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