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
17 #include <afsconfig.h>
18 #include "afs/param.h"
21 #include "afs/sysincludes.h" /* Standard vendor system headers */
22 #include "afsincludes.h" /* Afs-based standard headers */
23 #include "afs/afs_stats.h" /* statistics */
24 #include "afs/afs_cbqueue.h"
25 #include "afs/nfsclient.h"
26 #include "afs/afs_osidnlc.h"
30 /* given a vnode ptr, open flags and credentials, open the file. No access
31 * checks are done here, instead they're done by afs_create or afs_access,
32 * both called by the vn_open call.
36 afs_open(bhv_desc_t * bhv, struct vcache **avcp, afs_int32 aflags,
39 afs_open(struct vcache **avcp, afs_int32 aflags, afs_ucred_t *acred)
43 struct vrequest *treq = NULL;
46 struct afs_fakestat_state fakestate;
48 AFS_STATCNT(afs_open);
49 if ((code = afs_CreateReq(&treq, acred)))
52 /* avcpp can be, but is not necesarily, bhp's vnode. */
53 tvc = VTOAFS(BHV_TO_VNODE(bhv));
57 afs_Trace2(afs_iclSetp, CM_TRACE_OPEN, ICL_TYPE_POINTER, tvc,
58 ICL_TYPE_INT32, aflags);
59 afs_InitFakeStat(&fakestate);
63 code = afs_EvalFakeStat(&tvc, &fakestate, treq);
66 code = afs_VerifyVCache(tvc, treq);
70 ObtainReadLock(&tvc->lock);
72 if (AFS_IS_DISCONNECTED && (afs_DCacheMissingChunks(tvc) != 0)) {
73 ReleaseReadLock(&tvc->lock);
74 /* printf("Network is down in afs_open: missing chunks\n"); */
79 ReleaseReadLock(&tvc->lock);
81 if (aflags & (FWRITE | FTRUNC))
85 if (vType(tvc) == VDIR) {
92 (tvc, ((tvc->f.states & CForeign) ? PRSFS_READ : PRSFS_LOOKUP),
93 treq, CHECK_MODE_BITS)) {
95 /* printf("afs_Open: no access for dir\n"); */
101 if (AFS_NFSXLATORREQ(acred) && (aflags & FREAD)) {
103 (tvc, PRSFS_READ, treq,
104 CHECK_MODE_BITS | CMB_ALLOW_EXEC_AS_READ)) {
111 if (aflags & FRSHARE) {
114 * Apparently it is possible for a file to get mapped without
115 * either VNOP_MAP or VNOP_RDWR being called, if (1) it is a
116 * sharable library, and (2) it has already been loaded. We must
117 * ensure that the credp is up to date. We detect the situation
118 * by checking for O_RSHARE at open time.
121 * We keep the caller's credentials since an async daemon will
122 * handle the request at some point. We assume that the same
123 * credentials will be used.
125 ObtainWriteLock(&tvc->lock, 140);
126 if (!tvc->credp || (tvc->credp != acred)) {
129 struct ucred *crp = tvc->credp;
135 ReleaseWriteLock(&tvc->lock);
138 /* normal file or symlink */
139 osi_FlushText(tvc); /* only needed to flush text if text locked last time */
140 osi_FlushPages(tvc, acred);
142 /* set date on file if open in O_TRUNC mode */
143 if (aflags & FTRUNC) {
144 /* this fixes touch */
145 ObtainWriteLock(&tvc->lock, 123);
146 tvc->f.m.Date = osi_Time();
147 tvc->f.states |= CDirty;
148 ReleaseWriteLock(&tvc->lock);
150 ObtainReadLock(&tvc->lock);
152 tvc->execsOrWriters++;
154 #if defined(AFS_SGI_ENV) || defined (AFS_LINUX26_ENV)
155 if (writing && tvc->cred == NULL) {
160 ReleaseReadLock(&tvc->lock);
161 if ((afs_preCache != 0) && (writing == 0) && (vType(tvc) != VDIR) &&
164 afs_size_t offset, len;
166 tdc = afs_GetDCache(tvc, 0, treq, &offset, &len, 1);
168 ObtainSharedLock(&tdc->mflock, 865);
169 if (!(tdc->mflags & DFFetchReq)) {
172 /* start the daemon (may already be running, however) */
173 UpgradeSToWLock(&tdc->mflock, 666);
174 tdc->mflags |= DFFetchReq; /* guaranteed to be cleared by BKG or
176 /* last parm (1) tells bkg daemon to do an afs_PutDCache when it
177 is done, since we don't want to wait for it to finish before
180 bp = afs_BQueue(BOP_FETCH, tvc, B_DONTWAIT, 0, acred,
181 (afs_size_t) 0, (afs_size_t) 1, tdc,
182 (void *)0, (void *)0);
184 tdc->mflags &= ~DFFetchReq;
186 ReleaseWriteLock(&tdc->mflock);
188 ReleaseSharedLock(&tdc->mflock);
193 afs_PutFakeStat(&fakestate);
196 code = afs_CheckCode(code, treq, 4); /* avoid AIX -O bug */
197 afs_DestroyReq(treq);
199 afs_Trace2(afs_iclSetp, CM_TRACE_OPEN, ICL_TYPE_POINTER, tvc,
200 ICL_TYPE_INT32, 999999);