LXR linux/fs/nfsd/flexfilelayoutxdr.c

   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}
 117