xref: /linux/fs/nfs/flexfilelayout/flexfilelayout.c (revision dec1c62e91ba268ab2a6e339d4d7a59287d5eba1)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Module for pnfs flexfile layout driver.
4  *
5  * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
6  *
7  * Tao Peng <bergwolf@primarydata.com>
8  */
9 
10 #include <linux/nfs_fs.h>
11 #include <linux/nfs_mount.h>
12 #include <linux/nfs_page.h>
13 #include <linux/module.h>
14 #include <linux/sched/mm.h>
15 
16 #include <linux/sunrpc/metrics.h>
17 
18 #include "flexfilelayout.h"
19 #include "../nfs4session.h"
20 #include "../nfs4idmap.h"
21 #include "../internal.h"
22 #include "../delegation.h"
23 #include "../nfs4trace.h"
24 #include "../iostat.h"
25 #include "../nfs.h"
26 #include "../nfs42.h"
27 
28 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
29 
30 #define FF_LAYOUT_POLL_RETRY_MAX     (15*HZ)
31 #define FF_LAYOUTRETURN_MAXERR 20
32 
33 static unsigned short io_maxretrans;
34 
35 static const struct pnfs_commit_ops ff_layout_commit_ops;
36 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
37 		struct nfs_pgio_header *hdr);
38 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
39 			       struct nfs42_layoutstat_devinfo *devinfo,
40 			       int dev_limit);
41 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
42 			      const struct nfs42_layoutstat_devinfo *devinfo,
43 			      struct nfs4_ff_layout_mirror *mirror);
44 
45 static struct pnfs_layout_hdr *
46 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
47 {
48 	struct nfs4_flexfile_layout *ffl;
49 
50 	ffl = kzalloc(sizeof(*ffl), gfp_flags);
51 	if (ffl) {
52 		pnfs_init_ds_commit_info(&ffl->commit_info);
53 		INIT_LIST_HEAD(&ffl->error_list);
54 		INIT_LIST_HEAD(&ffl->mirrors);
55 		ffl->last_report_time = ktime_get();
56 		ffl->commit_info.ops = &ff_layout_commit_ops;
57 		return &ffl->generic_hdr;
58 	} else
59 		return NULL;
60 }
61 
62 static void
63 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
64 {
65 	struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo);
66 	struct nfs4_ff_layout_ds_err *err, *n;
67 
68 	list_for_each_entry_safe(err, n, &ffl->error_list, list) {
69 		list_del(&err->list);
70 		kfree(err);
71 	}
72 	kfree_rcu(ffl, generic_hdr.plh_rcu);
73 }
74 
75 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
76 {
77 	__be32 *p;
78 
79 	p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
80 	if (unlikely(p == NULL))
81 		return -ENOBUFS;
82 	stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
83 	memcpy(stateid->data, p, NFS4_STATEID_SIZE);
84 	dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
85 		p[0], p[1], p[2], p[3]);
86 	return 0;
87 }
88 
89 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
90 {
91 	__be32 *p;
92 
93 	p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
94 	if (unlikely(!p))
95 		return -ENOBUFS;
96 	memcpy(devid, p, NFS4_DEVICEID4_SIZE);
97 	nfs4_print_deviceid(devid);
98 	return 0;
99 }
100 
101 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
102 {
103 	__be32 *p;
104 
105 	p = xdr_inline_decode(xdr, 4);
106 	if (unlikely(!p))
107 		return -ENOBUFS;
108 	fh->size = be32_to_cpup(p++);
109 	if (fh->size > NFS_MAXFHSIZE) {
110 		printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
111 		       fh->size);
112 		return -EOVERFLOW;
113 	}
114 	/* fh.data */
115 	p = xdr_inline_decode(xdr, fh->size);
116 	if (unlikely(!p))
117 		return -ENOBUFS;
118 	memcpy(&fh->data, p, fh->size);
119 	dprintk("%s: fh len %d\n", __func__, fh->size);
120 
121 	return 0;
122 }
123 
124 /*
125  * Currently only stringified uids and gids are accepted.
126  * I.e., kerberos is not supported to the DSes, so no pricipals.
127  *
128  * That means that one common function will suffice, but when
129  * principals are added, this should be split to accomodate
130  * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
131  */
132 static int
133 decode_name(struct xdr_stream *xdr, u32 *id)
134 {
135 	__be32 *p;
136 	int len;
137 
138 	/* opaque_length(4)*/
139 	p = xdr_inline_decode(xdr, 4);
140 	if (unlikely(!p))
141 		return -ENOBUFS;
142 	len = be32_to_cpup(p++);
143 	if (len < 0)
144 		return -EINVAL;
145 
146 	dprintk("%s: len %u\n", __func__, len);
147 
148 	/* opaque body */
149 	p = xdr_inline_decode(xdr, len);
150 	if (unlikely(!p))
151 		return -ENOBUFS;
152 
153 	if (!nfs_map_string_to_numeric((char *)p, len, id))
154 		return -EINVAL;
155 
156 	return 0;
157 }
158 
159 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
160 		const struct nfs4_ff_layout_mirror *m2)
161 {
162 	int i, j;
163 
164 	if (m1->fh_versions_cnt != m2->fh_versions_cnt)
165 		return false;
166 	for (i = 0; i < m1->fh_versions_cnt; i++) {
167 		bool found_fh = false;
168 		for (j = 0; j < m2->fh_versions_cnt; j++) {
169 			if (nfs_compare_fh(&m1->fh_versions[i],
170 					&m2->fh_versions[j]) == 0) {
171 				found_fh = true;
172 				break;
173 			}
174 		}
175 		if (!found_fh)
176 			return false;
177 	}
178 	return true;
179 }
180 
181 static struct nfs4_ff_layout_mirror *
182 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
183 		struct nfs4_ff_layout_mirror *mirror)
184 {
185 	struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
186 	struct nfs4_ff_layout_mirror *pos;
187 	struct inode *inode = lo->plh_inode;
188 
189 	spin_lock(&inode->i_lock);
190 	list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
191 		if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
192 			continue;
193 		if (!ff_mirror_match_fh(mirror, pos))
194 			continue;
195 		if (refcount_inc_not_zero(&pos->ref)) {
196 			spin_unlock(&inode->i_lock);
197 			return pos;
198 		}
199 	}
200 	list_add(&mirror->mirrors, &ff_layout->mirrors);
201 	mirror->layout = lo;
202 	spin_unlock(&inode->i_lock);
203 	return mirror;
204 }
205 
206 static void
207 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
208 {
209 	struct inode *inode;
210 	if (mirror->layout == NULL)
211 		return;
212 	inode = mirror->layout->plh_inode;
213 	spin_lock(&inode->i_lock);
214 	list_del(&mirror->mirrors);
215 	spin_unlock(&inode->i_lock);
216 	mirror->layout = NULL;
217 }
218 
219 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
220 {
221 	struct nfs4_ff_layout_mirror *mirror;
222 
223 	mirror = kzalloc(sizeof(*mirror), gfp_flags);
224 	if (mirror != NULL) {
225 		spin_lock_init(&mirror->lock);
226 		refcount_set(&mirror->ref, 1);
227 		INIT_LIST_HEAD(&mirror->mirrors);
228 	}
229 	return mirror;
230 }
231 
232 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
233 {
234 	const struct cred	*cred;
235 
236 	ff_layout_remove_mirror(mirror);
237 	kfree(mirror->fh_versions);
238 	cred = rcu_access_pointer(mirror->ro_cred);
239 	put_cred(cred);
240 	cred = rcu_access_pointer(mirror->rw_cred);
241 	put_cred(cred);
242 	nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
243 	kfree(mirror);
244 }
245 
246 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
247 {
248 	if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
249 		ff_layout_free_mirror(mirror);
250 }
251 
252 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
253 {
254 	u32 i;
255 
256 	for (i = 0; i < fls->mirror_array_cnt; i++)
257 		ff_layout_put_mirror(fls->mirror_array[i]);
258 }
259 
260 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
261 {
262 	if (fls) {
263 		ff_layout_free_mirror_array(fls);
264 		kfree(fls);
265 	}
266 }
267 
268 static bool
269 ff_lseg_match_mirrors(struct pnfs_layout_segment *l1,
270 		struct pnfs_layout_segment *l2)
271 {
272 	const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1);
273 	const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1);
274 	u32 i;
275 
276 	if (fl1->mirror_array_cnt != fl2->mirror_array_cnt)
277 		return false;
278 	for (i = 0; i < fl1->mirror_array_cnt; i++) {
279 		if (fl1->mirror_array[i] != fl2->mirror_array[i])
280 			return false;
281 	}
282 	return true;
283 }
284 
285 static bool
286 ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
287 		const struct pnfs_layout_range *l2)
288 {
289 	u64 end1, end2;
290 
291 	if (l1->iomode != l2->iomode)
292 		return l1->iomode != IOMODE_READ;
293 	end1 = pnfs_calc_offset_end(l1->offset, l1->length);
294 	end2 = pnfs_calc_offset_end(l2->offset, l2->length);
295 	if (end1 < l2->offset)
296 		return false;
297 	if (end2 < l1->offset)
298 		return true;
299 	return l2->offset <= l1->offset;
300 }
301 
302 static bool
303 ff_lseg_merge(struct pnfs_layout_segment *new,
304 		struct pnfs_layout_segment *old)
305 {
306 	u64 new_end, old_end;
307 
308 	if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
309 		return false;
310 	if (new->pls_range.iomode != old->pls_range.iomode)
311 		return false;
312 	old_end = pnfs_calc_offset_end(old->pls_range.offset,
313 			old->pls_range.length);
314 	if (old_end < new->pls_range.offset)
315 		return false;
316 	new_end = pnfs_calc_offset_end(new->pls_range.offset,
317 			new->pls_range.length);
318 	if (new_end < old->pls_range.offset)
319 		return false;
320 	if (!ff_lseg_match_mirrors(new, old))
321 		return false;
322 
323 	/* Mergeable: copy info from 'old' to 'new' */
324 	if (new_end < old_end)
325 		new_end = old_end;
326 	if (new->pls_range.offset < old->pls_range.offset)
327 		new->pls_range.offset = old->pls_range.offset;
328 	new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
329 			new_end);
330 	if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
331 		set_bit(NFS_LSEG_ROC, &new->pls_flags);
332 	return true;
333 }
334 
335 static void
336 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
337 		struct pnfs_layout_segment *lseg,
338 		struct list_head *free_me)
339 {
340 	pnfs_generic_layout_insert_lseg(lo, lseg,
341 			ff_lseg_range_is_after,
342 			ff_lseg_merge,
343 			free_me);
344 }
345 
346 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
347 {
348 	int i, j;
349 
350 	for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
351 		for (j = i + 1; j < fls->mirror_array_cnt; j++)
352 			if (fls->mirror_array[i]->efficiency <
353 			    fls->mirror_array[j]->efficiency)
354 				swap(fls->mirror_array[i],
355 				     fls->mirror_array[j]);
356 	}
357 }
358 
359 static struct pnfs_layout_segment *
360 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
361 		     struct nfs4_layoutget_res *lgr,
362 		     gfp_t gfp_flags)
363 {
364 	struct pnfs_layout_segment *ret;
365 	struct nfs4_ff_layout_segment *fls = NULL;
366 	struct xdr_stream stream;
367 	struct xdr_buf buf;
368 	struct page *scratch;
369 	u64 stripe_unit;
370 	u32 mirror_array_cnt;
371 	__be32 *p;
372 	int i, rc;
373 
374 	dprintk("--> %s\n", __func__);
375 	scratch = alloc_page(gfp_flags);
376 	if (!scratch)
377 		return ERR_PTR(-ENOMEM);
378 
379 	xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
380 			      lgr->layoutp->len);
381 	xdr_set_scratch_page(&stream, scratch);
382 
383 	/* stripe unit and mirror_array_cnt */
384 	rc = -EIO;
385 	p = xdr_inline_decode(&stream, 8 + 4);
386 	if (!p)
387 		goto out_err_free;
388 
389 	p = xdr_decode_hyper(p, &stripe_unit);
390 	mirror_array_cnt = be32_to_cpup(p++);
391 	dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
392 		stripe_unit, mirror_array_cnt);
393 
394 	if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
395 	    mirror_array_cnt == 0)
396 		goto out_err_free;
397 
398 	rc = -ENOMEM;
399 	fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt),
400 			gfp_flags);
401 	if (!fls)
402 		goto out_err_free;
403 
404 	fls->mirror_array_cnt = mirror_array_cnt;
405 	fls->stripe_unit = stripe_unit;
406 
407 	for (i = 0; i < fls->mirror_array_cnt; i++) {
408 		struct nfs4_ff_layout_mirror *mirror;
409 		struct cred *kcred;
410 		const struct cred __rcu *cred;
411 		kuid_t uid;
412 		kgid_t gid;
413 		u32 ds_count, fh_count, id;
414 		int j;
415 
416 		rc = -EIO;
417 		p = xdr_inline_decode(&stream, 4);
418 		if (!p)
419 			goto out_err_free;
420 		ds_count = be32_to_cpup(p);
421 
422 		/* FIXME: allow for striping? */
423 		if (ds_count != 1)
424 			goto out_err_free;
425 
426 		fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
427 		if (fls->mirror_array[i] == NULL) {
428 			rc = -ENOMEM;
429 			goto out_err_free;
430 		}
431 
432 		fls->mirror_array[i]->ds_count = ds_count;
433 
434 		/* deviceid */
435 		rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
436 		if (rc)
437 			goto out_err_free;
438 
439 		/* efficiency */
440 		rc = -EIO;
441 		p = xdr_inline_decode(&stream, 4);
442 		if (!p)
443 			goto out_err_free;
444 		fls->mirror_array[i]->efficiency = be32_to_cpup(p);
445 
446 		/* stateid */
447 		rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
448 		if (rc)
449 			goto out_err_free;
450 
451 		/* fh */
452 		rc = -EIO;
453 		p = xdr_inline_decode(&stream, 4);
454 		if (!p)
455 			goto out_err_free;
456 		fh_count = be32_to_cpup(p);
457 
458 		fls->mirror_array[i]->fh_versions =
459 			kcalloc(fh_count, sizeof(struct nfs_fh),
460 				gfp_flags);
461 		if (fls->mirror_array[i]->fh_versions == NULL) {
462 			rc = -ENOMEM;
463 			goto out_err_free;
464 		}
465 
466 		for (j = 0; j < fh_count; j++) {
467 			rc = decode_nfs_fh(&stream,
468 					   &fls->mirror_array[i]->fh_versions[j]);
469 			if (rc)
470 				goto out_err_free;
471 		}
472 
473 		fls->mirror_array[i]->fh_versions_cnt = fh_count;
474 
475 		/* user */
476 		rc = decode_name(&stream, &id);
477 		if (rc)
478 			goto out_err_free;
479 
480 		uid = make_kuid(&init_user_ns, id);
481 
482 		/* group */
483 		rc = decode_name(&stream, &id);
484 		if (rc)
485 			goto out_err_free;
486 
487 		gid = make_kgid(&init_user_ns, id);
488 
489 		if (gfp_flags & __GFP_FS)
490 			kcred = prepare_kernel_cred(NULL);
491 		else {
492 			unsigned int nofs_flags = memalloc_nofs_save();
493 			kcred = prepare_kernel_cred(NULL);
494 			memalloc_nofs_restore(nofs_flags);
495 		}
496 		rc = -ENOMEM;
497 		if (!kcred)
498 			goto out_err_free;
499 		kcred->fsuid = uid;
500 		kcred->fsgid = gid;
501 		cred = RCU_INITIALIZER(kcred);
502 
503 		if (lgr->range.iomode == IOMODE_READ)
504 			rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
505 		else
506 			rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
507 
508 		mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
509 		if (mirror != fls->mirror_array[i]) {
510 			/* swap cred ptrs so free_mirror will clean up old */
511 			if (lgr->range.iomode == IOMODE_READ) {
512 				cred = xchg(&mirror->ro_cred, cred);
513 				rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
514 			} else {
515 				cred = xchg(&mirror->rw_cred, cred);
516 				rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
517 			}
518 			ff_layout_free_mirror(fls->mirror_array[i]);
519 			fls->mirror_array[i] = mirror;
520 		}
521 
522 		dprintk("%s: iomode %s uid %u gid %u\n", __func__,
523 			lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
524 			from_kuid(&init_user_ns, uid),
525 			from_kgid(&init_user_ns, gid));
526 	}
527 
528 	p = xdr_inline_decode(&stream, 4);
529 	if (!p)
530 		goto out_sort_mirrors;
531 	fls->flags = be32_to_cpup(p);
532 
533 	p = xdr_inline_decode(&stream, 4);
534 	if (!p)
535 		goto out_sort_mirrors;
536 	for (i=0; i < fls->mirror_array_cnt; i++)
537 		fls->mirror_array[i]->report_interval = be32_to_cpup(p);
538 
539 out_sort_mirrors:
540 	ff_layout_sort_mirrors(fls);
541 	ret = &fls->generic_hdr;
542 	dprintk("<-- %s (success)\n", __func__);
543 out_free_page:
544 	__free_page(scratch);
545 	return ret;
546 out_err_free:
547 	_ff_layout_free_lseg(fls);
548 	ret = ERR_PTR(rc);
549 	dprintk("<-- %s (%d)\n", __func__, rc);
550 	goto out_free_page;
551 }
552 
553 static void
554 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
555 {
556 	struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
557 
558 	dprintk("--> %s\n", __func__);
559 
560 	if (lseg->pls_range.iomode == IOMODE_RW) {
561 		struct nfs4_flexfile_layout *ffl;
562 		struct inode *inode;
563 
564 		ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
565 		inode = ffl->generic_hdr.plh_inode;
566 		spin_lock(&inode->i_lock);
567 		pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg);
568 		spin_unlock(&inode->i_lock);
569 	}
570 	_ff_layout_free_lseg(fls);
571 }
572 
573 static void
574 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
575 {
576 	/* first IO request? */
577 	if (atomic_inc_return(&timer->n_ops) == 1) {
578 		timer->start_time = now;
579 	}
580 }
581 
582 static ktime_t
583 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
584 {
585 	ktime_t start;
586 
587 	if (atomic_dec_return(&timer->n_ops) < 0)
588 		WARN_ON_ONCE(1);
589 
590 	start = timer->start_time;
591 	timer->start_time = now;
592 	return ktime_sub(now, start);
593 }
594 
595 static bool
596 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
597 			    struct nfs4_ff_layoutstat *layoutstat,
598 			    ktime_t now)
599 {
600 	s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
601 	struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
602 
603 	nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
604 	if (!mirror->start_time)
605 		mirror->start_time = now;
606 	if (mirror->report_interval != 0)
607 		report_interval = (s64)mirror->report_interval * 1000LL;
608 	else if (layoutstats_timer != 0)
609 		report_interval = (s64)layoutstats_timer * 1000LL;
610 	if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
611 			report_interval) {
612 		ffl->last_report_time = now;
613 		return true;
614 	}
615 
616 	return false;
617 }
618 
619 static void
620 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
621 		__u64 requested)
622 {
623 	struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
624 
625 	iostat->ops_requested++;
626 	iostat->bytes_requested += requested;
627 }
628 
629 static void
630 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
631 		__u64 requested,
632 		__u64 completed,
633 		ktime_t time_completed,
634 		ktime_t time_started)
635 {
636 	struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
637 	ktime_t completion_time = ktime_sub(time_completed, time_started);
638 	ktime_t timer;
639 
640 	iostat->ops_completed++;
641 	iostat->bytes_completed += completed;
642 	iostat->bytes_not_delivered += requested - completed;
643 
644 	timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
645 	iostat->total_busy_time =
646 			ktime_add(iostat->total_busy_time, timer);
647 	iostat->aggregate_completion_time =
648 			ktime_add(iostat->aggregate_completion_time,
649 					completion_time);
650 }
651 
652 static void
653 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
654 		struct nfs4_ff_layout_mirror *mirror,
655 		__u64 requested, ktime_t now)
656 {
657 	bool report;
658 
659 	spin_lock(&mirror->lock);
660 	report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
661 	nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
662 	set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
663 	spin_unlock(&mirror->lock);
664 
665 	if (report)
666 		pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
667 }
668 
669 static void
670 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
671 		struct nfs4_ff_layout_mirror *mirror,
672 		__u64 requested,
673 		__u64 completed)
674 {
675 	spin_lock(&mirror->lock);
676 	nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
677 			requested, completed,
678 			ktime_get(), task->tk_start);
679 	set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
680 	spin_unlock(&mirror->lock);
681 }
682 
683 static void
684 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
685 		struct nfs4_ff_layout_mirror *mirror,
686 		__u64 requested, ktime_t now)
687 {
688 	bool report;
689 
690 	spin_lock(&mirror->lock);
691 	report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
692 	nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
693 	set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
694 	spin_unlock(&mirror->lock);
695 
696 	if (report)
697 		pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
698 }
699 
700 static void
701 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
702 		struct nfs4_ff_layout_mirror *mirror,
703 		__u64 requested,
704 		__u64 completed,
705 		enum nfs3_stable_how committed)
706 {
707 	if (committed == NFS_UNSTABLE)
708 		requested = completed = 0;
709 
710 	spin_lock(&mirror->lock);
711 	nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
712 			requested, completed, ktime_get(), task->tk_start);
713 	set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
714 	spin_unlock(&mirror->lock);
715 }
716 
717 static void
718 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx)
719 {
720 	struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
721 
722 	if (devid)
723 		nfs4_mark_deviceid_unavailable(devid);
724 }
725 
726 static void
727 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx)
728 {
729 	struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
730 
731 	if (devid)
732 		nfs4_mark_deviceid_available(devid);
733 }
734 
735 static struct nfs4_pnfs_ds *
736 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
737 			     u32 start_idx, u32 *best_idx,
738 			     bool check_device)
739 {
740 	struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
741 	struct nfs4_ff_layout_mirror *mirror;
742 	struct nfs4_pnfs_ds *ds;
743 	u32 idx;
744 
745 	/* mirrors are initially sorted by efficiency */
746 	for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
747 		mirror = FF_LAYOUT_COMP(lseg, idx);
748 		ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
749 		if (!ds)
750 			continue;
751 
752 		if (check_device &&
753 		    nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
754 			continue;
755 
756 		*best_idx = idx;
757 		return ds;
758 	}
759 
760 	return NULL;
761 }
762 
763 static struct nfs4_pnfs_ds *
764 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
765 				 u32 start_idx, u32 *best_idx)
766 {
767 	return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
768 }
769 
770 static struct nfs4_pnfs_ds *
771 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
772 				   u32 start_idx, u32 *best_idx)
773 {
774 	return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
775 }
776 
777 static struct nfs4_pnfs_ds *
778 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
779 				  u32 start_idx, u32 *best_idx)
780 {
781 	struct nfs4_pnfs_ds *ds;
782 
783 	ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
784 	if (ds)
785 		return ds;
786 	return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
787 }
788 
789 static struct nfs4_pnfs_ds *
790 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
791 			  u32 *best_idx)
792 {
793 	struct pnfs_layout_segment *lseg = pgio->pg_lseg;
794 	struct nfs4_pnfs_ds *ds;
795 
796 	ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx,
797 					       best_idx);
798 	if (ds || !pgio->pg_mirror_idx)
799 		return ds;
800 	return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx);
801 }
802 
803 static void
804 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
805 		      struct nfs_page *req,
806 		      bool strict_iomode)
807 {
808 	pnfs_put_lseg(pgio->pg_lseg);
809 	pgio->pg_lseg =
810 		pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
811 				   req_offset(req), req->wb_bytes, IOMODE_READ,
812 				   strict_iomode, nfs_io_gfp_mask());
813 	if (IS_ERR(pgio->pg_lseg)) {
814 		pgio->pg_error = PTR_ERR(pgio->pg_lseg);
815 		pgio->pg_lseg = NULL;
816 	}
817 }
818 
819 static void
820 ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio,
821 			  struct nfs_page *req)
822 {
823 	pnfs_generic_pg_check_layout(pgio);
824 	pnfs_generic_pg_check_range(pgio, req);
825 }
826 
827 static void
828 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
829 			struct nfs_page *req)
830 {
831 	struct nfs_pgio_mirror *pgm;
832 	struct nfs4_ff_layout_mirror *mirror;
833 	struct nfs4_pnfs_ds *ds;
834 	u32 ds_idx;
835 
836 retry:
837 	ff_layout_pg_check_layout(pgio, req);
838 	/* Use full layout for now */
839 	if (!pgio->pg_lseg) {
840 		ff_layout_pg_get_read(pgio, req, false);
841 		if (!pgio->pg_lseg)
842 			goto out_nolseg;
843 	}
844 	if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
845 		ff_layout_pg_get_read(pgio, req, true);
846 		if (!pgio->pg_lseg)
847 			goto out_nolseg;
848 	}
849 
850 	ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
851 	if (!ds) {
852 		if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
853 			goto out_mds;
854 		pnfs_generic_pg_cleanup(pgio);
855 		/* Sleep for 1 second before retrying */
856 		ssleep(1);
857 		goto retry;
858 	}
859 
860 	mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
861 	pgm = &pgio->pg_mirrors[0];
862 	pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
863 
864 	pgio->pg_mirror_idx = ds_idx;
865 
866 	if (NFS_SERVER(pgio->pg_inode)->flags &
867 			(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
868 		pgio->pg_maxretrans = io_maxretrans;
869 	return;
870 out_nolseg:
871 	if (pgio->pg_error < 0)
872 		return;
873 out_mds:
874 	trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
875 			0, NFS4_MAX_UINT64, IOMODE_READ,
876 			NFS_I(pgio->pg_inode)->layout,
877 			pgio->pg_lseg);
878 	pgio->pg_maxretrans = 0;
879 	nfs_pageio_reset_read_mds(pgio);
880 }
881 
882 static void
883 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
884 			struct nfs_page *req)
885 {
886 	struct nfs4_ff_layout_mirror *mirror;
887 	struct nfs_pgio_mirror *pgm;
888 	struct nfs4_pnfs_ds *ds;
889 	u32 i;
890 
891 retry:
892 	ff_layout_pg_check_layout(pgio, req);
893 	if (!pgio->pg_lseg) {
894 		pgio->pg_lseg =
895 			pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
896 					   req_offset(req), req->wb_bytes,
897 					   IOMODE_RW, false, nfs_io_gfp_mask());
898 		if (IS_ERR(pgio->pg_lseg)) {
899 			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
900 			pgio->pg_lseg = NULL;
901 			return;
902 		}
903 	}
904 	/* If no lseg, fall back to write through mds */
905 	if (pgio->pg_lseg == NULL)
906 		goto out_mds;
907 
908 	/* Use a direct mapping of ds_idx to pgio mirror_idx */
909 	if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
910 		goto out_eagain;
911 
912 	for (i = 0; i < pgio->pg_mirror_count; i++) {
913 		mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
914 		ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
915 		if (!ds) {
916 			if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
917 				goto out_mds;
918 			pnfs_generic_pg_cleanup(pgio);
919 			/* Sleep for 1 second before retrying */
920 			ssleep(1);
921 			goto retry;
922 		}
923 		pgm = &pgio->pg_mirrors[i];
924 		pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
925 	}
926 
927 	if (NFS_SERVER(pgio->pg_inode)->flags &
928 			(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
929 		pgio->pg_maxretrans = io_maxretrans;
930 	return;
931 out_eagain:
932 	pnfs_generic_pg_cleanup(pgio);
933 	pgio->pg_error = -EAGAIN;
934 	return;
935 out_mds:
936 	trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
937 			0, NFS4_MAX_UINT64, IOMODE_RW,
938 			NFS_I(pgio->pg_inode)->layout,
939 			pgio->pg_lseg);
940 	pgio->pg_maxretrans = 0;
941 	nfs_pageio_reset_write_mds(pgio);
942 	pgio->pg_error = -EAGAIN;
943 }
944 
945 static unsigned int
946 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
947 				    struct nfs_page *req)
948 {
949 	if (!pgio->pg_lseg) {
950 		pgio->pg_lseg =
951 			pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
952 					   req_offset(req), req->wb_bytes,
953 					   IOMODE_RW, false, nfs_io_gfp_mask());
954 		if (IS_ERR(pgio->pg_lseg)) {
955 			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
956 			pgio->pg_lseg = NULL;
957 			goto out;
958 		}
959 	}
960 	if (pgio->pg_lseg)
961 		return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
962 
963 	trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
964 			0, NFS4_MAX_UINT64, IOMODE_RW,
965 			NFS_I(pgio->pg_inode)->layout,
966 			pgio->pg_lseg);
967 	/* no lseg means that pnfs is not in use, so no mirroring here */
968 	nfs_pageio_reset_write_mds(pgio);
969 out:
970 	return 1;
971 }
972 
973 static u32
974 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
975 {
976 	u32 old = desc->pg_mirror_idx;
977 
978 	desc->pg_mirror_idx = idx;
979 	return old;
980 }
981 
982 static struct nfs_pgio_mirror *
983 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
984 {
985 	return &desc->pg_mirrors[idx];
986 }
987 
988 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
989 	.pg_init = ff_layout_pg_init_read,
990 	.pg_test = pnfs_generic_pg_test,
991 	.pg_doio = pnfs_generic_pg_readpages,
992 	.pg_cleanup = pnfs_generic_pg_cleanup,
993 };
994 
995 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
996 	.pg_init = ff_layout_pg_init_write,
997 	.pg_test = pnfs_generic_pg_test,
998 	.pg_doio = pnfs_generic_pg_writepages,
999 	.pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1000 	.pg_cleanup = pnfs_generic_pg_cleanup,
1001 	.pg_get_mirror = ff_layout_pg_get_mirror_write,
1002 	.pg_set_mirror = ff_layout_pg_set_mirror_write,
1003 };
1004 
1005 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1006 {
1007 	struct rpc_task *task = &hdr->task;
1008 
1009 	pnfs_layoutcommit_inode(hdr->inode, false);
1010 
1011 	if (retry_pnfs) {
1012 		dprintk("%s Reset task %5u for i/o through pNFS "
1013 			"(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1014 			hdr->task.tk_pid,
1015 			hdr->inode->i_sb->s_id,
1016 			(unsigned long long)NFS_FILEID(hdr->inode),
1017 			hdr->args.count,
1018 			(unsigned long long)hdr->args.offset);
1019 
1020 		hdr->completion_ops->reschedule_io(hdr);
1021 		return;
1022 	}
1023 
1024 	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1025 		dprintk("%s Reset task %5u for i/o through MDS "
1026 			"(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1027 			hdr->task.tk_pid,
1028 			hdr->inode->i_sb->s_id,
1029 			(unsigned long long)NFS_FILEID(hdr->inode),
1030 			hdr->args.count,
1031 			(unsigned long long)hdr->args.offset);
1032 
1033 		trace_pnfs_mds_fallback_write_done(hdr->inode,
1034 				hdr->args.offset, hdr->args.count,
1035 				IOMODE_RW, NFS_I(hdr->inode)->layout,
1036 				hdr->lseg);
1037 		task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1038 	}
1039 }
1040 
1041 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr)
1042 {
1043 	u32 idx = hdr->pgio_mirror_idx + 1;
1044 	u32 new_idx = 0;
1045 
1046 	if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx))
1047 		ff_layout_send_layouterror(hdr->lseg);
1048 	else
1049 		pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1050 	pnfs_read_resend_pnfs(hdr, new_idx);
1051 }
1052 
1053 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1054 {
1055 	struct rpc_task *task = &hdr->task;
1056 
1057 	pnfs_layoutcommit_inode(hdr->inode, false);
1058 	pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1059 
1060 	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1061 		dprintk("%s Reset task %5u for i/o through MDS "
1062 			"(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1063 			hdr->task.tk_pid,
1064 			hdr->inode->i_sb->s_id,
1065 			(unsigned long long)NFS_FILEID(hdr->inode),
1066 			hdr->args.count,
1067 			(unsigned long long)hdr->args.offset);
1068 
1069 		trace_pnfs_mds_fallback_read_done(hdr->inode,
1070 				hdr->args.offset, hdr->args.count,
1071 				IOMODE_READ, NFS_I(hdr->inode)->layout,
1072 				hdr->lseg);
1073 		task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1074 	}
1075 }
1076 
1077 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1078 					   struct nfs4_state *state,
1079 					   struct nfs_client *clp,
1080 					   struct pnfs_layout_segment *lseg,
1081 					   u32 idx)
1082 {
1083 	struct pnfs_layout_hdr *lo = lseg->pls_layout;
1084 	struct inode *inode = lo->plh_inode;
1085 	struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1086 	struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1087 
1088 	switch (task->tk_status) {
1089 	case -NFS4ERR_BADSESSION:
1090 	case -NFS4ERR_BADSLOT:
1091 	case -NFS4ERR_BAD_HIGH_SLOT:
1092 	case -NFS4ERR_DEADSESSION:
1093 	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1094 	case -NFS4ERR_SEQ_FALSE_RETRY:
1095 	case -NFS4ERR_SEQ_MISORDERED:
1096 		dprintk("%s ERROR %d, Reset session. Exchangeid "
1097 			"flags 0x%x\n", __func__, task->tk_status,
1098 			clp->cl_exchange_flags);
1099 		nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1100 		break;
1101 	case -NFS4ERR_DELAY:
1102 	case -NFS4ERR_GRACE:
1103 		rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1104 		break;
1105 	case -NFS4ERR_RETRY_UNCACHED_REP:
1106 		break;
1107 	/* Invalidate Layout errors */
1108 	case -NFS4ERR_PNFS_NO_LAYOUT:
1109 	case -ESTALE:           /* mapped NFS4ERR_STALE */
1110 	case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
1111 	case -EISDIR:           /* mapped NFS4ERR_ISDIR */
1112 	case -NFS4ERR_FHEXPIRED:
1113 	case -NFS4ERR_WRONG_TYPE:
1114 		dprintk("%s Invalid layout error %d\n", __func__,
1115 			task->tk_status);
1116 		/*
1117 		 * Destroy layout so new i/o will get a new layout.
1118 		 * Layout will not be destroyed until all current lseg
1119 		 * references are put. Mark layout as invalid to resend failed
1120 		 * i/o and all i/o waiting on the slot table to the MDS until
1121 		 * layout is destroyed and a new valid layout is obtained.
1122 		 */
1123 		pnfs_destroy_layout(NFS_I(inode));
1124 		rpc_wake_up(&tbl->slot_tbl_waitq);
1125 		goto reset;
1126 	/* RPC connection errors */
1127 	case -ECONNREFUSED:
1128 	case -EHOSTDOWN:
1129 	case -EHOSTUNREACH:
1130 	case -ENETUNREACH:
1131 	case -EIO:
1132 	case -ETIMEDOUT:
1133 	case -EPIPE:
1134 		dprintk("%s DS connection error %d\n", __func__,
1135 			task->tk_status);
1136 		nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1137 				&devid->deviceid);
1138 		rpc_wake_up(&tbl->slot_tbl_waitq);
1139 		fallthrough;
1140 	default:
1141 		if (ff_layout_avoid_mds_available_ds(lseg))
1142 			return -NFS4ERR_RESET_TO_PNFS;
1143 reset:
1144 		dprintk("%s Retry through MDS. Error %d\n", __func__,
1145 			task->tk_status);
1146 		return -NFS4ERR_RESET_TO_MDS;
1147 	}
1148 	task->tk_status = 0;
1149 	return -EAGAIN;
1150 }
1151 
1152 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1153 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1154 					   struct pnfs_layout_segment *lseg,
1155 					   u32 idx)
1156 {
1157 	struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1158 
1159 	switch (task->tk_status) {
1160 	/* File access problems. Don't mark the device as unavailable */
1161 	case -EACCES:
1162 	case -ESTALE:
1163 	case -EISDIR:
1164 	case -EBADHANDLE:
1165 	case -ELOOP:
1166 	case -ENOSPC:
1167 		break;
1168 	case -EJUKEBOX:
1169 		nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1170 		goto out_retry;
1171 	default:
1172 		dprintk("%s DS connection error %d\n", __func__,
1173 			task->tk_status);
1174 		nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1175 				&devid->deviceid);
1176 	}
1177 	/* FIXME: Need to prevent infinite looping here. */
1178 	return -NFS4ERR_RESET_TO_PNFS;
1179 out_retry:
1180 	task->tk_status = 0;
1181 	rpc_restart_call_prepare(task);
1182 	rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1183 	return -EAGAIN;
1184 }
1185 
1186 static int ff_layout_async_handle_error(struct rpc_task *task,
1187 					struct nfs4_state *state,
1188 					struct nfs_client *clp,
1189 					struct pnfs_layout_segment *lseg,
1190 					u32 idx)
1191 {
1192 	int vers = clp->cl_nfs_mod->rpc_vers->number;
1193 
1194 	if (task->tk_status >= 0) {
1195 		ff_layout_mark_ds_reachable(lseg, idx);
1196 		return 0;
1197 	}
1198 
1199 	/* Handle the case of an invalid layout segment */
1200 	if (!pnfs_is_valid_lseg(lseg))
1201 		return -NFS4ERR_RESET_TO_PNFS;
1202 
1203 	switch (vers) {
1204 	case 3:
1205 		return ff_layout_async_handle_error_v3(task, lseg, idx);
1206 	case 4:
1207 		return ff_layout_async_handle_error_v4(task, state, clp,
1208 						       lseg, idx);
1209 	default:
1210 		/* should never happen */
1211 		WARN_ON_ONCE(1);
1212 		return 0;
1213 	}
1214 }
1215 
1216 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1217 					u32 idx, u64 offset, u64 length,
1218 					u32 *op_status, int opnum, int error)
1219 {
1220 	struct nfs4_ff_layout_mirror *mirror;
1221 	u32 status = *op_status;
1222 	int err;
1223 
1224 	if (status == 0) {
1225 		switch (error) {
1226 		case -ETIMEDOUT:
1227 		case -EPFNOSUPPORT:
1228 		case -EPROTONOSUPPORT:
1229 		case -EOPNOTSUPP:
1230 		case -ECONNREFUSED:
1231 		case -ECONNRESET:
1232 		case -EHOSTDOWN:
1233 		case -EHOSTUNREACH:
1234 		case -ENETUNREACH:
1235 		case -EADDRINUSE:
1236 		case -ENOBUFS:
1237 		case -EPIPE:
1238 		case -EPERM:
1239 			*op_status = status = NFS4ERR_NXIO;
1240 			break;
1241 		case -EACCES:
1242 			*op_status = status = NFS4ERR_ACCESS;
1243 			break;
1244 		default:
1245 			return;
1246 		}
1247 	}
1248 
1249 	mirror = FF_LAYOUT_COMP(lseg, idx);
1250 	err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1251 				       mirror, offset, length, status, opnum,
1252 				       nfs_io_gfp_mask());
1253 
1254 	switch (status) {
1255 	case NFS4ERR_DELAY:
1256 	case NFS4ERR_GRACE:
1257 		break;
1258 	case NFS4ERR_NXIO:
1259 		ff_layout_mark_ds_unreachable(lseg, idx);
1260 		/*
1261 		 * Don't return the layout if this is a read and we still
1262 		 * have layouts to try
1263 		 */
1264 		if (opnum == OP_READ)
1265 			break;
1266 		fallthrough;
1267 	default:
1268 		pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
1269 						  lseg);
1270 	}
1271 
1272 	dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1273 }
1274 
1275 /* NFS_PROTO call done callback routines */
1276 static int ff_layout_read_done_cb(struct rpc_task *task,
1277 				struct nfs_pgio_header *hdr)
1278 {
1279 	int err;
1280 
1281 	if (task->tk_status < 0) {
1282 		ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1283 					    hdr->args.offset, hdr->args.count,
1284 					    &hdr->res.op_status, OP_READ,
1285 					    task->tk_status);
1286 		trace_ff_layout_read_error(hdr);
1287 	}
1288 
1289 	err = ff_layout_async_handle_error(task, hdr->args.context->state,
1290 					   hdr->ds_clp, hdr->lseg,
1291 					   hdr->pgio_mirror_idx);
1292 
1293 	trace_nfs4_pnfs_read(hdr, err);
1294 	clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1295 	clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1296 	switch (err) {
1297 	case -NFS4ERR_RESET_TO_PNFS:
1298 		set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1299 		return task->tk_status;
1300 	case -NFS4ERR_RESET_TO_MDS:
1301 		set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1302 		return task->tk_status;
1303 	case -EAGAIN:
1304 		goto out_eagain;
1305 	}
1306 
1307 	return 0;
1308 out_eagain:
1309 	rpc_restart_call_prepare(task);
1310 	return -EAGAIN;
1311 }
1312 
1313 static bool
1314 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1315 {
1316 	return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1317 }
1318 
1319 /*
1320  * We reference the rpc_cred of the first WRITE that triggers the need for
1321  * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1322  * rfc5661 is not clear about which credential should be used.
1323  *
1324  * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1325  * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1326  * we always send layoutcommit after DS writes.
1327  */
1328 static void
1329 ff_layout_set_layoutcommit(struct inode *inode,
1330 		struct pnfs_layout_segment *lseg,
1331 		loff_t end_offset)
1332 {
1333 	if (!ff_layout_need_layoutcommit(lseg))
1334 		return;
1335 
1336 	pnfs_set_layoutcommit(inode, lseg, end_offset);
1337 	dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1338 		(unsigned long long) NFS_I(inode)->layout->plh_lwb);
1339 }
1340 
1341 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1342 		struct nfs_pgio_header *hdr)
1343 {
1344 	if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1345 		return;
1346 	nfs4_ff_layout_stat_io_start_read(hdr->inode,
1347 			FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1348 			hdr->args.count,
1349 			task->tk_start);
1350 }
1351 
1352 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1353 		struct nfs_pgio_header *hdr)
1354 {
1355 	if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1356 		return;
1357 	nfs4_ff_layout_stat_io_end_read(task,
1358 			FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1359 			hdr->args.count,
1360 			hdr->res.count);
1361 	set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1362 }
1363 
1364 static int ff_layout_read_prepare_common(struct rpc_task *task,
1365 					 struct nfs_pgio_header *hdr)
1366 {
1367 	if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1368 		rpc_exit(task, -EIO);
1369 		return -EIO;
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 	ff_layout_read_prepare_common(task, hdr);
1402 }
1403 
1404 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1405 {
1406 	struct nfs_pgio_header *hdr = data;
1407 
1408 	if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1409 	    task->tk_status == 0) {
1410 		nfs4_sequence_done(task, &hdr->res.seq_res);
1411 		return;
1412 	}
1413 
1414 	/* Note this may cause RPC to be resent */
1415 	hdr->mds_ops->rpc_call_done(task, hdr);
1416 }
1417 
1418 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1419 {
1420 	struct nfs_pgio_header *hdr = data;
1421 
1422 	ff_layout_read_record_layoutstats_done(task, hdr);
1423 	rpc_count_iostats_metrics(task,
1424 	    &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1425 }
1426 
1427 static void ff_layout_read_release(void *data)
1428 {
1429 	struct nfs_pgio_header *hdr = data;
1430 
1431 	ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1432 	if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1433 		ff_layout_resend_pnfs_read(hdr);
1434 	else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1435 		ff_layout_reset_read(hdr);
1436 	pnfs_generic_rw_release(data);
1437 }
1438 
1439 
1440 static int ff_layout_write_done_cb(struct rpc_task *task,
1441 				struct nfs_pgio_header *hdr)
1442 {
1443 	loff_t end_offs = 0;
1444 	int err;
1445 
1446 	if (task->tk_status < 0) {
1447 		ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1448 					    hdr->args.offset, hdr->args.count,
1449 					    &hdr->res.op_status, OP_WRITE,
1450 					    task->tk_status);
1451 		trace_ff_layout_write_error(hdr);
1452 	}
1453 
1454 	err = ff_layout_async_handle_error(task, hdr->args.context->state,
1455 					   hdr->ds_clp, hdr->lseg,
1456 					   hdr->pgio_mirror_idx);
1457 
1458 	trace_nfs4_pnfs_write(hdr, err);
1459 	clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1460 	clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1461 	switch (err) {
1462 	case -NFS4ERR_RESET_TO_PNFS:
1463 		set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1464 		return task->tk_status;
1465 	case -NFS4ERR_RESET_TO_MDS:
1466 		set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1467 		return task->tk_status;
1468 	case -EAGAIN:
1469 		return -EAGAIN;
1470 	}
1471 
1472 	if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1473 	    hdr->res.verf->committed == NFS_DATA_SYNC)
1474 		end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1475 
1476 	/* Note: if the write is unstable, don't set end_offs until commit */
1477 	ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1478 
1479 	/* zero out fattr since we don't care DS attr at all */
1480 	hdr->fattr.valid = 0;
1481 	if (task->tk_status >= 0)
1482 		nfs_writeback_update_inode(hdr);
1483 
1484 	return 0;
1485 }
1486 
1487 static int ff_layout_commit_done_cb(struct rpc_task *task,
1488 				     struct nfs_commit_data *data)
1489 {
1490 	int err;
1491 
1492 	if (task->tk_status < 0) {
1493 		ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1494 					    data->args.offset, data->args.count,
1495 					    &data->res.op_status, OP_COMMIT,
1496 					    task->tk_status);
1497 		trace_ff_layout_commit_error(data);
1498 	}
1499 
1500 	err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1501 					   data->lseg, data->ds_commit_index);
1502 
1503 	trace_nfs4_pnfs_commit_ds(data, err);
1504 	switch (err) {
1505 	case -NFS4ERR_RESET_TO_PNFS:
1506 		pnfs_generic_prepare_to_resend_writes(data);
1507 		return -EAGAIN;
1508 	case -NFS4ERR_RESET_TO_MDS:
1509 		pnfs_generic_prepare_to_resend_writes(data);
1510 		return -EAGAIN;
1511 	case -EAGAIN:
1512 		rpc_restart_call_prepare(task);
1513 		return -EAGAIN;
1514 	}
1515 
1516 	ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1517 
1518 	return 0;
1519 }
1520 
1521 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1522 		struct nfs_pgio_header *hdr)
1523 {
1524 	if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1525 		return;
1526 	nfs4_ff_layout_stat_io_start_write(hdr->inode,
1527 			FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1528 			hdr->args.count,
1529 			task->tk_start);
1530 }
1531 
1532 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1533 		struct nfs_pgio_header *hdr)
1534 {
1535 	if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1536 		return;
1537 	nfs4_ff_layout_stat_io_end_write(task,
1538 			FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1539 			hdr->args.count, hdr->res.count,
1540 			hdr->res.verf->committed);
1541 	set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1542 }
1543 
1544 static int ff_layout_write_prepare_common(struct rpc_task *task,
1545 					  struct nfs_pgio_header *hdr)
1546 {
1547 	if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1548 		rpc_exit(task, -EIO);
1549 		return -EIO;
1550 	}
1551 
1552 	ff_layout_write_record_layoutstats_start(task, hdr);
1553 	return 0;
1554 }
1555 
1556 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1557 {
1558 	struct nfs_pgio_header *hdr = data;
1559 
1560 	if (ff_layout_write_prepare_common(task, hdr))
1561 		return;
1562 
1563 	rpc_call_start(task);
1564 }
1565 
1566 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1567 {
1568 	struct nfs_pgio_header *hdr = data;
1569 
1570 	if (nfs4_setup_sequence(hdr->ds_clp,
1571 				&hdr->args.seq_args,
1572 				&hdr->res.seq_res,
1573 				task))
1574 		return;
1575 
1576 	ff_layout_write_prepare_common(task, hdr);
1577 }
1578 
1579 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1580 {
1581 	struct nfs_pgio_header *hdr = data;
1582 
1583 	if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1584 	    task->tk_status == 0) {
1585 		nfs4_sequence_done(task, &hdr->res.seq_res);
1586 		return;
1587 	}
1588 
1589 	/* Note this may cause RPC to be resent */
1590 	hdr->mds_ops->rpc_call_done(task, hdr);
1591 }
1592 
1593 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1594 {
1595 	struct nfs_pgio_header *hdr = data;
1596 
1597 	ff_layout_write_record_layoutstats_done(task, hdr);
1598 	rpc_count_iostats_metrics(task,
1599 	    &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1600 }
1601 
1602 static void ff_layout_write_release(void *data)
1603 {
1604 	struct nfs_pgio_header *hdr = data;
1605 
1606 	ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1607 	if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1608 		ff_layout_send_layouterror(hdr->lseg);
1609 		ff_layout_reset_write(hdr, true);
1610 	} else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1611 		ff_layout_reset_write(hdr, false);
1612 	pnfs_generic_rw_release(data);
1613 }
1614 
1615 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1616 		struct nfs_commit_data *cdata)
1617 {
1618 	if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1619 		return;
1620 	nfs4_ff_layout_stat_io_start_write(cdata->inode,
1621 			FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1622 			0, task->tk_start);
1623 }
1624 
1625 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1626 		struct nfs_commit_data *cdata)
1627 {
1628 	struct nfs_page *req;
1629 	__u64 count = 0;
1630 
1631 	if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1632 		return;
1633 
1634 	if (task->tk_status == 0) {
1635 		list_for_each_entry(req, &cdata->pages, wb_list)
1636 			count += req->wb_bytes;
1637 	}
1638 	nfs4_ff_layout_stat_io_end_write(task,
1639 			FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1640 			count, count, NFS_FILE_SYNC);
1641 	set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
1642 }
1643 
1644 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1645 		struct nfs_commit_data *cdata)
1646 {
1647 	ff_layout_commit_record_layoutstats_start(task, cdata);
1648 }
1649 
1650 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1651 {
1652 	ff_layout_commit_prepare_common(task, data);
1653 	rpc_call_start(task);
1654 }
1655 
1656 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1657 {
1658 	struct nfs_commit_data *wdata = data;
1659 
1660 	if (nfs4_setup_sequence(wdata->ds_clp,
1661 				&wdata->args.seq_args,
1662 				&wdata->res.seq_res,
1663 				task))
1664 		return;
1665 	ff_layout_commit_prepare_common(task, data);
1666 }
1667 
1668 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1669 {
1670 	pnfs_generic_write_commit_done(task, data);
1671 }
1672 
1673 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1674 {
1675 	struct nfs_commit_data *cdata = data;
1676 
1677 	ff_layout_commit_record_layoutstats_done(task, cdata);
1678 	rpc_count_iostats_metrics(task,
1679 	    &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1680 }
1681 
1682 static void ff_layout_commit_release(void *data)
1683 {
1684 	struct nfs_commit_data *cdata = data;
1685 
1686 	ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1687 	pnfs_generic_commit_release(data);
1688 }
1689 
1690 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1691 	.rpc_call_prepare = ff_layout_read_prepare_v3,
1692 	.rpc_call_done = ff_layout_read_call_done,
1693 	.rpc_count_stats = ff_layout_read_count_stats,
1694 	.rpc_release = ff_layout_read_release,
1695 };
1696 
1697 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1698 	.rpc_call_prepare = ff_layout_read_prepare_v4,
1699 	.rpc_call_done = ff_layout_read_call_done,
1700 	.rpc_count_stats = ff_layout_read_count_stats,
1701 	.rpc_release = ff_layout_read_release,
1702 };
1703 
1704 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1705 	.rpc_call_prepare = ff_layout_write_prepare_v3,
1706 	.rpc_call_done = ff_layout_write_call_done,
1707 	.rpc_count_stats = ff_layout_write_count_stats,
1708 	.rpc_release = ff_layout_write_release,
1709 };
1710 
1711 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1712 	.rpc_call_prepare = ff_layout_write_prepare_v4,
1713 	.rpc_call_done = ff_layout_write_call_done,
1714 	.rpc_count_stats = ff_layout_write_count_stats,
1715 	.rpc_release = ff_layout_write_release,
1716 };
1717 
1718 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1719 	.rpc_call_prepare = ff_layout_commit_prepare_v3,
1720 	.rpc_call_done = ff_layout_commit_done,
1721 	.rpc_count_stats = ff_layout_commit_count_stats,
1722 	.rpc_release = ff_layout_commit_release,
1723 };
1724 
1725 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1726 	.rpc_call_prepare = ff_layout_commit_prepare_v4,
1727 	.rpc_call_done = ff_layout_commit_done,
1728 	.rpc_count_stats = ff_layout_commit_count_stats,
1729 	.rpc_release = ff_layout_commit_release,
1730 };
1731 
1732 static enum pnfs_try_status
1733 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1734 {
1735 	struct pnfs_layout_segment *lseg = hdr->lseg;
1736 	struct nfs4_pnfs_ds *ds;
1737 	struct rpc_clnt *ds_clnt;
1738 	struct nfs4_ff_layout_mirror *mirror;
1739 	const struct cred *ds_cred;
1740 	loff_t offset = hdr->args.offset;
1741 	u32 idx = hdr->pgio_mirror_idx;
1742 	int vers;
1743 	struct nfs_fh *fh;
1744 
1745 	dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1746 		__func__, hdr->inode->i_ino,
1747 		hdr->args.pgbase, (size_t)hdr->args.count, offset);
1748 
1749 	mirror = FF_LAYOUT_COMP(lseg, idx);
1750 	ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
1751 	if (!ds)
1752 		goto out_failed;
1753 
1754 	ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1755 						   hdr->inode);
1756 	if (IS_ERR(ds_clnt))
1757 		goto out_failed;
1758 
1759 	ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1760 	if (!ds_cred)
1761 		goto out_failed;
1762 
1763 	vers = nfs4_ff_layout_ds_version(mirror);
1764 
1765 	dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1766 		ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
1767 
1768 	hdr->pgio_done_cb = ff_layout_read_done_cb;
1769 	refcount_inc(&ds->ds_clp->cl_count);
1770 	hdr->ds_clp = ds->ds_clp;
1771 	fh = nfs4_ff_layout_select_ds_fh(mirror);
1772 	if (fh)
1773 		hdr->args.fh = fh;
1774 
1775 	nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1776 
1777 	/*
1778 	 * Note that if we ever decide to split across DSes,
1779 	 * then we may need to handle dense-like offsets.
1780 	 */
1781 	hdr->args.offset = offset;
1782 	hdr->mds_offset = offset;
1783 
1784 	/* Perform an asynchronous read to ds */
1785 	nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1786 			  vers == 3 ? &ff_layout_read_call_ops_v3 :
1787 				      &ff_layout_read_call_ops_v4,
1788 			  0, RPC_TASK_SOFTCONN);
1789 	put_cred(ds_cred);
1790 	return PNFS_ATTEMPTED;
1791 
1792 out_failed:
1793 	if (ff_layout_avoid_mds_available_ds(lseg))
1794 		return PNFS_TRY_AGAIN;
1795 	trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
1796 			hdr->args.offset, hdr->args.count,
1797 			IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
1798 	return PNFS_NOT_ATTEMPTED;
1799 }
1800 
1801 /* Perform async writes. */
1802 static enum pnfs_try_status
1803 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1804 {
1805 	struct pnfs_layout_segment *lseg = hdr->lseg;
1806 	struct nfs4_pnfs_ds *ds;
1807 	struct rpc_clnt *ds_clnt;
1808 	struct nfs4_ff_layout_mirror *mirror;
1809 	const struct cred *ds_cred;
1810 	loff_t offset = hdr->args.offset;
1811 	int vers;
1812 	struct nfs_fh *fh;
1813 	u32 idx = hdr->pgio_mirror_idx;
1814 
1815 	mirror = FF_LAYOUT_COMP(lseg, idx);
1816 	ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1817 	if (!ds)
1818 		goto out_failed;
1819 
1820 	ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1821 						   hdr->inode);
1822 	if (IS_ERR(ds_clnt))
1823 		goto out_failed;
1824 
1825 	ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1826 	if (!ds_cred)
1827 		goto out_failed;
1828 
1829 	vers = nfs4_ff_layout_ds_version(mirror);
1830 
1831 	dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1832 		__func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1833 		offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
1834 		vers);
1835 
1836 	hdr->pgio_done_cb = ff_layout_write_done_cb;
1837 	refcount_inc(&ds->ds_clp->cl_count);
1838 	hdr->ds_clp = ds->ds_clp;
1839 	hdr->ds_commit_idx = idx;
1840 	fh = nfs4_ff_layout_select_ds_fh(mirror);
1841 	if (fh)
1842 		hdr->args.fh = fh;
1843 
1844 	nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1845 
1846 	/*
1847 	 * Note that if we ever decide to split across DSes,
1848 	 * then we may need to handle dense-like offsets.
1849 	 */
1850 	hdr->args.offset = offset;
1851 
1852 	/* Perform an asynchronous write */
1853 	nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1854 			  vers == 3 ? &ff_layout_write_call_ops_v3 :
1855 				      &ff_layout_write_call_ops_v4,
1856 			  sync, RPC_TASK_SOFTCONN);
1857 	put_cred(ds_cred);
1858 	return PNFS_ATTEMPTED;
1859 
1860 out_failed:
1861 	if (ff_layout_avoid_mds_available_ds(lseg))
1862 		return PNFS_TRY_AGAIN;
1863 	trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
1864 			hdr->args.offset, hdr->args.count,
1865 			IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
1866 	return PNFS_NOT_ATTEMPTED;
1867 }
1868 
1869 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1870 {
1871 	return i;
1872 }
1873 
1874 static struct nfs_fh *
1875 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1876 {
1877 	struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1878 
1879 	/* FIXME: Assume that there is only one NFS version available
1880 	 * for the DS.
1881 	 */
1882 	return &flseg->mirror_array[i]->fh_versions[0];
1883 }
1884 
1885 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1886 {
1887 	struct pnfs_layout_segment *lseg = data->lseg;
1888 	struct nfs4_pnfs_ds *ds;
1889 	struct rpc_clnt *ds_clnt;
1890 	struct nfs4_ff_layout_mirror *mirror;
1891 	const struct cred *ds_cred;
1892 	u32 idx;
1893 	int vers, ret;
1894 	struct nfs_fh *fh;
1895 
1896 	if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1897 	    test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1898 		goto out_err;
1899 
1900 	idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1901 	mirror = FF_LAYOUT_COMP(lseg, idx);
1902 	ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1903 	if (!ds)
1904 		goto out_err;
1905 
1906 	ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1907 						   data->inode);
1908 	if (IS_ERR(ds_clnt))
1909 		goto out_err;
1910 
1911 	ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
1912 	if (!ds_cred)
1913 		goto out_err;
1914 
1915 	vers = nfs4_ff_layout_ds_version(mirror);
1916 
1917 	dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1918 		data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
1919 		vers);
1920 	data->commit_done_cb = ff_layout_commit_done_cb;
1921 	data->cred = ds_cred;
1922 	refcount_inc(&ds->ds_clp->cl_count);
1923 	data->ds_clp = ds->ds_clp;
1924 	fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1925 	if (fh)
1926 		data->args.fh = fh;
1927 
1928 	ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1929 				   vers == 3 ? &ff_layout_commit_call_ops_v3 :
1930 					       &ff_layout_commit_call_ops_v4,
1931 				   how, RPC_TASK_SOFTCONN);
1932 	put_cred(ds_cred);
1933 	return ret;
1934 out_err:
1935 	pnfs_generic_prepare_to_resend_writes(data);
1936 	pnfs_generic_commit_release(data);
1937 	return -EAGAIN;
1938 }
1939 
1940 static int
1941 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1942 			   int how, struct nfs_commit_info *cinfo)
1943 {
1944 	return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1945 					    ff_layout_initiate_commit);
1946 }
1947 
1948 static struct pnfs_ds_commit_info *
1949 ff_layout_get_ds_info(struct inode *inode)
1950 {
1951 	struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1952 
1953 	if (layout == NULL)
1954 		return NULL;
1955 
1956 	return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1957 }
1958 
1959 static void
1960 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
1961 		struct pnfs_layout_segment *lseg)
1962 {
1963 	struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1964 	struct inode *inode = lseg->pls_layout->plh_inode;
1965 	struct pnfs_commit_array *array, *new;
1966 
1967 	new = pnfs_alloc_commit_array(flseg->mirror_array_cnt,
1968 				      nfs_io_gfp_mask());
1969 	if (new) {
1970 		spin_lock(&inode->i_lock);
1971 		array = pnfs_add_commit_array(fl_cinfo, new, lseg);
1972 		spin_unlock(&inode->i_lock);
1973 		if (array != new)
1974 			pnfs_free_commit_array(new);
1975 	}
1976 }
1977 
1978 static void
1979 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
1980 		struct inode *inode)
1981 {
1982 	spin_lock(&inode->i_lock);
1983 	pnfs_generic_ds_cinfo_destroy(fl_cinfo);
1984 	spin_unlock(&inode->i_lock);
1985 }
1986 
1987 static void
1988 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1989 {
1990 	nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1991 						  id_node));
1992 }
1993 
1994 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
1995 				  const struct nfs4_layoutreturn_args *args,
1996 				  const struct nfs4_flexfile_layoutreturn_args *ff_args)
1997 {
1998 	__be32 *start;
1999 
2000 	start = xdr_reserve_space(xdr, 4);
2001 	if (unlikely(!start))
2002 		return -E2BIG;
2003 
2004 	*start = cpu_to_be32(ff_args->num_errors);
2005 	/* This assume we always return _ALL_ layouts */
2006 	return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
2007 }
2008 
2009 static void
2010 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
2011 {
2012 	WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
2013 }
2014 
2015 static void
2016 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2017 			    const nfs4_stateid *stateid,
2018 			    const struct nfs42_layoutstat_devinfo *devinfo)
2019 {
2020 	__be32 *p;
2021 
2022 	p = xdr_reserve_space(xdr, 8 + 8);
2023 	p = xdr_encode_hyper(p, devinfo->offset);
2024 	p = xdr_encode_hyper(p, devinfo->length);
2025 	encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2026 	p = xdr_reserve_space(xdr, 4*8);
2027 	p = xdr_encode_hyper(p, devinfo->read_count);
2028 	p = xdr_encode_hyper(p, devinfo->read_bytes);
2029 	p = xdr_encode_hyper(p, devinfo->write_count);
2030 	p = xdr_encode_hyper(p, devinfo->write_bytes);
2031 	encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2032 }
2033 
2034 static void
2035 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2036 			    const nfs4_stateid *stateid,
2037 			    const struct nfs42_layoutstat_devinfo *devinfo)
2038 {
2039 	ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2040 	ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2041 			devinfo->ld_private.data);
2042 }
2043 
2044 /* report nothing for now */
2045 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2046 		const struct nfs4_layoutreturn_args *args,
2047 		struct nfs4_flexfile_layoutreturn_args *ff_args)
2048 {
2049 	__be32 *p;
2050 	int i;
2051 
2052 	p = xdr_reserve_space(xdr, 4);
2053 	*p = cpu_to_be32(ff_args->num_dev);
2054 	for (i = 0; i < ff_args->num_dev; i++)
2055 		ff_layout_encode_ff_iostat(xdr,
2056 				&args->layout->plh_stateid,
2057 				&ff_args->devinfo[i]);
2058 }
2059 
2060 static void
2061 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2062 		unsigned int num_entries)
2063 {
2064 	unsigned int i;
2065 
2066 	for (i = 0; i < num_entries; i++) {
2067 		if (!devinfo[i].ld_private.ops)
2068 			continue;
2069 		if (!devinfo[i].ld_private.ops->free)
2070 			continue;
2071 		devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2072 	}
2073 }
2074 
2075 static struct nfs4_deviceid_node *
2076 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2077 			      struct pnfs_device *pdev, gfp_t gfp_flags)
2078 {
2079 	struct nfs4_ff_layout_ds *dsaddr;
2080 
2081 	dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2082 	if (!dsaddr)
2083 		return NULL;
2084 	return &dsaddr->id_node;
2085 }
2086 
2087 static void
2088 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2089 		const void *voidargs,
2090 		const struct nfs4_xdr_opaque_data *ff_opaque)
2091 {
2092 	const struct nfs4_layoutreturn_args *args = voidargs;
2093 	struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2094 	struct xdr_buf tmp_buf = {
2095 		.head = {
2096 			[0] = {
2097 				.iov_base = page_address(ff_args->pages[0]),
2098 			},
2099 		},
2100 		.buflen = PAGE_SIZE,
2101 	};
2102 	struct xdr_stream tmp_xdr;
2103 	__be32 *start;
2104 
2105 	dprintk("%s: Begin\n", __func__);
2106 
2107 	xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
2108 
2109 	ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2110 	ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2111 
2112 	start = xdr_reserve_space(xdr, 4);
2113 	*start = cpu_to_be32(tmp_buf.len);
2114 	xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2115 
2116 	dprintk("%s: Return\n", __func__);
2117 }
2118 
2119 static void
2120 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2121 {
2122 	struct nfs4_flexfile_layoutreturn_args *ff_args;
2123 
2124 	if (!args->data)
2125 		return;
2126 	ff_args = args->data;
2127 	args->data = NULL;
2128 
2129 	ff_layout_free_ds_ioerr(&ff_args->errors);
2130 	ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2131 
2132 	put_page(ff_args->pages[0]);
2133 	kfree(ff_args);
2134 }
2135 
2136 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2137 	.encode = ff_layout_encode_layoutreturn,
2138 	.free = ff_layout_free_layoutreturn,
2139 };
2140 
2141 static int
2142 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2143 {
2144 	struct nfs4_flexfile_layoutreturn_args *ff_args;
2145 	struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2146 
2147 	ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask());
2148 	if (!ff_args)
2149 		goto out_nomem;
2150 	ff_args->pages[0] = alloc_page(nfs_io_gfp_mask());
2151 	if (!ff_args->pages[0])
2152 		goto out_nomem_free;
2153 
2154 	INIT_LIST_HEAD(&ff_args->errors);
2155 	ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2156 			&args->range, &ff_args->errors,
2157 			FF_LAYOUTRETURN_MAXERR);
2158 
2159 	spin_lock(&args->inode->i_lock);
2160 	ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2161 			&ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2162 	spin_unlock(&args->inode->i_lock);
2163 
2164 	args->ld_private->ops = &layoutreturn_ops;
2165 	args->ld_private->data = ff_args;
2166 	return 0;
2167 out_nomem_free:
2168 	kfree(ff_args);
2169 out_nomem:
2170 	return -ENOMEM;
2171 }
2172 
2173 #ifdef CONFIG_NFS_V4_2
2174 void
2175 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2176 {
2177 	struct pnfs_layout_hdr *lo = lseg->pls_layout;
2178 	struct nfs42_layout_error *errors;
2179 	LIST_HEAD(head);
2180 
2181 	if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2182 		return;
2183 	ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2184 	if (list_empty(&head))
2185 		return;
2186 
2187 	errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors),
2188 			       nfs_io_gfp_mask());
2189 	if (errors != NULL) {
2190 		const struct nfs4_ff_layout_ds_err *pos;
2191 		size_t n = 0;
2192 
2193 		list_for_each_entry(pos, &head, list) {
2194 			errors[n].offset = pos->offset;
2195 			errors[n].length = pos->length;
2196 			nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2197 			errors[n].errors[0].dev_id = pos->deviceid;
2198 			errors[n].errors[0].status = pos->status;
2199 			errors[n].errors[0].opnum = pos->opnum;
2200 			n++;
2201 			if (!list_is_last(&pos->list, &head) &&
2202 			    n < NFS42_LAYOUTERROR_MAX)
2203 				continue;
2204 			if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2205 				break;
2206 			n = 0;
2207 		}
2208 		kfree(errors);
2209 	}
2210 	ff_layout_free_ds_ioerr(&head);
2211 }
2212 #else
2213 void
2214 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2215 {
2216 }
2217 #endif
2218 
2219 static int
2220 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2221 {
2222 	const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2223 
2224 	return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2225 }
2226 
2227 static size_t
2228 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2229 			  const int buflen)
2230 {
2231 	const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2232 	const struct in6_addr *addr = &sin6->sin6_addr;
2233 
2234 	/*
2235 	 * RFC 4291, Section 2.2.2
2236 	 *
2237 	 * Shorthanded ANY address
2238 	 */
2239 	if (ipv6_addr_any(addr))
2240 		return snprintf(buf, buflen, "::");
2241 
2242 	/*
2243 	 * RFC 4291, Section 2.2.2
2244 	 *
2245 	 * Shorthanded loopback address
2246 	 */
2247 	if (ipv6_addr_loopback(addr))
2248 		return snprintf(buf, buflen, "::1");
2249 
2250 	/*
2251 	 * RFC 4291, Section 2.2.3
2252 	 *
2253 	 * Special presentation address format for mapped v4
2254 	 * addresses.
2255 	 */
2256 	if (ipv6_addr_v4mapped(addr))
2257 		return snprintf(buf, buflen, "::ffff:%pI4",
2258 					&addr->s6_addr32[3]);
2259 
2260 	/*
2261 	 * RFC 4291, Section 2.2.1
2262 	 */
2263 	return snprintf(buf, buflen, "%pI6c", addr);
2264 }
2265 
2266 /* Derived from rpc_sockaddr2uaddr */
2267 static void
2268 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2269 {
2270 	struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2271 	char portbuf[RPCBIND_MAXUADDRPLEN];
2272 	char addrbuf[RPCBIND_MAXUADDRLEN];
2273 	unsigned short port;
2274 	int len, netid_len;
2275 	__be32 *p;
2276 
2277 	switch (sap->sa_family) {
2278 	case AF_INET:
2279 		if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2280 			return;
2281 		port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2282 		break;
2283 	case AF_INET6:
2284 		if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2285 			return;
2286 		port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2287 		break;
2288 	default:
2289 		WARN_ON_ONCE(1);
2290 		return;
2291 	}
2292 
2293 	snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2294 	len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2295 
2296 	netid_len = strlen(da->da_netid);
2297 	p = xdr_reserve_space(xdr, 4 + netid_len);
2298 	xdr_encode_opaque(p, da->da_netid, netid_len);
2299 
2300 	p = xdr_reserve_space(xdr, 4 + len);
2301 	xdr_encode_opaque(p, addrbuf, len);
2302 }
2303 
2304 static void
2305 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2306 			 ktime_t t)
2307 {
2308 	struct timespec64 ts;
2309 	__be32 *p;
2310 
2311 	p = xdr_reserve_space(xdr, 12);
2312 	ts = ktime_to_timespec64(t);
2313 	p = xdr_encode_hyper(p, ts.tv_sec);
2314 	*p++ = cpu_to_be32(ts.tv_nsec);
2315 }
2316 
2317 static void
2318 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2319 			    struct nfs4_ff_io_stat *stat)
2320 {
2321 	__be32 *p;
2322 
2323 	p = xdr_reserve_space(xdr, 5 * 8);
2324 	p = xdr_encode_hyper(p, stat->ops_requested);
2325 	p = xdr_encode_hyper(p, stat->bytes_requested);
2326 	p = xdr_encode_hyper(p, stat->ops_completed);
2327 	p = xdr_encode_hyper(p, stat->bytes_completed);
2328 	p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2329 	ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2330 	ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2331 }
2332 
2333 static void
2334 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2335 			      const struct nfs42_layoutstat_devinfo *devinfo,
2336 			      struct nfs4_ff_layout_mirror *mirror)
2337 {
2338 	struct nfs4_pnfs_ds_addr *da;
2339 	struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2340 	struct nfs_fh *fh = &mirror->fh_versions[0];
2341 	__be32 *p;
2342 
2343 	da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2344 	dprintk("%s: DS %s: encoding address %s\n",
2345 		__func__, ds->ds_remotestr, da->da_remotestr);
2346 	/* netaddr4 */
2347 	ff_layout_encode_netaddr(xdr, da);
2348 	/* nfs_fh4 */
2349 	p = xdr_reserve_space(xdr, 4 + fh->size);
2350 	xdr_encode_opaque(p, fh->data, fh->size);
2351 	/* ff_io_latency4 read */
2352 	spin_lock(&mirror->lock);
2353 	ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2354 	/* ff_io_latency4 write */
2355 	ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2356 	spin_unlock(&mirror->lock);
2357 	/* nfstime4 */
2358 	ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2359 	/* bool */
2360 	p = xdr_reserve_space(xdr, 4);
2361 	*p = cpu_to_be32(false);
2362 }
2363 
2364 static void
2365 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2366 			     const struct nfs4_xdr_opaque_data *opaque)
2367 {
2368 	struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2369 			struct nfs42_layoutstat_devinfo, ld_private);
2370 	__be32 *start;
2371 
2372 	/* layoutupdate length */
2373 	start = xdr_reserve_space(xdr, 4);
2374 	ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2375 
2376 	*start = cpu_to_be32((xdr->p - start - 1) * 4);
2377 }
2378 
2379 static void
2380 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2381 {
2382 	struct nfs4_ff_layout_mirror *mirror = opaque->data;
2383 
2384 	ff_layout_put_mirror(mirror);
2385 }
2386 
2387 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2388 	.encode = ff_layout_encode_layoutstats,
2389 	.free	= ff_layout_free_layoutstats,
2390 };
2391 
2392 static int
2393 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2394 			       struct nfs42_layoutstat_devinfo *devinfo,
2395 			       int dev_limit)
2396 {
2397 	struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2398 	struct nfs4_ff_layout_mirror *mirror;
2399 	struct nfs4_deviceid_node *dev;
2400 	int i = 0;
2401 
2402 	list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2403 		if (i >= dev_limit)
2404 			break;
2405 		if (IS_ERR_OR_NULL(mirror->mirror_ds))
2406 			continue;
2407 		if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2408 			continue;
2409 		/* mirror refcount put in cleanup_layoutstats */
2410 		if (!refcount_inc_not_zero(&mirror->ref))
2411 			continue;
2412 		dev = &mirror->mirror_ds->id_node;
2413 		memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2414 		devinfo->offset = 0;
2415 		devinfo->length = NFS4_MAX_UINT64;
2416 		spin_lock(&mirror->lock);
2417 		devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2418 		devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2419 		devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2420 		devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2421 		spin_unlock(&mirror->lock);
2422 		devinfo->layout_type = LAYOUT_FLEX_FILES;
2423 		devinfo->ld_private.ops = &layoutstat_ops;
2424 		devinfo->ld_private.data = mirror;
2425 
2426 		devinfo++;
2427 		i++;
2428 	}
2429 	return i;
2430 }
2431 
2432 static int
2433 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2434 {
2435 	struct nfs4_flexfile_layout *ff_layout;
2436 	const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2437 
2438 	/* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2439 	args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo),
2440 				      nfs_io_gfp_mask());
2441 	if (!args->devinfo)
2442 		return -ENOMEM;
2443 
2444 	spin_lock(&args->inode->i_lock);
2445 	ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2446 	args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2447 			&args->devinfo[0], dev_count);
2448 	spin_unlock(&args->inode->i_lock);
2449 	if (!args->num_dev) {
2450 		kfree(args->devinfo);
2451 		args->devinfo = NULL;
2452 		return -ENOENT;
2453 	}
2454 
2455 	return 0;
2456 }
2457 
2458 static int
2459 ff_layout_set_layoutdriver(struct nfs_server *server,
2460 		const struct nfs_fh *dummy)
2461 {
2462 #if IS_ENABLED(CONFIG_NFS_V4_2)
2463 	server->caps |= NFS_CAP_LAYOUTSTATS;
2464 #endif
2465 	return 0;
2466 }
2467 
2468 static const struct pnfs_commit_ops ff_layout_commit_ops = {
2469 	.setup_ds_info		= ff_layout_setup_ds_info,
2470 	.release_ds_info	= ff_layout_release_ds_info,
2471 	.mark_request_commit	= pnfs_layout_mark_request_commit,
2472 	.clear_request_commit	= pnfs_generic_clear_request_commit,
2473 	.scan_commit_lists	= pnfs_generic_scan_commit_lists,
2474 	.recover_commit_reqs	= pnfs_generic_recover_commit_reqs,
2475 	.commit_pagelist	= ff_layout_commit_pagelist,
2476 };
2477 
2478 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2479 	.id			= LAYOUT_FLEX_FILES,
2480 	.name			= "LAYOUT_FLEX_FILES",
2481 	.owner			= THIS_MODULE,
2482 	.flags			= PNFS_LAYOUTGET_ON_OPEN,
2483 	.max_layoutget_response	= 4096, /* 1 page or so... */
2484 	.set_layoutdriver	= ff_layout_set_layoutdriver,
2485 	.alloc_layout_hdr	= ff_layout_alloc_layout_hdr,
2486 	.free_layout_hdr	= ff_layout_free_layout_hdr,
2487 	.alloc_lseg		= ff_layout_alloc_lseg,
2488 	.free_lseg		= ff_layout_free_lseg,
2489 	.add_lseg		= ff_layout_add_lseg,
2490 	.pg_read_ops		= &ff_layout_pg_read_ops,
2491 	.pg_write_ops		= &ff_layout_pg_write_ops,
2492 	.get_ds_info		= ff_layout_get_ds_info,
2493 	.free_deviceid_node	= ff_layout_free_deviceid_node,
2494 	.read_pagelist		= ff_layout_read_pagelist,
2495 	.write_pagelist		= ff_layout_write_pagelist,
2496 	.alloc_deviceid_node    = ff_layout_alloc_deviceid_node,
2497 	.prepare_layoutreturn   = ff_layout_prepare_layoutreturn,
2498 	.sync			= pnfs_nfs_generic_sync,
2499 	.prepare_layoutstats	= ff_layout_prepare_layoutstats,
2500 };
2501 
2502 static int __init nfs4flexfilelayout_init(void)
2503 {
2504 	printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2505 	       __func__);
2506 	return pnfs_register_layoutdriver(&flexfilelayout_type);
2507 }
2508 
2509 static void __exit nfs4flexfilelayout_exit(void)
2510 {
2511 	printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2512 	       __func__);
2513 	pnfs_unregister_layoutdriver(&flexfilelayout_type);
2514 }
2515 
2516 MODULE_ALIAS("nfs-layouttype4-4");
2517 
2518 MODULE_LICENSE("GPL");
2519 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2520 
2521 module_init(nfs4flexfilelayout_init);
2522 module_exit(nfs4flexfilelayout_exit);
2523 
2524 module_param(io_maxretrans, ushort, 0644);
2525 MODULE_PARM_DESC(io_maxretrans, "The  number of times the NFSv4.1 client "
2526 			"retries an I/O request before returning an error. ");
2527