예제 #1
0
/* don't set CDirty in here because RPC is called synchronously */
int 
afs_symlink(OSI_VC_DECL(adp), char *aname, struct vattr *attrs, 
	    char *atargetName, struct vcache **tvcp, afs_ucred_t *acred)
{
    afs_uint32 now = 0;
    struct vrequest *treq = NULL;
    afs_int32 code = 0;
    struct afs_conn *tc;
    struct VenusFid newFid;
    struct dcache *tdc;
    afs_size_t offset, len;
    afs_int32 alen;
    struct server *hostp = 0;
    struct vcache *tvc;
    struct AFSStoreStatus InStatus;
    struct AFSFetchStatus *OutFidStatus, *OutDirStatus;
    struct AFSCallBack CallBack;
    struct AFSVolSync tsync;
    struct volume *volp = 0;
    struct afs_fakestat_state fakestate;
    struct rx_connection *rxconn;
    XSTATS_DECLS;
    OSI_VC_CONVERT(adp);

    AFS_STATCNT(afs_symlink);
    afs_Trace2(afs_iclSetp, CM_TRACE_SYMLINK, ICL_TYPE_POINTER, adp,
	       ICL_TYPE_STRING, aname);

    OutFidStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
    OutDirStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
    memset(&InStatus, 0, sizeof(InStatus));

    if ((code = afs_CreateReq(&treq, acred)))
	goto done2;

    afs_InitFakeStat(&fakestate);

    AFS_DISCON_LOCK();
    
    code = afs_EvalFakeStat(&adp, &fakestate, treq);
    if (code)
	goto done;

    if (strlen(aname) > AFSNAMEMAX || strlen(atargetName) > AFSPATHMAX) {
	code = ENAMETOOLONG;
	goto done;
    }

    if (afs_IsDynroot(adp)) {
	code = afs_DynrootVOPSymlink(adp, acred, aname, atargetName);
	goto done;
    }
    if (afs_IsDynrootMount(adp)) {
	code = EROFS;
	goto done;
    }

    code = afs_VerifyVCache(adp, treq);
    if (code) {
	code = afs_CheckCode(code, treq, 30);
	goto done;
    }

    /** If the volume is read-only, return error without making an RPC to the
      * fileserver
      */
    if (adp->f.states & CRO) {
	code = EROFS;
	goto done;
    }

    if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) {
        code = ENETDOWN;
        goto done;
    }
    
    InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE;
    InStatus.ClientModTime = osi_Time();
    alen = strlen(atargetName);	/* we want it to include the null */
    if ( (*atargetName == '#' || *atargetName == '%') && alen > 1 && atargetName[alen-1] == '.') {
	InStatus.UnixModeBits = 0644;	/* mt pt: null from "." at end */
	if (alen == 1)
	    alen++;		/* Empty string */
    } else {
	InStatus.UnixModeBits = 0755;
	alen++;			/* add in the null */
    }
    tdc = afs_GetDCache(adp, (afs_size_t) 0, treq, &offset, &len, 1);
    volp = afs_FindVolume(&adp->f.fid, READ_LOCK);	/*parent is also in same vol */
    ObtainWriteLock(&adp->lock, 156);
    if (tdc)
	ObtainWriteLock(&tdc->lock, 636);
    /* No further locks: if the SymLink succeeds, it does not matter what happens
     * to our local copy of the directory. If somebody tampers with it in the meantime,
     * the copy will be invalidated */
    if (!AFS_IS_DISCON_RW) {
	do {
	    tc = afs_Conn(&adp->f.fid, treq, SHARED_LOCK, &rxconn);
	    if (tc) {
		hostp = tc->parent->srvr->server;
		XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK);
		if (adp->f.states & CForeign) {
		    now = osi_Time();
		    RX_AFS_GUNLOCK();
		    code = 
			RXAFS_DFSSymlink(rxconn,
					 (struct AFSFid *)&adp->f.fid.Fid,
					 aname, atargetName, &InStatus,
					 (struct AFSFid *)&newFid.Fid,
					 OutFidStatus, OutDirStatus,
					 &CallBack, &tsync);
		    RX_AFS_GLOCK();
		} else {
		    RX_AFS_GUNLOCK();
		    code =
			RXAFS_Symlink(rxconn, (struct AFSFid *)&adp->f.fid.Fid,
				      aname, atargetName, &InStatus,
				      (struct AFSFid *)&newFid.Fid, 
				      OutFidStatus, OutDirStatus, &tsync);
		    RX_AFS_GLOCK();
	    	}
		XSTATS_END_TIME;
	    } else
		code = -1;
	} while (afs_Analyze
		    (tc, rxconn, code, &adp->f.fid, treq, AFS_STATS_FS_RPCIDX_SYMLINK,
		     SHARED_LOCK, NULL));
    } else {
	newFid.Cell = adp->f.fid.Cell;
	newFid.Fid.Volume = adp->f.fid.Fid.Volume;
	afs_GenFakeFid(&newFid, VREG, 0);
    }

    ObtainWriteLock(&afs_xvcache, 40);
    if (code) {
	if (code < 0) {
	    afs_StaleVCache(adp);
	}
	ReleaseWriteLock(&adp->lock);
	ReleaseWriteLock(&afs_xvcache);
	if (tdc) {
	    ReleaseWriteLock(&tdc->lock);
	    afs_PutDCache(tdc);
	}
	goto done;
    }
    /* otherwise, we should see if we can make the change to the dir locally */
    if (AFS_IS_DISCON_RW || afs_LocalHero(adp, tdc, OutDirStatus, 1)) {
	/* we can do it locally */
	ObtainWriteLock(&afs_xdcache, 293);
	/* If the following fails because the name has been created in the meantime, the
	 * directory is out-of-date - the file server knows best! */
	code = afs_dir_Create(tdc, aname, &newFid.Fid);
	ReleaseWriteLock(&afs_xdcache);
	if (code && !AFS_IS_DISCON_RW) {
	    ZapDCE(tdc);	/* surprise error -- use invalid value */
	    DZap(tdc);
	}
    }
    if (tdc) {
	ReleaseWriteLock(&tdc->lock);
	afs_PutDCache(tdc);
    }
    newFid.Cell = adp->f.fid.Cell;
    newFid.Fid.Volume = adp->f.fid.Fid.Volume;
    ReleaseWriteLock(&adp->lock);

    /* now we're done with parent dir, create the link's entry.  Note that
     * no one can get a pointer to the new cache entry until we release 
     * the xvcache lock. */
    tvc = afs_NewVCache(&newFid, hostp);
    if (!tvc)
    {
	code = -2;
	ReleaseWriteLock(&afs_xvcache);
	goto done;
    }
    ObtainWriteLock(&tvc->lock, 157);
    ObtainWriteLock(&afs_xcbhash, 500);
    tvc->f.states |= CStatd;	/* have valid info */
    tvc->f.states &= ~CBulkFetching;

    if (adp->f.states & CForeign) {
	tvc->f.states |= CForeign;
	/* We don't have to worry about losing the callback since we're doing it 
	 * under the afs_xvcache lock actually, afs_NewVCache may drop the 
	 * afs_xvcache lock, if it calls afs_FlushVCache */
	tvc->cbExpires = CallBack.ExpirationTime + now;
	afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp);
    } else {
	tvc->cbExpires = 0x7fffffff;	/* never expires, they can't change */
	/* since it never expires, we don't have to queue the callback */
    }
    ReleaseWriteLock(&afs_xcbhash);

    if (AFS_IS_DISCON_RW) {
	attrs->va_mode = InStatus.UnixModeBits;
	afs_GenDisconStatus(adp, tvc, &newFid, attrs, treq, VLNK);
	code = afs_DisconCreateSymlink(tvc, atargetName, treq);
	if (code) {
	    /* XXX - When this goes wrong, we need to tidy up the changes we made to
	     * the parent, and get rid of the vcache we just created */
	    ReleaseWriteLock(&tvc->lock);
	    ReleaseWriteLock(&afs_xvcache);
	    afs_PutVCache(tvc);
	    goto done;
	}
	afs_DisconAddDirty(tvc, VDisconCreate, 0);
    } else {
	afs_ProcessFS(tvc, OutFidStatus, treq);
    }

    if (!tvc->linkData) {
	tvc->linkData = afs_osi_Alloc(alen);
	osi_Assert(tvc->linkData != NULL);
	strncpy(tvc->linkData, atargetName, alen - 1);
	tvc->linkData[alen - 1] = 0;
    }
    ReleaseWriteLock(&tvc->lock);
    ReleaseWriteLock(&afs_xvcache);
    if (tvcp)
	*tvcp = tvc;
    else
	afs_PutVCache(tvc);
    code = 0;
  done:
    afs_PutFakeStat(&fakestate);
    if (volp)
	afs_PutVolume(volp, READ_LOCK);
    AFS_DISCON_UNLOCK();
    code = afs_CheckCode(code, treq, 31);
    afs_DestroyReq(treq);
  done2:
    osi_FreeSmallSpace(OutFidStatus);
    osi_FreeSmallSpace(OutDirStatus);
    return code;
}
예제 #2
0
/* question: does afs_create need to set CDirty in the adp or the avc?
 * I think we can get away without it, but I'm not sure.  Note that
 * afs_setattr is called in here for truncation.
 */
#ifdef AFS_SGI64_ENV
int
afs_create(OSI_VC_DECL(adp), char *aname, struct vattr *attrs, int flags,
	   int amode, struct vcache **avcp, afs_ucred_t *acred)
#else /* AFS_SGI64_ENV */
int
afs_create(OSI_VC_DECL(adp), char *aname, struct vattr *attrs,
	   enum vcexcl aexcl, int amode, struct vcache **avcp,
	   afs_ucred_t *acred)
#endif				/* AFS_SGI64_ENV */
{
    afs_int32 origCBs, origZaps, finalZaps;
    struct vrequest *treq = NULL;
    afs_int32 code;
    struct afs_conn *tc;
    struct VenusFid newFid;
    struct AFSStoreStatus InStatus;
    struct AFSFetchStatus *OutFidStatus, *OutDirStatus;
    struct AFSVolSync tsync;
    struct AFSCallBack CallBack;
    afs_int32 now;
    struct dcache *tdc;
    afs_size_t offset, len;
    struct server *hostp = 0;
    struct vcache *tvc;
    struct volume *volp = 0;
    struct afs_fakestat_state fakestate;
    struct rx_connection *rxconn;
    XSTATS_DECLS;
    OSI_VC_CONVERT(adp);

    AFS_STATCNT(afs_create);

    OutFidStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
    OutDirStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
    memset(&InStatus, 0, sizeof(InStatus));

    if ((code = afs_CreateReq(&treq, acred)))
	goto done2;

    afs_Trace3(afs_iclSetp, CM_TRACE_CREATE, ICL_TYPE_POINTER, adp,
	       ICL_TYPE_STRING, aname, ICL_TYPE_INT32, amode);

    afs_InitFakeStat(&fakestate);

#ifdef AFS_SGI65_ENV
    /* If avcp is passed not null, it's the old reference to this file.
     * We can use this to avoid create races. For now, just decrement
     * the reference count on it.
     */
    if (*avcp) {
	AFS_RELE(AFSTOV(*avcp));
	*avcp = NULL;
    }
#endif

    if (strlen(aname) > AFSNAMEMAX) {
	code = ENAMETOOLONG;
	goto done3;
    }

    if (!afs_ENameOK(aname)) {
	code = EINVAL;
	goto done3;
    }
    switch (attrs->va_type) {
    case VBLK:
    case VCHR:
#if	!defined(AFS_SUN5_ENV)
    case VSOCK:
#endif
    case VFIFO:
	/* We don't support special devices or FIFOs */
	code = EINVAL;
	goto done3;
    default:
	;
    }
    AFS_DISCON_LOCK();

    code = afs_EvalFakeStat(&adp, &fakestate, treq);
    if (code)
	goto done;
  tagain:
    code = afs_VerifyVCache(adp, treq);
    if (code)
	goto done;

    /** If the volume is read-only, return error without making an RPC to the
      * fileserver
      */
    if (adp->f.states & CRO) {
	code = EROFS;
	goto done;
    }

    if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) {
        code = ENETDOWN;
        goto done;
    }

    tdc = afs_GetDCache(adp, (afs_size_t) 0, treq, &offset, &len, 1);
    ObtainWriteLock(&adp->lock, 135);
    if (tdc)
	ObtainSharedLock(&tdc->lock, 630);

    /*
     * Make sure that the data in the cache is current. We may have
     * received a callback while we were waiting for the write lock.
     */
    if (!(adp->f.states & CStatd)
	|| (tdc && !hsame(adp->f.m.DataVersion, tdc->f.versionNo))) {
	ReleaseWriteLock(&adp->lock);
	if (tdc) {
	    ReleaseSharedLock(&tdc->lock);
	    afs_PutDCache(tdc);
	}
	goto tagain;
    }
    if (tdc) {
	/* see if file already exists.  If it does, we only set 
	 * the size attributes (to handle O_TRUNC) */
	code = afs_dir_Lookup(tdc, aname, &newFid.Fid);	/* use dnlc first xxx */
	if (code == 0) {
	    ReleaseSharedLock(&tdc->lock);
	    afs_PutDCache(tdc);
	    ReleaseWriteLock(&adp->lock);
#ifdef AFS_SGI64_ENV
	    if (flags & VEXCL) {
#else
	    if (aexcl != NONEXCL) {
#endif
		code = EEXIST;	/* file exists in excl mode open */
		goto done;
	    }
	    /* found the file, so use it */
	    newFid.Cell = adp->f.fid.Cell;
	    newFid.Fid.Volume = adp->f.fid.Fid.Volume;
	    tvc = NULL;
	    if (newFid.Fid.Unique == 0) {
		tvc = afs_LookupVCache(&newFid, treq, NULL, adp, aname);
	    }
	    if (!tvc)		/* lookup failed or wasn't called */
		tvc = afs_GetVCache(&newFid, treq, NULL, NULL);

	    if (tvc) {
		/* if the thing exists, we need the right access to open it.
		 * we must check that here, since no other checks are
		 * made by the open system call */
		len = attrs->va_size;	/* only do the truncate */
		/*
		 * We used to check always for READ access before; the
		 * problem is that we will fail if the existing file
		 * has mode -w-w-w, which is wrong.
		 */
		if ((amode & VREAD)
		    && !afs_AccessOK(tvc, PRSFS_READ, treq, CHECK_MODE_BITS)) {
		    afs_PutVCache(tvc);
		    code = EACCES;
		    goto done;
		}
#if defined(AFS_DARWIN80_ENV)
		if ((amode & VWRITE) || VATTR_IS_ACTIVE(attrs, va_data_size))
#elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
		if ((amode & VWRITE) || (attrs->va_mask & AT_SIZE))
#else
		if ((amode & VWRITE) || len != 0xffffffff)
#endif
		{
		    /* needed for write access check */
		    tvc->f.parent.vnode = adp->f.fid.Fid.Vnode;
		    tvc->f.parent.unique = adp->f.fid.Fid.Unique;
		    /* need write mode for these guys */
		    if (!afs_AccessOK
			(tvc, PRSFS_WRITE, treq, CHECK_MODE_BITS)) {
			afs_PutVCache(tvc);
			code = EACCES;
			goto done;
		    }
		}
#if defined(AFS_DARWIN80_ENV)
		if (VATTR_IS_ACTIVE(attrs, va_data_size))
#elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
		if (attrs->va_mask & AT_SIZE)
#else
		if (len != 0xffffffff)
#endif
		{
		    if (vType(tvc) != VREG) {
			afs_PutVCache(tvc);
			code = EISDIR;
			goto done;
		    }
		    /* do a truncate */
#if defined(AFS_DARWIN80_ENV)
		    VATTR_INIT(attrs);
		    VATTR_SET_SUPPORTED(attrs, va_data_size);
		    VATTR_SET_ACTIVE(attrs, va_data_size);
#elif defined(UKERNEL)
		    attrs->va_mask = ATTR_SIZE;
#elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
		    attrs->va_mask = AT_SIZE;
#else
		    VATTR_NULL(attrs);
#endif
		    attrs->va_size = len;
		    ObtainWriteLock(&tvc->lock, 136);
		    tvc->f.states |= CCreating;
		    ReleaseWriteLock(&tvc->lock);
#if defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
#if defined(AFS_SGI64_ENV)
		    code =
			afs_setattr(VNODE_TO_FIRST_BHV((vnode_t *) tvc),
				    attrs, 0, acred);
#else
		    code = afs_setattr(tvc, attrs, 0, acred);
#endif /* AFS_SGI64_ENV */
#else /* SUN5 || SGI */
		    code = afs_setattr(tvc, attrs, acred);
#endif /* SUN5 || SGI */
		    ObtainWriteLock(&tvc->lock, 137);
		    tvc->f.states &= ~CCreating;
		    ReleaseWriteLock(&tvc->lock);
		    if (code) {
			afs_PutVCache(tvc);
			goto done;
		    }
		}
		*avcp = tvc;
	    } else
		code = ENOENT;	/* shouldn't get here */
	    /* make sure vrefCount bumped only if code == 0 */
	    goto done;
	}
    }
    
    /* if we create the file, we don't do any access checks, since
     * that's how O_CREAT is supposed to work */
    if (adp->f.states & CForeign) {
	origCBs = afs_allCBs;
	origZaps = afs_allZaps;
    } else {
	origCBs = afs_evenCBs;	/* if changes, we don't really have a callback */
	origZaps = afs_evenZaps;	/* number of even numbered vnodes discarded */
    }
    InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE | AFS_SETGROUP;
    InStatus.ClientModTime = osi_Time();
    InStatus.Group = (afs_int32) afs_cr_gid(acred);
    if (AFS_NFSXLATORREQ(acred)) {
	/*
	 * XXX The following is mainly used to fix a bug in the HP-UX
	 * nfs client where they create files with mode of 0 without
	 * doing any setattr later on to fix it.  * XXX
	 */
#if	defined(AFS_AIX_ENV)
	if (attrs->va_mode != -1) {
#else
#if	defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
	if (attrs->va_mask & AT_MODE) {
#else
	if (attrs->va_mode != ((unsigned short)-1)) {
#endif
#endif
	    if (!attrs->va_mode)
		attrs->va_mode = 0x1b6;	/* XXX default mode: rw-rw-rw XXX */
	}
    }

    if (!AFS_IS_DISCONNECTED) {
	/* If not disconnected, connect to the server.*/

    	InStatus.UnixModeBits = attrs->va_mode & 0xffff;	/* only care about protection bits */
    	do {
	    tc = afs_Conn(&adp->f.fid, treq, SHARED_LOCK, &rxconn);
	    if (tc) {
	    	hostp = tc->srvr->server;	/* remember for callback processing */
	    	now = osi_Time();
	    	XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_CREATEFILE);
	    	RX_AFS_GUNLOCK();
	    	code =
		    RXAFS_CreateFile(rxconn, (struct AFSFid *)&adp->f.fid.Fid,
				 aname, &InStatus, (struct AFSFid *)
				 &newFid.Fid, OutFidStatus, OutDirStatus,
				 &CallBack, &tsync);
	    	RX_AFS_GLOCK();
	    	XSTATS_END_TIME;
	    	CallBack.ExpirationTime += now;
	    } else
	    	code = -1;
    	} while (afs_Analyze
	         (tc, rxconn, code, &adp->f.fid, treq, AFS_STATS_FS_RPCIDX_CREATEFILE,
	          SHARED_LOCK, NULL));

	if ((code == EEXIST || code == UAEEXIST) &&
#ifdef AFS_SGI64_ENV
    	!(flags & VEXCL)
#else /* AFS_SGI64_ENV */
    	aexcl == NONEXCL
#endif
    	) {
	    /* if we get an EEXIST in nonexcl mode, just do a lookup */
	    if (tdc) {
	    	ReleaseSharedLock(&tdc->lock);
	    	afs_PutDCache(tdc);
	    }
	    ReleaseWriteLock(&adp->lock);


#if defined(AFS_SGI64_ENV)
	    code = afs_lookup(VNODE_TO_FIRST_BHV((vnode_t *) adp), aname, avcp,
				  NULL, 0, NULL, acred);
#elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
	    code = afs_lookup(adp, aname, avcp, NULL, 0, NULL, acred);
#elif defined(UKERNEL)
	    code = afs_lookup(adp, aname, avcp, acred, 0);
#elif !defined(AFS_DARWIN_ENV)
	    code = afs_lookup(adp, aname, avcp, acred);
#endif
	goto done;
        }

	if (code) {
	    if (code < 0) {
	    	ObtainWriteLock(&afs_xcbhash, 488);
	    	afs_DequeueCallback(adp);
	    	adp->f.states &= ~CStatd;
	    	ReleaseWriteLock(&afs_xcbhash);
	    	osi_dnlc_purgedp(adp);
	    }
	    ReleaseWriteLock(&adp->lock);
	    if (tdc) {
	    	ReleaseSharedLock(&tdc->lock);
	    	afs_PutDCache(tdc);
	    }
	goto done;
	}

    } else {
	/* Generate a fake FID for disconnected mode. */
	newFid.Cell = adp->f.fid.Cell;
	newFid.Fid.Volume = adp->f.fid.Fid.Volume;
	afs_GenFakeFid(&newFid, VREG, 1);
    }				/* if (!AFS_IS_DISCON_RW) */

    /* otherwise, we should see if we can make the change to the dir locally */
    if (tdc)
	UpgradeSToWLock(&tdc->lock, 631);
    if (AFS_IS_DISCON_RW || afs_LocalHero(adp, tdc, OutDirStatus, 1)) {
	/* we can do it locally */
	ObtainWriteLock(&afs_xdcache, 291);
	code = afs_dir_Create(tdc, aname, &newFid.Fid);
	ReleaseWriteLock(&afs_xdcache);
	if (code) {
	    ZapDCE(tdc);
	    DZap(tdc);
	}
    }
    if (tdc) {
	ReleaseWriteLock(&tdc->lock);
	afs_PutDCache(tdc);
    }
    if (AFS_IS_DISCON_RW)
	adp->f.m.LinkCount++;

    newFid.Cell = adp->f.fid.Cell;
    newFid.Fid.Volume = adp->f.fid.Fid.Volume;
    ReleaseWriteLock(&adp->lock);
    volp = afs_FindVolume(&newFid, READ_LOCK);

    /* New tricky optimistic callback handling algorithm for file creation works
     * as follows.  We create the file essentially with no locks set at all.  File
     * server may thus handle operations from others cache managers as well as from
     * this very own cache manager that reference the file in question before
     * we managed to create the cache entry.  However, if anyone else changes
     * any of the status information for a file, we'll see afs_evenCBs increase
     * (files always have even fids).  If someone on this workstation manages
     * to do something to the file, they'll end up having to create a cache
     * entry for the new file.  Either we'll find it once we've got the afs_xvcache
     * lock set, or it was also *deleted* the vnode before we got there, in which case
     * we will find evenZaps has changed, too.  Thus, we only assume we have the right
     * status information if no callbacks or vnode removals have occurred to even
     * numbered files from the time the call started until the time that we got the xvcache
     * lock set.  Of course, this also assumes that any call that modifies a file first
     * gets a write lock on the file's vnode, but if that weren't true, the whole cache manager
     * would fail, since no call would be able to update the local vnode status after modifying
     * a file on a file server. */
    ObtainWriteLock(&afs_xvcache, 138);
    if (adp->f.states & CForeign)
	finalZaps = afs_allZaps;	/* do this before calling newvcache */
    else
	finalZaps = afs_evenZaps;	/* do this before calling newvcache */
    /* don't need to call RemoveVCB, since only path leaving a callback is the
     * one where we pass through afs_NewVCache.  Can't have queued a VCB unless
     * we created and freed an entry between file creation time and here, and the
     * freeing of the vnode will change evenZaps.  Don't need to update the VLRU
     * queue, since the find will only succeed in the event of a create race, and 
     * then the vcache will be at the front of the VLRU queue anyway...  */
    if (!(tvc = afs_FindVCache(&newFid, 0, DO_STATS))) {
	tvc = afs_NewVCache(&newFid, hostp);
	if (tvc) {
	    int finalCBs;
	    ObtainWriteLock(&tvc->lock, 139);

	    ObtainWriteLock(&afs_xcbhash, 489);
	    finalCBs = afs_evenCBs;
	    /* add the callback in */
	    if (adp->f.states & CForeign) {
		tvc->f.states |= CForeign;
		finalCBs = afs_allCBs;
	    }
	    if (origCBs == finalCBs && origZaps == finalZaps) {
		tvc->f.states |= CStatd;	/* we've fake entire thing, so don't stat */
		tvc->f.states &= ~CBulkFetching;
		if (!AFS_IS_DISCON_RW) {
		    tvc->cbExpires = CallBack.ExpirationTime;
		    afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp);
		}
	    } else {
		afs_DequeueCallback(tvc);
		tvc->f.states &= ~(CStatd | CUnique);
		tvc->callback = 0;
		if (tvc->f.fid.Fid.Vnode & 1 || (vType(tvc) == VDIR))
		    osi_dnlc_purgedp(tvc);
	    }
	    ReleaseWriteLock(&afs_xcbhash);
	    if (AFS_IS_DISCON_RW) {
		afs_DisconAddDirty(tvc, VDisconCreate, 0);
		afs_GenDisconStatus(adp, tvc, &newFid, attrs, treq, VREG);
	    } else {
		afs_ProcessFS(tvc, OutFidStatus, treq);
	    }

	    tvc->f.parent.vnode = adp->f.fid.Fid.Vnode;
	    tvc->f.parent.unique = adp->f.fid.Fid.Unique;
#if !defined(UKERNEL)
            if (volp && (volp->states & VPartVisible))
                tvc->f.states |= CPartVisible;
#endif
	    ReleaseWriteLock(&tvc->lock);
	    *avcp = tvc;
	    code = 0;
	} else
	    code = ENOENT;
    } else {
	/* otherwise cache entry already exists, someone else must
	 * have created it.  Comments used to say:  "don't need write
	 * lock to *clear* these flags" but we should do it anyway.
	 * Code used to clear stat bit and callback, but I don't see 
	 * the point -- we didn't have a create race, somebody else just
	 * snuck into NewVCache before we got here, probably a racing 
	 * lookup.
	 */
	*avcp = tvc;
	code = 0;
    }
    ReleaseWriteLock(&afs_xvcache);

  done:
    AFS_DISCON_UNLOCK();

  done3:
    if (volp)
	afs_PutVolume(volp, READ_LOCK);

    if (code == 0) {
	if (afs_mariner)
	    afs_AddMarinerName(aname, *avcp);
	/* return the new status in vattr */
	afs_CopyOutAttrs(*avcp, attrs);
	if (afs_mariner)
	    afs_MarinerLog("store$Creating", *avcp);
    }

    afs_PutFakeStat(&fakestate);
    code = afs_CheckCode(code, treq, 20);
    afs_DestroyReq(treq);

  done2:
    osi_FreeSmallSpace(OutFidStatus);
    osi_FreeSmallSpace(OutDirStatus);
    return code;
}


/*
 * Check to see if we can track the change locally: requires that
 * we have sufficiently recent info in data cache.  If so, we
 * know the new DataVersion number, and place it correctly in both the
 * data and stat cache entries.  This routine returns 1 if we should
 * do the operation locally, and 0 otherwise.
 *
 * This routine must be called with the stat cache entry write-locked,
 * and dcache entry write-locked.
 */
int
afs_LocalHero(struct vcache *avc, struct dcache *adc,
	      AFSFetchStatus * astat, int aincr)
{
    afs_int32 ok;
    afs_hyper_t avers;

    AFS_STATCNT(afs_LocalHero);
    hset64(avers, astat->dataVersionHigh, astat->DataVersion);
    /* avers *is* the version number now, no matter what */

    if (adc) {
	/* does what's in the dcache *now* match what's in the vcache *now*,
	 * and do we have a valid callback? if not, our local copy is not "ok" */
	ok = (hsame(avc->f.m.DataVersion, adc->f.versionNo) && avc->callback
	      && (avc->f.states & CStatd) && avc->cbExpires >= osi_Time());
    } else {
	ok = 0;
    }
    if (ok) {
	/* check that the DV on the server is what we expect it to be */
	afs_hyper_t newDV;
	hset(newDV, adc->f.versionNo);
	hadd32(newDV, aincr);
	if (!hsame(avers, newDV)) {
	    ok = 0;
	}
    }
#if defined(AFS_SGI_ENV)
    osi_Assert(avc->v.v_type == VDIR);
#endif
    /* The bulk status code used the length as a sequence number.  */
    /* Don't update the vcache entry unless the stats are current. */
    if (avc->f.states & CStatd) {
	hset(avc->f.m.DataVersion, avers);
#ifdef AFS_64BIT_CLIENT
	FillInt64(avc->f.m.Length, astat->Length_hi, astat->Length);
#else /* AFS_64BIT_CLIENT */
	avc->f.m.Length = astat->Length;
#endif /* AFS_64BIT_CLIENT */
	avc->f.m.Date = astat->ClientModTime;
    }
    if (ok) {
	/* we've been tracking things correctly */
	adc->dflags |= DFEntryMod;
	adc->f.versionNo = avers;
	return 1;
    } else {
	if (adc) {
	    ZapDCE(adc);
	    DZap(adc);
	}
	if (avc->f.states & CStatd) {
	    osi_dnlc_purgedp(avc);
	}
	return 0;
    }
}
예제 #3
0
int
afs_mkdir(OSI_VC_DECL(adp), char *aname, struct vattr *attrs, 
     struct vcache **avcp, afs_ucred_t *acred)
{
    struct vrequest *treq = NULL;
    afs_int32 code;
    struct afs_conn *tc;
    struct rx_connection *rxconn;
    struct VenusFid newFid;
    struct dcache *tdc;
    struct dcache *new_dc;
    afs_size_t offset, len;
    struct vcache *tvc;
    struct AFSStoreStatus InStatus;
    struct AFSFetchStatus *OutFidStatus, *OutDirStatus;
    struct AFSCallBack CallBack;
    struct AFSVolSync tsync;
    afs_int32 now;
    struct afs_fakestat_state fakestate;
    XSTATS_DECLS;
    OSI_VC_CONVERT(adp);

    AFS_STATCNT(afs_mkdir);
    afs_Trace2(afs_iclSetp, CM_TRACE_MKDIR, ICL_TYPE_POINTER, adp,
	       ICL_TYPE_STRING, aname);

    OutFidStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
    OutDirStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
    memset(&InStatus, 0, sizeof(InStatus));

    if ((code = afs_CreateReq(&treq, acred)))
	goto done2;
    afs_InitFakeStat(&fakestate);

    if (strlen(aname) > AFSNAMEMAX) {
	code = ENAMETOOLONG;
	goto done3;
    }

    if (!afs_ENameOK(aname)) {
	code = EINVAL;
	goto done3;
    }
    
    AFS_DISCON_LOCK();

    code = afs_EvalFakeStat(&adp, &fakestate, treq);
    if (code)
	goto done;
    code = afs_VerifyVCache(adp, treq);
    if (code)
	goto done;

    /** If the volume is read-only, return error without making an RPC to the
      * fileserver
      */
    if (adp->f.states & CRO) {
	code = EROFS;
	goto done;
    }
   
    if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) {
	/*printf("Network is down in afs_mkdir\n");*/
	code = ENETDOWN;
	goto done;
    }
    InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE | AFS_SETGROUP;
    InStatus.ClientModTime = osi_Time();
    InStatus.UnixModeBits = attrs->va_mode & 0xffff;	/* only care about protection bits */
    InStatus.Group = (afs_int32) afs_cr_gid(acred);
    tdc = afs_GetDCache(adp, (afs_size_t) 0, treq, &offset, &len, 1);
    ObtainWriteLock(&adp->lock, 153);

    if (!AFS_IS_DISCON_RW) {
    	do {
	    tc = afs_Conn(&adp->f.fid, treq, SHARED_LOCK, &rxconn);
	    if (tc) {
	    	XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_MAKEDIR);
	    	now = osi_Time();
	    	RX_AFS_GUNLOCK();
	    	code =
		    RXAFS_MakeDir(rxconn,
		    		(struct AFSFid *)&adp->f.fid.Fid,
				aname,
				&InStatus,
				(struct AFSFid *)&newFid.Fid,
				OutFidStatus,
				OutDirStatus,
				&CallBack,
				&tsync);
	    	RX_AFS_GLOCK();
	    	XSTATS_END_TIME;
	    	CallBack.ExpirationTime += now;
	    	/* DON'T forget to Set the callback value... */
	    } else
	    	code = -1;
    	} while (afs_Analyze
		    (tc, rxconn, code, &adp->f.fid, treq, AFS_STATS_FS_RPCIDX_MAKEDIR,
		     SHARED_LOCK, NULL));

    	if (code) {
	    if (code < 0) {
		afs_StaleVCache(adp);
	    }
	    ReleaseWriteLock(&adp->lock);
	    if (tdc)
	    	afs_PutDCache(tdc);
	    goto done;
        }

    } else {
    	/* Disconnected. */

	/* We have the dir entry now, we can use it while disconnected. */
	if (adp->mvid.target_root == NULL) {
	    /* If not mount point, generate a new fid. */
	    newFid.Cell = adp->f.fid.Cell;
    	    newFid.Fid.Volume = adp->f.fid.Fid.Volume;
	    afs_GenFakeFid(&newFid, VDIR, 1);
	}
    	/* XXX: If mount point???*/

	/* Operations with the actual dir's cache entry are further
	 * down, where the dir entry gets created.
	 */
    }			/* if (!AFS_IS_DISCON_RW) */

    /* otherwise, we should see if we can make the change to the dir locally */
    if (tdc)
	ObtainWriteLock(&tdc->lock, 632);
    if (AFS_IS_DISCON_RW || afs_LocalHero(adp, tdc, OutDirStatus, 1)) {
	/* we can do it locally */
	ObtainWriteLock(&afs_xdcache, 294);
	code = afs_dir_Create(tdc, aname, &newFid.Fid);
	ReleaseWriteLock(&afs_xdcache);
	if (code) {
	    ZapDCE(tdc);	/* surprise error -- use invalid value */
	    DZap(tdc);
	}
    }
    if (tdc) {
	ReleaseWriteLock(&tdc->lock);
	afs_PutDCache(tdc);
    }

    if (AFS_IS_DISCON_RW)
	/* We will have to settle with the local link count. */
	adp->f.m.LinkCount++;
    else
	adp->f.m.LinkCount = OutDirStatus->LinkCount;
    newFid.Cell = adp->f.fid.Cell;
    newFid.Fid.Volume = adp->f.fid.Fid.Volume;
    ReleaseWriteLock(&adp->lock);
    if (AFS_IS_DISCON_RW) {
    	/* When disconnected, we have to create the full dir here. */

	/* Generate a new vcache and fill it. */
	tvc = afs_NewVCache(&newFid, NULL);
	if (tvc) {
	    *avcp = tvc;
	} else {
	    code = EIO;
	    goto done;
	}

	ObtainWriteLock(&tvc->lock, 738);
	afs_GenDisconStatus(adp, tvc, &newFid, attrs, treq, VDIR);
	ReleaseWriteLock(&tvc->lock);

	/* And now make an empty dir, containing . and .. : */
	/* Get a new dcache for it first. */
	new_dc = afs_GetDCache(tvc, (afs_size_t) 0, treq, &offset, &len, 1);
	if (!new_dc) {
	    /* printf("afs_mkdir: can't get new dcache for dir.\n"); */
	    code = EIO;
	    goto done;
	}

	ObtainWriteLock(&afs_xdcache, 739);
	code = afs_dir_MakeDir(new_dc,
			       (afs_int32 *) &newFid.Fid,
			       (afs_int32 *) &adp->f.fid.Fid);
	ReleaseWriteLock(&afs_xdcache);
	/* if (code) printf("afs_mkdir: afs_dirMakeDir code = %u\n", code); */

	afs_PutDCache(new_dc);

	ObtainWriteLock(&tvc->lock, 731);
	/* Update length in the vcache. */
	tvc->f.m.Length = new_dc->f.chunkBytes;

	afs_DisconAddDirty(tvc, VDisconCreate, 1);
	ReleaseWriteLock(&tvc->lock);
    } else {
    	/* now we're done with parent dir, create the real dir's cache entry */
	tvc = afs_GetVCache(&newFid, treq, NULL, NULL);
    	if (tvc) {
	    code = 0;
	    *avcp = tvc;

	} else {
	    /* For some reason, we cannot fetch the vcache for our
	     * newly-created dir. */
	    code = EIO;
	}
    }				/* if (AFS_DISCON_RW) */

  done:
    AFS_DISCON_UNLOCK();
  done3:
    afs_PutFakeStat(&fakestate);
    code = afs_CheckCode(code, treq, 26);
    afs_DestroyReq(treq);
  done2:
    osi_FreeSmallSpace(OutFidStatus);
    osi_FreeSmallSpace(OutDirStatus);
    return code;
}