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"
25 #include "afs/sysincludes.h" /* Standard vendor system headers */
26 #include "afsincludes.h" /* Afs-based standard headers */
27 #include "afs/afs_stats.h" /* statistics */
28 #include "afs/afs_cbqueue.h"
29 #include "afs/nfsclient.h"
30 #include "afs/afs_osidnlc.h"
32 extern afs_rwlock_t afs_xvcache
;
33 extern afs_rwlock_t afs_xcbhash
;
35 /* Note: There is the bare bones beginning of symlink hints in the now
36 * defunct afs/afs_lookup.c file. Since they are not in use, making the call
37 * is just a performance hit.
41 afs_DisconCreateSymlink(struct vcache
*avc
, char *aname
,
42 struct vrequest
*areq
) {
44 struct osi_file
*tfile
;
45 afs_size_t offset
, len
;
47 tdc
= afs_GetDCache(avc
, 0, areq
, &offset
, &len
, 0);
49 /* printf("afs_DisconCreateSymlink: can't get new dcache for symlink.\n"); */
54 avc
->f
.m
.Length
= len
;
56 ObtainWriteLock(&tdc
->lock
, 720);
57 afs_AdjustSize(tdc
, len
);
59 tfile
= afs_CFileOpen(&tdc
->f
.inode
);
61 afs_CFileWrite(tfile
, 0, aname
, len
);
62 afs_CFileClose(tfile
);
63 ReleaseWriteLock(&tdc
->lock
);
67 /* don't set CDirty in here because RPC is called synchronously */
69 afs_symlink(OSI_VC_DECL(adp
), char *aname
, struct vattr
*attrs
,
70 char *atargetName
, struct vcache
**tvcp
, afs_ucred_t
*acred
)
73 struct vrequest
*treq
= NULL
;
76 struct VenusFid newFid
;
78 afs_size_t offset
, len
;
80 struct server
*hostp
= 0;
82 struct AFSStoreStatus InStatus
;
83 struct AFSFetchStatus
*OutFidStatus
, *OutDirStatus
;
84 struct AFSCallBack CallBack
;
85 struct AFSVolSync tsync
;
86 struct volume
*volp
= 0;
87 struct afs_fakestat_state fakestate
;
88 struct rx_connection
*rxconn
;
92 AFS_STATCNT(afs_symlink
);
93 afs_Trace2(afs_iclSetp
, CM_TRACE_SYMLINK
, ICL_TYPE_POINTER
, adp
,
94 ICL_TYPE_STRING
, aname
);
96 OutFidStatus
= osi_AllocSmallSpace(sizeof(struct AFSFetchStatus
));
97 OutDirStatus
= osi_AllocSmallSpace(sizeof(struct AFSFetchStatus
));
98 memset(&InStatus
, 0, sizeof(InStatus
));
100 if ((code
= afs_CreateReq(&treq
, acred
)))
103 afs_InitFakeStat(&fakestate
);
107 code
= afs_EvalFakeStat(&adp
, &fakestate
, treq
);
111 if (strlen(aname
) > AFSNAMEMAX
|| strlen(atargetName
) > AFSPATHMAX
) {
116 if (afs_IsDynroot(adp
)) {
117 code
= afs_DynrootVOPSymlink(adp
, acred
, aname
, atargetName
);
120 if (afs_IsDynrootMount(adp
)) {
125 code
= afs_VerifyVCache(adp
, treq
);
127 code
= afs_CheckCode(code
, treq
, 30);
131 /** If the volume is read-only, return error without making an RPC to the
134 if (adp
->f
.states
& CRO
) {
139 if (AFS_IS_DISCONNECTED
&& !AFS_IS_DISCON_RW
) {
144 InStatus
.Mask
= AFS_SETMODTIME
| AFS_SETMODE
;
145 InStatus
.ClientModTime
= osi_Time();
146 alen
= strlen(atargetName
); /* we want it to include the null */
147 if ( (*atargetName
== '#' || *atargetName
== '%') && alen
> 1 && atargetName
[alen
-1] == '.') {
148 InStatus
.UnixModeBits
= 0644; /* mt pt: null from "." at end */
150 alen
++; /* Empty string */
152 InStatus
.UnixModeBits
= 0755;
153 alen
++; /* add in the null */
155 tdc
= afs_GetDCache(adp
, (afs_size_t
) 0, treq
, &offset
, &len
, 1);
156 volp
= afs_FindVolume(&adp
->f
.fid
, READ_LOCK
); /*parent is also in same vol */
157 ObtainWriteLock(&adp
->lock
, 156);
159 ObtainWriteLock(&tdc
->lock
, 636);
160 /* No further locks: if the SymLink succeeds, it does not matter what happens
161 * to our local copy of the directory. If somebody tampers with it in the meantime,
162 * the copy will be invalidated */
163 if (!AFS_IS_DISCON_RW
) {
165 tc
= afs_Conn(&adp
->f
.fid
, treq
, SHARED_LOCK
, &rxconn
);
167 hostp
= tc
->parent
->srvr
->server
;
168 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK
);
169 if (adp
->f
.states
& CForeign
) {
173 RXAFS_DFSSymlink(rxconn
,
174 (struct AFSFid
*)&adp
->f
.fid
.Fid
,
175 aname
, atargetName
, &InStatus
,
176 (struct AFSFid
*)&newFid
.Fid
,
177 OutFidStatus
, OutDirStatus
,
183 RXAFS_Symlink(rxconn
, (struct AFSFid
*)&adp
->f
.fid
.Fid
,
184 aname
, atargetName
, &InStatus
,
185 (struct AFSFid
*)&newFid
.Fid
,
186 OutFidStatus
, OutDirStatus
, &tsync
);
193 (tc
, rxconn
, code
, &adp
->f
.fid
, treq
, AFS_STATS_FS_RPCIDX_SYMLINK
,
196 newFid
.Cell
= adp
->f
.fid
.Cell
;
197 newFid
.Fid
.Volume
= adp
->f
.fid
.Fid
.Volume
;
198 afs_GenFakeFid(&newFid
, VREG
, 0);
201 ObtainWriteLock(&afs_xvcache
, 40);
204 afs_StaleVCache(adp
);
206 ReleaseWriteLock(&adp
->lock
);
207 ReleaseWriteLock(&afs_xvcache
);
209 ReleaseWriteLock(&tdc
->lock
);
214 /* otherwise, we should see if we can make the change to the dir locally */
215 if (AFS_IS_DISCON_RW
|| afs_LocalHero(adp
, tdc
, OutDirStatus
, 1)) {
216 /* we can do it locally */
217 ObtainWriteLock(&afs_xdcache
, 293);
218 /* If the following fails because the name has been created in the meantime, the
219 * directory is out-of-date - the file server knows best! */
220 code
= afs_dir_Create(tdc
, aname
, &newFid
.Fid
);
221 ReleaseWriteLock(&afs_xdcache
);
222 if (code
&& !AFS_IS_DISCON_RW
) {
223 ZapDCE(tdc
); /* surprise error -- use invalid value */
228 ReleaseWriteLock(&tdc
->lock
);
231 newFid
.Cell
= adp
->f
.fid
.Cell
;
232 newFid
.Fid
.Volume
= adp
->f
.fid
.Fid
.Volume
;
233 ReleaseWriteLock(&adp
->lock
);
235 /* now we're done with parent dir, create the link's entry. Note that
236 * no one can get a pointer to the new cache entry until we release
237 * the xvcache lock. */
238 tvc
= afs_NewVCache(&newFid
, hostp
);
242 ReleaseWriteLock(&afs_xvcache
);
245 ObtainWriteLock(&tvc
->lock
, 157);
246 ObtainWriteLock(&afs_xcbhash
, 500);
247 tvc
->f
.states
|= CStatd
; /* have valid info */
248 tvc
->f
.states
&= ~CBulkFetching
;
250 if (adp
->f
.states
& CForeign
) {
251 tvc
->f
.states
|= CForeign
;
252 /* We don't have to worry about losing the callback since we're doing it
253 * under the afs_xvcache lock actually, afs_NewVCache may drop the
254 * afs_xvcache lock, if it calls afs_FlushVCache */
255 tvc
->cbExpires
= CallBack
.ExpirationTime
+ now
;
256 afs_QueueCallback(tvc
, CBHash(CallBack
.ExpirationTime
), volp
);
258 tvc
->cbExpires
= 0x7fffffff; /* never expires, they can't change */
259 /* since it never expires, we don't have to queue the callback */
261 ReleaseWriteLock(&afs_xcbhash
);
263 if (AFS_IS_DISCON_RW
) {
264 attrs
->va_mode
= InStatus
.UnixModeBits
;
265 afs_GenDisconStatus(adp
, tvc
, &newFid
, attrs
, treq
, VLNK
);
266 code
= afs_DisconCreateSymlink(tvc
, atargetName
, treq
);
268 /* XXX - When this goes wrong, we need to tidy up the changes we made to
269 * the parent, and get rid of the vcache we just created */
270 ReleaseWriteLock(&tvc
->lock
);
271 ReleaseWriteLock(&afs_xvcache
);
275 afs_DisconAddDirty(tvc
, VDisconCreate
, 0);
277 afs_ProcessFS(tvc
, OutFidStatus
, treq
);
280 if (!tvc
->linkData
) {
281 tvc
->linkData
= afs_osi_Alloc(alen
);
282 osi_Assert(tvc
->linkData
!= NULL
);
283 strncpy(tvc
->linkData
, atargetName
, alen
- 1);
284 tvc
->linkData
[alen
- 1] = 0;
286 ReleaseWriteLock(&tvc
->lock
);
287 ReleaseWriteLock(&afs_xvcache
);
294 afs_PutFakeStat(&fakestate
);
296 afs_PutVolume(volp
, READ_LOCK
);
298 code
= afs_CheckCode(code
, treq
, 31);
299 afs_DestroyReq(treq
);
301 osi_FreeSmallSpace(OutFidStatus
);
302 osi_FreeSmallSpace(OutDirStatus
);
307 afs_MemHandleLink(struct vcache
*avc
, struct vrequest
*areq
)
311 afs_size_t offset
, len
;
312 afs_int32 tlen
, alen
;
315 AFS_STATCNT(afs_MemHandleLink
);
316 /* two different formats, one for links protected 644, have a "." at
317 * the end of the file name, which we turn into a null. Others,
318 * protected 755, we add a null to the end of */
319 if (!avc
->linkData
) {
321 tdc
= afs_GetDCache(avc
, (afs_size_t
) 0, areq
, &offset
, &len
, 0);
325 /* otherwise we have the data loaded, go for it */
330 if (avc
->f
.m
.Mode
& 0111)
331 alen
= len
+ 1; /* regular link */
333 alen
= len
; /* mt point */
334 rbuf
= osi_AllocLargeSpace(AFS_LRALLOCSIZ
);
335 ObtainReadLock(&tdc
->lock
);
336 addr
= afs_MemCacheOpen(&tdc
->f
.inode
);
338 code
= afs_MemReadBlk(addr
, 0, rbuf
, tlen
);
339 afs_MemCacheClose(addr
);
340 ReleaseReadLock(&tdc
->lock
);
343 alen
= strlen(rbuf
) + 1;
344 tp
= afs_osi_Alloc(alen
); /* make room for terminating null */
345 osi_Assert(tp
!= NULL
);
346 memcpy(tp
, rbuf
, alen
);
347 osi_FreeLargeSpace(rbuf
);
349 afs_osi_Free(tp
, alen
);
358 afs_UFSHandleLink(struct vcache
*avc
, struct vrequest
*areq
)
363 afs_size_t offset
, len
;
364 afs_int32 tlen
, alen
;
367 /* two different formats, one for links protected 644, have a "." at the
368 * end of the file name, which we turn into a null. Others, protected
369 * 755, we add a null to the end of */
370 AFS_STATCNT(afs_UFSHandleLink
);
371 if (!avc
->linkData
) {
372 tdc
= afs_GetDCache(avc
, (afs_size_t
) 0, areq
, &offset
, &len
, 0);
373 afs_Trace3(afs_iclSetp
, CM_TRACE_UFSLINK
, ICL_TYPE_POINTER
, avc
,
374 ICL_TYPE_POINTER
, tdc
, ICL_TYPE_OFFSET
,
375 ICL_HANDLE_OFFSET(avc
->f
.m
.Length
));
377 if (AFS_IS_DISCONNECTED
)
382 /* otherwise we have the data loaded, go for it */
387 if (avc
->f
.m
.Mode
& 0111)
388 alen
= len
+ 1; /* regular link */
390 alen
= len
; /* mt point */
391 rbuf
= osi_AllocLargeSpace(AFS_LRALLOCSIZ
);
393 ObtainReadLock(&tdc
->lock
);
394 tfile
= osi_UFSOpen(&tdc
->f
.inode
);
396 ReleaseReadLock(&tdc
->lock
);
398 osi_FreeLargeSpace(rbuf
);
401 code
= afs_osi_Read(tfile
, -1, rbuf
, tlen
);
403 ReleaseReadLock(&tdc
->lock
);
405 rbuf
[alen
- 1] = '\0';
406 alen
= strlen(rbuf
) + 1;
407 tp
= afs_osi_Alloc(alen
); /* make room for terminating null */
408 osi_Assert(tp
!= NULL
);
409 memcpy(tp
, rbuf
, alen
);
410 osi_FreeLargeSpace(rbuf
);
412 afs_osi_Free(tp
, alen
);
421 afs_readlink(OSI_VC_DECL(avc
), struct uio
*auio
, afs_ucred_t
*acred
)
424 struct vrequest
*treq
= NULL
;
426 struct afs_fakestat_state fakestat
;
429 AFS_STATCNT(afs_readlink
);
430 afs_Trace1(afs_iclSetp
, CM_TRACE_READLINK
, ICL_TYPE_POINTER
, avc
);
431 if ((code
= afs_CreateReq(&treq
, acred
)))
433 afs_InitFakeStat(&fakestat
);
437 code
= afs_EvalFakeStat(&avc
, &fakestat
, treq
);
440 code
= afs_VerifyVCache(avc
, treq
);
443 if (vType(avc
) != VLNK
) {
447 ObtainWriteLock(&avc
->lock
, 158);
448 code
= afs_HandleLink(avc
, treq
);
449 /* finally uiomove it to user-land */
453 AFS_UIOMOVE(tp
, strlen(tp
), UIO_READ
, auio
, code
);
458 ReleaseWriteLock(&avc
->lock
);
460 afs_PutFakeStat(&fakestat
);
462 code
= afs_CheckCode(code
, treq
, 32);
463 afs_DestroyReq(treq
);