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"
22 #include "afs/sysincludes.h" /* Standard vendor system headers */
23 #include "afsincludes.h" /* Afs-based standard headers */
24 #include "afs/afs_stats.h" /* statistics */
25 #include "afs/afs_cbqueue.h"
26 #include "afs/nfsclient.h"
27 #include "afs/afs_osidnlc.h"
31 /* given a vnode ptr, open flags and credentials, open the file. No access
32 * checks are done here, instead they're done by afs_create or afs_access,
33 * both called by the vn_open call.
36 afs_open(bhv, avcp, aflags, acred)
39 afs_open(avcp, aflags, acred)
41 register struct vcache **avcp;
43 struct AFS_UCRED *acred;
45 register afs_int32 code;
49 struct afs_fakestat_state fakestate;
51 AFS_STATCNT(afs_open);
52 if ((code = afs_InitReq(&treq, acred))) return code;
54 /* avcpp can be, but is not necesarily, bhp's vnode. */
55 tvc = VTOAFS(BHV_TO_VNODE(bhv));
59 afs_Trace2(afs_iclSetp, CM_TRACE_OPEN, ICL_TYPE_POINTER, tvc,
60 ICL_TYPE_INT32, aflags);
61 afs_InitFakeStat(&fakestate);
62 code = afs_EvalFakeStat(&tvc, &fakestate, &treq);
64 code = afs_VerifyVCache(tvc, &treq);
66 if (aflags & (FWRITE | FTRUNC)) writing = 1;
68 if (vType(tvc) == VDIR) {
75 if (!afs_AccessOK(tvc,
76 ((tvc->states & CForeign) ? PRSFS_READ: PRSFS_LOOKUP),
77 &treq, CHECK_MODE_BITS)) {
85 if (AFS_NFSXLATORREQ(acred) && (aflags & FREAD)) {
86 if (!afs_AccessOK(tvc, PRSFS_READ, &treq,
87 CHECK_MODE_BITS|CMB_ALLOW_EXEC_AS_READ)) {
94 if (aflags & FRSHARE) {
97 * Apparently it is possible for a file to get mapped without
98 * either VNOP_MAP or VNOP_RDWR being called, if (1) it is a
99 * sharable library, and (2) it has already been loaded. We must
100 * ensure that the credp is up to date. We detect the situation
101 * by checking for O_RSHARE at open time.
104 * We keep the caller's credentials since an async daemon will
105 * handle the request at some point. We assume that the same
106 * credentials will be used.
108 ObtainWriteLock(&tvc->lock,140);
109 if (!tvc->credp || (tvc->credp != acred)) {
112 struct ucred *crp = tvc->credp;
118 ReleaseWriteLock(&tvc->lock);
121 /* normal file or symlink */
122 osi_FlushText(tvc); /* only needed to flush text if text locked last time */
123 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV)
124 afs_BozonLock(&tvc->pvnLock, tvc);
126 osi_FlushPages(tvc, acred);
127 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV)
128 afs_BozonUnlock(&tvc->pvnLock, tvc);
131 /* set date on file if open in O_TRUNC mode */
132 if (aflags & FTRUNC) {
133 /* this fixes touch */
134 ObtainWriteLock(&tvc->lock,123);
135 tvc->m.Date = osi_Time();
136 tvc->states |= CDirty;
137 ReleaseWriteLock(&tvc->lock);
139 ObtainReadLock(&tvc->lock);
140 if (writing) tvc->execsOrWriters++;
142 #if defined(AFS_SGI_ENV)
143 if (writing && tvc->cred == NULL) {
148 ReleaseReadLock(&tvc->lock);
150 afs_PutFakeStat(&fakestate);
151 code = afs_CheckCode(code, &treq, 4); /* avoid AIX -O bug */
153 afs_Trace2(afs_iclSetp, CM_TRACE_OPEN, ICL_TYPE_POINTER, tvc,
154 ICL_TYPE_INT32, 999999);