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TOMOYO Linux Cross Reference
Linux/fs/nfs/flexfilelayout/flexfilelayout.c

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  1 /*
  2  * Module for pnfs flexfile layout driver.
  3  *
  4  * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
  5  *
  6  * Tao Peng <bergwolf@primarydata.com>
  7  */
  8 
  9 #include <linux/nfs_fs.h>
 10 #include <linux/nfs_page.h>
 11 #include <linux/module.h>
 12 
 13 #include <linux/sunrpc/metrics.h>
 14 
 15 #include "flexfilelayout.h"
 16 #include "../nfs4session.h"
 17 #include "../nfs4idmap.h"
 18 #include "../internal.h"
 19 #include "../delegation.h"
 20 #include "../nfs4trace.h"
 21 #include "../iostat.h"
 22 #include "../nfs.h"
 23 #include "../nfs42.h"
 24 
 25 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
 26 
 27 #define FF_LAYOUT_POLL_RETRY_MAX     (15*HZ)
 28 #define FF_LAYOUTRETURN_MAXERR 20
 29 
 30 
 31 static struct group_info        *ff_zero_group;
 32 
 33 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
 34                 struct nfs_pgio_header *hdr);
 35 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
 36                                struct nfs42_layoutstat_devinfo *devinfo,
 37                                int dev_limit);
 38 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
 39                               const struct nfs42_layoutstat_devinfo *devinfo,
 40                               struct nfs4_ff_layout_mirror *mirror);
 41 
 42 static struct pnfs_layout_hdr *
 43 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
 44 {
 45         struct nfs4_flexfile_layout *ffl;
 46 
 47         ffl = kzalloc(sizeof(*ffl), gfp_flags);
 48         if (ffl) {
 49                 INIT_LIST_HEAD(&ffl->error_list);
 50                 INIT_LIST_HEAD(&ffl->mirrors);
 51                 ffl->last_report_time = ktime_get();
 52                 return &ffl->generic_hdr;
 53         } else
 54                 return NULL;
 55 }
 56 
 57 static void
 58 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
 59 {
 60         struct nfs4_ff_layout_ds_err *err, *n;
 61 
 62         list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
 63                                  list) {
 64                 list_del(&err->list);
 65                 kfree(err);
 66         }
 67         kfree(FF_LAYOUT_FROM_HDR(lo));
 68 }
 69 
 70 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
 71 {
 72         __be32 *p;
 73 
 74         p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
 75         if (unlikely(p == NULL))
 76                 return -ENOBUFS;
 77         stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
 78         memcpy(stateid->data, p, NFS4_STATEID_SIZE);
 79         dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
 80                 p[0], p[1], p[2], p[3]);
 81         return 0;
 82 }
 83 
 84 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
 85 {
 86         __be32 *p;
 87 
 88         p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
 89         if (unlikely(!p))
 90                 return -ENOBUFS;
 91         memcpy(devid, p, NFS4_DEVICEID4_SIZE);
 92         nfs4_print_deviceid(devid);
 93         return 0;
 94 }
 95 
 96 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
 97 {
 98         __be32 *p;
 99 
100         p = xdr_inline_decode(xdr, 4);
101         if (unlikely(!p))
102                 return -ENOBUFS;
103         fh->size = be32_to_cpup(p++);
104         if (fh->size > sizeof(struct nfs_fh)) {
105                 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
106                        fh->size);
107                 return -EOVERFLOW;
108         }
109         /* fh.data */
110         p = xdr_inline_decode(xdr, fh->size);
111         if (unlikely(!p))
112                 return -ENOBUFS;
113         memcpy(&fh->data, p, fh->size);
114         dprintk("%s: fh len %d\n", __func__, fh->size);
115 
116         return 0;
117 }
118 
119 /*
120  * Currently only stringified uids and gids are accepted.
121  * I.e., kerberos is not supported to the DSes, so no pricipals.
122  *
123  * That means that one common function will suffice, but when
124  * principals are added, this should be split to accomodate
125  * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
126  */
127 static int
128 decode_name(struct xdr_stream *xdr, u32 *id)
129 {
130         __be32 *p;
131         int len;
132 
133         /* opaque_length(4)*/
134         p = xdr_inline_decode(xdr, 4);
135         if (unlikely(!p))
136                 return -ENOBUFS;
137         len = be32_to_cpup(p++);
138         if (len < 0)
139                 return -EINVAL;
140 
141         dprintk("%s: len %u\n", __func__, len);
142 
143         /* opaque body */
144         p = xdr_inline_decode(xdr, len);
145         if (unlikely(!p))
146                 return -ENOBUFS;
147 
148         if (!nfs_map_string_to_numeric((char *)p, len, id))
149                 return -EINVAL;
150 
151         return 0;
152 }
153 
154 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
155                 const struct nfs4_ff_layout_mirror *m2)
156 {
157         int i, j;
158 
159         if (m1->fh_versions_cnt != m2->fh_versions_cnt)
160                 return false;
161         for (i = 0; i < m1->fh_versions_cnt; i++) {
162                 bool found_fh = false;
163                 for (j = 0; j < m2->fh_versions_cnt; j++) {
164                         if (nfs_compare_fh(&m1->fh_versions[i],
165                                         &m2->fh_versions[j]) == 0) {
166                                 found_fh = true;
167                                 break;
168                         }
169                 }
170                 if (!found_fh)
171                         return false;
172         }
173         return true;
174 }
175 
176 static struct nfs4_ff_layout_mirror *
177 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
178                 struct nfs4_ff_layout_mirror *mirror)
179 {
180         struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
181         struct nfs4_ff_layout_mirror *pos;
182         struct inode *inode = lo->plh_inode;
183 
184         spin_lock(&inode->i_lock);
185         list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
186                 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
187                         continue;
188                 if (!ff_mirror_match_fh(mirror, pos))
189                         continue;
190                 if (atomic_inc_not_zero(&pos->ref)) {
191                         spin_unlock(&inode->i_lock);
192                         return pos;
193                 }
194         }
195         list_add(&mirror->mirrors, &ff_layout->mirrors);
196         mirror->layout = lo;
197         spin_unlock(&inode->i_lock);
198         return mirror;
199 }
200 
201 static void
202 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
203 {
204         struct inode *inode;
205         if (mirror->layout == NULL)
206                 return;
207         inode = mirror->layout->plh_inode;
208         spin_lock(&inode->i_lock);
209         list_del(&mirror->mirrors);
210         spin_unlock(&inode->i_lock);
211         mirror->layout = NULL;
212 }
213 
214 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
215 {
216         struct nfs4_ff_layout_mirror *mirror;
217 
218         mirror = kzalloc(sizeof(*mirror), gfp_flags);
219         if (mirror != NULL) {
220                 spin_lock_init(&mirror->lock);
221                 atomic_set(&mirror->ref, 1);
222                 INIT_LIST_HEAD(&mirror->mirrors);
223         }
224         return mirror;
225 }
226 
227 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
228 {
229         struct rpc_cred *cred;
230 
231         ff_layout_remove_mirror(mirror);
232         kfree(mirror->fh_versions);
233         cred = rcu_access_pointer(mirror->ro_cred);
234         if (cred)
235                 put_rpccred(cred);
236         cred = rcu_access_pointer(mirror->rw_cred);
237         if (cred)
238                 put_rpccred(cred);
239         nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
240         kfree(mirror);
241 }
242 
243 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
244 {
245         if (mirror != NULL && atomic_dec_and_test(&mirror->ref))
246                 ff_layout_free_mirror(mirror);
247 }
248 
249 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
250 {
251         int i;
252 
253         if (fls->mirror_array) {
254                 for (i = 0; i < fls->mirror_array_cnt; i++) {
255                         /* normally mirror_ds is freed in
256                          * .free_deviceid_node but we still do it here
257                          * for .alloc_lseg error path */
258                         ff_layout_put_mirror(fls->mirror_array[i]);
259                 }
260                 kfree(fls->mirror_array);
261                 fls->mirror_array = NULL;
262         }
263 }
264 
265 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
266 {
267         int ret = 0;
268 
269         dprintk("--> %s\n", __func__);
270 
271         /* FIXME: remove this check when layout segment support is added */
272         if (lgr->range.offset != 0 ||
273             lgr->range.length != NFS4_MAX_UINT64) {
274                 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
275                         __func__);
276                 ret = -EINVAL;
277         }
278 
279         dprintk("--> %s returns %d\n", __func__, ret);
280         return ret;
281 }
282 
283 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
284 {
285         if (fls) {
286                 ff_layout_free_mirror_array(fls);
287                 kfree(fls);
288         }
289 }
290 
291 static bool
292 ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
293                 const struct pnfs_layout_range *l2)
294 {
295         u64 end1, end2;
296 
297         if (l1->iomode != l2->iomode)
298                 return l1->iomode != IOMODE_READ;
299         end1 = pnfs_calc_offset_end(l1->offset, l1->length);
300         end2 = pnfs_calc_offset_end(l2->offset, l2->length);
301         if (end1 < l2->offset)
302                 return false;
303         if (end2 < l1->offset)
304                 return true;
305         return l2->offset <= l1->offset;
306 }
307 
308 static bool
309 ff_lseg_merge(struct pnfs_layout_segment *new,
310                 struct pnfs_layout_segment *old)
311 {
312         u64 new_end, old_end;
313 
314         if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
315                 return false;
316         if (new->pls_range.iomode != old->pls_range.iomode)
317                 return false;
318         old_end = pnfs_calc_offset_end(old->pls_range.offset,
319                         old->pls_range.length);
320         if (old_end < new->pls_range.offset)
321                 return false;
322         new_end = pnfs_calc_offset_end(new->pls_range.offset,
323                         new->pls_range.length);
324         if (new_end < old->pls_range.offset)
325                 return false;
326 
327         /* Mergeable: copy info from 'old' to 'new' */
328         if (new_end < old_end)
329                 new_end = old_end;
330         if (new->pls_range.offset < old->pls_range.offset)
331                 new->pls_range.offset = old->pls_range.offset;
332         new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
333                         new_end);
334         if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
335                 set_bit(NFS_LSEG_ROC, &new->pls_flags);
336         return true;
337 }
338 
339 static void
340 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
341                 struct pnfs_layout_segment *lseg,
342                 struct list_head *free_me)
343 {
344         pnfs_generic_layout_insert_lseg(lo, lseg,
345                         ff_lseg_range_is_after,
346                         ff_lseg_merge,
347                         free_me);
348 }
349 
350 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
351 {
352         int i, j;
353 
354         for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
355                 for (j = i + 1; j < fls->mirror_array_cnt; j++)
356                         if (fls->mirror_array[i]->efficiency <
357                             fls->mirror_array[j]->efficiency)
358                                 swap(fls->mirror_array[i],
359                                      fls->mirror_array[j]);
360         }
361 }
362 
363 static struct pnfs_layout_segment *
364 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
365                      struct nfs4_layoutget_res *lgr,
366                      gfp_t gfp_flags)
367 {
368         struct pnfs_layout_segment *ret;
369         struct nfs4_ff_layout_segment *fls = NULL;
370         struct xdr_stream stream;
371         struct xdr_buf buf;
372         struct page *scratch;
373         u64 stripe_unit;
374         u32 mirror_array_cnt;
375         __be32 *p;
376         int i, rc;
377 
378         dprintk("--> %s\n", __func__);
379         scratch = alloc_page(gfp_flags);
380         if (!scratch)
381                 return ERR_PTR(-ENOMEM);
382 
383         xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
384                               lgr->layoutp->len);
385         xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
386 
387         /* stripe unit and mirror_array_cnt */
388         rc = -EIO;
389         p = xdr_inline_decode(&stream, 8 + 4);
390         if (!p)
391                 goto out_err_free;
392 
393         p = xdr_decode_hyper(p, &stripe_unit);
394         mirror_array_cnt = be32_to_cpup(p++);
395         dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
396                 stripe_unit, mirror_array_cnt);
397 
398         if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
399             mirror_array_cnt == 0)
400                 goto out_err_free;
401 
402         rc = -ENOMEM;
403         fls = kzalloc(sizeof(*fls), gfp_flags);
404         if (!fls)
405                 goto out_err_free;
406 
407         fls->mirror_array_cnt = mirror_array_cnt;
408         fls->stripe_unit = stripe_unit;
409         fls->mirror_array = kcalloc(fls->mirror_array_cnt,
410                                     sizeof(fls->mirror_array[0]), gfp_flags);
411         if (fls->mirror_array == NULL)
412                 goto out_err_free;
413 
414         for (i = 0; i < fls->mirror_array_cnt; i++) {
415                 struct nfs4_ff_layout_mirror *mirror;
416                 struct auth_cred acred = { .group_info = ff_zero_group };
417                 struct rpc_cred __rcu *cred;
418                 u32 ds_count, fh_count, id;
419                 int j;
420 
421                 rc = -EIO;
422                 p = xdr_inline_decode(&stream, 4);
423                 if (!p)
424                         goto out_err_free;
425                 ds_count = be32_to_cpup(p);
426 
427                 /* FIXME: allow for striping? */
428                 if (ds_count != 1)
429                         goto out_err_free;
430 
431                 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
432                 if (fls->mirror_array[i] == NULL) {
433                         rc = -ENOMEM;
434                         goto out_err_free;
435                 }
436 
437                 fls->mirror_array[i]->ds_count = ds_count;
438 
439                 /* deviceid */
440                 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
441                 if (rc)
442                         goto out_err_free;
443 
444                 /* efficiency */
445                 rc = -EIO;
446                 p = xdr_inline_decode(&stream, 4);
447                 if (!p)
448                         goto out_err_free;
449                 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
450 
451                 /* stateid */
452                 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
453                 if (rc)
454                         goto out_err_free;
455 
456                 /* fh */
457                 rc = -EIO;
458                 p = xdr_inline_decode(&stream, 4);
459                 if (!p)
460                         goto out_err_free;
461                 fh_count = be32_to_cpup(p);
462 
463                 fls->mirror_array[i]->fh_versions =
464                         kzalloc(fh_count * sizeof(struct nfs_fh),
465                                 gfp_flags);
466                 if (fls->mirror_array[i]->fh_versions == NULL) {
467                         rc = -ENOMEM;
468                         goto out_err_free;
469                 }
470 
471                 for (j = 0; j < fh_count; j++) {
472                         rc = decode_nfs_fh(&stream,
473                                            &fls->mirror_array[i]->fh_versions[j]);
474                         if (rc)
475                                 goto out_err_free;
476                 }
477 
478                 fls->mirror_array[i]->fh_versions_cnt = fh_count;
479 
480                 /* user */
481                 rc = decode_name(&stream, &id);
482                 if (rc)
483                         goto out_err_free;
484 
485                 acred.uid = make_kuid(&init_user_ns, id);
486 
487                 /* group */
488                 rc = decode_name(&stream, &id);
489                 if (rc)
490                         goto out_err_free;
491 
492                 acred.gid = make_kgid(&init_user_ns, id);
493 
494                 /* find the cred for it */
495                 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
496                 if (IS_ERR(cred)) {
497                         rc = PTR_ERR(cred);
498                         goto out_err_free;
499                 }
500 
501                 if (lgr->range.iomode == IOMODE_READ)
502                         rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
503                 else
504                         rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
505 
506                 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
507                 if (mirror != fls->mirror_array[i]) {
508                         /* swap cred ptrs so free_mirror will clean up old */
509                         if (lgr->range.iomode == IOMODE_READ) {
510                                 cred = xchg(&mirror->ro_cred, cred);
511                                 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
512                         } else {
513                                 cred = xchg(&mirror->rw_cred, cred);
514                                 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
515                         }
516                         ff_layout_free_mirror(fls->mirror_array[i]);
517                         fls->mirror_array[i] = mirror;
518                 }
519 
520                 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
521                         lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
522                         from_kuid(&init_user_ns, acred.uid),
523                         from_kgid(&init_user_ns, acred.gid));
524         }
525 
526         p = xdr_inline_decode(&stream, 4);
527         if (!p)
528                 goto out_sort_mirrors;
529         fls->flags = be32_to_cpup(p);
530 
531         p = xdr_inline_decode(&stream, 4);
532         if (!p)
533                 goto out_sort_mirrors;
534         for (i=0; i < fls->mirror_array_cnt; i++)
535                 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
536 
537 out_sort_mirrors:
538         ff_layout_sort_mirrors(fls);
539         rc = ff_layout_check_layout(lgr);
540         if (rc)
541                 goto out_err_free;
542         ret = &fls->generic_hdr;
543         dprintk("<-- %s (success)\n", __func__);
544 out_free_page:
545         __free_page(scratch);
546         return ret;
547 out_err_free:
548         _ff_layout_free_lseg(fls);
549         ret = ERR_PTR(rc);
550         dprintk("<-- %s (%d)\n", __func__, rc);
551         goto out_free_page;
552 }
553 
554 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
555 {
556         struct pnfs_layout_segment *lseg;
557 
558         list_for_each_entry(lseg, &layout->plh_segs, pls_list)
559                 if (lseg->pls_range.iomode == IOMODE_RW)
560                         return true;
561 
562         return false;
563 }
564 
565 static void
566 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
567 {
568         struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
569 
570         dprintk("--> %s\n", __func__);
571 
572         if (lseg->pls_range.iomode == IOMODE_RW) {
573                 struct nfs4_flexfile_layout *ffl;
574                 struct inode *inode;
575 
576                 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
577                 inode = ffl->generic_hdr.plh_inode;
578                 spin_lock(&inode->i_lock);
579                 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
580                         ffl->commit_info.nbuckets = 0;
581                         kfree(ffl->commit_info.buckets);
582                         ffl->commit_info.buckets = NULL;
583                 }
584                 spin_unlock(&inode->i_lock);
585         }
586         _ff_layout_free_lseg(fls);
587 }
588 
589 /* Return 1 until we have multiple lsegs support */
590 static int
591 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
592 {
593         return 1;
594 }
595 
596 static void
597 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
598 {
599         /* first IO request? */
600         if (atomic_inc_return(&timer->n_ops) == 1) {
601                 timer->start_time = now;
602         }
603 }
604 
605 static ktime_t
606 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
607 {
608         ktime_t start;
609 
610         if (atomic_dec_return(&timer->n_ops) < 0)
611                 WARN_ON_ONCE(1);
612 
613         start = timer->start_time;
614         timer->start_time = now;
615         return ktime_sub(now, start);
616 }
617 
618 static bool
619 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
620                             struct nfs4_ff_layoutstat *layoutstat,
621                             ktime_t now)
622 {
623         s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
624         struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
625 
626         nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
627         if (!mirror->start_time)
628                 mirror->start_time = now;
629         if (mirror->report_interval != 0)
630                 report_interval = (s64)mirror->report_interval * 1000LL;
631         else if (layoutstats_timer != 0)
632                 report_interval = (s64)layoutstats_timer * 1000LL;
633         if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
634                         report_interval) {
635                 ffl->last_report_time = now;
636                 return true;
637         }
638 
639         return false;
640 }
641 
642 static void
643 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
644                 __u64 requested)
645 {
646         struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
647 
648         iostat->ops_requested++;
649         iostat->bytes_requested += requested;
650 }
651 
652 static void
653 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
654                 __u64 requested,
655                 __u64 completed,
656                 ktime_t time_completed,
657                 ktime_t time_started)
658 {
659         struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
660         ktime_t completion_time = ktime_sub(time_completed, time_started);
661         ktime_t timer;
662 
663         iostat->ops_completed++;
664         iostat->bytes_completed += completed;
665         iostat->bytes_not_delivered += requested - completed;
666 
667         timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
668         iostat->total_busy_time =
669                         ktime_add(iostat->total_busy_time, timer);
670         iostat->aggregate_completion_time =
671                         ktime_add(iostat->aggregate_completion_time,
672                                         completion_time);
673 }
674 
675 static void
676 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
677                 struct nfs4_ff_layout_mirror *mirror,
678                 __u64 requested, ktime_t now)
679 {
680         bool report;
681 
682         spin_lock(&mirror->lock);
683         report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
684         nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
685         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
686         spin_unlock(&mirror->lock);
687 
688         if (report)
689                 pnfs_report_layoutstat(inode, GFP_KERNEL);
690 }
691 
692 static void
693 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
694                 struct nfs4_ff_layout_mirror *mirror,
695                 __u64 requested,
696                 __u64 completed)
697 {
698         spin_lock(&mirror->lock);
699         nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
700                         requested, completed,
701                         ktime_get(), task->tk_start);
702         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
703         spin_unlock(&mirror->lock);
704 }
705 
706 static void
707 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
708                 struct nfs4_ff_layout_mirror *mirror,
709                 __u64 requested, ktime_t now)
710 {
711         bool report;
712 
713         spin_lock(&mirror->lock);
714         report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
715         nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
716         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
717         spin_unlock(&mirror->lock);
718 
719         if (report)
720                 pnfs_report_layoutstat(inode, GFP_NOIO);
721 }
722 
723 static void
724 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
725                 struct nfs4_ff_layout_mirror *mirror,
726                 __u64 requested,
727                 __u64 completed,
728                 enum nfs3_stable_how committed)
729 {
730         if (committed == NFS_UNSTABLE)
731                 requested = completed = 0;
732 
733         spin_lock(&mirror->lock);
734         nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
735                         requested, completed, ktime_get(), task->tk_start);
736         set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
737         spin_unlock(&mirror->lock);
738 }
739 
740 static int
741 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
742                             struct nfs_commit_info *cinfo,
743                             gfp_t gfp_flags)
744 {
745         struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
746         struct pnfs_commit_bucket *buckets;
747         int size;
748 
749         if (cinfo->ds->nbuckets != 0) {
750                 /* This assumes there is only one RW lseg per file.
751                  * To support multiple lseg per file, we need to
752                  * change struct pnfs_commit_bucket to allow dynamic
753                  * increasing nbuckets.
754                  */
755                 return 0;
756         }
757 
758         size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
759 
760         buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
761                           gfp_flags);
762         if (!buckets)
763                 return -ENOMEM;
764         else {
765                 int i;
766 
767                 spin_lock(&cinfo->inode->i_lock);
768                 if (cinfo->ds->nbuckets != 0)
769                         kfree(buckets);
770                 else {
771                         cinfo->ds->buckets = buckets;
772                         cinfo->ds->nbuckets = size;
773                         for (i = 0; i < size; i++) {
774                                 INIT_LIST_HEAD(&buckets[i].written);
775                                 INIT_LIST_HEAD(&buckets[i].committing);
776                                 /* mark direct verifier as unset */
777                                 buckets[i].direct_verf.committed =
778                                         NFS_INVALID_STABLE_HOW;
779                         }
780                 }
781                 spin_unlock(&cinfo->inode->i_lock);
782                 return 0;
783         }
784 }
785 
786 static struct nfs4_pnfs_ds *
787 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
788                                   int start_idx,
789                                   int *best_idx)
790 {
791         struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
792         struct nfs4_pnfs_ds *ds;
793         bool fail_return = false;
794         int idx;
795 
796         /* mirrors are sorted by efficiency */
797         for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
798                 if (idx+1 == fls->mirror_array_cnt)
799                         fail_return = true;
800                 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return);
801                 if (ds) {
802                         *best_idx = idx;
803                         return ds;
804                 }
805         }
806 
807         return NULL;
808 }
809 
810 static void
811 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
812                       struct nfs_page *req,
813                       bool strict_iomode)
814 {
815 retry_strict:
816         pnfs_put_lseg(pgio->pg_lseg);
817         pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
818                                            req->wb_context,
819                                            0,
820                                            NFS4_MAX_UINT64,
821                                            IOMODE_READ,
822                                            strict_iomode,
823                                            GFP_KERNEL);
824         if (IS_ERR(pgio->pg_lseg)) {
825                 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
826                 pgio->pg_lseg = NULL;
827         }
828 
829         /* If we don't have checking, do get a IOMODE_RW
830          * segment, and the server wants to avoid READs
831          * there, then retry!
832          */
833         if (pgio->pg_lseg && !strict_iomode &&
834             ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
835                 strict_iomode = true;
836                 goto retry_strict;
837         }
838 }
839 
840 static void
841 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
842                         struct nfs_page *req)
843 {
844         struct nfs_pgio_mirror *pgm;
845         struct nfs4_ff_layout_mirror *mirror;
846         struct nfs4_pnfs_ds *ds;
847         int ds_idx;
848 
849 retry:
850         pnfs_generic_pg_check_layout(pgio);
851         /* Use full layout for now */
852         if (!pgio->pg_lseg)
853                 ff_layout_pg_get_read(pgio, req, false);
854         else if (ff_layout_avoid_read_on_rw(pgio->pg_lseg))
855                 ff_layout_pg_get_read(pgio, req, true);
856 
857         /* If no lseg, fall back to read through mds */
858         if (pgio->pg_lseg == NULL)
859                 goto out_mds;
860 
861         ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
862         if (!ds) {
863                 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
864                         goto out_mds;
865                 pnfs_put_lseg(pgio->pg_lseg);
866                 pgio->pg_lseg = NULL;
867                 /* Sleep for 1 second before retrying */
868                 ssleep(1);
869                 goto retry;
870         }
871 
872         mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
873 
874         pgio->pg_mirror_idx = ds_idx;
875 
876         /* read always uses only one mirror - idx 0 for pgio layer */
877         pgm = &pgio->pg_mirrors[0];
878         pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
879 
880         return;
881 out_mds:
882         pnfs_put_lseg(pgio->pg_lseg);
883         pgio->pg_lseg = NULL;
884         nfs_pageio_reset_read_mds(pgio);
885 }
886 
887 static void
888 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
889                         struct nfs_page *req)
890 {
891         struct nfs4_ff_layout_mirror *mirror;
892         struct nfs_pgio_mirror *pgm;
893         struct nfs_commit_info cinfo;
894         struct nfs4_pnfs_ds *ds;
895         int i;
896         int status;
897 
898 retry:
899         pnfs_generic_pg_check_layout(pgio);
900         if (!pgio->pg_lseg) {
901                 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
902                                                    req->wb_context,
903                                                    0,
904                                                    NFS4_MAX_UINT64,
905                                                    IOMODE_RW,
906                                                    false,
907                                                    GFP_NOFS);
908                 if (IS_ERR(pgio->pg_lseg)) {
909                         pgio->pg_error = PTR_ERR(pgio->pg_lseg);
910                         pgio->pg_lseg = NULL;
911                         return;
912                 }
913         }
914         /* If no lseg, fall back to write through mds */
915         if (pgio->pg_lseg == NULL)
916                 goto out_mds;
917 
918         nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
919         status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
920         if (status < 0)
921                 goto out_mds;
922 
923         /* Use a direct mapping of ds_idx to pgio mirror_idx */
924         if (WARN_ON_ONCE(pgio->pg_mirror_count !=
925             FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
926                 goto out_mds;
927 
928         for (i = 0; i < pgio->pg_mirror_count; i++) {
929                 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
930                 if (!ds) {
931                         if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
932                                 goto out_mds;
933                         pnfs_put_lseg(pgio->pg_lseg);
934                         pgio->pg_lseg = NULL;
935                         /* Sleep for 1 second before retrying */
936                         ssleep(1);
937                         goto retry;
938                 }
939                 pgm = &pgio->pg_mirrors[i];
940                 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
941                 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
942         }
943 
944         return;
945 
946 out_mds:
947         pnfs_put_lseg(pgio->pg_lseg);
948         pgio->pg_lseg = NULL;
949         nfs_pageio_reset_write_mds(pgio);
950 }
951 
952 static unsigned int
953 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
954                                     struct nfs_page *req)
955 {
956         if (!pgio->pg_lseg) {
957                 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
958                                                    req->wb_context,
959                                                    0,
960                                                    NFS4_MAX_UINT64,
961                                                    IOMODE_RW,
962                                                    false,
963                                                    GFP_NOFS);
964                 if (IS_ERR(pgio->pg_lseg)) {
965                         pgio->pg_error = PTR_ERR(pgio->pg_lseg);
966                         pgio->pg_lseg = NULL;
967                         goto out;
968                 }
969         }
970         if (pgio->pg_lseg)
971                 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
972 
973         /* no lseg means that pnfs is not in use, so no mirroring here */
974         nfs_pageio_reset_write_mds(pgio);
975 out:
976         return 1;
977 }
978 
979 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
980         .pg_init = ff_layout_pg_init_read,
981         .pg_test = pnfs_generic_pg_test,
982         .pg_doio = pnfs_generic_pg_readpages,
983         .pg_cleanup = pnfs_generic_pg_cleanup,
984 };
985 
986 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
987         .pg_init = ff_layout_pg_init_write,
988         .pg_test = pnfs_generic_pg_test,
989         .pg_doio = pnfs_generic_pg_writepages,
990         .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
991         .pg_cleanup = pnfs_generic_pg_cleanup,
992 };
993 
994 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
995 {
996         struct rpc_task *task = &hdr->task;
997 
998         pnfs_layoutcommit_inode(hdr->inode, false);
999 
1000         if (retry_pnfs) {
1001                 dprintk("%s Reset task %5u for i/o through pNFS "
1002                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1003                         hdr->task.tk_pid,
1004                         hdr->inode->i_sb->s_id,
1005                         (unsigned long long)NFS_FILEID(hdr->inode),
1006                         hdr->args.count,
1007                         (unsigned long long)hdr->args.offset);
1008 
1009                 hdr->completion_ops->reschedule_io(hdr);
1010                 return;
1011         }
1012 
1013         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1014                 dprintk("%s Reset task %5u for i/o through MDS "
1015                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1016                         hdr->task.tk_pid,
1017                         hdr->inode->i_sb->s_id,
1018                         (unsigned long long)NFS_FILEID(hdr->inode),
1019                         hdr->args.count,
1020                         (unsigned long long)hdr->args.offset);
1021 
1022                 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1023         }
1024 }
1025 
1026 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1027 {
1028         struct rpc_task *task = &hdr->task;
1029 
1030         pnfs_layoutcommit_inode(hdr->inode, false);
1031 
1032         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1033                 dprintk("%s Reset task %5u for i/o through MDS "
1034                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1035                         hdr->task.tk_pid,
1036                         hdr->inode->i_sb->s_id,
1037                         (unsigned long long)NFS_FILEID(hdr->inode),
1038                         hdr->args.count,
1039                         (unsigned long long)hdr->args.offset);
1040 
1041                 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1042         }
1043 }
1044 
1045 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1046                                            struct nfs4_state *state,
1047                                            struct nfs_client *clp,
1048                                            struct pnfs_layout_segment *lseg,
1049                                            int idx)
1050 {
1051         struct pnfs_layout_hdr *lo = lseg->pls_layout;
1052         struct inode *inode = lo->plh_inode;
1053         struct nfs_server *mds_server = NFS_SERVER(inode);
1054 
1055         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1056         struct nfs_client *mds_client = mds_server->nfs_client;
1057         struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1058 
1059         switch (task->tk_status) {
1060         /* MDS state errors */
1061         case -NFS4ERR_DELEG_REVOKED:
1062         case -NFS4ERR_ADMIN_REVOKED:
1063         case -NFS4ERR_BAD_STATEID:
1064                 if (state == NULL)
1065                         break;
1066                 nfs_remove_bad_delegation(state->inode, NULL);
1067         case -NFS4ERR_OPENMODE:
1068                 if (state == NULL)
1069                         break;
1070                 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1071                         goto out_bad_stateid;
1072                 goto wait_on_recovery;
1073         case -NFS4ERR_EXPIRED:
1074                 if (state != NULL) {
1075                         if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1076                                 goto out_bad_stateid;
1077                 }
1078                 nfs4_schedule_lease_recovery(mds_client);
1079                 goto wait_on_recovery;
1080         /* DS session errors */
1081         case -NFS4ERR_BADSESSION:
1082         case -NFS4ERR_BADSLOT:
1083         case -NFS4ERR_BAD_HIGH_SLOT:
1084         case -NFS4ERR_DEADSESSION:
1085         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1086         case -NFS4ERR_SEQ_FALSE_RETRY:
1087         case -NFS4ERR_SEQ_MISORDERED:
1088                 dprintk("%s ERROR %d, Reset session. Exchangeid "
1089                         "flags 0x%x\n", __func__, task->tk_status,
1090                         clp->cl_exchange_flags);
1091                 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1092                 break;
1093         case -NFS4ERR_DELAY:
1094         case -NFS4ERR_GRACE:
1095                 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1096                 break;
1097         case -NFS4ERR_RETRY_UNCACHED_REP:
1098                 break;
1099         /* Invalidate Layout errors */
1100         case -NFS4ERR_PNFS_NO_LAYOUT:
1101         case -ESTALE:           /* mapped NFS4ERR_STALE */
1102         case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
1103         case -EISDIR:           /* mapped NFS4ERR_ISDIR */
1104         case -NFS4ERR_FHEXPIRED:
1105         case -NFS4ERR_WRONG_TYPE:
1106                 dprintk("%s Invalid layout error %d\n", __func__,
1107                         task->tk_status);
1108                 /*
1109                  * Destroy layout so new i/o will get a new layout.
1110                  * Layout will not be destroyed until all current lseg
1111                  * references are put. Mark layout as invalid to resend failed
1112                  * i/o and all i/o waiting on the slot table to the MDS until
1113                  * layout is destroyed and a new valid layout is obtained.
1114                  */
1115                 pnfs_destroy_layout(NFS_I(inode));
1116                 rpc_wake_up(&tbl->slot_tbl_waitq);
1117                 goto reset;
1118         /* RPC connection errors */
1119         case -ECONNREFUSED:
1120         case -EHOSTDOWN:
1121         case -EHOSTUNREACH:
1122         case -ENETUNREACH:
1123         case -EIO:
1124         case -ETIMEDOUT:
1125         case -EPIPE:
1126                 dprintk("%s DS connection error %d\n", __func__,
1127                         task->tk_status);
1128                 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1129                                 &devid->deviceid);
1130                 rpc_wake_up(&tbl->slot_tbl_waitq);
1131                 /* fall through */
1132         default:
1133                 if (ff_layout_avoid_mds_available_ds(lseg))
1134                         return -NFS4ERR_RESET_TO_PNFS;
1135 reset:
1136                 dprintk("%s Retry through MDS. Error %d\n", __func__,
1137                         task->tk_status);
1138                 return -NFS4ERR_RESET_TO_MDS;
1139         }
1140 out:
1141         task->tk_status = 0;
1142         return -EAGAIN;
1143 out_bad_stateid:
1144         task->tk_status = -EIO;
1145         return 0;
1146 wait_on_recovery:
1147         rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
1148         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
1149                 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
1150         goto out;
1151 }
1152 
1153 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1154 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1155                                            struct pnfs_layout_segment *lseg,
1156                                            int idx)
1157 {
1158         struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1159 
1160         switch (task->tk_status) {
1161         /* File access problems. Don't mark the device as unavailable */
1162         case -EACCES:
1163         case -ESTALE:
1164         case -EISDIR:
1165         case -EBADHANDLE:
1166         case -ELOOP:
1167         case -ENOSPC:
1168                 break;
1169         case -EJUKEBOX:
1170                 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1171                 goto out_retry;
1172         default:
1173                 dprintk("%s DS connection error %d\n", __func__,
1174                         task->tk_status);
1175                 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1176                                 &devid->deviceid);
1177         }
1178         /* FIXME: Need to prevent infinite looping here. */
1179         return -NFS4ERR_RESET_TO_PNFS;
1180 out_retry:
1181         task->tk_status = 0;
1182         rpc_restart_call_prepare(task);
1183         rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1184         return -EAGAIN;
1185 }
1186 
1187 static int ff_layout_async_handle_error(struct rpc_task *task,
1188                                         struct nfs4_state *state,
1189                                         struct nfs_client *clp,
1190                                         struct pnfs_layout_segment *lseg,
1191                                         int idx)
1192 {
1193         int vers = clp->cl_nfs_mod->rpc_vers->number;
1194 
1195         if (task->tk_status >= 0)
1196                 return 0;
1197 
1198         /* Handle the case of an invalid layout segment */
1199         if (!pnfs_is_valid_lseg(lseg))
1200                 return -NFS4ERR_RESET_TO_PNFS;
1201 
1202         switch (vers) {
1203         case 3:
1204                 return ff_layout_async_handle_error_v3(task, lseg, idx);
1205         case 4:
1206                 return ff_layout_async_handle_error_v4(task, state, clp,
1207                                                        lseg, idx);
1208         default:
1209                 /* should never happen */
1210                 WARN_ON_ONCE(1);
1211                 return 0;
1212         }
1213 }
1214 
1215 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1216                                         int idx, u64 offset, u64 length,
1217                                         u32 status, int opnum, int error)
1218 {
1219         struct nfs4_ff_layout_mirror *mirror;
1220         int err;
1221 
1222         if (status == 0) {
1223                 switch (error) {
1224                 case -ETIMEDOUT:
1225                 case -EPFNOSUPPORT:
1226                 case -EPROTONOSUPPORT:
1227                 case -EOPNOTSUPP:
1228                 case -ECONNREFUSED:
1229                 case -ECONNRESET:
1230                 case -EHOSTDOWN:
1231                 case -EHOSTUNREACH:
1232                 case -ENETUNREACH:
1233                 case -EADDRINUSE:
1234                 case -ENOBUFS:
1235                 case -EPIPE:
1236                 case -EPERM:
1237                         status = NFS4ERR_NXIO;
1238                         break;
1239                 case -EACCES:
1240                         status = NFS4ERR_ACCESS;
1241                         break;
1242                 default:
1243                         return;
1244                 }
1245         }
1246 
1247         switch (status) {
1248         case NFS4ERR_DELAY:
1249         case NFS4ERR_GRACE:
1250                 return;
1251         default:
1252                 break;
1253         }
1254 
1255         mirror = FF_LAYOUT_COMP(lseg, idx);
1256         err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1257                                        mirror, offset, length, status, opnum,
1258                                        GFP_NOIO);
1259         pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
1260         dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1261 }
1262 
1263 /* NFS_PROTO call done callback routines */
1264 static int ff_layout_read_done_cb(struct rpc_task *task,
1265                                 struct nfs_pgio_header *hdr)
1266 {
1267         int err;
1268 
1269         trace_nfs4_pnfs_read(hdr, task->tk_status);
1270         if (task->tk_status < 0)
1271                 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1272                                             hdr->args.offset, hdr->args.count,
1273                                             hdr->res.op_status, OP_READ,
1274                                             task->tk_status);
1275         err = ff_layout_async_handle_error(task, hdr->args.context->state,
1276                                            hdr->ds_clp, hdr->lseg,
1277                                            hdr->pgio_mirror_idx);
1278 
1279         switch (err) {
1280         case -NFS4ERR_RESET_TO_PNFS:
1281                 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1282                                         hdr->pgio_mirror_idx + 1,
1283                                         &hdr->pgio_mirror_idx))
1284                         goto out_eagain;
1285                 ff_layout_read_record_layoutstats_done(task, hdr);
1286                 pnfs_read_resend_pnfs(hdr);
1287                 return task->tk_status;
1288         case -NFS4ERR_RESET_TO_MDS:
1289                 ff_layout_reset_read(hdr);
1290                 return task->tk_status;
1291         case -EAGAIN:
1292                 goto out_eagain;
1293         }
1294 
1295         return 0;
1296 out_eagain:
1297         rpc_restart_call_prepare(task);
1298         return -EAGAIN;
1299 }
1300 
1301 static bool
1302 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1303 {
1304         return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1305 }
1306 
1307 /*
1308  * We reference the rpc_cred of the first WRITE that triggers the need for
1309  * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1310  * rfc5661 is not clear about which credential should be used.
1311  *
1312  * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1313  * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1314  * we always send layoutcommit after DS writes.
1315  */
1316 static void
1317 ff_layout_set_layoutcommit(struct inode *inode,
1318                 struct pnfs_layout_segment *lseg,
1319                 loff_t end_offset)
1320 {
1321         if (!ff_layout_need_layoutcommit(lseg))
1322                 return;
1323 
1324         pnfs_set_layoutcommit(inode, lseg, end_offset);
1325         dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1326                 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1327 }
1328 
1329 static bool
1330 ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
1331 {
1332         /* No mirroring for now */
1333         struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1334 
1335         return ff_layout_test_devid_unavailable(node);
1336 }
1337 
1338 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1339                 struct nfs_pgio_header *hdr)
1340 {
1341         if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1342                 return;
1343         nfs4_ff_layout_stat_io_start_read(hdr->inode,
1344                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1345                         hdr->args.count,
1346                         task->tk_start);
1347 }
1348 
1349 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1350                 struct nfs_pgio_header *hdr)
1351 {
1352         if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1353                 return;
1354         nfs4_ff_layout_stat_io_end_read(task,
1355                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1356                         hdr->args.count,
1357                         hdr->res.count);
1358 }
1359 
1360 static int ff_layout_read_prepare_common(struct rpc_task *task,
1361                                          struct nfs_pgio_header *hdr)
1362 {
1363         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1364                 rpc_exit(task, -EIO);
1365                 return -EIO;
1366         }
1367         if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1368                 rpc_exit(task, -EHOSTDOWN);
1369                 return -EAGAIN;
1370         }
1371 
1372         ff_layout_read_record_layoutstats_start(task, hdr);
1373         return 0;
1374 }
1375 
1376 /*
1377  * Call ops for the async read/write cases
1378  * In the case of dense layouts, the offset needs to be reset to its
1379  * original value.
1380  */
1381 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1382 {
1383         struct nfs_pgio_header *hdr = data;
1384 
1385         if (ff_layout_read_prepare_common(task, hdr))
1386                 return;
1387 
1388         rpc_call_start(task);
1389 }
1390 
1391 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1392 {
1393         struct nfs_pgio_header *hdr = data;
1394 
1395         if (nfs4_setup_sequence(hdr->ds_clp,
1396                                 &hdr->args.seq_args,
1397                                 &hdr->res.seq_res,
1398                                 task))
1399                 return;
1400 
1401         if (ff_layout_read_prepare_common(task, hdr))
1402                 return;
1403 
1404         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1405                         hdr->args.lock_context, FMODE_READ) == -EIO)
1406                 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1407 }
1408 
1409 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1410 {
1411         struct nfs_pgio_header *hdr = data;
1412 
1413         dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1414 
1415         if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1416             task->tk_status == 0) {
1417                 nfs4_sequence_done(task, &hdr->res.seq_res);
1418                 return;
1419         }
1420 
1421         /* Note this may cause RPC to be resent */
1422         hdr->mds_ops->rpc_call_done(task, hdr);
1423 }
1424 
1425 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1426 {
1427         struct nfs_pgio_header *hdr = data;
1428 
1429         ff_layout_read_record_layoutstats_done(task, hdr);
1430         rpc_count_iostats_metrics(task,
1431             &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1432 }
1433 
1434 static void ff_layout_read_release(void *data)
1435 {
1436         struct nfs_pgio_header *hdr = data;
1437 
1438         ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1439         pnfs_generic_rw_release(data);
1440 }
1441 
1442 
1443 static int ff_layout_write_done_cb(struct rpc_task *task,
1444                                 struct nfs_pgio_header *hdr)
1445 {
1446         loff_t end_offs = 0;
1447         int err;
1448 
1449         trace_nfs4_pnfs_write(hdr, task->tk_status);
1450         if (task->tk_status < 0)
1451                 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1452                                             hdr->args.offset, hdr->args.count,
1453                                             hdr->res.op_status, OP_WRITE,
1454                                             task->tk_status);
1455         err = ff_layout_async_handle_error(task, hdr->args.context->state,
1456                                            hdr->ds_clp, hdr->lseg,
1457                                            hdr->pgio_mirror_idx);
1458 
1459         switch (err) {
1460         case -NFS4ERR_RESET_TO_PNFS:
1461                 ff_layout_reset_write(hdr, true);
1462                 return task->tk_status;
1463         case -NFS4ERR_RESET_TO_MDS:
1464                 ff_layout_reset_write(hdr, false);
1465                 return task->tk_status;
1466         case -EAGAIN:
1467                 return -EAGAIN;
1468         }
1469 
1470         if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1471             hdr->res.verf->committed == NFS_DATA_SYNC)
1472                 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1473 
1474         /* Note: if the write is unstable, don't set end_offs until commit */
1475         ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1476 
1477         /* zero out fattr since we don't care DS attr at all */
1478         hdr->fattr.valid = 0;
1479         if (task->tk_status >= 0)
1480                 nfs_writeback_update_inode(hdr);
1481 
1482         return 0;
1483 }
1484 
1485 static int ff_layout_commit_done_cb(struct rpc_task *task,
1486                                      struct nfs_commit_data *data)
1487 {
1488         int err;
1489 
1490         trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1491         if (task->tk_status < 0)
1492                 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1493                                             data->args.offset, data->args.count,
1494                                             data->res.op_status, OP_COMMIT,
1495                                             task->tk_status);
1496         err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1497                                            data->lseg, data->ds_commit_index);
1498 
1499         switch (err) {
1500         case -NFS4ERR_RESET_TO_PNFS:
1501                 pnfs_generic_prepare_to_resend_writes(data);
1502                 return -EAGAIN;
1503         case -NFS4ERR_RESET_TO_MDS:
1504                 pnfs_generic_prepare_to_resend_writes(data);
1505                 return -EAGAIN;
1506         case -EAGAIN:
1507                 rpc_restart_call_prepare(task);
1508                 return -EAGAIN;
1509         }
1510 
1511         ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1512 
1513         return 0;
1514 }
1515 
1516 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1517                 struct nfs_pgio_header *hdr)
1518 {
1519         if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1520                 return;
1521         nfs4_ff_layout_stat_io_start_write(hdr->inode,
1522                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1523                         hdr->args.count,
1524                         task->tk_start);
1525 }
1526 
1527 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1528                 struct nfs_pgio_header *hdr)
1529 {
1530         if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1531                 return;
1532         nfs4_ff_layout_stat_io_end_write(task,
1533                         FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1534                         hdr->args.count, hdr->res.count,
1535                         hdr->res.verf->committed);
1536 }
1537 
1538 static int ff_layout_write_prepare_common(struct rpc_task *task,
1539                                           struct nfs_pgio_header *hdr)
1540 {
1541         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1542                 rpc_exit(task, -EIO);
1543                 return -EIO;
1544         }
1545 
1546         if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1547                 rpc_exit(task, -EHOSTDOWN);
1548                 return -EAGAIN;
1549         }
1550 
1551         ff_layout_write_record_layoutstats_start(task, hdr);
1552         return 0;
1553 }
1554 
1555 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1556 {
1557         struct nfs_pgio_header *hdr = data;
1558 
1559         if (ff_layout_write_prepare_common(task, hdr))
1560                 return;
1561 
1562         rpc_call_start(task);
1563 }
1564 
1565 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1566 {
1567         struct nfs_pgio_header *hdr = data;
1568 
1569         if (nfs4_setup_sequence(hdr->ds_clp,
1570                                 &hdr->args.seq_args,
1571                                 &hdr->res.seq_res,
1572                                 task))
1573                 return;
1574 
1575         if (ff_layout_write_prepare_common(task, hdr))
1576                 return;
1577 
1578         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1579                         hdr->args.lock_context, FMODE_WRITE) == -EIO)
1580                 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1581 }
1582 
1583 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1584 {
1585         struct nfs_pgio_header *hdr = data;
1586 
1587         if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1588             task->tk_status == 0) {
1589                 nfs4_sequence_done(task, &hdr->res.seq_res);
1590                 return;
1591         }
1592 
1593         /* Note this may cause RPC to be resent */
1594         hdr->mds_ops->rpc_call_done(task, hdr);
1595 }
1596 
1597 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1598 {
1599         struct nfs_pgio_header *hdr = data;
1600 
1601         ff_layout_write_record_layoutstats_done(task, hdr);
1602         rpc_count_iostats_metrics(task,
1603             &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1604 }
1605 
1606 static void ff_layout_write_release(void *data)
1607 {
1608         struct nfs_pgio_header *hdr = data;
1609 
1610         ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1611         pnfs_generic_rw_release(data);
1612 }
1613 
1614 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1615                 struct nfs_commit_data *cdata)
1616 {
1617         if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1618                 return;
1619         nfs4_ff_layout_stat_io_start_write(cdata->inode,
1620                         FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1621                         0, task->tk_start);
1622 }
1623 
1624 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1625                 struct nfs_commit_data *cdata)
1626 {
1627         struct nfs_page *req;
1628         __u64 count = 0;
1629 
1630         if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1631                 return;
1632 
1633         if (task->tk_status == 0) {
1634                 list_for_each_entry(req, &cdata->pages, wb_list)
1635                         count += req->wb_bytes;
1636         }
1637         nfs4_ff_layout_stat_io_end_write(task,
1638                         FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1639                         count, count, NFS_FILE_SYNC);
1640 }
1641 
1642 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1643                 struct nfs_commit_data *cdata)
1644 {
1645         ff_layout_commit_record_layoutstats_start(task, cdata);
1646 }
1647 
1648 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1649 {
1650         ff_layout_commit_prepare_common(task, data);
1651         rpc_call_start(task);
1652 }
1653 
1654 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1655 {
1656         struct nfs_commit_data *wdata = data;
1657 
1658         if (nfs4_setup_sequence(wdata->ds_clp,
1659                                 &wdata->args.seq_args,
1660                                 &wdata->res.seq_res,
1661                                 task))
1662                 return;
1663         ff_layout_commit_prepare_common(task, data);
1664 }
1665 
1666 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1667 {
1668         pnfs_generic_write_commit_done(task, data);
1669 }
1670 
1671 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1672 {
1673         struct nfs_commit_data *cdata = data;
1674 
1675         ff_layout_commit_record_layoutstats_done(task, cdata);
1676         rpc_count_iostats_metrics(task,
1677             &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1678 }
1679 
1680 static void ff_layout_commit_release(void *data)
1681 {
1682         struct nfs_commit_data *cdata = data;
1683 
1684         ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1685         pnfs_generic_commit_release(data);
1686 }
1687 
1688 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1689         .rpc_call_prepare = ff_layout_read_prepare_v3,
1690         .rpc_call_done = ff_layout_read_call_done,
1691         .rpc_count_stats = ff_layout_read_count_stats,
1692         .rpc_release = ff_layout_read_release,
1693 };
1694 
1695 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1696         .rpc_call_prepare = ff_layout_read_prepare_v4,
1697         .rpc_call_done = ff_layout_read_call_done,
1698         .rpc_count_stats = ff_layout_read_count_stats,
1699         .rpc_release = ff_layout_read_release,
1700 };
1701 
1702 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1703         .rpc_call_prepare = ff_layout_write_prepare_v3,
1704         .rpc_call_done = ff_layout_write_call_done,
1705         .rpc_count_stats = ff_layout_write_count_stats,
1706         .rpc_release = ff_layout_write_release,
1707 };
1708 
1709 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1710         .rpc_call_prepare = ff_layout_write_prepare_v4,
1711         .rpc_call_done = ff_layout_write_call_done,
1712         .rpc_count_stats = ff_layout_write_count_stats,
1713         .rpc_release = ff_layout_write_release,
1714 };
1715 
1716 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1717         .rpc_call_prepare = ff_layout_commit_prepare_v3,
1718         .rpc_call_done = ff_layout_commit_done,
1719         .rpc_count_stats = ff_layout_commit_count_stats,
1720         .rpc_release = ff_layout_commit_release,
1721 };
1722 
1723 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1724         .rpc_call_prepare = ff_layout_commit_prepare_v4,
1725         .rpc_call_done = ff_layout_commit_done,
1726         .rpc_count_stats = ff_layout_commit_count_stats,
1727         .rpc_release = ff_layout_commit_release,
1728 };
1729 
1730 static enum pnfs_try_status
1731 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1732 {
1733         struct pnfs_layout_segment *lseg = hdr->lseg;
1734         struct nfs4_pnfs_ds *ds;
1735         struct rpc_clnt *ds_clnt;
1736         struct rpc_cred *ds_cred;
1737         loff_t offset = hdr->args.offset;
1738         u32 idx = hdr->pgio_mirror_idx;
1739         int vers;
1740         struct nfs_fh *fh;
1741 
1742         dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1743                 __func__, hdr->inode->i_ino,
1744                 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1745 
1746         ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1747         if (!ds)
1748                 goto out_failed;
1749 
1750         ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1751                                                    hdr->inode);
1752         if (IS_ERR(ds_clnt))
1753                 goto out_failed;
1754 
1755         ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1756         if (!ds_cred)
1757                 goto out_failed;
1758 
1759         vers = nfs4_ff_layout_ds_version(lseg, idx);
1760 
1761         dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1762                 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1763 
1764         hdr->pgio_done_cb = ff_layout_read_done_cb;
1765         atomic_inc(&ds->ds_clp->cl_count);
1766         hdr->ds_clp = ds->ds_clp;
1767         fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1768         if (fh)
1769                 hdr->args.fh = fh;
1770         /*
1771          * Note that if we ever decide to split across DSes,
1772          * then we may need to handle dense-like offsets.
1773          */
1774         hdr->args.offset = offset;
1775         hdr->mds_offset = offset;
1776 
1777         /* Perform an asynchronous read to ds */
1778         nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1779                           vers == 3 ? &ff_layout_read_call_ops_v3 :
1780                                       &ff_layout_read_call_ops_v4,
1781                           0, RPC_TASK_SOFTCONN);
1782         put_rpccred(ds_cred);
1783         return PNFS_ATTEMPTED;
1784 
1785 out_failed:
1786         if (ff_layout_avoid_mds_available_ds(lseg))
1787                 return PNFS_TRY_AGAIN;
1788         return PNFS_NOT_ATTEMPTED;
1789 }
1790 
1791 /* Perform async writes. */
1792 static enum pnfs_try_status
1793 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1794 {
1795         struct pnfs_layout_segment *lseg = hdr->lseg;
1796         struct nfs4_pnfs_ds *ds;
1797         struct rpc_clnt *ds_clnt;
1798         struct rpc_cred *ds_cred;
1799         loff_t offset = hdr->args.offset;
1800         int vers;
1801         struct nfs_fh *fh;
1802         int idx = hdr->pgio_mirror_idx;
1803 
1804         ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1805         if (!ds)
1806                 goto out_failed;
1807 
1808         ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1809                                                    hdr->inode);
1810         if (IS_ERR(ds_clnt))
1811                 goto out_failed;
1812 
1813         ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1814         if (!ds_cred)
1815                 goto out_failed;
1816 
1817         vers = nfs4_ff_layout_ds_version(lseg, idx);
1818 
1819         dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1820                 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1821                 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1822                 vers);
1823 
1824         hdr->pgio_done_cb = ff_layout_write_done_cb;
1825         atomic_inc(&ds->ds_clp->cl_count);
1826         hdr->ds_clp = ds->ds_clp;
1827         hdr->ds_commit_idx = idx;
1828         fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1829         if (fh)
1830                 hdr->args.fh = fh;
1831 
1832         /*
1833          * Note that if we ever decide to split across DSes,
1834          * then we may need to handle dense-like offsets.
1835          */
1836         hdr->args.offset = offset;
1837 
1838         /* Perform an asynchronous write */
1839         nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1840                           vers == 3 ? &ff_layout_write_call_ops_v3 :
1841                                       &ff_layout_write_call_ops_v4,
1842                           sync, RPC_TASK_SOFTCONN);
1843         put_rpccred(ds_cred);
1844         return PNFS_ATTEMPTED;
1845 
1846 out_failed:
1847         if (ff_layout_avoid_mds_available_ds(lseg))
1848                 return PNFS_TRY_AGAIN;
1849         return PNFS_NOT_ATTEMPTED;
1850 }
1851 
1852 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1853 {
1854         return i;
1855 }
1856 
1857 static struct nfs_fh *
1858 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1859 {
1860         struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1861 
1862         /* FIXME: Assume that there is only one NFS version available
1863          * for the DS.
1864          */
1865         return &flseg->mirror_array[i]->fh_versions[0];
1866 }
1867 
1868 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1869 {
1870         struct pnfs_layout_segment *lseg = data->lseg;
1871         struct nfs4_pnfs_ds *ds;
1872         struct rpc_clnt *ds_clnt;
1873         struct rpc_cred *ds_cred;
1874         u32 idx;
1875         int vers, ret;
1876         struct nfs_fh *fh;
1877 
1878         idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1879         ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1880         if (!ds)
1881                 goto out_err;
1882 
1883         ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1884                                                    data->inode);
1885         if (IS_ERR(ds_clnt))
1886                 goto out_err;
1887 
1888         ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1889         if (!ds_cred)
1890                 goto out_err;
1891 
1892         vers = nfs4_ff_layout_ds_version(lseg, idx);
1893 
1894         dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1895                 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1896                 vers);
1897         data->commit_done_cb = ff_layout_commit_done_cb;
1898         data->cred = ds_cred;
1899         atomic_inc(&ds->ds_clp->cl_count);
1900         data->ds_clp = ds->ds_clp;
1901         fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1902         if (fh)
1903                 data->args.fh = fh;
1904 
1905         ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1906                                    vers == 3 ? &ff_layout_commit_call_ops_v3 :
1907                                                &ff_layout_commit_call_ops_v4,
1908                                    how, RPC_TASK_SOFTCONN);
1909         put_rpccred(ds_cred);
1910         return ret;
1911 out_err:
1912         pnfs_generic_prepare_to_resend_writes(data);
1913         pnfs_generic_commit_release(data);
1914         return -EAGAIN;
1915 }
1916 
1917 static int
1918 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1919                            int how, struct nfs_commit_info *cinfo)
1920 {
1921         return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1922                                             ff_layout_initiate_commit);
1923 }
1924 
1925 static struct pnfs_ds_commit_info *
1926 ff_layout_get_ds_info(struct inode *inode)
1927 {
1928         struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1929 
1930         if (layout == NULL)
1931                 return NULL;
1932 
1933         return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1934 }
1935 
1936 static void
1937 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1938 {
1939         nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1940                                                   id_node));
1941 }
1942 
1943 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
1944                                   const struct nfs4_layoutreturn_args *args,
1945                                   const struct nfs4_flexfile_layoutreturn_args *ff_args)
1946 {
1947         __be32 *start;
1948 
1949         start = xdr_reserve_space(xdr, 4);
1950         if (unlikely(!start))
1951                 return -E2BIG;
1952 
1953         *start = cpu_to_be32(ff_args->num_errors);
1954         /* This assume we always return _ALL_ layouts */
1955         return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
1956 }
1957 
1958 static void
1959 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
1960 {
1961         WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
1962 }
1963 
1964 static void
1965 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
1966                             const nfs4_stateid *stateid,
1967                             const struct nfs42_layoutstat_devinfo *devinfo)
1968 {
1969         __be32 *p;
1970 
1971         p = xdr_reserve_space(xdr, 8 + 8);
1972         p = xdr_encode_hyper(p, devinfo->offset);
1973         p = xdr_encode_hyper(p, devinfo->length);
1974         encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
1975         p = xdr_reserve_space(xdr, 4*8);
1976         p = xdr_encode_hyper(p, devinfo->read_count);
1977         p = xdr_encode_hyper(p, devinfo->read_bytes);
1978         p = xdr_encode_hyper(p, devinfo->write_count);
1979         p = xdr_encode_hyper(p, devinfo->write_bytes);
1980         encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
1981 }
1982 
1983 static void
1984 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
1985                             const nfs4_stateid *stateid,
1986                             const struct nfs42_layoutstat_devinfo *devinfo)
1987 {
1988         ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
1989         ff_layout_encode_ff_layoutupdate(xdr, devinfo,
1990                         devinfo->ld_private.data);
1991 }
1992 
1993 /* report nothing for now */
1994 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
1995                 const struct nfs4_layoutreturn_args *args,
1996                 struct nfs4_flexfile_layoutreturn_args *ff_args)
1997 {
1998         __be32 *p;
1999         int i;
2000 
2001         p = xdr_reserve_space(xdr, 4);
2002         *p = cpu_to_be32(ff_args->num_dev);
2003         for (i = 0; i < ff_args->num_dev; i++)
2004                 ff_layout_encode_ff_iostat(xdr,
2005                                 &args->layout->plh_stateid,
2006                                 &ff_args->devinfo[i]);
2007 }
2008 
2009 static void
2010 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2011                 unsigned int num_entries)
2012 {
2013         unsigned int i;
2014 
2015         for (i = 0; i < num_entries; i++) {
2016                 if (!devinfo[i].ld_private.ops)
2017                         continue;
2018                 if (!devinfo[i].ld_private.ops->free)
2019                         continue;
2020                 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2021         }
2022 }
2023 
2024 static struct nfs4_deviceid_node *
2025 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2026                               struct pnfs_device *pdev, gfp_t gfp_flags)
2027 {
2028         struct nfs4_ff_layout_ds *dsaddr;
2029 
2030         dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2031         if (!dsaddr)
2032                 return NULL;
2033         return &dsaddr->id_node;
2034 }
2035 
2036 static void
2037 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2038                 const void *voidargs,
2039                 const struct nfs4_xdr_opaque_data *ff_opaque)
2040 {
2041         const struct nfs4_layoutreturn_args *args = voidargs;
2042         struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2043         struct xdr_buf tmp_buf = {
2044                 .head = {
2045                         [0] = {
2046                                 .iov_base = page_address(ff_args->pages[0]),
2047                         },
2048                 },
2049                 .buflen = PAGE_SIZE,
2050         };
2051         struct xdr_stream tmp_xdr;
2052         __be32 *start;
2053 
2054         dprintk("%s: Begin\n", __func__);
2055 
2056         xdr_init_encode(&tmp_xdr, &tmp_buf, NULL);
2057 
2058         ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2059         ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2060 
2061         start = xdr_reserve_space(xdr, 4);
2062         *start = cpu_to_be32(tmp_buf.len);
2063         xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2064 
2065         dprintk("%s: Return\n", __func__);
2066 }
2067 
2068 static void
2069 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2070 {
2071         struct nfs4_flexfile_layoutreturn_args *ff_args;
2072 
2073         if (!args->data)
2074                 return;
2075         ff_args = args->data;
2076         args->data = NULL;
2077 
2078         ff_layout_free_ds_ioerr(&ff_args->errors);
2079         ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2080 
2081         put_page(ff_args->pages[0]);
2082         kfree(ff_args);
2083 }
2084 
2085 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2086         .encode = ff_layout_encode_layoutreturn,
2087         .free = ff_layout_free_layoutreturn,
2088 };
2089 
2090 static int
2091 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2092 {
2093         struct nfs4_flexfile_layoutreturn_args *ff_args;
2094         struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2095 
2096         ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2097         if (!ff_args)
2098                 goto out_nomem;
2099         ff_args->pages[0] = alloc_page(GFP_KERNEL);
2100         if (!ff_args->pages[0])
2101                 goto out_nomem_free;
2102 
2103         INIT_LIST_HEAD(&ff_args->errors);
2104         ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2105                         &args->range, &ff_args->errors,
2106                         FF_LAYOUTRETURN_MAXERR);
2107 
2108         spin_lock(&args->inode->i_lock);
2109         ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2110                         &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2111         spin_unlock(&args->inode->i_lock);
2112 
2113         args->ld_private->ops = &layoutreturn_ops;
2114         args->ld_private->data = ff_args;
2115         return 0;
2116 out_nomem_free:
2117         kfree(ff_args);
2118 out_nomem:
2119         return -ENOMEM;
2120 }
2121 
2122 static int
2123 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2124 {
2125         const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2126 
2127         return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2128 }
2129 
2130 static size_t
2131 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2132                           const int buflen)
2133 {
2134         const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2135         const struct in6_addr *addr = &sin6->sin6_addr;
2136 
2137         /*
2138          * RFC 4291, Section 2.2.2
2139          *
2140          * Shorthanded ANY address
2141          */
2142         if (ipv6_addr_any(addr))
2143                 return snprintf(buf, buflen, "::");
2144 
2145         /*
2146          * RFC 4291, Section 2.2.2
2147          *
2148          * Shorthanded loopback address
2149          */
2150         if (ipv6_addr_loopback(addr))
2151                 return snprintf(buf, buflen, "::1");
2152 
2153         /*
2154          * RFC 4291, Section 2.2.3
2155          *
2156          * Special presentation address format for mapped v4
2157          * addresses.
2158          */
2159         if (ipv6_addr_v4mapped(addr))
2160                 return snprintf(buf, buflen, "::ffff:%pI4",
2161                                         &addr->s6_addr32[3]);
2162 
2163         /*
2164          * RFC 4291, Section 2.2.1
2165          */
2166         return snprintf(buf, buflen, "%pI6c", addr);
2167 }
2168 
2169 /* Derived from rpc_sockaddr2uaddr */
2170 static void
2171 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2172 {
2173         struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2174         char portbuf[RPCBIND_MAXUADDRPLEN];
2175         char addrbuf[RPCBIND_MAXUADDRLEN];
2176         char *netid;
2177         unsigned short port;
2178         int len, netid_len;
2179         __be32 *p;
2180 
2181         switch (sap->sa_family) {
2182         case AF_INET:
2183                 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2184                         return;
2185                 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2186                 netid = "tcp";
2187                 netid_len = 3;
2188                 break;
2189         case AF_INET6:
2190                 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2191                         return;
2192                 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2193                 netid = "tcp6";
2194                 netid_len = 4;
2195                 break;
2196         default:
2197                 /* we only support tcp and tcp6 */
2198                 WARN_ON_ONCE(1);
2199                 return;
2200         }
2201 
2202         snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2203         len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2204 
2205         p = xdr_reserve_space(xdr, 4 + netid_len);
2206         xdr_encode_opaque(p, netid, netid_len);
2207 
2208         p = xdr_reserve_space(xdr, 4 + len);
2209         xdr_encode_opaque(p, addrbuf, len);
2210 }
2211 
2212 static void
2213 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2214                          ktime_t t)
2215 {
2216         struct timespec64 ts;
2217         __be32 *p;
2218 
2219         p = xdr_reserve_space(xdr, 12);
2220         ts = ktime_to_timespec64(t);
2221         p = xdr_encode_hyper(p, ts.tv_sec);
2222         *p++ = cpu_to_be32(ts.tv_nsec);
2223 }
2224 
2225 static void
2226 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2227                             struct nfs4_ff_io_stat *stat)
2228 {
2229         __be32 *p;
2230 
2231         p = xdr_reserve_space(xdr, 5 * 8);
2232         p = xdr_encode_hyper(p, stat->ops_requested);
2233         p = xdr_encode_hyper(p, stat->bytes_requested);
2234         p = xdr_encode_hyper(p, stat->ops_completed);
2235         p = xdr_encode_hyper(p, stat->bytes_completed);
2236         p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2237         ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2238         ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2239 }
2240 
2241 static void
2242 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2243                               const struct nfs42_layoutstat_devinfo *devinfo,
2244                               struct nfs4_ff_layout_mirror *mirror)
2245 {
2246         struct nfs4_pnfs_ds_addr *da;
2247         struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2248         struct nfs_fh *fh = &mirror->fh_versions[0];
2249         __be32 *p;
2250 
2251         da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2252         dprintk("%s: DS %s: encoding address %s\n",
2253                 __func__, ds->ds_remotestr, da->da_remotestr);
2254         /* netaddr4 */
2255         ff_layout_encode_netaddr(xdr, da);
2256         /* nfs_fh4 */
2257         p = xdr_reserve_space(xdr, 4 + fh->size);
2258         xdr_encode_opaque(p, fh->data, fh->size);
2259         /* ff_io_latency4 read */
2260         spin_lock(&mirror->lock);
2261         ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2262         /* ff_io_latency4 write */
2263         ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2264         spin_unlock(&mirror->lock);
2265         /* nfstime4 */
2266         ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2267         /* bool */
2268         p = xdr_reserve_space(xdr, 4);
2269         *p = cpu_to_be32(false);
2270 }
2271 
2272 static void
2273 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2274                              const struct nfs4_xdr_opaque_data *opaque)
2275 {
2276         struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2277                         struct nfs42_layoutstat_devinfo, ld_private);
2278         __be32 *start;
2279 
2280         /* layoutupdate length */
2281         start = xdr_reserve_space(xdr, 4);
2282         ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2283 
2284         *start = cpu_to_be32((xdr->p - start - 1) * 4);
2285 }
2286 
2287 static void
2288 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2289 {
2290         struct nfs4_ff_layout_mirror *mirror = opaque->data;
2291 
2292         ff_layout_put_mirror(mirror);
2293 }
2294 
2295 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2296         .encode = ff_layout_encode_layoutstats,
2297         .free   = ff_layout_free_layoutstats,
2298 };
2299 
2300 static int
2301 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2302                                struct nfs42_layoutstat_devinfo *devinfo,
2303                                int dev_limit)
2304 {
2305         struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2306         struct nfs4_ff_layout_mirror *mirror;
2307         struct nfs4_deviceid_node *dev;
2308         int i = 0;
2309 
2310         list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2311                 if (i >= dev_limit)
2312                         break;
2313                 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2314                         continue;
2315                 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2316                         continue;
2317                 /* mirror refcount put in cleanup_layoutstats */
2318                 if (!atomic_inc_not_zero(&mirror->ref))
2319                         continue;
2320                 dev = &mirror->mirror_ds->id_node; 
2321                 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2322                 devinfo->offset = 0;
2323                 devinfo->length = NFS4_MAX_UINT64;
2324                 spin_lock(&mirror->lock);
2325                 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2326                 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2327                 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2328                 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2329                 spin_unlock(&mirror->lock);
2330                 devinfo->layout_type = LAYOUT_FLEX_FILES;
2331                 devinfo->ld_private.ops = &layoutstat_ops;
2332                 devinfo->ld_private.data = mirror;
2333 
2334                 devinfo++;
2335                 i++;
2336         }
2337         return i;
2338 }
2339 
2340 static int
2341 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2342 {
2343         struct nfs4_flexfile_layout *ff_layout;
2344         const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2345 
2346         /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2347         args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
2348         if (!args->devinfo)
2349                 return -ENOMEM;
2350 
2351         spin_lock(&args->inode->i_lock);
2352         ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2353         args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2354                         &args->devinfo[0], dev_count);
2355         spin_unlock(&args->inode->i_lock);
2356         if (!args->num_dev) {
2357                 kfree(args->devinfo);
2358                 args->devinfo = NULL;
2359                 return -ENOENT;
2360         }
2361 
2362         return 0;
2363 }
2364 
2365 static int
2366 ff_layout_set_layoutdriver(struct nfs_server *server,
2367                 const struct nfs_fh *dummy)
2368 {
2369 #if IS_ENABLED(CONFIG_NFS_V4_2)
2370         server->caps |= NFS_CAP_LAYOUTSTATS;
2371 #endif
2372         return 0;
2373 }
2374 
2375 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2376         .id                     = LAYOUT_FLEX_FILES,
2377         .name                   = "LAYOUT_FLEX_FILES",
2378         .owner                  = THIS_MODULE,
2379         .set_layoutdriver       = ff_layout_set_layoutdriver,
2380         .alloc_layout_hdr       = ff_layout_alloc_layout_hdr,
2381         .free_layout_hdr        = ff_layout_free_layout_hdr,
2382         .alloc_lseg             = ff_layout_alloc_lseg,
2383         .free_lseg              = ff_layout_free_lseg,
2384         .add_lseg               = ff_layout_add_lseg,
2385         .pg_read_ops            = &ff_layout_pg_read_ops,
2386         .pg_write_ops           = &ff_layout_pg_write_ops,
2387         .get_ds_info            = ff_layout_get_ds_info,
2388         .free_deviceid_node     = ff_layout_free_deviceid_node,
2389         .mark_request_commit    = pnfs_layout_mark_request_commit,
2390         .clear_request_commit   = pnfs_generic_clear_request_commit,
2391         .scan_commit_lists      = pnfs_generic_scan_commit_lists,
2392         .recover_commit_reqs    = pnfs_generic_recover_commit_reqs,
2393         .commit_pagelist        = ff_layout_commit_pagelist,
2394         .read_pagelist          = ff_layout_read_pagelist,
2395         .write_pagelist         = ff_layout_write_pagelist,
2396         .alloc_deviceid_node    = ff_layout_alloc_deviceid_node,
2397         .prepare_layoutreturn   = ff_layout_prepare_layoutreturn,
2398         .sync                   = pnfs_nfs_generic_sync,
2399         .prepare_layoutstats    = ff_layout_prepare_layoutstats,
2400 };
2401 
2402 static int __init nfs4flexfilelayout_init(void)
2403 {
2404         printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2405                __func__);
2406         if (!ff_zero_group) {
2407                 ff_zero_group = groups_alloc(0);
2408                 if (!ff_zero_group)
2409                         return -ENOMEM;
2410         }
2411         return pnfs_register_layoutdriver(&flexfilelayout_type);
2412 }
2413 
2414 static void __exit nfs4flexfilelayout_exit(void)
2415 {
2416         printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2417                __func__);
2418         pnfs_unregister_layoutdriver(&flexfilelayout_type);
2419         if (ff_zero_group) {
2420                 put_group_info(ff_zero_group);
2421                 ff_zero_group = NULL;
2422         }
2423 }
2424 
2425 MODULE_ALIAS("nfs-layouttype4-4");
2426 
2427 MODULE_LICENSE("GPL");
2428 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2429 
2430 module_init(nfs4flexfilelayout_init);
2431 module_exit(nfs4flexfilelayout_exit);
2432 

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