fs/nfsd/blocklayout.c

   1 /*
   2  * Copyright (c) 2014-2016 Christoph Hellwig.
   3  */
   4 #include <linux/exportfs.h>
   5 #include <linux/iomap.h>
   6 #include <linux/genhd.h>
   7 #include <linux/slab.h>
   8 #include <linux/pr.h>
   9
  10 #include <linux/nfsd/debug.h>
  11 #include <scsi/scsi_proto.h>
  12 #include <scsi/scsi_common.h>
  13
  14 #include "blocklayoutxdr.h"
  15 #include "pnfs.h"
  16
  17 #define NFSDDBG_FACILITY        NFSDDBG_PNFS
  18
  19
  20 static __be32
  21 nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
  22                 struct nfsd4_layoutget *args)
  23 {
  24         struct nfsd4_layout_seg *seg = &args->lg_seg;
  25         struct super_block *sb = inode->i_sb;
  26         u32 block_size = (1 << inode->i_blkbits);
  27         struct pnfs_block_extent *bex;
  28         struct iomap iomap;
  29         u32 device_generation = 0;
  30         int error;
  31
  32         if (seg->offset & (block_size - 1)) {
  33                 dprintk("pnfsd: I/O misaligned\n");
  34                 goto out_layoutunavailable;
  35         }
  36
  37         /*
  38          * Some clients barf on non-zero block numbers for NONE or INVALID
  39          * layouts, so make sure to zero the whole structure.
  40          */
  41         error = -ENOMEM;
  42         bex = kzalloc(sizeof(*bex), GFP_KERNEL);
  43         if (!bex)
  44                 goto out_error;
  45         args->lg_content = bex;
  46
  47         error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length,
  48                                             &iomap, seg->iomode != IOMODE_READ,
  49                                             &device_generation);
  50         if (error) {
  51                 if (error == -ENXIO)
  52                         goto out_layoutunavailable;
  53                 goto out_error;
  54         }
  55
  56         if (iomap.length < args->lg_minlength) {
  57                 dprintk("pnfsd: extent smaller than minlength\n");
  58                 goto out_layoutunavailable;
  59         }
  60
  61         switch (iomap.type) {
  62         case IOMAP_MAPPED:
  63                 if (seg->iomode == IOMODE_READ)
  64                         bex->es = PNFS_BLOCK_READ_DATA;
  65                 else
  66                         bex->es = PNFS_BLOCK_READWRITE_DATA;
  67                 bex->soff = (iomap.blkno << 9);
  68                 break;
  69         case IOMAP_UNWRITTEN:
  70                 if (seg->iomode & IOMODE_RW) {
  71                         /*
  72                          * Crack monkey special case from section 2.3.1.
  73                          */
  74                         if (args->lg_minlength == 0) {
  75                                 dprintk("pnfsd: no soup for you!\n");
  76                                 goto out_layoutunavailable;
  77                         }
  78
  79                         bex->es = PNFS_BLOCK_INVALID_DATA;
  80                         bex->soff = (iomap.blkno << 9);
  81                         break;
  82                 }
  83                 /*FALLTHRU*/
  84         case IOMAP_HOLE:
  85                 if (seg->iomode == IOMODE_READ) {
  86                         bex->es = PNFS_BLOCK_NONE_DATA;
  87                         break;
  88                 }
  89                 /*FALLTHRU*/
  90         case IOMAP_DELALLOC:
  91         default:
  92                 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type);
  93                 goto out_layoutunavailable;
  94         }
  95
  96         error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation);
  97         if (error)
  98                 goto out_error;
  99         bex->foff = iomap.offset;
 100         bex->len = iomap.length;
 101
 102         seg->offset = iomap.offset;
 103         seg->length = iomap.length;
 104
 105         dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es);
 106         return 0;
 107
 108 out_error:
 109         seg->length = 0;
 110         return nfserrno(error);
 111 out_layoutunavailable:
 112         seg->length = 0;
 113         return nfserr_layoutunavailable;
 114 }
 115
 116 static __be32
 117 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp,
 118                 struct iomap *iomaps, int nr_iomaps)
 119 {
 120         loff_t new_size = lcp->lc_last_wr + 1;
 121         struct iattr iattr = { .ia_valid = 0 };
 122         int error;
 123
 124         if (lcp->lc_mtime.tv_nsec == UTIME_NOW ||
 125             timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0)
 126                 lcp->lc_mtime = current_time(inode);
 127         iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME;
 128         iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime;
 129
 130         if (new_size > i_size_read(inode)) {
 131                 iattr.ia_valid |= ATTR_SIZE;
 132                 iattr.ia_size = new_size;
 133         }
 134
 135         error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps,
 136                         nr_iomaps, &iattr);
 137         kfree(iomaps);
 138         return nfserrno(error);
 139 }
 140
 141 #ifdef CONFIG_NFSD_BLOCKLAYOUT
 142 static int
 143 nfsd4_block_get_device_info_simple(struct super_block *sb,
 144                 struct nfsd4_getdeviceinfo *gdp)
 145 {
 146         struct pnfs_block_deviceaddr *dev;
 147         struct pnfs_block_volume *b;
 148
 149         dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
 150                       sizeof(struct pnfs_block_volume), GFP_KERNEL);
 151         if (!dev)
 152                 return -ENOMEM;
 153         gdp->gd_device = dev;
 154
 155         dev->nr_volumes = 1;
 156         b = &dev->volumes[0];
 157
 158         b->type = PNFS_BLOCK_VOLUME_SIMPLE;
 159         b->simple.sig_len = PNFS_BLOCK_UUID_LEN;
 160         return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len,
 161                         &b->simple.offset);
 162 }
 163
 164 static __be32
 165 nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
 166                 struct svc_rqst *rqstp,
 167                 struct nfs4_client *clp,
 168                 struct nfsd4_getdeviceinfo *gdp)
 169 {
 170         if (sb->s_bdev != sb->s_bdev->bd_contains)
 171                 return nfserr_inval;
 172         return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
 173 }
 174
 175 static __be32
 176 nfsd4_block_proc_layoutcommit(struct inode *inode,
 177                 struct nfsd4_layoutcommit *lcp)
 178 {
 179         struct iomap *iomaps;
 180         int nr_iomaps;
 181
 182         nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout,
 183                         lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits);
 184         if (nr_iomaps < 0)
 185                 return nfserrno(nr_iomaps);
 186
 187         return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
 188 }
 189
 190 const struct nfsd4_layout_ops bl_layout_ops = {
 191         /*
 192          * Pretend that we send notification to the client.  This is a blatant
 193          * lie to force recent Linux clients to cache our device IDs.
 194          * We rarely ever change the device ID, so the harm of leaking deviceids
 195          * for a while isn't too bad.  Unfortunately RFC5661 is a complete mess
 196          * in this regard, but I filed errata 4119 for this a while ago, and
 197          * hopefully the Linux client will eventually start caching deviceids
 198          * without this again.
 199          */
 200         .notify_types           =
 201                         NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
 202         .proc_getdeviceinfo     = nfsd4_block_proc_getdeviceinfo,
 203         .encode_getdeviceinfo   = nfsd4_block_encode_getdeviceinfo,
 204         .proc_layoutget         = nfsd4_block_proc_layoutget,
 205         .encode_layoutget       = nfsd4_block_encode_layoutget,
 206         .proc_layoutcommit      = nfsd4_block_proc_layoutcommit,
 207 };
 208 #endif /* CONFIG_NFSD_BLOCKLAYOUT */
 209
 210 #ifdef CONFIG_NFSD_SCSILAYOUT
 211 static int nfsd4_scsi_identify_device(struct block_device *bdev,
 212                 struct pnfs_block_volume *b)
 213 {
 214         struct request_queue *q = bdev->bd_disk->queue;
 215         struct request *rq;
 216         size_t bufflen = 252, len, id_len;
 217         u8 *buf, *d, type, assoc;
 218         int error;
 219
 220         buf = kzalloc(bufflen, GFP_KERNEL);
 221         if (!buf)
 222                 return -ENOMEM;
 223
 224         rq = blk_get_request(q, READ, GFP_KERNEL);
 225         if (IS_ERR(rq)) {
 226                 error = -ENOMEM;
 227                 goto out_free_buf;
 228         }
 229         blk_rq_set_block_pc(rq);
 230
 231         error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL);
 232         if (error)
 233                 goto out_put_request;
 234
 235         rq->cmd[0] = INQUIRY;
 236         rq->cmd[1] = 1;
 237         rq->cmd[2] = 0x83;
 238         rq->cmd[3] = bufflen >> 8;
 239         rq->cmd[4] = bufflen & 0xff;
 240         rq->cmd_len = COMMAND_SIZE(INQUIRY);
 241
 242         error = blk_execute_rq(rq->q, NULL, rq, 1);
 243         if (error) {
 244                 pr_err("pNFS: INQUIRY 0x83 failed with: %x\n",
 245                         rq->errors);
 246                 goto out_put_request;
 247         }
 248
 249         len = (buf[2] << 8) + buf[3] + 4;
 250         if (len > bufflen) {
 251                 pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n",
 252                         len);
 253                 goto out_put_request;
 254         }
 255
 256         d = buf + 4;
 257         for (d = buf + 4; d < buf + len; d += id_len + 4) {
 258                 id_len = d[3];
 259                 type = d[1] & 0xf;
 260                 assoc = (d[1] >> 4) & 0x3;
 261
 262                 /*
 263                  * We only care about a EUI-64 and NAA designator types
 264                  * with LU association.
 265                  */
 266                 if (assoc != 0x00)
 267                         continue;
 268                 if (type != 0x02 && type != 0x03)
 269                         continue;
 270                 if (id_len != 8 && id_len != 12 && id_len != 16)
 271                         continue;
 272
 273                 b->scsi.code_set = PS_CODE_SET_BINARY;
 274                 b->scsi.designator_type = type == 0x02 ?
 275                         PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA;
 276                 b->scsi.designator_len = id_len;
 277                 memcpy(b->scsi.designator, d + 4, id_len);
 278
 279                 /*
 280                  * If we found a 8 or 12 byte descriptor continue on to
 281                  * see if a 16 byte one is available.  If we find a
 282                  * 16 byte descriptor we're done.
 283                  */
 284                 if (id_len == 16)
 285                         break;
 286         }
 287
 288 out_put_request:
 289         blk_put_request(rq);
 290 out_free_buf:
 291         kfree(buf);
 292         return error;
 293 }
 294
 295 #define NFSD_MDS_PR_KEY         0x0100000000000000ULL
 296
 297 /*
 298  * We use the client ID as a unique key for the reservations.
 299  * This allows us to easily fence a client when recalls fail.
 300  */
 301 static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp)
 302 {
 303         return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id;
 304 }
 305
 306 static int
 307 nfsd4_block_get_device_info_scsi(struct super_block *sb,
 308                 struct nfs4_client *clp,
 309                 struct nfsd4_getdeviceinfo *gdp)
 310 {
 311         struct pnfs_block_deviceaddr *dev;
 312         struct pnfs_block_volume *b;
 313         const struct pr_ops *ops;
 314         int error;
 315
 316         dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
 317                       sizeof(struct pnfs_block_volume), GFP_KERNEL);
 318         if (!dev)
 319                 return -ENOMEM;
 320         gdp->gd_device = dev;
 321
 322         dev->nr_volumes = 1;
 323         b = &dev->volumes[0];
 324
 325         b->type = PNFS_BLOCK_VOLUME_SCSI;
 326         b->scsi.pr_key = nfsd4_scsi_pr_key(clp);
 327
 328         error = nfsd4_scsi_identify_device(sb->s_bdev, b);
 329         if (error)
 330                 return error;
 331
 332         ops = sb->s_bdev->bd_disk->fops->pr_ops;
 333         if (!ops) {
 334                 pr_err("pNFS: device %s does not support PRs.\n",
 335                         sb->s_id);
 336                 return -EINVAL;
 337         }
 338
 339         error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true);
 340         if (error) {
 341                 pr_err("pNFS: failed to register key for device %s.\n",
 342                         sb->s_id);
 343                 return -EINVAL;
 344         }
 345
 346         error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY,
 347                         PR_EXCLUSIVE_ACCESS_REG_ONLY, 0);
 348         if (error) {
 349                 pr_err("pNFS: failed to reserve device %s.\n",
 350                         sb->s_id);
 351                 return -EINVAL;
 352         }
 353
 354         return 0;
 355 }
 356
 357 static __be32
 358 nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb,
 359                 struct svc_rqst *rqstp,
 360                 struct nfs4_client *clp,
 361                 struct nfsd4_getdeviceinfo *gdp)
 362 {
 363         if (sb->s_bdev != sb->s_bdev->bd_contains)
 364                 return nfserr_inval;
 365         return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp));
 366 }
 367 static __be32
 368 nfsd4_scsi_proc_layoutcommit(struct inode *inode,
 369                 struct nfsd4_layoutcommit *lcp)
 370 {
 371         struct iomap *iomaps;
 372         int nr_iomaps;
 373
 374         nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout,
 375                         lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits);
 376         if (nr_iomaps < 0)
 377                 return nfserrno(nr_iomaps);
 378
 379         return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
 380 }
 381
 382 static void
 383 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls)
 384 {
 385         struct nfs4_client *clp = ls->ls_stid.sc_client;
 386         struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev;
 387
 388         bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
 389                         nfsd4_scsi_pr_key(clp), 0, true);
 390 }
 391
 392 const struct nfsd4_layout_ops scsi_layout_ops = {
 393         /*
 394          * Pretend that we send notification to the client.  This is a blatant
 395          * lie to force recent Linux clients to cache our device IDs.
 396          * We rarely ever change the device ID, so the harm of leaking deviceids
 397          * for a while isn't too bad.  Unfortunately RFC5661 is a complete mess
 398          * in this regard, but I filed errata 4119 for this a while ago, and
 399          * hopefully the Linux client will eventually start caching deviceids
 400          * without this again.
 401          */
 402         .notify_types           =
 403                         NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
 404         .proc_getdeviceinfo     = nfsd4_scsi_proc_getdeviceinfo,
 405         .encode_getdeviceinfo   = nfsd4_block_encode_getdeviceinfo,
 406         .proc_layoutget         = nfsd4_block_proc_layoutget,
 407         .encode_layoutget       = nfsd4_block_encode_layoutget,
 408         .proc_layoutcommit      = nfsd4_scsi_proc_layoutcommit,
 409         .fence_client           = nfsd4_scsi_fence_client,
 410 };
 411 #endif /* CONFIG_NFSD_SCSILAYOUT */