);
174 osi_dnlc_purgedp(adp);
176 ReleaseWriteLock(&adp->lock);
177 ReleaseWriteLock(&afs_xvcache);
179 ReleaseWriteLock(&tdc->lock);
184 /* otherwise, we should see if we can make the change to the dir locally */
185 if (afs_LocalHero(adp, tdc, &OutDirStatus, 1)) {
186 /* we can do it locally */
187 code = afs_dir_Create(&tdc->f, aname, &newFid.Fid);
189 ZapDCE(tdc); /* surprise error -- use invalid value */
194 ReleaseWriteLock(&tdc->lock);
197 newFid.Cell = adp->fid.Cell;
198 newFid.Fid.Volume = adp->fid.Fid.Volume;
199 ReleaseWriteLock(&adp->lock);
201 /* now we're done with parent dir, create the link's entry. Note that
202 * no one can get a pointer to the new cache entry until we release
203 * the xvcache lock. */
204 tvc = afs_NewVCache(&newFid, hostp);
205 ObtainWriteLock(&tvc->lock, 157);
206 ObtainWriteLock(&afs_xcbhash, 500);
207 tvc->states |= CStatd; /* have valid info */
208 tvc->states &= ~CBulkFetching;
210 if (adp->states & CForeign) {
211 tvc->states |= CForeign;
212 /* We don't have to worry about losing the callback since we're doing it
213 * under the afs_xvcache lock actually, afs_NewVCache may drop the
214 * afs_xvcache lock, if it calls afs_FlushVCache */
215 tvc->cbExpires = CallBack.ExpirationTime + now;
216 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp);
218 tvc->cbExpires = 0x7fffffff; /* never expires, they can't change */
219 /* since it never expires, we don't have to queue the callback */
221 ReleaseWriteLock(&afs_xcbhash);
222 afs_ProcessFS(tvc, &OutFidStatus, &treq);
224 if (!tvc->linkData) {
225 tvc->linkData = (char *)afs_osi_Alloc(alen);
226 strncpy(tvc->linkData, atargetName, alen - 1);
227 tvc->linkData[alen - 1] = 0;
229 ReleaseWriteLock(&tvc->lock);
230 ReleaseWriteLock(&afs_xvcache);
234 afs_PutFakeStat(&fakestate);
236 afs_PutVolume(volp, READ_LOCK);
237 code = afs_CheckCode(code, &treq, 31);
240 AFS_RELE(ndp->ni_dvp);
241 #endif /* AFS_OSF_ENV */
246 afs_MemHandleLink(register struct vcache *avc, struct vrequest *areq)
248 register struct dcache *tdc;
249 register char *tp, *rbuf;
250 afs_size_t offset, len;
251 afs_int32 tlen, alen;
252 register afs_int32 code;
254 AFS_STATCNT(afs_MemHandleLink);
255 /* two different formats, one for links protected 644, have a "." at
256 * the end of the file name, which we turn into a null. Others,
257 * protected 755, we add a null to the end of */
258 if (!avc->linkData) {
260 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
264 /* otherwise we have the data loaded, go for it */
269 if (avc->m.Mode & 0111)
270 alen = len + 1; /* regular link */
272 alen = len; /* mt point */
273 rbuf = (char *)osi_AllocLargeSpace(AFS_LRALLOCSIZ);
274 ObtainReadLock(&tdc->lock);
275 addr = afs_MemCacheOpen(tdc->f.inode);
277 code = afs_MemReadBlk(addr, 0, rbuf, tlen);
278 afs_MemCacheClose(addr);
279 ReleaseReadLock(&tdc->lock);
282 alen = strlen(rbuf) + 1;
283 tp = afs_osi_Alloc(alen); /* make room for terminating null */
284 memcpy(tp, rbuf, alen);
285 osi_FreeLargeSpace(rbuf);
287 afs_osi_Free(tp, alen);
296 afs_UFSHandleLink(register struct vcache *avc, struct vrequest *areq)
298 register struct dcache *tdc;
299 register char *tp, *rbuf;
301 afs_size_t offset, len;
302 afs_int32 tlen, alen;
303 register afs_int32 code;
305 /* two different formats, one for links protected 644, have a "." at the
306 * end of the file name, which we turn into a null. Others, protected
307 * 755, we add a null to the end of */
308 AFS_STATCNT(afs_UFSHandleLink);
309 if (!avc->linkData) {
310 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
311 afs_Trace3(afs_iclSetp, CM_TRACE_UFSLINK, ICL_TYPE_POINTER, avc,
312 ICL_TYPE_POINTER, tdc, ICL_TYPE_OFFSET,
313 ICL_HANDLE_OFFSET(avc->m.Length));
317 /* otherwise we have the data loaded, go for it */
322 if (avc->m.Mode & 0111)
323 alen = len + 1; /* regular link */
325 alen = len; /* mt point */
326 rbuf = (char *)osi_AllocLargeSpace(AFS_LRALLOCSIZ);
328 ObtainReadLock(&tdc->lock);
329 tfile = osi_UFSOpen(tdc->f.inode);
330 code = afs_osi_Read(tfile, -1, rbuf, tlen);
332 ReleaseReadLock(&tdc->lock);
334 rbuf[alen - 1] = '\0';
335 alen = strlen(rbuf) + 1;
336 tp = afs_osi_Alloc(alen); /* make room for terminating null */
337 memcpy(tp, rbuf, alen);
338 osi_FreeLargeSpace(rbuf);
340 afs_osi_Free(tp, alen);
349 afs_readlink(OSI_VC_ARG(avc), auio, acred)
352 struct AFS_UCRED *acred;
354 register afs_int32 code;
355 struct vrequest treq;
357 struct afs_fakestat_state fakestat;
360 AFS_STATCNT(afs_readlink);
361 afs_Trace1(afs_iclSetp, CM_TRACE_READLINK, ICL_TYPE_POINTER, avc);
362 if ((code = afs_InitReq(&treq, acred)))
364 afs_InitFakeStat(&fakestat);
365 code = afs_EvalFakeStat(&avc, &fakestat, &treq);
368 code = afs_VerifyVCache(avc, &treq);
371 if (vType(avc) != VLNK) {
375 ObtainWriteLock(&avc->lock, 158);
376 code = afs_HandleLink(avc, &treq);
377 /* finally uiomove it to user-land */
381 AFS_UIOMOVE(tp, strlen(tp), UIO_READ, auio, code);
386 ReleaseWriteLock(&avc->lock);
388 afs_PutFakeStat(&fakestat);
389 code = afs_CheckCode(code, &treq, 32);