fs/nfsd/blocklayoutxdr.c

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