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);
81 if (code = afs_InitReq(&treq, acred))
84 code = afs_VerifyVCache(adp, &treq);
86 code = afs_CheckCode(code, &treq, 30);
90 /** If the volume is read-only, return error without making an RPC to the
93 if ( adp->states & CRO ) {
98 InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE;
99 InStatus.ClientModTime = osi_Time();
100 alen = strlen(atargetName); /* we want it to include the null */
101 if (*atargetName == '#' || *atargetName == '%') {
102 InStatus.UnixModeBits = 0644; /* mt pt: null from "." at end */
103 if (alen == 1) alen++; /* Empty string */
105 InStatus.UnixModeBits = 0755;
106 alen++; /* add in the null */
108 tdc = afs_GetDCache(adp, (afs_size_t) 0, &treq, &offset, &len, 1);
109 volp = afs_FindVolume(&adp->fid, READ_LOCK); /*parent is also in same vol*/
110 ObtainWriteLock(&adp->lock,156);
111 ObtainSharedLock(&afs_xvcache,17); /* prevent others from creating this entry */
112 /* XXX Pay attention to afs_xvcache around the whole thing!! XXX */
114 tc = afs_Conn(&adp->fid, &treq, SHARED_LOCK);
116 hostp = tc->srvr->server;
117 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK);
118 if (adp->states & CForeign) {
120 #ifdef RX_ENABLE_LOCKS
122 #endif /* RX_ENABLE_LOCKS */
123 code = RXAFS_DFSSymlink(tc->id, (struct AFSFid *) &adp->fid.Fid, aname,
124 atargetName, &InStatus, (struct AFSFid *) &newFid.Fid,
125 &OutFidStatus, &OutDirStatus, &CallBack, &tsync);
126 #ifdef RX_ENABLE_LOCKS
128 #endif /* RX_ENABLE_LOCKS */
130 #ifdef RX_ENABLE_LOCKS
132 #endif /* RX_ENABLE_LOCKS */
133 code = RXAFS_Symlink(tc->id, (struct AFSFid *) &adp->fid.Fid, aname,
134 atargetName, &InStatus, (struct AFSFid *) &newFid.Fid,
135 &OutFidStatus, &OutDirStatus, &tsync);
136 #ifdef RX_ENABLE_LOCKS
138 #endif /* RX_ENABLE_LOCKS */
144 (afs_Analyze(tc, code, &adp->fid, &treq,
145 AFS_STATS_FS_RPCIDX_SYMLINK, SHARED_LOCK, (struct cell *)0));
147 UpgradeSToWLock(&afs_xvcache,40);
150 ObtainWriteLock(&afs_xcbhash, 499);
151 afs_DequeueCallback(adp);
152 adp->states &= ~CStatd;
153 ReleaseWriteLock(&afs_xcbhash);
154 osi_dnlc_purgedp(adp);
156 ReleaseWriteLock(&adp->lock);
157 ReleaseWriteLock(&afs_xvcache);
158 if (tdc) afs_PutDCache(tdc);
161 /* otherwise, we should see if we can make the change to the dir locally */
162 if (afs_LocalHero(adp, tdc, &OutDirStatus, 1)) {
163 /* we can do it locally */
164 code = afs_dir_Create(&tdc->f.inode, aname, &newFid.Fid);
166 ZapDCE(tdc); /* surprise error -- use invalid value */
173 newFid.Cell = adp->fid.Cell;
174 newFid.Fid.Volume = adp->fid.Fid.Volume;
175 ReleaseWriteLock(&adp->lock);
177 /* now we're done with parent dir, create the link's entry. Note that
178 * no one can get a pointer to the new cache entry until we release
179 * the xvcache lock. */
180 tvc = afs_NewVCache(&newFid, hostp, 1, WRITE_LOCK);
181 ObtainWriteLock(&tvc->lock,157);
182 ObtainWriteLock(&afs_xcbhash, 500);
183 tvc->states |= CStatd; /* have valid info */
184 tvc->states &= ~CBulkFetching;
186 if (adp->states & CForeign) {
187 tvc->states |= CForeign;
188 /* We don't have to worry about losing the callback since we're doing it
189 * under the afs_xvcache lock actually, afs_NewVCache may drop the
190 * afs_xvcache lock, if it calls afs_FlushVCache */
191 tvc->cbExpires = CallBack.ExpirationTime + now;
192 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp);
194 tvc->cbExpires = 0x7fffffff; /* never expires, they can't change */
195 /* since it never expires, we don't have to queue the callback */
197 ReleaseWriteLock(&afs_xcbhash);
198 afs_ProcessFS(tvc, &OutFidStatus, &treq);
200 if (!tvc->linkData) {
201 tvc->linkData = (char *) afs_osi_Alloc(alen);
202 strncpy(tvc->linkData, atargetName, alen-1);
203 tvc->linkData[alen-1] = 0;
205 ReleaseWriteLock(&tvc->lock);
206 ReleaseWriteLock(&afs_xvcache);
207 afs_PutVCache(tvc, WRITE_LOCK);
211 AFS_RELE(ndp->ni_dvp);
212 #endif /* AFS_OSF_ENV */
214 afs_PutVolume(volp, READ_LOCK);
215 code = afs_CheckCode(code, &treq, 31);
219 afs_MemHandleLink(avc, areq)
220 register struct vcache *avc;
221 struct vrequest *areq;
223 register struct dcache *tdc;
225 afs_size_t offset, len;
226 afs_int32 tlen, alen;
227 register afs_int32 code;
229 AFS_STATCNT(afs_MemHandleLink);
230 /* two different formats, one for links protected 644, have a "." at
231 the end of the file name, which we turn into a null. Others,
232 protected 755, we add a null to the end of */
233 if (!avc->linkData) {
235 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
239 /* otherwise we have the data loaded, go for it */
244 if (avc->m.Mode & 0111) alen = len+1; /* regular link */
245 else alen = len; /* mt point */
246 tp = afs_osi_Alloc(alen); /* make room for terminating null */
247 addr = afs_MemCacheOpen(tdc->f.inode);
249 code = afs_MemReadBlk(addr, 0, tp, tlen);
253 afs_osi_Free(tp, alen);
261 afs_UFSHandleLink(avc, areq)
262 register struct vcache *avc;
263 struct vrequest *areq;
265 register struct dcache *tdc;
268 afs_size_t offset, len;
269 afs_int32 tlen, alen;
270 register afs_int32 code;
272 /* two different formats, one for links protected 644, have a "." at the end
273 of the file name, which we turn into a null. Others, protected 755,
274 we add a null to the end of */
275 AFS_STATCNT(afs_UFSHandleLink);
276 if (!avc->linkData) {
277 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
278 afs_Trace3(afs_iclSetp, CM_TRACE_UFSLINK, ICL_TYPE_POINTER, avc,
279 ICL_TYPE_POINTER, tdc,
280 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->m.Length));
284 /* otherwise we have the data loaded, go for it */
289 tfile = osi_UFSOpen (tdc->f.inode);
290 if (avc->m.Mode & 0111) alen = len+1; /* regular link */
291 else alen = len; /* mt point */
292 tp = afs_osi_Alloc(alen); /* make room for terminating null */
294 code = afs_osi_Read(tfile, -1, tp, tlen);
299 afs_osi_Free(tp, alen);
307 afs_readlink(OSI_VC_ARG(avc), auio, acred)
310 struct AFS_UCRED *acred;
312 register afs_int32 code;
313 struct vrequest treq;
317 AFS_STATCNT(afs_readlink);
318 afs_Trace1(afs_iclSetp, CM_TRACE_READLINK, ICL_TYPE_POINTER, avc);
319 if (code = afs_InitReq(&treq, acred)) return code;
320 code = afs_VerifyVCache(avc, &treq);
322 if (vType(avc) != VLNK) {
326 ObtainWriteLock(&avc->lock,158);
327 code = afs_HandleLink(avc, &treq);
328 /* finally uiomove it to user-land */
331 if (tp) AFS_UIOMOVE(tp, strlen(tp), UIO_READ, auio, code);
336 ReleaseWriteLock(&avc->lock);
338 code = afs_CheckCode(code, &treq, 32);