nfs4xdr.c

Linux Kernel 2.6.9 for OMAP1710

 * Encode a READLINK request
 */
static int nfs4_xdr_enc_readlink(struct rpc_rqst *req, uint32_t *p, const struct nfs4_readlink *args)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops = 2,
	};
	int status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	status = encode_putfh(&xdr, args->fh);
	if(status)
		goto out;
	status = encode_readlink(&xdr, args, req);
out:
	return status;
}

/*
 * Encode a READDIR request
 */
static int nfs4_xdr_enc_readdir(struct rpc_rqst *req, uint32_t *p, const struct nfs4_readdir_arg *args)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops = 2,
	};
	int status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	status = encode_putfh(&xdr, args->fh);
	if(status)
		goto out;
	status = encode_readdir(&xdr, args, req);
out:
	return status;
}

/*
 * Encode a READ request
 */
static int nfs4_xdr_enc_read(struct rpc_rqst *req, uint32_t *p, struct nfs_readargs *args)
{
	struct rpc_auth	*auth = req->rq_task->tk_auth;
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops = 2,
	};
	int replen, status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	status = encode_putfh(&xdr, args->fh);
	if (status)
		goto out;
	status = encode_read(&xdr, args);
	if (status)
		goto out;

	/* set up reply kvec
	 *    toplevel status + taglen=0 + rescount + OP_PUTFH + status
	 *       + OP_READ + status + eof + datalen = 9
	 */
	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS4_dec_read_sz) << 2;
	xdr_inline_pages(&req->rq_rcv_buf, replen,
			 args->pages, args->pgbase, args->count);
out:
	return status;
}

/*
 * Encode an SETATTR request
 */
static int nfs4_xdr_enc_setattr(struct rpc_rqst *req, uint32_t *p, struct nfs_setattrargs *args)

{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .nops   = 3,
        };
        int status;

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, &hdr);
        status = encode_putfh(&xdr, args->fh);
        if(status)
                goto out;
        status = encode_setattr(&xdr, args, args->server);
        if(status)
                goto out;
	status = encode_getfattr(&xdr, args->bitmask);
out:
        return status;
}

/*
 * Encode a WRITE request
 */
static int nfs4_xdr_enc_write(struct rpc_rqst *req, uint32_t *p, struct nfs_writeargs *args)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops = 2,
	};
	int status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	status = encode_putfh(&xdr, args->fh);
	if (status)
		goto out;
	status = encode_write(&xdr, args);
out:
	return status;
}

/*
 *  a COMMIT request
 */
static int nfs4_xdr_enc_commit(struct rpc_rqst *req, uint32_t *p, struct nfs_writeargs *args)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops = 2,
	};
	int status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	status = encode_putfh(&xdr, args->fh);
	if (status)
		goto out;
	status = encode_commit(&xdr, args);
out:
	return status;
}

/*
 * FSINFO request
 */
static int nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, uint32_t *p, struct nfs4_fsinfo_arg *args)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops	= 2,
	};
	int status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	status = encode_putfh(&xdr, args->fh);
	if (!status)
		status = encode_fsinfo(&xdr, args->bitmask);
	return status;
}

/*
 * a PATHCONF request
 */
static int nfs4_xdr_enc_pathconf(struct rpc_rqst *req, uint32_t *p, const struct nfs4_pathconf_arg *args)
{
	extern u32 nfs4_pathconf_bitmap[2];
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops = 2,
	};
	int status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	status = encode_putfh(&xdr, args->fh);
	if (!status)
		status = encode_getattr_one(&xdr,
				args->bitmask[0] & nfs4_pathconf_bitmap[0]);
	return status;
}

/*
 * a STATFS request
 */
static int nfs4_xdr_enc_statfs(struct rpc_rqst *req, uint32_t *p, const struct nfs4_statfs_arg *args)
{
	extern u32 nfs4_statfs_bitmap[];
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops = 2,
	};
	int status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	status = encode_putfh(&xdr, args->fh);
	if (status == 0)
		status = encode_getattr_two(&xdr,
				args->bitmask[0] & nfs4_statfs_bitmap[0],
				args->bitmask[1] & nfs4_statfs_bitmap[1]);
	return status;
}

/*
 * GETATTR_BITMAP request
 */
static int nfs4_xdr_enc_server_caps(struct rpc_rqst *req, uint32_t *p, const struct nfs_fh *fhandle)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops = 2,
	};
	int status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	status = encode_putfh(&xdr, fhandle);
	if (status == 0)
		status = encode_getattr_one(&xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
				FATTR4_WORD0_LINK_SUPPORT|
				FATTR4_WORD0_SYMLINK_SUPPORT|
				FATTR4_WORD0_ACLSUPPORT);
	return status;
}

/*
 * a RENEW request
 */
static int nfs4_xdr_enc_renew(struct rpc_rqst *req, uint32_t *p, struct nfs4_client *clp)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops	= 1,
	};

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	return encode_renew(&xdr, clp);
}

/*
 * a SETCLIENTID request
 */
static int nfs4_xdr_enc_setclientid(struct rpc_rqst *req, uint32_t *p, struct nfs4_setclientid *sc)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops	= 1,
	};

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	return encode_setclientid(&xdr, sc);
}

/*
 * a SETCLIENTID_CONFIRM request
 */
static int nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req, uint32_t *p, struct nfs4_client *clp)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops	= 3,
	};
	const u32 lease_bitmap[2] = { FATTR4_WORD0_LEASE_TIME, 0 };
	int status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	status = encode_setclientid_confirm(&xdr, clp);
	if (!status)
		status = encode_putrootfh(&xdr);
	if (!status)
		status = encode_fsinfo(&xdr, lease_bitmap);
	return status;
}

/*
 * DELEGRETURN request
 */
static int nfs4_xdr_enc_delegreturn(struct rpc_rqst *req, uint32_t *p, const struct nfs4_delegreturnargs *args)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.nops = 2,
	};
	int status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, &hdr);
	if ((status = encode_putfh(&xdr, args->fhandle)) == 0)
		status = encode_delegreturn(&xdr, args->stateid);
	return status;
}

/*
 * START OF "GENERIC" DECODE ROUTINES.
 *   These may look a little ugly since they are imported from a "generic"
 * set of XDR encode/decode routines which are intended to be shared by
 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
 *
 * If the pain of reading these is too great, it should be a straightforward
 * task to translate them into Linux-specific versions which are more
 * consistent with the style used in NFSv2/v3...
 */
#define READ32(x)         (x) = ntohl(*p++)
#define READ64(x)         do {			\
	(x) = (u64)ntohl(*p++) << 32;		\
	(x) |= ntohl(*p++);			\
} while (0)
#define READTIME(x)       do {			\
	p++;					\
	(x.tv_sec) = ntohl(*p++);		\
	(x.tv_nsec) = ntohl(*p++);		\
} while (0)
#define COPYMEM(x,nbytes) do {			\
	memcpy((x), p, nbytes);			\
	p += XDR_QUADLEN(nbytes);		\
} while (0)

#define READ_BUF(nbytes)  do { \
	p = xdr_inline_decode(xdr, nbytes); \
	if (!p) { \
		printk(KERN_WARNING "%s: reply buffer overflowed in line %d.", \
			       	__FUNCTION__, __LINE__); \
		return -EIO; \
	} \
} while (0)

static int decode_opaque_inline(struct xdr_stream *xdr, uint32_t *len, char **string)
{
	uint32_t *p;

	READ_BUF(4);
	READ32(*len);
	READ_BUF(*len);
	*string = (char *)p;
	return 0;
}

static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
	uint32_t *p;

	READ_BUF(8);
	READ32(hdr->status);
	READ32(hdr->taglen);
	
	READ_BUF(hdr->taglen + 4);
	hdr->tag = (char *)p;
	p += XDR_QUADLEN(hdr->taglen);
	READ32(hdr->nops);
	return 0;
}

static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
{
	uint32_t *p;
	uint32_t opnum;
	int32_t nfserr;

	READ_BUF(8);
	READ32(opnum);
	if (opnum != expected) {
		printk(KERN_NOTICE
				"nfs4_decode_op_hdr: Server returned operation"
			       	" %d but we issued a request for %d\n",
				opnum, expected);
		return -EIO;
	}
	READ32(nfserr);
	if (nfserr != NFS_OK)
		return -nfs_stat_to_errno(nfserr);
	return 0;
}

/* Dummy routine */
static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs4_client *clp)
{
	uint32_t *p;
	uint32_t strlen;
	char *str;

	READ_BUF(12);
	return decode_opaque_inline(xdr, &strlen, &str);
}

static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
{
	uint32_t bmlen, *p;

	READ_BUF(4);
	READ32(bmlen);

	bitmap[0] = bitmap[1] = 0;
	READ_BUF((bmlen << 2));
	if (bmlen > 0) {
		READ32(bitmap[0]);
		if (bmlen > 1)
			READ32(bitmap[1]);
	}
	return 0;
}

static inline int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, uint32_t **savep)
{
	uint32_t *p;

	READ_BUF(4);
	READ32(*attrlen);
	*savep = xdr->p;
	return 0;
}

static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
{
	if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
		decode_attr_bitmap(xdr, bitmask);
		bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
	} else
		bitmask[0] = bitmask[1] = 0;
	dprintk("%s: bitmask=0x%x%x\n", __FUNCTION__, bitmask[0], bitmask[1]);
	return 0;
}

static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
{
	uint32_t *p;

	*type = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
		READ_BUF(4);
		READ32(*type);
		if (*type < NF4REG || *type > NF4NAMEDATTR) {
			dprintk("%s: bad type %d\n", __FUNCTION__, *type);
			return -EIO;
		}
		bitmap[0] &= ~FATTR4_WORD0_TYPE;
	}
	dprintk("%s: type=0%o\n", __FUNCTION__, nfs_type2fmt[*type].nfs2type);
	return 0;
}

static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
{
	uint32_t *p;

	*change = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
		READ_BUF(8);
		READ64(*change);
		bitmap[0] &= ~FATTR4_WORD0_CHANGE;
	}
	dprintk("%s: change attribute=%Lu\n", __FUNCTION__,
			(unsigned long long)*change);
	return 0;
}

static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
{
	uint32_t *p;

	*size = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
		READ_BUF(8);
		READ64(*size);
		bitmap[0] &= ~FATTR4_WORD0_SIZE;
	}
	dprintk("%s: file size=%Lu\n", __FUNCTION__, (unsigned long long)*size);
	return 0;
}

static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
	uint32_t *p;

	*res = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
		READ_BUF(4);
		READ32(*res);
		bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
	}
	dprintk("%s: link support=%s\n", __FUNCTION__, *res == 0 ? "false" : "true");
	return 0;
}

static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
	uint32_t *p;

	*res = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
		READ_BUF(4);
		READ32(*res);
		bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
	}
	dprintk("%s: symlink support=%s\n", __FUNCTION__, *res == 0 ? "false" : "true");
	return 0;
}

static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fsid *fsid)