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 = (struct vcache *)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;
78 AFS_STATCNT(afs_symlink);
79 afs_Trace2(afs_iclSetp, CM_TRACE_SYMLINK, ICL_TYPE_POINTER, adp,
80 ICL_TYPE_STRING, aname);
82 if (strlen(aname) > AFSNAMEMAX || strlen(atargetName) > AFSPATHMAX) {
87 if (afs_IsDynroot(adp)) {
88 code = afs_DynrootVOPSymlink(adp, acred, aname, atargetName);
92 if (code = afs_InitReq(&treq, acred))
95 code = afs_VerifyVCache(adp, &treq);
97 code = afs_CheckCode(code, &treq, 30);
101 /** If the volume is read-only, return error without making an RPC to the
104 if ( adp->states & CRO ) {
109 InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE;
110 InStatus.ClientModTime = osi_Time();
111 alen = strlen(atargetName); /* we want it to include the null */
112 if (*atargetName == '#' || *atargetName == '%') {
113 InStatus.UnixModeBits = 0644; /* mt pt: null from "." at end */
114 if (alen == 1) alen++; /* Empty string */
116 InStatus.UnixModeBits = 0755;
117 alen++; /* add in the null */
119 tdc = afs_GetDCache(adp, (afs_size_t) 0, &treq, &offset, &len, 1);
120 volp = afs_FindVolume(&adp->fid, READ_LOCK); /*parent is also in same vol*/
121 ObtainWriteLock(&adp->lock,156);
122 ObtainWriteLock(&tdc->lock, 636);
123 ObtainSharedLock(&afs_xvcache,17); /* prevent others from creating this entry */
124 /* XXX Pay attention to afs_xvcache around the whole thing!! XXX */
126 tc = afs_Conn(&adp->fid, &treq, SHARED_LOCK);
128 hostp = tc->srvr->server;
129 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK);
130 if (adp->states & CForeign) {
132 #ifdef RX_ENABLE_LOCKS
134 #endif /* RX_ENABLE_LOCKS */
135 code = RXAFS_DFSSymlink(tc->id, (struct AFSFid *) &adp->fid.Fid, aname,
136 atargetName, &InStatus, (struct AFSFid *) &newFid.Fid,
137 &OutFidStatus, &OutDirStatus, &CallBack, &tsync);
138 #ifdef RX_ENABLE_LOCKS
140 #endif /* RX_ENABLE_LOCKS */
142 #ifdef RX_ENABLE_LOCKS
144 #endif /* RX_ENABLE_LOCKS */
145 code = RXAFS_Symlink(tc->id, (struct AFSFid *) &adp->fid.Fid, aname,
146 atargetName, &InStatus, (struct AFSFid *) &newFid.Fid,
147 &OutFidStatus, &OutDirStatus, &tsync);
148 #ifdef RX_ENABLE_LOCKS
150 #endif /* RX_ENABLE_LOCKS */
156 (afs_Analyze(tc, code, &adp->fid, &treq,
157 AFS_STATS_FS_RPCIDX_SYMLINK, SHARED_LOCK, (struct cell *)0));
159 UpgradeSToWLock(&afs_xvcache,40);
162 ObtainWriteLock(&afs_xcbhash, 499);
163 afs_DequeueCallback(adp);
164 adp->states &= ~CStatd;
165 ReleaseWriteLock(&afs_xcbhash);
166 osi_dnlc_purgedp(adp);
168 ReleaseWriteLock(&adp->lock);
169 ReleaseWriteLock(&afs_xvcache);
171 ReleaseWriteLock(&tdc->lock);
176 /* otherwise, we should see if we can make the change to the dir locally */
177 if (afs_LocalHero(adp, tdc, &OutDirStatus, 1)) {
178 /* we can do it locally */
179 code = afs_dir_Create(&tdc->f.inode, aname, &newFid.Fid);
181 ZapDCE(tdc); /* surprise error -- use invalid value */
186 ReleaseWriteLock(&tdc->lock);
189 newFid.Cell = adp->fid.Cell;
190 newFid.Fid.Volume = adp->fid.Fid.Volume;
191 ReleaseWriteLock(&adp->lock);
193 /* now we're done with parent dir, create the link's entry. Note that
194 * no one can get a pointer to the new cache entry until we release
195 * the xvcache lock. */
196 tvc = afs_NewVCache(&newFid, hostp, 1, WRITE_LOCK);
197 ObtainWriteLock(&tvc->lock,157);
198 ObtainWriteLock(&afs_xcbhash, 500);
199 tvc->states |= CStatd; /* have valid info */
200 tvc->states &= ~CBulkFetching;
202 if (adp->states & CForeign) {
203 tvc->states |= CForeign;
204 /* We don't have to worry about losing the callback since we're doing it
205 * under the afs_xvcache lock actually, afs_NewVCache may drop the
206 * afs_xvcache lock, if it calls afs_FlushVCache */
207 tvc->cbExpires = CallBack.ExpirationTime + now;
208 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp);
210 tvc->cbExpires = 0x7fffffff; /* never expires, they can't change */
211 /* since it never expires, we don't have to queue the callback */
213 ReleaseWriteLock(&afs_xcbhash);
214 afs_ProcessFS(tvc, &OutFidStatus, &treq);
216 if (!tvc->linkData) {
217 tvc->linkData = (char *) afs_osi_Alloc(alen);
218 strncpy(tvc->linkData, atargetName, alen-1);
219 tvc->linkData[alen-1] = 0;
221 ReleaseWriteLock(&tvc->lock);
222 ReleaseWriteLock(&afs_xvcache);
223 afs_PutVCache(tvc, WRITE_LOCK);
227 afs_PutVolume(volp, READ_LOCK);
228 code = afs_CheckCode(code, &treq, 31);
231 AFS_RELE(ndp->ni_dvp);
232 #endif /* AFS_OSF_ENV */
236 afs_MemHandleLink(avc, areq)
237 register struct vcache *avc;
238 struct vrequest *areq;
240 register struct dcache *tdc;
241 register char *tp, *rbuf;
242 afs_size_t offset, len;
243 afs_int32 tlen, alen;
244 register afs_int32 code;
246 AFS_STATCNT(afs_MemHandleLink);
247 /* two different formats, one for links protected 644, have a "." at
248 the end of the file name, which we turn into a null. Others,
249 protected 755, we add a null to the end of */
250 if (!avc->linkData) {
252 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
256 /* otherwise we have the data loaded, go for it */
261 if (avc->m.Mode & 0111) alen = len+1; /* regular link */
262 else alen = len; /* mt point */
263 rbuf = (char *) osi_AllocLargeSpace(AFS_LRALLOCSIZ);
264 ObtainReadLock(&tdc->lock);
265 addr = afs_MemCacheOpen(tdc->f.inode);
267 code = afs_MemReadBlk(addr, 0, rbuf, tlen);
268 afs_MemCacheClose(addr);
269 ReleaseReadLock(&tdc->lock);
272 alen = strlen(rbuf) + 1;
273 tp = afs_osi_Alloc(alen); /* make room for terminating null */
274 memcpy(tp, rbuf, alen);
275 osi_FreeLargeSpace(rbuf);
277 afs_osi_Free(tp, alen);
285 afs_UFSHandleLink(avc, areq)
286 register struct vcache *avc;
287 struct vrequest *areq;
289 register struct dcache *tdc;
290 register char *tp, *rbuf;
292 afs_size_t offset, len;
293 afs_int32 tlen, alen;
294 register afs_int32 code;
296 /* two different formats, one for links protected 644, have a "." at the end
297 of the file name, which we turn into a null. Others, protected 755,
298 we add a null to the end of */
299 AFS_STATCNT(afs_UFSHandleLink);
300 if (!avc->linkData) {
301 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
302 afs_Trace3(afs_iclSetp, CM_TRACE_UFSLINK, ICL_TYPE_POINTER, avc,
303 ICL_TYPE_POINTER, tdc,
304 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->m.Length));
308 /* otherwise we have the data loaded, go for it */
313 if (avc->m.Mode & 0111) alen = len+1; /* regular link */
314 else alen = len; /* mt point */
315 rbuf = (char *) osi_AllocLargeSpace(AFS_LRALLOCSIZ);
317 ObtainReadLock(&tdc->lock);
318 tfile = osi_UFSOpen (tdc->f.inode);
319 code = afs_osi_Read(tfile, -1, rbuf, tlen);
321 ReleaseReadLock(&tdc->lock);
324 alen = strlen(rbuf) + 1;
325 tp = afs_osi_Alloc(alen); /* make room for terminating null */
326 memcpy(tp, rbuf, alen);
327 osi_FreeLargeSpace(rbuf);
329 afs_osi_Free(tp, alen);
337 afs_readlink(OSI_VC_ARG(avc), auio, acred)
340 struct AFS_UCRED *acred;
342 register afs_int32 code;
343 struct vrequest treq;
347 AFS_STATCNT(afs_readlink);
348 afs_Trace1(afs_iclSetp, CM_TRACE_READLINK, ICL_TYPE_POINTER, avc);
349 if (code = afs_InitReq(&treq, acred)) return code;
350 code = afs_VerifyVCache(avc, &treq);
352 if (vType(avc) != VLNK) {
356 ObtainWriteLock(&avc->lock,158);
357 code = afs_HandleLink(avc, &treq);
358 /* finally uiomove it to user-land */
361 if (tp) AFS_UIOMOVE(tp, strlen(tp), UIO_READ, auio, code);
366 ReleaseWriteLock(&avc->lock);
368 code = afs_CheckCode(code, &treq, 32);