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
  33enum nfs4_ff_op_type {
  34	NFS4_FF_OP_LAYOUTSTATS,
  35	NFS4_FF_OP_LAYOUTRETURN,
  36};
  37
  38static unsigned short io_maxretrans;
  39
  40static const struct pnfs_commit_ops ff_layout_commit_ops;
  41static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
  42		struct nfs_pgio_header *hdr);
  43static int
  44ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
  45			       struct nfs42_layoutstat_devinfo *devinfo,
  46			       int dev_limit, enum nfs4_ff_op_type type);
  47static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
  48			      const struct nfs42_layoutstat_devinfo *devinfo,
  49			      struct nfs4_ff_layout_mirror *mirror);
  50
  51static struct pnfs_layout_hdr *
  52ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
  53{
  54	struct nfs4_flexfile_layout *ffl;
  55
  56	ffl = kzalloc(sizeof(*ffl), gfp_flags);
  57	if (ffl) {
  58		pnfs_init_ds_commit_info(&ffl->commit_info);
  59		INIT_LIST_HEAD(&ffl->error_list);
  60		INIT_LIST_HEAD(&ffl->mirrors);
  61		ffl->last_report_time = ktime_get();
  62		ffl->commit_info.ops = &ff_layout_commit_ops;
  63		return &ffl->generic_hdr;
  64	} else
  65		return NULL;
  66}
  67
  68static void
  69ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
  70{
  71	struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo);
  72	struct nfs4_ff_layout_ds_err *err, *n;
  73
  74	list_for_each_entry_safe(err, n, &ffl->error_list, list) {
  75		list_del(&err->list);
  76		kfree(err);
  77	}
  78	kfree_rcu(ffl, generic_hdr.plh_rcu);
  79}
  80
  81static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
  82{
  83	__be32 *p;
  84
  85	p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
  86	if (unlikely(p == NULL))
  87		return -ENOBUFS;
  88	stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
  89	memcpy(stateid->data, p, NFS4_STATEID_SIZE);
  90	dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
  91		p[0], p[1], p[2], p[3]);
  92	return 0;
  93}
  94
  95static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
  96{
  97	__be32 *p;
  98
  99	p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
 100	if (unlikely(!p))
 101		return -ENOBUFS;
 102	memcpy(devid, p, NFS4_DEVICEID4_SIZE);
 103	nfs4_print_deviceid(devid);
 104	return 0;
 105}
 106
 107static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
 108{
 109	__be32 *p;
 110
 111	p = xdr_inline_decode(xdr, 4);
 112	if (unlikely(!p))
 113		return -ENOBUFS;
 114	fh->size = be32_to_cpup(p++);
 115	if (fh->size > NFS_MAXFHSIZE) {
 116		printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
 117		       fh->size);
 118		return -EOVERFLOW;
 119	}
 120	/* fh.data */
 121	p = xdr_inline_decode(xdr, fh->size);
 122	if (unlikely(!p))
 123		return -ENOBUFS;
 124	memcpy(&fh->data, p, fh->size);
 125	dprintk("%s: fh len %d\n", __func__, fh->size);
 126
 127	return 0;
 128}
 129
 130/*
 131 * Currently only stringified uids and gids are accepted.
 132 * I.e., kerberos is not supported to the DSes, so no pricipals.
 133 *
 134 * That means that one common function will suffice, but when
 135 * principals are added, this should be split to accomodate
 136 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
 137 */
 138static int
 139decode_name(struct xdr_stream *xdr, u32 *id)
 140{
 141	__be32 *p;
 142	int len;
 143
 144	/* opaque_length(4)*/
 145	p = xdr_inline_decode(xdr, 4);
 146	if (unlikely(!p))
 147		return -ENOBUFS;
 148	len = be32_to_cpup(p++);
 149	if (len < 0)
 150		return -EINVAL;
 151
 152	dprintk("%s: len %u\n", __func__, len);
 153
 154	/* opaque body */
 155	p = xdr_inline_decode(xdr, len);
 156	if (unlikely(!p))
 157		return -ENOBUFS;
 158
 159	if (!nfs_map_string_to_numeric((char *)p, len, id))
 160		return -EINVAL;
 161
 162	return 0;
 163}
 164
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 165static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
 166		const struct nfs4_ff_layout_mirror *m2)
 167{
 168	int i, j;
 169
 170	if (m1->fh_versions_cnt != m2->fh_versions_cnt)
 171		return false;
 172	for (i = 0; i < m1->fh_versions_cnt; i++) {
 173		bool found_fh = false;
 174		for (j = 0; j < m2->fh_versions_cnt; j++) {
 175			if (nfs_compare_fh(&m1->fh_versions[i],
 176					&m2->fh_versions[j]) == 0) {
 177				found_fh = true;
 178				break;
 179			}
 180		}
 181		if (!found_fh)
 182			return false;
 183	}
 184	return true;
 185}
 186
 187static struct nfs4_ff_layout_mirror *
 188ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
 189		struct nfs4_ff_layout_mirror *mirror)
 190{
 191	struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
 192	struct nfs4_ff_layout_mirror *pos;
 193	struct inode *inode = lo->plh_inode;
 194
 195	spin_lock(&inode->i_lock);
 196	list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
 197		if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
 198			continue;
 199		if (!ff_mirror_match_fh(mirror, pos))
 200			continue;
 201		if (refcount_inc_not_zero(&pos->ref)) {
 202			spin_unlock(&inode->i_lock);
 203			return pos;
 204		}
 205	}
 206	list_add(&mirror->mirrors, &ff_layout->mirrors);
 207	mirror->layout = lo;
 208	spin_unlock(&inode->i_lock);
 209	return mirror;
 210}
 211
 212static void
 213ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
 214{
 215	struct inode *inode;
 216	if (mirror->layout == NULL)
 217		return;
 218	inode = mirror->layout->plh_inode;
 219	spin_lock(&inode->i_lock);
 220	list_del(&mirror->mirrors);
 221	spin_unlock(&inode->i_lock);
 222	mirror->layout = NULL;
 223}
 224
 225static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
 226{
 227	struct nfs4_ff_layout_mirror *mirror;
 228
 229	mirror = kzalloc(sizeof(*mirror), gfp_flags);
 230	if (mirror != NULL) {
 231		spin_lock_init(&mirror->lock);
 232		refcount_set(&mirror->ref, 1);
 233		INIT_LIST_HEAD(&mirror->mirrors);
 234	}
 235	return mirror;
 236}
 237
 238static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
 239{
 240	const struct cred	*cred;
 241
 242	ff_layout_remove_mirror(mirror);
 243	kfree(mirror->fh_versions);
 244	cred = rcu_access_pointer(mirror->ro_cred);
 245	put_cred(cred);
 246	cred = rcu_access_pointer(mirror->rw_cred);
 247	put_cred(cred);
 248	nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
 249	kfree(mirror);
 250}
 251
 252static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
 253{
 254	if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
 255		ff_layout_free_mirror(mirror);
 256}
 257
 258static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
 259{
 260	u32 i;
 261
 262	for (i = 0; i < fls->mirror_array_cnt; i++)
 263		ff_layout_put_mirror(fls->mirror_array[i]);
 264}
 265
 266static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
 267{
 268	if (fls) {
 269		ff_layout_free_mirror_array(fls);
 270		kfree(fls);
 271	}
 272}
 273
 274static bool
 275ff_lseg_match_mirrors(struct pnfs_layout_segment *l1,
 276		struct pnfs_layout_segment *l2)
 277{
 278	const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1);
 279	const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1);
 280	u32 i;
 281
 282	if (fl1->mirror_array_cnt != fl2->mirror_array_cnt)
 283		return false;
 284	for (i = 0; i < fl1->mirror_array_cnt; i++) {
 285		if (fl1->mirror_array[i] != fl2->mirror_array[i])
 286			return false;
 287	}
 288	return true;
 289}
 290
 291static bool
 292ff_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
 308static bool
 309ff_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	if (!ff_lseg_match_mirrors(new, old))
 327		return false;
 328
 329	/* Mergeable: copy info from 'old' to 'new' */
 330	if (new_end < old_end)
 331		new_end = old_end;
 332	if (new->pls_range.offset < old->pls_range.offset)
 333		new->pls_range.offset = old->pls_range.offset;
 334	new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
 335			new_end);
 336	if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
 337		set_bit(NFS_LSEG_ROC, &new->pls_flags);
 338	return true;
 339}
 340
 341static void
 342ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
 343		struct pnfs_layout_segment *lseg,
 344		struct list_head *free_me)
 345{
 346	pnfs_generic_layout_insert_lseg(lo, lseg,
 347			ff_lseg_range_is_after,
 348			ff_lseg_merge,
 349			free_me);
 350}
 351
 352static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
 353{
 354	int i, j;
 355
 356	for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
 357		for (j = i + 1; j < fls->mirror_array_cnt; j++)
 358			if (fls->mirror_array[i]->efficiency <
 359			    fls->mirror_array[j]->efficiency)
 360				swap(fls->mirror_array[i],
 361				     fls->mirror_array[j]);
 362	}
 363}
 364
 365static struct pnfs_layout_segment *
 366ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
 367		     struct nfs4_layoutget_res *lgr,
 368		     gfp_t gfp_flags)
 369{
 370	struct pnfs_layout_segment *ret;
 371	struct nfs4_ff_layout_segment *fls = NULL;
 372	struct xdr_stream stream;
 373	struct xdr_buf buf;
 374	struct page *scratch;
 375	u64 stripe_unit;
 376	u32 mirror_array_cnt;
 377	__be32 *p;
 378	int i, rc;
 379
 380	dprintk("--> %s\n", __func__);
 381	scratch = alloc_page(gfp_flags);
 382	if (!scratch)
 383		return ERR_PTR(-ENOMEM);
 384
 385	xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
 386			      lgr->layoutp->len);
 387	xdr_set_scratch_page(&stream, scratch);
 388
 389	/* stripe unit and mirror_array_cnt */
 390	rc = -EIO;
 391	p = xdr_inline_decode(&stream, 8 + 4);
 392	if (!p)
 393		goto out_err_free;
 394
 395	p = xdr_decode_hyper(p, &stripe_unit);
 396	mirror_array_cnt = be32_to_cpup(p++);
 397	dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
 398		stripe_unit, mirror_array_cnt);
 399
 400	if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
 401	    mirror_array_cnt == 0)
 402		goto out_err_free;
 403
 404	rc = -ENOMEM;
 405	fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt),
 406			gfp_flags);
 407	if (!fls)
 408		goto out_err_free;
 409
 410	fls->mirror_array_cnt = mirror_array_cnt;
 411	fls->stripe_unit = stripe_unit;
 412
 413	for (i = 0; i < fls->mirror_array_cnt; i++) {
 414		struct nfs4_ff_layout_mirror *mirror;
 415		struct cred *kcred;
 416		const struct cred __rcu *cred;
 417		kuid_t uid;
 418		kgid_t gid;
 419		u32 ds_count, fh_count, id;
 420		int j;
 421
 422		rc = -EIO;
 423		p = xdr_inline_decode(&stream, 4);
 424		if (!p)
 425			goto out_err_free;
 426		ds_count = be32_to_cpup(p);
 427
 428		/* FIXME: allow for striping? */
 429		if (ds_count != 1)
 430			goto out_err_free;
 431
 432		fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
 433		if (fls->mirror_array[i] == NULL) {
 434			rc = -ENOMEM;
 435			goto out_err_free;
 436		}
 437
 438		fls->mirror_array[i]->ds_count = ds_count;
 439
 440		/* deviceid */
 441		rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
 442		if (rc)
 443			goto out_err_free;
 444
 445		/* efficiency */
 446		rc = -EIO;
 447		p = xdr_inline_decode(&stream, 4);
 448		if (!p)
 449			goto out_err_free;
 450		fls->mirror_array[i]->efficiency = be32_to_cpup(p);
 451
 452		/* stateid */
 453		rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
 454		if (rc)
 455			goto out_err_free;
 456
 457		/* fh */
 458		rc = -EIO;
 459		p = xdr_inline_decode(&stream, 4);
 460		if (!p)
 461			goto out_err_free;
 462		fh_count = be32_to_cpup(p);
 463
 464		fls->mirror_array[i]->fh_versions =
 465			kcalloc(fh_count, sizeof(struct nfs_fh),
 466				gfp_flags);
 467		if (fls->mirror_array[i]->fh_versions == NULL) {
 468			rc = -ENOMEM;
 469			goto out_err_free;
 470		}
 471
 472		for (j = 0; j < fh_count; j++) {
 473			rc = decode_nfs_fh(&stream,
 474					   &fls->mirror_array[i]->fh_versions[j]);
 475			if (rc)
 476				goto out_err_free;
 477		}
 478
 479		fls->mirror_array[i]->fh_versions_cnt = fh_count;
 480
 481		/* user */
 482		rc = decode_name(&stream, &id);
 483		if (rc)
 484			goto out_err_free;
 485
 486		uid = make_kuid(&init_user_ns, id);
 487
 488		/* group */
 489		rc = decode_name(&stream, &id);
 490		if (rc)
 491			goto out_err_free;
 492
 493		gid = make_kgid(&init_user_ns, id);
 494
 495		if (gfp_flags & __GFP_FS)
 496			kcred = prepare_kernel_cred(&init_task);
 497		else {
 498			unsigned int nofs_flags = memalloc_nofs_save();
 499			kcred = prepare_kernel_cred(&init_task);
 500			memalloc_nofs_restore(nofs_flags);
 501		}
 502		rc = -ENOMEM;
 503		if (!kcred)
 504			goto out_err_free;
 505		kcred->fsuid = uid;
 506		kcred->fsgid = gid;
 507		cred = RCU_INITIALIZER(kcred);
 508
 509		if (lgr->range.iomode == IOMODE_READ)
 510			rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
 511		else
 512			rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
 513
 514		mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
 515		if (mirror != fls->mirror_array[i]) {
 516			/* swap cred ptrs so free_mirror will clean up old */
 517			if (lgr->range.iomode == IOMODE_READ) {
 518				cred = xchg(&mirror->ro_cred, cred);
 519				rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
 520			} else {
 521				cred = xchg(&mirror->rw_cred, cred);
 522				rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
 523			}
 524			ff_layout_free_mirror(fls->mirror_array[i]);
 525			fls->mirror_array[i] = mirror;
 526		}
 527
 528		dprintk("%s: iomode %s uid %u gid %u\n", __func__,
 529			lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
 530			from_kuid(&init_user_ns, uid),
 531			from_kgid(&init_user_ns, gid));
 532	}
 533
 534	p = xdr_inline_decode(&stream, 4);
 535	if (!p)
 536		goto out_sort_mirrors;
 537	fls->flags = be32_to_cpup(p);
 538
 539	p = xdr_inline_decode(&stream, 4);
 540	if (!p)
 541		goto out_sort_mirrors;
 542	for (i=0; i < fls->mirror_array_cnt; i++)
 543		fls->mirror_array[i]->report_interval = be32_to_cpup(p);
 544
 545out_sort_mirrors:
 546	ff_layout_sort_mirrors(fls);
 547	ret = &fls->generic_hdr;
 548	dprintk("<-- %s (success)\n", __func__);
 549out_free_page:
 550	__free_page(scratch);
 551	return ret;
 552out_err_free:
 553	_ff_layout_free_lseg(fls);
 554	ret = ERR_PTR(rc);
 555	dprintk("<-- %s (%d)\n", __func__, rc);
 556	goto out_free_page;
 557}
 558
 559static void
 560ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
 561{
 562	struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
 563
 564	dprintk("--> %s\n", __func__);
 565
 566	if (lseg->pls_range.iomode == IOMODE_RW) {
 567		struct nfs4_flexfile_layout *ffl;
 568		struct inode *inode;
 569
 570		ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
 571		inode = ffl->generic_hdr.plh_inode;
 572		spin_lock(&inode->i_lock);
 573		pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg);
 574		spin_unlock(&inode->i_lock);
 575	}
 576	_ff_layout_free_lseg(fls);
 577}
 578
 579static void
 580nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
 581{
 582	/* first IO request? */
 583	if (atomic_inc_return(&timer->n_ops) == 1) {
 584		timer->start_time = now;
 585	}
 586}
 587
 588static ktime_t
 589nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
 590{
 591	ktime_t start;
 592
 593	if (atomic_dec_return(&timer->n_ops) < 0)
 594		WARN_ON_ONCE(1);
 595
 596	start = timer->start_time;
 597	timer->start_time = now;
 598	return ktime_sub(now, start);
 599}
 600
 601static bool
 602nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
 603			    struct nfs4_ff_layoutstat *layoutstat,
 604			    ktime_t now)
 605{
 606	s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
 607	struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
 608
 609	nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
 610	if (!mirror->start_time)
 611		mirror->start_time = now;
 612	if (mirror->report_interval != 0)
 613		report_interval = (s64)mirror->report_interval * 1000LL;
 614	else if (layoutstats_timer != 0)
 615		report_interval = (s64)layoutstats_timer * 1000LL;
 616	if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
 617			report_interval) {
 618		ffl->last_report_time = now;
 619		return true;
 620	}
 621
 622	return false;
 623}
 624
 625static void
 626nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
 627		__u64 requested)
 628{
 629	struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
 630
 631	iostat->ops_requested++;
 632	iostat->bytes_requested += requested;
 633}
 634
 635static void
 636nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
 637		__u64 requested,
 638		__u64 completed,
 639		ktime_t time_completed,
 640		ktime_t time_started)
 641{
 642	struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
 643	ktime_t completion_time = ktime_sub(time_completed, time_started);
 644	ktime_t timer;
 645
 646	iostat->ops_completed++;
 647	iostat->bytes_completed += completed;
 648	iostat->bytes_not_delivered += requested - completed;
 649
 650	timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
 651	iostat->total_busy_time =
 652			ktime_add(iostat->total_busy_time, timer);
 653	iostat->aggregate_completion_time =
 654			ktime_add(iostat->aggregate_completion_time,
 655					completion_time);
 656}
 657
 658static void
 659nfs4_ff_layout_stat_io_start_read(struct inode *inode,
 660		struct nfs4_ff_layout_mirror *mirror,
 661		__u64 requested, ktime_t now)
 662{
 663	bool report;
 664
 665	spin_lock(&mirror->lock);
 666	report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
 667	nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
 668	set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 669	spin_unlock(&mirror->lock);
 670
 671	if (report)
 672		pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
 673}
 674
 675static void
 676nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
 677		struct nfs4_ff_layout_mirror *mirror,
 678		__u64 requested,
 679		__u64 completed)
 680{
 681	spin_lock(&mirror->lock);
 682	nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
 683			requested, completed,
 684			ktime_get(), task->tk_start);
 685	set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 686	spin_unlock(&mirror->lock);
 687}
 688
 689static void
 690nfs4_ff_layout_stat_io_start_write(struct inode *inode,
 691		struct nfs4_ff_layout_mirror *mirror,
 692		__u64 requested, ktime_t now)
 693{
 694	bool report;
 695
 696	spin_lock(&mirror->lock);
 697	report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
 698	nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
 699	set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 700	spin_unlock(&mirror->lock);
 701
 702	if (report)
 703		pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
 704}
 705
 706static void
 707nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
 708		struct nfs4_ff_layout_mirror *mirror,
 709		__u64 requested,
 710		__u64 completed,
 711		enum nfs3_stable_how committed)
 712{
 713	if (committed == NFS_UNSTABLE)
 714		requested = completed = 0;
 715
 716	spin_lock(&mirror->lock);
 717	nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
 718			requested, completed, ktime_get(), task->tk_start);
 719	set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
 720	spin_unlock(&mirror->lock);
 721}
 722
 723static void
 724ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx)
 725{
 726	struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
 727
 728	if (devid)
 729		nfs4_mark_deviceid_unavailable(devid);
 730}
 731
 732static void
 733ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx)
 734{
 735	struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
 736
 737	if (devid)
 738		nfs4_mark_deviceid_available(devid);
 739}
 740
 741static struct nfs4_pnfs_ds *
 742ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
 743			     u32 start_idx, u32 *best_idx,
 744			     bool check_device)
 745{
 746	struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
 747	struct nfs4_ff_layout_mirror *mirror;
 748	struct nfs4_pnfs_ds *ds;
 749	u32 idx;
 750
 751	/* mirrors are initially sorted by efficiency */
 752	for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
 753		mirror = FF_LAYOUT_COMP(lseg, idx);
 754		ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
 755		if (!ds)
 756			continue;
 757
 758		if (check_device &&
 759		    nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
 760			continue;
 761
 762		*best_idx = idx;
 763		return ds;
 764	}
 765
 766	return NULL;
 767}
 768
 769static struct nfs4_pnfs_ds *
 770ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
 771				 u32 start_idx, u32 *best_idx)
 772{
 773	return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
 774}
 775
 776static struct nfs4_pnfs_ds *
 777ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
 778				   u32 start_idx, u32 *best_idx)
 779{
 780	return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
 781}
 782
 783static struct nfs4_pnfs_ds *
 784ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
 785				  u32 start_idx, u32 *best_idx)
 786{
 787	struct nfs4_pnfs_ds *ds;
 788
 789	ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
 790	if (ds)
 791		return ds;
 792	return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
 793}
 794
 795static struct nfs4_pnfs_ds *
 796ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
 797			  u32 *best_idx)
 798{
 799	struct pnfs_layout_segment *lseg = pgio->pg_lseg;
 800	struct nfs4_pnfs_ds *ds;
 801
 802	ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx,
 803					       best_idx);
 804	if (ds || !pgio->pg_mirror_idx)
 805		return ds;
 806	return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx);
 807}
 808
 809static void
 810ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
 811		      struct nfs_page *req,
 812		      bool strict_iomode)
 813{
 814	pnfs_put_lseg(pgio->pg_lseg);
 815	pgio->pg_lseg =
 816		pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
 817				   req_offset(req), req->wb_bytes, IOMODE_READ,
 818				   strict_iomode, nfs_io_gfp_mask());
 819	if (IS_ERR(pgio->pg_lseg)) {
 820		pgio->pg_error = PTR_ERR(pgio->pg_lseg);
 821		pgio->pg_lseg = NULL;
 822	}
 823}
 824
 825static void
 826ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio,
 827			  struct nfs_page *req)
 828{
 829	pnfs_generic_pg_check_layout(pgio);
 830	pnfs_generic_pg_check_range(pgio, req);
 831}
 832
 833static void
 834ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
 835			struct nfs_page *req)
 836{
 837	struct nfs_pgio_mirror *pgm;
 838	struct nfs4_ff_layout_mirror *mirror;
 839	struct nfs4_pnfs_ds *ds;
 840	u32 ds_idx;
 841
 
 
 
 842retry:
 843	ff_layout_pg_check_layout(pgio, req);
 844	/* Use full layout for now */
 845	if (!pgio->pg_lseg) {
 846		ff_layout_pg_get_read(pgio, req, false);
 847		if (!pgio->pg_lseg)
 848			goto out_nolseg;
 849	}
 850	if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
 851		ff_layout_pg_get_read(pgio, req, true);
 852		if (!pgio->pg_lseg)
 853			goto out_nolseg;
 854	}
 
 
 855
 856	ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
 857	if (!ds) {
 858		if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
 859			goto out_mds;
 860		pnfs_generic_pg_cleanup(pgio);
 861		/* Sleep for 1 second before retrying */
 862		ssleep(1);
 863		goto retry;
 864	}
 865
 866	mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
 867	pgm = &pgio->pg_mirrors[0];
 868	pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
 869
 870	pgio->pg_mirror_idx = ds_idx;
 871
 872	if (NFS_SERVER(pgio->pg_inode)->flags &
 873			(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
 874		pgio->pg_maxretrans = io_maxretrans;
 875	return;
 876out_nolseg:
 877	if (pgio->pg_error < 0)
 878		return;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 879out_mds:
 880	trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
 881			0, NFS4_MAX_UINT64, IOMODE_READ,
 882			NFS_I(pgio->pg_inode)->layout,
 883			pgio->pg_lseg);
 884	pgio->pg_maxretrans = 0;
 885	nfs_pageio_reset_read_mds(pgio);
 886}
 887
 888static void
 889ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
 890			struct nfs_page *req)
 891{
 892	struct nfs4_ff_layout_mirror *mirror;
 893	struct nfs_pgio_mirror *pgm;
 894	struct nfs4_pnfs_ds *ds;
 895	u32 i;
 896
 897retry:
 898	ff_layout_pg_check_layout(pgio, req);
 899	if (!pgio->pg_lseg) {
 900		pgio->pg_lseg =
 901			pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
 902					   req_offset(req), req->wb_bytes,
 903					   IOMODE_RW, false, nfs_io_gfp_mask());
 904		if (IS_ERR(pgio->pg_lseg)) {
 905			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
 906			pgio->pg_lseg = NULL;
 907			return;
 908		}
 909	}
 910	/* If no lseg, fall back to write through mds */
 911	if (pgio->pg_lseg == NULL)
 912		goto out_mds;
 913
 914	/* Use a direct mapping of ds_idx to pgio mirror_idx */
 915	if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
 916		goto out_eagain;
 917
 918	for (i = 0; i < pgio->pg_mirror_count; i++) {
 919		mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
 920		ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
 921		if (!ds) {
 922			if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
 923				goto out_mds;
 924			pnfs_generic_pg_cleanup(pgio);
 925			/* Sleep for 1 second before retrying */
 926			ssleep(1);
 927			goto retry;
 928		}
 929		pgm = &pgio->pg_mirrors[i];
 930		pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
 931	}
 932
 933	if (NFS_SERVER(pgio->pg_inode)->flags &
 934			(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
 935		pgio->pg_maxretrans = io_maxretrans;
 936	return;
 937out_eagain:
 938	pnfs_generic_pg_cleanup(pgio);
 939	pgio->pg_error = -EAGAIN;
 940	return;
 941out_mds:
 942	trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
 943			0, NFS4_MAX_UINT64, IOMODE_RW,
 944			NFS_I(pgio->pg_inode)->layout,
 945			pgio->pg_lseg);
 946	pgio->pg_maxretrans = 0;
 947	nfs_pageio_reset_write_mds(pgio);
 948	pgio->pg_error = -EAGAIN;
 949}
 950
 951static unsigned int
 952ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
 953				    struct nfs_page *req)
 954{
 955	if (!pgio->pg_lseg) {
 956		pgio->pg_lseg =
 957			pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
 958					   req_offset(req), req->wb_bytes,
 959					   IOMODE_RW, false, nfs_io_gfp_mask());
 960		if (IS_ERR(pgio->pg_lseg)) {
 961			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
 962			pgio->pg_lseg = NULL;
 963			goto out;
 964		}
 965	}
 966	if (pgio->pg_lseg)
 967		return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
 968
 969	trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
 970			0, NFS4_MAX_UINT64, IOMODE_RW,
 971			NFS_I(pgio->pg_inode)->layout,
 972			pgio->pg_lseg);
 973	/* no lseg means that pnfs is not in use, so no mirroring here */
 974	nfs_pageio_reset_write_mds(pgio);
 975out:
 976	return 1;
 977}
 978
 979static u32
 980ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
 981{
 982	u32 old = desc->pg_mirror_idx;
 983
 984	desc->pg_mirror_idx = idx;
 985	return old;
 986}
 987
 988static struct nfs_pgio_mirror *
 989ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
 990{
 991	return &desc->pg_mirrors[idx];
 992}
 993
 994static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
 995	.pg_init = ff_layout_pg_init_read,
 996	.pg_test = pnfs_generic_pg_test,
 997	.pg_doio = pnfs_generic_pg_readpages,
 998	.pg_cleanup = pnfs_generic_pg_cleanup,
 999};
1000
1001static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1002	.pg_init = ff_layout_pg_init_write,
1003	.pg_test = pnfs_generic_pg_test,
1004	.pg_doio = pnfs_generic_pg_writepages,
1005	.pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1006	.pg_cleanup = pnfs_generic_pg_cleanup,
1007	.pg_get_mirror = ff_layout_pg_get_mirror_write,
1008	.pg_set_mirror = ff_layout_pg_set_mirror_write,
1009};
1010
1011static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1012{
1013	struct rpc_task *task = &hdr->task;
1014
1015	pnfs_layoutcommit_inode(hdr->inode, false);
1016
1017	if (retry_pnfs) {
1018		dprintk("%s Reset task %5u for i/o through pNFS "
1019			"(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1020			hdr->task.tk_pid,
1021			hdr->inode->i_sb->s_id,
1022			(unsigned long long)NFS_FILEID(hdr->inode),
1023			hdr->args.count,
1024			(unsigned long long)hdr->args.offset);
1025
1026		hdr->completion_ops->reschedule_io(hdr);
1027		return;
1028	}
1029
1030	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1031		dprintk("%s Reset task %5u for i/o through MDS "
1032			"(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1033			hdr->task.tk_pid,
1034			hdr->inode->i_sb->s_id,
1035			(unsigned long long)NFS_FILEID(hdr->inode),
1036			hdr->args.count,
1037			(unsigned long long)hdr->args.offset);
1038
1039		trace_pnfs_mds_fallback_write_done(hdr->inode,
1040				hdr->args.offset, hdr->args.count,
1041				IOMODE_RW, NFS_I(hdr->inode)->layout,
1042				hdr->lseg);
1043		task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1044	}
1045}
1046
1047static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr)
1048{
1049	u32 idx = hdr->pgio_mirror_idx + 1;
1050	u32 new_idx = 0;
1051
1052	if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx))
1053		ff_layout_send_layouterror(hdr->lseg);
1054	else
1055		pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1056	pnfs_read_resend_pnfs(hdr, new_idx);
1057}
1058
1059static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1060{
1061	struct rpc_task *task = &hdr->task;
1062
1063	pnfs_layoutcommit_inode(hdr->inode, false);
1064	pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1065
1066	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1067		dprintk("%s Reset task %5u for i/o through MDS "
1068			"(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1069			hdr->task.tk_pid,
1070			hdr->inode->i_sb->s_id,
1071			(unsigned long long)NFS_FILEID(hdr->inode),
1072			hdr->args.count,
1073			(unsigned long long)hdr->args.offset);
1074
1075		trace_pnfs_mds_fallback_read_done(hdr->inode,
1076				hdr->args.offset, hdr->args.count,
1077				IOMODE_READ, NFS_I(hdr->inode)->layout,
1078				hdr->lseg);
1079		task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1080	}
1081}
1082
1083static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1084					   struct nfs4_state *state,
1085					   struct nfs_client *clp,
1086					   struct pnfs_layout_segment *lseg,
1087					   u32 idx)
1088{
1089	struct pnfs_layout_hdr *lo = lseg->pls_layout;
1090	struct inode *inode = lo->plh_inode;
1091	struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1092	struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1093
1094	switch (task->tk_status) {
1095	case -NFS4ERR_BADSESSION:
1096	case -NFS4ERR_BADSLOT:
1097	case -NFS4ERR_BAD_HIGH_SLOT:
1098	case -NFS4ERR_DEADSESSION:
1099	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1100	case -NFS4ERR_SEQ_FALSE_RETRY:
1101	case -NFS4ERR_SEQ_MISORDERED:
1102		dprintk("%s ERROR %d, Reset session. Exchangeid "
1103			"flags 0x%x\n", __func__, task->tk_status,
1104			clp->cl_exchange_flags);
1105		nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1106		break;
1107	case -NFS4ERR_DELAY:
1108	case -NFS4ERR_GRACE:
1109		rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1110		break;
1111	case -NFS4ERR_RETRY_UNCACHED_REP:
1112		break;
1113	/* Invalidate Layout errors */
1114	case -NFS4ERR_PNFS_NO_LAYOUT:
1115	case -ESTALE:           /* mapped NFS4ERR_STALE */
1116	case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
1117	case -EISDIR:           /* mapped NFS4ERR_ISDIR */
1118	case -NFS4ERR_FHEXPIRED:
1119	case -NFS4ERR_WRONG_TYPE:
1120		dprintk("%s Invalid layout error %d\n", __func__,
1121			task->tk_status);
1122		/*
1123		 * Destroy layout so new i/o will get a new layout.
1124		 * Layout will not be destroyed until all current lseg
1125		 * references are put. Mark layout as invalid to resend failed
1126		 * i/o and all i/o waiting on the slot table to the MDS until
1127		 * layout is destroyed and a new valid layout is obtained.
1128		 */
1129		pnfs_destroy_layout(NFS_I(inode));
1130		rpc_wake_up(&tbl->slot_tbl_waitq);
1131		goto reset;
1132	/* RPC connection errors */
1133	case -ECONNREFUSED:
1134	case -EHOSTDOWN:
1135	case -EHOSTUNREACH:
1136	case -ENETUNREACH:
1137	case -EIO:
1138	case -ETIMEDOUT:
1139	case -EPIPE:
1140	case -EPROTO:
1141	case -ENODEV:
1142		dprintk("%s DS connection error %d\n", __func__,
1143			task->tk_status);
1144		nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1145				&devid->deviceid);
1146		rpc_wake_up(&tbl->slot_tbl_waitq);
1147		fallthrough;
1148	default:
1149		if (ff_layout_avoid_mds_available_ds(lseg))
1150			return -NFS4ERR_RESET_TO_PNFS;
1151reset:
1152		dprintk("%s Retry through MDS. Error %d\n", __func__,
1153			task->tk_status);
1154		return -NFS4ERR_RESET_TO_MDS;
1155	}
1156	task->tk_status = 0;
1157	return -EAGAIN;
1158}
1159
1160/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1161static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1162					   struct pnfs_layout_segment *lseg,
1163					   u32 idx)
1164{
1165	struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1166
1167	switch (task->tk_status) {
1168	/* File access problems. Don't mark the device as unavailable */
1169	case -EACCES:
1170	case -ESTALE:
1171	case -EISDIR:
1172	case -EBADHANDLE:
1173	case -ELOOP:
1174	case -ENOSPC:
1175		break;
1176	case -EJUKEBOX:
1177		nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1178		goto out_retry;
1179	default:
1180		dprintk("%s DS connection error %d\n", __func__,
1181			task->tk_status);
1182		nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1183				&devid->deviceid);
1184	}
1185	/* FIXME: Need to prevent infinite looping here. */
1186	return -NFS4ERR_RESET_TO_PNFS;
1187out_retry:
1188	task->tk_status = 0;
1189	rpc_restart_call_prepare(task);
1190	rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1191	return -EAGAIN;
1192}
1193
1194static int ff_layout_async_handle_error(struct rpc_task *task,
1195					struct nfs4_state *state,
1196					struct nfs_client *clp,
1197					struct pnfs_layout_segment *lseg,
1198					u32 idx)
1199{
1200	int vers = clp->cl_nfs_mod->rpc_vers->number;
1201
1202	if (task->tk_status >= 0) {
1203		ff_layout_mark_ds_reachable(lseg, idx);
1204		return 0;
1205	}
1206
1207	/* Handle the case of an invalid layout segment */
1208	if (!pnfs_is_valid_lseg(lseg))
1209		return -NFS4ERR_RESET_TO_PNFS;
1210
1211	switch (vers) {
1212	case 3:
1213		return ff_layout_async_handle_error_v3(task, lseg, idx);
1214	case 4:
1215		return ff_layout_async_handle_error_v4(task, state, clp,
1216						       lseg, idx);
1217	default:
1218		/* should never happen */
1219		WARN_ON_ONCE(1);
1220		return 0;
1221	}
1222}
1223
1224static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1225					u32 idx, u64 offset, u64 length,
1226					u32 *op_status, int opnum, int error)
1227{
1228	struct nfs4_ff_layout_mirror *mirror;
1229	u32 status = *op_status;
1230	int err;
1231
1232	if (status == 0) {
1233		switch (error) {
1234		case -ETIMEDOUT:
1235		case -EPFNOSUPPORT:
1236		case -EPROTONOSUPPORT:
1237		case -EOPNOTSUPP:
1238		case -EINVAL:
1239		case -ECONNREFUSED:
1240		case -ECONNRESET:
1241		case -EHOSTDOWN:
1242		case -EHOSTUNREACH:
1243		case -ENETUNREACH:
1244		case -EADDRINUSE:
1245		case -ENOBUFS:
1246		case -EPIPE:
1247		case -EPERM:
1248		case -EPROTO:
1249		case -ENODEV:
1250			*op_status = status = NFS4ERR_NXIO;
1251			break;
1252		case -EACCES:
1253			*op_status = status = NFS4ERR_ACCESS;
1254			break;
1255		default:
1256			return;
1257		}
1258	}
1259
1260	mirror = FF_LAYOUT_COMP(lseg, idx);
1261	err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1262				       mirror, offset, length, status, opnum,
1263				       nfs_io_gfp_mask());
1264
1265	switch (status) {
1266	case NFS4ERR_DELAY:
1267	case NFS4ERR_GRACE:
1268		break;
1269	case NFS4ERR_NXIO:
1270		ff_layout_mark_ds_unreachable(lseg, idx);
1271		/*
1272		 * Don't return the layout if this is a read and we still
1273		 * have layouts to try
1274		 */
1275		if (opnum == OP_READ)
1276			break;
1277		fallthrough;
1278	default:
1279		pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
1280						  lseg);
1281	}
1282
1283	dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1284}
1285
1286/* NFS_PROTO call done callback routines */
1287static int ff_layout_read_done_cb(struct rpc_task *task,
1288				struct nfs_pgio_header *hdr)
1289{
1290	int err;
1291
1292	if (task->tk_status < 0) {
1293		ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1294					    hdr->args.offset, hdr->args.count,
1295					    &hdr->res.op_status, OP_READ,
1296					    task->tk_status);
1297		trace_ff_layout_read_error(hdr);
1298	}
1299
1300	err = ff_layout_async_handle_error(task, hdr->args.context->state,
1301					   hdr->ds_clp, hdr->lseg,
1302					   hdr->pgio_mirror_idx);
1303
1304	trace_nfs4_pnfs_read(hdr, err);
1305	clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1306	clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1307	switch (err) {
1308	case -NFS4ERR_RESET_TO_PNFS:
1309		set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1310		return task->tk_status;
1311	case -NFS4ERR_RESET_TO_MDS:
1312		set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1313		return task->tk_status;
1314	case -EAGAIN:
1315		goto out_eagain;
1316	}
1317
1318	return 0;
1319out_eagain:
1320	rpc_restart_call_prepare(task);
1321	return -EAGAIN;
1322}
1323
1324static bool
1325ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1326{
1327	return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1328}
1329
1330/*
1331 * We reference the rpc_cred of the first WRITE that triggers the need for
1332 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1333 * rfc5661 is not clear about which credential should be used.
1334 *
1335 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1336 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1337 * we always send layoutcommit after DS writes.
1338 */
1339static void
1340ff_layout_set_layoutcommit(struct inode *inode,
1341		struct pnfs_layout_segment *lseg,
1342		loff_t end_offset)
1343{
1344	if (!ff_layout_need_layoutcommit(lseg))
1345		return;
1346
1347	pnfs_set_layoutcommit(inode, lseg, end_offset);
1348	dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1349		(unsigned long long) NFS_I(inode)->layout->plh_lwb);
1350}
1351
1352static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1353		struct nfs_pgio_header *hdr)
1354{
1355	if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1356		return;
1357	nfs4_ff_layout_stat_io_start_read(hdr->inode,
1358			FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1359			hdr->args.count,
1360			task->tk_start);
1361}
1362
1363static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1364		struct nfs_pgio_header *hdr)
1365{
1366	if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1367		return;
1368	nfs4_ff_layout_stat_io_end_read(task,
1369			FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1370			hdr->args.count,
1371			hdr->res.count);
1372	set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1373}
1374
1375static int ff_layout_read_prepare_common(struct rpc_task *task,
1376					 struct nfs_pgio_header *hdr)
1377{
1378	if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1379		rpc_exit(task, -EIO);
1380		return -EIO;
1381	}
1382
1383	if (!pnfs_is_valid_lseg(hdr->lseg)) {
1384		rpc_exit(task, -EAGAIN);
1385		return -EAGAIN;
1386	}
1387
1388	ff_layout_read_record_layoutstats_start(task, hdr);
1389	return 0;
1390}
1391
1392/*
1393 * Call ops for the async read/write cases
1394 * In the case of dense layouts, the offset needs to be reset to its
1395 * original value.
1396 */
1397static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1398{
1399	struct nfs_pgio_header *hdr = data;
1400
1401	if (ff_layout_read_prepare_common(task, hdr))
1402		return;
1403
1404	rpc_call_start(task);
1405}
1406
1407static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1408{
1409	struct nfs_pgio_header *hdr = data;
1410
1411	if (nfs4_setup_sequence(hdr->ds_clp,
1412				&hdr->args.seq_args,
1413				&hdr->res.seq_res,
1414				task))
1415		return;
1416
1417	ff_layout_read_prepare_common(task, hdr);
1418}
1419
1420static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1421{
1422	struct nfs_pgio_header *hdr = data;
1423
1424	if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1425	    task->tk_status == 0) {
1426		nfs4_sequence_done(task, &hdr->res.seq_res);
1427		return;
1428	}
1429
1430	/* Note this may cause RPC to be resent */
1431	hdr->mds_ops->rpc_call_done(task, hdr);
1432}
1433
1434static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1435{
1436	struct nfs_pgio_header *hdr = data;
1437
1438	ff_layout_read_record_layoutstats_done(task, hdr);
1439	rpc_count_iostats_metrics(task,
1440	    &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1441}
1442
1443static void ff_layout_read_release(void *data)
1444{
1445	struct nfs_pgio_header *hdr = data;
1446
1447	ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1448	if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1449		ff_layout_resend_pnfs_read(hdr);
1450	else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1451		ff_layout_reset_read(hdr);
1452	pnfs_generic_rw_release(data);
1453}
1454
1455
1456static int ff_layout_write_done_cb(struct rpc_task *task,
1457				struct nfs_pgio_header *hdr)
1458{
1459	loff_t end_offs = 0;
1460	int err;
1461
1462	if (task->tk_status < 0) {
1463		ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1464					    hdr->args.offset, hdr->args.count,
1465					    &hdr->res.op_status, OP_WRITE,
1466					    task->tk_status);
1467		trace_ff_layout_write_error(hdr);
1468	}
1469
1470	err = ff_layout_async_handle_error(task, hdr->args.context->state,
1471					   hdr->ds_clp, hdr->lseg,
1472					   hdr->pgio_mirror_idx);
1473
1474	trace_nfs4_pnfs_write(hdr, err);
1475	clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1476	clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1477	switch (err) {
1478	case -NFS4ERR_RESET_TO_PNFS:
1479		set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1480		return task->tk_status;
1481	case -NFS4ERR_RESET_TO_MDS:
1482		set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1483		return task->tk_status;
1484	case -EAGAIN:
1485		return -EAGAIN;
1486	}
1487
1488	if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1489	    hdr->res.verf->committed == NFS_DATA_SYNC)
1490		end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1491
1492	/* Note: if the write is unstable, don't set end_offs until commit */
1493	ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1494
1495	/* zero out fattr since we don't care DS attr at all */
1496	hdr->fattr.valid = 0;
1497	if (task->tk_status >= 0)
1498		nfs_writeback_update_inode(hdr);
1499
1500	return 0;
1501}
1502
1503static int ff_layout_commit_done_cb(struct rpc_task *task,
1504				     struct nfs_commit_data *data)
1505{
1506	int err;
1507
1508	if (task->tk_status < 0) {
1509		ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1510					    data->args.offset, data->args.count,
1511					    &data->res.op_status, OP_COMMIT,
1512					    task->tk_status);
1513		trace_ff_layout_commit_error(data);
1514	}
1515
1516	err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1517					   data->lseg, data->ds_commit_index);
1518
1519	trace_nfs4_pnfs_commit_ds(data, err);
1520	switch (err) {
1521	case -NFS4ERR_RESET_TO_PNFS:
1522		pnfs_generic_prepare_to_resend_writes(data);
1523		return -EAGAIN;
1524	case -NFS4ERR_RESET_TO_MDS:
1525		pnfs_generic_prepare_to_resend_writes(data);
1526		return -EAGAIN;
1527	case -EAGAIN:
1528		rpc_restart_call_prepare(task);
1529		return -EAGAIN;
1530	}
1531
1532	ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1533
1534	return 0;
1535}
1536
1537static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1538		struct nfs_pgio_header *hdr)
1539{
1540	if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1541		return;
1542	nfs4_ff_layout_stat_io_start_write(hdr->inode,
1543			FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1544			hdr->args.count,
1545			task->tk_start);
1546}
1547
1548static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1549		struct nfs_pgio_header *hdr)
1550{
1551	if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1552		return;
1553	nfs4_ff_layout_stat_io_end_write(task,
1554			FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1555			hdr->args.count, hdr->res.count,
1556			hdr->res.verf->committed);
1557	set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1558}
1559
1560static int ff_layout_write_prepare_common(struct rpc_task *task,
1561					  struct nfs_pgio_header *hdr)
1562{
1563	if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1564		rpc_exit(task, -EIO);
1565		return -EIO;
1566	}
1567
1568	if (!pnfs_is_valid_lseg(hdr->lseg)) {
1569		rpc_exit(task, -EAGAIN);
1570		return -EAGAIN;
1571	}
1572
1573	ff_layout_write_record_layoutstats_start(task, hdr);
1574	return 0;
1575}
1576
1577static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1578{
1579	struct nfs_pgio_header *hdr = data;
1580
1581	if (ff_layout_write_prepare_common(task, hdr))
1582		return;
1583
1584	rpc_call_start(task);
1585}
1586
1587static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1588{
1589	struct nfs_pgio_header *hdr = data;
1590
1591	if (nfs4_setup_sequence(hdr->ds_clp,
1592				&hdr->args.seq_args,
1593				&hdr->res.seq_res,
1594				task))
1595		return;
1596
1597	ff_layout_write_prepare_common(task, hdr);
1598}
1599
1600static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1601{
1602	struct nfs_pgio_header *hdr = data;
1603
1604	if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1605	    task->tk_status == 0) {
1606		nfs4_sequence_done(task, &hdr->res.seq_res);
1607		return;
1608	}
1609
1610	/* Note this may cause RPC to be resent */
1611	hdr->mds_ops->rpc_call_done(task, hdr);
1612}
1613
1614static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1615{
1616	struct nfs_pgio_header *hdr = data;
1617
1618	ff_layout_write_record_layoutstats_done(task, hdr);
1619	rpc_count_iostats_metrics(task,
1620	    &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1621}
1622
1623static void ff_layout_write_release(void *data)
1624{
1625	struct nfs_pgio_header *hdr = data;
1626
1627	ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1628	if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1629		ff_layout_send_layouterror(hdr->lseg);
1630		ff_layout_reset_write(hdr, true);
1631	} else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1632		ff_layout_reset_write(hdr, false);
1633	pnfs_generic_rw_release(data);
1634}
1635
1636static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1637		struct nfs_commit_data *cdata)
1638{
1639	if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1640		return;
1641	nfs4_ff_layout_stat_io_start_write(cdata->inode,
1642			FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1643			0, task->tk_start);
1644}
1645
1646static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1647		struct nfs_commit_data *cdata)
1648{
1649	struct nfs_page *req;
1650	__u64 count = 0;
1651
1652	if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1653		return;
1654
1655	if (task->tk_status == 0) {
1656		list_for_each_entry(req, &cdata->pages, wb_list)
1657			count += req->wb_bytes;
1658	}
1659	nfs4_ff_layout_stat_io_end_write(task,
1660			FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1661			count, count, NFS_FILE_SYNC);
1662	set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
1663}
1664
1665static int ff_layout_commit_prepare_common(struct rpc_task *task,
1666					   struct nfs_commit_data *cdata)
1667{
1668	if (!pnfs_is_valid_lseg(cdata->lseg)) {
1669		rpc_exit(task, -EAGAIN);
1670		return -EAGAIN;
1671	}
1672
1673	ff_layout_commit_record_layoutstats_start(task, cdata);
1674	return 0;
1675}
1676
1677static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1678{
1679	if (ff_layout_commit_prepare_common(task, data))
1680		return;
1681
1682	rpc_call_start(task);
1683}
1684
1685static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1686{
1687	struct nfs_commit_data *wdata = data;
1688
1689	if (nfs4_setup_sequence(wdata->ds_clp,
1690				&wdata->args.seq_args,
1691				&wdata->res.seq_res,
1692				task))
1693		return;
1694	ff_layout_commit_prepare_common(task, data);
1695}
1696
1697static void ff_layout_commit_done(struct rpc_task *task, void *data)
1698{
1699	pnfs_generic_write_commit_done(task, data);
1700}
1701
1702static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1703{
1704	struct nfs_commit_data *cdata = data;
1705
1706	ff_layout_commit_record_layoutstats_done(task, cdata);
1707	rpc_count_iostats_metrics(task,
1708	    &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1709}
1710
1711static void ff_layout_commit_release(void *data)
1712{
1713	struct nfs_commit_data *cdata = data;
1714
1715	ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1716	pnfs_generic_commit_release(data);
1717}
1718
1719static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1720	.rpc_call_prepare = ff_layout_read_prepare_v3,
1721	.rpc_call_done = ff_layout_read_call_done,
1722	.rpc_count_stats = ff_layout_read_count_stats,
1723	.rpc_release = ff_layout_read_release,
1724};
1725
1726static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1727	.rpc_call_prepare = ff_layout_read_prepare_v4,
1728	.rpc_call_done = ff_layout_read_call_done,
1729	.rpc_count_stats = ff_layout_read_count_stats,
1730	.rpc_release = ff_layout_read_release,
1731};
1732
1733static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1734	.rpc_call_prepare = ff_layout_write_prepare_v3,
1735	.rpc_call_done = ff_layout_write_call_done,
1736	.rpc_count_stats = ff_layout_write_count_stats,
1737	.rpc_release = ff_layout_write_release,
1738};
1739
1740static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1741	.rpc_call_prepare = ff_layout_write_prepare_v4,
1742	.rpc_call_done = ff_layout_write_call_done,
1743	.rpc_count_stats = ff_layout_write_count_stats,
1744	.rpc_release = ff_layout_write_release,
1745};
1746
1747static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1748	.rpc_call_prepare = ff_layout_commit_prepare_v3,
1749	.rpc_call_done = ff_layout_commit_done,
1750	.rpc_count_stats = ff_layout_commit_count_stats,
1751	.rpc_release = ff_layout_commit_release,
1752};
1753
1754static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1755	.rpc_call_prepare = ff_layout_commit_prepare_v4,
1756	.rpc_call_done = ff_layout_commit_done,
1757	.rpc_count_stats = ff_layout_commit_count_stats,
1758	.rpc_release = ff_layout_commit_release,
1759};
1760
1761static enum pnfs_try_status
1762ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1763{
1764	struct pnfs_layout_segment *lseg = hdr->lseg;
1765	struct nfs4_pnfs_ds *ds;
1766	struct rpc_clnt *ds_clnt;
 
1767	struct nfs4_ff_layout_mirror *mirror;
1768	const struct cred *ds_cred;
1769	loff_t offset = hdr->args.offset;
1770	u32 idx = hdr->pgio_mirror_idx;
1771	int vers;
1772	struct nfs_fh *fh;
1773
1774	dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1775		__func__, hdr->inode->i_ino,
1776		hdr->args.pgbase, (size_t)hdr->args.count, offset);
1777
1778	mirror = FF_LAYOUT_COMP(lseg, idx);
1779	ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
1780	if (!ds)
1781		goto out_failed;
1782
1783	ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1784						   hdr->inode);
1785	if (IS_ERR(ds_clnt))
1786		goto out_failed;
1787
1788	ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1789	if (!ds_cred)
1790		goto out_failed;
1791
1792	vers = nfs4_ff_layout_ds_version(mirror);
1793
1794	dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1795		ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
1796
1797	hdr->pgio_done_cb = ff_layout_read_done_cb;
1798	refcount_inc(&ds->ds_clp->cl_count);
1799	hdr->ds_clp = ds->ds_clp;
1800	fh = nfs4_ff_layout_select_ds_fh(mirror);
1801	if (fh)
1802		hdr->args.fh = fh;
1803
1804	nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1805
1806	/*
1807	 * Note that if we ever decide to split across DSes,
1808	 * then we may need to handle dense-like offsets.
1809	 */
1810	hdr->args.offset = offset;
1811	hdr->mds_offset = offset;
1812
 
 
 
 
 
 
 
1813	/* Perform an asynchronous read to ds */
1814	nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1815			  vers == 3 ? &ff_layout_read_call_ops_v3 :
1816				      &ff_layout_read_call_ops_v4,
1817			  0, RPC_TASK_SOFTCONN);
1818	put_cred(ds_cred);
1819	return PNFS_ATTEMPTED;
1820
1821out_failed:
1822	if (ff_layout_avoid_mds_available_ds(lseg))
1823		return PNFS_TRY_AGAIN;
1824	trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
1825			hdr->args.offset, hdr->args.count,
1826			IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
1827	return PNFS_NOT_ATTEMPTED;
1828}
1829
1830/* Perform async writes. */
1831static enum pnfs_try_status
1832ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1833{
1834	struct pnfs_layout_segment *lseg = hdr->lseg;
1835	struct nfs4_pnfs_ds *ds;
1836	struct rpc_clnt *ds_clnt;
 
1837	struct nfs4_ff_layout_mirror *mirror;
1838	const struct cred *ds_cred;
1839	loff_t offset = hdr->args.offset;
1840	int vers;
1841	struct nfs_fh *fh;
1842	u32 idx = hdr->pgio_mirror_idx;
1843
1844	mirror = FF_LAYOUT_COMP(lseg, idx);
1845	ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1846	if (!ds)
1847		goto out_failed;
1848
1849	ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1850						   hdr->inode);
1851	if (IS_ERR(ds_clnt))
1852		goto out_failed;
1853
1854	ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1855	if (!ds_cred)
1856		goto out_failed;
1857
1858	vers = nfs4_ff_layout_ds_version(mirror);
1859
1860	dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1861		__func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1862		offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
1863		vers);
1864
1865	hdr->pgio_done_cb = ff_layout_write_done_cb;
1866	refcount_inc(&ds->ds_clp->cl_count);
1867	hdr->ds_clp = ds->ds_clp;
1868	hdr->ds_commit_idx = idx;
1869	fh = nfs4_ff_layout_select_ds_fh(mirror);
1870	if (fh)
1871		hdr->args.fh = fh;
1872
1873	nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1874
1875	/*
1876	 * Note that if we ever decide to split across DSes,
1877	 * then we may need to handle dense-like offsets.
1878	 */
1879	hdr->args.offset = offset;
1880
 
 
 
 
 
 
 
 
1881	/* Perform an asynchronous write */
1882	nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1883			  vers == 3 ? &ff_layout_write_call_ops_v3 :
1884				      &ff_layout_write_call_ops_v4,
1885			  sync, RPC_TASK_SOFTCONN);
1886	put_cred(ds_cred);
1887	return PNFS_ATTEMPTED;
1888
1889out_failed:
1890	if (ff_layout_avoid_mds_available_ds(lseg))
1891		return PNFS_TRY_AGAIN;
1892	trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
1893			hdr->args.offset, hdr->args.count,
1894			IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
1895	return PNFS_NOT_ATTEMPTED;
1896}
1897
1898static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1899{
1900	return i;
1901}
1902
1903static struct nfs_fh *
1904select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1905{
1906	struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1907
1908	/* FIXME: Assume that there is only one NFS version available
1909	 * for the DS.
1910	 */
1911	return &flseg->mirror_array[i]->fh_versions[0];
1912}
1913
1914static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1915{
1916	struct pnfs_layout_segment *lseg = data->lseg;
1917	struct nfs4_pnfs_ds *ds;
1918	struct rpc_clnt *ds_clnt;
 
1919	struct nfs4_ff_layout_mirror *mirror;
1920	const struct cred *ds_cred;
1921	u32 idx;
1922	int vers, ret;
1923	struct nfs_fh *fh;
1924
1925	if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1926	    test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1927		goto out_err;
1928
1929	idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1930	mirror = FF_LAYOUT_COMP(lseg, idx);
1931	ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1932	if (!ds)
1933		goto out_err;
1934
1935	ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1936						   data->inode);
1937	if (IS_ERR(ds_clnt))
1938		goto out_err;
1939
1940	ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
1941	if (!ds_cred)
1942		goto out_err;
1943
1944	vers = nfs4_ff_layout_ds_version(mirror);
1945
1946	dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1947		data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
1948		vers);
1949	data->commit_done_cb = ff_layout_commit_done_cb;
1950	data->cred = ds_cred;
1951	refcount_inc(&ds->ds_clp->cl_count);
1952	data->ds_clp = ds->ds_clp;
1953	fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1954	if (fh)
1955		data->args.fh = fh;
1956
 
 
 
 
 
 
 
 
1957	ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1958				   vers == 3 ? &ff_layout_commit_call_ops_v3 :
1959					       &ff_layout_commit_call_ops_v4,
1960				   how, RPC_TASK_SOFTCONN);
1961	put_cred(ds_cred);
1962	return ret;
1963out_err:
1964	pnfs_generic_prepare_to_resend_writes(data);
1965	pnfs_generic_commit_release(data);
1966	return -EAGAIN;
1967}
1968
1969static int
1970ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1971			   int how, struct nfs_commit_info *cinfo)
1972{
1973	return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1974					    ff_layout_initiate_commit);
1975}
1976
1977static bool ff_layout_match_rw(const struct rpc_task *task,
1978			       const struct nfs_pgio_header *hdr,
1979			       const struct pnfs_layout_segment *lseg)
1980{
1981	return hdr->lseg == lseg;
1982}
1983
1984static bool ff_layout_match_commit(const struct rpc_task *task,
1985				   const struct nfs_commit_data *cdata,
1986				   const struct pnfs_layout_segment *lseg)
1987{
1988	return cdata->lseg == lseg;
1989}
1990
1991static bool ff_layout_match_io(const struct rpc_task *task, const void *data)
1992{
1993	const struct rpc_call_ops *ops = task->tk_ops;
1994
1995	if (ops == &ff_layout_read_call_ops_v3 ||
1996	    ops == &ff_layout_read_call_ops_v4 ||
1997	    ops == &ff_layout_write_call_ops_v3 ||
1998	    ops == &ff_layout_write_call_ops_v4)
1999		return ff_layout_match_rw(task, task->tk_calldata, data);
2000	if (ops == &ff_layout_commit_call_ops_v3 ||
2001	    ops == &ff_layout_commit_call_ops_v4)
2002		return ff_layout_match_commit(task, task->tk_calldata, data);
2003	return false;
2004}
2005
2006static void ff_layout_cancel_io(struct pnfs_layout_segment *lseg)
2007{
2008	struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
2009	struct nfs4_ff_layout_mirror *mirror;
2010	struct nfs4_ff_layout_ds *mirror_ds;
2011	struct nfs4_pnfs_ds *ds;
2012	struct nfs_client *ds_clp;
2013	struct rpc_clnt *clnt;
2014	u32 idx;
2015
2016	for (idx = 0; idx < flseg->mirror_array_cnt; idx++) {
2017		mirror = flseg->mirror_array[idx];
2018		mirror_ds = mirror->mirror_ds;
2019		if (IS_ERR_OR_NULL(mirror_ds))
2020			continue;
2021		ds = mirror->mirror_ds->ds;
2022		if (!ds)
2023			continue;
2024		ds_clp = ds->ds_clp;
2025		if (!ds_clp)
2026			continue;
2027		clnt = ds_clp->cl_rpcclient;
2028		if (!clnt)
2029			continue;
2030		if (!rpc_cancel_tasks(clnt, -EAGAIN, ff_layout_match_io, lseg))
2031			continue;
2032		rpc_clnt_disconnect(clnt);
2033	}
2034}
2035
2036static struct pnfs_ds_commit_info *
2037ff_layout_get_ds_info(struct inode *inode)
2038{
2039	struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
2040
2041	if (layout == NULL)
2042		return NULL;
2043
2044	return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
2045}
2046
2047static void
2048ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
2049		struct pnfs_layout_segment *lseg)
2050{
2051	struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
2052	struct inode *inode = lseg->pls_layout->plh_inode;
2053	struct pnfs_commit_array *array, *new;
2054
2055	new = pnfs_alloc_commit_array(flseg->mirror_array_cnt,
2056				      nfs_io_gfp_mask());
2057	if (new) {
2058		spin_lock(&inode->i_lock);
2059		array = pnfs_add_commit_array(fl_cinfo, new, lseg);
2060		spin_unlock(&inode->i_lock);
2061		if (array != new)
2062			pnfs_free_commit_array(new);
2063	}
2064}
2065
2066static void
2067ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
2068		struct inode *inode)
2069{
2070	spin_lock(&inode->i_lock);
2071	pnfs_generic_ds_cinfo_destroy(fl_cinfo);
2072	spin_unlock(&inode->i_lock);
2073}
2074
2075static void
2076ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
2077{
2078	nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
2079						  id_node));
2080}
2081
2082static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
2083				  const struct nfs4_layoutreturn_args *args,
2084				  const struct nfs4_flexfile_layoutreturn_args *ff_args)
2085{
2086	__be32 *start;
2087
2088	start = xdr_reserve_space(xdr, 4);
2089	if (unlikely(!start))
2090		return -E2BIG;
2091
2092	*start = cpu_to_be32(ff_args->num_errors);
2093	/* This assume we always return _ALL_ layouts */
2094	return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
2095}
2096
2097static void
2098encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
2099{
2100	WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
2101}
2102
2103static void
2104ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2105			    const nfs4_stateid *stateid,
2106			    const struct nfs42_layoutstat_devinfo *devinfo)
2107{
2108	__be32 *p;
2109
2110	p = xdr_reserve_space(xdr, 8 + 8);
2111	p = xdr_encode_hyper(p, devinfo->offset);
2112	p = xdr_encode_hyper(p, devinfo->length);
2113	encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2114	p = xdr_reserve_space(xdr, 4*8);
2115	p = xdr_encode_hyper(p, devinfo->read_count);
2116	p = xdr_encode_hyper(p, devinfo->read_bytes);
2117	p = xdr_encode_hyper(p, devinfo->write_count);
2118	p = xdr_encode_hyper(p, devinfo->write_bytes);
2119	encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2120}
2121
2122static void
2123ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2124			    const nfs4_stateid *stateid,
2125			    const struct nfs42_layoutstat_devinfo *devinfo)
2126{
2127	ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2128	ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2129			devinfo->ld_private.data);
2130}
2131
2132/* report nothing for now */
2133static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2134		const struct nfs4_layoutreturn_args *args,
2135		struct nfs4_flexfile_layoutreturn_args *ff_args)
2136{
2137	__be32 *p;
2138	int i;
2139
2140	p = xdr_reserve_space(xdr, 4);
2141	*p = cpu_to_be32(ff_args->num_dev);
2142	for (i = 0; i < ff_args->num_dev; i++)
2143		ff_layout_encode_ff_iostat(xdr,
2144				&args->layout->plh_stateid,
2145				&ff_args->devinfo[i]);
2146}
2147
2148static void
2149ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2150		unsigned int num_entries)
2151{
2152	unsigned int i;
2153
2154	for (i = 0; i < num_entries; i++) {
2155		if (!devinfo[i].ld_private.ops)
2156			continue;
2157		if (!devinfo[i].ld_private.ops->free)
2158			continue;
2159		devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2160	}
2161}
2162
2163static struct nfs4_deviceid_node *
2164ff_layout_alloc_deviceid_node(struct nfs_server *server,
2165			      struct pnfs_device *pdev, gfp_t gfp_flags)
2166{
2167	struct nfs4_ff_layout_ds *dsaddr;
2168
2169	dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2170	if (!dsaddr)
2171		return NULL;
2172	return &dsaddr->id_node;
2173}
2174
2175static void
2176ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2177		const void *voidargs,
2178		const struct nfs4_xdr_opaque_data *ff_opaque)
2179{
2180	const struct nfs4_layoutreturn_args *args = voidargs;
2181	struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2182	struct xdr_buf tmp_buf = {
2183		.head = {
2184			[0] = {
2185				.iov_base = page_address(ff_args->pages[0]),
2186			},
2187		},
2188		.buflen = PAGE_SIZE,
2189	};
2190	struct xdr_stream tmp_xdr;
2191	__be32 *start;
2192
2193	dprintk("%s: Begin\n", __func__);
2194
2195	xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
2196
2197	ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2198	ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2199
2200	start = xdr_reserve_space(xdr, 4);
2201	*start = cpu_to_be32(tmp_buf.len);
2202	xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2203
2204	dprintk("%s: Return\n", __func__);
2205}
2206
2207static void
2208ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2209{
2210	struct nfs4_flexfile_layoutreturn_args *ff_args;
2211
2212	if (!args->data)
2213		return;
2214	ff_args = args->data;
2215	args->data = NULL;
2216
2217	ff_layout_free_ds_ioerr(&ff_args->errors);
2218	ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2219
2220	put_page(ff_args->pages[0]);
2221	kfree(ff_args);
2222}
2223
2224static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2225	.encode = ff_layout_encode_layoutreturn,
2226	.free = ff_layout_free_layoutreturn,
2227};
2228
2229static int
2230ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2231{
2232	struct nfs4_flexfile_layoutreturn_args *ff_args;
2233	struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2234
2235	ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask());
2236	if (!ff_args)
2237		goto out_nomem;
2238	ff_args->pages[0] = alloc_page(nfs_io_gfp_mask());
2239	if (!ff_args->pages[0])
2240		goto out_nomem_free;
2241
2242	INIT_LIST_HEAD(&ff_args->errors);
2243	ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2244			&args->range, &ff_args->errors,
2245			FF_LAYOUTRETURN_MAXERR);
2246
2247	spin_lock(&args->inode->i_lock);
2248	ff_args->num_dev = ff_layout_mirror_prepare_stats(
2249		&ff_layout->generic_hdr, &ff_args->devinfo[0],
2250		ARRAY_SIZE(ff_args->devinfo), NFS4_FF_OP_LAYOUTRETURN);
2251	spin_unlock(&args->inode->i_lock);
2252
2253	args->ld_private->ops = &layoutreturn_ops;
2254	args->ld_private->data = ff_args;
2255	return 0;
2256out_nomem_free:
2257	kfree(ff_args);
2258out_nomem:
2259	return -ENOMEM;
2260}
2261
2262#ifdef CONFIG_NFS_V4_2
2263void
2264ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2265{
2266	struct pnfs_layout_hdr *lo = lseg->pls_layout;
2267	struct nfs42_layout_error *errors;
2268	LIST_HEAD(head);
2269
2270	if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2271		return;
2272	ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2273	if (list_empty(&head))
2274		return;
2275
2276	errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors),
2277			       nfs_io_gfp_mask());
2278	if (errors != NULL) {
2279		const struct nfs4_ff_layout_ds_err *pos;
2280		size_t n = 0;
2281
2282		list_for_each_entry(pos, &head, list) {
2283			errors[n].offset = pos->offset;
2284			errors[n].length = pos->length;
2285			nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2286			errors[n].errors[0].dev_id = pos->deviceid;
2287			errors[n].errors[0].status = pos->status;
2288			errors[n].errors[0].opnum = pos->opnum;
2289			n++;
2290			if (!list_is_last(&pos->list, &head) &&
2291			    n < NFS42_LAYOUTERROR_MAX)
2292				continue;
2293			if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2294				break;
2295			n = 0;
2296		}
2297		kfree(errors);
2298	}
2299	ff_layout_free_ds_ioerr(&head);
2300}
2301#else
2302void
2303ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2304{
2305}
2306#endif
2307
2308static int
2309ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2310{
2311	const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2312
2313	return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2314}
2315
2316static size_t
2317ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2318			  const int buflen)
2319{
2320	const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2321	const struct in6_addr *addr = &sin6->sin6_addr;
2322
2323	/*
2324	 * RFC 4291, Section 2.2.2
2325	 *
2326	 * Shorthanded ANY address
2327	 */
2328	if (ipv6_addr_any(addr))
2329		return snprintf(buf, buflen, "::");
2330
2331	/*
2332	 * RFC 4291, Section 2.2.2
2333	 *
2334	 * Shorthanded loopback address
2335	 */
2336	if (ipv6_addr_loopback(addr))
2337		return snprintf(buf, buflen, "::1");
2338
2339	/*
2340	 * RFC 4291, Section 2.2.3
2341	 *
2342	 * Special presentation address format for mapped v4
2343	 * addresses.
2344	 */
2345	if (ipv6_addr_v4mapped(addr))
2346		return snprintf(buf, buflen, "::ffff:%pI4",
2347					&addr->s6_addr32[3]);
2348
2349	/*
2350	 * RFC 4291, Section 2.2.1
2351	 */
2352	return snprintf(buf, buflen, "%pI6c", addr);
2353}
2354
2355/* Derived from rpc_sockaddr2uaddr */
2356static void
2357ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2358{
2359	struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2360	char portbuf[RPCBIND_MAXUADDRPLEN];
2361	char addrbuf[RPCBIND_MAXUADDRLEN];
2362	unsigned short port;
2363	int len, netid_len;
2364	__be32 *p;
2365
2366	switch (sap->sa_family) {
2367	case AF_INET:
2368		if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2369			return;
2370		port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2371		break;
2372	case AF_INET6:
2373		if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2374			return;
2375		port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2376		break;
2377	default:
2378		WARN_ON_ONCE(1);
2379		return;
2380	}
2381
2382	snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2383	len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2384
2385	netid_len = strlen(da->da_netid);
2386	p = xdr_reserve_space(xdr, 4 + netid_len);
2387	xdr_encode_opaque(p, da->da_netid, netid_len);
2388
2389	p = xdr_reserve_space(xdr, 4 + len);
2390	xdr_encode_opaque(p, addrbuf, len);
2391}
2392
2393static void
2394ff_layout_encode_nfstime(struct xdr_stream *xdr,
2395			 ktime_t t)
2396{
2397	struct timespec64 ts;
2398	__be32 *p;
2399
2400	p = xdr_reserve_space(xdr, 12);
2401	ts = ktime_to_timespec64(t);
2402	p = xdr_encode_hyper(p, ts.tv_sec);
2403	*p++ = cpu_to_be32(ts.tv_nsec);
2404}
2405
2406static void
2407ff_layout_encode_io_latency(struct xdr_stream *xdr,
2408			    struct nfs4_ff_io_stat *stat)
2409{
2410	__be32 *p;
2411
2412	p = xdr_reserve_space(xdr, 5 * 8);
2413	p = xdr_encode_hyper(p, stat->ops_requested);
2414	p = xdr_encode_hyper(p, stat->bytes_requested);
2415	p = xdr_encode_hyper(p, stat->ops_completed);
2416	p = xdr_encode_hyper(p, stat->bytes_completed);
2417	p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2418	ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2419	ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2420}
2421
2422static void
2423ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2424			      const struct nfs42_layoutstat_devinfo *devinfo,
2425			      struct nfs4_ff_layout_mirror *mirror)
2426{
2427	struct nfs4_pnfs_ds_addr *da;
2428	struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2429	struct nfs_fh *fh = &mirror->fh_versions[0];
2430	__be32 *p;
2431
2432	da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2433	dprintk("%s: DS %s: encoding address %s\n",
2434		__func__, ds->ds_remotestr, da->da_remotestr);
2435	/* netaddr4 */
2436	ff_layout_encode_netaddr(xdr, da);
2437	/* nfs_fh4 */
2438	p = xdr_reserve_space(xdr, 4 + fh->size);
2439	xdr_encode_opaque(p, fh->data, fh->size);
2440	/* ff_io_latency4 read */
2441	spin_lock(&mirror->lock);
2442	ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2443	/* ff_io_latency4 write */
2444	ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2445	spin_unlock(&mirror->lock);
2446	/* nfstime4 */
2447	ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2448	/* bool */
2449	p = xdr_reserve_space(xdr, 4);
2450	*p = cpu_to_be32(false);
2451}
2452
2453static void
2454ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2455			     const struct nfs4_xdr_opaque_data *opaque)
2456{
2457	struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2458			struct nfs42_layoutstat_devinfo, ld_private);
2459	__be32 *start;
2460
2461	/* layoutupdate length */
2462	start = xdr_reserve_space(xdr, 4);
2463	ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2464
2465	*start = cpu_to_be32((xdr->p - start - 1) * 4);
2466}
2467
2468static void
2469ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2470{
2471	struct nfs4_ff_layout_mirror *mirror = opaque->data;
2472
2473	ff_layout_put_mirror(mirror);
2474}
2475
2476static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2477	.encode = ff_layout_encode_layoutstats,
2478	.free	= ff_layout_free_layoutstats,
2479};
2480
2481static int
2482ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2483			       struct nfs42_layoutstat_devinfo *devinfo,
2484			       int dev_limit, enum nfs4_ff_op_type type)
2485{
2486	struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2487	struct nfs4_ff_layout_mirror *mirror;
2488	struct nfs4_deviceid_node *dev;
2489	int i = 0;
2490
2491	list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2492		if (i >= dev_limit)
2493			break;
2494		if (IS_ERR_OR_NULL(mirror->mirror_ds))
2495			continue;
2496		if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL,
2497					&mirror->flags) &&
2498		    type != NFS4_FF_OP_LAYOUTRETURN)
2499			continue;
2500		/* mirror refcount put in cleanup_layoutstats */
2501		if (!refcount_inc_not_zero(&mirror->ref))
2502			continue;
2503		dev = &mirror->mirror_ds->id_node; 
2504		memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2505		devinfo->offset = 0;
2506		devinfo->length = NFS4_MAX_UINT64;
2507		spin_lock(&mirror->lock);
2508		devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2509		devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2510		devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2511		devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2512		spin_unlock(&mirror->lock);
2513		devinfo->layout_type = LAYOUT_FLEX_FILES;
2514		devinfo->ld_private.ops = &layoutstat_ops;
2515		devinfo->ld_private.data = mirror;
2516
2517		devinfo++;
2518		i++;
2519	}
2520	return i;
2521}
2522
2523static int ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2524{
2525	struct pnfs_layout_hdr *lo;
2526	struct nfs4_flexfile_layout *ff_layout;
2527	const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2528
2529	/* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2530	args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo),
2531				      nfs_io_gfp_mask());
2532	if (!args->devinfo)
2533		return -ENOMEM;
2534
2535	spin_lock(&args->inode->i_lock);
2536	lo = NFS_I(args->inode)->layout;
2537	if (lo && pnfs_layout_is_valid(lo)) {
2538		ff_layout = FF_LAYOUT_FROM_HDR(lo);
2539		args->num_dev = ff_layout_mirror_prepare_stats(
2540			&ff_layout->generic_hdr, &args->devinfo[0], dev_count,
2541			NFS4_FF_OP_LAYOUTSTATS);
2542	} else
2543		args->num_dev = 0;
2544	spin_unlock(&args->inode->i_lock);
2545	if (!args->num_dev) {
2546		kfree(args->devinfo);
2547		args->devinfo = NULL;
2548		return -ENOENT;
2549	}
2550
2551	return 0;
2552}
2553
2554static int
2555ff_layout_set_layoutdriver(struct nfs_server *server,
2556		const struct nfs_fh *dummy)
2557{
2558#if IS_ENABLED(CONFIG_NFS_V4_2)
2559	server->caps |= NFS_CAP_LAYOUTSTATS;
2560#endif
2561	return 0;
2562}
2563
2564static const struct pnfs_commit_ops ff_layout_commit_ops = {
2565	.setup_ds_info		= ff_layout_setup_ds_info,
2566	.release_ds_info	= ff_layout_release_ds_info,
2567	.mark_request_commit	= pnfs_layout_mark_request_commit,
2568	.clear_request_commit	= pnfs_generic_clear_request_commit,
2569	.scan_commit_lists	= pnfs_generic_scan_commit_lists,
2570	.recover_commit_reqs	= pnfs_generic_recover_commit_reqs,
2571	.commit_pagelist	= ff_layout_commit_pagelist,
2572};
2573
2574static struct pnfs_layoutdriver_type flexfilelayout_type = {
2575	.id			= LAYOUT_FLEX_FILES,
2576	.name			= "LAYOUT_FLEX_FILES",
2577	.owner			= THIS_MODULE,
2578	.flags			= PNFS_LAYOUTGET_ON_OPEN,
2579	.max_layoutget_response	= 4096, /* 1 page or so... */
2580	.set_layoutdriver	= ff_layout_set_layoutdriver,
2581	.alloc_layout_hdr	= ff_layout_alloc_layout_hdr,
2582	.free_layout_hdr	= ff_layout_free_layout_hdr,
2583	.alloc_lseg		= ff_layout_alloc_lseg,
2584	.free_lseg		= ff_layout_free_lseg,
2585	.add_lseg		= ff_layout_add_lseg,
2586	.pg_read_ops		= &ff_layout_pg_read_ops,
2587	.pg_write_ops		= &ff_layout_pg_write_ops,
2588	.get_ds_info		= ff_layout_get_ds_info,
2589	.free_deviceid_node	= ff_layout_free_deviceid_node,
2590	.read_pagelist		= ff_layout_read_pagelist,
2591	.write_pagelist		= ff_layout_write_pagelist,
2592	.alloc_deviceid_node    = ff_layout_alloc_deviceid_node,
2593	.prepare_layoutreturn   = ff_layout_prepare_layoutreturn,
2594	.sync			= pnfs_nfs_generic_sync,
2595	.prepare_layoutstats	= ff_layout_prepare_layoutstats,
2596	.cancel_io		= ff_layout_cancel_io,
2597};
2598
2599static int __init nfs4flexfilelayout_init(void)
2600{
2601	printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2602	       __func__);
2603	return pnfs_register_layoutdriver(&flexfilelayout_type);
2604}
2605
2606static void __exit nfs4flexfilelayout_exit(void)
2607{
2608	printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2609	       __func__);
2610	pnfs_unregister_layoutdriver(&flexfilelayout_type);
2611}
2612
2613MODULE_ALIAS("nfs-layouttype4-4");
2614
2615MODULE_LICENSE("GPL");
2616MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2617
2618module_init(nfs4flexfilelayout_init);
2619module_exit(nfs4flexfilelayout_exit);
2620
2621module_param(io_maxretrans, ushort, 0644);
2622MODULE_PARM_DESC(io_maxretrans, "The  number of times the NFSv4.1 client "
2623			"retries an I/O request before returning an error. ");