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