fs/nfs/flexfilelayout/flexfilelayout.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Module for pnfs flexfile layout driver.
   4  *
   5  * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
   6  *
   7  * Tao Peng <bergwolf@primarydata.com>
   8  */
   9
  10 #include <linux/nfs_fs.h>
  11 #include <linux/nfs_page.h>
  12 #include <linux/module.h>
  13 #include <linux/sched/mm.h>
  14
  15 #include <linux/sunrpc/metrics.h>
  16
  17 #include "flexfilelayout.h"
  18 #include "../nfs4session.h"
  19 #include "../nfs4idmap.h"
  20 #include "../internal.h"
  21 #include "../delegation.h"
  22 #include "../nfs4trace.h"
  23 #include "../iostat.h"
  24 #include "../nfs.h"
  25 #include "../nfs42.h"
  26
  27 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
  28
  29 #define FF_LAYOUT_POLL_RETRY_MAX     (15*HZ)
  30 #define FF_LAYOUTRETURN_MAXERR 20
  31
  32 static unsigned short io_maxretrans;
  33
  34 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
  35                 struct nfs_pgio_header *hdr);
  36 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
  37                                struct nfs42_layoutstat_devinfo *devinfo,
  38                                int dev_limit);
  39 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
  40                               const struct nfs42_layoutstat_devinfo *devinfo,
  41                               struct nfs4_ff_layout_mirror *mirror);
  42
  43 static struct pnfs_layout_hdr *
  44 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
  45 {
  46         struct nfs4_flexfile_layout *ffl;
  47
  48         ffl = kzalloc(sizeof(*ffl), gfp_flags);
  49         if (ffl) {
  50                 INIT_LIST_HEAD(&ffl->error_list);
  51                 INIT_LIST_HEAD(&ffl->mirrors);
  52                 ffl->last_report_time = ktime_get();
  53                 return &ffl->generic_hdr;
  54         } else
  55                 return NULL;
  56 }
  57
  58 static void
  59 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
  60 {
  61         struct nfs4_ff_layout_ds_err *err, *n;
  62
  63         list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
  64                                  list) {
  65                 list_del(&err->list);
  66                 kfree(err);
  67         }
  68         kfree(FF_LAYOUT_FROM_HDR(lo));
  69 }
  70
  71 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
  72 {
  73         __be32 *p;
  74
  75         p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
  76         if (unlikely(p == NULL))
  77                 return -ENOBUFS;
  78         stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
  79         memcpy(stateid->data, p, NFS4_STATEID_SIZE);
  80         dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
  81                 p[0], p[1], p[2], p[3]);
  82         return 0;
  83 }
  84
  85 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
  86 {
  87         __be32 *p;
  88
  89         p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
  90         if (unlikely(!p))
  91                 return -ENOBUFS;
  92         memcpy(devid, p, NFS4_DEVICEID4_SIZE);
  93         nfs4_print_deviceid(devid);
  94         return 0;
  95 }
  96
  97 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
  98 {
  99         __be32 *p;
 100
 101         p = xdr_inline_decode(xdr, 4);
 102         if (unlikely(!p))
 103                 return -ENOBUFS;
 104         fh->size = be32_to_cpup(p++);
 105         if (fh->size > sizeof(struct nfs_fh)) {
 106                 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
 107                        fh->size);
 108                 return -EOVERFLOW;
 109         }
 110         /* fh.data */
 111         p = xdr_inline_decode(xdr, fh->size);
 112         if (unlikely(!p))
 113                 return -ENOBUFS;
 114         memcpy(&fh->data, p, fh->size);
 115         dprintk("%s: fh len %d\n", __func__, fh->size);
 116
 117         return 0;
 118 }
 119
 120 /*
 121  * Currently only stringified uids and gids are accepted.
 122  * I.e., kerberos is not supported to the DSes, so no pricipals.
 123  *
 124  * That means that one common function will suffice, but when
 125  * principals are added, this should be split to accomodate
 126  * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
 127  */
 128 static int
 129 decode_name(struct xdr_stream *xdr, u32 *id)
 130 {
 131         __be32 *p;
 132         int len;
 133
 134         /* opaque_length(4)*/
 135         p = xdr_inline_decode(xdr, 4);
 136         if (unlikely(!p))
 137                 return -ENOBUFS;
 138         len = be32_to_cpup(p++);
 139         if (len < 0)
 140                 return -EINVAL;
 141
 142         dprintk("%s: len %u\n", __func__, len);
 143
 144         /* opaque body */
 145         p = xdr_inline_decode(xdr, len);
 146         if (unlikely(!p))
 147                 return -ENOBUFS;
 148
 149         if (!nfs_map_string_to_numeric((char *)p, len, id))
 150                 return -EINVAL;
 151
 152         return 0;
 153 }
 154
 155 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
 156                 const struct nfs4_ff_layout_mirror *m2)
 157 {
 158         int i, j;
 159
 160         if (m1->fh_versions_cnt != m2->fh_versions_cnt)
 161                 return false;
 162         for (i = 0; i < m1->fh_versions_cnt; i++) {
 163                 bool found_fh = false;
 164                 for (j = 0; j < m2->fh_versions_cnt; j++) {
 165                         if (nfs_compare_fh(&m1->fh_versions[i],
 166                                         &m2->fh_versions[j]) == 0) {
 167                                 found_fh = true;
 168                                 break;
 169                         }
 170                 }
 171                 if (!found_fh)
 172                         return false;
 173         }
 174         return true;
 175 }
 176
 177 static struct nfs4_ff_layout_mirror *
 178 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
 179                 struct nfs4_ff_layout_mirror *mirror)
 180 {
 181         struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
 182         struct nfs4_ff_layout_mirror *pos;
 183         struct inode *inode = lo->plh_inode;
 184
 185         spin_lock(&inode->i_lock);
 186         list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
 187                 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
 188                         continue;
 189                 if (!ff_mirror_match_fh(mirror, pos))
 190                         continue;
 191                 if (refcount_inc_not_zero(&pos->ref)) {
 192                         spin_unlock(&inode->i_lock);
 193                         return pos;
 194                 }
 195         }
 196         list_add(&mirror->mirrors, &ff_layout->mirrors);
 197         mirror->layout = lo;
 198         spin_unlock(&inode->i_lock);
 199         return mirror;
 200 }
 201
 202 static void
 203 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
 204 {
 205         struct inode *inode;
 206         if (mirror->layout == NULL)
 207                 return;
 208         inode = mirror->layout->plh_inode;
 209         spin_lock(&inode->i_lock);
 210         list_del(&mirror->mirrors);
 211         spin_unlock(&inode->i_lock);
 212         mirror->layout = NULL;
 213 }
 214
 215 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
 216 {
 217         struct nfs4_ff_layout_mirror *mirror;
 218
 219         mirror = kzalloc(sizeof(*mirror), gfp_flags);
 220         if (mirror != NULL) {
 221                 spin_lock_init(&mirror->lock);
 222                 refcount_set(&mirror->ref, 1);
 223                 INIT_LIST_HEAD(&mirror->mirrors);
 224         }
 225         return mirror;
 226 }
 227
 228 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
 229 {
 230         const struct cred       *cred;
 231
 232         ff_layout_remove_mirror(mirror);
 233         kfree(mirror->fh_versions);
 234         cred = rcu_access_pointer(mirror->ro_cred);
 235         put_cred(cred);
 236         cred = rcu_access_pointer(mirror->rw_cred);
 237         put_cred(cred);
 238         nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
 239         kfree(mirror);
 240 }
 241
 242 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
 243 {
 244         if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
 245                 ff_layout_free_mirror(mirror);
 246 }
 247
 248 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
 249 {
 250         int i;
 251
 252         if (fls->mirror_array) {
 253                 for (i = 0; i < fls->mirror_array_cnt; i++) {
 254                         /* normally mirror_ds is freed in
 255                          * .free_deviceid_node but we still do it here
 256                          * for .alloc_lseg error path */
 257                         ff_layout_put_mirror(fls->mirror_array[i]);
 258                 }
 259                 kfree(fls->mirror_array);
 260                 fls->mirror_array = NULL;
 261         }
 262 }
 263
 264 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
 265 {
 266         int ret = 0;
 267
 268         dprintk("--> %s\n", __func__);
 269
 270         /* FIXME: remove this check when layout segment support is added */
 271         if (lgr->range.offset != 0 ||
 272             lgr->range.length != NFS4_MAX_UINT64) {
 273                 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
 274                         __func__);
 275                 ret = -EINVAL;
 276         }
 277
 278         dprintk("--> %s returns %d\n", __func__, ret);
 279         return ret;
 280 }
 281
 282 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
 283 {
 284         if (fls) {
 285                 ff_layout_free_mirror_array(fls);
 286                 kfree(fls);
 287         }
 288 }
 289
 290 static bool
 291 ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
 292                 const struct pnfs_layout_range *l2)
 293 {
 294         u64 end1, end2;
 295
 296         if (l1->iomode != l2->iomode)
 297                 return l1->iomode != IOMODE_READ;
 298         end1 = pnfs_calc_offset_end(l1->offset, l1->length);
 299         end2 = pnfs_calc_offset_end(l2->offset, l2->length);
 300         if (end1 < l2->offset)
 301                 return false;
 302         if (end2 < l1->offset)
 303                 return true;
 304         return l2->offset <= l1->offset;
 305 }
 306
 307 static bool
 308 ff_lseg_merge(struct pnfs_layout_segment *new,
 309                 struct pnfs_layout_segment *old)
 310 {
 311         u64 new_end, old_end;
 312
 313         if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
 314                 return false;
 315         if (new->pls_range.iomode != old->pls_range.iomode)
 316                 return false;
 317         old_end = pnfs_calc_offset_end(old->pls_range.offset,
 318                         old->pls_range.length);
 319         if (old_end < new->pls_range.offset)
 320                 return false;
 321         new_end = pnfs_calc_offset_end(new->pls_range.offset,
 322                         new->pls_range.length);
 323         if (new_end < old->pls_range.offset)
 324                 return false;
 325
 326         /* Mergeable: copy info from 'old' to 'new' */
 327         if (new_end < old_end)
 328                 new_end = old_end;
 329         if (new->pls_range.offset < old->pls_range.offset)
 330                 new->pls_range.offset = old->pls_range.offset;
 331         new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
 332                         new_end);
 333         if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
 334                 set_bit(NFS_LSEG_ROC, &new->pls_flags);
 335         return true;
 336 }
 337
 338 static void
 339 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
 340                 struct pnfs_layout_segment *lseg,
 341                 struct list_head *free_me)
 342 {
 343         pnfs_generic_layout_insert_lseg(lo, lseg,
 344                         ff_lseg_range_is_after,
 345                         ff_lseg_merge,
 346                         free_me);
 347 }
 348
 349 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
 350 {
 351         int i, j;
 352
 353         for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
 354                 for (j = i + 1; j < fls->mirror_array_cnt; j++)
 355                         if (fls->mirror_array[i]->efficiency <
 356                             fls->mirror_array[j]->efficiency)
 357                                 swap(fls->mirror_array[i],
 358                                      fls->mirror_array[j]);
 359         }
 360 }
 361
 362 static struct pnfs_layout_segment *
 363 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
 364                      struct nfs4_layoutget_res *lgr,
 365                      gfp_t gfp_flags)
 366 {
 367         struct pnfs_layout_segment *ret;
 368         struct nfs4_ff_layout_segment *fls = NULL;
 369         struct xdr_stream stream;
 370         struct xdr_buf buf;
 371         struct page *scratch;
 372         u64 stripe_unit;
 373         u32 mirror_array_cnt;
 374         __be32 *p;
 375         int i, rc;
 376
 377         dprintk("--> %s\n", __func__);
 378         scratch = alloc_page(gfp_flags);
 379         if (!scratch)
 380                 return ERR_PTR(-ENOMEM);
 381
 382         xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
 383                               lgr->layoutp->len);
 384         xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
 385
 386         /* stripe unit and mirror_array_cnt */
 387         rc = -EIO;
 388         p = xdr_inline_decode(&stream, 8 + 4);
 389         if (!p)
 390                 goto out_err_free;
 391
 392         p = xdr_decode_hyper(p, &stripe_unit);
 393         mirror_array_cnt = be32_to_cpup(p++);
 394         dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
 395                 stripe_unit, mirror_array_cnt);
 396
 397         if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
 398             mirror_array_cnt == 0)
 399                 goto out_err_free;
 400
 401         rc = -ENOMEM;
 402         fls = kzalloc(sizeof(*fls), gfp_flags);
 403         if (!fls)
 404                 goto out_err_free;
 405
 406         fls->mirror_array_cnt = mirror_array_cnt;
 407         fls->stripe_unit = stripe_unit;
 408         fls->mirror_array = kcalloc(fls->mirror_array_cnt,
 409                                     sizeof(fls->mirror_array[0]), gfp_flags);
 410         if (fls->mirror_array == NULL)
 411                 goto out_err_free;
 412
 413         for (i = 0; i < fls->mirror_array_cnt; i++) {
 414                 struct nfs4_ff_layout_mirror *mirror;
 415                 struct cred *kcred;
 416                 const struct cred __rcu *cred;
 417                 kuid_t uid;
 418                 kgid_t gid;
 419                 u32 ds_count, fh_count, id;
 420                 int j;
 421
 422                 rc = -EIO;
 423                 p = xdr_inline_decode(&stream, 4);
 424                 if (!p)
 425                         goto out_err_free;
 426                 ds_count = be32_to_cpup(p);
 427
 428                 /* FIXME: allow for striping? */
 429                 if (ds_count != 1)
 430                         goto out_err_free;
 431
 432                 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
 433                 if (fls->mirror_array[i] == NULL) {
 434                         rc = -ENOMEM;
 435                         goto out_err_free;
 436                 }
 437
 438                 fls->mirror_array[i]->ds_count = ds_count;
 439
 440                 /* deviceid */
 441                 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
 442                 if (rc)
 443                         goto out_err_free;
 444
 445                 /* efficiency */
 446                 rc = -EIO;
 447                 p = xdr_inline_decode(&stream, 4);
 448                 if (!p)
 449                         goto out_err_free;
 450                 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
 451
 452                 /* stateid */
 453                 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
 454                 if (rc)
 455                         goto out_err_free;
 456
 457                 /* fh */
 458                 rc = -EIO;
 459                 p = xdr_inline_decode(&stream, 4);
 460                 if (!p)
 461                         goto out_err_free;
 462                 fh_count = be32_to_cpup(p);
 463
 464                 fls->mirror_array[i]->fh_versions =
 465                         kcalloc(fh_count, sizeof(struct nfs_fh),
 466                                 gfp_flags);
 467                 if (fls->mirror_array[i]->fh_versions == NULL) {
 468                         rc = -ENOMEM;
 469                         goto out_err_free;
 470                 }
 471
 472                 for (j = 0; j < fh_count; j++) {
 473                         rc = decode_nfs_fh(&stream,
 474                                            &fls->mirror_array[i]->fh_versions[j]);
 475                         if (rc)
 476                                 goto out_err_free;
 477                 }
 478
 479                 fls->mirror_array[i]->fh_versions_cnt = fh_count;
 480
 481                 /* user */
 482                 rc = decode_name(&stream, &id);
 483                 if (rc)
 484                         goto out_err_free;
 485
 486                 uid = make_kuid(&init_user_ns, id);
 487
 488                 /* group */
 489                 rc = decode_name(&stream, &id);
 490                 if (rc)
 491                         goto out_err_free;
 492
 493                 gid = make_kgid(&init_user_ns, id);
 494
 495                 if (gfp_flags & __GFP_FS)
 496                         kcred = prepare_kernel_cred(NULL);
 497                 else {
 498                         unsigned int nofs_flags = memalloc_nofs_save();
 499                         kcred = prepare_kernel_cred(NULL);
 500                         memalloc_nofs_restore(nofs_flags);
 501                 }
 502                 rc = -ENOMEM;
 503                 if (!kcred)
 504                         goto out_err_free;
 505                 kcred->fsuid = uid;
 506                 kcred->fsgid = gid;
 507                 cred = RCU_INITIALIZER(kcred);
 508
 509                 if (lgr->range.iomode == IOMODE_READ)
 510                         rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
 511                 else
 512                         rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
 513
 514                 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
 515                 if (mirror != fls->mirror_array[i]) {
 516                         /* swap cred ptrs so free_mirror will clean up old */
 517                         if (lgr->range.iomode == IOMODE_READ) {
 518                                 cred = xchg(&mirror->ro_cred, cred);
 519                                 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
 520                         } else {
 521                                 cred = xchg(&mirror->rw_cred, cred);
 522                                 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
 523                         }
 524                         ff_layout_free_mirror(fls->mirror_array[i]);
 525                         fls->mirror_array[i] = mirror;
 526                 }
 527
 528                 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
 529                         lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
 530                         from_kuid(&init_user_ns, uid),
 531                         from_kgid(&init_user_ns, gid));
 532         }
 533
 534         p = xdr_inline_decode(&stream, 4);
 535         if (!p)
 536                 goto out_sort_mirrors;
 537         fls->flags = be32_to_cpup(p);
 538
 539         p = xdr_inline_decode(&stream, 4);
 540         if (!p)
 541                 goto out_sort_mirrors;
 542         for (i=0; i < fls->mirror_array_cnt; i++)
 543                 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
 544
 545 out_sort_mirrors:
 546         ff_layout_sort_mirrors(fls);
 547         rc = ff_layout_check_layout(lgr);
 548         if (rc)
 549                 goto out_err_free;
 550         ret = &fls->generic_hdr;
 551         dprintk("<-- %s (success)\n", __func__);
 552 out_free_page:
 553         __free_page(scratch);
 554         return ret;
 555 out_err_free:
 556         _ff_layout_free_lseg(fls);
 557         ret = ERR_PTR(rc);
 558         dprintk("<-- %s (%d)\n", __func__, rc);
 559         goto out_free_page;
 560 }
 561
 562 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
 563 {
 564         struct pnfs_layout_segment *lseg;
 565
 566         list_for_each_entry(lseg, &layout->plh_segs, pls_list)
 567                 if (lseg->pls_range.iomode == IOMODE_RW)
 568                         return true;
 569
 570         return false;
 571 }
 572
 573 static void
 574 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
 575 {
 576         struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
 577
 578         dprintk("--> %s\n", __func__);
 579
 580         if (lseg->pls_range.iomode == IOMODE_RW) {
 581                 struct nfs4_flexfile_layout *ffl;
 582                 struct inode *inode;
 583
 584                 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
 585                 inode = ffl->generic_hdr.plh_inode;
 586                 spin_lock(&inode->i_lock);
 587                 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
 588                         ffl->commit_info.nbuckets = 0;
 589                         kfree(ffl->commit_info.buckets);
 590                         ffl->commit_info.buckets = NULL;
 591                 }
 592                 spin_unlock(&inode->i_lock);
 593         }
 594         _ff_layout_free_lseg(fls);
 595 }
 596
 597 /* Return 1 until we have multiple lsegs support */
 598 static int
 599 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
 600 {
 601         return 1;
 602 }
 603
 604 static void
 605 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
 606 {
 607         /* first IO request? */
 608         if (atomic_inc_return(&timer->n_ops) == 1) {
 609                 timer->start_time = now;
 610         }
 611 }
 612
 613 static ktime_t
 614 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
 615 {
 616         ktime_t start;
 617
 618         if (atomic_dec_return(&timer->n_ops) < 0)
 619                 WARN_ON_ONCE(1);
 620
 621         start = timer->start_time;
 622         timer->start_time = now;
 623         return ktime_sub(now, start);
 624 }
 625
 626 static bool
 627 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
 628                             struct nfs4_ff_layoutstat *layoutstat,
 629                             ktime_t now)
 630 {
 631         s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
 632         struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
 633
 634         nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
 635         if (!mirror->start_time)
 636                 mirror->start_time = now;
 637         if (mirror->report_interval != 0)
 638                 report_interval = (s64)mirror->report_interval * 1000LL;
 639         else if (layoutstats_timer != 0)
 640                 report_interval = (s64)layoutstats_timer * 1000LL;
 641         if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
 642                         report_interval) {
 643                 ffl->last_report_time = now;
 644                 return true;
 645         }
 646
 647         return false;
 648 }
 649
 650 static void
 651 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
 652                 __u64 requested)
 653 {
 654         struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
 655
 656         iostat->ops_requested++;
 657         iostat->bytes_requested += requested;
 658 }
 659
 660 static void
 661 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
 662                 __u64 requested,
 663                 __u64 completed,
 664                 ktime_t time_completed,
 665                 ktime_t time_started)
 666 {
 667         struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
 668         ktime_t completion_time = ktime_sub(time_completed, time_started);
 669         ktime_t timer;
 670
 671         iostat->ops_completed++;
 672         iostat->bytes_completed += completed;
 673         iostat->bytes_not_delivered += requested - completed;
 674
 675         timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
 676         iostat->total_busy_time =
 677                         ktime_add(iostat->total_busy_time, timer);
 678         iostat->aggregate_completion_time =
 679                         ktime_add(iostat->aggregate_completion_time,
 680                                         completion_time);
 681 }
 682
 683 static void
 684 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
 685                 struct nfs4_ff_layout_mirror *mirror,
 686                 __u64 requested, ktime_t now)
 687 {
 688         bool report;
 689
 690         spin_lock(&mirror->lock);
 691         report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
 692         nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
 693         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 694         spin_unlock(&mirror->lock);
 695
 696         if (report)
 697                 pnfs_report_layoutstat(inode, GFP_KERNEL);
 698 }
 699
 700 static void
 701 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
 702                 struct nfs4_ff_layout_mirror *mirror,
 703                 __u64 requested,
 704                 __u64 completed)
 705 {
 706         spin_lock(&mirror->lock);
 707         nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
 708                         requested, completed,
 709                         ktime_get(), task->tk_start);
 710         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 711         spin_unlock(&mirror->lock);
 712 }
 713
 714 static void
 715 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
 716                 struct nfs4_ff_layout_mirror *mirror,
 717                 __u64 requested, ktime_t now)
 718 {
 719         bool report;
 720
 721         spin_lock(&mirror->lock);
 722         report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
 723         nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
 724         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 725         spin_unlock(&mirror->lock);
 726
 727         if (report)
 728                 pnfs_report_layoutstat(inode, GFP_NOIO);
 729 }
 730
 731 static void
 732 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
 733                 struct nfs4_ff_layout_mirror *mirror,
 734                 __u64 requested,
 735                 __u64 completed,
 736                 enum nfs3_stable_how committed)
 737 {
 738         if (committed == NFS_UNSTABLE)
 739                 requested = completed = 0;
 740
 741         spin_lock(&mirror->lock);
 742         nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
 743                         requested, completed, ktime_get(), task->tk_start);
 744         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 745         spin_unlock(&mirror->lock);
 746 }
 747
 748 static int
 749 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
 750                             struct nfs_commit_info *cinfo,
 751                             gfp_t gfp_flags)
 752 {
 753         struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
 754         struct pnfs_commit_bucket *buckets;
 755         int size;
 756
 757         if (cinfo->ds->nbuckets != 0) {
 758                 /* This assumes there is only one RW lseg per file.
 759                  * To support multiple lseg per file, we need to
 760                  * change struct pnfs_commit_bucket to allow dynamic
 761                  * increasing nbuckets.
 762                  */
 763                 return 0;
 764         }
 765
 766         size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
 767
 768         buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
 769                           gfp_flags);
 770         if (!buckets)
 771                 return -ENOMEM;
 772         else {
 773                 int i;
 774
 775                 spin_lock(&cinfo->inode->i_lock);
 776                 if (cinfo->ds->nbuckets != 0)
 777                         kfree(buckets);
 778                 else {
 779                         cinfo->ds->buckets = buckets;
 780                         cinfo->ds->nbuckets = size;
 781                         for (i = 0; i < size; i++) {
 782                                 INIT_LIST_HEAD(&buckets[i].written);
 783                                 INIT_LIST_HEAD(&buckets[i].committing);
 784                                 /* mark direct verifier as unset */
 785                                 buckets[i].direct_verf.committed =
 786                                         NFS_INVALID_STABLE_HOW;
 787                         }
 788                 }
 789                 spin_unlock(&cinfo->inode->i_lock);
 790                 return 0;
 791         }
 792 }
 793
 794 static void
 795 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, int idx)
 796 {
 797         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
 798
 799         if (devid)
 800                 nfs4_mark_deviceid_unavailable(devid);
 801 }
 802
 803 static void
 804 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, int idx)
 805 {
 806         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
 807
 808         if (devid)
 809                 nfs4_mark_deviceid_available(devid);
 810 }
 811
 812 static struct nfs4_pnfs_ds *
 813 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
 814                              int start_idx, int *best_idx,
 815                              bool check_device)
 816 {
 817         struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
 818         struct nfs4_ff_layout_mirror *mirror;
 819         struct nfs4_pnfs_ds *ds;
 820         bool fail_return = false;
 821         int idx;
 822
 823         /* mirrors are initially sorted by efficiency */
 824         for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
 825                 if (idx+1 == fls->mirror_array_cnt)
 826                         fail_return = !check_device;
 827
 828                 mirror = FF_LAYOUT_COMP(lseg, idx);
 829                 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return);
 830                 if (!ds)
 831                         continue;
 832
 833                 if (check_device &&
 834                     nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
 835                         continue;
 836
 837                 *best_idx = idx;
 838                 return ds;
 839         }
 840
 841         return NULL;
 842 }
 843
 844 static struct nfs4_pnfs_ds *
 845 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
 846                                  int start_idx, int *best_idx)
 847 {
 848         return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
 849 }
 850
 851 static struct nfs4_pnfs_ds *
 852 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
 853                                    int start_idx, int *best_idx)
 854 {
 855         return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
 856 }
 857
 858 static struct nfs4_pnfs_ds *
 859 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
 860                                   int start_idx, int *best_idx)
 861 {
 862         struct nfs4_pnfs_ds *ds;
 863
 864         ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
 865         if (ds)
 866                 return ds;
 867         return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
 868 }
 869
 870 static void
 871 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
 872                       struct nfs_page *req,
 873                       bool strict_iomode)
 874 {
 875         pnfs_put_lseg(pgio->pg_lseg);
 876         pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 877                                            nfs_req_openctx(req),
 878                                            0,
 879                                            NFS4_MAX_UINT64,
 880                                            IOMODE_READ,
 881                                            strict_iomode,
 882                                            GFP_KERNEL);
 883         if (IS_ERR(pgio->pg_lseg)) {
 884                 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
 885                 pgio->pg_lseg = NULL;
 886         }
 887 }
 888
 889 static void
 890 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
 891                         struct nfs_page *req)
 892 {
 893         struct nfs_pgio_mirror *pgm;
 894         struct nfs4_ff_layout_mirror *mirror;
 895         struct nfs4_pnfs_ds *ds;
 896         int ds_idx;
 897
 898 retry:
 899         pnfs_generic_pg_check_layout(pgio);
 900         /* Use full layout for now */
 901         if (!pgio->pg_lseg) {
 902                 ff_layout_pg_get_read(pgio, req, false);
 903                 if (!pgio->pg_lseg)
 904                         goto out_nolseg;
 905         }
 906         if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
 907                 ff_layout_pg_get_read(pgio, req, true);
 908                 if (!pgio->pg_lseg)
 909                         goto out_nolseg;
 910         }
 911
 912         ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
 913         if (!ds) {
 914                 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
 915                         goto out_mds;
 916                 pnfs_put_lseg(pgio->pg_lseg);
 917                 pgio->pg_lseg = NULL;
 918                 /* Sleep for 1 second before retrying */
 919                 ssleep(1);
 920                 goto retry;
 921         }
 922
 923         mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
 924
 925         pgio->pg_mirror_idx = ds_idx;
 926
 927         /* read always uses only one mirror - idx 0 for pgio layer */
 928         pgm = &pgio->pg_mirrors[0];
 929         pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
 930
 931         pgio->pg_maxretrans = io_maxretrans;
 932         return;
 933 out_nolseg:
 934         if (pgio->pg_error < 0)
 935                 return;
 936 out_mds:
 937         pnfs_put_lseg(pgio->pg_lseg);
 938         pgio->pg_lseg = NULL;
 939         nfs_pageio_reset_read_mds(pgio);
 940 }
 941
 942 static void
 943 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
 944                         struct nfs_page *req)
 945 {
 946         struct nfs4_ff_layout_mirror *mirror;
 947         struct nfs_pgio_mirror *pgm;
 948         struct nfs_commit_info cinfo;
 949         struct nfs4_pnfs_ds *ds;
 950         int i;
 951         int status;
 952
 953 retry:
 954         pnfs_generic_pg_check_layout(pgio);
 955         if (!pgio->pg_lseg) {
 956                 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 957                                                    nfs_req_openctx(req),
 958                                                    0,
 959                                                    NFS4_MAX_UINT64,
 960                                                    IOMODE_RW,
 961                                                    false,
 962                                                    GFP_NOFS);
 963                 if (IS_ERR(pgio->pg_lseg)) {
 964                         pgio->pg_error = PTR_ERR(pgio->pg_lseg);
 965                         pgio->pg_lseg = NULL;
 966                         return;
 967                 }
 968         }
 969         /* If no lseg, fall back to write through mds */
 970         if (pgio->pg_lseg == NULL)
 971                 goto out_mds;
 972
 973         nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
 974         status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
 975         if (status < 0)
 976                 goto out_mds;
 977
 978         /* Use a direct mapping of ds_idx to pgio mirror_idx */
 979         if (WARN_ON_ONCE(pgio->pg_mirror_count !=
 980             FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
 981                 goto out_mds;
 982
 983         for (i = 0; i < pgio->pg_mirror_count; i++) {
 984                 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
 985                 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
 986                 if (!ds) {
 987                         if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
 988                                 goto out_mds;
 989                         pnfs_put_lseg(pgio->pg_lseg);
 990                         pgio->pg_lseg = NULL;
 991                         /* Sleep for 1 second before retrying */
 992                         ssleep(1);
 993                         goto retry;
 994                 }
 995                 pgm = &pgio->pg_mirrors[i];
 996                 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
 997         }
 998
 999         pgio->pg_maxretrans = io_maxretrans;
1000         return;
1001
1002 out_mds:
1003         pnfs_put_lseg(pgio->pg_lseg);
1004         pgio->pg_lseg = NULL;
1005         nfs_pageio_reset_write_mds(pgio);
1006 }
1007
1008 static unsigned int
1009 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
1010                                     struct nfs_page *req)
1011 {
1012         if (!pgio->pg_lseg) {
1013                 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1014                                                    nfs_req_openctx(req),
1015                                                    0,
1016                                                    NFS4_MAX_UINT64,
1017                                                    IOMODE_RW,
1018                                                    false,
1019                                                    GFP_NOFS);
1020                 if (IS_ERR(pgio->pg_lseg)) {
1021                         pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1022                         pgio->pg_lseg = NULL;
1023                         goto out;
1024                 }
1025         }
1026         if (pgio->pg_lseg)
1027                 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
1028
1029         /* no lseg means that pnfs is not in use, so no mirroring here */
1030         nfs_pageio_reset_write_mds(pgio);
1031 out:
1032         return 1;
1033 }
1034
1035 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
1036         .pg_init = ff_layout_pg_init_read,
1037         .pg_test = pnfs_generic_pg_test,
1038         .pg_doio = pnfs_generic_pg_readpages,
1039         .pg_cleanup = pnfs_generic_pg_cleanup,
1040 };
1041
1042 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1043         .pg_init = ff_layout_pg_init_write,
1044         .pg_test = pnfs_generic_pg_test,
1045         .pg_doio = pnfs_generic_pg_writepages,
1046         .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1047         .pg_cleanup = pnfs_generic_pg_cleanup,
1048 };
1049
1050 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1051 {
1052         struct rpc_task *task = &hdr->task;
1053
1054         pnfs_layoutcommit_inode(hdr->inode, false);
1055
1056         if (retry_pnfs) {
1057                 dprintk("%s Reset task %5u for i/o through pNFS "
1058                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1059                         hdr->task.tk_pid,
1060                         hdr->inode->i_sb->s_id,
1061                         (unsigned long long)NFS_FILEID(hdr->inode),
1062                         hdr->args.count,
1063                         (unsigned long long)hdr->args.offset);
1064
1065                 hdr->completion_ops->reschedule_io(hdr);
1066                 return;
1067         }
1068
1069         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1070                 dprintk("%s Reset task %5u for i/o through MDS "
1071                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1072                         hdr->task.tk_pid,
1073                         hdr->inode->i_sb->s_id,
1074                         (unsigned long long)NFS_FILEID(hdr->inode),
1075                         hdr->args.count,
1076                         (unsigned long long)hdr->args.offset);
1077
1078                 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1079         }
1080 }
1081
1082 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1083 {
1084         struct rpc_task *task = &hdr->task;
1085
1086         pnfs_layoutcommit_inode(hdr->inode, false);
1087
1088         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1089                 dprintk("%s Reset task %5u for i/o through MDS "
1090                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1091                         hdr->task.tk_pid,
1092                         hdr->inode->i_sb->s_id,
1093                         (unsigned long long)NFS_FILEID(hdr->inode),
1094                         hdr->args.count,
1095                         (unsigned long long)hdr->args.offset);
1096
1097                 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1098         }
1099 }
1100
1101 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1102                                            struct nfs4_state *state,
1103                                            struct nfs_client *clp,
1104                                            struct pnfs_layout_segment *lseg,
1105                                            int idx)
1106 {
1107         struct pnfs_layout_hdr *lo = lseg->pls_layout;
1108         struct inode *inode = lo->plh_inode;
1109         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1110         struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1111
1112         switch (task->tk_status) {
1113         case -NFS4ERR_BADSESSION:
1114         case -NFS4ERR_BADSLOT:
1115         case -NFS4ERR_BAD_HIGH_SLOT:
1116         case -NFS4ERR_DEADSESSION:
1117         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1118         case -NFS4ERR_SEQ_FALSE_RETRY:
1119         case -NFS4ERR_SEQ_MISORDERED:
1120                 dprintk("%s ERROR %d, Reset session. Exchangeid "
1121                         "flags 0x%x\n", __func__, task->tk_status,
1122                         clp->cl_exchange_flags);
1123                 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1124                 break;
1125         case -NFS4ERR_DELAY:
1126         case -NFS4ERR_GRACE:
1127                 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1128                 break;
1129         case -NFS4ERR_RETRY_UNCACHED_REP:
1130                 break;
1131         case -EAGAIN:
1132                 return -NFS4ERR_RESET_TO_PNFS;
1133         /* Invalidate Layout errors */
1134         case -NFS4ERR_PNFS_NO_LAYOUT:
1135         case -ESTALE:           /* mapped NFS4ERR_STALE */
1136         case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
1137         case -EISDIR:           /* mapped NFS4ERR_ISDIR */
1138         case -NFS4ERR_FHEXPIRED:
1139         case -NFS4ERR_WRONG_TYPE:
1140                 dprintk("%s Invalid layout error %d\n", __func__,
1141                         task->tk_status);
1142                 /*
1143                  * Destroy layout so new i/o will get a new layout.
1144                  * Layout will not be destroyed until all current lseg
1145                  * references are put. Mark layout as invalid to resend failed
1146                  * i/o and all i/o waiting on the slot table to the MDS until
1147                  * layout is destroyed and a new valid layout is obtained.
1148                  */
1149                 pnfs_destroy_layout(NFS_I(inode));
1150                 rpc_wake_up(&tbl->slot_tbl_waitq);
1151                 goto reset;
1152         /* RPC connection errors */
1153         case -ECONNREFUSED:
1154         case -EHOSTDOWN:
1155         case -EHOSTUNREACH:
1156         case -ENETUNREACH:
1157         case -EIO:
1158         case -ETIMEDOUT:
1159         case -EPIPE:
1160                 dprintk("%s DS connection error %d\n", __func__,
1161                         task->tk_status);
1162                 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1163                                 &devid->deviceid);
1164                 rpc_wake_up(&tbl->slot_tbl_waitq);
1165                 /* fall through */
1166         default:
1167                 if (ff_layout_avoid_mds_available_ds(lseg))
1168                         return -NFS4ERR_RESET_TO_PNFS;
1169 reset:
1170                 dprintk("%s Retry through MDS. Error %d\n", __func__,
1171                         task->tk_status);
1172                 return -NFS4ERR_RESET_TO_MDS;
1173         }
1174         task->tk_status = 0;
1175         return -EAGAIN;
1176 }
1177
1178 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1179 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1180                                            struct pnfs_layout_segment *lseg,
1181                                            int idx)
1182 {
1183         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1184
1185         switch (task->tk_status) {
1186         /* File access problems. Don't mark the device as unavailable */
1187         case -EACCES:
1188         case -ESTALE:
1189         case -EISDIR:
1190         case -EBADHANDLE:
1191         case -ELOOP:
1192         case -ENOSPC:
1193         case -EAGAIN:
1194                 break;
1195         case -EJUKEBOX:
1196                 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1197                 goto out_retry;
1198         default:
1199                 dprintk("%s DS connection error %d\n", __func__,
1200                         task->tk_status);
1201                 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1202                                 &devid->deviceid);
1203         }
1204         /* FIXME: Need to prevent infinite looping here. */
1205         return -NFS4ERR_RESET_TO_PNFS;
1206 out_retry:
1207         task->tk_status = 0;
1208         rpc_restart_call_prepare(task);
1209         rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1210         return -EAGAIN;
1211 }
1212
1213 static int ff_layout_async_handle_error(struct rpc_task *task,
1214                                         struct nfs4_state *state,
1215                                         struct nfs_client *clp,
1216                                         struct pnfs_layout_segment *lseg,
1217                                         int idx)
1218 {
1219         int vers = clp->cl_nfs_mod->rpc_vers->number;
1220
1221         if (task->tk_status >= 0) {
1222                 ff_layout_mark_ds_reachable(lseg, idx);
1223                 return 0;
1224         }
1225
1226         /* Handle the case of an invalid layout segment */
1227         if (!pnfs_is_valid_lseg(lseg))
1228                 return -NFS4ERR_RESET_TO_PNFS;
1229
1230         switch (vers) {
1231         case 3:
1232                 return ff_layout_async_handle_error_v3(task, lseg, idx);
1233         case 4:
1234                 return ff_layout_async_handle_error_v4(task, state, clp,
1235                                                        lseg, idx);
1236         default:
1237                 /* should never happen */
1238                 WARN_ON_ONCE(1);
1239                 return 0;
1240         }
1241 }
1242
1243 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1244                                         int idx, u64 offset, u64 length,
1245                                         u32 status, int opnum, int error)
1246 {
1247         struct nfs4_ff_layout_mirror *mirror;
1248         int err;
1249
1250         if (status == 0) {
1251                 switch (error) {
1252                 case -ETIMEDOUT:
1253                 case -EPFNOSUPPORT:
1254                 case -EPROTONOSUPPORT:
1255                 case -EOPNOTSUPP:
1256                 case -ECONNREFUSED:
1257                 case -ECONNRESET:
1258                 case -EHOSTDOWN:
1259                 case -EHOSTUNREACH:
1260                 case -ENETUNREACH:
1261                 case -EADDRINUSE:
1262                 case -ENOBUFS:
1263                 case -EPIPE:
1264                 case -EPERM:
1265                         status = NFS4ERR_NXIO;
1266                         break;
1267                 case -EACCES:
1268                         status = NFS4ERR_ACCESS;
1269                         break;
1270                 default:
1271                         return;
1272                 }
1273         }
1274
1275         switch (status) {
1276         case NFS4ERR_DELAY:
1277         case NFS4ERR_GRACE:
1278                 return;
1279         default:
1280                 break;
1281         }
1282
1283         mirror = FF_LAYOUT_COMP(lseg, idx);
1284         err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1285                                        mirror, offset, length, status, opnum,
1286                                        GFP_NOIO);
1287         if (status == NFS4ERR_NXIO)
1288                 ff_layout_mark_ds_unreachable(lseg, idx);
1289         pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
1290         dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1291 }
1292
1293 /* NFS_PROTO call done callback routines */
1294 static int ff_layout_read_done_cb(struct rpc_task *task,
1295                                 struct nfs_pgio_header *hdr)
1296 {
1297         int new_idx = hdr->pgio_mirror_idx;
1298         int err;
1299
1300         trace_nfs4_pnfs_read(hdr, task->tk_status);
1301         if (task->tk_status < 0)
1302                 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1303                                             hdr->args.offset, hdr->args.count,
1304                                             hdr->res.op_status, OP_READ,
1305                                             task->tk_status);
1306         err = ff_layout_async_handle_error(task, hdr->args.context->state,
1307                                            hdr->ds_clp, hdr->lseg,
1308                                            hdr->pgio_mirror_idx);
1309
1310         clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1311         clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1312         switch (err) {
1313         case -NFS4ERR_RESET_TO_PNFS:
1314                 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1315                                         hdr->pgio_mirror_idx + 1,
1316                                         &new_idx))
1317                         goto out_layouterror;
1318                 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1319                 return task->tk_status;
1320         case -NFS4ERR_RESET_TO_MDS:
1321                 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1322                 return task->tk_status;
1323         case -EAGAIN:
1324                 goto out_eagain;
1325         }
1326
1327         return 0;
1328 out_layouterror:
1329         ff_layout_read_record_layoutstats_done(task, hdr);
1330         ff_layout_send_layouterror(hdr->lseg);
1331         hdr->pgio_mirror_idx = new_idx;
1332 out_eagain:
1333         rpc_restart_call_prepare(task);
1334         return -EAGAIN;
1335 }
1336
1337 static bool
1338 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1339 {
1340         return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1341 }
1342
1343 /*
1344  * We reference the rpc_cred of the first WRITE that triggers the need for
1345  * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1346  * rfc5661 is not clear about which credential should be used.
1347  *
1348  * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1349  * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1350  * we always send layoutcommit after DS writes.
1351  */
1352 static void
1353 ff_layout_set_layoutcommit(struct inode *inode,
1354                 struct pnfs_layout_segment *lseg,
1355                 loff_t end_offset)
1356 {
1357         if (!ff_layout_need_layoutcommit(lseg))
1358                 return;
1359
1360         pnfs_set_layoutcommit(inode, lseg, end_offset);
1361         dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1362                 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1363 }
1364
1365 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1366                 struct nfs_pgio_header *hdr)
1367 {
1368         if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1369                 return;
1370         nfs4_ff_layout_stat_io_start_read(hdr->inode,
1371                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1372                         hdr->args.count,
1373                         task->tk_start);
1374 }
1375
1376 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1377                 struct nfs_pgio_header *hdr)
1378 {
1379         if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1380                 return;
1381         nfs4_ff_layout_stat_io_end_read(task,
1382                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1383                         hdr->args.count,
1384                         hdr->res.count);
1385         set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1386 }
1387
1388 static int ff_layout_read_prepare_common(struct rpc_task *task,
1389                                          struct nfs_pgio_header *hdr)
1390 {
1391         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1392                 rpc_exit(task, -EIO);
1393                 return -EIO;
1394         }
1395
1396         ff_layout_read_record_layoutstats_start(task, hdr);
1397         return 0;
1398 }
1399
1400 /*
1401  * Call ops for the async read/write cases
1402  * In the case of dense layouts, the offset needs to be reset to its
1403  * original value.
1404  */
1405 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1406 {
1407         struct nfs_pgio_header *hdr = data;
1408
1409         if (ff_layout_read_prepare_common(task, hdr))
1410                 return;
1411
1412         rpc_call_start(task);
1413 }
1414
1415 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1416 {
1417         struct nfs_pgio_header *hdr = data;
1418
1419         if (nfs4_setup_sequence(hdr->ds_clp,
1420                                 &hdr->args.seq_args,
1421                                 &hdr->res.seq_res,
1422                                 task))
1423                 return;
1424
1425         ff_layout_read_prepare_common(task, hdr);
1426 }
1427
1428 static void
1429 ff_layout_io_prepare_transmit(struct rpc_task *task,
1430                 void *data)
1431 {
1432         struct nfs_pgio_header *hdr = data;
1433
1434         if (!pnfs_is_valid_lseg(hdr->lseg))
1435                 rpc_exit(task, -EAGAIN);
1436 }
1437
1438 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1439 {
1440         struct nfs_pgio_header *hdr = data;
1441
1442         dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1443
1444         if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1445             task->tk_status == 0) {
1446                 nfs4_sequence_done(task, &hdr->res.seq_res);
1447                 return;
1448         }
1449
1450         /* Note this may cause RPC to be resent */
1451         hdr->mds_ops->rpc_call_done(task, hdr);
1452 }
1453
1454 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1455 {
1456         struct nfs_pgio_header *hdr = data;
1457
1458         ff_layout_read_record_layoutstats_done(task, hdr);
1459         rpc_count_iostats_metrics(task,
1460             &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1461 }
1462
1463 static void ff_layout_read_release(void *data)
1464 {
1465         struct nfs_pgio_header *hdr = data;
1466
1467         ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1468         if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1469                 ff_layout_send_layouterror(hdr->lseg);
1470                 pnfs_read_resend_pnfs(hdr);
1471         } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1472                 ff_layout_reset_read(hdr);
1473         pnfs_generic_rw_release(data);
1474 }
1475
1476
1477 static int ff_layout_write_done_cb(struct rpc_task *task,
1478                                 struct nfs_pgio_header *hdr)
1479 {
1480         loff_t end_offs = 0;
1481         int err;
1482
1483         trace_nfs4_pnfs_write(hdr, task->tk_status);
1484         if (task->tk_status < 0)
1485                 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1486                                             hdr->args.offset, hdr->args.count,
1487                                             hdr->res.op_status, OP_WRITE,
1488                                             task->tk_status);
1489         err = ff_layout_async_handle_error(task, hdr->args.context->state,
1490                                            hdr->ds_clp, hdr->lseg,
1491                                            hdr->pgio_mirror_idx);
1492
1493         clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1494         clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1495         switch (err) {
1496         case -NFS4ERR_RESET_TO_PNFS:
1497                 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1498                 return task->tk_status;
1499         case -NFS4ERR_RESET_TO_MDS:
1500                 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1501                 return task->tk_status;
1502         case -EAGAIN:
1503                 return -EAGAIN;
1504         }
1505
1506         if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1507             hdr->res.verf->committed == NFS_DATA_SYNC)
1508                 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1509
1510         /* Note: if the write is unstable, don't set end_offs until commit */
1511         ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1512
1513         /* zero out fattr since we don't care DS attr at all */
1514         hdr->fattr.valid = 0;
1515         if (task->tk_status >= 0)
1516                 nfs_writeback_update_inode(hdr);
1517
1518         return 0;
1519 }
1520
1521 static int ff_layout_commit_done_cb(struct rpc_task *task,
1522                                      struct nfs_commit_data *data)
1523 {
1524         int err;
1525
1526         trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1527         if (task->tk_status < 0)
1528                 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1529                                             data->args.offset, data->args.count,
1530                                             data->res.op_status, OP_COMMIT,
1531                                             task->tk_status);
1532         err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1533                                            data->lseg, data->ds_commit_index);
1534
1535         switch (err) {
1536         case -NFS4ERR_RESET_TO_PNFS:
1537                 pnfs_generic_prepare_to_resend_writes(data);
1538                 return -EAGAIN;
1539         case -NFS4ERR_RESET_TO_MDS:
1540                 pnfs_generic_prepare_to_resend_writes(data);
1541                 return -EAGAIN;
1542         case -EAGAIN:
1543                 rpc_restart_call_prepare(task);
1544                 return -EAGAIN;
1545         }
1546
1547         ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1548
1549         return 0;
1550 }
1551
1552 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1553                 struct nfs_pgio_header *hdr)
1554 {
1555         if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1556                 return;
1557         nfs4_ff_layout_stat_io_start_write(hdr->inode,
1558                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1559                         hdr->args.count,
1560                         task->tk_start);
1561 }
1562
1563 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1564                 struct nfs_pgio_header *hdr)
1565 {
1566         if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1567                 return;
1568         nfs4_ff_layout_stat_io_end_write(task,
1569                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1570                         hdr->args.count, hdr->res.count,
1571                         hdr->res.verf->committed);
1572         set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1573 }
1574
1575 static int ff_layout_write_prepare_common(struct rpc_task *task,
1576                                           struct nfs_pgio_header *hdr)
1577 {
1578         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1579                 rpc_exit(task, -EIO);
1580                 return -EIO;
1581         }
1582
1583         ff_layout_write_record_layoutstats_start(task, hdr);
1584         return 0;
1585 }
1586
1587 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1588 {
1589         struct nfs_pgio_header *hdr = data;
1590
1591         if (ff_layout_write_prepare_common(task, hdr))
1592                 return;
1593
1594         rpc_call_start(task);
1595 }
1596
1597 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1598 {
1599         struct nfs_pgio_header *hdr = data;
1600
1601         if (nfs4_setup_sequence(hdr->ds_clp,
1602                                 &hdr->args.seq_args,
1603                                 &hdr->res.seq_res,
1604                                 task))
1605                 return;
1606
1607         ff_layout_write_prepare_common(task, hdr);
1608 }
1609
1610 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1611 {
1612         struct nfs_pgio_header *hdr = data;
1613
1614         if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1615             task->tk_status == 0) {
1616                 nfs4_sequence_done(task, &hdr->res.seq_res);
1617                 return;
1618         }
1619
1620         /* Note this may cause RPC to be resent */
1621         hdr->mds_ops->rpc_call_done(task, hdr);
1622 }
1623
1624 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1625 {
1626         struct nfs_pgio_header *hdr = data;
1627
1628         ff_layout_write_record_layoutstats_done(task, hdr);
1629         rpc_count_iostats_metrics(task,
1630             &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1631 }
1632
1633 static void ff_layout_write_release(void *data)
1634 {
1635         struct nfs_pgio_header *hdr = data;
1636
1637         ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1638         if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1639                 ff_layout_send_layouterror(hdr->lseg);
1640                 ff_layout_reset_write(hdr, true);
1641         } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1642                 ff_layout_reset_write(hdr, false);
1643         pnfs_generic_rw_release(data);
1644 }
1645
1646 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1647                 struct nfs_commit_data *cdata)
1648 {
1649         if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1650                 return;
1651         nfs4_ff_layout_stat_io_start_write(cdata->inode,
1652                         FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1653                         0, task->tk_start);
1654 }
1655
1656 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1657                 struct nfs_commit_data *cdata)
1658 {
1659         struct nfs_page *req;
1660         __u64 count = 0;
1661
1662         if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1663                 return;
1664
1665         if (task->tk_status == 0) {
1666                 list_for_each_entry(req, &cdata->pages, wb_list)
1667                         count += req->wb_bytes;
1668         }
1669         nfs4_ff_layout_stat_io_end_write(task,
1670                         FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1671                         count, count, NFS_FILE_SYNC);
1672         set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
1673 }
1674
1675 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1676                 struct nfs_commit_data *cdata)
1677 {
1678         ff_layout_commit_record_layoutstats_start(task, cdata);
1679 }
1680
1681 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1682 {
1683         ff_layout_commit_prepare_common(task, data);
1684         rpc_call_start(task);
1685 }
1686
1687 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1688 {
1689         struct nfs_commit_data *wdata = data;
1690
1691         if (nfs4_setup_sequence(wdata->ds_clp,
1692                                 &wdata->args.seq_args,
1693                                 &wdata->res.seq_res,
1694                                 task))
1695                 return;
1696         ff_layout_commit_prepare_common(task, data);
1697 }
1698
1699 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1700 {
1701         pnfs_generic_write_commit_done(task, data);
1702 }
1703
1704 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1705 {
1706         struct nfs_commit_data *cdata = data;
1707
1708         ff_layout_commit_record_layoutstats_done(task, cdata);
1709         rpc_count_iostats_metrics(task,
1710             &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1711 }
1712
1713 static void ff_layout_commit_release(void *data)
1714 {
1715         struct nfs_commit_data *cdata = data;
1716
1717         ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1718         pnfs_generic_commit_release(data);
1719 }
1720
1721 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1722         .rpc_call_prepare = ff_layout_read_prepare_v3,
1723         .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
1724         .rpc_call_done = ff_layout_read_call_done,
1725         .rpc_count_stats = ff_layout_read_count_stats,
1726         .rpc_release = ff_layout_read_release,
1727 };
1728
1729 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1730         .rpc_call_prepare = ff_layout_read_prepare_v4,
1731         .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
1732         .rpc_call_done = ff_layout_read_call_done,
1733         .rpc_count_stats = ff_layout_read_count_stats,
1734         .rpc_release = ff_layout_read_release,
1735 };
1736
1737 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1738         .rpc_call_prepare = ff_layout_write_prepare_v3,
1739         .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
1740         .rpc_call_done = ff_layout_write_call_done,
1741         .rpc_count_stats = ff_layout_write_count_stats,
1742         .rpc_release = ff_layout_write_release,
1743 };
1744
1745 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1746         .rpc_call_prepare = ff_layout_write_prepare_v4,
1747         .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
1748         .rpc_call_done = ff_layout_write_call_done,
1749         .rpc_count_stats = ff_layout_write_count_stats,
1750         .rpc_release = ff_layout_write_release,
1751 };
1752
1753 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1754         .rpc_call_prepare = ff_layout_commit_prepare_v3,
1755         .rpc_call_done = ff_layout_commit_done,
1756         .rpc_count_stats = ff_layout_commit_count_stats,
1757         .rpc_release = ff_layout_commit_release,
1758 };
1759
1760 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1761         .rpc_call_prepare = ff_layout_commit_prepare_v4,
1762         .rpc_call_done = ff_layout_commit_done,
1763         .rpc_count_stats = ff_layout_commit_count_stats,
1764         .rpc_release = ff_layout_commit_release,
1765 };
1766
1767 static enum pnfs_try_status
1768 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1769 {
1770         struct pnfs_layout_segment *lseg = hdr->lseg;
1771         struct nfs4_pnfs_ds *ds;
1772         struct rpc_clnt *ds_clnt;
1773         struct nfs4_ff_layout_mirror *mirror;
1774         const struct cred *ds_cred;
1775         loff_t offset = hdr->args.offset;
1776         u32 idx = hdr->pgio_mirror_idx;
1777         int vers;
1778         struct nfs_fh *fh;
1779
1780         dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1781                 __func__, hdr->inode->i_ino,
1782                 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1783
1784         mirror = FF_LAYOUT_COMP(lseg, idx);
1785         ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
1786         if (!ds)
1787                 goto out_failed;
1788
1789         ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1790                                                    hdr->inode);
1791         if (IS_ERR(ds_clnt))
1792                 goto out_failed;
1793
1794         ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1795         if (!ds_cred)
1796                 goto out_failed;
1797
1798         vers = nfs4_ff_layout_ds_version(mirror);
1799
1800         dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1801                 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
1802
1803         hdr->pgio_done_cb = ff_layout_read_done_cb;
1804         refcount_inc(&ds->ds_clp->cl_count);
1805         hdr->ds_clp = ds->ds_clp;
1806         fh = nfs4_ff_layout_select_ds_fh(mirror);
1807         if (fh)
1808                 hdr->args.fh = fh;
1809
1810         nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1811
1812         /*
1813          * Note that if we ever decide to split across DSes,
1814          * then we may need to handle dense-like offsets.
1815          */
1816         hdr->args.offset = offset;
1817         hdr->mds_offset = offset;
1818
1819         /* Perform an asynchronous read to ds */
1820         nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1821                           vers == 3 ? &ff_layout_read_call_ops_v3 :
1822                                       &ff_layout_read_call_ops_v4,
1823                           0, RPC_TASK_SOFTCONN);
1824         put_cred(ds_cred);
1825         return PNFS_ATTEMPTED;
1826
1827 out_failed:
1828         if (ff_layout_avoid_mds_available_ds(lseg))
1829                 return PNFS_TRY_AGAIN;
1830         return PNFS_NOT_ATTEMPTED;
1831 }
1832
1833 /* Perform async writes. */
1834 static enum pnfs_try_status
1835 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1836 {
1837         struct pnfs_layout_segment *lseg = hdr->lseg;
1838         struct nfs4_pnfs_ds *ds;
1839         struct rpc_clnt *ds_clnt;
1840         struct nfs4_ff_layout_mirror *mirror;
1841         const struct cred *ds_cred;
1842         loff_t offset = hdr->args.offset;
1843         int vers;
1844         struct nfs_fh *fh;
1845         int idx = hdr->pgio_mirror_idx;
1846
1847         mirror = FF_LAYOUT_COMP(lseg, idx);
1848         ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1849         if (!ds)
1850                 goto out_failed;
1851
1852         ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1853                                                    hdr->inode);
1854         if (IS_ERR(ds_clnt))
1855                 goto out_failed;
1856
1857         ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1858         if (!ds_cred)
1859                 goto out_failed;
1860
1861         vers = nfs4_ff_layout_ds_version(mirror);
1862
1863         dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1864                 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1865                 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
1866                 vers);
1867
1868         hdr->pgio_done_cb = ff_layout_write_done_cb;
1869         refcount_inc(&ds->ds_clp->cl_count);
1870         hdr->ds_clp = ds->ds_clp;
1871         hdr->ds_commit_idx = idx;
1872         fh = nfs4_ff_layout_select_ds_fh(mirror);
1873         if (fh)
1874                 hdr->args.fh = fh;
1875
1876         nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1877
1878         /*
1879          * Note that if we ever decide to split across DSes,
1880          * then we may need to handle dense-like offsets.
1881          */
1882         hdr->args.offset = offset;
1883
1884         /* Perform an asynchronous write */
1885         nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1886                           vers == 3 ? &ff_layout_write_call_ops_v3 :
1887                                       &ff_layout_write_call_ops_v4,
1888                           sync, RPC_TASK_SOFTCONN);
1889         put_cred(ds_cred);
1890         return PNFS_ATTEMPTED;
1891
1892 out_failed:
1893         if (ff_layout_avoid_mds_available_ds(lseg))
1894                 return PNFS_TRY_AGAIN;
1895         return PNFS_NOT_ATTEMPTED;
1896 }
1897
1898 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1899 {
1900         return i;
1901 }
1902
1903 static struct nfs_fh *
1904 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1905 {
1906         struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1907
1908         /* FIXME: Assume that there is only one NFS version available
1909          * for the DS.
1910          */
1911         return &flseg->mirror_array[i]->fh_versions[0];
1912 }
1913
1914 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1915 {
1916         struct pnfs_layout_segment *lseg = data->lseg;
1917         struct nfs4_pnfs_ds *ds;
1918         struct rpc_clnt *ds_clnt;
1919         struct nfs4_ff_layout_mirror *mirror;
1920         const struct cred *ds_cred;
1921         u32 idx;
1922         int vers, ret;
1923         struct nfs_fh *fh;
1924
1925         if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1926             test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1927                 goto out_err;
1928
1929         idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1930         mirror = FF_LAYOUT_COMP(lseg, idx);
1931         ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1932         if (!ds)
1933                 goto out_err;
1934
1935         ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1936                                                    data->inode);
1937         if (IS_ERR(ds_clnt))
1938                 goto out_err;
1939
1940         ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
1941         if (!ds_cred)
1942                 goto out_err;
1943
1944         vers = nfs4_ff_layout_ds_version(mirror);
1945
1946         dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1947                 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
1948                 vers);
1949         data->commit_done_cb = ff_layout_commit_done_cb;
1950         data->cred = ds_cred;
1951         refcount_inc(&ds->ds_clp->cl_count);
1952         data->ds_clp = ds->ds_clp;
1953         fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1954         if (fh)
1955                 data->args.fh = fh;
1956
1957         ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1958                                    vers == 3 ? &ff_layout_commit_call_ops_v3 :
1959                                                &ff_layout_commit_call_ops_v4,
1960                                    how, RPC_TASK_SOFTCONN);
1961         put_cred(ds_cred);
1962         return ret;
1963 out_err:
1964         pnfs_generic_prepare_to_resend_writes(data);
1965         pnfs_generic_commit_release(data);
1966         return -EAGAIN;
1967 }
1968
1969 static int
1970 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1971                            int how, struct nfs_commit_info *cinfo)
1972 {
1973         return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1974                                             ff_layout_initiate_commit);
1975 }
1976
1977 static struct pnfs_ds_commit_info *
1978 ff_layout_get_ds_info(struct inode *inode)
1979 {
1980         struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1981
1982         if (layout == NULL)
1983                 return NULL;
1984
1985         return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1986 }
1987
1988 static void
1989 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1990 {
1991         nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1992                                                   id_node));
1993 }
1994
1995 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
1996                                   const struct nfs4_layoutreturn_args *args,
1997                                   const struct nfs4_flexfile_layoutreturn_args *ff_args)
1998 {
1999         __be32 *start;
2000
2001         start = xdr_reserve_space(xdr, 4);
2002         if (unlikely(!start))
2003                 return -E2BIG;
2004
2005         *start = cpu_to_be32(ff_args->num_errors);
2006         /* This assume we always return _ALL_ layouts */
2007         return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
2008 }
2009
2010 static void
2011 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
2012 {
2013         WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
2014 }
2015
2016 static void
2017 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2018                             const nfs4_stateid *stateid,
2019                             const struct nfs42_layoutstat_devinfo *devinfo)
2020 {
2021         __be32 *p;
2022
2023         p = xdr_reserve_space(xdr, 8 + 8);
2024         p = xdr_encode_hyper(p, devinfo->offset);
2025         p = xdr_encode_hyper(p, devinfo->length);
2026         encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2027         p = xdr_reserve_space(xdr, 4*8);
2028         p = xdr_encode_hyper(p, devinfo->read_count);
2029         p = xdr_encode_hyper(p, devinfo->read_bytes);
2030         p = xdr_encode_hyper(p, devinfo->write_count);
2031         p = xdr_encode_hyper(p, devinfo->write_bytes);
2032         encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2033 }
2034
2035 static void
2036 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2037                             const nfs4_stateid *stateid,
2038                             const struct nfs42_layoutstat_devinfo *devinfo)
2039 {
2040         ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2041         ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2042                         devinfo->ld_private.data);
2043 }
2044
2045 /* report nothing for now */
2046 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2047                 const struct nfs4_layoutreturn_args *args,
2048                 struct nfs4_flexfile_layoutreturn_args *ff_args)
2049 {
2050         __be32 *p;
2051         int i;
2052
2053         p = xdr_reserve_space(xdr, 4);
2054         *p = cpu_to_be32(ff_args->num_dev);
2055         for (i = 0; i < ff_args->num_dev; i++)
2056                 ff_layout_encode_ff_iostat(xdr,
2057                                 &args->layout->plh_stateid,
2058                                 &ff_args->devinfo[i]);
2059 }
2060
2061 static void
2062 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2063                 unsigned int num_entries)
2064 {
2065         unsigned int i;
2066
2067         for (i = 0; i < num_entries; i++) {
2068                 if (!devinfo[i].ld_private.ops)
2069                         continue;
2070                 if (!devinfo[i].ld_private.ops->free)
2071                         continue;
2072                 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2073         }
2074 }
2075
2076 static struct nfs4_deviceid_node *
2077 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2078                               struct pnfs_device *pdev, gfp_t gfp_flags)
2079 {
2080         struct nfs4_ff_layout_ds *dsaddr;
2081
2082         dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2083         if (!dsaddr)
2084                 return NULL;
2085         return &dsaddr->id_node;
2086 }
2087
2088 static void
2089 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2090                 const void *voidargs,
2091                 const struct nfs4_xdr_opaque_data *ff_opaque)
2092 {
2093         const struct nfs4_layoutreturn_args *args = voidargs;
2094         struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2095         struct xdr_buf tmp_buf = {
2096                 .head = {
2097                         [0] = {
2098                                 .iov_base = page_address(ff_args->pages[0]),
2099                         },
2100                 },
2101                 .buflen = PAGE_SIZE,
2102         };
2103         struct xdr_stream tmp_xdr;
2104         __be32 *start;
2105
2106         dprintk("%s: Begin\n", __func__);
2107
2108         xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
2109
2110         ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2111         ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2112
2113         start = xdr_reserve_space(xdr, 4);
2114         *start = cpu_to_be32(tmp_buf.len);
2115         xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2116
2117         dprintk("%s: Return\n", __func__);
2118 }
2119
2120 static void
2121 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2122 {
2123         struct nfs4_flexfile_layoutreturn_args *ff_args;
2124
2125         if (!args->data)
2126                 return;
2127         ff_args = args->data;
2128         args->data = NULL;
2129
2130         ff_layout_free_ds_ioerr(&ff_args->errors);
2131         ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2132
2133         put_page(ff_args->pages[0]);
2134         kfree(ff_args);
2135 }
2136
2137 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2138         .encode = ff_layout_encode_layoutreturn,
2139         .free = ff_layout_free_layoutreturn,
2140 };
2141
2142 static int
2143 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2144 {
2145         struct nfs4_flexfile_layoutreturn_args *ff_args;
2146         struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2147
2148         ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2149         if (!ff_args)
2150                 goto out_nomem;
2151         ff_args->pages[0] = alloc_page(GFP_KERNEL);
2152         if (!ff_args->pages[0])
2153                 goto out_nomem_free;
2154
2155         INIT_LIST_HEAD(&ff_args->errors);
2156         ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2157                         &args->range, &ff_args->errors,
2158                         FF_LAYOUTRETURN_MAXERR);
2159
2160         spin_lock(&args->inode->i_lock);
2161         ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2162                         &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2163         spin_unlock(&args->inode->i_lock);
2164
2165         args->ld_private->ops = &layoutreturn_ops;
2166         args->ld_private->data = ff_args;
2167         return 0;
2168 out_nomem_free:
2169         kfree(ff_args);
2170 out_nomem:
2171         return -ENOMEM;
2172 }
2173
2174 #ifdef CONFIG_NFS_V4_2
2175 void
2176 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2177 {
2178         struct pnfs_layout_hdr *lo = lseg->pls_layout;
2179         struct nfs42_layout_error *errors;
2180         LIST_HEAD(head);
2181
2182         if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2183                 return;
2184         ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2185         if (list_empty(&head))
2186                 return;
2187
2188         errors = kmalloc_array(NFS42_LAYOUTERROR_MAX,
2189                         sizeof(*errors), GFP_NOFS);
2190         if (errors != NULL) {
2191                 const struct nfs4_ff_layout_ds_err *pos;
2192                 size_t n = 0;
2193
2194                 list_for_each_entry(pos, &head, list) {
2195                         errors[n].offset = pos->offset;
2196                         errors[n].length = pos->length;
2197                         nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2198                         errors[n].errors[0].dev_id = pos->deviceid;
2199                         errors[n].errors[0].status = pos->status;
2200                         errors[n].errors[0].opnum = pos->opnum;
2201                         n++;
2202                         if (!list_is_last(&pos->list, &head) &&
2203                             n < NFS42_LAYOUTERROR_MAX)
2204                                 continue;
2205                         if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2206                                 break;
2207                         n = 0;
2208                 }
2209                 kfree(errors);
2210         }
2211         ff_layout_free_ds_ioerr(&head);
2212 }
2213 #else
2214 void
2215 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2216 {
2217 }
2218 #endif
2219
2220 static int
2221 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2222 {
2223         const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2224
2225         return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2226 }
2227
2228 static size_t
2229 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2230                           const int buflen)
2231 {
2232         const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2233         const struct in6_addr *addr = &sin6->sin6_addr;
2234
2235         /*
2236          * RFC 4291, Section 2.2.2
2237          *
2238          * Shorthanded ANY address
2239          */
2240         if (ipv6_addr_any(addr))
2241                 return snprintf(buf, buflen, "::");
2242
2243         /*
2244          * RFC 4291, Section 2.2.2
2245          *
2246          * Shorthanded loopback address
2247          */
2248         if (ipv6_addr_loopback(addr))
2249                 return snprintf(buf, buflen, "::1");
2250
2251         /*
2252          * RFC 4291, Section 2.2.3
2253          *
2254          * Special presentation address format for mapped v4
2255          * addresses.
2256          */
2257         if (ipv6_addr_v4mapped(addr))
2258                 return snprintf(buf, buflen, "::ffff:%pI4",
2259                                         &addr->s6_addr32[3]);
2260
2261         /*
2262          * RFC 4291, Section 2.2.1
2263          */
2264         return snprintf(buf, buflen, "%pI6c", addr);
2265 }
2266
2267 /* Derived from rpc_sockaddr2uaddr */
2268 static void
2269 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2270 {
2271         struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2272         char portbuf[RPCBIND_MAXUADDRPLEN];
2273         char addrbuf[RPCBIND_MAXUADDRLEN];
2274         char *netid;
2275         unsigned short port;
2276         int len, netid_len;
2277         __be32 *p;
2278
2279         switch (sap->sa_family) {
2280         case AF_INET:
2281                 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2282                         return;
2283                 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2284                 netid = "tcp";
2285                 netid_len = 3;
2286                 break;
2287         case AF_INET6:
2288                 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2289                         return;
2290                 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2291                 netid = "tcp6";
2292                 netid_len = 4;
2293                 break;
2294         default:
2295                 /* we only support tcp and tcp6 */
2296                 WARN_ON_ONCE(1);
2297                 return;
2298         }
2299
2300         snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2301         len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2302
2303         p = xdr_reserve_space(xdr, 4 + netid_len);
2304         xdr_encode_opaque(p, netid, netid_len);
2305
2306         p = xdr_reserve_space(xdr, 4 + len);
2307         xdr_encode_opaque(p, addrbuf, len);
2308 }
2309
2310 static void
2311 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2312                          ktime_t t)
2313 {
2314         struct timespec64 ts;
2315         __be32 *p;
2316
2317         p = xdr_reserve_space(xdr, 12);
2318         ts = ktime_to_timespec64(t);
2319         p = xdr_encode_hyper(p, ts.tv_sec);
2320         *p++ = cpu_to_be32(ts.tv_nsec);
2321 }
2322
2323 static void
2324 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2325                             struct nfs4_ff_io_stat *stat)
2326 {
2327         __be32 *p;
2328
2329         p = xdr_reserve_space(xdr, 5 * 8);
2330         p = xdr_encode_hyper(p, stat->ops_requested);
2331         p = xdr_encode_hyper(p, stat->bytes_requested);
2332         p = xdr_encode_hyper(p, stat->ops_completed);
2333         p = xdr_encode_hyper(p, stat->bytes_completed);
2334         p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2335         ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2336         ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2337 }
2338
2339 static void
2340 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2341                               const struct nfs42_layoutstat_devinfo *devinfo,
2342                               struct nfs4_ff_layout_mirror *mirror)
2343 {
2344         struct nfs4_pnfs_ds_addr *da;
2345         struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2346         struct nfs_fh *fh = &mirror->fh_versions[0];
2347         __be32 *p;
2348
2349         da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2350         dprintk("%s: DS %s: encoding address %s\n",
2351                 __func__, ds->ds_remotestr, da->da_remotestr);
2352         /* netaddr4 */
2353         ff_layout_encode_netaddr(xdr, da);
2354         /* nfs_fh4 */
2355         p = xdr_reserve_space(xdr, 4 + fh->size);
2356         xdr_encode_opaque(p, fh->data, fh->size);
2357         /* ff_io_latency4 read */
2358         spin_lock(&mirror->lock);
2359         ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2360         /* ff_io_latency4 write */
2361         ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2362         spin_unlock(&mirror->lock);
2363         /* nfstime4 */
2364         ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2365         /* bool */
2366         p = xdr_reserve_space(xdr, 4);
2367         *p = cpu_to_be32(false);
2368 }
2369
2370 static void
2371 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2372                              const struct nfs4_xdr_opaque_data *opaque)
2373 {
2374         struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2375                         struct nfs42_layoutstat_devinfo, ld_private);
2376         __be32 *start;
2377
2378         /* layoutupdate length */
2379         start = xdr_reserve_space(xdr, 4);
2380         ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2381
2382         *start = cpu_to_be32((xdr->p - start - 1) * 4);
2383 }
2384
2385 static void
2386 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2387 {
2388         struct nfs4_ff_layout_mirror *mirror = opaque->data;
2389
2390         ff_layout_put_mirror(mirror);
2391 }
2392
2393 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2394         .encode = ff_layout_encode_layoutstats,
2395         .free   = ff_layout_free_layoutstats,
2396 };
2397
2398 static int
2399 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2400                                struct nfs42_layoutstat_devinfo *devinfo,
2401                                int dev_limit)
2402 {
2403         struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2404         struct nfs4_ff_layout_mirror *mirror;
2405         struct nfs4_deviceid_node *dev;
2406         int i = 0;
2407
2408         list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2409                 if (i >= dev_limit)
2410                         break;
2411                 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2412                         continue;
2413                 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2414                         continue;
2415                 /* mirror refcount put in cleanup_layoutstats */
2416                 if (!refcount_inc_not_zero(&mirror->ref))
2417                         continue;
2418                 dev = &mirror->mirror_ds->id_node;
2419                 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2420                 devinfo->offset = 0;
2421                 devinfo->length = NFS4_MAX_UINT64;
2422                 spin_lock(&mirror->lock);
2423                 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2424                 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2425                 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2426                 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2427                 spin_unlock(&mirror->lock);
2428                 devinfo->layout_type = LAYOUT_FLEX_FILES;
2429                 devinfo->ld_private.ops = &layoutstat_ops;
2430                 devinfo->ld_private.data = mirror;
2431
2432                 devinfo++;
2433                 i++;
2434         }
2435         return i;
2436 }
2437
2438 static int
2439 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2440 {
2441         struct nfs4_flexfile_layout *ff_layout;
2442         const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2443
2444         /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2445         args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
2446         if (!args->devinfo)
2447                 return -ENOMEM;
2448
2449         spin_lock(&args->inode->i_lock);
2450         ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2451         args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2452                         &args->devinfo[0], dev_count);
2453         spin_unlock(&args->inode->i_lock);
2454         if (!args->num_dev) {
2455                 kfree(args->devinfo);
2456                 args->devinfo = NULL;
2457                 return -ENOENT;
2458         }
2459
2460         return 0;
2461 }
2462
2463 static int
2464 ff_layout_set_layoutdriver(struct nfs_server *server,
2465                 const struct nfs_fh *dummy)
2466 {
2467 #if IS_ENABLED(CONFIG_NFS_V4_2)
2468         server->caps |= NFS_CAP_LAYOUTSTATS;
2469 #endif
2470         return 0;
2471 }
2472
2473 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2474         .id                     = LAYOUT_FLEX_FILES,
2475         .name                   = "LAYOUT_FLEX_FILES",
2476         .owner                  = THIS_MODULE,
2477         .flags                  = PNFS_LAYOUTGET_ON_OPEN,
2478         .max_layoutget_response = 4096, /* 1 page or so... */
2479         .set_layoutdriver       = ff_layout_set_layoutdriver,
2480         .alloc_layout_hdr       = ff_layout_alloc_layout_hdr,
2481         .free_layout_hdr        = ff_layout_free_layout_hdr,
2482         .alloc_lseg             = ff_layout_alloc_lseg,
2483         .free_lseg              = ff_layout_free_lseg,
2484         .add_lseg               = ff_layout_add_lseg,
2485         .pg_read_ops            = &ff_layout_pg_read_ops,
2486         .pg_write_ops           = &ff_layout_pg_write_ops,
2487         .get_ds_info            = ff_layout_get_ds_info,
2488         .free_deviceid_node     = ff_layout_free_deviceid_node,
2489         .mark_request_commit    = pnfs_layout_mark_request_commit,
2490         .clear_request_commit   = pnfs_generic_clear_request_commit,
2491         .scan_commit_lists      = pnfs_generic_scan_commit_lists,
2492         .recover_commit_reqs    = pnfs_generic_recover_commit_reqs,
2493         .commit_pagelist        = ff_layout_commit_pagelist,
2494         .read_pagelist          = ff_layout_read_pagelist,
2495         .write_pagelist         = ff_layout_write_pagelist,
2496         .alloc_deviceid_node    = ff_layout_alloc_deviceid_node,
2497         .prepare_layoutreturn   = ff_layout_prepare_layoutreturn,
2498         .sync                   = pnfs_nfs_generic_sync,
2499         .prepare_layoutstats    = ff_layout_prepare_layoutstats,
2500 };
2501
2502 static int __init nfs4flexfilelayout_init(void)
2503 {
2504         printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2505                __func__);
2506         return pnfs_register_layoutdriver(&flexfilelayout_type);
2507 }
2508
2509 static void __exit nfs4flexfilelayout_exit(void)
2510 {
2511         printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2512                __func__);
2513         pnfs_unregister_layoutdriver(&flexfilelayout_type);
2514 }
2515
2516 MODULE_ALIAS("nfs-layouttype4-4");
2517
2518 MODULE_LICENSE("GPL");
2519 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2520
2521 module_init(nfs4flexfilelayout_init);
2522 module_exit(nfs4flexfilelayout_exit);
2523
2524 module_param(io_maxretrans, ushort, 0644);
2525 MODULE_PARM_DESC(io_maxretrans, "The  number of times the NFSv4.1 client "
2526                         "retries an I/O request before returning an error. ");