1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2016 Tom Haynes <loghyr@primarydata.com>
  4 */
  5#include <linux/sunrpc/svc.h>
  6#include <linux/nfs4.h>
  7
  8#include "nfsd.h"
  9#include "flexfilelayoutxdr.h"
 10
 11#define NFSDDBG_FACILITY	NFSDDBG_PNFS
 12
 13struct ff_idmap {
 14	char buf[11];
 15	int len;
 16};
 17
 18__be32
 19nfsd4_ff_encode_layoutget(struct xdr_stream *xdr,
 20		struct nfsd4_layoutget *lgp)
 21{
 22	struct pnfs_ff_layout *fl = lgp->lg_content;
 23	int len, mirror_len, ds_len, fh_len;
 24	__be32 *p;
 25
 26	/*
 27	 * Unlike nfsd4_encode_user, we know these will
 28	 * always be stringified.
 29	 */
 30	struct ff_idmap uid;
 31	struct ff_idmap gid;
 32
 33	fh_len = 4 + fl->fh.size;
 34
 35	uid.len = sprintf(uid.buf, "%u", from_kuid(&init_user_ns, fl->uid));
 36	gid.len = sprintf(gid.buf, "%u", from_kgid(&init_user_ns, fl->gid));
 37
 38	/* 8 + len for recording the length, name, and padding */
 39	ds_len = 20 + sizeof(stateid_opaque_t) + 4 + fh_len +
 40		 8 + uid.len + 8 + gid.len;
 41
 42	mirror_len = 4 + ds_len;
 43
 44	/* The layout segment */
 45	len = 20 + mirror_len;
 46
 47	p = xdr_reserve_space(xdr, sizeof(__be32) + len);
 48	if (!p)
 49		return nfserr_toosmall;
 50
 51	*p++ = cpu_to_be32(len);
 52	p = xdr_encode_hyper(p, 0);		/* stripe unit of 1 */
 53
 54	*p++ = cpu_to_be32(1);			/* single mirror */
 55	*p++ = cpu_to_be32(1);			/* single data server */
 56
 57	p = xdr_encode_opaque_fixed(p, &fl->deviceid,
 58			sizeof(struct nfsd4_deviceid));
 59
 60	*p++ = cpu_to_be32(1);			/* efficiency */
 61
 62	*p++ = cpu_to_be32(fl->stateid.si_generation);
 63	p = xdr_encode_opaque_fixed(p, &fl->stateid.si_opaque,
 64				    sizeof(stateid_opaque_t));
 65
 66	*p++ = cpu_to_be32(1);			/* single file handle */
 67	p = xdr_encode_opaque(p, fl->fh.data, fl->fh.size);
 68
 69	p = xdr_encode_opaque(p, uid.buf, uid.len);
 70	p = xdr_encode_opaque(p, gid.buf, gid.len);
 71
 72	*p++ = cpu_to_be32(fl->flags);
 73	*p++ = cpu_to_be32(0);			/* No stats collect hint */
 74
 75	return 0;
 76}
 77
 78__be32
 79nfsd4_ff_encode_getdeviceinfo(struct xdr_stream *xdr,
 80		struct nfsd4_getdeviceinfo *gdp)
 81{
 82	struct pnfs_ff_device_addr *da = gdp->gd_device;
 83	int len;
 84	int ver_len;
 85	int addr_len;
 86	__be32 *p;
 87
 88	/* len + padding for two strings */
 89	addr_len = 16 + da->netaddr.netid_len + da->netaddr.addr_len;
 90	ver_len = 20;
 91
 92	len = 4 + ver_len + 4 + addr_len;
 93
 94	p = xdr_reserve_space(xdr, len + sizeof(__be32));
 95	if (!p)
 96		return nfserr_resource;
 97
 98	/*
 99	 * Fill in the overall length and number of volumes at the beginning
100	 * of the layout.
101	 */
102	*p++ = cpu_to_be32(len);
103	*p++ = cpu_to_be32(1);			/* 1 netaddr */
104	p = xdr_encode_opaque(p, da->netaddr.netid, da->netaddr.netid_len);
105	p = xdr_encode_opaque(p, da->netaddr.addr, da->netaddr.addr_len);
106
107	*p++ = cpu_to_be32(1);			/* 1 versions */
108
109	*p++ = cpu_to_be32(da->version);
110	*p++ = cpu_to_be32(da->minor_version);
111	*p++ = cpu_to_be32(da->rsize);
112	*p++ = cpu_to_be32(da->wsize);
113	*p++ = cpu_to_be32(da->tightly_coupled);
114
115	return 0;
116}