fs/nfs/flexfilelayout/flexfilelayout.c

   1 /*
   2  * Module for pnfs flexfile 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/nfs_page.h>
  11 #include <linux/module.h>
  12
  13 #include <linux/sunrpc/metrics.h>
  14
  15 #include "flexfilelayout.h"
  16 #include "../nfs4session.h"
  17 #include "../nfs4idmap.h"
  18 #include "../internal.h"
  19 #include "../delegation.h"
  20 #include "../nfs4trace.h"
  21 #include "../iostat.h"
  22 #include "../nfs.h"
  23 #include "../nfs42.h"
  24
  25 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
  26
  27 #define FF_LAYOUT_POLL_RETRY_MAX     (15*HZ)
  28
  29 static struct pnfs_layout_hdr *
  30 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
  31 {
  32         struct nfs4_flexfile_layout *ffl;
  33
  34         ffl = kzalloc(sizeof(*ffl), gfp_flags);
  35         if (ffl) {
  36                 INIT_LIST_HEAD(&ffl->error_list);
  37                 return &ffl->generic_hdr;
  38         } else
  39                 return NULL;
  40 }
  41
  42 static void
  43 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
  44 {
  45         struct nfs4_ff_layout_ds_err *err, *n;
  46
  47         list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
  48                                  list) {
  49                 list_del(&err->list);
  50                 kfree(err);
  51         }
  52         kfree(FF_LAYOUT_FROM_HDR(lo));
  53 }
  54
  55 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
  56 {
  57         __be32 *p;
  58
  59         p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
  60         if (unlikely(p == NULL))
  61                 return -ENOBUFS;
  62         memcpy(stateid, p, NFS4_STATEID_SIZE);
  63         dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
  64                 p[0], p[1], p[2], p[3]);
  65         return 0;
  66 }
  67
  68 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
  69 {
  70         __be32 *p;
  71
  72         p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
  73         if (unlikely(!p))
  74                 return -ENOBUFS;
  75         memcpy(devid, p, NFS4_DEVICEID4_SIZE);
  76         nfs4_print_deviceid(devid);
  77         return 0;
  78 }
  79
  80 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
  81 {
  82         __be32 *p;
  83
  84         p = xdr_inline_decode(xdr, 4);
  85         if (unlikely(!p))
  86                 return -ENOBUFS;
  87         fh->size = be32_to_cpup(p++);
  88         if (fh->size > sizeof(struct nfs_fh)) {
  89                 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
  90                        fh->size);
  91                 return -EOVERFLOW;
  92         }
  93         /* fh.data */
  94         p = xdr_inline_decode(xdr, fh->size);
  95         if (unlikely(!p))
  96                 return -ENOBUFS;
  97         memcpy(&fh->data, p, fh->size);
  98         dprintk("%s: fh len %d\n", __func__, fh->size);
  99
 100         return 0;
 101 }
 102
 103 /*
 104  * Currently only stringified uids and gids are accepted.
 105  * I.e., kerberos is not supported to the DSes, so no pricipals.
 106  *
 107  * That means that one common function will suffice, but when
 108  * principals are added, this should be split to accomodate
 109  * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
 110  */
 111 static int
 112 decode_name(struct xdr_stream *xdr, u32 *id)
 113 {
 114         __be32 *p;
 115         int len;
 116
 117         /* opaque_length(4)*/
 118         p = xdr_inline_decode(xdr, 4);
 119         if (unlikely(!p))
 120                 return -ENOBUFS;
 121         len = be32_to_cpup(p++);
 122         if (len < 0)
 123                 return -EINVAL;
 124
 125         dprintk("%s: len %u\n", __func__, len);
 126
 127         /* opaque body */
 128         p = xdr_inline_decode(xdr, len);
 129         if (unlikely(!p))
 130                 return -ENOBUFS;
 131
 132         if (!nfs_map_string_to_numeric((char *)p, len, id))
 133                 return -EINVAL;
 134
 135         return 0;
 136 }
 137
 138 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
 139 {
 140         int i;
 141
 142         if (fls->mirror_array) {
 143                 for (i = 0; i < fls->mirror_array_cnt; i++) {
 144                         /* normally mirror_ds is freed in
 145                          * .free_deviceid_node but we still do it here
 146                          * for .alloc_lseg error path */
 147                         if (fls->mirror_array[i]) {
 148                                 kfree(fls->mirror_array[i]->fh_versions);
 149                                 nfs4_ff_layout_put_deviceid(fls->mirror_array[i]->mirror_ds);
 150                                 kfree(fls->mirror_array[i]);
 151                         }
 152                 }
 153                 kfree(fls->mirror_array);
 154                 fls->mirror_array = NULL;
 155         }
 156 }
 157
 158 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
 159 {
 160         int ret = 0;
 161
 162         dprintk("--> %s\n", __func__);
 163
 164         /* FIXME: remove this check when layout segment support is added */
 165         if (lgr->range.offset != 0 ||
 166             lgr->range.length != NFS4_MAX_UINT64) {
 167                 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
 168                         __func__);
 169                 ret = -EINVAL;
 170         }
 171
 172         dprintk("--> %s returns %d\n", __func__, ret);
 173         return ret;
 174 }
 175
 176 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
 177 {
 178         if (fls) {
 179                 ff_layout_free_mirror_array(fls);
 180                 kfree(fls);
 181         }
 182 }
 183
 184 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
 185 {
 186         int i, j;
 187
 188         for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
 189                 for (j = i + 1; j < fls->mirror_array_cnt; j++)
 190                         if (fls->mirror_array[i]->efficiency <
 191                             fls->mirror_array[j]->efficiency)
 192                                 swap(fls->mirror_array[i],
 193                                      fls->mirror_array[j]);
 194         }
 195 }
 196
 197 static struct pnfs_layout_segment *
 198 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
 199                      struct nfs4_layoutget_res *lgr,
 200                      gfp_t gfp_flags)
 201 {
 202         struct pnfs_layout_segment *ret;
 203         struct nfs4_ff_layout_segment *fls = NULL;
 204         struct xdr_stream stream;
 205         struct xdr_buf buf;
 206         struct page *scratch;
 207         u64 stripe_unit;
 208         u32 mirror_array_cnt;
 209         __be32 *p;
 210         int i, rc;
 211
 212         dprintk("--> %s\n", __func__);
 213         scratch = alloc_page(gfp_flags);
 214         if (!scratch)
 215                 return ERR_PTR(-ENOMEM);
 216
 217         xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
 218                               lgr->layoutp->len);
 219         xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
 220
 221         /* stripe unit and mirror_array_cnt */
 222         rc = -EIO;
 223         p = xdr_inline_decode(&stream, 8 + 4);
 224         if (!p)
 225                 goto out_err_free;
 226
 227         p = xdr_decode_hyper(p, &stripe_unit);
 228         mirror_array_cnt = be32_to_cpup(p++);
 229         dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
 230                 stripe_unit, mirror_array_cnt);
 231
 232         if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
 233             mirror_array_cnt == 0)
 234                 goto out_err_free;
 235
 236         rc = -ENOMEM;
 237         fls = kzalloc(sizeof(*fls), gfp_flags);
 238         if (!fls)
 239                 goto out_err_free;
 240
 241         fls->mirror_array_cnt = mirror_array_cnt;
 242         fls->stripe_unit = stripe_unit;
 243         fls->mirror_array = kcalloc(fls->mirror_array_cnt,
 244                                     sizeof(fls->mirror_array[0]), gfp_flags);
 245         if (fls->mirror_array == NULL)
 246                 goto out_err_free;
 247
 248         for (i = 0; i < fls->mirror_array_cnt; i++) {
 249                 struct nfs4_deviceid devid;
 250                 struct nfs4_deviceid_node *idnode;
 251                 u32 ds_count;
 252                 u32 fh_count;
 253                 int j;
 254
 255                 rc = -EIO;
 256                 p = xdr_inline_decode(&stream, 4);
 257                 if (!p)
 258                         goto out_err_free;
 259                 ds_count = be32_to_cpup(p);
 260
 261                 /* FIXME: allow for striping? */
 262                 if (ds_count != 1)
 263                         goto out_err_free;
 264
 265                 fls->mirror_array[i] =
 266                         kzalloc(sizeof(struct nfs4_ff_layout_mirror),
 267                                 gfp_flags);
 268                 if (fls->mirror_array[i] == NULL) {
 269                         rc = -ENOMEM;
 270                         goto out_err_free;
 271                 }
 272
 273                 spin_lock_init(&fls->mirror_array[i]->lock);
 274                 fls->mirror_array[i]->ds_count = ds_count;
 275                 fls->mirror_array[i]->lseg = &fls->generic_hdr;
 276
 277                 /* deviceid */
 278                 rc = decode_deviceid(&stream, &devid);
 279                 if (rc)
 280                         goto out_err_free;
 281
 282                 idnode = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),
 283                                                 &devid, lh->plh_lc_cred,
 284                                                 gfp_flags);
 285                 /*
 286                  * upon success, mirror_ds is allocated by previous
 287                  * getdeviceinfo, or newly by .alloc_deviceid_node
 288                  * nfs4_find_get_deviceid failure is indeed getdeviceinfo falure
 289                  */
 290                 if (idnode)
 291                         fls->mirror_array[i]->mirror_ds =
 292                                 FF_LAYOUT_MIRROR_DS(idnode);
 293                 else
 294                         goto out_err_free;
 295
 296                 /* efficiency */
 297                 rc = -EIO;
 298                 p = xdr_inline_decode(&stream, 4);
 299                 if (!p)
 300                         goto out_err_free;
 301                 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
 302
 303                 /* stateid */
 304                 rc = decode_stateid(&stream, &fls->mirror_array[i]->stateid);
 305                 if (rc)
 306                         goto out_err_free;
 307
 308                 /* fh */
 309                 p = xdr_inline_decode(&stream, 4);
 310                 if (!p)
 311                         goto out_err_free;
 312                 fh_count = be32_to_cpup(p);
 313
 314                 fls->mirror_array[i]->fh_versions =
 315                         kzalloc(fh_count * sizeof(struct nfs_fh),
 316                                 gfp_flags);
 317                 if (fls->mirror_array[i]->fh_versions == NULL) {
 318                         rc = -ENOMEM;
 319                         goto out_err_free;
 320                 }
 321
 322                 for (j = 0; j < fh_count; j++) {
 323                         rc = decode_nfs_fh(&stream,
 324                                            &fls->mirror_array[i]->fh_versions[j]);
 325                         if (rc)
 326                                 goto out_err_free;
 327                 }
 328
 329                 fls->mirror_array[i]->fh_versions_cnt = fh_count;
 330
 331                 /* user */
 332                 rc = decode_name(&stream, &fls->mirror_array[i]->uid);
 333                 if (rc)
 334                         goto out_err_free;
 335
 336                 /* group */
 337                 rc = decode_name(&stream, &fls->mirror_array[i]->gid);
 338                 if (rc)
 339                         goto out_err_free;
 340
 341                 dprintk("%s: uid %d gid %d\n", __func__,
 342                         fls->mirror_array[i]->uid,
 343                         fls->mirror_array[i]->gid);
 344         }
 345
 346         p = xdr_inline_decode(&stream, 4);
 347         if (p)
 348                 fls->flags = be32_to_cpup(p);
 349
 350         ff_layout_sort_mirrors(fls);
 351         rc = ff_layout_check_layout(lgr);
 352         if (rc)
 353                 goto out_err_free;
 354
 355         ret = &fls->generic_hdr;
 356         dprintk("<-- %s (success)\n", __func__);
 357 out_free_page:
 358         __free_page(scratch);
 359         return ret;
 360 out_err_free:
 361         _ff_layout_free_lseg(fls);
 362         ret = ERR_PTR(rc);
 363         dprintk("<-- %s (%d)\n", __func__, rc);
 364         goto out_free_page;
 365 }
 366
 367 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
 368 {
 369         struct pnfs_layout_segment *lseg;
 370
 371         list_for_each_entry(lseg, &layout->plh_segs, pls_list)
 372                 if (lseg->pls_range.iomode == IOMODE_RW)
 373                         return true;
 374
 375         return false;
 376 }
 377
 378 static void
 379 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
 380 {
 381         struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
 382         int i;
 383
 384         dprintk("--> %s\n", __func__);
 385
 386         for (i = 0; i < fls->mirror_array_cnt; i++) {
 387                 if (fls->mirror_array[i]) {
 388                         nfs4_ff_layout_put_deviceid(fls->mirror_array[i]->mirror_ds);
 389                         fls->mirror_array[i]->mirror_ds = NULL;
 390                         if (fls->mirror_array[i]->cred) {
 391                                 put_rpccred(fls->mirror_array[i]->cred);
 392                                 fls->mirror_array[i]->cred = NULL;
 393                         }
 394                 }
 395         }
 396
 397         if (lseg->pls_range.iomode == IOMODE_RW) {
 398                 struct nfs4_flexfile_layout *ffl;
 399                 struct inode *inode;
 400
 401                 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
 402                 inode = ffl->generic_hdr.plh_inode;
 403                 spin_lock(&inode->i_lock);
 404                 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
 405                         ffl->commit_info.nbuckets = 0;
 406                         kfree(ffl->commit_info.buckets);
 407                         ffl->commit_info.buckets = NULL;
 408                 }
 409                 spin_unlock(&inode->i_lock);
 410         }
 411         _ff_layout_free_lseg(fls);
 412 }
 413
 414 /* Return 1 until we have multiple lsegs support */
 415 static int
 416 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
 417 {
 418         return 1;
 419 }
 420
 421 static void
 422 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
 423 {
 424         /* first IO request? */
 425         if (atomic_inc_return(&timer->n_ops) == 1) {
 426                 timer->start_time = now;
 427         }
 428 }
 429
 430 static ktime_t
 431 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
 432 {
 433         ktime_t start;
 434
 435         if (atomic_dec_return(&timer->n_ops) < 0)
 436                 WARN_ON_ONCE(1);
 437
 438         start = timer->start_time;
 439         timer->start_time = now;
 440         return ktime_sub(now, start);
 441 }
 442
 443 static bool
 444 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
 445                             struct nfs4_ff_layoutstat *layoutstat,
 446                             ktime_t now)
 447 {
 448         static const ktime_t notime = {0};
 449
 450         nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
 451         if (ktime_equal(mirror->start_time, notime))
 452                 mirror->start_time = now;
 453         if (ktime_equal(mirror->last_report_time, notime))
 454                 mirror->last_report_time = now;
 455         if (ktime_to_ms(ktime_sub(now, mirror->last_report_time)) >=
 456                         FF_LAYOUTSTATS_REPORT_INTERVAL) {
 457                 mirror->last_report_time = now;
 458                 return true;
 459         }
 460
 461         return false;
 462 }
 463
 464 static void
 465 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
 466                 __u64 requested)
 467 {
 468         struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
 469
 470         iostat->ops_requested++;
 471         iostat->bytes_requested += requested;
 472 }
 473
 474 static void
 475 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
 476                 __u64 requested,
 477                 __u64 completed,
 478                 ktime_t time_completed,
 479                 ktime_t time_started)
 480 {
 481         struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
 482         ktime_t completion_time = ktime_sub(time_completed, time_started);
 483         ktime_t timer;
 484
 485         iostat->ops_completed++;
 486         iostat->bytes_completed += completed;
 487         iostat->bytes_not_delivered += requested - completed;
 488
 489         timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
 490         iostat->total_busy_time =
 491                         ktime_add(iostat->total_busy_time, timer);
 492         iostat->aggregate_completion_time =
 493                         ktime_add(iostat->aggregate_completion_time,
 494                                         completion_time);
 495 }
 496
 497 static void
 498 nfs4_ff_layout_stat_io_start_read(struct nfs4_ff_layout_mirror *mirror,
 499                 __u64 requested, ktime_t now)
 500 {
 501         bool report;
 502
 503         spin_lock(&mirror->lock);
 504         report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
 505         nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
 506         spin_unlock(&mirror->lock);
 507
 508         if (report)
 509                 pnfs_report_layoutstat(mirror->lseg->pls_layout->plh_inode,
 510                                 GFP_KERNEL);
 511 }
 512
 513 static void
 514 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
 515                 struct nfs4_ff_layout_mirror *mirror,
 516                 __u64 requested,
 517                 __u64 completed)
 518 {
 519         spin_lock(&mirror->lock);
 520         nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
 521                         requested, completed,
 522                         ktime_get(), task->tk_start);
 523         spin_unlock(&mirror->lock);
 524 }
 525
 526 static void
 527 nfs4_ff_layout_stat_io_start_write(struct nfs4_ff_layout_mirror *mirror,
 528                 __u64 requested, ktime_t now)
 529 {
 530         bool report;
 531
 532         spin_lock(&mirror->lock);
 533         report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
 534         nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
 535         spin_unlock(&mirror->lock);
 536
 537         if (report)
 538                 pnfs_report_layoutstat(mirror->lseg->pls_layout->plh_inode,
 539                                 GFP_NOIO);
 540 }
 541
 542 static void
 543 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
 544                 struct nfs4_ff_layout_mirror *mirror,
 545                 __u64 requested,
 546                 __u64 completed,
 547                 enum nfs3_stable_how committed)
 548 {
 549         if (committed == NFS_UNSTABLE)
 550                 requested = completed = 0;
 551
 552         spin_lock(&mirror->lock);
 553         nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
 554                         requested, completed, ktime_get(), task->tk_start);
 555         spin_unlock(&mirror->lock);
 556 }
 557
 558 static int
 559 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
 560                             struct nfs_commit_info *cinfo,
 561                             gfp_t gfp_flags)
 562 {
 563         struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
 564         struct pnfs_commit_bucket *buckets;
 565         int size;
 566
 567         if (cinfo->ds->nbuckets != 0) {
 568                 /* This assumes there is only one RW lseg per file.
 569                  * To support multiple lseg per file, we need to
 570                  * change struct pnfs_commit_bucket to allow dynamic
 571                  * increasing nbuckets.
 572                  */
 573                 return 0;
 574         }
 575
 576         size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
 577
 578         buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
 579                           gfp_flags);
 580         if (!buckets)
 581                 return -ENOMEM;
 582         else {
 583                 int i;
 584
 585                 spin_lock(cinfo->lock);
 586                 if (cinfo->ds->nbuckets != 0)
 587                         kfree(buckets);
 588                 else {
 589                         cinfo->ds->buckets = buckets;
 590                         cinfo->ds->nbuckets = size;
 591                         for (i = 0; i < size; i++) {
 592                                 INIT_LIST_HEAD(&buckets[i].written);
 593                                 INIT_LIST_HEAD(&buckets[i].committing);
 594                                 /* mark direct verifier as unset */
 595                                 buckets[i].direct_verf.committed =
 596                                         NFS_INVALID_STABLE_HOW;
 597                         }
 598                 }
 599                 spin_unlock(cinfo->lock);
 600                 return 0;
 601         }
 602 }
 603
 604 static struct nfs4_pnfs_ds *
 605 ff_layout_choose_best_ds_for_read(struct nfs_pageio_descriptor *pgio,
 606                                   int *best_idx)
 607 {
 608         struct nfs4_ff_layout_segment *fls;
 609         struct nfs4_pnfs_ds *ds;
 610         int idx;
 611
 612         fls = FF_LAYOUT_LSEG(pgio->pg_lseg);
 613         /* mirrors are sorted by efficiency */
 614         for (idx = 0; idx < fls->mirror_array_cnt; idx++) {
 615                 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, idx, false);
 616                 if (ds) {
 617                         *best_idx = idx;
 618                         return ds;
 619                 }
 620         }
 621
 622         return NULL;
 623 }
 624
 625 static void
 626 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
 627                         struct nfs_page *req)
 628 {
 629         struct nfs_pgio_mirror *pgm;
 630         struct nfs4_ff_layout_mirror *mirror;
 631         struct nfs4_pnfs_ds *ds;
 632         int ds_idx;
 633
 634         /* Use full layout for now */
 635         if (!pgio->pg_lseg)
 636                 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 637                                                    req->wb_context,
 638                                                    0,
 639                                                    NFS4_MAX_UINT64,
 640                                                    IOMODE_READ,
 641                                                    GFP_KERNEL);
 642         /* If no lseg, fall back to read through mds */
 643         if (pgio->pg_lseg == NULL)
 644                 goto out_mds;
 645
 646         ds = ff_layout_choose_best_ds_for_read(pgio, &ds_idx);
 647         if (!ds)
 648                 goto out_mds;
 649         mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
 650
 651         pgio->pg_mirror_idx = ds_idx;
 652
 653         /* read always uses only one mirror - idx 0 for pgio layer */
 654         pgm = &pgio->pg_mirrors[0];
 655         pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
 656
 657         return;
 658 out_mds:
 659         pnfs_put_lseg(pgio->pg_lseg);
 660         pgio->pg_lseg = NULL;
 661         nfs_pageio_reset_read_mds(pgio);
 662 }
 663
 664 static void
 665 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
 666                         struct nfs_page *req)
 667 {
 668         struct nfs4_ff_layout_mirror *mirror;
 669         struct nfs_pgio_mirror *pgm;
 670         struct nfs_commit_info cinfo;
 671         struct nfs4_pnfs_ds *ds;
 672         int i;
 673         int status;
 674
 675         if (!pgio->pg_lseg)
 676                 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 677                                                    req->wb_context,
 678                                                    0,
 679                                                    NFS4_MAX_UINT64,
 680                                                    IOMODE_RW,
 681                                                    GFP_NOFS);
 682         /* If no lseg, fall back to write through mds */
 683         if (pgio->pg_lseg == NULL)
 684                 goto out_mds;
 685
 686         nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
 687         status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
 688         if (status < 0)
 689                 goto out_mds;
 690
 691         /* Use a direct mapping of ds_idx to pgio mirror_idx */
 692         if (WARN_ON_ONCE(pgio->pg_mirror_count !=
 693             FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
 694                 goto out_mds;
 695
 696         for (i = 0; i < pgio->pg_mirror_count; i++) {
 697                 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
 698                 if (!ds)
 699                         goto out_mds;
 700                 pgm = &pgio->pg_mirrors[i];
 701                 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
 702                 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
 703         }
 704
 705         return;
 706
 707 out_mds:
 708         pnfs_put_lseg(pgio->pg_lseg);
 709         pgio->pg_lseg = NULL;
 710         nfs_pageio_reset_write_mds(pgio);
 711 }
 712
 713 static unsigned int
 714 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
 715                                     struct nfs_page *req)
 716 {
 717         if (!pgio->pg_lseg)
 718                 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 719                                                    req->wb_context,
 720                                                    0,
 721                                                    NFS4_MAX_UINT64,
 722                                                    IOMODE_RW,
 723                                                    GFP_NOFS);
 724         if (pgio->pg_lseg)
 725                 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
 726
 727         /* no lseg means that pnfs is not in use, so no mirroring here */
 728         nfs_pageio_reset_write_mds(pgio);
 729         return 1;
 730 }
 731
 732 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
 733         .pg_init = ff_layout_pg_init_read,
 734         .pg_test = pnfs_generic_pg_test,
 735         .pg_doio = pnfs_generic_pg_readpages,
 736         .pg_cleanup = pnfs_generic_pg_cleanup,
 737 };
 738
 739 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
 740         .pg_init = ff_layout_pg_init_write,
 741         .pg_test = pnfs_generic_pg_test,
 742         .pg_doio = pnfs_generic_pg_writepages,
 743         .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
 744         .pg_cleanup = pnfs_generic_pg_cleanup,
 745 };
 746
 747 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
 748 {
 749         struct rpc_task *task = &hdr->task;
 750
 751         pnfs_layoutcommit_inode(hdr->inode, false);
 752
 753         if (retry_pnfs) {
 754                 dprintk("%s Reset task %5u for i/o through pNFS "
 755                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
 756                         hdr->task.tk_pid,
 757                         hdr->inode->i_sb->s_id,
 758                         (unsigned long long)NFS_FILEID(hdr->inode),
 759                         hdr->args.count,
 760                         (unsigned long long)hdr->args.offset);
 761
 762                 if (!hdr->dreq) {
 763                         struct nfs_open_context *ctx;
 764
 765                         ctx = nfs_list_entry(hdr->pages.next)->wb_context;
 766                         set_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
 767                         hdr->completion_ops->error_cleanup(&hdr->pages);
 768                 } else {
 769                         nfs_direct_set_resched_writes(hdr->dreq);
 770                         /* fake unstable write to let common nfs resend pages */
 771                         hdr->verf.committed = NFS_UNSTABLE;
 772                         hdr->good_bytes = hdr->args.count;
 773                 }
 774                 return;
 775         }
 776
 777         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
 778                 dprintk("%s Reset task %5u for i/o through MDS "
 779                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
 780                         hdr->task.tk_pid,
 781                         hdr->inode->i_sb->s_id,
 782                         (unsigned long long)NFS_FILEID(hdr->inode),
 783                         hdr->args.count,
 784                         (unsigned long long)hdr->args.offset);
 785
 786                 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
 787         }
 788 }
 789
 790 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
 791 {
 792         struct rpc_task *task = &hdr->task;
 793
 794         pnfs_layoutcommit_inode(hdr->inode, false);
 795
 796         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
 797                 dprintk("%s Reset task %5u for i/o through MDS "
 798                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
 799                         hdr->task.tk_pid,
 800                         hdr->inode->i_sb->s_id,
 801                         (unsigned long long)NFS_FILEID(hdr->inode),
 802                         hdr->args.count,
 803                         (unsigned long long)hdr->args.offset);
 804
 805                 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
 806         }
 807 }
 808
 809 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
 810                                            struct nfs4_state *state,
 811                                            struct nfs_client *clp,
 812                                            struct pnfs_layout_segment *lseg,
 813                                            int idx)
 814 {
 815         struct pnfs_layout_hdr *lo = lseg->pls_layout;
 816         struct inode *inode = lo->plh_inode;
 817         struct nfs_server *mds_server = NFS_SERVER(inode);
 818
 819         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
 820         struct nfs_client *mds_client = mds_server->nfs_client;
 821         struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
 822
 823         if (task->tk_status >= 0)
 824                 return 0;
 825
 826         switch (task->tk_status) {
 827         /* MDS state errors */
 828         case -NFS4ERR_DELEG_REVOKED:
 829         case -NFS4ERR_ADMIN_REVOKED:
 830         case -NFS4ERR_BAD_STATEID:
 831                 if (state == NULL)
 832                         break;
 833                 nfs_remove_bad_delegation(state->inode);
 834         case -NFS4ERR_OPENMODE:
 835                 if (state == NULL)
 836                         break;
 837                 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
 838                         goto out_bad_stateid;
 839                 goto wait_on_recovery;
 840         case -NFS4ERR_EXPIRED:
 841                 if (state != NULL) {
 842                         if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
 843                                 goto out_bad_stateid;
 844                 }
 845                 nfs4_schedule_lease_recovery(mds_client);
 846                 goto wait_on_recovery;
 847         /* DS session errors */
 848         case -NFS4ERR_BADSESSION:
 849         case -NFS4ERR_BADSLOT:
 850         case -NFS4ERR_BAD_HIGH_SLOT:
 851         case -NFS4ERR_DEADSESSION:
 852         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 853         case -NFS4ERR_SEQ_FALSE_RETRY:
 854         case -NFS4ERR_SEQ_MISORDERED:
 855                 dprintk("%s ERROR %d, Reset session. Exchangeid "
 856                         "flags 0x%x\n", __func__, task->tk_status,
 857                         clp->cl_exchange_flags);
 858                 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
 859                 break;
 860         case -NFS4ERR_DELAY:
 861         case -NFS4ERR_GRACE:
 862                 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
 863                 break;
 864         case -NFS4ERR_RETRY_UNCACHED_REP:
 865                 break;
 866         /* Invalidate Layout errors */
 867         case -NFS4ERR_PNFS_NO_LAYOUT:
 868         case -ESTALE:           /* mapped NFS4ERR_STALE */
 869         case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
 870         case -EISDIR:           /* mapped NFS4ERR_ISDIR */
 871         case -NFS4ERR_FHEXPIRED:
 872         case -NFS4ERR_WRONG_TYPE:
 873                 dprintk("%s Invalid layout error %d\n", __func__,
 874                         task->tk_status);
 875                 /*
 876                  * Destroy layout so new i/o will get a new layout.
 877                  * Layout will not be destroyed until all current lseg
 878                  * references are put. Mark layout as invalid to resend failed
 879                  * i/o and all i/o waiting on the slot table to the MDS until
 880                  * layout is destroyed and a new valid layout is obtained.
 881                  */
 882                 pnfs_destroy_layout(NFS_I(inode));
 883                 rpc_wake_up(&tbl->slot_tbl_waitq);
 884                 goto reset;
 885         /* RPC connection errors */
 886         case -ECONNREFUSED:
 887         case -EHOSTDOWN:
 888         case -EHOSTUNREACH:
 889         case -ENETUNREACH:
 890         case -EIO:
 891         case -ETIMEDOUT:
 892         case -EPIPE:
 893                 dprintk("%s DS connection error %d\n", __func__,
 894                         task->tk_status);
 895                 nfs4_mark_deviceid_unavailable(devid);
 896                 rpc_wake_up(&tbl->slot_tbl_waitq);
 897                 /* fall through */
 898         default:
 899                 if (ff_layout_has_available_ds(lseg))
 900                         return -NFS4ERR_RESET_TO_PNFS;
 901 reset:
 902                 dprintk("%s Retry through MDS. Error %d\n", __func__,
 903                         task->tk_status);
 904                 return -NFS4ERR_RESET_TO_MDS;
 905         }
 906 out:
 907         task->tk_status = 0;
 908         return -EAGAIN;
 909 out_bad_stateid:
 910         task->tk_status = -EIO;
 911         return 0;
 912 wait_on_recovery:
 913         rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
 914         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
 915                 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
 916         goto out;
 917 }
 918
 919 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
 920 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
 921                                            struct pnfs_layout_segment *lseg,
 922                                            int idx)
 923 {
 924         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
 925
 926         if (task->tk_status >= 0)
 927                 return 0;
 928
 929         if (task->tk_status != -EJUKEBOX) {
 930                 dprintk("%s DS connection error %d\n", __func__,
 931                         task->tk_status);
 932                 nfs4_mark_deviceid_unavailable(devid);
 933                 if (ff_layout_has_available_ds(lseg))
 934                         return -NFS4ERR_RESET_TO_PNFS;
 935                 else
 936                         return -NFS4ERR_RESET_TO_MDS;
 937         }
 938
 939         if (task->tk_status == -EJUKEBOX)
 940                 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
 941         task->tk_status = 0;
 942         rpc_restart_call(task);
 943         rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
 944         return -EAGAIN;
 945 }
 946
 947 static int ff_layout_async_handle_error(struct rpc_task *task,
 948                                         struct nfs4_state *state,
 949                                         struct nfs_client *clp,
 950                                         struct pnfs_layout_segment *lseg,
 951                                         int idx)
 952 {
 953         int vers = clp->cl_nfs_mod->rpc_vers->number;
 954
 955         switch (vers) {
 956         case 3:
 957                 return ff_layout_async_handle_error_v3(task, lseg, idx);
 958         case 4:
 959                 return ff_layout_async_handle_error_v4(task, state, clp,
 960                                                        lseg, idx);
 961         default:
 962                 /* should never happen */
 963                 WARN_ON_ONCE(1);
 964                 return 0;
 965         }
 966 }
 967
 968 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
 969                                         int idx, u64 offset, u64 length,
 970                                         u32 status, int opnum)
 971 {
 972         struct nfs4_ff_layout_mirror *mirror;
 973         int err;
 974
 975         mirror = FF_LAYOUT_COMP(lseg, idx);
 976         err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
 977                                        mirror, offset, length, status, opnum,
 978                                        GFP_NOIO);
 979         dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
 980 }
 981
 982 /* NFS_PROTO call done callback routines */
 983
 984 static int ff_layout_read_done_cb(struct rpc_task *task,
 985                                 struct nfs_pgio_header *hdr)
 986 {
 987         struct inode *inode;
 988         int err;
 989
 990         trace_nfs4_pnfs_read(hdr, task->tk_status);
 991         if (task->tk_status == -ETIMEDOUT && !hdr->res.op_status)
 992                 hdr->res.op_status = NFS4ERR_NXIO;
 993         if (task->tk_status < 0 && hdr->res.op_status)
 994                 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
 995                                             hdr->args.offset, hdr->args.count,
 996                                             hdr->res.op_status, OP_READ);
 997         err = ff_layout_async_handle_error(task, hdr->args.context->state,
 998                                            hdr->ds_clp, hdr->lseg,
 999                                            hdr->pgio_mirror_idx);
1000
1001         switch (err) {
1002         case -NFS4ERR_RESET_TO_PNFS:
1003                 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
1004                         &hdr->lseg->pls_layout->plh_flags);
1005                 pnfs_read_resend_pnfs(hdr);
1006                 return task->tk_status;
1007         case -NFS4ERR_RESET_TO_MDS:
1008                 inode = hdr->lseg->pls_layout->plh_inode;
1009                 pnfs_error_mark_layout_for_return(inode, hdr->lseg);
1010                 ff_layout_reset_read(hdr);
1011                 return task->tk_status;
1012         case -EAGAIN:
1013                 rpc_restart_call_prepare(task);
1014                 return -EAGAIN;
1015         }
1016
1017         return 0;
1018 }
1019
1020 static bool
1021 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1022 {
1023         return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1024 }
1025
1026 /*
1027  * We reference the rpc_cred of the first WRITE that triggers the need for
1028  * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1029  * rfc5661 is not clear about which credential should be used.
1030  *
1031  * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1032  * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1033  * we always send layoutcommit after DS writes.
1034  */
1035 static void
1036 ff_layout_set_layoutcommit(struct nfs_pgio_header *hdr)
1037 {
1038         if (!ff_layout_need_layoutcommit(hdr->lseg))
1039                 return;
1040
1041         pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
1042                         hdr->mds_offset + hdr->res.count);
1043         dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
1044                 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
1045 }
1046
1047 static bool
1048 ff_layout_reset_to_mds(struct pnfs_layout_segment *lseg, int idx)
1049 {
1050         /* No mirroring for now */
1051         struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1052
1053         return ff_layout_test_devid_unavailable(node);
1054 }
1055
1056 static int ff_layout_read_prepare_common(struct rpc_task *task,
1057                                          struct nfs_pgio_header *hdr)
1058 {
1059         nfs4_ff_layout_stat_io_start_read(
1060                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1061                         hdr->args.count,
1062                         task->tk_start);
1063
1064         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1065                 rpc_exit(task, -EIO);
1066                 return -EIO;
1067         }
1068         if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1069                 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
1070                 if (ff_layout_has_available_ds(hdr->lseg))
1071                         pnfs_read_resend_pnfs(hdr);
1072                 else
1073                         ff_layout_reset_read(hdr);
1074                 rpc_exit(task, 0);
1075                 return -EAGAIN;
1076         }
1077         hdr->pgio_done_cb = ff_layout_read_done_cb;
1078
1079         return 0;
1080 }
1081
1082 /*
1083  * Call ops for the async read/write cases
1084  * In the case of dense layouts, the offset needs to be reset to its
1085  * original value.
1086  */
1087 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1088 {
1089         struct nfs_pgio_header *hdr = data;
1090
1091         if (ff_layout_read_prepare_common(task, hdr))
1092                 return;
1093
1094         rpc_call_start(task);
1095 }
1096
1097 static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
1098                                     struct nfs4_sequence_args *args,
1099                                     struct nfs4_sequence_res *res,
1100                                     struct rpc_task *task)
1101 {
1102         if (ds_clp->cl_session)
1103                 return nfs41_setup_sequence(ds_clp->cl_session,
1104                                            args,
1105                                            res,
1106                                            task);
1107         return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
1108                                    args,
1109                                    res,
1110                                    task);
1111 }
1112
1113 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1114 {
1115         struct nfs_pgio_header *hdr = data;
1116
1117         if (ff_layout_setup_sequence(hdr->ds_clp,
1118                                      &hdr->args.seq_args,
1119                                      &hdr->res.seq_res,
1120                                      task))
1121                 return;
1122
1123         if (ff_layout_read_prepare_common(task, hdr))
1124                 return;
1125
1126         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1127                         hdr->args.lock_context, FMODE_READ) == -EIO)
1128                 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1129 }
1130
1131 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1132 {
1133         struct nfs_pgio_header *hdr = data;
1134
1135         dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1136
1137         nfs4_ff_layout_stat_io_end_read(task,
1138                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1139                         hdr->args.count, hdr->res.count);
1140
1141         if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1142             task->tk_status == 0) {
1143                 nfs4_sequence_done(task, &hdr->res.seq_res);
1144                 return;
1145         }
1146
1147         /* Note this may cause RPC to be resent */
1148         hdr->mds_ops->rpc_call_done(task, hdr);
1149 }
1150
1151 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1152 {
1153         struct nfs_pgio_header *hdr = data;
1154
1155         rpc_count_iostats_metrics(task,
1156             &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1157 }
1158
1159 static int ff_layout_write_done_cb(struct rpc_task *task,
1160                                 struct nfs_pgio_header *hdr)
1161 {
1162         struct inode *inode;
1163         int err;
1164
1165         trace_nfs4_pnfs_write(hdr, task->tk_status);
1166         if (task->tk_status == -ETIMEDOUT && !hdr->res.op_status)
1167                 hdr->res.op_status = NFS4ERR_NXIO;
1168         if (task->tk_status < 0 && hdr->res.op_status)
1169                 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1170                                             hdr->args.offset, hdr->args.count,
1171                                             hdr->res.op_status, OP_WRITE);
1172         err = ff_layout_async_handle_error(task, hdr->args.context->state,
1173                                            hdr->ds_clp, hdr->lseg,
1174                                            hdr->pgio_mirror_idx);
1175
1176         switch (err) {
1177         case -NFS4ERR_RESET_TO_PNFS:
1178         case -NFS4ERR_RESET_TO_MDS:
1179                 inode = hdr->lseg->pls_layout->plh_inode;
1180                 pnfs_error_mark_layout_for_return(inode, hdr->lseg);
1181                 if (err == -NFS4ERR_RESET_TO_PNFS) {
1182                         pnfs_set_retry_layoutget(hdr->lseg->pls_layout);
1183                         ff_layout_reset_write(hdr, true);
1184                 } else {
1185                         pnfs_clear_retry_layoutget(hdr->lseg->pls_layout);
1186                         ff_layout_reset_write(hdr, false);
1187                 }
1188                 return task->tk_status;
1189         case -EAGAIN:
1190                 rpc_restart_call_prepare(task);
1191                 return -EAGAIN;
1192         }
1193
1194         if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1195             hdr->res.verf->committed == NFS_DATA_SYNC)
1196                 ff_layout_set_layoutcommit(hdr);
1197
1198         if (task->tk_status >= 0)
1199                 nfs_writeback_update_inode(hdr);
1200
1201         return 0;
1202 }
1203
1204 static int ff_layout_commit_done_cb(struct rpc_task *task,
1205                                      struct nfs_commit_data *data)
1206 {
1207         struct inode *inode;
1208         int err;
1209
1210         trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1211         if (task->tk_status == -ETIMEDOUT && !data->res.op_status)
1212                 data->res.op_status = NFS4ERR_NXIO;
1213         if (task->tk_status < 0 && data->res.op_status)
1214                 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1215                                             data->args.offset, data->args.count,
1216                                             data->res.op_status, OP_COMMIT);
1217         err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1218                                            data->lseg, data->ds_commit_index);
1219
1220         switch (err) {
1221         case -NFS4ERR_RESET_TO_PNFS:
1222         case -NFS4ERR_RESET_TO_MDS:
1223                 inode = data->lseg->pls_layout->plh_inode;
1224                 pnfs_error_mark_layout_for_return(inode, data->lseg);
1225                 if (err == -NFS4ERR_RESET_TO_PNFS)
1226                         pnfs_set_retry_layoutget(data->lseg->pls_layout);
1227                 else
1228                         pnfs_clear_retry_layoutget(data->lseg->pls_layout);
1229                 pnfs_generic_prepare_to_resend_writes(data);
1230                 return -EAGAIN;
1231         case -EAGAIN:
1232                 rpc_restart_call_prepare(task);
1233                 return -EAGAIN;
1234         }
1235
1236         if (data->verf.committed == NFS_UNSTABLE
1237             && ff_layout_need_layoutcommit(data->lseg))
1238                 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb);
1239
1240         return 0;
1241 }
1242
1243 static int ff_layout_write_prepare_common(struct rpc_task *task,
1244                                           struct nfs_pgio_header *hdr)
1245 {
1246         nfs4_ff_layout_stat_io_start_write(
1247                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1248                         hdr->args.count,
1249                         task->tk_start);
1250
1251         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1252                 rpc_exit(task, -EIO);
1253                 return -EIO;
1254         }
1255
1256         if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1257                 bool retry_pnfs;
1258
1259                 retry_pnfs = ff_layout_has_available_ds(hdr->lseg);
1260                 dprintk("%s task %u reset io to %s\n", __func__,
1261                         task->tk_pid, retry_pnfs ? "pNFS" : "MDS");
1262                 ff_layout_reset_write(hdr, retry_pnfs);
1263                 rpc_exit(task, 0);
1264                 return -EAGAIN;
1265         }
1266
1267         return 0;
1268 }
1269
1270 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1271 {
1272         struct nfs_pgio_header *hdr = data;
1273
1274         if (ff_layout_write_prepare_common(task, hdr))
1275                 return;
1276
1277         rpc_call_start(task);
1278 }
1279
1280 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1281 {
1282         struct nfs_pgio_header *hdr = data;
1283
1284         if (ff_layout_setup_sequence(hdr->ds_clp,
1285                                      &hdr->args.seq_args,
1286                                      &hdr->res.seq_res,
1287                                      task))
1288                 return;
1289
1290         if (ff_layout_write_prepare_common(task, hdr))
1291                 return;
1292
1293         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1294                         hdr->args.lock_context, FMODE_WRITE) == -EIO)
1295                 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1296 }
1297
1298 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1299 {
1300         struct nfs_pgio_header *hdr = data;
1301
1302         nfs4_ff_layout_stat_io_end_write(task,
1303                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1304                         hdr->args.count, hdr->res.count,
1305                         hdr->res.verf->committed);
1306
1307         if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1308             task->tk_status == 0) {
1309                 nfs4_sequence_done(task, &hdr->res.seq_res);
1310                 return;
1311         }
1312
1313         /* Note this may cause RPC to be resent */
1314         hdr->mds_ops->rpc_call_done(task, hdr);
1315 }
1316
1317 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1318 {
1319         struct nfs_pgio_header *hdr = data;
1320
1321         rpc_count_iostats_metrics(task,
1322             &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1323 }
1324
1325 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1326                 struct nfs_commit_data *cdata)
1327 {
1328         nfs4_ff_layout_stat_io_start_write(
1329                         FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1330                         0, task->tk_start);
1331 }
1332
1333 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1334 {
1335         ff_layout_commit_prepare_common(task, data);
1336         rpc_call_start(task);
1337 }
1338
1339 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1340 {
1341         struct nfs_commit_data *wdata = data;
1342
1343         if (ff_layout_setup_sequence(wdata->ds_clp,
1344                                  &wdata->args.seq_args,
1345                                  &wdata->res.seq_res,
1346                                  task))
1347                 return;
1348         ff_layout_commit_prepare_common(task, data);
1349 }
1350
1351 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1352 {
1353         struct nfs_commit_data *cdata = data;
1354         struct nfs_page *req;
1355         __u64 count = 0;
1356
1357         if (task->tk_status == 0) {
1358                 list_for_each_entry(req, &cdata->pages, wb_list)
1359                         count += req->wb_bytes;
1360         }
1361
1362         nfs4_ff_layout_stat_io_end_write(task,
1363                         FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1364                         count, count, NFS_FILE_SYNC);
1365
1366         pnfs_generic_write_commit_done(task, data);
1367 }
1368
1369 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1370 {
1371         struct nfs_commit_data *cdata = data;
1372
1373         rpc_count_iostats_metrics(task,
1374             &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1375 }
1376
1377 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1378         .rpc_call_prepare = ff_layout_read_prepare_v3,
1379         .rpc_call_done = ff_layout_read_call_done,
1380         .rpc_count_stats = ff_layout_read_count_stats,
1381         .rpc_release = pnfs_generic_rw_release,
1382 };
1383
1384 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1385         .rpc_call_prepare = ff_layout_read_prepare_v4,
1386         .rpc_call_done = ff_layout_read_call_done,
1387         .rpc_count_stats = ff_layout_read_count_stats,
1388         .rpc_release = pnfs_generic_rw_release,
1389 };
1390
1391 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1392         .rpc_call_prepare = ff_layout_write_prepare_v3,
1393         .rpc_call_done = ff_layout_write_call_done,
1394         .rpc_count_stats = ff_layout_write_count_stats,
1395         .rpc_release = pnfs_generic_rw_release,
1396 };
1397
1398 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1399         .rpc_call_prepare = ff_layout_write_prepare_v4,
1400         .rpc_call_done = ff_layout_write_call_done,
1401         .rpc_count_stats = ff_layout_write_count_stats,
1402         .rpc_release = pnfs_generic_rw_release,
1403 };
1404
1405 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1406         .rpc_call_prepare = ff_layout_commit_prepare_v3,
1407         .rpc_call_done = ff_layout_commit_done,
1408         .rpc_count_stats = ff_layout_commit_count_stats,
1409         .rpc_release = pnfs_generic_commit_release,
1410 };
1411
1412 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1413         .rpc_call_prepare = ff_layout_commit_prepare_v4,
1414         .rpc_call_done = ff_layout_commit_done,
1415         .rpc_count_stats = ff_layout_commit_count_stats,
1416         .rpc_release = pnfs_generic_commit_release,
1417 };
1418
1419 static enum pnfs_try_status
1420 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1421 {
1422         struct pnfs_layout_segment *lseg = hdr->lseg;
1423         struct nfs4_pnfs_ds *ds;
1424         struct rpc_clnt *ds_clnt;
1425         struct rpc_cred *ds_cred;
1426         loff_t offset = hdr->args.offset;
1427         u32 idx = hdr->pgio_mirror_idx;
1428         int vers;
1429         struct nfs_fh *fh;
1430
1431         dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1432                 __func__, hdr->inode->i_ino,
1433                 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1434
1435         ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1436         if (!ds)
1437                 goto out_failed;
1438
1439         ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1440                                                    hdr->inode);
1441         if (IS_ERR(ds_clnt))
1442                 goto out_failed;
1443
1444         ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1445         if (IS_ERR(ds_cred))
1446                 goto out_failed;
1447
1448         vers = nfs4_ff_layout_ds_version(lseg, idx);
1449
1450         dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1451                 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1452
1453         atomic_inc(&ds->ds_clp->cl_count);
1454         hdr->ds_clp = ds->ds_clp;
1455         fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1456         if (fh)
1457                 hdr->args.fh = fh;
1458         /*
1459          * Note that if we ever decide to split across DSes,
1460          * then we may need to handle dense-like offsets.
1461          */
1462         hdr->args.offset = offset;
1463         hdr->mds_offset = offset;
1464
1465         /* Perform an asynchronous read to ds */
1466         nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1467                           vers == 3 ? &ff_layout_read_call_ops_v3 :
1468                                       &ff_layout_read_call_ops_v4,
1469                           0, RPC_TASK_SOFTCONN);
1470
1471         return PNFS_ATTEMPTED;
1472
1473 out_failed:
1474         if (ff_layout_has_available_ds(lseg))
1475                 return PNFS_TRY_AGAIN;
1476         return PNFS_NOT_ATTEMPTED;
1477 }
1478
1479 /* Perform async writes. */
1480 static enum pnfs_try_status
1481 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1482 {
1483         struct pnfs_layout_segment *lseg = hdr->lseg;
1484         struct nfs4_pnfs_ds *ds;
1485         struct rpc_clnt *ds_clnt;
1486         struct rpc_cred *ds_cred;
1487         loff_t offset = hdr->args.offset;
1488         int vers;
1489         struct nfs_fh *fh;
1490         int idx = hdr->pgio_mirror_idx;
1491
1492         ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1493         if (!ds)
1494                 return PNFS_NOT_ATTEMPTED;
1495
1496         ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1497                                                    hdr->inode);
1498         if (IS_ERR(ds_clnt))
1499                 return PNFS_NOT_ATTEMPTED;
1500
1501         ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1502         if (IS_ERR(ds_cred))
1503                 return PNFS_NOT_ATTEMPTED;
1504
1505         vers = nfs4_ff_layout_ds_version(lseg, idx);
1506
1507         dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1508                 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1509                 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1510                 vers);
1511
1512         hdr->pgio_done_cb = ff_layout_write_done_cb;
1513         atomic_inc(&ds->ds_clp->cl_count);
1514         hdr->ds_clp = ds->ds_clp;
1515         hdr->ds_commit_idx = idx;
1516         fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1517         if (fh)
1518                 hdr->args.fh = fh;
1519
1520         /*
1521          * Note that if we ever decide to split across DSes,
1522          * then we may need to handle dense-like offsets.
1523          */
1524         hdr->args.offset = offset;
1525
1526         /* Perform an asynchronous write */
1527         nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1528                           vers == 3 ? &ff_layout_write_call_ops_v3 :
1529                                       &ff_layout_write_call_ops_v4,
1530                           sync, RPC_TASK_SOFTCONN);
1531         return PNFS_ATTEMPTED;
1532 }
1533
1534 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1535 {
1536         return i;
1537 }
1538
1539 static struct nfs_fh *
1540 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1541 {
1542         struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1543
1544         /* FIXME: Assume that there is only one NFS version available
1545          * for the DS.
1546          */
1547         return &flseg->mirror_array[i]->fh_versions[0];
1548 }
1549
1550 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1551 {
1552         struct pnfs_layout_segment *lseg = data->lseg;
1553         struct nfs4_pnfs_ds *ds;
1554         struct rpc_clnt *ds_clnt;
1555         struct rpc_cred *ds_cred;
1556         u32 idx;
1557         int vers;
1558         struct nfs_fh *fh;
1559
1560         idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1561         ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1562         if (!ds)
1563                 goto out_err;
1564
1565         ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1566                                                    data->inode);
1567         if (IS_ERR(ds_clnt))
1568                 goto out_err;
1569
1570         ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1571         if (IS_ERR(ds_cred))
1572                 goto out_err;
1573
1574         vers = nfs4_ff_layout_ds_version(lseg, idx);
1575
1576         dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1577                 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1578                 vers);
1579         data->commit_done_cb = ff_layout_commit_done_cb;
1580         data->cred = ds_cred;
1581         atomic_inc(&ds->ds_clp->cl_count);
1582         data->ds_clp = ds->ds_clp;
1583         fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1584         if (fh)
1585                 data->args.fh = fh;
1586
1587         return nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1588                                    vers == 3 ? &ff_layout_commit_call_ops_v3 :
1589                                                &ff_layout_commit_call_ops_v4,
1590                                    how, RPC_TASK_SOFTCONN);
1591 out_err:
1592         pnfs_generic_prepare_to_resend_writes(data);
1593         pnfs_generic_commit_release(data);
1594         return -EAGAIN;
1595 }
1596
1597 static int
1598 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1599                            int how, struct nfs_commit_info *cinfo)
1600 {
1601         return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1602                                             ff_layout_initiate_commit);
1603 }
1604
1605 static struct pnfs_ds_commit_info *
1606 ff_layout_get_ds_info(struct inode *inode)
1607 {
1608         struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1609
1610         if (layout == NULL)
1611                 return NULL;
1612
1613         return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1614 }
1615
1616 static void
1617 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1618 {
1619         nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1620                                                   id_node));
1621 }
1622
1623 static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo,
1624                                   struct xdr_stream *xdr,
1625                                   const struct nfs4_layoutreturn_args *args)
1626 {
1627         struct pnfs_layout_hdr *hdr = &flo->generic_hdr;
1628         __be32 *start;
1629         int count = 0, ret = 0;
1630
1631         start = xdr_reserve_space(xdr, 4);
1632         if (unlikely(!start))
1633                 return -E2BIG;
1634
1635         /* This assume we always return _ALL_ layouts */
1636         spin_lock(&hdr->plh_inode->i_lock);
1637         ret = ff_layout_encode_ds_ioerr(flo, xdr, &count, &args->range);
1638         spin_unlock(&hdr->plh_inode->i_lock);
1639
1640         *start = cpu_to_be32(count);
1641
1642         return ret;
1643 }
1644
1645 /* report nothing for now */
1646 static void ff_layout_encode_iostats(struct nfs4_flexfile_layout *flo,
1647                                      struct xdr_stream *xdr,
1648                                      const struct nfs4_layoutreturn_args *args)
1649 {
1650         __be32 *p;
1651
1652         p = xdr_reserve_space(xdr, 4);
1653         if (likely(p))
1654                 *p = cpu_to_be32(0);
1655 }
1656
1657 static struct nfs4_deviceid_node *
1658 ff_layout_alloc_deviceid_node(struct nfs_server *server,
1659                               struct pnfs_device *pdev, gfp_t gfp_flags)
1660 {
1661         struct nfs4_ff_layout_ds *dsaddr;
1662
1663         dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
1664         if (!dsaddr)
1665                 return NULL;
1666         return &dsaddr->id_node;
1667 }
1668
1669 static void
1670 ff_layout_encode_layoutreturn(struct pnfs_layout_hdr *lo,
1671                               struct xdr_stream *xdr,
1672                               const struct nfs4_layoutreturn_args *args)
1673 {
1674         struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
1675         __be32 *start;
1676
1677         dprintk("%s: Begin\n", __func__);
1678         start = xdr_reserve_space(xdr, 4);
1679         BUG_ON(!start);
1680
1681         if (ff_layout_encode_ioerr(flo, xdr, args))
1682                 goto out;
1683
1684         ff_layout_encode_iostats(flo, xdr, args);
1685 out:
1686         *start = cpu_to_be32((xdr->p - start - 1) * 4);
1687         dprintk("%s: Return\n", __func__);
1688 }
1689
1690 static int
1691 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
1692 {
1693         const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
1694
1695         return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
1696 }
1697
1698 static size_t
1699 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
1700                           const int buflen)
1701 {
1702         const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
1703         const struct in6_addr *addr = &sin6->sin6_addr;
1704
1705         /*
1706          * RFC 4291, Section 2.2.2
1707          *
1708          * Shorthanded ANY address
1709          */
1710         if (ipv6_addr_any(addr))
1711                 return snprintf(buf, buflen, "::");
1712
1713         /*
1714          * RFC 4291, Section 2.2.2
1715          *
1716          * Shorthanded loopback address
1717          */
1718         if (ipv6_addr_loopback(addr))
1719                 return snprintf(buf, buflen, "::1");
1720
1721         /*
1722          * RFC 4291, Section 2.2.3
1723          *
1724          * Special presentation address format for mapped v4
1725          * addresses.
1726          */
1727         if (ipv6_addr_v4mapped(addr))
1728                 return snprintf(buf, buflen, "::ffff:%pI4",
1729                                         &addr->s6_addr32[3]);
1730
1731         /*
1732          * RFC 4291, Section 2.2.1
1733          */
1734         return snprintf(buf, buflen, "%pI6c", addr);
1735 }
1736
1737 /* Derived from rpc_sockaddr2uaddr */
1738 static void
1739 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
1740 {
1741         struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
1742         char portbuf[RPCBIND_MAXUADDRPLEN];
1743         char addrbuf[RPCBIND_MAXUADDRLEN];
1744         char *netid;
1745         unsigned short port;
1746         int len, netid_len;
1747         __be32 *p;
1748
1749         switch (sap->sa_family) {
1750         case AF_INET:
1751                 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
1752                         return;
1753                 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1754                 netid = "tcp";
1755                 netid_len = 3;
1756                 break;
1757         case AF_INET6:
1758                 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
1759                         return;
1760                 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
1761                 netid = "tcp6";
1762                 netid_len = 4;
1763                 break;
1764         default:
1765                 /* we only support tcp and tcp6 */
1766                 WARN_ON_ONCE(1);
1767                 return;
1768         }
1769
1770         snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
1771         len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
1772
1773         p = xdr_reserve_space(xdr, 4 + netid_len);
1774         xdr_encode_opaque(p, netid, netid_len);
1775
1776         p = xdr_reserve_space(xdr, 4 + len);
1777         xdr_encode_opaque(p, addrbuf, len);
1778 }
1779
1780 static void
1781 ff_layout_encode_nfstime(struct xdr_stream *xdr,
1782                          ktime_t t)
1783 {
1784         struct timespec64 ts;
1785         __be32 *p;
1786
1787         p = xdr_reserve_space(xdr, 12);
1788         ts = ktime_to_timespec64(t);
1789         p = xdr_encode_hyper(p, ts.tv_sec);
1790         *p++ = cpu_to_be32(ts.tv_nsec);
1791 }
1792
1793 static void
1794 ff_layout_encode_io_latency(struct xdr_stream *xdr,
1795                             struct nfs4_ff_io_stat *stat)
1796 {
1797         __be32 *p;
1798
1799         p = xdr_reserve_space(xdr, 5 * 8);
1800         p = xdr_encode_hyper(p, stat->ops_requested);
1801         p = xdr_encode_hyper(p, stat->bytes_requested);
1802         p = xdr_encode_hyper(p, stat->ops_completed);
1803         p = xdr_encode_hyper(p, stat->bytes_completed);
1804         p = xdr_encode_hyper(p, stat->bytes_not_delivered);
1805         ff_layout_encode_nfstime(xdr, stat->total_busy_time);
1806         ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
1807 }
1808
1809 static void
1810 ff_layout_encode_layoutstats(struct xdr_stream *xdr,
1811                              struct nfs42_layoutstat_args *args,
1812                              struct nfs42_layoutstat_devinfo *devinfo)
1813 {
1814         struct nfs4_ff_layout_mirror *mirror = devinfo->layout_private;
1815         struct nfs4_pnfs_ds_addr *da;
1816         struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
1817         struct nfs_fh *fh = &mirror->fh_versions[0];
1818         __be32 *p, *start;
1819
1820         da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
1821         dprintk("%s: DS %s: encoding address %s\n",
1822                 __func__, ds->ds_remotestr, da->da_remotestr);
1823         /* layoutupdate length */
1824         start = xdr_reserve_space(xdr, 4);
1825         /* netaddr4 */
1826         ff_layout_encode_netaddr(xdr, da);
1827         /* nfs_fh4 */
1828         p = xdr_reserve_space(xdr, 4 + fh->size);
1829         xdr_encode_opaque(p, fh->data, fh->size);
1830         /* ff_io_latency4 read */
1831         spin_lock(&mirror->lock);
1832         ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
1833         /* ff_io_latency4 write */
1834         ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
1835         spin_unlock(&mirror->lock);
1836         /* nfstime4 */
1837         ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
1838         /* bool */
1839         p = xdr_reserve_space(xdr, 4);
1840         *p = cpu_to_be32(false);
1841
1842         *start = cpu_to_be32((xdr->p - start - 1) * 4);
1843 }
1844
1845 static bool
1846 ff_layout_mirror_prepare_stats(struct nfs42_layoutstat_args *args,
1847                                struct pnfs_layout_segment *pls,
1848                                int *dev_count, int dev_limit)
1849 {
1850         struct nfs4_ff_layout_mirror *mirror;
1851         struct nfs4_deviceid_node *dev;
1852         struct nfs42_layoutstat_devinfo *devinfo;
1853         int i;
1854
1855         for (i = 0; i < FF_LAYOUT_MIRROR_COUNT(pls); i++) {
1856                 if (*dev_count >= dev_limit)
1857                         break;
1858                 mirror = FF_LAYOUT_COMP(pls, i);
1859                 if (!mirror || !mirror->mirror_ds)
1860                         continue;
1861                 dev = FF_LAYOUT_DEVID_NODE(pls, i);
1862                 devinfo = &args->devinfo[*dev_count];
1863                 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
1864                 devinfo->offset = pls->pls_range.offset;
1865                 devinfo->length = pls->pls_range.length;
1866                 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
1867                 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
1868                 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
1869                 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
1870                 devinfo->layout_type = LAYOUT_FLEX_FILES;
1871                 devinfo->layoutstats_encode = ff_layout_encode_layoutstats;
1872                 devinfo->layout_private = mirror;
1873                 /* lseg refcount put in cleanup_layoutstats */
1874                 pnfs_get_lseg(pls);
1875
1876                 ++(*dev_count);
1877         }
1878
1879         return *dev_count < dev_limit;
1880 }
1881
1882 static int
1883 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
1884 {
1885         struct pnfs_layout_segment *pls;
1886         int dev_count = 0;
1887
1888         spin_lock(&args->inode->i_lock);
1889         list_for_each_entry(pls, &NFS_I(args->inode)->layout->plh_segs, pls_list) {
1890                 dev_count += FF_LAYOUT_MIRROR_COUNT(pls);
1891         }
1892         spin_unlock(&args->inode->i_lock);
1893         /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
1894         if (dev_count > PNFS_LAYOUTSTATS_MAXDEV) {
1895                 dprintk("%s: truncating devinfo to limit (%d:%d)\n",
1896                         __func__, dev_count, PNFS_LAYOUTSTATS_MAXDEV);
1897                 dev_count = PNFS_LAYOUTSTATS_MAXDEV;
1898         }
1899         args->devinfo = kmalloc(dev_count * sizeof(*args->devinfo), GFP_KERNEL);
1900         if (!args->devinfo)
1901                 return -ENOMEM;
1902
1903         dev_count = 0;
1904         spin_lock(&args->inode->i_lock);
1905         list_for_each_entry(pls, &NFS_I(args->inode)->layout->plh_segs, pls_list) {
1906                 if (!ff_layout_mirror_prepare_stats(args, pls, &dev_count,
1907                                                     PNFS_LAYOUTSTATS_MAXDEV)) {
1908                         break;
1909                 }
1910         }
1911         spin_unlock(&args->inode->i_lock);
1912         args->num_dev = dev_count;
1913
1914         return 0;
1915 }
1916
1917 static void
1918 ff_layout_cleanup_layoutstats(struct nfs42_layoutstat_data *data)
1919 {
1920         struct nfs4_ff_layout_mirror *mirror;
1921         int i;
1922
1923         for (i = 0; i < data->args.num_dev; i++) {
1924                 mirror = data->args.devinfo[i].layout_private;
1925                 data->args.devinfo[i].layout_private = NULL;
1926                 pnfs_put_lseg(mirror->lseg);
1927         }
1928 }
1929
1930 static struct pnfs_layoutdriver_type flexfilelayout_type = {
1931         .id                     = LAYOUT_FLEX_FILES,
1932         .name                   = "LAYOUT_FLEX_FILES",
1933         .owner                  = THIS_MODULE,
1934         .alloc_layout_hdr       = ff_layout_alloc_layout_hdr,
1935         .free_layout_hdr        = ff_layout_free_layout_hdr,
1936         .alloc_lseg             = ff_layout_alloc_lseg,
1937         .free_lseg              = ff_layout_free_lseg,
1938         .pg_read_ops            = &ff_layout_pg_read_ops,
1939         .pg_write_ops           = &ff_layout_pg_write_ops,
1940         .get_ds_info            = ff_layout_get_ds_info,
1941         .free_deviceid_node     = ff_layout_free_deviceid_node,
1942         .mark_request_commit    = pnfs_layout_mark_request_commit,
1943         .clear_request_commit   = pnfs_generic_clear_request_commit,
1944         .scan_commit_lists      = pnfs_generic_scan_commit_lists,
1945         .recover_commit_reqs    = pnfs_generic_recover_commit_reqs,
1946         .commit_pagelist        = ff_layout_commit_pagelist,
1947         .read_pagelist          = ff_layout_read_pagelist,
1948         .write_pagelist         = ff_layout_write_pagelist,
1949         .alloc_deviceid_node    = ff_layout_alloc_deviceid_node,
1950         .encode_layoutreturn    = ff_layout_encode_layoutreturn,
1951         .sync                   = pnfs_nfs_generic_sync,
1952         .prepare_layoutstats    = ff_layout_prepare_layoutstats,
1953         .cleanup_layoutstats    = ff_layout_cleanup_layoutstats,
1954 };
1955
1956 static int __init nfs4flexfilelayout_init(void)
1957 {
1958         printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
1959                __func__);
1960         return pnfs_register_layoutdriver(&flexfilelayout_type);
1961 }
1962
1963 static void __exit nfs4flexfilelayout_exit(void)
1964 {
1965         printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
1966                __func__);
1967         pnfs_unregister_layoutdriver(&flexfilelayout_type);
1968 }
1969
1970 MODULE_ALIAS("nfs-layouttype4-4");
1971
1972 MODULE_LICENSE("GPL");
1973 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
1974
1975 module_init(nfs4flexfilelayout_init);
1976 module_exit(nfs4flexfilelayout_exit);