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
  12 struct ff_idmap {
  13         char buf[11];
  14         int len;
  15 };
  16
  17 __be32
  18 nfsd4_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
  78 nfsd4_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 }