fs/nfsd/blocklayoutxdr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2014-2016 Christoph Hellwig.
   4  */
   5 #include <linux/sunrpc/svc.h>
   6 #include <linux/exportfs.h>
   7 #include <linux/iomap.h>
   8 #include <linux/nfs4.h>
   9
  10 #include "nfsd.h"
  11 #include "blocklayoutxdr.h"
  12 #include "vfs.h"
  13
  14 #define NFSDDBG_FACILITY        NFSDDBG_PNFS
  15
  16
  17 __be32
  18 nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
  19                 const struct nfsd4_layoutget *lgp)
  20 {
  21         const struct pnfs_block_extent *b = lgp->lg_content;
  22         int len = sizeof(__be32) + 5 * sizeof(__be64) + sizeof(__be32);
  23         __be32 *p;
  24
  25         p = xdr_reserve_space(xdr, sizeof(__be32) + len);
  26         if (!p)
  27                 return nfserr_toosmall;
  28
  29         *p++ = cpu_to_be32(len);
  30         *p++ = cpu_to_be32(1);          /* we always return a single extent */
  31
  32         p = xdr_encode_opaque_fixed(p, &b->vol_id,
  33                         sizeof(struct nfsd4_deviceid));
  34         p = xdr_encode_hyper(p, b->foff);
  35         p = xdr_encode_hyper(p, b->len);
  36         p = xdr_encode_hyper(p, b->soff);
  37         *p++ = cpu_to_be32(b->es);
  38         return 0;
  39 }
  40
  41 static int
  42 nfsd4_block_encode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
  43 {
  44         __be32 *p;
  45         int len;
  46
  47         switch (b->type) {
  48         case PNFS_BLOCK_VOLUME_SIMPLE:
  49                 len = 4 + 4 + 8 + 4 + (XDR_QUADLEN(b->simple.sig_len) << 2);
  50                 p = xdr_reserve_space(xdr, len);
  51                 if (!p)
  52                         return -ETOOSMALL;
  53
  54                 *p++ = cpu_to_be32(b->type);
  55                 *p++ = cpu_to_be32(1);  /* single signature */
  56                 p = xdr_encode_hyper(p, b->simple.offset);
  57                 p = xdr_encode_opaque(p, b->simple.sig, b->simple.sig_len);
  58                 break;
  59         case PNFS_BLOCK_VOLUME_SCSI:
  60                 len = 4 + 4 + 4 + 4 + (XDR_QUADLEN(b->scsi.designator_len) << 2) + 8;
  61                 p = xdr_reserve_space(xdr, len);
  62                 if (!p)
  63                         return -ETOOSMALL;
  64
  65                 *p++ = cpu_to_be32(b->type);
  66                 *p++ = cpu_to_be32(b->scsi.code_set);
  67                 *p++ = cpu_to_be32(b->scsi.designator_type);
  68                 p = xdr_encode_opaque(p, b->scsi.designator, b->scsi.designator_len);
  69                 p = xdr_encode_hyper(p, b->scsi.pr_key);
  70                 break;
  71         default:
  72                 return -ENOTSUPP;
  73         }
  74
  75         return len;
  76 }
  77
  78 __be32
  79 nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
  80                 const struct nfsd4_getdeviceinfo *gdp)
  81 {
  82         struct pnfs_block_deviceaddr *dev = gdp->gd_device;
  83         int len = sizeof(__be32), ret, i;
  84         __be32 *p;
  85
  86         /*
  87          * See paragraph 5 of RFC 8881 S18.40.3.
  88          */
  89         if (!gdp->gd_maxcount) {
  90                 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
  91                         return nfserr_resource;
  92                 return nfs_ok;
  93         }
  94
  95         p = xdr_reserve_space(xdr, len + sizeof(__be32));
  96         if (!p)
  97                 return nfserr_resource;
  98
  99         for (i = 0; i < dev->nr_volumes; i++) {
 100                 ret = nfsd4_block_encode_volume(xdr, &dev->volumes[i]);
 101                 if (ret < 0)
 102                         return nfserrno(ret);
 103                 len += ret;
 104         }
 105
 106         /*
 107          * Fill in the overall length and number of volumes at the beginning
 108          * of the layout.
 109          */
 110         *p++ = cpu_to_be32(len);
 111         *p++ = cpu_to_be32(dev->nr_volumes);
 112         return 0;
 113 }
 114
 115 int
 116 nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
 117                 u32 block_size)
 118 {
 119         struct iomap *iomaps;
 120         u32 nr_iomaps, i;
 121
 122         if (len < sizeof(u32)) {
 123                 dprintk("%s: extent array too small: %u\n", __func__, len);
 124                 return -EINVAL;
 125         }
 126         len -= sizeof(u32);
 127         if (len % PNFS_BLOCK_EXTENT_SIZE) {
 128                 dprintk("%s: extent array invalid: %u\n", __func__, len);
 129                 return -EINVAL;
 130         }
 131
 132         nr_iomaps = be32_to_cpup(p++);
 133         if (nr_iomaps != len / PNFS_BLOCK_EXTENT_SIZE) {
 134                 dprintk("%s: extent array size mismatch: %u/%u\n",
 135                         __func__, len, nr_iomaps);
 136                 return -EINVAL;
 137         }
 138
 139         iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
 140         if (!iomaps) {
 141                 dprintk("%s: failed to allocate extent array\n", __func__);
 142                 return -ENOMEM;
 143         }
 144
 145         for (i = 0; i < nr_iomaps; i++) {
 146                 struct pnfs_block_extent bex;
 147
 148                 memcpy(&bex.vol_id, p, sizeof(struct nfsd4_deviceid));
 149                 p += XDR_QUADLEN(sizeof(struct nfsd4_deviceid));
 150
 151                 p = xdr_decode_hyper(p, &bex.foff);
 152                 if (bex.foff & (block_size - 1)) {
 153                         dprintk("%s: unaligned offset 0x%llx\n",
 154                                 __func__, bex.foff);
 155                         goto fail;
 156                 }
 157                 p = xdr_decode_hyper(p, &bex.len);
 158                 if (bex.len & (block_size - 1)) {
 159                         dprintk("%s: unaligned length 0x%llx\n",
 160                                 __func__, bex.foff);
 161                         goto fail;
 162                 }
 163                 p = xdr_decode_hyper(p, &bex.soff);
 164                 if (bex.soff & (block_size - 1)) {
 165                         dprintk("%s: unaligned disk offset 0x%llx\n",
 166                                 __func__, bex.soff);
 167                         goto fail;
 168                 }
 169                 bex.es = be32_to_cpup(p++);
 170                 if (bex.es != PNFS_BLOCK_READWRITE_DATA) {
 171                         dprintk("%s: incorrect extent state %d\n",
 172                                 __func__, bex.es);
 173                         goto fail;
 174                 }
 175
 176                 iomaps[i].offset = bex.foff;
 177                 iomaps[i].length = bex.len;
 178         }
 179
 180         *iomapp = iomaps;
 181         return nr_iomaps;
 182 fail:
 183         kfree(iomaps);
 184         return -EINVAL;
 185 }
 186
 187 int
 188 nfsd4_scsi_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
 189                 u32 block_size)
 190 {
 191         struct iomap *iomaps;
 192         u32 nr_iomaps, expected, i;
 193
 194         if (len < sizeof(u32)) {
 195                 dprintk("%s: extent array too small: %u\n", __func__, len);
 196                 return -EINVAL;
 197         }
 198
 199         nr_iomaps = be32_to_cpup(p++);
 200         expected = sizeof(__be32) + nr_iomaps * PNFS_SCSI_RANGE_SIZE;
 201         if (len != expected) {
 202                 dprintk("%s: extent array size mismatch: %u/%u\n",
 203                         __func__, len, expected);
 204                 return -EINVAL;
 205         }
 206
 207         iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
 208         if (!iomaps) {
 209                 dprintk("%s: failed to allocate extent array\n", __func__);
 210                 return -ENOMEM;
 211         }
 212
 213         for (i = 0; i < nr_iomaps; i++) {
 214                 u64 val;
 215
 216                 p = xdr_decode_hyper(p, &val);
 217                 if (val & (block_size - 1)) {
 218                         dprintk("%s: unaligned offset 0x%llx\n", __func__, val);
 219                         goto fail;
 220                 }
 221                 iomaps[i].offset = val;
 222
 223                 p = xdr_decode_hyper(p, &val);
 224                 if (val & (block_size - 1)) {
 225                         dprintk("%s: unaligned length 0x%llx\n", __func__, val);
 226                         goto fail;
 227                 }
 228                 iomaps[i].length = val;
 229         }
 230
 231         *iomapp = iomaps;
 232         return nr_iomaps;
 233 fail:
 234         kfree(iomaps);
 235         return -EINVAL;
 236 }