afs_open(struct vcache **avcp, afs_int32 aflags, afs_ucred_t *acred)
#endif
{
afs_int32 code;
struct vrequest treq;
struct vcache *tvc;
int writing;
struct afs_fakestat_state fakestate;
AFS_STATCNT(afs_open);
if ((code = afs_InitReq(&treq, acred)))
return code;
#ifdef AFS_SGI64_ENV
/* avcpp can be, but is not necesarily, bhp's vnode. */
tvc = VTOAFS(BHV_TO_VNODE(bhv));
#else
tvc = *avcp;
#endif
afs_Trace2(afs_iclSetp, CM_TRACE_OPEN, ICL_TYPE_POINTER, tvc,
ICL_TYPE_INT32, aflags);
afs_InitFakeStat(&fakestate);
AFS_DISCON_LOCK();
code = afs_EvalFakeStat(&tvc, &fakestate, &treq);
if (code)
goto done;
code = afs_VerifyVCache(tvc, &treq);
if (code)
goto done;
ObtainReadLock(&tvc->lock);
if (AFS_IS_DISCONNECTED && (afs_DCacheMissingChunks(tvc) != 0)) {
ReleaseReadLock(&tvc->lock);
/* printf("Network is down in afs_open: missing chunks\n"); */
code = ENETDOWN;
goto done;
}
ReleaseReadLock(&tvc->lock);
if (aflags & (FWRITE | FTRUNC))
writing = 1;
else
writing = 0;
if (vType(tvc) == VDIR) {
/* directory */
if (writing) {
code = EISDIR;
goto done;
} else {
if (!afs_AccessOK
(tvc, ((tvc->f.states & CForeign) ? PRSFS_READ : PRSFS_LOOKUP),
&treq, CHECK_MODE_BITS)) {
code = EACCES;
/* printf("afs_Open: no access for dir\n"); */
goto done;
}
}
} else {
#ifdef AFS_SUN5_ENV
if (AFS_NFSXLATORREQ(acred) && (aflags & FREAD)) {
if (!afs_AccessOK
(tvc, PRSFS_READ, &treq,
CHECK_MODE_BITS | CMB_ALLOW_EXEC_AS_READ)) {
code = EACCES;
goto done;
}
}
#endif
#ifdef AFS_AIX41_ENV
if (aflags & FRSHARE) {
/*
* Hack for AIX 4.1:
* Apparently it is possible for a file to get mapped without
* either VNOP_MAP or VNOP_RDWR being called, if (1) it is a
* sharable library, and (2) it has already been loaded. We must
* ensure that the credp is up to date. We detect the situation
* by checking for O_RSHARE at open time.
*/
/*
* We keep the caller's credentials since an async daemon will
* handle the request at some point. We assume that the same
* credentials will be used.
*/
ObtainWriteLock(&tvc->lock, 140);
if (!tvc->credp || (tvc->credp != acred)) {
crhold(acred);
if (tvc->credp) {
struct ucred *crp = tvc->credp;
tvc->credp = NULL;
crfree(crp);
}
tvc->credp = acred;
}
ReleaseWriteLock(&tvc->lock);
}
#endif
/* normal file or symlink */
osi_FlushText(tvc); /* only needed to flush text if text locked last time */
#ifdef AFS_BOZONLOCK_ENV
afs_BozonLock(&tvc->pvnLock, tvc);
#endif
osi_FlushPages(tvc, acred);
#ifdef AFS_BOZONLOCK_ENV
afs_BozonUnlock(&tvc->pvnLock, tvc);
#endif
}
/* set date on file if open in O_TRUNC mode */
if (aflags & FTRUNC) {
/* this fixes touch */
ObtainWriteLock(&tvc->lock, 123);
tvc->f.m.Date = osi_Time();
tvc->f.states |= CDirty;
ReleaseWriteLock(&tvc->lock);
}
ObtainReadLock(&tvc->lock);
if (writing)
tvc->execsOrWriters++;
tvc->opens++;
#if defined(AFS_SGI_ENV) || defined (AFS_LINUX26_ENV)
if (writing && tvc->cred == NULL) {
crhold(acred);
tvc->cred = acred;
}
#endif
ReleaseReadLock(&tvc->lock);
if ((afs_preCache != 0) && (writing == 0) && (vType(tvc) != VDIR) &&
(!afs_BBusy())) {
struct dcache *tdc;
afs_size_t offset, len;
tdc = afs_GetDCache(tvc, 0, &treq, &offset, &len, 1);
ObtainSharedLock(&tdc->mflock, 865);
if (!(tdc->mflags & DFFetchReq)) {
struct brequest *bp;
/* start the daemon (may already be running, however) */
UpgradeSToWLock(&tdc->mflock, 666);
tdc->mflags |= DFFetchReq; /* guaranteed to be cleared by BKG or
GetDCache */
/* last parm (1) tells bkg daemon to do an afs_PutDCache when it
is done, since we don't want to wait for it to finish before
doing so ourselves.
*/
bp = afs_BQueue(BOP_FETCH, tvc, B_DONTWAIT, 0, acred,
(afs_size_t) 0, (afs_size_t) 1, tdc,
(void *)0, (void *)0);
if (!bp) {
tdc->mflags &= ~DFFetchReq;
}
ReleaseWriteLock(&tdc->mflock);
} else {
ReleaseSharedLock(&tdc->mflock);
}
}
done:
afs_PutFakeStat(&fakestate);
AFS_DISCON_UNLOCK();
code = afs_CheckCode(code, &treq, 4); /* avoid AIX -O bug */
afs_Trace2(afs_iclSetp, CM_TRACE_OPEN, ICL_TYPE_POINTER, tvc,
ICL_TYPE_INT32, 999999);
return code;
}
int
afs_getattr(OSI_VC_DECL(avc), struct vattr *attrs, afs_ucred_t *acred)
#endif
{
afs_int32 code;
struct vrequest *treq = NULL;
struct unixuser *au;
int inited = 0;
OSI_VC_CONVERT(avc);
AFS_STATCNT(afs_getattr);
afs_Trace2(afs_iclSetp, CM_TRACE_GETATTR, ICL_TYPE_POINTER, avc,
ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length));
if (afs_fakestat_enable && avc->mvstat == AFS_MVSTAT_MTPT) {
struct afs_fakestat_state fakestat;
struct vrequest *ureq = NULL;
code = afs_CreateReq(&ureq, acred);
if (code) {
return code;
}
afs_InitFakeStat(&fakestat);
code = afs_TryEvalFakeStat(&avc, &fakestat, ureq);
if (code) {
afs_PutFakeStat(&fakestat);
afs_DestroyReq(ureq);
return code;
}
code = afs_CopyOutAttrs(avc, attrs);
afs_PutFakeStat(&fakestat);
afs_DestroyReq(ureq);
return code;
}
#if defined(AFS_SUN5_ENV)
if (flags & ATTR_HINT) {
code = afs_CopyOutAttrs(avc, attrs);
return code;
}
#endif
#if defined(AFS_DARWIN_ENV) && !defined(AFS_DARWIN80_ENV)
if (avc->f.states & CUBCinit) {
code = afs_CopyOutAttrs(avc, attrs);
return code;
}
#endif
AFS_DISCON_LOCK();
if (afs_shuttingdown != AFS_RUNNING) {
AFS_DISCON_UNLOCK();
return EIO;
}
if (!(avc->f.states & CStatd)) {
if (!(code = afs_CreateReq(&treq, acred))) {
code = afs_VerifyVCache2(avc, treq);
inited = 1;
}
} else
code = 0;
#if defined(AFS_SUN5_ENV)
if (code == 0)
osi_FlushPages(avc, acred);
#endif
if (code == 0) {
osi_FlushText(avc); /* only needed to flush text if text locked last time */
code = afs_CopyOutAttrs(avc, attrs);
if (afs_nfsexporter) {
if (!inited) {
if ((code = afs_CreateReq(&treq, acred))) {
return code;
}
inited = 1;
}
if (AFS_NFSXLATORREQ(acred)) {
if ((vType(avc) != VDIR)
&& !afs_AccessOK(avc, PRSFS_READ, treq,
CHECK_MODE_BITS |
CMB_ALLOW_EXEC_AS_READ)) {
afs_DestroyReq(treq);
return EACCES;
}
}
if ((au = afs_FindUser(treq->uid, -1, READ_LOCK))) {
struct afs_exporter *exporter = au->exporter;
if (exporter && !(afs_nfsexporter->exp_states & EXP_UNIXMODE)) {
unsigned int ubits;
/*
* If the remote user wishes to enforce default Unix mode semantics,
* like in the nfs exporter case, we OR in the user bits
* into the group and other bits. We need to do this
* because there is no RFS_ACCESS call and thus nfs
* clients implement nfs_access by interpreting the
* mode bits in the traditional way, which of course
* loses with afs.
*/
ubits = (attrs->va_mode & 0700) >> 6;
attrs->va_mode = attrs->va_mode | ubits | (ubits << 3);
/* If it's the root of AFS, replace the inode number with the
* inode number of the mounted on directory; otherwise this
* confuses getwd()... */
#ifdef AFS_LINUX22_ENV
if (avc == afs_globalVp) {
struct inode *ip = AFSTOV(avc)->i_sb->s_root->d_inode;
attrs->va_nodeid = ip->i_ino; /* VTOI()? */
}
#else
if (
#if defined(AFS_DARWIN_ENV)
vnode_isvroot(AFSTOV(avc))
#elif defined(AFS_NBSD50_ENV)
AFSTOV(avc)->v_vflag & VV_ROOT
#else
AFSTOV(avc)->v_flag & VROOT
#endif
) {
struct vnode *vp = AFSTOV(avc);
#ifdef AFS_DARWIN80_ENV
/* XXX vp = vnode_mount(vp)->mnt_vnodecovered; */
vp = 0;
#else
vp = vp->v_vfsp->vfs_vnodecovered;
if (vp) { /* Ignore weird failures */
#ifdef AFS_SGI62_ENV
attrs->va_nodeid = VnodeToIno(vp);
#else
struct inode *ip;
ip = (struct inode *)VTOI(vp);
if (ip) /* Ignore weird failures */
attrs->va_nodeid = ip->i_number;
#endif
}
#endif
}
#endif /* AFS_LINUX22_ENV */
}
afs_PutUser(au, READ_LOCK);
}
}
