fs/nfs/flexfilelayout/flexfilelayoutdev.c

   1 /*
   2  * Device operations for the pnfs nfs4 file layout driver.
   3  *
   4  * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
   5  *
   6  * Tao Peng <bergwolf@primarydata.com>
   7  */
   8
   9 #include <linux/nfs_fs.h>
  10 #include <linux/vmalloc.h>
  11 #include <linux/module.h>
  12 #include <linux/sunrpc/addr.h>
  13
  14 #include "../internal.h"
  15 #include "../nfs4session.h"
  16 #include "flexfilelayout.h"
  17
  18 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
  19
  20 static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO;
  21 static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS;
  22
  23 void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
  24 {
  25         if (mirror_ds)
  26                 nfs4_put_deviceid_node(&mirror_ds->id_node);
  27 }
  28
  29 void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
  30 {
  31         nfs4_print_deviceid(&mirror_ds->id_node.deviceid);
  32         nfs4_pnfs_ds_put(mirror_ds->ds);
  33         kfree_rcu(mirror_ds, id_node.rcu);
  34 }
  35
  36 /* Decode opaque device data and construct new_ds using it */
  37 struct nfs4_ff_layout_ds *
  38 nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
  39                             gfp_t gfp_flags)
  40 {
  41         struct xdr_stream stream;
  42         struct xdr_buf buf;
  43         struct page *scratch;
  44         struct list_head dsaddrs;
  45         struct nfs4_pnfs_ds_addr *da;
  46         struct nfs4_ff_layout_ds *new_ds = NULL;
  47         struct nfs4_ff_ds_version *ds_versions = NULL;
  48         u32 mp_count;
  49         u32 version_count;
  50         __be32 *p;
  51         int i, ret = -ENOMEM;
  52
  53         /* set up xdr stream */
  54         scratch = alloc_page(gfp_flags);
  55         if (!scratch)
  56                 goto out_err;
  57
  58         new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags);
  59         if (!new_ds)
  60                 goto out_scratch;
  61
  62         nfs4_init_deviceid_node(&new_ds->id_node,
  63                                 server,
  64                                 &pdev->dev_id);
  65         INIT_LIST_HEAD(&dsaddrs);
  66
  67         xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
  68         xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
  69
  70         /* multipath count */
  71         p = xdr_inline_decode(&stream, 4);
  72         if (unlikely(!p))
  73                 goto out_err_drain_dsaddrs;
  74         mp_count = be32_to_cpup(p);
  75         dprintk("%s: multipath ds count %d\n", __func__, mp_count);
  76
  77         for (i = 0; i < mp_count; i++) {
  78                 /* multipath ds */
  79                 da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
  80                                             &stream, gfp_flags);
  81                 if (da)
  82                         list_add_tail(&da->da_node, &dsaddrs);
  83         }
  84         if (list_empty(&dsaddrs)) {
  85                 dprintk("%s: no suitable DS addresses found\n",
  86                         __func__);
  87                 ret = -ENOMEDIUM;
  88                 goto out_err_drain_dsaddrs;
  89         }
  90
  91         /* version count */
  92         p = xdr_inline_decode(&stream, 4);
  93         if (unlikely(!p))
  94                 goto out_err_drain_dsaddrs;
  95         version_count = be32_to_cpup(p);
  96         dprintk("%s: version count %d\n", __func__, version_count);
  97
  98         ds_versions = kzalloc(version_count * sizeof(struct nfs4_ff_ds_version),
  99                               gfp_flags);
 100         if (!ds_versions)
 101                 goto out_scratch;
 102
 103         for (i = 0; i < version_count; i++) {
 104                 /* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) +
 105                  * tightly_coupled(4) */
 106                 p = xdr_inline_decode(&stream, 20);
 107                 if (unlikely(!p))
 108                         goto out_err_drain_dsaddrs;
 109                 ds_versions[i].version = be32_to_cpup(p++);
 110                 ds_versions[i].minor_version = be32_to_cpup(p++);
 111                 ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL);
 112                 ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL);
 113                 ds_versions[i].tightly_coupled = be32_to_cpup(p);
 114
 115                 if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE)
 116                         ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE;
 117                 if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)
 118                         ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE;
 119
 120                 if (ds_versions[i].version != 3 || ds_versions[i].minor_version != 0) {
 121                         dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,
 122                                 i, ds_versions[i].version,
 123                                 ds_versions[i].minor_version);
 124                         ret = -EPROTONOSUPPORT;
 125                         goto out_err_drain_dsaddrs;
 126                 }
 127
 128                 dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n",
 129                         __func__, i, ds_versions[i].version,
 130                         ds_versions[i].minor_version,
 131                         ds_versions[i].rsize,
 132                         ds_versions[i].wsize,
 133                         ds_versions[i].tightly_coupled);
 134         }
 135
 136         new_ds->ds_versions = ds_versions;
 137         new_ds->ds_versions_cnt = version_count;
 138
 139         new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
 140         if (!new_ds->ds)
 141                 goto out_err_drain_dsaddrs;
 142
 143         /* If DS was already in cache, free ds addrs */
 144         while (!list_empty(&dsaddrs)) {
 145                 da = list_first_entry(&dsaddrs,
 146                                       struct nfs4_pnfs_ds_addr,
 147                                       da_node);
 148                 list_del_init(&da->da_node);
 149                 kfree(da->da_remotestr);
 150                 kfree(da);
 151         }
 152
 153         __free_page(scratch);
 154         return new_ds;
 155
 156 out_err_drain_dsaddrs:
 157         while (!list_empty(&dsaddrs)) {
 158                 da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
 159                                       da_node);
 160                 list_del_init(&da->da_node);
 161                 kfree(da->da_remotestr);
 162                 kfree(da);
 163         }
 164
 165         kfree(ds_versions);
 166 out_scratch:
 167         __free_page(scratch);
 168 out_err:
 169         kfree(new_ds);
 170
 171         dprintk("%s ERROR: returning %d\n", __func__, ret);
 172         return NULL;
 173 }
 174
 175 static u64
 176 end_offset(u64 start, u64 len)
 177 {
 178         u64 end;
 179
 180         end = start + len;
 181         return end >= start ? end : NFS4_MAX_UINT64;
 182 }
 183
 184 static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
 185                             u64 offset, u64 length)
 186 {
 187         u64 end;
 188
 189         end = max_t(u64, end_offset(err->offset, err->length),
 190                     end_offset(offset, length));
 191         err->offset = min_t(u64, err->offset, offset);
 192         err->length = end - err->offset;
 193 }
 194
 195 static bool ds_error_can_merge(struct nfs4_ff_layout_ds_err *err,  u64 offset,
 196                                u64 length, int status, enum nfs_opnum4 opnum,
 197                                nfs4_stateid *stateid,
 198                                struct nfs4_deviceid *deviceid)
 199 {
 200         return err->status == status && err->opnum == opnum &&
 201                nfs4_stateid_match(&err->stateid, stateid) &&
 202                !memcmp(&err->deviceid, deviceid, sizeof(*deviceid)) &&
 203                end_offset(err->offset, err->length) >= offset &&
 204                err->offset <= end_offset(offset, length);
 205 }
 206
 207 static bool merge_ds_error(struct nfs4_ff_layout_ds_err *old,
 208                            struct nfs4_ff_layout_ds_err *new)
 209 {
 210         if (!ds_error_can_merge(old, new->offset, new->length, new->status,
 211                                 new->opnum, &new->stateid, &new->deviceid))
 212                 return false;
 213
 214         extend_ds_error(old, new->offset, new->length);
 215         return true;
 216 }
 217
 218 static bool
 219 ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
 220                               struct nfs4_ff_layout_ds_err *dserr)
 221 {
 222         struct nfs4_ff_layout_ds_err *err;
 223
 224         list_for_each_entry(err, &flo->error_list, list) {
 225                 if (merge_ds_error(err, dserr)) {
 226                         return true;
 227                 }
 228         }
 229
 230         list_add(&dserr->list, &flo->error_list);
 231         return false;
 232 }
 233
 234 static bool
 235 ff_layout_update_ds_error(struct nfs4_flexfile_layout *flo, u64 offset,
 236                           u64 length, int status, enum nfs_opnum4 opnum,
 237                           nfs4_stateid *stateid, struct nfs4_deviceid *deviceid)
 238 {
 239         bool found = false;
 240         struct nfs4_ff_layout_ds_err *err;
 241
 242         list_for_each_entry(err, &flo->error_list, list) {
 243                 if (ds_error_can_merge(err, offset, length, status, opnum,
 244                                        stateid, deviceid)) {
 245                         found = true;
 246                         extend_ds_error(err, offset, length);
 247                         break;
 248                 }
 249         }
 250
 251         return found;
 252 }
 253
 254 int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
 255                              struct nfs4_ff_layout_mirror *mirror, u64 offset,
 256                              u64 length, int status, enum nfs_opnum4 opnum,
 257                              gfp_t gfp_flags)
 258 {
 259         struct nfs4_ff_layout_ds_err *dserr;
 260         bool needfree;
 261
 262         if (status == 0)
 263                 return 0;
 264
 265         if (mirror->mirror_ds == NULL)
 266                 return -EINVAL;
 267
 268         spin_lock(&flo->generic_hdr.plh_inode->i_lock);
 269         if (ff_layout_update_ds_error(flo, offset, length, status, opnum,
 270                                       &mirror->stateid,
 271                                       &mirror->mirror_ds->id_node.deviceid)) {
 272                 spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
 273                 return 0;
 274         }
 275         spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
 276         dserr = kmalloc(sizeof(*dserr), gfp_flags);
 277         if (!dserr)
 278                 return -ENOMEM;
 279
 280         INIT_LIST_HEAD(&dserr->list);
 281         dserr->offset = offset;
 282         dserr->length = length;
 283         dserr->status = status;
 284         dserr->opnum = opnum;
 285         nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);
 286         memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,
 287                NFS4_DEVICEID4_SIZE);
 288
 289         spin_lock(&flo->generic_hdr.plh_inode->i_lock);
 290         needfree = ff_layout_add_ds_error_locked(flo, dserr);
 291         spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
 292         if (needfree)
 293                 kfree(dserr);
 294
 295         return 0;
 296 }
 297
 298 /* currently we only support AUTH_NONE and AUTH_SYS */
 299 static rpc_authflavor_t
 300 nfs4_ff_layout_choose_authflavor(struct nfs4_ff_layout_mirror *mirror)
 301 {
 302         if (mirror->uid == (u32)-1)
 303                 return RPC_AUTH_NULL;
 304         return RPC_AUTH_UNIX;
 305 }
 306
 307 /* fetch cred for NFSv3 DS */
 308 static int ff_layout_update_mirror_cred(struct nfs4_ff_layout_mirror *mirror,
 309                                       struct nfs4_pnfs_ds *ds)
 310 {
 311         if (ds->ds_clp && !mirror->cred &&
 312             mirror->mirror_ds->ds_versions[0].version == 3) {
 313                 struct rpc_auth *auth = ds->ds_clp->cl_rpcclient->cl_auth;
 314                 struct rpc_cred *cred;
 315                 struct auth_cred acred = {
 316                         .uid = make_kuid(&init_user_ns, mirror->uid),
 317                         .gid = make_kgid(&init_user_ns, mirror->gid),
 318                 };
 319
 320                 /* AUTH_NULL ignores acred */
 321                 cred = auth->au_ops->lookup_cred(auth, &acred, 0);
 322                 if (IS_ERR(cred)) {
 323                         dprintk("%s: lookup_cred failed with %ld\n",
 324                                 __func__, PTR_ERR(cred));
 325                         return PTR_ERR(cred);
 326                 } else {
 327                         if (cmpxchg(&mirror->cred, NULL, cred))
 328                                 put_rpccred(cred);
 329                 }
 330         }
 331         return 0;
 332 }
 333
 334 struct nfs_fh *
 335 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx)
 336 {
 337         struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);
 338         struct nfs_fh *fh = NULL;
 339         struct nfs4_deviceid_node *devid;
 340
 341         if (mirror == NULL || mirror->mirror_ds == NULL ||
 342             mirror->mirror_ds->ds == NULL) {
 343                 printk(KERN_ERR "NFS: %s: No data server for mirror offset index %d\n",
 344                         __func__, mirror_idx);
 345                 if (mirror && mirror->mirror_ds) {
 346                         devid = &mirror->mirror_ds->id_node;
 347                         pnfs_generic_mark_devid_invalid(devid);
 348                 }
 349                 goto out;
 350         }
 351
 352         /* FIXME: For now assume there is only 1 version available for the DS */
 353         fh = &mirror->fh_versions[0];
 354 out:
 355         return fh;
 356 }
 357
 358 /* Upon return, either ds is connected, or ds is NULL */
 359 struct nfs4_pnfs_ds *
 360 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
 361                           bool fail_return)
 362 {
 363         struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
 364         struct nfs4_pnfs_ds *ds = NULL;
 365         struct nfs4_deviceid_node *devid;
 366         struct inode *ino = lseg->pls_layout->plh_inode;
 367         struct nfs_server *s = NFS_SERVER(ino);
 368         unsigned int max_payload;
 369         rpc_authflavor_t flavor;
 370
 371         if (mirror == NULL || mirror->mirror_ds == NULL ||
 372             mirror->mirror_ds->ds == NULL) {
 373                 printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
 374                         __func__, ds_idx);
 375                 if (mirror && mirror->mirror_ds) {
 376                         devid = &mirror->mirror_ds->id_node;
 377                         pnfs_generic_mark_devid_invalid(devid);
 378                 }
 379                 goto out;
 380         }
 381
 382         devid = &mirror->mirror_ds->id_node;
 383         if (ff_layout_test_devid_unavailable(devid))
 384                 goto out;
 385
 386         ds = mirror->mirror_ds->ds;
 387         /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
 388         smp_rmb();
 389         if (ds->ds_clp)
 390                 goto out_update_creds;
 391
 392         flavor = nfs4_ff_layout_choose_authflavor(mirror);
 393
 394         /* FIXME: For now we assume the server sent only one version of NFS
 395          * to use for the DS.
 396          */
 397         nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
 398                              dataserver_retrans,
 399                              mirror->mirror_ds->ds_versions[0].version,
 400                              mirror->mirror_ds->ds_versions[0].minor_version,
 401                              flavor);
 402
 403         /* connect success, check rsize/wsize limit */
 404         if (ds->ds_clp) {
 405                 max_payload =
 406                         nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient),
 407                                        NULL);
 408                 if (mirror->mirror_ds->ds_versions[0].rsize > max_payload)
 409                         mirror->mirror_ds->ds_versions[0].rsize = max_payload;
 410                 if (mirror->mirror_ds->ds_versions[0].wsize > max_payload)
 411                         mirror->mirror_ds->ds_versions[0].wsize = max_payload;
 412         } else {
 413                 ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
 414                                          mirror, lseg->pls_range.offset,
 415                                          lseg->pls_range.length, NFS4ERR_NXIO,
 416                                          OP_ILLEGAL, GFP_NOIO);
 417                 if (fail_return) {
 418                         pnfs_error_mark_layout_for_return(ino, lseg);
 419                         if (ff_layout_has_available_ds(lseg))
 420                                 pnfs_set_retry_layoutget(lseg->pls_layout);
 421                         else
 422                                 pnfs_clear_retry_layoutget(lseg->pls_layout);
 423
 424                 } else {
 425                         if (ff_layout_has_available_ds(lseg))
 426                                 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
 427                                         &lseg->pls_layout->plh_flags);
 428                         else {
 429                                 pnfs_error_mark_layout_for_return(ino, lseg);
 430                                 pnfs_clear_retry_layoutget(lseg->pls_layout);
 431                         }
 432                 }
 433         }
 434 out_update_creds:
 435         if (ff_layout_update_mirror_cred(mirror, ds))
 436                 ds = NULL;
 437 out:
 438         return ds;
 439 }
 440
 441 struct rpc_cred *
 442 ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx,
 443                       struct rpc_cred *mdscred)
 444 {
 445         struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
 446         struct rpc_cred *cred = ERR_PTR(-EINVAL);
 447
 448         if (!nfs4_ff_layout_prepare_ds(lseg, ds_idx, true))
 449                 goto out;
 450
 451         if (mirror && mirror->cred)
 452                 cred = mirror->cred;
 453         else
 454                 cred = mdscred;
 455 out:
 456         return cred;
 457 }
 458
 459 /**
 460 * Find or create a DS rpc client with th MDS server rpc client auth flavor
 461 * in the nfs_client cl_ds_clients list.
 462 */
 463 struct rpc_clnt *
 464 nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx,
 465                                  struct nfs_client *ds_clp, struct inode *inode)
 466 {
 467         struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
 468
 469         switch (mirror->mirror_ds->ds_versions[0].version) {
 470         case 3:
 471                 /* For NFSv3 DS, flavor is set when creating DS connections */
 472                 return ds_clp->cl_rpcclient;
 473         case 4:
 474                 return nfs4_find_or_create_ds_client(ds_clp, inode);
 475         default:
 476                 BUG();
 477         }
 478 }
 479
 480 static bool is_range_intersecting(u64 offset1, u64 length1,
 481                                   u64 offset2, u64 length2)
 482 {
 483         u64 end1 = end_offset(offset1, length1);
 484         u64 end2 = end_offset(offset2, length2);
 485
 486         return (end1 == NFS4_MAX_UINT64 || end1 > offset2) &&
 487                (end2 == NFS4_MAX_UINT64 || end2 > offset1);
 488 }
 489
 490 /* called with inode i_lock held */
 491 int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
 492                               struct xdr_stream *xdr, int *count,
 493                               const struct pnfs_layout_range *range)
 494 {
 495         struct nfs4_ff_layout_ds_err *err, *n;
 496         __be32 *p;
 497
 498         list_for_each_entry_safe(err, n, &flo->error_list, list) {
 499                 if (!is_range_intersecting(err->offset, err->length,
 500                                            range->offset, range->length))
 501                         continue;
 502                 /* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE)
 503                  * + deviceid(NFS4_DEVICEID4_SIZE) + status(4) + opnum(4)
 504                  */
 505                 p = xdr_reserve_space(xdr,
 506                                 24 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE);
 507                 if (unlikely(!p))
 508                         return -ENOBUFS;
 509                 p = xdr_encode_hyper(p, err->offset);
 510                 p = xdr_encode_hyper(p, err->length);
 511                 p = xdr_encode_opaque_fixed(p, &err->stateid,
 512                                             NFS4_STATEID_SIZE);
 513                 p = xdr_encode_opaque_fixed(p, &err->deviceid,
 514                                             NFS4_DEVICEID4_SIZE);
 515                 *p++ = cpu_to_be32(err->status);
 516                 *p++ = cpu_to_be32(err->opnum);
 517                 *count += 1;
 518                 list_del(&err->list);
 519                 dprintk("%s: offset %llu length %llu status %d op %d count %d\n",
 520                         __func__, err->offset, err->length, err->status,
 521                         err->opnum, *count);
 522                 kfree(err);
 523         }
 524
 525         return 0;
 526 }
 527
 528 bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
 529 {
 530         struct nfs4_ff_layout_mirror *mirror;
 531         struct nfs4_deviceid_node *devid;
 532         int idx;
 533
 534         for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
 535                 mirror = FF_LAYOUT_COMP(lseg, idx);
 536                 if (mirror && mirror->mirror_ds) {
 537                         devid = &mirror->mirror_ds->id_node;
 538                         if (!ff_layout_test_devid_unavailable(devid))
 539                                 return true;
 540                 }
 541         }
 542
 543         return false;
 544 }
 545
 546 module_param(dataserver_retrans, uint, 0644);
 547 MODULE_PARM_DESC(dataserver_retrans, "The  number of times the NFSv4.1 client "
 548                         "retries a request before it attempts further "
 549                         " recovery  action.");
 550 module_param(dataserver_timeo, uint, 0644);
 551 MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
 552                         "NFSv4.1  client  waits for a response from a "
 553                         " data server before it retries an NFS request.");