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"
23 #include "afs/sysincludes.h" /* Standard vendor system headers */
24 #include "afsincludes.h" /* Afs-based standard headers */
25 #include "afs/afs_stats.h" /* statistics */
26 #include "afs/afs_cbqueue.h"
27 #include "afs/nfsclient.h"
28 #include "afs/afs_osidnlc.h"
32 /* given a vnode ptr, open flags and credentials, open the file. No access
33 * checks are done here, instead they're done by afs_create or afs_access,
34 * both called by the vn_open call.
38 afs_open(bhv_desc_t * bhv, struct vcache **avcp, afs_int32 aflags,
39 struct AFS_UCRED *acred)
41 afs_open(struct vcache **avcp, afs_int32 aflags, struct AFS_UCRED *acred)
44 register afs_int32 code;
48 struct afs_fakestat_state fakestate;
50 AFS_STATCNT(afs_open);
51 if ((code = afs_InitReq(&treq, acred)))
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);
65 code = afs_VerifyVCache(tvc, &treq);
68 if (aflags & (FWRITE | FTRUNC))
72 if (vType(tvc) == VDIR) {
79 (tvc, ((tvc->states & CForeign) ? PRSFS_READ : PRSFS_LOOKUP),
80 &treq, CHECK_MODE_BITS)) {
87 if (AFS_NFSXLATORREQ(acred) && (aflags & FREAD)) {
89 (tvc, PRSFS_READ, &treq,
90 CHECK_MODE_BITS | CMB_ALLOW_EXEC_AS_READ)) {
97 if (aflags & FRSHARE) {
100 * Apparently it is possible for a file to get mapped without
101 * either VNOP_MAP or VNOP_RDWR being called, if (1) it is a
102 * sharable library, and (2) it has already been loaded. We must
103 * ensure that the credp is up to date. We detect the situation
104 * by checking for O_RSHARE at open time.
107 * We keep the caller's credentials since an async daemon will
108 * handle the request at some point. We assume that the same
109 * credentials will be used.
111 ObtainWriteLock(&tvc->lock, 140);
112 if (!tvc->credp || (tvc->credp != acred)) {
115 struct ucred *crp = tvc->credp;
121 ReleaseWriteLock(&tvc->lock);
124 /* normal file or symlink */
125 osi_FlushText(tvc); /* only needed to flush text if text locked last time */
126 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV)
127 afs_BozonLock(&tvc->pvnLock, tvc);
129 osi_FlushPages(tvc, acred);
130 #if defined(AFS_SUN_ENV) || defined(AFS_ALPHA_ENV) || defined(AFS_SUN5_ENV)
131 afs_BozonUnlock(&tvc->pvnLock, tvc);
134 /* set date on file if open in O_TRUNC mode */
135 if (aflags & FTRUNC) {
136 /* this fixes touch */
137 ObtainWriteLock(&tvc->lock, 123);
138 tvc->m.Date = osi_Time();
139 tvc->states |= CDirty;
140 ReleaseWriteLock(&tvc->lock);
142 ObtainReadLock(&tvc->lock);
144 tvc->execsOrWriters++;
146 #if defined(AFS_SGI_ENV)
147 if (writing && tvc->cred == NULL) {
152 ReleaseReadLock(&tvc->lock);
154 afs_PutFakeStat(&fakestate);
155 code = afs_CheckCode(code, &treq, 4); /* avoid AIX -O bug */
157 afs_Trace2(afs_iclSetp, CM_TRACE_OPEN, ICL_TYPE_POINTER, tvc,
158 ICL_TYPE_INT32, 999999);