nfs4xdr.c

linux 内核源代码

	}  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
		WRITE64((u64)0); /* clientid */
		WRITE32(0); /* length of owner name */
	}
	ADJUST_ARGS();
}

static void
nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
{
	ENCODE_SEQID_OP_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(4 + sizeof(stateid_t));
		WRITE32(lock->lk_resp_stateid.si_generation);
		WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	} else if (nfserr == nfserr_denied)
		nfsd4_encode_lock_denied(resp, &lock->lk_denied);

	ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
}

static void
nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
{
	if (nfserr == nfserr_denied)
		nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
}

static void
nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
{
	ENCODE_SEQID_OP_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(sizeof(stateid_t));
		WRITE32(locku->lu_stateid.si_generation);
		WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	}
				        
	ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
}


static void
nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(20);
		WRITECINFO(link->li_cinfo);
		ADJUST_ARGS();
	}
}


static void
nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
{
	ENCODE_SEQID_OP_HEAD;

	if (nfserr)
		goto out;

	RESERVE_SPACE(36 + sizeof(stateid_t));
	WRITE32(open->op_stateid.si_generation);
	WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
	WRITECINFO(open->op_cinfo);
	WRITE32(open->op_rflags);
	WRITE32(2);
	WRITE32(open->op_bmval[0]);
	WRITE32(open->op_bmval[1]);
	WRITE32(open->op_delegate_type);
	ADJUST_ARGS();

	switch (open->op_delegate_type) {
	case NFS4_OPEN_DELEGATE_NONE:
		break;
	case NFS4_OPEN_DELEGATE_READ:
		RESERVE_SPACE(20 + sizeof(stateid_t));
		WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
		WRITE32(open->op_recall);

		/*
		 * TODO: ACE's in delegations
		 */
		WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
		WRITE32(0);
		WRITE32(0);
		WRITE32(0);   /* XXX: is NULL principal ok? */
		ADJUST_ARGS();
		break;
	case NFS4_OPEN_DELEGATE_WRITE:
		RESERVE_SPACE(32 + sizeof(stateid_t));
		WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
		WRITE32(0);

		/*
		 * TODO: space_limit's in delegations
		 */
		WRITE32(NFS4_LIMIT_SIZE);
		WRITE32(~(u32)0);
		WRITE32(~(u32)0);

		/*
		 * TODO: ACE's in delegations
		 */
		WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
		WRITE32(0);
		WRITE32(0);
		WRITE32(0);   /* XXX: is NULL principal ok? */
		ADJUST_ARGS();
		break;
	default:
		BUG();
	}
	/* XXX save filehandle here */
out:
	ENCODE_SEQID_OP_TAIL(open->op_stateowner);
}

static void
nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
{
	ENCODE_SEQID_OP_HEAD;
				        
	if (!nfserr) {
		RESERVE_SPACE(sizeof(stateid_t));
		WRITE32(oc->oc_resp_stateid.si_generation);
		WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	}

	ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
}

static void
nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
{
	ENCODE_SEQID_OP_HEAD;
				        
	if (!nfserr) {
		RESERVE_SPACE(sizeof(stateid_t));
		WRITE32(od->od_stateid.si_generation);
		WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	}

	ENCODE_SEQID_OP_TAIL(od->od_stateowner);
}

static __be32
nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
		  struct nfsd4_read *read)
{
	u32 eof;
	int v, pn;
	unsigned long maxcount; 
	long len;
	ENCODE_HEAD;

	if (nfserr)
		return nfserr;
	if (resp->xbuf->page_len)
		return nfserr_resource;

	RESERVE_SPACE(8); /* eof flag and byte count */

	maxcount = svc_max_payload(resp->rqstp);
	if (maxcount > read->rd_length)
		maxcount = read->rd_length;

	len = maxcount;
	v = 0;
	while (len > 0) {
		pn = resp->rqstp->rq_resused++;
		resp->rqstp->rq_vec[v].iov_base =
			page_address(resp->rqstp->rq_respages[pn]);
		resp->rqstp->rq_vec[v].iov_len =
			len < PAGE_SIZE ? len : PAGE_SIZE;
		v++;
		len -= PAGE_SIZE;
	}
	read->rd_vlen = v;

	nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
			read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
			&maxcount);

	if (nfserr == nfserr_symlink)
		nfserr = nfserr_inval;
	if (nfserr)
		return nfserr;
	eof = (read->rd_offset + maxcount >=
	       read->rd_fhp->fh_dentry->d_inode->i_size);

	WRITE32(eof);
	WRITE32(maxcount);
	ADJUST_ARGS();
	resp->xbuf->head[0].iov_len = (char*)p
					- (char*)resp->xbuf->head[0].iov_base;
	resp->xbuf->page_len = maxcount;

	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = p;
	resp->xbuf->tail[0].iov_len = 0;
	if (maxcount&3) {
		RESERVE_SPACE(4);
		WRITE32(0);
		resp->xbuf->tail[0].iov_base += maxcount&3;
		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
		ADJUST_ARGS();
	}
	return 0;
}

static __be32
nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
{
	int maxcount;
	char *page;
	ENCODE_HEAD;

	if (nfserr)
		return nfserr;
	if (resp->xbuf->page_len)
		return nfserr_resource;

	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);

	maxcount = PAGE_SIZE;
	RESERVE_SPACE(4);

	/*
	 * XXX: By default, the ->readlink() VFS op will truncate symlinks
	 * if they would overflow the buffer.  Is this kosher in NFSv4?  If
	 * not, one easy fix is: if ->readlink() precisely fills the buffer,
	 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
	 */
	nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
	if (nfserr == nfserr_isdir)
		return nfserr_inval;
	if (nfserr)
		return nfserr;

	WRITE32(maxcount);
	ADJUST_ARGS();
	resp->xbuf->head[0].iov_len = (char*)p
				- (char*)resp->xbuf->head[0].iov_base;
	resp->xbuf->page_len = maxcount;

	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = p;
	resp->xbuf->tail[0].iov_len = 0;
	if (maxcount&3) {
		RESERVE_SPACE(4);
		WRITE32(0);
		resp->xbuf->tail[0].iov_base += maxcount&3;
		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
		ADJUST_ARGS();
	}
	return 0;
}

static __be32
nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
{
	int maxcount;
	loff_t offset;
	__be32 *page, *savep, *tailbase;
	ENCODE_HEAD;

	if (nfserr)
		return nfserr;
	if (resp->xbuf->page_len)
		return nfserr_resource;

	RESERVE_SPACE(8);  /* verifier */
	savep = p;

	/* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
	WRITE32(0);
	WRITE32(0);
	ADJUST_ARGS();
	resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
	tailbase = p;

	maxcount = PAGE_SIZE;
	if (maxcount > readdir->rd_maxcount)
		maxcount = readdir->rd_maxcount;

	/*
	 * Convert from bytes to words, account for the two words already
	 * written, make sure to leave two words at the end for the next
	 * pointer and eof field.
	 */
	maxcount = (maxcount >> 2) - 4;
	if (maxcount < 0) {
		nfserr =  nfserr_toosmall;
		goto err_no_verf;
	}

	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
	readdir->common.err = 0;
	readdir->buflen = maxcount;
	readdir->buffer = page;
	readdir->offset = NULL;

	offset = readdir->rd_cookie;
	nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
			      &offset,
			      &readdir->common, nfsd4_encode_dirent);
	if (nfserr == nfs_ok &&
	    readdir->common.err == nfserr_toosmall &&
	    readdir->buffer == page) 
		nfserr = nfserr_toosmall;
	if (nfserr == nfserr_symlink)
		nfserr = nfserr_notdir;
	if (nfserr)
		goto err_no_verf;

	if (readdir->offset)
		xdr_encode_hyper(readdir->offset, offset);

	p = readdir->buffer;
	*p++ = 0;	/* no more entries */
	*p++ = htonl(readdir->common.err == nfserr_eof);
	resp->xbuf->page_len = ((char*)p) - (char*)page_address(
		resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);

	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = tailbase;
	resp->xbuf->tail[0].iov_len = 0;
	resp->p = resp->xbuf->tail[0].iov_base;
	resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;

	return 0;
err_no_verf:
	p = savep;
	ADJUST_ARGS();
	return nfserr;
}

static void
nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(20);
		WRITECINFO(remove->rm_cinfo);
		ADJUST_ARGS();
	}
}

static void
nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(40);
		WRITECINFO(rename->rn_sinfo);
		WRITECINFO(rename->rn_tinfo);
		ADJUST_ARGS();
	}
}

static void
nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
		     struct nfsd4_secinfo *secinfo)
{
	int i = 0;
	struct svc_export *exp = secinfo->si_exp;
	u32 nflavs;
	struct exp_flavor_info *flavs;
	struct exp_flavor_info def_flavs[2];
	ENCODE_HEAD;

	if (nfserr)
		goto out;
	if (exp->ex_nflavors) {
		flavs = exp->ex_flavors;
		nflavs = exp->ex_nflavors;
	} else { /* Handling of some defaults in absence of real secinfo: */
		flavs = def_flavs;
		if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
			nflavs = 2;
			flavs[0].pseudoflavor = RPC_AUTH_UNIX;
			flavs[1].pseudoflavor = RPC_AUTH_NULL;
		} else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
			nflavs = 1;
			flavs[0].pseudoflavor
					= svcauth_gss_flavor(exp->ex_client);
		} else {
			nflavs = 1;
			flavs[0].pseudoflavor
					= exp->ex_client->flavour->flavour;
		}
	}

	RESERVE_SPACE(4);
	WRITE32(nflavs);
	ADJUST_ARGS();
	for (i = 0; i < nflavs; i++) {
		u32 flav = flavs[i].pseudoflavor;
		struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);

		if (gm) {
			RESERVE_SPACE(4);
			WRITE32(RPC_AUTH_GSS);
			ADJUST_ARGS();
			RESERVE_SPACE(4 + gm->gm_oid.len);
			WRITE32(gm->gm_oid.len);
			WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
			ADJUST_ARGS();
			RESERVE_SPACE(4);
			WRITE32(0); /* qop */
			ADJUST_ARGS();
			RESERVE_SPACE(4);
			WRITE32(gss_pseudoflavor_to_service(gm, flav));
			ADJUST_ARGS();
			gss_mech_put(gm);
		} else {
			RESERVE_SPACE(4);
			WRITE32(flav);
			ADJUST_ARGS();
		}
	}
out:
	if (exp)
		exp_put(exp);
}

/*
 * The SETATTR encode routine is special -- it always encodes a bitmap,
 * regardless of the error status.
 */
static void
nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
{
	ENCODE_HEAD;

	RESERVE_SPACE(12);
	if (nfserr) {
		WRITE32(2);
		WRITE32(0);
		WRITE32(0);
	}
	else {
		WRITE32(2);
		WRITE32(setattr->sa_bmval[0]);
		WRITE32(setattr->sa_bmval[1]);
	}
	ADJUST_ARGS();
}

static void
nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(8 + sizeof(nfs4_verifier));
		WRITEMEM(&scd->se_clientid, 8);
		WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
		ADJUST_ARGS();
	}
	else if (nfserr == nfserr_clid_inuse) {
		RESERVE_SPACE(8);
		WRITE32(0);
		WRITE32(0);
		ADJUST_ARGS();
	}
}

static void
nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(16);
		WRITE32(write->wr_bytes_written);
		WRITE32(write->wr_how_written);
		WRITEMEM(write->wr_verifier.data, 8);
		ADJUST_ARGS();
	}
}

void
nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
	__be32 *statp;
	ENCODE_HEAD;

	RESERVE_SPACE(8);
	WRITE32(op->opnum);
	statp = p++;	/* to be backfilled at the end */
	ADJUST_ARGS();

	switch (op->opnum) {
	case OP_ACCESS:
		nfsd4_encode_access(resp, op->status, &op->u.access);
		break;
	case OP_CLOSE:
		nfsd4_encode_close(resp, op->status, &op->u.close);
		break;
	case OP_COMMIT:
		nfsd4_encode_commit(resp, op->status, &op->u.commit);
		break;
	case OP_CREATE:
		nfsd4_encode_create(resp, op->status, &op->u.create);
		break;
	case OP_DELEGRETUR