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 <[email protected]>
   8  */
   9
  10 #include <linux/nfs_fs.h>
  11 #include <linux/nfs_mount.h>
  12 #include <linux/nfs_page.h>
  13 #include <linux/module.h>
  14 #include <linux/file.h>
  15 #include <linux/sched/mm.h>
  16
  17 #include <linux/sunrpc/metrics.h>
  18
  19 #include "flexfilelayout.h"
  20 #include "../nfs4session.h"
  21 #include "../nfs4idmap.h"
  22 #include "../internal.h"
  23 #include "../delegation.h"
  24 #include "../nfs4trace.h"
  25 #include "../iostat.h"
  26 #include "../nfs.h"
  27 #include "../nfs42.h"
  28
  29 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
  30
  31 #define FF_LAYOUT_POLL_RETRY_MAX     (15*HZ)
  32 #define FF_LAYOUTRETURN_MAXERR 20
  33
  34 enum nfs4_ff_op_type {
  35         NFS4_FF_OP_LAYOUTSTATS,
  36         NFS4_FF_OP_LAYOUTRETURN,
  37 };
  38
  39 static unsigned short io_maxretrans;
  40
  41 static const struct pnfs_commit_ops ff_layout_commit_ops;
  42 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
  43                 struct nfs_pgio_header *hdr);
  44 static int
  45 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
  46                                struct nfs42_layoutstat_devinfo *devinfo,
  47                                int dev_limit, enum nfs4_ff_op_type type);
  48 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
  49                               const struct nfs42_layoutstat_devinfo *devinfo,
  50                               struct nfs4_ff_layout_mirror *mirror);
  51
  52 static struct pnfs_layout_hdr *
  53 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
  54 {
  55         struct nfs4_flexfile_layout *ffl;
  56
  57         ffl = kzalloc(sizeof(*ffl), gfp_flags);
  58         if (ffl) {
  59                 pnfs_init_ds_commit_info(&ffl->commit_info);
  60                 INIT_LIST_HEAD(&ffl->error_list);
  61                 INIT_LIST_HEAD(&ffl->mirrors);
  62                 ffl->last_report_time = ktime_get();
  63                 ffl->commit_info.ops = &ff_layout_commit_ops;
  64                 return &ffl->generic_hdr;
  65         } else
  66                 return NULL;
  67 }
  68
  69 static void
  70 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
  71 {
  72         struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo);
  73         struct nfs4_ff_layout_ds_err *err, *n;
  74
  75         list_for_each_entry_safe(err, n, &ffl->error_list, list) {
  76                 list_del(&err->list);
  77                 kfree(err);
  78         }
  79         kfree_rcu(ffl, generic_hdr.plh_rcu);
  80 }
  81
  82 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
  83 {
  84         __be32 *p;
  85
  86         p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
  87         if (unlikely(p == NULL))
  88                 return -ENOBUFS;
  89         stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
  90         memcpy(stateid->data, p, NFS4_STATEID_SIZE);
  91         dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
  92                 p[0], p[1], p[2], p[3]);
  93         return 0;
  94 }
  95
  96 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
  97 {
  98         __be32 *p;
  99
 100         p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
 101         if (unlikely(!p))
 102                 return -ENOBUFS;
 103         memcpy(devid, p, NFS4_DEVICEID4_SIZE);
 104         nfs4_print_deviceid(devid);
 105         return 0;
 106 }
 107
 108 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
 109 {
 110         __be32 *p;
 111
 112         p = xdr_inline_decode(xdr, 4);
 113         if (unlikely(!p))
 114                 return -ENOBUFS;
 115         fh->size = be32_to_cpup(p++);
 116         if (fh->size > NFS_MAXFHSIZE) {
 117                 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
 118                        fh->size);
 119                 return -EOVERFLOW;
 120         }
 121         /* fh.data */
 122         p = xdr_inline_decode(xdr, fh->size);
 123         if (unlikely(!p))
 124                 return -ENOBUFS;
 125         memcpy(&fh->data, p, fh->size);
 126         dprintk("%s: fh len %d\n", __func__, fh->size);
 127
 128         return 0;
 129 }
 130
 131 /*
 132  * Currently only stringified uids and gids are accepted.
 133  * I.e., kerberos is not supported to the DSes, so no pricipals.
 134  *
 135  * That means that one common function will suffice, but when
 136  * principals are added, this should be split to accomodate
 137  * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
 138  */
 139 static int
 140 decode_name(struct xdr_stream *xdr, u32 *id)
 141 {
 142         __be32 *p;
 143         int len;
 144
 145         /* opaque_length(4)*/
 146         p = xdr_inline_decode(xdr, 4);
 147         if (unlikely(!p))
 148                 return -ENOBUFS;
 149         len = be32_to_cpup(p++);
 150         if (len < 0)
 151                 return -EINVAL;
 152
 153         dprintk("%s: len %u\n", __func__, len);
 154
 155         /* opaque body */
 156         p = xdr_inline_decode(xdr, len);
 157         if (unlikely(!p))
 158                 return -ENOBUFS;
 159
 160         if (!nfs_map_string_to_numeric((char *)p, len, id))
 161                 return -EINVAL;
 162
 163         return 0;
 164 }
 165
 166 static struct nfsd_file *
 167 ff_local_open_fh(struct nfs_client *clp, const struct cred *cred,
 168                  struct nfs_fh *fh, fmode_t mode)
 169 {
 170         if (mode & FMODE_WRITE) {
 171                 /*
 172                  * Always request read and write access since this corresponds
 173                  * to a rw layout.
 174                  */
 175                 mode |= FMODE_READ;
 176         }
 177
 178         return nfs_local_open_fh(clp, cred, fh, mode);
 179 }
 180
 181 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
 182                 const struct nfs4_ff_layout_mirror *m2)
 183 {
 184         int i, j;
 185
 186         if (m1->fh_versions_cnt != m2->fh_versions_cnt)
 187                 return false;
 188         for (i = 0; i < m1->fh_versions_cnt; i++) {
 189                 bool found_fh = false;
 190                 for (j = 0; j < m2->fh_versions_cnt; j++) {
 191                         if (nfs_compare_fh(&m1->fh_versions[i],
 192                                         &m2->fh_versions[j]) == 0) {
 193                                 found_fh = true;
 194                                 break;
 195                         }
 196                 }
 197                 if (!found_fh)
 198                         return false;
 199         }
 200         return true;
 201 }
 202
 203 static struct nfs4_ff_layout_mirror *
 204 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
 205                 struct nfs4_ff_layout_mirror *mirror)
 206 {
 207         struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
 208         struct nfs4_ff_layout_mirror *pos;
 209         struct inode *inode = lo->plh_inode;
 210
 211         spin_lock(&inode->i_lock);
 212         list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
 213                 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
 214                         continue;
 215                 if (!ff_mirror_match_fh(mirror, pos))
 216                         continue;
 217                 if (refcount_inc_not_zero(&pos->ref)) {
 218                         spin_unlock(&inode->i_lock);
 219                         return pos;
 220                 }
 221         }
 222         list_add(&mirror->mirrors, &ff_layout->mirrors);
 223         mirror->layout = lo;
 224         spin_unlock(&inode->i_lock);
 225         return mirror;
 226 }
 227
 228 static void
 229 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
 230 {
 231         struct inode *inode;
 232         if (mirror->layout == NULL)
 233                 return;
 234         inode = mirror->layout->plh_inode;
 235         spin_lock(&inode->i_lock);
 236         list_del(&mirror->mirrors);
 237         spin_unlock(&inode->i_lock);
 238         mirror->layout = NULL;
 239 }
 240
 241 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
 242 {
 243         struct nfs4_ff_layout_mirror *mirror;
 244
 245         mirror = kzalloc(sizeof(*mirror), gfp_flags);
 246         if (mirror != NULL) {
 247                 spin_lock_init(&mirror->lock);
 248                 refcount_set(&mirror->ref, 1);
 249                 INIT_LIST_HEAD(&mirror->mirrors);
 250         }
 251         return mirror;
 252 }
 253
 254 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
 255 {
 256         const struct cred *cred;
 257
 258         ff_layout_remove_mirror(mirror);
 259         kfree(mirror->fh_versions);
 260         cred = rcu_access_pointer(mirror->ro_cred);
 261         put_cred(cred);
 262         cred = rcu_access_pointer(mirror->rw_cred);
 263         put_cred(cred);
 264         nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
 265         kfree(mirror);
 266 }
 267
 268 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
 269 {
 270         if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
 271                 ff_layout_free_mirror(mirror);
 272 }
 273
 274 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
 275 {
 276         u32 i;
 277
 278         for (i = 0; i < fls->mirror_array_cnt; i++)
 279                 ff_layout_put_mirror(fls->mirror_array[i]);
 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_match_mirrors(struct pnfs_layout_segment *l1,
 292                 struct pnfs_layout_segment *l2)
 293 {
 294         const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1);
 295         const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1);
 296         u32 i;
 297
 298         if (fl1->mirror_array_cnt != fl2->mirror_array_cnt)
 299                 return false;
 300         for (i = 0; i < fl1->mirror_array_cnt; i++) {
 301                 if (fl1->mirror_array[i] != fl2->mirror_array[i])
 302                         return false;
 303         }
 304         return true;
 305 }
 306
 307 static bool
 308 ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
 309                 const struct pnfs_layout_range *l2)
 310 {
 311         u64 end1, end2;
 312
 313         if (l1->iomode != l2->iomode)
 314                 return l1->iomode != IOMODE_READ;
 315         end1 = pnfs_calc_offset_end(l1->offset, l1->length);
 316         end2 = pnfs_calc_offset_end(l2->offset, l2->length);
 317         if (end1 < l2->offset)
 318                 return false;
 319         if (end2 < l1->offset)
 320                 return true;
 321         return l2->offset <= l1->offset;
 322 }
 323
 324 static bool
 325 ff_lseg_merge(struct pnfs_layout_segment *new,
 326                 struct pnfs_layout_segment *old)
 327 {
 328         u64 new_end, old_end;
 329
 330         if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
 331                 return false;
 332         if (new->pls_range.iomode != old->pls_range.iomode)
 333                 return false;
 334         old_end = pnfs_calc_offset_end(old->pls_range.offset,
 335                         old->pls_range.length);
 336         if (old_end < new->pls_range.offset)
 337                 return false;
 338         new_end = pnfs_calc_offset_end(new->pls_range.offset,
 339                         new->pls_range.length);
 340         if (new_end < old->pls_range.offset)
 341                 return false;
 342         if (!ff_lseg_match_mirrors(new, old))
 343                 return false;
 344
 345         /* Mergeable: copy info from 'old' to 'new' */
 346         if (new_end < old_end)
 347                 new_end = old_end;
 348         if (new->pls_range.offset < old->pls_range.offset)
 349                 new->pls_range.offset = old->pls_range.offset;
 350         new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
 351                         new_end);
 352         if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
 353                 set_bit(NFS_LSEG_ROC, &new->pls_flags);
 354         return true;
 355 }
 356
 357 static void
 358 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
 359                 struct pnfs_layout_segment *lseg,
 360                 struct list_head *free_me)
 361 {
 362         pnfs_generic_layout_insert_lseg(lo, lseg,
 363                         ff_lseg_range_is_after,
 364                         ff_lseg_merge,
 365                         free_me);
 366 }
 367
 368 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
 369 {
 370         int i, j;
 371
 372         for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
 373                 for (j = i + 1; j < fls->mirror_array_cnt; j++)
 374                         if (fls->mirror_array[i]->efficiency <
 375                             fls->mirror_array[j]->efficiency)
 376                                 swap(fls->mirror_array[i],
 377                                      fls->mirror_array[j]);
 378         }
 379 }
 380
 381 static struct pnfs_layout_segment *
 382 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
 383                      struct nfs4_layoutget_res *lgr,
 384                      gfp_t gfp_flags)
 385 {
 386         struct pnfs_layout_segment *ret;
 387         struct nfs4_ff_layout_segment *fls = NULL;
 388         struct xdr_stream stream;
 389         struct xdr_buf buf;
 390         struct page *scratch;
 391         u64 stripe_unit;
 392         u32 mirror_array_cnt;
 393         __be32 *p;
 394         int i, rc;
 395
 396         dprintk("--> %s\n", __func__);
 397         scratch = alloc_page(gfp_flags);
 398         if (!scratch)
 399                 return ERR_PTR(-ENOMEM);
 400
 401         xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
 402                               lgr->layoutp->len);
 403         xdr_set_scratch_page(&stream, scratch);
 404
 405         /* stripe unit and mirror_array_cnt */
 406         rc = -EIO;
 407         p = xdr_inline_decode(&stream, 8 + 4);
 408         if (!p)
 409                 goto out_err_free;
 410
 411         p = xdr_decode_hyper(p, &stripe_unit);
 412         mirror_array_cnt = be32_to_cpup(p++);
 413         dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
 414                 stripe_unit, mirror_array_cnt);
 415
 416         if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
 417             mirror_array_cnt == 0)
 418                 goto out_err_free;
 419
 420         rc = -ENOMEM;
 421         fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt),
 422                         gfp_flags);
 423         if (!fls)
 424                 goto out_err_free;
 425
 426         fls->mirror_array_cnt = mirror_array_cnt;
 427         fls->stripe_unit = stripe_unit;
 428
 429         for (i = 0; i < fls->mirror_array_cnt; i++) {
 430                 struct nfs4_ff_layout_mirror *mirror;
 431                 struct cred *kcred;
 432                 const struct cred __rcu *cred;
 433                 kuid_t uid;
 434                 kgid_t gid;
 435                 u32 ds_count, fh_count, id;
 436                 int j;
 437
 438                 rc = -EIO;
 439                 p = xdr_inline_decode(&stream, 4);
 440                 if (!p)
 441                         goto out_err_free;
 442                 ds_count = be32_to_cpup(p);
 443
 444                 /* FIXME: allow for striping? */
 445                 if (ds_count != 1)
 446                         goto out_err_free;
 447
 448                 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
 449                 if (fls->mirror_array[i] == NULL) {
 450                         rc = -ENOMEM;
 451                         goto out_err_free;
 452                 }
 453
 454                 fls->mirror_array[i]->ds_count = ds_count;
 455
 456                 /* deviceid */
 457                 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
 458                 if (rc)
 459                         goto out_err_free;
 460
 461                 /* efficiency */
 462                 rc = -EIO;
 463                 p = xdr_inline_decode(&stream, 4);
 464                 if (!p)
 465                         goto out_err_free;
 466                 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
 467
 468                 /* stateid */
 469                 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
 470                 if (rc)
 471                         goto out_err_free;
 472
 473                 /* fh */
 474                 rc = -EIO;
 475                 p = xdr_inline_decode(&stream, 4);
 476                 if (!p)
 477                         goto out_err_free;
 478                 fh_count = be32_to_cpup(p);
 479
 480                 fls->mirror_array[i]->fh_versions =
 481                         kcalloc(fh_count, sizeof(struct nfs_fh),
 482                                 gfp_flags);
 483                 if (fls->mirror_array[i]->fh_versions == NULL) {
 484                         rc = -ENOMEM;
 485                         goto out_err_free;
 486                 }
 487
 488                 for (j = 0; j < fh_count; j++) {
 489                         rc = decode_nfs_fh(&stream,
 490                                            &fls->mirror_array[i]->fh_versions[j]);
 491                         if (rc)
 492                                 goto out_err_free;
 493                 }
 494
 495                 fls->mirror_array[i]->fh_versions_cnt = fh_count;
 496
 497                 /* user */
 498                 rc = decode_name(&stream, &id);
 499                 if (rc)
 500                         goto out_err_free;
 501
 502                 uid = make_kuid(&init_user_ns, id);
 503
 504                 /* group */
 505                 rc = decode_name(&stream, &id);
 506                 if (rc)
 507                         goto out_err_free;
 508
 509                 gid = make_kgid(&init_user_ns, id);
 510
 511                 if (gfp_flags & __GFP_FS)
 512                         kcred = prepare_kernel_cred(&init_task);
 513                 else {
 514                         unsigned int nofs_flags = memalloc_nofs_save();
 515                         kcred = prepare_kernel_cred(&init_task);
 516                         memalloc_nofs_restore(nofs_flags);
 517                 }
 518                 rc = -ENOMEM;
 519                 if (!kcred)
 520                         goto out_err_free;
 521                 kcred->fsuid = uid;
 522                 kcred->fsgid = gid;
 523                 cred = RCU_INITIALIZER(kcred);
 524
 525                 if (lgr->range.iomode == IOMODE_READ)
 526                         rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
 527                 else
 528                         rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
 529
 530                 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
 531                 if (mirror != fls->mirror_array[i]) {
 532                         /* swap cred ptrs so free_mirror will clean up old */
 533                         if (lgr->range.iomode == IOMODE_READ) {
 534                                 cred = xchg(&mirror->ro_cred, cred);
 535                                 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
 536                         } else {
 537                                 cred = xchg(&mirror->rw_cred, cred);
 538                                 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
 539                         }
 540                         ff_layout_free_mirror(fls->mirror_array[i]);
 541                         fls->mirror_array[i] = mirror;
 542                 }
 543
 544                 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
 545                         lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
 546                         from_kuid(&init_user_ns, uid),
 547                         from_kgid(&init_user_ns, gid));
 548         }
 549
 550         p = xdr_inline_decode(&stream, 4);
 551         if (!p)
 552                 goto out_sort_mirrors;
 553         fls->flags = be32_to_cpup(p);
 554
 555         p = xdr_inline_decode(&stream, 4);
 556         if (!p)
 557                 goto out_sort_mirrors;
 558         for (i=0; i < fls->mirror_array_cnt; i++)
 559                 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
 560
 561 out_sort_mirrors:
 562         ff_layout_sort_mirrors(fls);
 563         ret = &fls->generic_hdr;
 564         dprintk("<-- %s (success)\n", __func__);
 565 out_free_page:
 566         __free_page(scratch);
 567         return ret;
 568 out_err_free:
 569         _ff_layout_free_lseg(fls);
 570         ret = ERR_PTR(rc);
 571         dprintk("<-- %s (%d)\n", __func__, rc);
 572         goto out_free_page;
 573 }
 574
 575 static void
 576 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
 577 {
 578         struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
 579
 580         dprintk("--> %s\n", __func__);
 581
 582         if (lseg->pls_range.iomode == IOMODE_RW) {
 583                 struct nfs4_flexfile_layout *ffl;
 584                 struct inode *inode;
 585
 586                 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
 587                 inode = ffl->generic_hdr.plh_inode;
 588                 spin_lock(&inode->i_lock);
 589                 pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg);
 590                 spin_unlock(&inode->i_lock);
 591         }
 592         _ff_layout_free_lseg(fls);
 593 }
 594
 595 static void
 596 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
 597 {
 598         /* first IO request? */
 599         if (atomic_inc_return(&timer->n_ops) == 1) {
 600                 timer->start_time = now;
 601         }
 602 }
 603
 604 static ktime_t
 605 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
 606 {
 607         ktime_t start;
 608
 609         if (atomic_dec_return(&timer->n_ops) < 0)
 610                 WARN_ON_ONCE(1);
 611
 612         start = timer->start_time;
 613         timer->start_time = now;
 614         return ktime_sub(now, start);
 615 }
 616
 617 static bool
 618 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
 619                             struct nfs4_ff_layoutstat *layoutstat,
 620                             ktime_t now)
 621 {
 622         s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
 623         struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
 624
 625         nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
 626         if (!mirror->start_time)
 627                 mirror->start_time = now;
 628         if (mirror->report_interval != 0)
 629                 report_interval = (s64)mirror->report_interval * 1000LL;
 630         else if (layoutstats_timer != 0)
 631                 report_interval = (s64)layoutstats_timer * 1000LL;
 632         if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
 633                         report_interval) {
 634                 ffl->last_report_time = now;
 635                 return true;
 636         }
 637
 638         return false;
 639 }
 640
 641 static void
 642 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
 643                 __u64 requested)
 644 {
 645         struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
 646
 647         iostat->ops_requested++;
 648         iostat->bytes_requested += requested;
 649 }
 650
 651 static void
 652 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
 653                 __u64 requested,
 654                 __u64 completed,
 655                 ktime_t time_completed,
 656                 ktime_t time_started)
 657 {
 658         struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
 659         ktime_t completion_time = ktime_sub(time_completed, time_started);
 660         ktime_t timer;
 661
 662         iostat->ops_completed++;
 663         iostat->bytes_completed += completed;
 664         iostat->bytes_not_delivered += requested - completed;
 665
 666         timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
 667         iostat->total_busy_time =
 668                         ktime_add(iostat->total_busy_time, timer);
 669         iostat->aggregate_completion_time =
 670                         ktime_add(iostat->aggregate_completion_time,
 671                                         completion_time);
 672 }
 673
 674 static void
 675 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
 676                 struct nfs4_ff_layout_mirror *mirror,
 677                 __u64 requested, ktime_t now)
 678 {
 679         bool report;
 680
 681         spin_lock(&mirror->lock);
 682         report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
 683         nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
 684         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 685         spin_unlock(&mirror->lock);
 686
 687         if (report)
 688                 pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
 689 }
 690
 691 static void
 692 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
 693                 struct nfs4_ff_layout_mirror *mirror,
 694                 __u64 requested,
 695                 __u64 completed)
 696 {
 697         spin_lock(&mirror->lock);
 698         nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
 699                         requested, completed,
 700                         ktime_get(), task->tk_start);
 701         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 702         spin_unlock(&mirror->lock);
 703 }
 704
 705 static void
 706 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
 707                 struct nfs4_ff_layout_mirror *mirror,
 708                 __u64 requested, ktime_t now)
 709 {
 710         bool report;
 711
 712         spin_lock(&mirror->lock);
 713         report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
 714         nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
 715         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 716         spin_unlock(&mirror->lock);
 717
 718         if (report)
 719                 pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
 720 }
 721
 722 static void
 723 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
 724                 struct nfs4_ff_layout_mirror *mirror,
 725                 __u64 requested,
 726                 __u64 completed,
 727                 enum nfs3_stable_how committed)
 728 {
 729         if (committed == NFS_UNSTABLE)
 730                 requested = completed = 0;
 731
 732         spin_lock(&mirror->lock);
 733         nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
 734                         requested, completed, ktime_get(), task->tk_start);
 735         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 736         spin_unlock(&mirror->lock);
 737 }
 738
 739 static void
 740 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx)
 741 {
 742         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
 743
 744         if (devid)
 745                 nfs4_mark_deviceid_unavailable(devid);
 746 }
 747
 748 static void
 749 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx)
 750 {
 751         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
 752
 753         if (devid)
 754                 nfs4_mark_deviceid_available(devid);
 755 }
 756
 757 static struct nfs4_pnfs_ds *
 758 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
 759                              u32 start_idx, u32 *best_idx,
 760                              bool check_device)
 761 {
 762         struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
 763         struct nfs4_ff_layout_mirror *mirror;
 764         struct nfs4_pnfs_ds *ds;
 765         u32 idx;
 766
 767         /* mirrors are initially sorted by efficiency */
 768         for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
 769                 mirror = FF_LAYOUT_COMP(lseg, idx);
 770                 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
 771                 if (!ds)
 772                         continue;
 773
 774                 if (check_device &&
 775                     nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
 776                         continue;
 777
 778                 *best_idx = idx;
 779                 return ds;
 780         }
 781
 782         return NULL;
 783 }
 784
 785 static struct nfs4_pnfs_ds *
 786 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
 787                                  u32 start_idx, u32 *best_idx)
 788 {
 789         return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
 790 }
 791
 792 static struct nfs4_pnfs_ds *
 793 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
 794                                    u32 start_idx, u32 *best_idx)
 795 {
 796         return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
 797 }
 798
 799 static struct nfs4_pnfs_ds *
 800 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
 801                                   u32 start_idx, u32 *best_idx)
 802 {
 803         struct nfs4_pnfs_ds *ds;
 804
 805         ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
 806         if (ds)
 807                 return ds;
 808         return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
 809 }
 810
 811 static struct nfs4_pnfs_ds *
 812 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
 813                           u32 *best_idx)
 814 {
 815         struct pnfs_layout_segment *lseg = pgio->pg_lseg;
 816         struct nfs4_pnfs_ds *ds;
 817
 818         ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx,
 819                                                best_idx);
 820         if (ds || !pgio->pg_mirror_idx)
 821                 return ds;
 822         return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx);
 823 }
 824
 825 static void
 826 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
 827                       struct nfs_page *req,
 828                       bool strict_iomode)
 829 {
 830         pnfs_put_lseg(pgio->pg_lseg);
 831         pgio->pg_lseg =
 832                 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
 833                                    req_offset(req), req->wb_bytes, IOMODE_READ,
 834                                    strict_iomode, nfs_io_gfp_mask());
 835         if (IS_ERR(pgio->pg_lseg)) {
 836                 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
 837                 pgio->pg_lseg = NULL;
 838         }
 839 }
 840
 841 static void
 842 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
 843                         struct nfs_page *req)
 844 {
 845         struct nfs_pgio_mirror *pgm;
 846         struct nfs4_ff_layout_mirror *mirror;
 847         struct nfs4_pnfs_ds *ds;
 848         u32 ds_idx;
 849
 850 retry:
 851         pnfs_generic_pg_check_layout(pgio, req);
 852         /* Use full layout for now */
 853         if (!pgio->pg_lseg) {
 854                 ff_layout_pg_get_read(pgio, req, false);
 855                 if (!pgio->pg_lseg)
 856                         goto out_nolseg;
 857         }
 858         if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
 859                 ff_layout_pg_get_read(pgio, req, true);
 860                 if (!pgio->pg_lseg)
 861                         goto out_nolseg;
 862         }
 863
 864         ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
 865         if (!ds) {
 866                 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
 867                         goto out_mds;
 868                 pnfs_generic_pg_cleanup(pgio);
 869                 /* Sleep for 1 second before retrying */
 870                 ssleep(1);
 871                 goto retry;
 872         }
 873
 874         mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
 875         pgm = &pgio->pg_mirrors[0];
 876         pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
 877
 878         pgio->pg_mirror_idx = ds_idx;
 879
 880         if (NFS_SERVER(pgio->pg_inode)->flags &
 881                         (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
 882                 pgio->pg_maxretrans = io_maxretrans;
 883         return;
 884 out_nolseg:
 885         if (pgio->pg_error < 0)
 886                 return;
 887 out_mds:
 888         trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
 889                         0, NFS4_MAX_UINT64, IOMODE_READ,
 890                         NFS_I(pgio->pg_inode)->layout,
 891                         pgio->pg_lseg);
 892         pgio->pg_maxretrans = 0;
 893         nfs_pageio_reset_read_mds(pgio);
 894 }
 895
 896 static void
 897 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
 898                         struct nfs_page *req)
 899 {
 900         struct nfs4_ff_layout_mirror *mirror;
 901         struct nfs_pgio_mirror *pgm;
 902         struct nfs4_pnfs_ds *ds;
 903         u32 i;
 904
 905 retry:
 906         pnfs_generic_pg_check_layout(pgio, req);
 907         if (!pgio->pg_lseg) {
 908                 pgio->pg_lseg =
 909                         pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
 910                                            req_offset(req), req->wb_bytes,
 911                                            IOMODE_RW, false, nfs_io_gfp_mask());
 912                 if (IS_ERR(pgio->pg_lseg)) {
 913                         pgio->pg_error = PTR_ERR(pgio->pg_lseg);
 914                         pgio->pg_lseg = NULL;
 915                         return;
 916                 }
 917         }
 918         /* If no lseg, fall back to write through mds */
 919         if (pgio->pg_lseg == NULL)
 920                 goto out_mds;
 921
 922         /* Use a direct mapping of ds_idx to pgio mirror_idx */
 923         if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
 924                 goto out_eagain;
 925
 926         for (i = 0; i < pgio->pg_mirror_count; i++) {
 927                 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
 928                 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
 929                 if (!ds) {
 930                         if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
 931                                 goto out_mds;
 932                         pnfs_generic_pg_cleanup(pgio);
 933                         /* Sleep for 1 second before retrying */
 934                         ssleep(1);
 935                         goto retry;
 936                 }
 937                 pgm = &pgio->pg_mirrors[i];
 938                 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
 939         }
 940
 941         if (NFS_SERVER(pgio->pg_inode)->flags &
 942                         (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
 943                 pgio->pg_maxretrans = io_maxretrans;
 944         return;
 945 out_eagain:
 946         pnfs_generic_pg_cleanup(pgio);
 947         pgio->pg_error = -EAGAIN;
 948         return;
 949 out_mds:
 950         trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
 951                         0, NFS4_MAX_UINT64, IOMODE_RW,
 952                         NFS_I(pgio->pg_inode)->layout,
 953                         pgio->pg_lseg);
 954         pgio->pg_maxretrans = 0;
 955         nfs_pageio_reset_write_mds(pgio);
 956         pgio->pg_error = -EAGAIN;
 957 }
 958
 959 static unsigned int
 960 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
 961                                     struct nfs_page *req)
 962 {
 963         if (!pgio->pg_lseg) {
 964                 pgio->pg_lseg =
 965                         pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
 966                                            req_offset(req), req->wb_bytes,
 967                                            IOMODE_RW, false, nfs_io_gfp_mask());
 968                 if (IS_ERR(pgio->pg_lseg)) {
 969                         pgio->pg_error = PTR_ERR(pgio->pg_lseg);
 970                         pgio->pg_lseg = NULL;
 971                         goto out;
 972                 }
 973         }
 974         if (pgio->pg_lseg)
 975                 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
 976
 977         trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
 978                         0, NFS4_MAX_UINT64, IOMODE_RW,
 979                         NFS_I(pgio->pg_inode)->layout,
 980                         pgio->pg_lseg);
 981         /* no lseg means that pnfs is not in use, so no mirroring here */
 982         nfs_pageio_reset_write_mds(pgio);
 983 out:
 984         return 1;
 985 }
 986
 987 static u32
 988 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
 989 {
 990         u32 old = desc->pg_mirror_idx;
 991
 992         desc->pg_mirror_idx = idx;
 993         return old;
 994 }
 995
 996 static struct nfs_pgio_mirror *
 997 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
 998 {
 999         return &desc->pg_mirrors[idx];
1000 }
1001
1002 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
1003         .pg_init = ff_layout_pg_init_read,
1004         .pg_test = pnfs_generic_pg_test,
1005         .pg_doio = pnfs_generic_pg_readpages,
1006         .pg_cleanup = pnfs_generic_pg_cleanup,
1007 };
1008
1009 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1010         .pg_init = ff_layout_pg_init_write,
1011         .pg_test = pnfs_generic_pg_test,
1012         .pg_doio = pnfs_generic_pg_writepages,
1013         .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1014         .pg_cleanup = pnfs_generic_pg_cleanup,
1015         .pg_get_mirror = ff_layout_pg_get_mirror_write,
1016         .pg_set_mirror = ff_layout_pg_set_mirror_write,
1017 };
1018
1019 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1020 {
1021         struct rpc_task *task = &hdr->task;
1022
1023         pnfs_layoutcommit_inode(hdr->inode, false);
1024
1025         if (retry_pnfs) {
1026                 dprintk("%s Reset task %5u for i/o through pNFS "
1027                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1028                         hdr->task.tk_pid,
1029                         hdr->inode->i_sb->s_id,
1030                         (unsigned long long)NFS_FILEID(hdr->inode),
1031                         hdr->args.count,
1032                         (unsigned long long)hdr->args.offset);
1033
1034                 hdr->completion_ops->reschedule_io(hdr);
1035                 return;
1036         }
1037
1038         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1039                 dprintk("%s Reset task %5u for i/o through MDS "
1040                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1041                         hdr->task.tk_pid,
1042                         hdr->inode->i_sb->s_id,
1043                         (unsigned long long)NFS_FILEID(hdr->inode),
1044                         hdr->args.count,
1045                         (unsigned long long)hdr->args.offset);
1046
1047                 trace_pnfs_mds_fallback_write_done(hdr->inode,
1048                                 hdr->args.offset, hdr->args.count,
1049                                 IOMODE_RW, NFS_I(hdr->inode)->layout,
1050                                 hdr->lseg);
1051                 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1052         }
1053 }
1054
1055 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr)
1056 {
1057         u32 idx = hdr->pgio_mirror_idx + 1;
1058         u32 new_idx = 0;
1059
1060         if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx))
1061                 ff_layout_send_layouterror(hdr->lseg);
1062         else
1063                 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1064         pnfs_read_resend_pnfs(hdr, new_idx);
1065 }
1066
1067 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1068 {
1069         struct rpc_task *task = &hdr->task;
1070
1071         pnfs_layoutcommit_inode(hdr->inode, false);
1072         pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1073
1074         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1075                 dprintk("%s Reset task %5u for i/o through MDS "
1076                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1077                         hdr->task.tk_pid,
1078                         hdr->inode->i_sb->s_id,
1079                         (unsigned long long)NFS_FILEID(hdr->inode),
1080                         hdr->args.count,
1081                         (unsigned long long)hdr->args.offset);
1082
1083                 trace_pnfs_mds_fallback_read_done(hdr->inode,
1084                                 hdr->args.offset, hdr->args.count,
1085                                 IOMODE_READ, NFS_I(hdr->inode)->layout,
1086                                 hdr->lseg);
1087                 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1088         }
1089 }
1090
1091 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1092                                            struct nfs4_state *state,
1093                                            struct nfs_client *clp,
1094                                            struct pnfs_layout_segment *lseg,
1095                                            u32 idx)
1096 {
1097         struct pnfs_layout_hdr *lo = lseg->pls_layout;
1098         struct inode *inode = lo->plh_inode;
1099         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1100         struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1101
1102         switch (task->tk_status) {
1103         case -NFS4ERR_BADSESSION:
1104         case -NFS4ERR_BADSLOT:
1105         case -NFS4ERR_BAD_HIGH_SLOT:
1106         case -NFS4ERR_DEADSESSION:
1107         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1108         case -NFS4ERR_SEQ_FALSE_RETRY:
1109         case -NFS4ERR_SEQ_MISORDERED:
1110                 dprintk("%s ERROR %d, Reset session. Exchangeid "
1111                         "flags 0x%x\n", __func__, task->tk_status,
1112                         clp->cl_exchange_flags);
1113                 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1114                 break;
1115         case -NFS4ERR_DELAY:
1116         case -NFS4ERR_GRACE:
1117                 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1118                 break;
1119         case -NFS4ERR_RETRY_UNCACHED_REP:
1120                 break;
1121         /* Invalidate Layout errors */
1122         case -NFS4ERR_PNFS_NO_LAYOUT:
1123         case -ESTALE:           /* mapped NFS4ERR_STALE */
1124         case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
1125         case -EISDIR:           /* mapped NFS4ERR_ISDIR */
1126         case -NFS4ERR_FHEXPIRED:
1127         case -NFS4ERR_WRONG_TYPE:
1128                 dprintk("%s Invalid layout error %d\n", __func__,
1129                         task->tk_status);
1130                 /*
1131                  * Destroy layout so new i/o will get a new layout.
1132                  * Layout will not be destroyed until all current lseg
1133                  * references are put. Mark layout as invalid to resend failed
1134                  * i/o and all i/o waiting on the slot table to the MDS until
1135                  * layout is destroyed and a new valid layout is obtained.
1136                  */
1137                 pnfs_destroy_layout(NFS_I(inode));
1138                 rpc_wake_up(&tbl->slot_tbl_waitq);
1139                 goto reset;
1140         /* RPC connection errors */
1141         case -ECONNREFUSED:
1142         case -EHOSTDOWN:
1143         case -EHOSTUNREACH:
1144         case -ENETUNREACH:
1145         case -EIO:
1146         case -ETIMEDOUT:
1147         case -EPIPE:
1148         case -EPROTO:
1149         case -ENODEV:
1150                 dprintk("%s DS connection error %d\n", __func__,
1151                         task->tk_status);
1152                 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1153                                 &devid->deviceid);
1154                 rpc_wake_up(&tbl->slot_tbl_waitq);
1155                 fallthrough;
1156         default:
1157                 if (ff_layout_avoid_mds_available_ds(lseg))
1158                         return -NFS4ERR_RESET_TO_PNFS;
1159 reset:
1160                 dprintk("%s Retry through MDS. Error %d\n", __func__,
1161                         task->tk_status);
1162                 return -NFS4ERR_RESET_TO_MDS;
1163         }
1164         task->tk_status = 0;
1165         return -EAGAIN;
1166 }
1167
1168 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1169 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1170                                            struct pnfs_layout_segment *lseg,
1171                                            u32 idx)
1172 {
1173         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1174
1175         switch (task->tk_status) {
1176         /* File access problems. Don't mark the device as unavailable */
1177         case -EACCES:
1178         case -ESTALE:
1179         case -EISDIR:
1180         case -EBADHANDLE:
1181         case -ELOOP:
1182         case -ENOSPC:
1183                 break;
1184         case -EJUKEBOX:
1185                 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1186                 goto out_retry;
1187         default:
1188                 dprintk("%s DS connection error %d\n", __func__,
1189                         task->tk_status);
1190                 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1191                                 &devid->deviceid);
1192         }
1193         /* FIXME: Need to prevent infinite looping here. */
1194         return -NFS4ERR_RESET_TO_PNFS;
1195 out_retry:
1196         task->tk_status = 0;
1197         rpc_restart_call_prepare(task);
1198         rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1199         return -EAGAIN;
1200 }
1201
1202 static int ff_layout_async_handle_error(struct rpc_task *task,
1203                                         struct nfs4_state *state,
1204                                         struct nfs_client *clp,
1205                                         struct pnfs_layout_segment *lseg,
1206                                         u32 idx)
1207 {
1208         int vers = clp->cl_nfs_mod->rpc_vers->number;
1209
1210         if (task->tk_status >= 0) {
1211                 ff_layout_mark_ds_reachable(lseg, idx);
1212                 return 0;
1213         }
1214
1215         /* Handle the case of an invalid layout segment */
1216         if (!pnfs_is_valid_lseg(lseg))
1217                 return -NFS4ERR_RESET_TO_PNFS;
1218
1219         switch (vers) {
1220         case 3:
1221                 return ff_layout_async_handle_error_v3(task, lseg, idx);
1222         case 4:
1223                 return ff_layout_async_handle_error_v4(task, state, clp,
1224                                                        lseg, idx);
1225         default:
1226                 /* should never happen */
1227                 WARN_ON_ONCE(1);
1228                 return 0;
1229         }
1230 }
1231
1232 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1233                                         u32 idx, u64 offset, u64 length,
1234                                         u32 *op_status, int opnum, int error)
1235 {
1236         struct nfs4_ff_layout_mirror *mirror;
1237         u32 status = *op_status;
1238         int err;
1239
1240         if (status == 0) {
1241                 switch (error) {
1242                 case -ETIMEDOUT:
1243                 case -EPFNOSUPPORT:
1244                 case -EPROTONOSUPPORT:
1245                 case -EOPNOTSUPP:
1246                 case -EINVAL:
1247                 case -ECONNREFUSED:
1248                 case -ECONNRESET:
1249                 case -EHOSTDOWN:
1250                 case -EHOSTUNREACH:
1251                 case -ENETUNREACH:
1252                 case -EADDRINUSE:
1253                 case -ENOBUFS:
1254                 case -EPIPE:
1255                 case -EPERM:
1256                 case -EPROTO:
1257                 case -ENODEV:
1258                         *op_status = status = NFS4ERR_NXIO;
1259                         break;
1260                 case -EACCES:
1261                         *op_status = status = NFS4ERR_ACCESS;
1262                         break;
1263                 default:
1264                         return;
1265                 }
1266         }
1267
1268         mirror = FF_LAYOUT_COMP(lseg, idx);
1269         err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1270                                        mirror, offset, length, status, opnum,
1271                                        nfs_io_gfp_mask());
1272
1273         switch (status) {
1274         case NFS4ERR_DELAY:
1275         case NFS4ERR_GRACE:
1276                 break;
1277         case NFS4ERR_NXIO:
1278                 ff_layout_mark_ds_unreachable(lseg, idx);
1279                 /*
1280                  * Don't return the layout if this is a read and we still
1281                  * have layouts to try
1282                  */
1283                 if (opnum == OP_READ)
1284                         break;
1285                 fallthrough;
1286         default:
1287                 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
1288                                                   lseg);
1289         }
1290
1291         dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1292 }
1293
1294 /* NFS_PROTO call done callback routines */
1295 static int ff_layout_read_done_cb(struct rpc_task *task,
1296                                 struct nfs_pgio_header *hdr)
1297 {
1298         int err;
1299
1300         if (task->tk_status < 0) {
1301                 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1302                                             hdr->args.offset, hdr->args.count,
1303                                             &hdr->res.op_status, OP_READ,
1304                                             task->tk_status);
1305                 trace_ff_layout_read_error(hdr);
1306         }
1307
1308         err = ff_layout_async_handle_error(task, hdr->args.context->state,
1309                                            hdr->ds_clp, hdr->lseg,
1310                                            hdr->pgio_mirror_idx);
1311
1312         trace_nfs4_pnfs_read(hdr, err);
1313         clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1314         clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1315         switch (err) {
1316         case -NFS4ERR_RESET_TO_PNFS:
1317                 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1318                 return task->tk_status;
1319         case -NFS4ERR_RESET_TO_MDS:
1320                 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1321                 return task->tk_status;
1322         case -EAGAIN:
1323                 goto out_eagain;
1324         }
1325
1326         return 0;
1327 out_eagain:
1328         rpc_restart_call_prepare(task);
1329         return -EAGAIN;
1330 }
1331
1332 static bool
1333 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1334 {
1335         return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1336 }
1337
1338 /*
1339  * We reference the rpc_cred of the first WRITE that triggers the need for
1340  * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1341  * rfc5661 is not clear about which credential should be used.
1342  *
1343  * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1344  * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1345  * we always send layoutcommit after DS writes.
1346  */
1347 static void
1348 ff_layout_set_layoutcommit(struct inode *inode,
1349                 struct pnfs_layout_segment *lseg,
1350                 loff_t end_offset)
1351 {
1352         if (!ff_layout_need_layoutcommit(lseg))
1353                 return;
1354
1355         pnfs_set_layoutcommit(inode, lseg, end_offset);
1356         dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1357                 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1358 }
1359
1360 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1361                 struct nfs_pgio_header *hdr)
1362 {
1363         if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1364                 return;
1365         nfs4_ff_layout_stat_io_start_read(hdr->inode,
1366                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1367                         hdr->args.count,
1368                         task->tk_start);
1369 }
1370
1371 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1372                 struct nfs_pgio_header *hdr)
1373 {
1374         if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1375                 return;
1376         nfs4_ff_layout_stat_io_end_read(task,
1377                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1378                         hdr->args.count,
1379                         hdr->res.count);
1380         set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1381 }
1382
1383 static int ff_layout_read_prepare_common(struct rpc_task *task,
1384                                          struct nfs_pgio_header *hdr)
1385 {
1386         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1387                 rpc_exit(task, -EIO);
1388                 return -EIO;
1389         }
1390
1391         if (!pnfs_is_valid_lseg(hdr->lseg)) {
1392                 rpc_exit(task, -EAGAIN);
1393                 return -EAGAIN;
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 ff_layout_read_call_done(struct rpc_task *task, void *data)
1429 {
1430         struct nfs_pgio_header *hdr = data;
1431
1432         if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1433             task->tk_status == 0) {
1434                 nfs4_sequence_done(task, &hdr->res.seq_res);
1435                 return;
1436         }
1437
1438         /* Note this may cause RPC to be resent */
1439         hdr->mds_ops->rpc_call_done(task, hdr);
1440 }
1441
1442 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1443 {
1444         struct nfs_pgio_header *hdr = data;
1445
1446         ff_layout_read_record_layoutstats_done(task, hdr);
1447         rpc_count_iostats_metrics(task,
1448             &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1449 }
1450
1451 static void ff_layout_read_release(void *data)
1452 {
1453         struct nfs_pgio_header *hdr = data;
1454
1455         ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1456         if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1457                 ff_layout_resend_pnfs_read(hdr);
1458         else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1459                 ff_layout_reset_read(hdr);
1460         pnfs_generic_rw_release(data);
1461 }
1462
1463
1464 static int ff_layout_write_done_cb(struct rpc_task *task,
1465                                 struct nfs_pgio_header *hdr)
1466 {
1467         loff_t end_offs = 0;
1468         int err;
1469
1470         if (task->tk_status < 0) {
1471                 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1472                                             hdr->args.offset, hdr->args.count,
1473                                             &hdr->res.op_status, OP_WRITE,
1474                                             task->tk_status);
1475                 trace_ff_layout_write_error(hdr);
1476         }
1477
1478         err = ff_layout_async_handle_error(task, hdr->args.context->state,
1479                                            hdr->ds_clp, hdr->lseg,
1480                                            hdr->pgio_mirror_idx);
1481
1482         trace_nfs4_pnfs_write(hdr, err);
1483         clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1484         clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1485         switch (err) {
1486         case -NFS4ERR_RESET_TO_PNFS:
1487                 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1488                 return task->tk_status;
1489         case -NFS4ERR_RESET_TO_MDS:
1490                 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1491                 return task->tk_status;
1492         case -EAGAIN:
1493                 return -EAGAIN;
1494         }
1495
1496         if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1497             hdr->res.verf->committed == NFS_DATA_SYNC)
1498                 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1499
1500         /* Note: if the write is unstable, don't set end_offs until commit */
1501         ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1502
1503         /* zero out fattr since we don't care DS attr at all */
1504         hdr->fattr.valid = 0;
1505         if (task->tk_status >= 0)
1506                 nfs_writeback_update_inode(hdr);
1507
1508         return 0;
1509 }
1510
1511 static int ff_layout_commit_done_cb(struct rpc_task *task,
1512                                      struct nfs_commit_data *data)
1513 {
1514         int err;
1515
1516         if (task->tk_status < 0) {
1517                 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1518                                             data->args.offset, data->args.count,
1519                                             &data->res.op_status, OP_COMMIT,
1520                                             task->tk_status);
1521                 trace_ff_layout_commit_error(data);
1522         }
1523
1524         err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1525                                            data->lseg, data->ds_commit_index);
1526
1527         trace_nfs4_pnfs_commit_ds(data, err);
1528         switch (err) {
1529         case -NFS4ERR_RESET_TO_PNFS:
1530                 pnfs_generic_prepare_to_resend_writes(data);
1531                 return -EAGAIN;
1532         case -NFS4ERR_RESET_TO_MDS:
1533                 pnfs_generic_prepare_to_resend_writes(data);
1534                 return -EAGAIN;
1535         case -EAGAIN:
1536                 rpc_restart_call_prepare(task);
1537                 return -EAGAIN;
1538         }
1539
1540         ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1541
1542         return 0;
1543 }
1544
1545 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1546                 struct nfs_pgio_header *hdr)
1547 {
1548         if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1549                 return;
1550         nfs4_ff_layout_stat_io_start_write(hdr->inode,
1551                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1552                         hdr->args.count,
1553                         task->tk_start);
1554 }
1555
1556 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1557                 struct nfs_pgio_header *hdr)
1558 {
1559         if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1560                 return;
1561         nfs4_ff_layout_stat_io_end_write(task,
1562                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1563                         hdr->args.count, hdr->res.count,
1564                         hdr->res.verf->committed);
1565         set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1566 }
1567
1568 static int ff_layout_write_prepare_common(struct rpc_task *task,
1569                                           struct nfs_pgio_header *hdr)
1570 {
1571         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1572                 rpc_exit(task, -EIO);
1573                 return -EIO;
1574         }
1575
1576         if (!pnfs_is_valid_lseg(hdr->lseg)) {
1577                 rpc_exit(task, -EAGAIN);
1578                 return -EAGAIN;
1579         }
1580
1581         ff_layout_write_record_layoutstats_start(task, hdr);
1582         return 0;
1583 }
1584
1585 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1586 {
1587         struct nfs_pgio_header *hdr = data;
1588
1589         if (ff_layout_write_prepare_common(task, hdr))
1590                 return;
1591
1592         rpc_call_start(task);
1593 }
1594
1595 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1596 {
1597         struct nfs_pgio_header *hdr = data;
1598
1599         if (nfs4_setup_sequence(hdr->ds_clp,
1600                                 &hdr->args.seq_args,
1601                                 &hdr->res.seq_res,
1602                                 task))
1603                 return;
1604
1605         ff_layout_write_prepare_common(task, hdr);
1606 }
1607
1608 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1609 {
1610         struct nfs_pgio_header *hdr = data;
1611
1612         if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1613             task->tk_status == 0) {
1614                 nfs4_sequence_done(task, &hdr->res.seq_res);
1615                 return;
1616         }
1617
1618         /* Note this may cause RPC to be resent */
1619         hdr->mds_ops->rpc_call_done(task, hdr);
1620 }
1621
1622 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1623 {
1624         struct nfs_pgio_header *hdr = data;
1625
1626         ff_layout_write_record_layoutstats_done(task, hdr);
1627         rpc_count_iostats_metrics(task,
1628             &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1629 }
1630
1631 static void ff_layout_write_release(void *data)
1632 {
1633         struct nfs_pgio_header *hdr = data;
1634
1635         ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1636         if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1637                 ff_layout_send_layouterror(hdr->lseg);
1638                 ff_layout_reset_write(hdr, true);
1639         } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1640                 ff_layout_reset_write(hdr, false);
1641         pnfs_generic_rw_release(data);
1642 }
1643
1644 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1645                 struct nfs_commit_data *cdata)
1646 {
1647         if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1648                 return;
1649         nfs4_ff_layout_stat_io_start_write(cdata->inode,
1650                         FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1651                         0, task->tk_start);
1652 }
1653
1654 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1655                 struct nfs_commit_data *cdata)
1656 {
1657         struct nfs_page *req;
1658         __u64 count = 0;
1659
1660         if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1661                 return;
1662
1663         if (task->tk_status == 0) {
1664                 list_for_each_entry(req, &cdata->pages, wb_list)
1665                         count += req->wb_bytes;
1666         }
1667         nfs4_ff_layout_stat_io_end_write(task,
1668                         FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1669                         count, count, NFS_FILE_SYNC);
1670         set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
1671 }
1672
1673 static int ff_layout_commit_prepare_common(struct rpc_task *task,
1674                                            struct nfs_commit_data *cdata)
1675 {
1676         if (!pnfs_is_valid_lseg(cdata->lseg)) {
1677                 rpc_exit(task, -EAGAIN);
1678                 return -EAGAIN;
1679         }
1680
1681         ff_layout_commit_record_layoutstats_start(task, cdata);
1682         return 0;
1683 }
1684
1685 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1686 {
1687         if (ff_layout_commit_prepare_common(task, data))
1688                 return;
1689
1690         rpc_call_start(task);
1691 }
1692
1693 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1694 {
1695         struct nfs_commit_data *wdata = data;
1696
1697         if (nfs4_setup_sequence(wdata->ds_clp,
1698                                 &wdata->args.seq_args,
1699                                 &wdata->res.seq_res,
1700                                 task))
1701                 return;
1702         ff_layout_commit_prepare_common(task, data);
1703 }
1704
1705 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1706 {
1707         pnfs_generic_write_commit_done(task, data);
1708 }
1709
1710 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1711 {
1712         struct nfs_commit_data *cdata = data;
1713
1714         ff_layout_commit_record_layoutstats_done(task, cdata);
1715         rpc_count_iostats_metrics(task,
1716             &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1717 }
1718
1719 static void ff_layout_commit_release(void *data)
1720 {
1721         struct nfs_commit_data *cdata = data;
1722
1723         ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1724         pnfs_generic_commit_release(data);
1725 }
1726
1727 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1728         .rpc_call_prepare = ff_layout_read_prepare_v3,
1729         .rpc_call_done = ff_layout_read_call_done,
1730         .rpc_count_stats = ff_layout_read_count_stats,
1731         .rpc_release = ff_layout_read_release,
1732 };
1733
1734 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1735         .rpc_call_prepare = ff_layout_read_prepare_v4,
1736         .rpc_call_done = ff_layout_read_call_done,
1737         .rpc_count_stats = ff_layout_read_count_stats,
1738         .rpc_release = ff_layout_read_release,
1739 };
1740
1741 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1742         .rpc_call_prepare = ff_layout_write_prepare_v3,
1743         .rpc_call_done = ff_layout_write_call_done,
1744         .rpc_count_stats = ff_layout_write_count_stats,
1745         .rpc_release = ff_layout_write_release,
1746 };
1747
1748 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1749         .rpc_call_prepare = ff_layout_write_prepare_v4,
1750         .rpc_call_done = ff_layout_write_call_done,
1751         .rpc_count_stats = ff_layout_write_count_stats,
1752         .rpc_release = ff_layout_write_release,
1753 };
1754
1755 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1756         .rpc_call_prepare = ff_layout_commit_prepare_v3,
1757         .rpc_call_done = ff_layout_commit_done,
1758         .rpc_count_stats = ff_layout_commit_count_stats,
1759         .rpc_release = ff_layout_commit_release,
1760 };
1761
1762 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1763         .rpc_call_prepare = ff_layout_commit_prepare_v4,
1764         .rpc_call_done = ff_layout_commit_done,
1765         .rpc_count_stats = ff_layout_commit_count_stats,
1766         .rpc_release = ff_layout_commit_release,
1767 };
1768
1769 static enum pnfs_try_status
1770 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1771 {
1772         struct pnfs_layout_segment *lseg = hdr->lseg;
1773         struct nfs4_pnfs_ds *ds;
1774         struct rpc_clnt *ds_clnt;
1775         struct nfsd_file *localio;
1776         struct nfs4_ff_layout_mirror *mirror;
1777         const struct cred *ds_cred;
1778         loff_t offset = hdr->args.offset;
1779         u32 idx = hdr->pgio_mirror_idx;
1780         int vers;
1781         struct nfs_fh *fh;
1782
1783         dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1784                 __func__, hdr->inode->i_ino,
1785                 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1786
1787         mirror = FF_LAYOUT_COMP(lseg, idx);
1788         ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
1789         if (!ds)
1790                 goto out_failed;
1791
1792         ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1793                                                    hdr->inode);
1794         if (IS_ERR(ds_clnt))
1795                 goto out_failed;
1796
1797         ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1798         if (!ds_cred)
1799                 goto out_failed;
1800
1801         vers = nfs4_ff_layout_ds_version(mirror);
1802
1803         dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1804                 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
1805
1806         hdr->pgio_done_cb = ff_layout_read_done_cb;
1807         refcount_inc(&ds->ds_clp->cl_count);
1808         hdr->ds_clp = ds->ds_clp;
1809         fh = nfs4_ff_layout_select_ds_fh(mirror);
1810         if (fh)
1811                 hdr->args.fh = fh;
1812
1813         nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1814
1815         /*
1816          * Note that if we ever decide to split across DSes,
1817          * then we may need to handle dense-like offsets.
1818          */
1819         hdr->args.offset = offset;
1820         hdr->mds_offset = offset;
1821
1822         /* Start IO accounting for local read */
1823         localio = ff_local_open_fh(ds->ds_clp, ds_cred, fh, FMODE_READ);
1824         if (localio) {
1825                 hdr->task.tk_start = ktime_get();
1826                 ff_layout_read_record_layoutstats_start(&hdr->task, hdr);
1827         }
1828
1829         /* Perform an asynchronous read to ds */
1830         nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1831                           vers == 3 ? &ff_layout_read_call_ops_v3 :
1832                                       &ff_layout_read_call_ops_v4,
1833                           0, RPC_TASK_SOFTCONN, localio);
1834         put_cred(ds_cred);
1835         return PNFS_ATTEMPTED;
1836
1837 out_failed:
1838         if (ff_layout_avoid_mds_available_ds(lseg))
1839                 return PNFS_TRY_AGAIN;
1840         trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
1841                         hdr->args.offset, hdr->args.count,
1842                         IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
1843         return PNFS_NOT_ATTEMPTED;
1844 }
1845
1846 /* Perform async writes. */
1847 static enum pnfs_try_status
1848 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1849 {
1850         struct pnfs_layout_segment *lseg = hdr->lseg;
1851         struct nfs4_pnfs_ds *ds;
1852         struct rpc_clnt *ds_clnt;
1853         struct nfsd_file *localio;
1854         struct nfs4_ff_layout_mirror *mirror;
1855         const struct cred *ds_cred;
1856         loff_t offset = hdr->args.offset;
1857         int vers;
1858         struct nfs_fh *fh;
1859         u32 idx = hdr->pgio_mirror_idx;
1860
1861         mirror = FF_LAYOUT_COMP(lseg, idx);
1862         ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1863         if (!ds)
1864                 goto out_failed;
1865
1866         ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1867                                                    hdr->inode);
1868         if (IS_ERR(ds_clnt))
1869                 goto out_failed;
1870
1871         ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1872         if (!ds_cred)
1873                 goto out_failed;
1874
1875         vers = nfs4_ff_layout_ds_version(mirror);
1876
1877         dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1878                 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1879                 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
1880                 vers);
1881
1882         hdr->pgio_done_cb = ff_layout_write_done_cb;
1883         refcount_inc(&ds->ds_clp->cl_count);
1884         hdr->ds_clp = ds->ds_clp;
1885         hdr->ds_commit_idx = idx;
1886         fh = nfs4_ff_layout_select_ds_fh(mirror);
1887         if (fh)
1888                 hdr->args.fh = fh;
1889
1890         nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1891
1892         /*
1893          * Note that if we ever decide to split across DSes,
1894          * then we may need to handle dense-like offsets.
1895          */
1896         hdr->args.offset = offset;
1897
1898         /* Start IO accounting for local write */
1899         localio = ff_local_open_fh(ds->ds_clp, ds_cred, fh,
1900                                    FMODE_READ|FMODE_WRITE);
1901         if (localio) {
1902                 hdr->task.tk_start = ktime_get();
1903                 ff_layout_write_record_layoutstats_start(&hdr->task, hdr);
1904         }
1905
1906         /* Perform an asynchronous write */
1907         nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1908                           vers == 3 ? &ff_layout_write_call_ops_v3 :
1909                                       &ff_layout_write_call_ops_v4,
1910                           sync, RPC_TASK_SOFTCONN, localio);
1911         put_cred(ds_cred);
1912         return PNFS_ATTEMPTED;
1913
1914 out_failed:
1915         if (ff_layout_avoid_mds_available_ds(lseg))
1916                 return PNFS_TRY_AGAIN;
1917         trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
1918                         hdr->args.offset, hdr->args.count,
1919                         IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
1920         return PNFS_NOT_ATTEMPTED;
1921 }
1922
1923 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1924 {
1925         return i;
1926 }
1927
1928 static struct nfs_fh *
1929 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1930 {
1931         struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1932
1933         /* FIXME: Assume that there is only one NFS version available
1934          * for the DS.
1935          */
1936         return &flseg->mirror_array[i]->fh_versions[0];
1937 }
1938
1939 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1940 {
1941         struct pnfs_layout_segment *lseg = data->lseg;
1942         struct nfs4_pnfs_ds *ds;
1943         struct rpc_clnt *ds_clnt;
1944         struct nfsd_file *localio;
1945         struct nfs4_ff_layout_mirror *mirror;
1946         const struct cred *ds_cred;
1947         u32 idx;
1948         int vers, ret;
1949         struct nfs_fh *fh;
1950
1951         if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1952             test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1953                 goto out_err;
1954
1955         idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1956         mirror = FF_LAYOUT_COMP(lseg, idx);
1957         ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1958         if (!ds)
1959                 goto out_err;
1960
1961         ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1962                                                    data->inode);
1963         if (IS_ERR(ds_clnt))
1964                 goto out_err;
1965
1966         ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
1967         if (!ds_cred)
1968                 goto out_err;
1969
1970         vers = nfs4_ff_layout_ds_version(mirror);
1971
1972         dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1973                 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
1974                 vers);
1975         data->commit_done_cb = ff_layout_commit_done_cb;
1976         data->cred = ds_cred;
1977         refcount_inc(&ds->ds_clp->cl_count);
1978         data->ds_clp = ds->ds_clp;
1979         fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1980         if (fh)
1981                 data->args.fh = fh;
1982
1983         /* Start IO accounting for local commit */
1984         localio = ff_local_open_fh(ds->ds_clp, ds_cred, fh,
1985                                    FMODE_READ|FMODE_WRITE);
1986         if (localio) {
1987                 data->task.tk_start = ktime_get();
1988                 ff_layout_commit_record_layoutstats_start(&data->task, data);
1989         }
1990
1991         ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1992                                    vers == 3 ? &ff_layout_commit_call_ops_v3 :
1993                                                &ff_layout_commit_call_ops_v4,
1994                                    how, RPC_TASK_SOFTCONN, localio);
1995         put_cred(ds_cred);
1996         return ret;
1997 out_err:
1998         pnfs_generic_prepare_to_resend_writes(data);
1999         pnfs_generic_commit_release(data);
2000         return -EAGAIN;
2001 }
2002
2003 static int
2004 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
2005                            int how, struct nfs_commit_info *cinfo)
2006 {
2007         return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
2008                                             ff_layout_initiate_commit);
2009 }
2010
2011 static bool ff_layout_match_rw(const struct rpc_task *task,
2012                                const struct nfs_pgio_header *hdr,
2013                                const struct pnfs_layout_segment *lseg)
2014 {
2015         return hdr->lseg == lseg;
2016 }
2017
2018 static bool ff_layout_match_commit(const struct rpc_task *task,
2019                                    const struct nfs_commit_data *cdata,
2020                                    const struct pnfs_layout_segment *lseg)
2021 {
2022         return cdata->lseg == lseg;
2023 }
2024
2025 static bool ff_layout_match_io(const struct rpc_task *task, const void *data)
2026 {
2027         const struct rpc_call_ops *ops = task->tk_ops;
2028
2029         if (ops == &ff_layout_read_call_ops_v3 ||
2030             ops == &ff_layout_read_call_ops_v4 ||
2031             ops == &ff_layout_write_call_ops_v3 ||
2032             ops == &ff_layout_write_call_ops_v4)
2033                 return ff_layout_match_rw(task, task->tk_calldata, data);
2034         if (ops == &ff_layout_commit_call_ops_v3 ||
2035             ops == &ff_layout_commit_call_ops_v4)
2036                 return ff_layout_match_commit(task, task->tk_calldata, data);
2037         return false;
2038 }
2039
2040 static void ff_layout_cancel_io(struct pnfs_layout_segment *lseg)
2041 {
2042         struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
2043         struct nfs4_ff_layout_mirror *mirror;
2044         struct nfs4_ff_layout_ds *mirror_ds;
2045         struct nfs4_pnfs_ds *ds;
2046         struct nfs_client *ds_clp;
2047         struct rpc_clnt *clnt;
2048         u32 idx;
2049
2050         for (idx = 0; idx < flseg->mirror_array_cnt; idx++) {
2051                 mirror = flseg->mirror_array[idx];
2052                 mirror_ds = mirror->mirror_ds;
2053                 if (IS_ERR_OR_NULL(mirror_ds))
2054                         continue;
2055                 ds = mirror->mirror_ds->ds;
2056                 if (!ds)
2057                         continue;
2058                 ds_clp = ds->ds_clp;
2059                 if (!ds_clp)
2060                         continue;
2061                 clnt = ds_clp->cl_rpcclient;
2062                 if (!clnt)
2063                         continue;
2064                 if (!rpc_cancel_tasks(clnt, -EAGAIN, ff_layout_match_io, lseg))
2065                         continue;
2066                 rpc_clnt_disconnect(clnt);
2067         }
2068 }
2069
2070 static struct pnfs_ds_commit_info *
2071 ff_layout_get_ds_info(struct inode *inode)
2072 {
2073         struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
2074
2075         if (layout == NULL)
2076                 return NULL;
2077
2078         return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
2079 }
2080
2081 static void
2082 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
2083                 struct pnfs_layout_segment *lseg)
2084 {
2085         struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
2086         struct inode *inode = lseg->pls_layout->plh_inode;
2087         struct pnfs_commit_array *array, *new;
2088
2089         new = pnfs_alloc_commit_array(flseg->mirror_array_cnt,
2090                                       nfs_io_gfp_mask());
2091         if (new) {
2092                 spin_lock(&inode->i_lock);
2093                 array = pnfs_add_commit_array(fl_cinfo, new, lseg);
2094                 spin_unlock(&inode->i_lock);
2095                 if (array != new)
2096                         pnfs_free_commit_array(new);
2097         }
2098 }
2099
2100 static void
2101 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
2102                 struct inode *inode)
2103 {
2104         spin_lock(&inode->i_lock);
2105         pnfs_generic_ds_cinfo_destroy(fl_cinfo);
2106         spin_unlock(&inode->i_lock);
2107 }
2108
2109 static void
2110 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
2111 {
2112         nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
2113                                                   id_node));
2114 }
2115
2116 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
2117                                   const struct nfs4_layoutreturn_args *args,
2118                                   const struct nfs4_flexfile_layoutreturn_args *ff_args)
2119 {
2120         __be32 *start;
2121
2122         start = xdr_reserve_space(xdr, 4);
2123         if (unlikely(!start))
2124                 return -E2BIG;
2125
2126         *start = cpu_to_be32(ff_args->num_errors);
2127         /* This assume we always return _ALL_ layouts */
2128         return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
2129 }
2130
2131 static void
2132 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2133                             const nfs4_stateid *stateid,
2134                             const struct nfs42_layoutstat_devinfo *devinfo)
2135 {
2136         __be32 *p;
2137
2138         p = xdr_reserve_space(xdr, 8 + 8);
2139         p = xdr_encode_hyper(p, devinfo->offset);
2140         p = xdr_encode_hyper(p, devinfo->length);
2141         encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2142         p = xdr_reserve_space(xdr, 4*8);
2143         p = xdr_encode_hyper(p, devinfo->read_count);
2144         p = xdr_encode_hyper(p, devinfo->read_bytes);
2145         p = xdr_encode_hyper(p, devinfo->write_count);
2146         p = xdr_encode_hyper(p, devinfo->write_bytes);
2147         encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2148 }
2149
2150 static void
2151 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2152                             const nfs4_stateid *stateid,
2153                             const struct nfs42_layoutstat_devinfo *devinfo)
2154 {
2155         ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2156         ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2157                         devinfo->ld_private.data);
2158 }
2159
2160 /* report nothing for now */
2161 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2162                 const struct nfs4_layoutreturn_args *args,
2163                 struct nfs4_flexfile_layoutreturn_args *ff_args)
2164 {
2165         __be32 *p;
2166         int i;
2167
2168         p = xdr_reserve_space(xdr, 4);
2169         *p = cpu_to_be32(ff_args->num_dev);
2170         for (i = 0; i < ff_args->num_dev; i++)
2171                 ff_layout_encode_ff_iostat(xdr,
2172                                 &args->layout->plh_stateid,
2173                                 &ff_args->devinfo[i]);
2174 }
2175
2176 static void
2177 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2178                 unsigned int num_entries)
2179 {
2180         unsigned int i;
2181
2182         for (i = 0; i < num_entries; i++) {
2183                 if (!devinfo[i].ld_private.ops)
2184                         continue;
2185                 if (!devinfo[i].ld_private.ops->free)
2186                         continue;
2187                 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2188         }
2189 }
2190
2191 static struct nfs4_deviceid_node *
2192 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2193                               struct pnfs_device *pdev, gfp_t gfp_flags)
2194 {
2195         struct nfs4_ff_layout_ds *dsaddr;
2196
2197         dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2198         if (!dsaddr)
2199                 return NULL;
2200         return &dsaddr->id_node;
2201 }
2202
2203 static void
2204 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2205                 const void *voidargs,
2206                 const struct nfs4_xdr_opaque_data *ff_opaque)
2207 {
2208         const struct nfs4_layoutreturn_args *args = voidargs;
2209         struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2210         struct xdr_buf tmp_buf = {
2211                 .head = {
2212                         [0] = {
2213                                 .iov_base = page_address(ff_args->pages[0]),
2214                         },
2215                 },
2216                 .buflen = PAGE_SIZE,
2217         };
2218         struct xdr_stream tmp_xdr;
2219         __be32 *start;
2220
2221         dprintk("%s: Begin\n", __func__);
2222
2223         xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
2224
2225         ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2226         ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2227
2228         start = xdr_reserve_space(xdr, 4);
2229         *start = cpu_to_be32(tmp_buf.len);
2230         xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2231
2232         dprintk("%s: Return\n", __func__);
2233 }
2234
2235 static void
2236 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2237 {
2238         struct nfs4_flexfile_layoutreturn_args *ff_args;
2239
2240         if (!args->data)
2241                 return;
2242         ff_args = args->data;
2243         args->data = NULL;
2244
2245         ff_layout_free_ds_ioerr(&ff_args->errors);
2246         ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2247
2248         put_page(ff_args->pages[0]);
2249         kfree(ff_args);
2250 }
2251
2252 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2253         .encode = ff_layout_encode_layoutreturn,
2254         .free = ff_layout_free_layoutreturn,
2255 };
2256
2257 static int
2258 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2259 {
2260         struct nfs4_flexfile_layoutreturn_args *ff_args;
2261         struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2262
2263         ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask());
2264         if (!ff_args)
2265                 goto out_nomem;
2266         ff_args->pages[0] = alloc_page(nfs_io_gfp_mask());
2267         if (!ff_args->pages[0])
2268                 goto out_nomem_free;
2269
2270         INIT_LIST_HEAD(&ff_args->errors);
2271         ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2272                         &args->range, &ff_args->errors,
2273                         FF_LAYOUTRETURN_MAXERR);
2274
2275         spin_lock(&args->inode->i_lock);
2276         ff_args->num_dev = ff_layout_mirror_prepare_stats(
2277                 &ff_layout->generic_hdr, &ff_args->devinfo[0],
2278                 ARRAY_SIZE(ff_args->devinfo), NFS4_FF_OP_LAYOUTRETURN);
2279         spin_unlock(&args->inode->i_lock);
2280
2281         args->ld_private->ops = &layoutreturn_ops;
2282         args->ld_private->data = ff_args;
2283         return 0;
2284 out_nomem_free:
2285         kfree(ff_args);
2286 out_nomem:
2287         return -ENOMEM;
2288 }
2289
2290 #ifdef CONFIG_NFS_V4_2
2291 void
2292 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2293 {
2294         struct pnfs_layout_hdr *lo = lseg->pls_layout;
2295         struct nfs42_layout_error *errors;
2296         LIST_HEAD(head);
2297
2298         if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2299                 return;
2300         ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2301         if (list_empty(&head))
2302                 return;
2303
2304         errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors),
2305                                nfs_io_gfp_mask());
2306         if (errors != NULL) {
2307                 const struct nfs4_ff_layout_ds_err *pos;
2308                 size_t n = 0;
2309
2310                 list_for_each_entry(pos, &head, list) {
2311                         errors[n].offset = pos->offset;
2312                         errors[n].length = pos->length;
2313                         nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2314                         errors[n].errors[0].dev_id = pos->deviceid;
2315                         errors[n].errors[0].status = pos->status;
2316                         errors[n].errors[0].opnum = pos->opnum;
2317                         n++;
2318                         if (!list_is_last(&pos->list, &head) &&
2319                             n < NFS42_LAYOUTERROR_MAX)
2320                                 continue;
2321                         if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2322                                 break;
2323                         n = 0;
2324                 }
2325                 kfree(errors);
2326         }
2327         ff_layout_free_ds_ioerr(&head);
2328 }
2329 #else
2330 void
2331 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2332 {
2333 }
2334 #endif
2335
2336 static int
2337 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2338 {
2339         const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2340
2341         return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2342 }
2343
2344 static size_t
2345 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2346                           const int buflen)
2347 {
2348         const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2349         const struct in6_addr *addr = &sin6->sin6_addr;
2350
2351         /*
2352          * RFC 4291, Section 2.2.2
2353          *
2354          * Shorthanded ANY address
2355          */
2356         if (ipv6_addr_any(addr))
2357                 return snprintf(buf, buflen, "::");
2358
2359         /*
2360          * RFC 4291, Section 2.2.2
2361          *
2362          * Shorthanded loopback address
2363          */
2364         if (ipv6_addr_loopback(addr))
2365                 return snprintf(buf, buflen, "::1");
2366
2367         /*
2368          * RFC 4291, Section 2.2.3
2369          *
2370          * Special presentation address format for mapped v4
2371          * addresses.
2372          */
2373         if (ipv6_addr_v4mapped(addr))
2374                 return snprintf(buf, buflen, "::ffff:%pI4",
2375                                         &addr->s6_addr32[3]);
2376
2377         /*
2378          * RFC 4291, Section 2.2.1
2379          */
2380         return snprintf(buf, buflen, "%pI6c", addr);
2381 }
2382
2383 /* Derived from rpc_sockaddr2uaddr */
2384 static void
2385 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2386 {
2387         struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2388         char portbuf[RPCBIND_MAXUADDRPLEN];
2389         char addrbuf[RPCBIND_MAXUADDRLEN];
2390         unsigned short port;
2391         int len, netid_len;
2392         __be32 *p;
2393
2394         switch (sap->sa_family) {
2395         case AF_INET:
2396                 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2397                         return;
2398                 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2399                 break;
2400         case AF_INET6:
2401                 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2402                         return;
2403                 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2404                 break;
2405         default:
2406                 WARN_ON_ONCE(1);
2407                 return;
2408         }
2409
2410         snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2411         len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2412
2413         netid_len = strlen(da->da_netid);
2414         p = xdr_reserve_space(xdr, 4 + netid_len);
2415         xdr_encode_opaque(p, da->da_netid, netid_len);
2416
2417         p = xdr_reserve_space(xdr, 4 + len);
2418         xdr_encode_opaque(p, addrbuf, len);
2419 }
2420
2421 static void
2422 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2423                          ktime_t t)
2424 {
2425         struct timespec64 ts;
2426         __be32 *p;
2427
2428         p = xdr_reserve_space(xdr, 12);
2429         ts = ktime_to_timespec64(t);
2430         p = xdr_encode_hyper(p, ts.tv_sec);
2431         *p++ = cpu_to_be32(ts.tv_nsec);
2432 }
2433
2434 static void
2435 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2436                             struct nfs4_ff_io_stat *stat)
2437 {
2438         __be32 *p;
2439
2440         p = xdr_reserve_space(xdr, 5 * 8);
2441         p = xdr_encode_hyper(p, stat->ops_requested);
2442         p = xdr_encode_hyper(p, stat->bytes_requested);
2443         p = xdr_encode_hyper(p, stat->ops_completed);
2444         p = xdr_encode_hyper(p, stat->bytes_completed);
2445         p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2446         ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2447         ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2448 }
2449
2450 static void
2451 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2452                               const struct nfs42_layoutstat_devinfo *devinfo,
2453                               struct nfs4_ff_layout_mirror *mirror)
2454 {
2455         struct nfs4_pnfs_ds_addr *da;
2456         struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2457         struct nfs_fh *fh = &mirror->fh_versions[0];
2458         __be32 *p;
2459
2460         da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2461         dprintk("%s: DS %s: encoding address %s\n",
2462                 __func__, ds->ds_remotestr, da->da_remotestr);
2463         /* netaddr4 */
2464         ff_layout_encode_netaddr(xdr, da);
2465         /* nfs_fh4 */
2466         p = xdr_reserve_space(xdr, 4 + fh->size);
2467         xdr_encode_opaque(p, fh->data, fh->size);
2468         /* ff_io_latency4 read */
2469         spin_lock(&mirror->lock);
2470         ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2471         /* ff_io_latency4 write */
2472         ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2473         spin_unlock(&mirror->lock);
2474         /* nfstime4 */
2475         ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2476         /* bool */
2477         p = xdr_reserve_space(xdr, 4);
2478         *p = cpu_to_be32(false);
2479 }
2480
2481 static void
2482 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2483                              const struct nfs4_xdr_opaque_data *opaque)
2484 {
2485         struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2486                         struct nfs42_layoutstat_devinfo, ld_private);
2487         __be32 *start;
2488
2489         /* layoutupdate length */
2490         start = xdr_reserve_space(xdr, 4);
2491         ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2492
2493         *start = cpu_to_be32((xdr->p - start - 1) * 4);
2494 }
2495
2496 static void
2497 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2498 {
2499         struct nfs4_ff_layout_mirror *mirror = opaque->data;
2500
2501         ff_layout_put_mirror(mirror);
2502 }
2503
2504 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2505         .encode = ff_layout_encode_layoutstats,
2506         .free   = ff_layout_free_layoutstats,
2507 };
2508
2509 static int
2510 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2511                                struct nfs42_layoutstat_devinfo *devinfo,
2512                                int dev_limit, enum nfs4_ff_op_type type)
2513 {
2514         struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2515         struct nfs4_ff_layout_mirror *mirror;
2516         struct nfs4_deviceid_node *dev;
2517         int i = 0;
2518
2519         list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2520                 if (i >= dev_limit)
2521                         break;
2522                 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2523                         continue;
2524                 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL,
2525                                         &mirror->flags) &&
2526                     type != NFS4_FF_OP_LAYOUTRETURN)
2527                         continue;
2528                 /* mirror refcount put in cleanup_layoutstats */
2529                 if (!refcount_inc_not_zero(&mirror->ref))
2530                         continue;
2531                 dev = &mirror->mirror_ds->id_node;
2532                 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2533                 devinfo->offset = 0;
2534                 devinfo->length = NFS4_MAX_UINT64;
2535                 spin_lock(&mirror->lock);
2536                 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2537                 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2538                 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2539                 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2540                 spin_unlock(&mirror->lock);
2541                 devinfo->layout_type = LAYOUT_FLEX_FILES;
2542                 devinfo->ld_private.ops = &layoutstat_ops;
2543                 devinfo->ld_private.data = mirror;
2544
2545                 devinfo++;
2546                 i++;
2547         }
2548         return i;
2549 }
2550
2551 static int ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2552 {
2553         struct pnfs_layout_hdr *lo;
2554         struct nfs4_flexfile_layout *ff_layout;
2555         const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2556
2557         /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2558         args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo),
2559                                       nfs_io_gfp_mask());
2560         if (!args->devinfo)
2561                 return -ENOMEM;
2562
2563         spin_lock(&args->inode->i_lock);
2564         lo = NFS_I(args->inode)->layout;
2565         if (lo && pnfs_layout_is_valid(lo)) {
2566                 ff_layout = FF_LAYOUT_FROM_HDR(lo);
2567                 args->num_dev = ff_layout_mirror_prepare_stats(
2568                         &ff_layout->generic_hdr, &args->devinfo[0], dev_count,
2569                         NFS4_FF_OP_LAYOUTSTATS);
2570         } else
2571                 args->num_dev = 0;
2572         spin_unlock(&args->inode->i_lock);
2573         if (!args->num_dev) {
2574                 kfree(args->devinfo);
2575                 args->devinfo = NULL;
2576                 return -ENOENT;
2577         }
2578
2579         return 0;
2580 }
2581
2582 static int
2583 ff_layout_set_layoutdriver(struct nfs_server *server,
2584                 const struct nfs_fh *dummy)
2585 {
2586 #if IS_ENABLED(CONFIG_NFS_V4_2)
2587         server->caps |= NFS_CAP_LAYOUTSTATS | NFS_CAP_REBOOT_LAYOUTRETURN;
2588 #endif
2589         return 0;
2590 }
2591
2592 static const struct pnfs_commit_ops ff_layout_commit_ops = {
2593         .setup_ds_info          = ff_layout_setup_ds_info,
2594         .release_ds_info        = ff_layout_release_ds_info,
2595         .mark_request_commit    = pnfs_layout_mark_request_commit,
2596         .clear_request_commit   = pnfs_generic_clear_request_commit,
2597         .scan_commit_lists      = pnfs_generic_scan_commit_lists,
2598         .recover_commit_reqs    = pnfs_generic_recover_commit_reqs,
2599         .commit_pagelist        = ff_layout_commit_pagelist,
2600 };
2601
2602 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2603         .id                     = LAYOUT_FLEX_FILES,
2604         .name                   = "LAYOUT_FLEX_FILES",
2605         .owner                  = THIS_MODULE,
2606         .flags                  = PNFS_LAYOUTGET_ON_OPEN,
2607         .max_layoutget_response = 4096, /* 1 page or so... */
2608         .set_layoutdriver       = ff_layout_set_layoutdriver,
2609         .alloc_layout_hdr       = ff_layout_alloc_layout_hdr,
2610         .free_layout_hdr        = ff_layout_free_layout_hdr,
2611         .alloc_lseg             = ff_layout_alloc_lseg,
2612         .free_lseg              = ff_layout_free_lseg,
2613         .add_lseg               = ff_layout_add_lseg,
2614         .pg_read_ops            = &ff_layout_pg_read_ops,
2615         .pg_write_ops           = &ff_layout_pg_write_ops,
2616         .get_ds_info            = ff_layout_get_ds_info,
2617         .free_deviceid_node     = ff_layout_free_deviceid_node,
2618         .read_pagelist          = ff_layout_read_pagelist,
2619         .write_pagelist         = ff_layout_write_pagelist,
2620         .alloc_deviceid_node    = ff_layout_alloc_deviceid_node,
2621         .prepare_layoutreturn   = ff_layout_prepare_layoutreturn,
2622         .sync                   = pnfs_nfs_generic_sync,
2623         .prepare_layoutstats    = ff_layout_prepare_layoutstats,
2624         .cancel_io              = ff_layout_cancel_io,
2625 };
2626
2627 static int __init nfs4flexfilelayout_init(void)
2628 {
2629         printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2630                __func__);
2631         return pnfs_register_layoutdriver(&flexfilelayout_type);
2632 }
2633
2634 static void __exit nfs4flexfilelayout_exit(void)
2635 {
2636         printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2637                __func__);
2638         pnfs_unregister_layoutdriver(&flexfilelayout_type);
2639 }
2640
2641 MODULE_ALIAS("nfs-layouttype4-4");
2642
2643 MODULE_LICENSE("GPL");
2644 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2645
2646 module_init(nfs4flexfilelayout_init);
2647 module_exit(nfs4flexfilelayout_exit);
2648
2649 module_param(io_maxretrans, ushort, 0644);
2650 MODULE_PARM_DESC(io_maxretrans, "The  number of times the NFSv4.1 client "
2651                         "retries an I/O request before returning an error. ");