fs/nfsd/blocklayout.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2014-2016 Christoph Hellwig.
   4  */
   5 #include <linux/exportfs.h>
   6 #include <linux/iomap.h>
   7 #include <linux/genhd.h>
   8 #include <linux/slab.h>
   9 #include <linux/pr.h>
  10
  11 #include <linux/nfsd/debug.h>
  12 #include <scsi/scsi_proto.h>
  13 #include <scsi/scsi_common.h>
  14 #include <scsi/scsi_request.h>
  15
  16 #include "blocklayoutxdr.h"
  17 #include "pnfs.h"
  18
  19 #define NFSDDBG_FACILITY        NFSDDBG_PNFS
  20
  21
  22 static __be32
  23 nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
  24                 struct nfsd4_layoutget *args)
  25 {
  26         struct nfsd4_layout_seg *seg = &args->lg_seg;
  27         struct super_block *sb = inode->i_sb;
  28         u32 block_size = i_blocksize(inode);
  29         struct pnfs_block_extent *bex;
  30         struct iomap iomap;
  31         u32 device_generation = 0;
  32         int error;
  33
  34         if (seg->offset & (block_size - 1)) {
  35                 dprintk("pnfsd: I/O misaligned\n");
  36                 goto out_layoutunavailable;
  37         }
  38
  39         /*
  40          * Some clients barf on non-zero block numbers for NONE or INVALID
  41          * layouts, so make sure to zero the whole structure.
  42          */
  43         error = -ENOMEM;
  44         bex = kzalloc(sizeof(*bex), GFP_KERNEL);
  45         if (!bex)
  46                 goto out_error;
  47         args->lg_content = bex;
  48
  49         error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length,
  50                                             &iomap, seg->iomode != IOMODE_READ,
  51                                             &device_generation);
  52         if (error) {
  53                 if (error == -ENXIO)
  54                         goto out_layoutunavailable;
  55                 goto out_error;
  56         }
  57
  58         if (iomap.length < args->lg_minlength) {
  59                 dprintk("pnfsd: extent smaller than minlength\n");
  60                 goto out_layoutunavailable;
  61         }
  62
  63         switch (iomap.type) {
  64         case IOMAP_MAPPED:
  65                 if (seg->iomode == IOMODE_READ)
  66                         bex->es = PNFS_BLOCK_READ_DATA;
  67                 else
  68                         bex->es = PNFS_BLOCK_READWRITE_DATA;
  69                 bex->soff = iomap.addr;
  70                 break;
  71         case IOMAP_UNWRITTEN:
  72                 if (seg->iomode & IOMODE_RW) {
  73                         /*
  74                          * Crack monkey special case from section 2.3.1.
  75                          */
  76                         if (args->lg_minlength == 0) {
  77                                 dprintk("pnfsd: no soup for you!\n");
  78                                 goto out_layoutunavailable;
  79                         }
  80
  81                         bex->es = PNFS_BLOCK_INVALID_DATA;
  82                         bex->soff = iomap.addr;
  83                         break;
  84                 }
  85                 /*FALLTHRU*/
  86         case IOMAP_HOLE:
  87                 if (seg->iomode == IOMODE_READ) {
  88                         bex->es = PNFS_BLOCK_NONE_DATA;
  89                         break;
  90                 }
  91                 /*FALLTHRU*/
  92         case IOMAP_DELALLOC:
  93         default:
  94                 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type);
  95                 goto out_layoutunavailable;
  96         }
  97
  98         error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation);
  99         if (error)
 100                 goto out_error;
 101         bex->foff = iomap.offset;
 102         bex->len = iomap.length;
 103
 104         seg->offset = iomap.offset;
 105         seg->length = iomap.length;
 106
 107         dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es);
 108         return 0;
 109
 110 out_error:
 111         seg->length = 0;
 112         return nfserrno(error);
 113 out_layoutunavailable:
 114         seg->length = 0;
 115         return nfserr_layoutunavailable;
 116 }
 117
 118 static __be32
 119 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp,
 120                 struct iomap *iomaps, int nr_iomaps)
 121 {
 122         loff_t new_size = lcp->lc_last_wr + 1;
 123         struct iattr iattr = { .ia_valid = 0 };
 124         int error;
 125
 126         if (lcp->lc_mtime.tv_nsec == UTIME_NOW ||
 127             timespec64_compare(&lcp->lc_mtime, &inode->i_mtime) < 0)
 128                 lcp->lc_mtime = current_time(inode);
 129         iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME;
 130         iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime;
 131
 132         if (new_size > i_size_read(inode)) {
 133                 iattr.ia_valid |= ATTR_SIZE;
 134                 iattr.ia_size = new_size;
 135         }
 136
 137         error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps,
 138                         nr_iomaps, &iattr);
 139         kfree(iomaps);
 140         return nfserrno(error);
 141 }
 142
 143 #ifdef CONFIG_NFSD_BLOCKLAYOUT
 144 static int
 145 nfsd4_block_get_device_info_simple(struct super_block *sb,
 146                 struct nfsd4_getdeviceinfo *gdp)
 147 {
 148         struct pnfs_block_deviceaddr *dev;
 149         struct pnfs_block_volume *b;
 150
 151         dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
 152                       sizeof(struct pnfs_block_volume), GFP_KERNEL);
 153         if (!dev)
 154                 return -ENOMEM;
 155         gdp->gd_device = dev;
 156
 157         dev->nr_volumes = 1;
 158         b = &dev->volumes[0];
 159
 160         b->type = PNFS_BLOCK_VOLUME_SIMPLE;
 161         b->simple.sig_len = PNFS_BLOCK_UUID_LEN;
 162         return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len,
 163                         &b->simple.offset);
 164 }
 165
 166 static __be32
 167 nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
 168                 struct svc_rqst *rqstp,
 169                 struct nfs4_client *clp,
 170                 struct nfsd4_getdeviceinfo *gdp)
 171 {
 172         if (sb->s_bdev != sb->s_bdev->bd_contains)
 173                 return nfserr_inval;
 174         return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
 175 }
 176
 177 static __be32
 178 nfsd4_block_proc_layoutcommit(struct inode *inode,
 179                 struct nfsd4_layoutcommit *lcp)
 180 {
 181         struct iomap *iomaps;
 182         int nr_iomaps;
 183
 184         nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout,
 185                         lcp->lc_up_len, &iomaps, i_blocksize(inode));
 186         if (nr_iomaps < 0)
 187                 return nfserrno(nr_iomaps);
 188
 189         return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
 190 }
 191
 192 const struct nfsd4_layout_ops bl_layout_ops = {
 193         /*
 194          * Pretend that we send notification to the client.  This is a blatant
 195          * lie to force recent Linux clients to cache our device IDs.
 196          * We rarely ever change the device ID, so the harm of leaking deviceids
 197          * for a while isn't too bad.  Unfortunately RFC5661 is a complete mess
 198          * in this regard, but I filed errata 4119 for this a while ago, and
 199          * hopefully the Linux client will eventually start caching deviceids
 200          * without this again.
 201          */
 202         .notify_types           =
 203                         NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
 204         .proc_getdeviceinfo     = nfsd4_block_proc_getdeviceinfo,
 205         .encode_getdeviceinfo   = nfsd4_block_encode_getdeviceinfo,
 206         .proc_layoutget         = nfsd4_block_proc_layoutget,
 207         .encode_layoutget       = nfsd4_block_encode_layoutget,
 208         .proc_layoutcommit      = nfsd4_block_proc_layoutcommit,
 209 };
 210 #endif /* CONFIG_NFSD_BLOCKLAYOUT */
 211
 212 #ifdef CONFIG_NFSD_SCSILAYOUT
 213 static int nfsd4_scsi_identify_device(struct block_device *bdev,
 214                 struct pnfs_block_volume *b)
 215 {
 216         struct request_queue *q = bdev->bd_disk->queue;
 217         struct request *rq;
 218         struct scsi_request *req;
 219         /*
 220          * The allocation length (passed in bytes 3 and 4 of the INQUIRY
 221          * command descriptor block) specifies the number of bytes that have
 222          * been allocated for the data-in buffer.
 223          * 252 is the highest one-byte value that is a multiple of 4.
 224          * 65532 is the highest two-byte value that is a multiple of 4.
 225          */
 226         size_t bufflen = 252, maxlen = 65532, len, id_len;
 227         u8 *buf, *d, type, assoc;
 228         int retries = 1, error;
 229
 230         if (WARN_ON_ONCE(!blk_queue_scsi_passthrough(q)))
 231                 return -EINVAL;
 232
 233 again:
 234         buf = kzalloc(bufflen, GFP_KERNEL);
 235         if (!buf)
 236                 return -ENOMEM;
 237
 238         rq = blk_get_request(q, REQ_OP_SCSI_IN, 0);
 239         if (IS_ERR(rq)) {
 240                 error = -ENOMEM;
 241                 goto out_free_buf;
 242         }
 243         req = scsi_req(rq);
 244
 245         error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL);
 246         if (error)
 247                 goto out_put_request;
 248
 249         req->cmd[0] = INQUIRY;
 250         req->cmd[1] = 1;
 251         req->cmd[2] = 0x83;
 252         req->cmd[3] = bufflen >> 8;
 253         req->cmd[4] = bufflen & 0xff;
 254         req->cmd_len = COMMAND_SIZE(INQUIRY);
 255
 256         blk_execute_rq(rq->q, NULL, rq, 1);
 257         if (req->result) {
 258                 pr_err("pNFS: INQUIRY 0x83 failed with: %x\n",
 259                         req->result);
 260                 error = -EIO;
 261                 goto out_put_request;
 262         }
 263
 264         len = (buf[2] << 8) + buf[3] + 4;
 265         if (len > bufflen) {
 266                 if (len <= maxlen && retries--) {
 267                         blk_put_request(rq);
 268                         kfree(buf);
 269                         bufflen = len;
 270                         goto again;
 271                 }
 272                 pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n",
 273                         len);
 274                 goto out_put_request;
 275         }
 276
 277         d = buf + 4;
 278         for (d = buf + 4; d < buf + len; d += id_len + 4) {
 279                 id_len = d[3];
 280                 type = d[1] & 0xf;
 281                 assoc = (d[1] >> 4) & 0x3;
 282
 283                 /*
 284                  * We only care about a EUI-64 and NAA designator types
 285                  * with LU association.
 286                  */
 287                 if (assoc != 0x00)
 288                         continue;
 289                 if (type != 0x02 && type != 0x03)
 290                         continue;
 291                 if (id_len != 8 && id_len != 12 && id_len != 16)
 292                         continue;
 293
 294                 b->scsi.code_set = PS_CODE_SET_BINARY;
 295                 b->scsi.designator_type = type == 0x02 ?
 296                         PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA;
 297                 b->scsi.designator_len = id_len;
 298                 memcpy(b->scsi.designator, d + 4, id_len);
 299
 300                 /*
 301                  * If we found a 8 or 12 byte descriptor continue on to
 302                  * see if a 16 byte one is available.  If we find a
 303                  * 16 byte descriptor we're done.
 304                  */
 305                 if (id_len == 16)
 306                         break;
 307         }
 308
 309 out_put_request:
 310         blk_put_request(rq);
 311 out_free_buf:
 312         kfree(buf);
 313         return error;
 314 }
 315
 316 #define NFSD_MDS_PR_KEY         0x0100000000000000ULL
 317
 318 /*
 319  * We use the client ID as a unique key for the reservations.
 320  * This allows us to easily fence a client when recalls fail.
 321  */
 322 static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp)
 323 {
 324         return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id;
 325 }
 326
 327 static int
 328 nfsd4_block_get_device_info_scsi(struct super_block *sb,
 329                 struct nfs4_client *clp,
 330                 struct nfsd4_getdeviceinfo *gdp)
 331 {
 332         struct pnfs_block_deviceaddr *dev;
 333         struct pnfs_block_volume *b;
 334         const struct pr_ops *ops;
 335         int error;
 336
 337         dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
 338                       sizeof(struct pnfs_block_volume), GFP_KERNEL);
 339         if (!dev)
 340                 return -ENOMEM;
 341         gdp->gd_device = dev;
 342
 343         dev->nr_volumes = 1;
 344         b = &dev->volumes[0];
 345
 346         b->type = PNFS_BLOCK_VOLUME_SCSI;
 347         b->scsi.pr_key = nfsd4_scsi_pr_key(clp);
 348
 349         error = nfsd4_scsi_identify_device(sb->s_bdev, b);
 350         if (error)
 351                 return error;
 352
 353         ops = sb->s_bdev->bd_disk->fops->pr_ops;
 354         if (!ops) {
 355                 pr_err("pNFS: device %s does not support PRs.\n",
 356                         sb->s_id);
 357                 return -EINVAL;
 358         }
 359
 360         error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true);
 361         if (error) {
 362                 pr_err("pNFS: failed to register key for device %s.\n",
 363                         sb->s_id);
 364                 return -EINVAL;
 365         }
 366
 367         error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY,
 368                         PR_EXCLUSIVE_ACCESS_REG_ONLY, 0);
 369         if (error) {
 370                 pr_err("pNFS: failed to reserve device %s.\n",
 371                         sb->s_id);
 372                 return -EINVAL;
 373         }
 374
 375         return 0;
 376 }
 377
 378 static __be32
 379 nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb,
 380                 struct svc_rqst *rqstp,
 381                 struct nfs4_client *clp,
 382                 struct nfsd4_getdeviceinfo *gdp)
 383 {
 384         if (sb->s_bdev != sb->s_bdev->bd_contains)
 385                 return nfserr_inval;
 386         return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp));
 387 }
 388 static __be32
 389 nfsd4_scsi_proc_layoutcommit(struct inode *inode,
 390                 struct nfsd4_layoutcommit *lcp)
 391 {
 392         struct iomap *iomaps;
 393         int nr_iomaps;
 394
 395         nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout,
 396                         lcp->lc_up_len, &iomaps, i_blocksize(inode));
 397         if (nr_iomaps < 0)
 398                 return nfserrno(nr_iomaps);
 399
 400         return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
 401 }
 402
 403 static void
 404 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls)
 405 {
 406         struct nfs4_client *clp = ls->ls_stid.sc_client;
 407         struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev;
 408
 409         bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
 410                         nfsd4_scsi_pr_key(clp), 0, true);
 411 }
 412
 413 const struct nfsd4_layout_ops scsi_layout_ops = {
 414         /*
 415          * Pretend that we send notification to the client.  This is a blatant
 416          * lie to force recent Linux clients to cache our device IDs.
 417          * We rarely ever change the device ID, so the harm of leaking deviceids
 418          * for a while isn't too bad.  Unfortunately RFC5661 is a complete mess
 419          * in this regard, but I filed errata 4119 for this a while ago, and
 420          * hopefully the Linux client will eventually start caching deviceids
 421          * without this again.
 422          */
 423         .notify_types           =
 424                         NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
 425         .proc_getdeviceinfo     = nfsd4_scsi_proc_getdeviceinfo,
 426         .encode_getdeviceinfo   = nfsd4_block_encode_getdeviceinfo,
 427         .proc_layoutget         = nfsd4_block_proc_layoutget,
 428         .encode_layoutget       = nfsd4_block_encode_layoutget,
 429         .proc_layoutcommit      = nfsd4_scsi_proc_layoutcommit,
 430         .fence_client           = nfsd4_scsi_fence_client,
 431 };
 432 #endif /* CONFIG_NFSD_SCSILAYOUT */