LXR linux/fs/nfsd/flexfilelayoutxdr.c

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