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 return afs_DynrootVOPSymlink(adp, acred, aname, atargetName);
85 if (code = afs_InitReq(&treq, acred))
88 code = afs_VerifyVCache(adp, &treq);
90 code = afs_CheckCode(code, &treq, 30);
94 /** If the volume is read-only, return error without making an RPC to the
97 if ( adp->states & CRO ) {
102 InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE;
103 InStatus.ClientModTime = osi_Time();
104 alen = strlen(atargetName); /* we want it to include the null */
105 if (*atargetName == '#' || *atargetName == '%') {
106 InStatus.UnixModeBits = 0644; /* mt pt: null from "." at end */
107 if (alen == 1) alen++; /* Empty string */
109 InStatus.UnixModeBits = 0755;
110 alen++; /* add in the null */
112 tdc = afs_GetDCache(adp, (afs_size_t) 0, &treq, &offset, &len, 1);
113 volp = afs_FindVolume(&adp->fid, READ_LOCK); /*parent is also in same vol*/
114 ObtainWriteLock(&adp->lock,156);
115 ObtainSharedLock(&afs_xvcache,17); /* prevent others from creating this entry */
116 /* XXX Pay attention to afs_xvcache around the whole thing!! XXX */
118 tc = afs_Conn(&adp->fid, &treq, SHARED_LOCK);
120 hostp = tc->srvr->server;
121 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK);
122 if (adp->states & CForeign) {
124 #ifdef RX_ENABLE_LOCKS
126 #endif /* RX_ENABLE_LOCKS */
127 code = RXAFS_DFSSymlink(tc->id, (struct AFSFid *) &adp->fid.Fid, aname,
128 atargetName, &InStatus, (struct AFSFid *) &newFid.Fid,
129 &OutFidStatus, &OutDirStatus, &CallBack, &tsync);
130 #ifdef RX_ENABLE_LOCKS
132 #endif /* RX_ENABLE_LOCKS */
134 #ifdef RX_ENABLE_LOCKS
136 #endif /* RX_ENABLE_LOCKS */
137 code = RXAFS_Symlink(tc->id, (struct AFSFid *) &adp->fid.Fid, aname,
138 atargetName, &InStatus, (struct AFSFid *) &newFid.Fid,
139 &OutFidStatus, &OutDirStatus, &tsync);
140 #ifdef RX_ENABLE_LOCKS
142 #endif /* RX_ENABLE_LOCKS */
148 (afs_Analyze(tc, code, &adp->fid, &treq,
149 AFS_STATS_FS_RPCIDX_SYMLINK, SHARED_LOCK, (struct cell *)0));
151 UpgradeSToWLock(&afs_xvcache,40);
154 ObtainWriteLock(&afs_xcbhash, 499);
155 afs_DequeueCallback(adp);
156 adp->states &= ~CStatd;
157 ReleaseWriteLock(&afs_xcbhash);
158 osi_dnlc_purgedp(adp);
160 ReleaseWriteLock(&adp->lock);
161 ReleaseWriteLock(&afs_xvcache);
162 if (tdc) afs_PutDCache(tdc);
165 /* otherwise, we should see if we can make the change to the dir locally */
166 if (afs_LocalHero(adp, tdc, &OutDirStatus, 1)) {
167 /* we can do it locally */
168 code = afs_dir_Create(&tdc->f.inode, aname, &newFid.Fid);
170 ZapDCE(tdc); /* surprise error -- use invalid value */
177 newFid.Cell = adp->fid.Cell;
178 newFid.Fid.Volume = adp->fid.Fid.Volume;
179 ReleaseWriteLock(&adp->lock);
181 /* now we're done with parent dir, create the link's entry. Note that
182 * no one can get a pointer to the new cache entry until we release
183 * the xvcache lock. */
184 tvc = afs_NewVCache(&newFid, hostp, 1, WRITE_LOCK);
185 ObtainWriteLock(&tvc->lock,157);
186 ObtainWriteLock(&afs_xcbhash, 500);
187 tvc->states |= CStatd; /* have valid info */
188 tvc->states &= ~CBulkFetching;
190 if (adp->states & CForeign) {
191 tvc->states |= CForeign;
192 /* We don't have to worry about losing the callback since we're doing it
193 * under the afs_xvcache lock actually, afs_NewVCache may drop the
194 * afs_xvcache lock, if it calls afs_FlushVCache */
195 tvc->cbExpires = CallBack.ExpirationTime + now;
196 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp);
198 tvc->cbExpires = 0x7fffffff; /* never expires, they can't change */
199 /* since it never expires, we don't have to queue the callback */
201 ReleaseWriteLock(&afs_xcbhash);
202 afs_ProcessFS(tvc, &OutFidStatus, &treq);
204 if (!tvc->linkData) {
205 tvc->linkData = (char *) afs_osi_Alloc(alen);
206 strncpy(tvc->linkData, atargetName, alen-1);
207 tvc->linkData[alen-1] = 0;
209 ReleaseWriteLock(&tvc->lock);
210 ReleaseWriteLock(&afs_xvcache);
211 afs_PutVCache(tvc, WRITE_LOCK);
215 AFS_RELE(ndp->ni_dvp);
216 #endif /* AFS_OSF_ENV */
218 afs_PutVolume(volp, READ_LOCK);
219 code = afs_CheckCode(code, &treq, 31);
223 afs_MemHandleLink(avc, areq)
224 register struct vcache *avc;
225 struct vrequest *areq;
227 register struct dcache *tdc;
229 afs_size_t offset, len;
230 afs_int32 tlen, alen;
231 register afs_int32 code;
233 AFS_STATCNT(afs_MemHandleLink);
234 /* two different formats, one for links protected 644, have a "." at
235 the end of the file name, which we turn into a null. Others,
236 protected 755, we add a null to the end of */
237 if (!avc->linkData) {
239 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
243 /* otherwise we have the data loaded, go for it */
248 if (avc->m.Mode & 0111) alen = len+1; /* regular link */
249 else alen = len; /* mt point */
250 tp = afs_osi_Alloc(alen); /* make room for terminating null */
251 addr = afs_MemCacheOpen(tdc->f.inode);
253 code = afs_MemReadBlk(addr, 0, tp, tlen);
257 afs_osi_Free(tp, alen);
265 afs_UFSHandleLink(avc, areq)
266 register struct vcache *avc;
267 struct vrequest *areq;
269 register struct dcache *tdc;
272 afs_size_t offset, len;
273 afs_int32 tlen, alen;
274 register afs_int32 code;
276 /* two different formats, one for links protected 644, have a "." at the end
277 of the file name, which we turn into a null. Others, protected 755,
278 we add a null to the end of */
279 AFS_STATCNT(afs_UFSHandleLink);
280 if (!avc->linkData) {
281 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
282 afs_Trace3(afs_iclSetp, CM_TRACE_UFSLINK, ICL_TYPE_POINTER, avc,
283 ICL_TYPE_POINTER, tdc,
284 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->m.Length));
288 /* otherwise we have the data loaded, go for it */
293 tfile = osi_UFSOpen (tdc->f.inode);
294 if (avc->m.Mode & 0111) alen = len+1; /* regular link */
295 else alen = len; /* mt point */
296 tp = afs_osi_Alloc(alen); /* make room for terminating null */
298 code = afs_osi_Read(tfile, -1, tp, tlen);
303 afs_osi_Free(tp, alen);
311 afs_readlink(OSI_VC_ARG(avc), auio, acred)
314 struct AFS_UCRED *acred;
316 register afs_int32 code;
317 struct vrequest treq;
321 AFS_STATCNT(afs_readlink);
322 afs_Trace1(afs_iclSetp, CM_TRACE_READLINK, ICL_TYPE_POINTER, avc);
323 if (code = afs_InitReq(&treq, acred)) return code;
324 code = afs_VerifyVCache(avc, &treq);
326 if (vType(avc) != VLNK) {
330 ObtainWriteLock(&avc->lock,158);
331 code = afs_HandleLink(avc, &treq);
332 /* finally uiomove it to user-land */
335 if (tp) AFS_UIOMOVE(tp, strlen(tp), UIO_READ, auio, code);
340 ReleaseWriteLock(&avc->lock);
342 code = afs_CheckCode(code, &treq, 32);