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 (afs_IsDynroot(adp)) {
83 code = afs_DynrootVOPSymlink(adp, acred, aname, atargetName);
87 if (code = afs_InitReq(&treq, acred))
90 code = afs_VerifyVCache(adp, &treq);
92 code = afs_CheckCode(code, &treq, 30);
96 /** If the volume is read-only, return error without making an RPC to the
99 if ( adp->states & CRO ) {
104 InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE;
105 InStatus.ClientModTime = osi_Time();
106 alen = strlen(atargetName); /* we want it to include the null */
107 if (*atargetName == '#' || *atargetName == '%') {
108 InStatus.UnixModeBits = 0644; /* mt pt: null from "." at end */
109 if (alen == 1) alen++; /* Empty string */
111 InStatus.UnixModeBits = 0755;
112 alen++; /* add in the null */
114 tdc = afs_GetDCache(adp, (afs_size_t) 0, &treq, &offset, &len, 1);
115 volp = afs_FindVolume(&adp->fid, READ_LOCK); /*parent is also in same vol*/
116 ObtainWriteLock(&adp->lock,156);
117 ObtainWriteLock(&tdc->lock, 636);
118 ObtainSharedLock(&afs_xvcache,17); /* prevent others from creating this entry */
119 /* XXX Pay attention to afs_xvcache around the whole thing!! XXX */
121 tc = afs_Conn(&adp->fid, &treq, SHARED_LOCK);
123 hostp = tc->srvr->server;
124 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK);
125 if (adp->states & CForeign) {
127 #ifdef RX_ENABLE_LOCKS
129 #endif /* RX_ENABLE_LOCKS */
130 code = RXAFS_DFSSymlink(tc->id, (struct AFSFid *) &adp->fid.Fid, aname,
131 atargetName, &InStatus, (struct AFSFid *) &newFid.Fid,
132 &OutFidStatus, &OutDirStatus, &CallBack, &tsync);
133 #ifdef RX_ENABLE_LOCKS
135 #endif /* RX_ENABLE_LOCKS */
137 #ifdef RX_ENABLE_LOCKS
139 #endif /* RX_ENABLE_LOCKS */
140 code = RXAFS_Symlink(tc->id, (struct AFSFid *) &adp->fid.Fid, aname,
141 atargetName, &InStatus, (struct AFSFid *) &newFid.Fid,
142 &OutFidStatus, &OutDirStatus, &tsync);
143 #ifdef RX_ENABLE_LOCKS
145 #endif /* RX_ENABLE_LOCKS */
151 (afs_Analyze(tc, code, &adp->fid, &treq,
152 AFS_STATS_FS_RPCIDX_SYMLINK, SHARED_LOCK, (struct cell *)0));
154 UpgradeSToWLock(&afs_xvcache,40);
157 ObtainWriteLock(&afs_xcbhash, 499);
158 afs_DequeueCallback(adp);
159 adp->states &= ~CStatd;
160 ReleaseWriteLock(&afs_xcbhash);
161 osi_dnlc_purgedp(adp);
163 ReleaseWriteLock(&adp->lock);
164 ReleaseWriteLock(&afs_xvcache);
166 ReleaseWriteLock(&tdc->lock);
171 /* otherwise, we should see if we can make the change to the dir locally */
172 if (afs_LocalHero(adp, tdc, &OutDirStatus, 1)) {
173 /* we can do it locally */
174 code = afs_dir_Create(&tdc->f.inode, aname, &newFid.Fid);
176 ZapDCE(tdc); /* surprise error -- use invalid value */
181 ReleaseWriteLock(&tdc->lock);
184 newFid.Cell = adp->fid.Cell;
185 newFid.Fid.Volume = adp->fid.Fid.Volume;
186 ReleaseWriteLock(&adp->lock);
188 /* now we're done with parent dir, create the link's entry. Note that
189 * no one can get a pointer to the new cache entry until we release
190 * the xvcache lock. */
191 tvc = afs_NewVCache(&newFid, hostp, 1, WRITE_LOCK);
192 ObtainWriteLock(&tvc->lock,157);
193 ObtainWriteLock(&afs_xcbhash, 500);
194 tvc->states |= CStatd; /* have valid info */
195 tvc->states &= ~CBulkFetching;
197 if (adp->states & CForeign) {
198 tvc->states |= CForeign;
199 /* We don't have to worry about losing the callback since we're doing it
200 * under the afs_xvcache lock actually, afs_NewVCache may drop the
201 * afs_xvcache lock, if it calls afs_FlushVCache */
202 tvc->cbExpires = CallBack.ExpirationTime + now;
203 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp);
205 tvc->cbExpires = 0x7fffffff; /* never expires, they can't change */
206 /* since it never expires, we don't have to queue the callback */
208 ReleaseWriteLock(&afs_xcbhash);
209 afs_ProcessFS(tvc, &OutFidStatus, &treq);
211 if (!tvc->linkData) {
212 tvc->linkData = (char *) afs_osi_Alloc(alen);
213 strncpy(tvc->linkData, atargetName, alen-1);
214 tvc->linkData[alen-1] = 0;
216 ReleaseWriteLock(&tvc->lock);
217 ReleaseWriteLock(&afs_xvcache);
218 afs_PutVCache(tvc, WRITE_LOCK);
222 afs_PutVolume(volp, READ_LOCK);
223 code = afs_CheckCode(code, &treq, 31);
226 AFS_RELE(ndp->ni_dvp);
227 #endif /* AFS_OSF_ENV */
231 afs_MemHandleLink(avc, areq)
232 register struct vcache *avc;
233 struct vrequest *areq;
235 register struct dcache *tdc;
236 register char *tp, *rbuf;
237 afs_size_t offset, len;
238 afs_int32 tlen, alen;
239 register afs_int32 code;
241 AFS_STATCNT(afs_MemHandleLink);
242 /* two different formats, one for links protected 644, have a "." at
243 the end of the file name, which we turn into a null. Others,
244 protected 755, we add a null to the end of */
245 if (!avc->linkData) {
247 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
251 /* otherwise we have the data loaded, go for it */
256 if (avc->m.Mode & 0111) alen = len+1; /* regular link */
257 else alen = len; /* mt point */
258 rbuf = (char *) osi_AllocLargeSpace(AFS_LRALLOCSIZ);
259 ObtainReadLock(&tdc->lock);
260 addr = afs_MemCacheOpen(tdc->f.inode);
262 code = afs_MemReadBlk(addr, 0, rbuf, tlen);
263 afs_MemCacheClose(addr);
264 ReleaseReadLock(&tdc->lock);
267 alen = strlen(rbuf) + 1;
268 tp = afs_osi_Alloc(alen); /* make room for terminating null */
269 memcpy(tp, rbuf, alen);
270 osi_FreeLargeSpace(rbuf);
272 afs_osi_Free(tp, alen);
280 afs_UFSHandleLink(avc, areq)
281 register struct vcache *avc;
282 struct vrequest *areq;
284 register struct dcache *tdc;
285 register char *tp, *rbuf;
287 afs_size_t offset, len;
288 afs_int32 tlen, alen;
289 register afs_int32 code;
291 /* two different formats, one for links protected 644, have a "." at the end
292 of the file name, which we turn into a null. Others, protected 755,
293 we add a null to the end of */
294 AFS_STATCNT(afs_UFSHandleLink);
295 if (!avc->linkData) {
296 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
297 afs_Trace3(afs_iclSetp, CM_TRACE_UFSLINK, ICL_TYPE_POINTER, avc,
298 ICL_TYPE_POINTER, tdc,
299 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->m.Length));
303 /* otherwise we have the data loaded, go for it */
308 if (avc->m.Mode & 0111) alen = len+1; /* regular link */
309 else alen = len; /* mt point */
310 rbuf = (char *) osi_AllocLargeSpace(AFS_LRALLOCSIZ);
312 ObtainReadLock(&tdc->lock);
313 tfile = osi_UFSOpen (tdc->f.inode);
314 code = afs_osi_Read(tfile, -1, rbuf, tlen);
316 ReleaseReadLock(&tdc->lock);
319 alen = strlen(rbuf) + 1;
320 tp = afs_osi_Alloc(alen); /* make room for terminating null */
321 memcpy(tp, rbuf, alen);
322 osi_FreeLargeSpace(rbuf);
324 afs_osi_Free(tp, alen);
332 afs_readlink(OSI_VC_ARG(avc), auio, acred)
335 struct AFS_UCRED *acred;
337 register afs_int32 code;
338 struct vrequest treq;
342 AFS_STATCNT(afs_readlink);
343 afs_Trace1(afs_iclSetp, CM_TRACE_READLINK, ICL_TYPE_POINTER, avc);
344 if (code = afs_InitReq(&treq, acred)) return code;
345 code = afs_VerifyVCache(avc, &treq);
347 if (vType(avc) != VLNK) {
351 ObtainWriteLock(&avc->lock,158);
352 code = afs_HandleLink(avc, &treq);
353 /* finally uiomove it to user-land */
356 if (tp) AFS_UIOMOVE(tp, strlen(tp), UIO_READ, auio, code);
361 ReleaseWriteLock(&avc->lock);
363 code = afs_CheckCode(code, &treq, 32);