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                 struct nfsd4_layoutget *lgp)
  20 {
  21         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                 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         p = xdr_reserve_space(xdr, len + sizeof(__be32));
  87         if (!p)
  88                 return nfserr_resource;
  89
  90         for (i = 0; i < dev->nr_volumes; i++) {
  91                 ret = nfsd4_block_encode_volume(xdr, &dev->volumes[i]);
  92                 if (ret < 0)
  93                         return nfserrno(ret);
  94                 len += ret;
  95         }
  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(dev->nr_volumes);
 103         return 0;
 104 }
 105
 106 int
 107 nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
 108                 u32 block_size)
 109 {
 110         struct iomap *iomaps;
 111         u32 nr_iomaps, i;
 112
 113         if (len < sizeof(u32)) {
 114                 dprintk("%s: extent array too small: %u\n", __func__, len);
 115                 return -EINVAL;
 116         }
 117         len -= sizeof(u32);
 118         if (len % PNFS_BLOCK_EXTENT_SIZE) {
 119                 dprintk("%s: extent array invalid: %u\n", __func__, len);
 120                 return -EINVAL;
 121         }
 122
 123         nr_iomaps = be32_to_cpup(p++);
 124         if (nr_iomaps != len / PNFS_BLOCK_EXTENT_SIZE) {
 125                 dprintk("%s: extent array size mismatch: %u/%u\n",
 126                         __func__, len, nr_iomaps);
 127                 return -EINVAL;
 128         }
 129
 130         iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
 131         if (!iomaps) {
 132                 dprintk("%s: failed to allocate extent array\n", __func__);
 133                 return -ENOMEM;
 134         }
 135
 136         for (i = 0; i < nr_iomaps; i++) {
 137                 struct pnfs_block_extent bex;
 138
 139                 memcpy(&bex.vol_id, p, sizeof(struct nfsd4_deviceid));
 140                 p += XDR_QUADLEN(sizeof(struct nfsd4_deviceid));
 141
 142                 p = xdr_decode_hyper(p, &bex.foff);
 143                 if (bex.foff & (block_size - 1)) {
 144                         dprintk("%s: unaligned offset 0x%llx\n",
 145                                 __func__, bex.foff);
 146                         goto fail;
 147                 }
 148                 p = xdr_decode_hyper(p, &bex.len);
 149                 if (bex.len & (block_size - 1)) {
 150                         dprintk("%s: unaligned length 0x%llx\n",
 151                                 __func__, bex.foff);
 152                         goto fail;
 153                 }
 154                 p = xdr_decode_hyper(p, &bex.soff);
 155                 if (bex.soff & (block_size - 1)) {
 156                         dprintk("%s: unaligned disk offset 0x%llx\n",
 157                                 __func__, bex.soff);
 158                         goto fail;
 159                 }
 160                 bex.es = be32_to_cpup(p++);
 161                 if (bex.es != PNFS_BLOCK_READWRITE_DATA) {
 162                         dprintk("%s: incorrect extent state %d\n",
 163                                 __func__, bex.es);
 164                         goto fail;
 165                 }
 166
 167                 iomaps[i].offset = bex.foff;
 168                 iomaps[i].length = bex.len;
 169         }
 170
 171         *iomapp = iomaps;
 172         return nr_iomaps;
 173 fail:
 174         kfree(iomaps);
 175         return -EINVAL;
 176 }
 177
 178 int
 179 nfsd4_scsi_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
 180                 u32 block_size)
 181 {
 182         struct iomap *iomaps;
 183         u32 nr_iomaps, expected, i;
 184
 185         if (len < sizeof(u32)) {
 186                 dprintk("%s: extent array too small: %u\n", __func__, len);
 187                 return -EINVAL;
 188         }
 189
 190         nr_iomaps = be32_to_cpup(p++);
 191         expected = sizeof(__be32) + nr_iomaps * PNFS_SCSI_RANGE_SIZE;
 192         if (len != expected) {
 193                 dprintk("%s: extent array size mismatch: %u/%u\n",
 194                         __func__, len, expected);
 195                 return -EINVAL;
 196         }
 197
 198         iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
 199         if (!iomaps) {
 200                 dprintk("%s: failed to allocate extent array\n", __func__);
 201                 return -ENOMEM;
 202         }
 203
 204         for (i = 0; i < nr_iomaps; i++) {
 205                 u64 val;
 206
 207                 p = xdr_decode_hyper(p, &val);
 208                 if (val & (block_size - 1)) {
 209                         dprintk("%s: unaligned offset 0x%llx\n", __func__, val);
 210                         goto fail;
 211                 }
 212                 iomaps[i].offset = val;
 213
 214                 p = xdr_decode_hyper(p, &val);
 215                 if (val & (block_size - 1)) {
 216                         dprintk("%s: unaligned length 0x%llx\n", __func__, val);
 217                         goto fail;
 218                 }
 219                 iomaps[i].length = val;
 220         }
 221
 222         *iomapp = iomaps;
 223         return nr_iomaps;
 224 fail:
 225         kfree(iomaps);
 226         return -EINVAL;
 227 }