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 */
45 (OSI_VC_ARG(adp), aname, attrs, atargetName, acred)
50 struct AFS_UCRED *acred;
56 struct VenusFid newFid;
58 afs_size_t offset, len;
60 struct server *hostp = 0;
62 struct AFSStoreStatus InStatus;
63 struct AFSFetchStatus OutFidStatus, OutDirStatus;
64 struct AFSCallBack CallBack;
65 struct AFSVolSync tsync;
66 struct volume *volp = 0;
67 struct afs_fakestat_state fakestate;
71 AFS_STATCNT(afs_symlink);
72 afs_Trace2(afs_iclSetp, CM_TRACE_SYMLINK, ICL_TYPE_POINTER, adp,
73 ICL_TYPE_STRING, aname);
75 if ((code = afs_InitReq(&treq, acred)))
78 afs_InitFakeStat(&fakestate);
82 code = afs_EvalFakeStat(&adp, &fakestate, &treq);
86 if (strlen(aname) > AFSNAMEMAX || strlen(atargetName) > AFSPATHMAX) {
91 if (afs_IsDynroot(adp)) {
92 code = afs_DynrootVOPSymlink(adp, acred, aname, atargetName);
95 if (afs_IsDynrootMount(adp)) {
100 code = afs_VerifyVCache(adp, &treq);
102 code = afs_CheckCode(code, &treq, 30);
106 /** If the volume is read-only, return error without making an RPC to the
109 if (adp->states & CRO) {
114 if (AFS_IS_DISCONNECTED && !AFS_IS_LOGGING) {
119 InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE;
120 InStatus.ClientModTime = osi_Time();
121 alen = strlen(atargetName); /* we want it to include the null */
122 if (*atargetName == '#' || *atargetName == '%') {
123 InStatus.UnixModeBits = 0644; /* mt pt: null from "." at end */
125 alen++; /* Empty string */
127 InStatus.UnixModeBits = 0755;
128 alen++; /* add in the null */
130 tdc = afs_GetDCache(adp, (afs_size_t) 0, &treq, &offset, &len, 1);
131 volp = afs_FindVolume(&adp->fid, READ_LOCK); /*parent is also in same vol */
132 ObtainWriteLock(&adp->lock, 156);
134 ObtainWriteLock(&tdc->lock, 636);
135 ObtainSharedLock(&afs_xvcache, 17); /* prevent others from creating this entry */
136 /* XXX Pay attention to afs_xvcache around the whole thing!! XXX */
138 tc = afs_Conn(&adp->fid, &treq, SHARED_LOCK);
140 hostp = tc->srvr->server;
141 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK);
142 if (adp->states & CForeign) {
146 RXAFS_DFSSymlink(tc->id, (struct AFSFid *)&adp->fid.Fid,
147 aname, atargetName, &InStatus,
148 (struct AFSFid *)&newFid.Fid,
149 &OutFidStatus, &OutDirStatus, &CallBack,
155 RXAFS_Symlink(tc->id, (struct AFSFid *)&adp->fid.Fid,
156 aname, atargetName, &InStatus,
157 (struct AFSFid *)&newFid.Fid, &OutFidStatus,
158 &OutDirStatus, &tsync);
165 (tc, code, &adp->fid, &treq, AFS_STATS_FS_RPCIDX_SYMLINK,
168 UpgradeSToWLock(&afs_xvcache, 40);
171 ObtainWriteLock(&afs_xcbhash, 499);
172 afs_DequeueCallback(adp);
173 adp->states &= ~CStatd;
174 ReleaseWriteLock(&afs_xcbhash);
175 osi_dnlc_purgedp(adp);
177 ReleaseWriteLock(&adp->lock);
178 ReleaseWriteLock(&afs_xvcache);
180 ReleaseWriteLock(&tdc->lock);
185 /* otherwise, we should see if we can make the change to the dir locally */
186 if (afs_LocalHero(adp, tdc, &OutDirStatus, 1)) {
187 /* we can do it locally */
188 ObtainWriteLock(&afs_xdcache, 293);
189 code = afs_dir_Create(tdc, aname, &newFid.Fid);
190 ReleaseWriteLock(&afs_xdcache);
192 ZapDCE(tdc); /* surprise error -- use invalid value */
197 ReleaseWriteLock(&tdc->lock);
200 newFid.Cell = adp->fid.Cell;
201 newFid.Fid.Volume = adp->fid.Fid.Volume;
202 ReleaseWriteLock(&adp->lock);
204 /* now we're done with parent dir, create the link's entry. Note that
205 * no one can get a pointer to the new cache entry until we release
206 * the xvcache lock. */
207 tvc = afs_NewVCache(&newFid, hostp);
211 ReleaseWriteLock(&afs_xvcache);
214 ObtainWriteLock(&tvc->lock, 157);
215 ObtainWriteLock(&afs_xcbhash, 500);
216 tvc->states |= CStatd; /* have valid info */
217 tvc->states &= ~CBulkFetching;
219 if (adp->states & CForeign) {
220 tvc->states |= CForeign;
221 /* We don't have to worry about losing the callback since we're doing it
222 * under the afs_xvcache lock actually, afs_NewVCache may drop the
223 * afs_xvcache lock, if it calls afs_FlushVCache */
224 tvc->cbExpires = CallBack.ExpirationTime + now;
225 afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp);
227 tvc->cbExpires = 0x7fffffff; /* never expires, they can't change */
228 /* since it never expires, we don't have to queue the callback */
230 ReleaseWriteLock(&afs_xcbhash);
231 afs_ProcessFS(tvc, &OutFidStatus, &treq);
233 if (!tvc->linkData) {
234 tvc->linkData = (char *)afs_osi_Alloc(alen);
235 strncpy(tvc->linkData, atargetName, alen - 1);
236 tvc->linkData[alen - 1] = 0;
238 ReleaseWriteLock(&tvc->lock);
239 ReleaseWriteLock(&afs_xvcache);
243 afs_PutFakeStat(&fakestate);
245 afs_PutVolume(volp, READ_LOCK);
247 code = afs_CheckCode(code, &treq, 31);
253 afs_MemHandleLink(register struct vcache *avc, struct vrequest *areq)
255 register struct dcache *tdc;
256 register char *tp, *rbuf;
257 afs_size_t offset, len;
258 afs_int32 tlen, alen;
259 register afs_int32 code;
261 AFS_STATCNT(afs_MemHandleLink);
262 /* two different formats, one for links protected 644, have a "." at
263 * the end of the file name, which we turn into a null. Others,
264 * protected 755, we add a null to the end of */
265 if (!avc->linkData) {
267 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
271 /* otherwise we have the data loaded, go for it */
276 if (avc->m.Mode & 0111)
277 alen = len + 1; /* regular link */
279 alen = len; /* mt point */
280 rbuf = (char *)osi_AllocLargeSpace(AFS_LRALLOCSIZ);
281 ObtainReadLock(&tdc->lock);
282 addr = afs_MemCacheOpen(tdc->f.inode);
284 code = afs_MemReadBlk(addr, 0, rbuf, tlen);
285 afs_MemCacheClose(addr);
286 ReleaseReadLock(&tdc->lock);
289 alen = strlen(rbuf) + 1;
290 tp = afs_osi_Alloc(alen); /* make room for terminating null */
291 memcpy(tp, rbuf, alen);
292 osi_FreeLargeSpace(rbuf);
294 afs_osi_Free(tp, alen);
303 afs_UFSHandleLink(register struct vcache *avc, struct vrequest *areq)
305 register struct dcache *tdc;
306 register char *tp, *rbuf;
308 afs_size_t offset, len;
309 afs_int32 tlen, alen;
310 register afs_int32 code;
312 /* two different formats, one for links protected 644, have a "." at the
313 * end of the file name, which we turn into a null. Others, protected
314 * 755, we add a null to the end of */
315 AFS_STATCNT(afs_UFSHandleLink);
316 if (!avc->linkData) {
317 tdc = afs_GetDCache(avc, (afs_size_t) 0, areq, &offset, &len, 0);
318 afs_Trace3(afs_iclSetp, CM_TRACE_UFSLINK, ICL_TYPE_POINTER, avc,
319 ICL_TYPE_POINTER, tdc, ICL_TYPE_OFFSET,
320 ICL_HANDLE_OFFSET(avc->m.Length));
322 if (AFS_IS_DISCONNECTED)
327 /* otherwise we have the data loaded, go for it */
332 if (avc->m.Mode & 0111)
333 alen = len + 1; /* regular link */
335 alen = len; /* mt point */
336 rbuf = (char *)osi_AllocLargeSpace(AFS_LRALLOCSIZ);
338 ObtainReadLock(&tdc->lock);
339 tfile = osi_UFSOpen(tdc->f.inode);
340 code = afs_osi_Read(tfile, -1, rbuf, tlen);
342 ReleaseReadLock(&tdc->lock);
344 rbuf[alen - 1] = '\0';
345 alen = strlen(rbuf) + 1;
346 tp = afs_osi_Alloc(alen); /* make room for terminating null */
347 memcpy(tp, rbuf, alen);
348 osi_FreeLargeSpace(rbuf);
350 afs_osi_Free(tp, alen);
359 afs_readlink(OSI_VC_ARG(avc), auio, acred)
362 struct AFS_UCRED *acred;
364 register afs_int32 code;
365 struct vrequest treq;
367 struct afs_fakestat_state fakestat;
370 AFS_STATCNT(afs_readlink);
371 afs_Trace1(afs_iclSetp, CM_TRACE_READLINK, ICL_TYPE_POINTER, avc);
372 if ((code = afs_InitReq(&treq, acred)))
374 afs_InitFakeStat(&fakestat);
378 code = afs_EvalFakeStat(&avc, &fakestat, &treq);
381 code = afs_VerifyVCache(avc, &treq);
384 if (vType(avc) != VLNK) {
388 ObtainWriteLock(&avc->lock, 158);
389 code = afs_HandleLink(avc, &treq);
390 /* finally uiomove it to user-land */
394 AFS_UIOMOVE(tp, strlen(tp), UIO_READ, auio, code);
399 ReleaseWriteLock(&avc->lock);
401 afs_PutFakeStat(&fakestat);
403 code = afs_CheckCode(code, &treq, 32);