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
22 #include <afsconfig.h>
23 #include "../afs/param.h"
27 #include "../afs/sysincludes.h" /* Standard vendor system headers */
28 #include "../afs/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"
35 extern afs_rwlock_t afs_xvcache;
36 extern afs_rwlock_t afs_xcbhash;
41 * Wire down file in cache: prefetch all data, and turn on CWired flag
42 * so that callbacks/callback expirations are (temporarily) ignored
43 * and cache file(s) are kept in cache. File will be unwired when
44 * afs_inactive is called (ie no one has VN_HOLD on vnode), or when
45 * afs_IsWired notices that the file is no longer Active.
48 #else /* AFS_OSF_ENV */
49 static void FetchWholeEnchilada(avc, areq)
51 struct vrequest *areq;
52 register struct vcache *avc; {
53 register afs_int32 nextChunk;
54 register struct dcache *tdc;
55 afs_size_t pos, offset, len;
57 AFS_STATCNT(FetchWholeEnchilada);
58 if ((avc->states & CStatd) == 0) return; /* don't know size */
59 for(nextChunk=0;nextChunk<1024;nextChunk++) { /* sanity check on N chunks */
60 pos = AFS_CHUNKTOBASE(nextChunk);
61 #if defined(AFS_OSF_ENV)
62 if (pos >= avc->m.Length) break; /* all done */
63 #else /* AFS_OSF_ENV */
64 if (pos >= avc->m.Length) return; /* all done */
66 tdc = afs_GetDCache(avc, pos, areq, &offset, &len, 0);
68 #if defined(AFS_OSF_ENV)
70 #else /* AFS_OSF_ENV */
75 #if defined(AFS_OSF_ENV)
76 avc->states |= CWired;
77 #endif /* AFS_OSF_ENV */
80 #if defined(AFS_OSF_ENV)
82 * Tests whether file is wired down, after unwiring the file if it
83 * is found to be inactive (ie not open and not being paged from).
86 register struct vcache *avc; {
87 if (avc->states & CWired) {
88 if (osi_Active(avc)) {
91 avc->states &= ~CWired;
95 #endif /* AFS_OSF_ENV */
97 afsremove(adp, tdc, tvc, aname, acred, treqp)
98 register struct vcache *adp;
99 register struct dcache *tdc;
100 register struct vcache *tvc;
102 struct vrequest *treqp;
103 struct AFS_UCRED *acred; {
104 register afs_int32 code;
105 register struct conn *tc;
106 struct AFSFetchStatus OutDirStatus;
107 struct AFSVolSync tsync;
111 tc = afs_Conn(&adp->fid, treqp, SHARED_LOCK);
113 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_REMOVEFILE);
114 #ifdef RX_ENABLE_LOCKS
116 #endif /* RX_ENABLE_LOCKS */
117 code = RXAFS_RemoveFile(tc->id, (struct AFSFid *) &adp->fid.Fid,
118 aname, &OutDirStatus, &tsync);
119 #ifdef RX_ENABLE_LOCKS
121 #endif /* RX_ENABLE_LOCKS */
126 (afs_Analyze(tc, code, &adp->fid, treqp,
127 AFS_STATS_FS_RPCIDX_REMOVEFILE, SHARED_LOCK, (struct cell *)0));
129 osi_dnlc_remove (adp, aname, tvc);
130 if (tvc) afs_symhint_inval(tvc); /* XXX: don't really need to be so extreme */
133 if (tdc) afs_PutDCache(tdc);
134 if (tvc) afs_PutVCache(tvc, WRITE_LOCK);
137 ObtainWriteLock(&afs_xcbhash, 497);
138 afs_DequeueCallback(adp);
139 adp->states &= ~CStatd;
140 ReleaseWriteLock(&afs_xcbhash);
141 osi_dnlc_purgedp(adp);
143 ReleaseWriteLock(&adp->lock);
144 code = afs_CheckCode(code, treqp, 21);
147 if (afs_LocalHero(adp, tdc, &OutDirStatus, 1)) {
148 /* we can do it locally */
149 code = afs_dir_Delete(&tdc->f.inode, aname);
151 ZapDCE(tdc); /* surprise error -- invalid value */
156 afs_PutDCache(tdc); /* drop ref count */
158 ReleaseWriteLock(&adp->lock);
160 /* now, get vnode for unlinked dude, and see if we should force it
161 * from cache. adp is now the deleted files vnode. Note that we
162 * call FindVCache instead of GetVCache since if the file's really
163 * gone, we won't be able to fetch the status info anyway. */
165 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV)
166 afs_BozonLock(&tvc->pvnLock, tvc);
167 /* Since afs_TryToSmush will do a pvn_vptrunc */
169 ObtainWriteLock(&tvc->lock,141);
170 /* note that callback will be broken on the deleted file if there are
171 * still >0 links left to it, so we'll get the stat right */
173 tvc->states &= ~CUnique; /* For the dfs xlator */
174 if (tvc->m.LinkCount == 0 && !osi_Active(tvc)) {
175 if (!AFS_NFSXLATORREQ(acred)) afs_TryToSmush(tvc, acred, 0);
177 ReleaseWriteLock(&tvc->lock);
178 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV)
179 afs_BozonUnlock(&tvc->pvnLock, tvc);
181 afs_PutVCache(tvc, WRITE_LOCK);
186 static char *newname() {
187 char *name, *sp, *p = ".__afs";
188 afs_int32 rd = afs_random() & 0xffff;
190 sp = name = osi_AllocSmallSpace(AFS_SMALLOCSIZ);
191 while (*p != '\0') *sp++ = *p++;
193 *sp++= "0123456789ABCDEF"[rd & 0x0f];
200 /* these variables appear to exist for debugging purposes */
201 struct vcache * Tadp1, * Ttvc;
206 /* Note that we don't set CDirty here, this is OK because the unlink
207 * RPC is called synchronously */
210 struct nameidata *ndp; {
211 register struct vcache *adp = (struct vcache *)ndp->ni_dvp;
212 char *aname = ndp->ni_dent.d_name;
213 struct ucred *acred = ndp->ni_cred;
214 #else /* AFS_OSF_ENV */
215 afs_remove(OSI_VC_ARG(adp), aname, acred)
218 struct AFS_UCRED *acred; {
220 struct vrequest treq;
221 register struct dcache *tdc;
222 struct VenusFid unlinkFid;
223 register afs_int32 code;
224 register struct vcache *tvc;
225 afs_size_t offset, len;
226 struct AFSFetchStatus OutDirStatus;
227 struct AFSVolSync tsync;
231 AFS_STATCNT(afs_remove);
232 afs_Trace2(afs_iclSetp, CM_TRACE_REMOVE, ICL_TYPE_POINTER, adp,
233 ICL_TYPE_STRING, aname);
235 if (code = afs_InitReq(&treq, acred))
238 code = afs_VerifyVCache(adp, &treq);
240 tvc = (struct vcache *)ndp->ni_vp; /* should never be null */
242 afs_PutVCache(adp, 0);
243 afs_PutVCache(tvc, 0);
244 return afs_CheckCode(code, &treq, 22);
246 #else /* AFS_OSF_ENV */
247 tvc = (struct vcache *) 0;
249 code = afs_CheckCode(code, &treq, 23);
254 /** If the volume is read-only, return error without making an RPC to the
257 if ( adp->states & CRO ) {
262 tdc = afs_GetDCache(adp, (afs_size_t) 0, &treq, &offset, &len, 1); /* test for error below */
263 ObtainWriteLock(&adp->lock,142);
266 * Make sure that the data in the cache is current. We may have
267 * received a callback while we were waiting for the write lock.
269 if (!(adp->states & CStatd)
270 || (tdc && !hsame(adp->m.DataVersion, tdc->f.versionNo))) {
271 ReleaseWriteLock(&adp->lock);
277 unlinkFid.Fid.Vnode = 0;
279 tvc = osi_dnlc_lookup (adp, aname, WRITE_LOCK);
281 /* This should not be necessary since afs_lookup() has already
285 code = afs_dir_Lookup(&tdc->f.inode, aname, &unlinkFid.Fid);
289 unlinkFid.Cell = adp->fid.Cell;
290 unlinkFid.Fid.Volume = adp->fid.Fid.Volume;
291 if (unlinkFid.Fid.Unique == 0) {
292 tvc = afs_LookupVCache(&unlinkFid, &treq, &cached,
293 WRITE_LOCK, adp, aname);
295 ObtainReadLock(&afs_xvcache);
296 tvc = afs_FindVCache(&unlinkFid, 1, WRITE_LOCK,
298 ReleaseReadLock(&afs_xvcache);
303 if (tvc && osi_Active(tvc)) {
304 /* about to delete whole file, prefetch it first */
305 ReleaseWriteLock(&adp->lock);
306 ObtainWriteLock(&tvc->lock,143);
307 #if defined(AFS_OSF_ENV)
308 afs_Wire(tvc, &treq);
309 #else /* AFS_OSF_ENV */
310 FetchWholeEnchilada(tvc, &treq);
312 ReleaseWriteLock(&tvc->lock);
313 ObtainWriteLock(&adp->lock,144);
316 osi_dnlc_remove ( adp, aname, tvc);
317 if (tvc) afs_symhint_inval(tvc);
319 Tadp1 = adp; Tadpr = VREFCOUNT(adp); Ttvc = tvc; Tnam = aname; Tnam1 = 0;
320 if (tvc) Ttvcr = VREFCOUNT(tvc);
322 if (tvc && (VREFCOUNT(tvc) > 2) && tvc->opens > 0 && !(tvc->states & CUnlinked)) {
324 if (tvc && (VREFCOUNT(tvc) > 1) && tvc->opens > 0 && !(tvc->states & CUnlinked)) {
326 char *unlname = newname();
328 ReleaseWriteLock(&adp->lock);
329 code = afsrename(adp, aname, adp, unlname, acred);
332 tvc->mvid = (struct VenusFid *)unlname;
338 tvc->states |= CUnlinked;
340 osi_FreeSmallSpace(unlname);
344 afs_PutVCache(tvc, WRITE_LOCK);
346 code = afsremove(adp, tdc, tvc, aname, acred, &treq);
349 afs_PutVCache(adp, WRITE_LOCK);
350 #endif /* AFS_OSF_ENV */
355 /* afs_remunlink -- This tries to delete the file at the server after it has
356 * been renamed when unlinked locally but now has been finally released.
358 * CAUTION -- may be called with avc unheld. */
360 afs_remunlink(avc, doit)
361 register struct vcache *avc;
364 struct AFS_UCRED *cred;
367 struct vrequest treq;
368 struct VenusFid dirFid;
369 register struct dcache *tdc;
372 if (NBObtainWriteLock(&avc->lock, 423))
375 if (avc->mvid && (doit || (avc->states & CUnlinkedDel))) {
376 if (code = afs_InitReq(&treq, avc->uncred)) {
377 ReleaseWriteLock(&avc->lock);
380 /* Must bump the refCount because GetVCache may block.
381 * Also clear mvid so no other thread comes here if we block.
383 unlname = (char *)avc->mvid;
390 /* We'll only try this once. If it fails, just release the vnode.
391 * Clear after doing hold so that NewVCache doesn't find us yet.
393 avc->states &= ~(CUnlinked | CUnlinkedDel);
395 ReleaseWriteLock(&avc->lock);
397 dirFid.Cell = avc->fid.Cell;
398 dirFid.Fid.Volume = avc->fid.Fid.Volume;
399 dirFid.Fid.Vnode = avc->parentVnode;
400 dirFid.Fid.Unique = avc->parentUnique;
401 adp = afs_GetVCache(&dirFid, &treq, (afs_int32 *)0,
402 (struct vcache *)0, WRITE_LOCK);
405 tdc = afs_FindDCache(adp, 0);
406 ObtainWriteLock(&adp->lock, 159);
408 /* afsremove releases the adp lock, and does vn_rele(avc) */
409 code = afsremove(adp, tdc, avc, unlname, cred, &treq);
410 afs_PutVCache(adp, WRITE_LOCK);
412 /* we failed - and won't be back to try again. */
413 afs_PutVCache(avc, WRITE_LOCK);
415 osi_FreeSmallSpace(unlname);
420 ReleaseWriteLock(&avc->lock);