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v4.17
   1/*
   2 *  pNFS functions to call and manage layout drivers.
   3 *
   4 *  Copyright (c) 2002 [year of first publication]
   5 *  The Regents of the University of Michigan
   6 *  All Rights Reserved
   7 *
   8 *  Dean Hildebrand <dhildebz@umich.edu>
   9 *
  10 *  Permission is granted to use, copy, create derivative works, and
  11 *  redistribute this software and such derivative works for any purpose,
  12 *  so long as the name of the University of Michigan is not used in
  13 *  any advertising or publicity pertaining to the use or distribution
  14 *  of this software without specific, written prior authorization. If
  15 *  the above copyright notice or any other identification of the
  16 *  University of Michigan is included in any copy of any portion of
  17 *  this software, then the disclaimer below must also be included.
  18 *
  19 *  This software is provided as is, without representation or warranty
  20 *  of any kind either express or implied, including without limitation
  21 *  the implied warranties of merchantability, fitness for a particular
  22 *  purpose, or noninfringement.  The Regents of the University of
  23 *  Michigan shall not be liable for any damages, including special,
  24 *  indirect, incidental, or consequential damages, with respect to any
  25 *  claim arising out of or in connection with the use of the software,
  26 *  even if it has been or is hereafter advised of the possibility of
  27 *  such damages.
  28 */
  29
  30#include <linux/nfs_fs.h>
  31#include <linux/nfs_page.h>
  32#include <linux/module.h>
  33#include <linux/sort.h>
  34#include "internal.h"
  35#include "pnfs.h"
  36#include "iostat.h"
  37#include "nfs4trace.h"
  38#include "delegation.h"
  39#include "nfs42.h"
 
  40
  41#define NFSDBG_FACILITY		NFSDBG_PNFS
  42#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
  43
  44/* Locking:
  45 *
  46 * pnfs_spinlock:
  47 *      protects pnfs_modules_tbl.
  48 */
  49static DEFINE_SPINLOCK(pnfs_spinlock);
  50
  51/*
  52 * pnfs_modules_tbl holds all pnfs modules
  53 */
  54static LIST_HEAD(pnfs_modules_tbl);
  55
  56static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
  57static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
  58		struct list_head *free_me,
  59		const struct pnfs_layout_range *range,
  60		u32 seq);
  61static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
  62		                struct list_head *tmp_list);
  63
  64/* Return the registered pnfs layout driver module matching given id */
  65static struct pnfs_layoutdriver_type *
  66find_pnfs_driver_locked(u32 id)
  67{
  68	struct pnfs_layoutdriver_type *local;
  69
  70	list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
  71		if (local->id == id)
  72			goto out;
  73	local = NULL;
  74out:
  75	dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
  76	return local;
  77}
  78
  79static struct pnfs_layoutdriver_type *
  80find_pnfs_driver(u32 id)
  81{
  82	struct pnfs_layoutdriver_type *local;
  83
  84	spin_lock(&pnfs_spinlock);
  85	local = find_pnfs_driver_locked(id);
  86	if (local != NULL && !try_module_get(local->owner)) {
  87		dprintk("%s: Could not grab reference on module\n", __func__);
  88		local = NULL;
  89	}
  90	spin_unlock(&pnfs_spinlock);
  91	return local;
  92}
  93
  94void
  95unset_pnfs_layoutdriver(struct nfs_server *nfss)
  96{
  97	if (nfss->pnfs_curr_ld) {
  98		if (nfss->pnfs_curr_ld->clear_layoutdriver)
  99			nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
 100		/* Decrement the MDS count. Purge the deviceid cache if zero */
 101		if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
 102			nfs4_deviceid_purge_client(nfss->nfs_client);
 103		module_put(nfss->pnfs_curr_ld->owner);
 104	}
 105	nfss->pnfs_curr_ld = NULL;
 106}
 107
 108/*
 109 * When the server sends a list of layout types, we choose one in the order
 110 * given in the list below.
 111 *
 112 * FIXME: should this list be configurable in some fashion? module param?
 113 * 	  mount option? something else?
 114 */
 115static const u32 ld_prefs[] = {
 116	LAYOUT_SCSI,
 117	LAYOUT_BLOCK_VOLUME,
 118	LAYOUT_OSD2_OBJECTS,
 119	LAYOUT_FLEX_FILES,
 120	LAYOUT_NFSV4_1_FILES,
 121	0
 122};
 123
 124static int
 125ld_cmp(const void *e1, const void *e2)
 126{
 127	u32 ld1 = *((u32 *)e1);
 128	u32 ld2 = *((u32 *)e2);
 129	int i;
 130
 131	for (i = 0; ld_prefs[i] != 0; i++) {
 132		if (ld1 == ld_prefs[i])
 133			return -1;
 134
 135		if (ld2 == ld_prefs[i])
 136			return 1;
 137	}
 138	return 0;
 139}
 140
 141/*
 142 * Try to set the server's pnfs module to the pnfs layout type specified by id.
 143 * Currently only one pNFS layout driver per filesystem is supported.
 144 *
 145 * @ids array of layout types supported by MDS.
 146 */
 147void
 148set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
 149		      struct nfs_fsinfo *fsinfo)
 150{
 151	struct pnfs_layoutdriver_type *ld_type = NULL;
 152	u32 id;
 153	int i;
 154
 155	if (fsinfo->nlayouttypes == 0)
 156		goto out_no_driver;
 157	if (!(server->nfs_client->cl_exchange_flags &
 158		 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
 159		printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
 160			__func__, server->nfs_client->cl_exchange_flags);
 161		goto out_no_driver;
 162	}
 163
 164	sort(fsinfo->layouttype, fsinfo->nlayouttypes,
 165		sizeof(*fsinfo->layouttype), ld_cmp, NULL);
 166
 167	for (i = 0; i < fsinfo->nlayouttypes; i++) {
 168		id = fsinfo->layouttype[i];
 169		ld_type = find_pnfs_driver(id);
 170		if (!ld_type) {
 171			request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
 172					id);
 173			ld_type = find_pnfs_driver(id);
 174		}
 175		if (ld_type)
 176			break;
 177	}
 178
 179	if (!ld_type) {
 180		dprintk("%s: No pNFS module found!\n", __func__);
 181		goto out_no_driver;
 182	}
 183
 184	server->pnfs_curr_ld = ld_type;
 185	if (ld_type->set_layoutdriver
 186	    && ld_type->set_layoutdriver(server, mntfh)) {
 187		printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
 188			"driver %u.\n", __func__, id);
 189		module_put(ld_type->owner);
 190		goto out_no_driver;
 191	}
 192	/* Bump the MDS count */
 193	atomic_inc(&server->nfs_client->cl_mds_count);
 194
 195	dprintk("%s: pNFS module for %u set\n", __func__, id);
 196	return;
 197
 198out_no_driver:
 199	dprintk("%s: Using NFSv4 I/O\n", __func__);
 200	server->pnfs_curr_ld = NULL;
 201}
 202
 203int
 204pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
 205{
 206	int status = -EINVAL;
 207	struct pnfs_layoutdriver_type *tmp;
 208
 209	if (ld_type->id == 0) {
 210		printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
 211		return status;
 212	}
 213	if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
 214		printk(KERN_ERR "NFS: %s Layout driver must provide "
 215		       "alloc_lseg and free_lseg.\n", __func__);
 216		return status;
 217	}
 218
 219	spin_lock(&pnfs_spinlock);
 220	tmp = find_pnfs_driver_locked(ld_type->id);
 221	if (!tmp) {
 222		list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
 223		status = 0;
 224		dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
 225			ld_type->name);
 226	} else {
 227		printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
 228			__func__, ld_type->id);
 229	}
 230	spin_unlock(&pnfs_spinlock);
 231
 232	return status;
 233}
 234EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
 235
 236void
 237pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
 238{
 239	dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
 240	spin_lock(&pnfs_spinlock);
 241	list_del(&ld_type->pnfs_tblid);
 242	spin_unlock(&pnfs_spinlock);
 243}
 244EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
 245
 246/*
 247 * pNFS client layout cache
 248 */
 249
 250/* Need to hold i_lock if caller does not already hold reference */
 251void
 252pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
 253{
 254	refcount_inc(&lo->plh_refcount);
 255}
 256
 257static struct pnfs_layout_hdr *
 258pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
 259{
 260	struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
 261	return ld->alloc_layout_hdr(ino, gfp_flags);
 262}
 263
 264static void
 265pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
 266{
 267	struct nfs_server *server = NFS_SERVER(lo->plh_inode);
 268	struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
 269
 270	if (!list_empty(&lo->plh_layouts)) {
 271		struct nfs_client *clp = server->nfs_client;
 272
 273		spin_lock(&clp->cl_lock);
 274		list_del_init(&lo->plh_layouts);
 275		spin_unlock(&clp->cl_lock);
 276	}
 277	put_rpccred(lo->plh_lc_cred);
 278	return ld->free_layout_hdr(lo);
 279}
 280
 281static void
 282pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
 283{
 284	struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
 285	dprintk("%s: freeing layout cache %p\n", __func__, lo);
 286	nfsi->layout = NULL;
 287	/* Reset MDS Threshold I/O counters */
 288	nfsi->write_io = 0;
 289	nfsi->read_io = 0;
 290}
 291
 292void
 293pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
 294{
 295	struct inode *inode;
 
 296
 297	if (!lo)
 298		return;
 299	inode = lo->plh_inode;
 300	pnfs_layoutreturn_before_put_layout_hdr(lo);
 301
 302	if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
 303		if (!list_empty(&lo->plh_segs))
 304			WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
 305		pnfs_detach_layout_hdr(lo);
 
 306		spin_unlock(&inode->i_lock);
 307		pnfs_free_layout_hdr(lo);
 
 
 
 308	}
 309}
 310
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 311static void
 312pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
 313			 u32 seq)
 314{
 315	if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
 316		iomode = IOMODE_ANY;
 317	lo->plh_return_iomode = iomode;
 318	set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
 319	if (seq != 0) {
 320		WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
 
 
 
 
 
 321		lo->plh_return_seq = seq;
 322	}
 323}
 324
 325static void
 326pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
 327{
 328	struct pnfs_layout_segment *lseg;
 329	lo->plh_return_iomode = 0;
 330	lo->plh_return_seq = 0;
 331	clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
 332	list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
 333		if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
 334			continue;
 335		pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
 336	}
 337}
 338
 339static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
 340{
 341	clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
 342	clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
 343	smp_mb__after_atomic();
 344	wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
 345	rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
 346}
 347
 348static void
 349pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
 350		struct list_head *free_me)
 351{
 352	clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
 353	clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
 354	if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
 355		pnfs_lseg_dec_and_remove_zero(lseg, free_me);
 356	if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
 357		pnfs_lseg_dec_and_remove_zero(lseg, free_me);
 358}
 359
 360/*
 361 * Update the seqid of a layout stateid
 
 362 */
 363bool nfs4_refresh_layout_stateid(nfs4_stateid *dst, struct inode *inode)
 
 
 364{
 365	struct pnfs_layout_hdr *lo;
 
 
 
 
 
 366	bool ret = false;
 
 
 367
 368	spin_lock(&inode->i_lock);
 369	lo = NFS_I(inode)->layout;
 370	if (lo && nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
 371		dst->seqid = lo->plh_stateid.seqid;
 372		ret = true;
 
 
 
 
 
 
 
 
 
 
 
 
 373	}
 
 374	spin_unlock(&inode->i_lock);
 
 375	return ret;
 376}
 377
 378/*
 379 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
 380 *
 381 * In order to continue using the pnfs_layout_hdr, a full recovery
 382 * is required.
 383 * Note that caller must hold inode->i_lock.
 384 */
 385int
 386pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
 387		struct list_head *lseg_list)
 388{
 389	struct pnfs_layout_range range = {
 390		.iomode = IOMODE_ANY,
 391		.offset = 0,
 392		.length = NFS4_MAX_UINT64,
 393	};
 394	struct pnfs_layout_segment *lseg, *next;
 395
 396	set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
 397	list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
 398		pnfs_clear_lseg_state(lseg, lseg_list);
 399	pnfs_clear_layoutreturn_info(lo);
 400	pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
 401	if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
 402	    !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
 403		pnfs_clear_layoutreturn_waitbit(lo);
 404	return !list_empty(&lo->plh_segs);
 405}
 406
 407static int
 408pnfs_iomode_to_fail_bit(u32 iomode)
 409{
 410	return iomode == IOMODE_RW ?
 411		NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
 412}
 413
 414static void
 415pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
 416{
 417	lo->plh_retry_timestamp = jiffies;
 418	if (!test_and_set_bit(fail_bit, &lo->plh_flags))
 419		refcount_inc(&lo->plh_refcount);
 420}
 421
 422static void
 423pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
 424{
 425	if (test_and_clear_bit(fail_bit, &lo->plh_flags))
 426		refcount_dec(&lo->plh_refcount);
 427}
 428
 429static void
 430pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
 431{
 432	struct inode *inode = lo->plh_inode;
 433	struct pnfs_layout_range range = {
 434		.iomode = iomode,
 435		.offset = 0,
 436		.length = NFS4_MAX_UINT64,
 437	};
 438	LIST_HEAD(head);
 439
 440	spin_lock(&inode->i_lock);
 441	pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
 442	pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
 443	spin_unlock(&inode->i_lock);
 444	pnfs_free_lseg_list(&head);
 445	dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
 446			iomode == IOMODE_RW ?  "RW" : "READ");
 447}
 448
 449static bool
 450pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
 451{
 452	unsigned long start, end;
 453	int fail_bit = pnfs_iomode_to_fail_bit(iomode);
 454
 455	if (test_bit(fail_bit, &lo->plh_flags) == 0)
 456		return false;
 457	end = jiffies;
 458	start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
 459	if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
 460		/* It is time to retry the failed layoutgets */
 461		pnfs_layout_clear_fail_bit(lo, fail_bit);
 462		return false;
 463	}
 464	return true;
 465}
 466
 467static void
 468pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
 469		const struct pnfs_layout_range *range,
 470		const nfs4_stateid *stateid)
 471{
 472	INIT_LIST_HEAD(&lseg->pls_list);
 473	INIT_LIST_HEAD(&lseg->pls_lc_list);
 
 474	refcount_set(&lseg->pls_refcount, 1);
 475	set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
 476	lseg->pls_layout = lo;
 477	lseg->pls_range = *range;
 478	lseg->pls_seq = be32_to_cpu(stateid->seqid);
 479}
 480
 481static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
 482{
 483	if (lseg != NULL) {
 484		struct inode *inode = lseg->pls_layout->plh_inode;
 485		NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
 486	}
 487}
 488
 489static void
 490pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
 491		struct pnfs_layout_segment *lseg)
 492{
 493	WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
 494	list_del_init(&lseg->pls_list);
 495	/* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
 496	refcount_dec(&lo->plh_refcount);
 497	if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
 498		return;
 499	if (list_empty(&lo->plh_segs) &&
 500	    !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
 501	    !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
 502		if (atomic_read(&lo->plh_outstanding) == 0)
 503			set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
 504		clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
 505	}
 506}
 507
 508static bool
 509pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
 510		struct pnfs_layout_segment *lseg)
 511{
 512	if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
 513	    pnfs_layout_is_valid(lo)) {
 514		pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
 515		list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
 516		return true;
 517	}
 518	return false;
 519}
 520
 521void
 522pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 523{
 524	struct pnfs_layout_hdr *lo;
 525	struct inode *inode;
 526
 527	if (!lseg)
 528		return;
 529
 530	dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
 531		refcount_read(&lseg->pls_refcount),
 532		test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
 533
 534	lo = lseg->pls_layout;
 535	inode = lo->plh_inode;
 536
 537	if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
 538		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
 539			spin_unlock(&inode->i_lock);
 540			return;
 541		}
 542		pnfs_get_layout_hdr(lo);
 543		pnfs_layout_remove_lseg(lo, lseg);
 544		if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
 545			lseg = NULL;
 546		spin_unlock(&inode->i_lock);
 547		pnfs_free_lseg(lseg);
 548		pnfs_put_layout_hdr(lo);
 549	}
 550}
 551EXPORT_SYMBOL_GPL(pnfs_put_lseg);
 552
 553/*
 554 * is l2 fully contained in l1?
 555 *   start1                             end1
 556 *   [----------------------------------)
 557 *           start2           end2
 558 *           [----------------)
 559 */
 560static bool
 561pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
 562		 const struct pnfs_layout_range *l2)
 563{
 564	u64 start1 = l1->offset;
 565	u64 end1 = pnfs_end_offset(start1, l1->length);
 566	u64 start2 = l2->offset;
 567	u64 end2 = pnfs_end_offset(start2, l2->length);
 568
 569	return (start1 <= start2) && (end1 >= end2);
 570}
 571
 572static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
 573		struct list_head *tmp_list)
 574{
 575	if (!refcount_dec_and_test(&lseg->pls_refcount))
 576		return false;
 577	pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
 578	list_add(&lseg->pls_list, tmp_list);
 579	return true;
 580}
 581
 582/* Returns 1 if lseg is removed from list, 0 otherwise */
 583static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
 584			     struct list_head *tmp_list)
 585{
 586	int rv = 0;
 587
 588	if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
 589		/* Remove the reference keeping the lseg in the
 590		 * list.  It will now be removed when all
 591		 * outstanding io is finished.
 592		 */
 593		dprintk("%s: lseg %p ref %d\n", __func__, lseg,
 594			refcount_read(&lseg->pls_refcount));
 595		if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
 596			rv = 1;
 597	}
 598	return rv;
 599}
 600
 601/*
 602 * Compare 2 layout stateid sequence ids, to see which is newer,
 603 * taking into account wraparound issues.
 604 */
 605static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
 606{
 607	return (s32)(s1 - s2) > 0;
 608}
 609
 610static bool
 611pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
 612		 const struct pnfs_layout_range *recall_range)
 613{
 614	return (recall_range->iomode == IOMODE_ANY ||
 615		lseg_range->iomode == recall_range->iomode) &&
 616	       pnfs_lseg_range_intersecting(lseg_range, recall_range);
 617}
 618
 619static bool
 620pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
 621		const struct pnfs_layout_range *recall_range,
 622		u32 seq)
 623{
 624	if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
 625		return false;
 626	if (recall_range == NULL)
 627		return true;
 628	return pnfs_should_free_range(&lseg->pls_range, recall_range);
 629}
 630
 631/**
 632 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
 633 * @lo: layout header containing the lsegs
 634 * @tmp_list: list head where doomed lsegs should go
 635 * @recall_range: optional recall range argument to match (may be NULL)
 636 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
 637 *
 638 * Walk the list of lsegs in the layout header, and tear down any that should
 639 * be destroyed. If "recall_range" is specified then the segment must match
 640 * that range. If "seq" is non-zero, then only match segments that were handed
 641 * out at or before that sequence.
 642 *
 643 * Returns number of matching invalid lsegs remaining in list after scanning
 644 * it and purging them.
 645 */
 646int
 647pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 648			    struct list_head *tmp_list,
 649			    const struct pnfs_layout_range *recall_range,
 650			    u32 seq)
 651{
 652	struct pnfs_layout_segment *lseg, *next;
 653	int remaining = 0;
 654
 655	dprintk("%s:Begin lo %p\n", __func__, lo);
 656
 657	if (list_empty(&lo->plh_segs))
 658		return 0;
 659	list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
 660		if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
 661			dprintk("%s: freeing lseg %p iomode %d seq %u "
 662				"offset %llu length %llu\n", __func__,
 663				lseg, lseg->pls_range.iomode, lseg->pls_seq,
 664				lseg->pls_range.offset, lseg->pls_range.length);
 665			if (!mark_lseg_invalid(lseg, tmp_list))
 666				remaining++;
 667		}
 668	dprintk("%s:Return %i\n", __func__, remaining);
 669	return remaining;
 670}
 671
 672static void
 673pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
 674		struct list_head *free_me,
 675		const struct pnfs_layout_range *range,
 676		u32 seq)
 677{
 678	struct pnfs_layout_segment *lseg, *next;
 679
 680	list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
 681		if (pnfs_match_lseg_recall(lseg, range, seq))
 682			list_move_tail(&lseg->pls_list, free_me);
 683	}
 684}
 685
 686/* note free_me must contain lsegs from a single layout_hdr */
 687void
 688pnfs_free_lseg_list(struct list_head *free_me)
 689{
 690	struct pnfs_layout_segment *lseg, *tmp;
 691
 692	if (list_empty(free_me))
 693		return;
 694
 695	list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
 696		list_del(&lseg->pls_list);
 697		pnfs_free_lseg(lseg);
 698	}
 699}
 700
 701void
 702pnfs_destroy_layout(struct nfs_inode *nfsi)
 703{
 704	struct pnfs_layout_hdr *lo;
 705	LIST_HEAD(tmp_list);
 706
 707	spin_lock(&nfsi->vfs_inode.i_lock);
 708	lo = nfsi->layout;
 709	if (lo) {
 710		pnfs_get_layout_hdr(lo);
 711		pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
 712		pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
 713		pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
 714		spin_unlock(&nfsi->vfs_inode.i_lock);
 715		pnfs_free_lseg_list(&tmp_list);
 716		nfs_commit_inode(&nfsi->vfs_inode, 0);
 717		pnfs_put_layout_hdr(lo);
 718	} else
 719		spin_unlock(&nfsi->vfs_inode.i_lock);
 
 
 
 
 
 
 720}
 721EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
 722
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 723static bool
 724pnfs_layout_add_bulk_destroy_list(struct inode *inode,
 725		struct list_head *layout_list)
 726{
 727	struct pnfs_layout_hdr *lo;
 728	bool ret = false;
 729
 730	spin_lock(&inode->i_lock);
 731	lo = NFS_I(inode)->layout;
 732	if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
 733		pnfs_get_layout_hdr(lo);
 734		list_add(&lo->plh_bulk_destroy, layout_list);
 735		ret = true;
 736	}
 737	spin_unlock(&inode->i_lock);
 738	return ret;
 739}
 740
 741/* Caller must hold rcu_read_lock and clp->cl_lock */
 742static int
 743pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
 744		struct nfs_server *server,
 745		struct list_head *layout_list)
 
 
 746{
 747	struct pnfs_layout_hdr *lo, *next;
 748	struct inode *inode;
 749
 750	list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
 751		if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
 752			continue;
 753		inode = igrab(lo->plh_inode);
 754		if (inode == NULL)
 755			continue;
 756		list_del_init(&lo->plh_layouts);
 757		if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
 758			continue;
 759		rcu_read_unlock();
 760		spin_unlock(&clp->cl_lock);
 761		iput(inode);
 
 
 
 
 
 
 
 
 
 
 
 
 762		spin_lock(&clp->cl_lock);
 763		rcu_read_lock();
 764		return -EAGAIN;
 765	}
 766	return 0;
 767}
 768
 769static int
 770pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
 771		bool is_bulk_recall)
 772{
 773	struct pnfs_layout_hdr *lo;
 774	struct inode *inode;
 775	LIST_HEAD(lseg_list);
 776	int ret = 0;
 777
 778	while (!list_empty(layout_list)) {
 779		lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
 780				plh_bulk_destroy);
 781		dprintk("%s freeing layout for inode %lu\n", __func__,
 782			lo->plh_inode->i_ino);
 783		inode = lo->plh_inode;
 784
 785		pnfs_layoutcommit_inode(inode, false);
 786
 787		spin_lock(&inode->i_lock);
 788		list_del_init(&lo->plh_bulk_destroy);
 789		if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
 790			if (is_bulk_recall)
 791				set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
 792			ret = -EAGAIN;
 793		}
 794		spin_unlock(&inode->i_lock);
 795		pnfs_free_lseg_list(&lseg_list);
 796		/* Free all lsegs that are attached to commit buckets */
 797		nfs_commit_inode(inode, 0);
 798		pnfs_put_layout_hdr(lo);
 799		iput(inode);
 800	}
 801	return ret;
 802}
 803
 804int
 805pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 806		struct nfs_fsid *fsid,
 807		bool is_recall)
 808{
 809	struct nfs_server *server;
 810	LIST_HEAD(layout_list);
 811
 812	spin_lock(&clp->cl_lock);
 813	rcu_read_lock();
 814restart:
 815	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 816		if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
 817			continue;
 818		if (pnfs_layout_bulk_destroy_byserver_locked(clp,
 819				server,
 820				&layout_list) != 0)
 821			goto restart;
 822	}
 823	rcu_read_unlock();
 824	spin_unlock(&clp->cl_lock);
 825
 826	if (list_empty(&layout_list))
 827		return 0;
 828	return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
 829}
 830
 831int
 832pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 833		bool is_recall)
 834{
 835	struct nfs_server *server;
 836	LIST_HEAD(layout_list);
 837
 838	spin_lock(&clp->cl_lock);
 839	rcu_read_lock();
 840restart:
 841	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 842		if (pnfs_layout_bulk_destroy_byserver_locked(clp,
 843					server,
 844					&layout_list) != 0)
 845			goto restart;
 846	}
 847	rcu_read_unlock();
 848	spin_unlock(&clp->cl_lock);
 849
 850	if (list_empty(&layout_list))
 851		return 0;
 852	return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
 853}
 854
 855/*
 856 * Called by the state manger to remove all layouts established under an
 857 * expired lease.
 858 */
 859void
 860pnfs_destroy_all_layouts(struct nfs_client *clp)
 861{
 862	nfs4_deviceid_mark_client_invalid(clp);
 863	nfs4_deviceid_purge_client(clp);
 864
 865	pnfs_destroy_layouts_byclid(clp, false);
 866}
 867
 
 
 
 
 
 
 
 
 
 
 
 868/* update lo->plh_stateid with new if is more recent */
 869void
 870pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
 871			bool update_barrier)
 872{
 873	u32 oldseq, newseq, new_barrier = 0;
 874
 875	oldseq = be32_to_cpu(lo->plh_stateid.seqid);
 876	newseq = be32_to_cpu(new->seqid);
 877
 878	if (!pnfs_layout_is_valid(lo)) {
 
 879		nfs4_stateid_copy(&lo->plh_stateid, new);
 880		lo->plh_barrier = newseq;
 881		pnfs_clear_layoutreturn_info(lo);
 882		clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
 883		return;
 884	}
 885	if (pnfs_seqid_is_newer(newseq, oldseq)) {
 
 886		nfs4_stateid_copy(&lo->plh_stateid, new);
 887		/*
 888		 * Because of wraparound, we want to keep the barrier
 889		 * "close" to the current seqids.
 890		 */
 891		new_barrier = newseq - atomic_read(&lo->plh_outstanding);
 892	}
 893	if (update_barrier)
 894		new_barrier = be32_to_cpu(new->seqid);
 895	else if (new_barrier == 0)
 896		return;
 897	if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
 898		lo->plh_barrier = new_barrier;
 
 
 
 
 
 
 899}
 900
 901static bool
 902pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
 903		const nfs4_stateid *stateid)
 904{
 905	u32 seqid = be32_to_cpu(stateid->seqid);
 906
 907	return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
 908}
 909
 910/* lget is set to 1 if called from inside send_layoutget call chain */
 911static bool
 912pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
 913{
 914	return lo->plh_block_lgets ||
 915		test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
 916}
 917
 918/*
 919 * Get layout from server.
 920 *    for now, assume that whole file layouts are requested.
 921 *    arg->offset: 0
 922 *    arg->length: all ones
 923 */
 924static struct pnfs_layout_segment *
 925send_layoutget(struct pnfs_layout_hdr *lo,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 926	   struct nfs_open_context *ctx,
 927	   nfs4_stateid *stateid,
 928	   const struct pnfs_layout_range *range,
 929	   long *timeout, gfp_t gfp_flags)
 930{
 931	struct inode *ino = lo->plh_inode;
 932	struct nfs_server *server = NFS_SERVER(ino);
 
 933	struct nfs4_layoutget *lgp;
 934	loff_t i_size;
 935
 936	dprintk("--> %s\n", __func__);
 937
 938	/*
 939	 * Synchronously retrieve layout information from server and
 940	 * store in lseg. If we race with a concurrent seqid morphing
 941	 * op, then re-send the LAYOUTGET.
 942	 */
 943	lgp = kzalloc(sizeof(*lgp), gfp_flags);
 944	if (lgp == NULL)
 945		return ERR_PTR(-ENOMEM);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 946
 947	i_size = i_size_read(ino);
 
 948
 949	lgp->args.minlength = PAGE_SIZE;
 950	if (lgp->args.minlength > range->length)
 951		lgp->args.minlength = range->length;
 952	if (range->iomode == IOMODE_READ) {
 953		if (range->offset >= i_size)
 954			lgp->args.minlength = 0;
 955		else if (i_size - range->offset < lgp->args.minlength)
 956			lgp->args.minlength = i_size - range->offset;
 
 
 
 
 957	}
 958	lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
 959	pnfs_copy_range(&lgp->args.range, range);
 960	lgp->args.type = server->pnfs_curr_ld->id;
 961	lgp->args.inode = ino;
 962	lgp->args.ctx = get_nfs_open_context(ctx);
 963	nfs4_stateid_copy(&lgp->args.stateid, stateid);
 964	lgp->gfp_flags = gfp_flags;
 965	lgp->cred = lo->plh_lc_cred;
 
 
 
 
 
 
 966
 967	return nfs4_proc_layoutget(lgp, timeout, gfp_flags);
 
 
 
 968}
 969
 970static void pnfs_clear_layoutcommit(struct inode *inode,
 971		struct list_head *head)
 972{
 973	struct nfs_inode *nfsi = NFS_I(inode);
 974	struct pnfs_layout_segment *lseg, *tmp;
 975
 976	if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
 977		return;
 978	list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
 979		if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
 980			continue;
 981		pnfs_lseg_dec_and_remove_zero(lseg, head);
 982	}
 983}
 984
 985void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
 986		const nfs4_stateid *arg_stateid,
 987		const struct pnfs_layout_range *range,
 988		const nfs4_stateid *stateid)
 989{
 990	struct inode *inode = lo->plh_inode;
 991	LIST_HEAD(freeme);
 992
 993	spin_lock(&inode->i_lock);
 994	if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
 995	    !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
 996		goto out_unlock;
 997	if (stateid) {
 998		u32 seq = be32_to_cpu(arg_stateid->seqid);
 999
1000		pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1001		pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1002		pnfs_set_layout_stateid(lo, stateid, true);
1003	} else
1004		pnfs_mark_layout_stateid_invalid(lo, &freeme);
1005out_unlock:
1006	pnfs_clear_layoutreturn_waitbit(lo);
1007	spin_unlock(&inode->i_lock);
1008	pnfs_free_lseg_list(&freeme);
1009
1010}
1011
1012static bool
1013pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1014		nfs4_stateid *stateid,
 
1015		enum pnfs_iomode *iomode)
1016{
1017	/* Serialise LAYOUTGET/LAYOUTRETURN */
1018	if (atomic_read(&lo->plh_outstanding) != 0)
1019		return false;
1020	if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1021		return false;
1022	set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1023	pnfs_get_layout_hdr(lo);
 
 
1024	if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1025		if (stateid != NULL) {
1026			nfs4_stateid_copy(stateid, &lo->plh_stateid);
1027			if (lo->plh_return_seq != 0)
1028				stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1029		}
1030		if (iomode != NULL)
1031			*iomode = lo->plh_return_iomode;
1032		pnfs_clear_layoutreturn_info(lo);
1033		return true;
1034	}
1035	if (stateid != NULL)
1036		nfs4_stateid_copy(stateid, &lo->plh_stateid);
1037	if (iomode != NULL)
1038		*iomode = IOMODE_ANY;
 
1039	return true;
1040}
1041
1042static void
1043pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1044		struct pnfs_layout_hdr *lo,
1045		const nfs4_stateid *stateid,
1046		enum pnfs_iomode iomode)
1047{
1048	struct inode *inode = lo->plh_inode;
1049
1050	args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1051	args->inode = inode;
1052	args->range.iomode = iomode;
1053	args->range.offset = 0;
1054	args->range.length = NFS4_MAX_UINT64;
1055	args->layout = lo;
1056	nfs4_stateid_copy(&args->stateid, stateid);
1057}
1058
1059static int
1060pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
1061		       enum pnfs_iomode iomode, bool sync)
 
 
 
1062{
1063	struct inode *ino = lo->plh_inode;
1064	struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1065	struct nfs4_layoutreturn *lrp;
 
1066	int status = 0;
1067
 
1068	lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1069	if (unlikely(lrp == NULL)) {
1070		status = -ENOMEM;
1071		spin_lock(&ino->i_lock);
1072		pnfs_clear_layoutreturn_waitbit(lo);
1073		spin_unlock(&ino->i_lock);
 
1074		pnfs_put_layout_hdr(lo);
1075		goto out;
1076	}
1077
1078	pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1079	lrp->args.ld_private = &lrp->ld_private;
1080	lrp->clp = NFS_SERVER(ino)->nfs_client;
1081	lrp->cred = lo->plh_lc_cred;
1082	if (ld->prepare_layoutreturn)
1083		ld->prepare_layoutreturn(&lrp->args);
1084
1085	status = nfs4_proc_layoutreturn(lrp, sync);
1086out:
1087	dprintk("<-- %s status: %d\n", __func__, status);
1088	return status;
1089}
1090
 
 
 
 
 
 
 
 
 
 
 
 
 
1091/* Return true if layoutreturn is needed */
1092static bool
1093pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1094{
1095	struct pnfs_layout_segment *s;
1096
1097	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1098		return false;
1099
1100	/* Defer layoutreturn until all lsegs are done */
1101	list_for_each_entry(s, &lo->plh_segs, pls_list) {
1102		if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
1103			return false;
1104	}
1105
1106	return true;
1107}
1108
1109static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1110{
1111	struct inode *inode= lo->plh_inode;
1112
1113	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1114		return;
1115	spin_lock(&inode->i_lock);
1116	if (pnfs_layout_need_return(lo)) {
 
1117		nfs4_stateid stateid;
1118		enum pnfs_iomode iomode;
1119		bool send;
1120
1121		send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1122		spin_unlock(&inode->i_lock);
1123		if (send) {
1124			/* Send an async layoutreturn so we dont deadlock */
1125			pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1126		}
1127	} else
1128		spin_unlock(&inode->i_lock);
1129}
1130
1131/*
1132 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1133 * when the layout segment list is empty.
1134 *
1135 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1136 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1137 * deviceid is marked invalid.
1138 */
1139int
1140_pnfs_return_layout(struct inode *ino)
1141{
1142	struct pnfs_layout_hdr *lo = NULL;
1143	struct nfs_inode *nfsi = NFS_I(ino);
 
 
 
 
 
1144	LIST_HEAD(tmp_list);
 
1145	nfs4_stateid stateid;
1146	int status = 0;
1147	bool send;
1148
1149	dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1150
1151	spin_lock(&ino->i_lock);
1152	lo = nfsi->layout;
1153	if (!lo) {
1154		spin_unlock(&ino->i_lock);
1155		dprintk("NFS: %s no layout to return\n", __func__);
1156		goto out;
1157	}
1158	/* Reference matched in nfs4_layoutreturn_release */
1159	pnfs_get_layout_hdr(lo);
1160	/* Is there an outstanding layoutreturn ? */
1161	if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1162		spin_unlock(&ino->i_lock);
1163		if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1164					TASK_UNINTERRUPTIBLE))
1165			goto out_put_layout_hdr;
1166		spin_lock(&ino->i_lock);
1167	}
 
1168	pnfs_clear_layoutcommit(ino, &tmp_list);
1169	pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
1170
1171	if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1172		struct pnfs_layout_range range = {
1173			.iomode		= IOMODE_ANY,
1174			.offset		= 0,
1175			.length		= NFS4_MAX_UINT64,
1176		};
1177		NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1178	}
1179
1180	/* Don't send a LAYOUTRETURN if list was initially empty */
1181	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
 
1182		spin_unlock(&ino->i_lock);
1183		dprintk("NFS: %s no layout segments to return\n", __func__);
1184		goto out_put_layout_hdr;
1185	}
1186
1187	send = pnfs_prepare_layoutreturn(lo, &stateid, NULL);
1188	spin_unlock(&ino->i_lock);
1189	if (send)
1190		status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
 
 
1191out_put_layout_hdr:
1192	pnfs_free_lseg_list(&tmp_list);
1193	pnfs_put_layout_hdr(lo);
1194out:
1195	dprintk("<-- %s status: %d\n", __func__, status);
1196	return status;
1197}
1198
1199int
1200pnfs_commit_and_return_layout(struct inode *inode)
1201{
1202	struct pnfs_layout_hdr *lo;
1203	int ret;
1204
1205	spin_lock(&inode->i_lock);
1206	lo = NFS_I(inode)->layout;
1207	if (lo == NULL) {
1208		spin_unlock(&inode->i_lock);
1209		return 0;
1210	}
1211	pnfs_get_layout_hdr(lo);
1212	/* Block new layoutgets and read/write to ds */
1213	lo->plh_block_lgets++;
1214	spin_unlock(&inode->i_lock);
1215	filemap_fdatawait(inode->i_mapping);
1216	ret = pnfs_layoutcommit_inode(inode, true);
1217	if (ret == 0)
1218		ret = _pnfs_return_layout(inode);
1219	spin_lock(&inode->i_lock);
1220	lo->plh_block_lgets--;
1221	spin_unlock(&inode->i_lock);
1222	pnfs_put_layout_hdr(lo);
1223	return ret;
1224}
1225
1226bool pnfs_roc(struct inode *ino,
1227		struct nfs4_layoutreturn_args *args,
1228		struct nfs4_layoutreturn_res *res,
1229		const struct rpc_cred *cred)
1230{
1231	struct nfs_inode *nfsi = NFS_I(ino);
1232	struct nfs_open_context *ctx;
1233	struct nfs4_state *state;
1234	struct pnfs_layout_hdr *lo;
1235	struct pnfs_layout_segment *lseg, *next;
 
1236	nfs4_stateid stateid;
1237	enum pnfs_iomode iomode = 0;
1238	bool layoutreturn = false, roc = false;
1239	bool skip_read = false;
1240
1241	if (!nfs_have_layout(ino))
1242		return false;
1243retry:
 
1244	spin_lock(&ino->i_lock);
1245	lo = nfsi->layout;
1246	if (!lo || !pnfs_layout_is_valid(lo) ||
1247	    test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1248		lo = NULL;
1249		goto out_noroc;
1250	}
1251	pnfs_get_layout_hdr(lo);
1252	if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1253		spin_unlock(&ino->i_lock);
 
1254		wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1255				TASK_UNINTERRUPTIBLE);
1256		pnfs_put_layout_hdr(lo);
1257		goto retry;
1258	}
1259
1260	/* no roc if we hold a delegation */
1261	if (nfs4_check_delegation(ino, FMODE_READ)) {
1262		if (nfs4_check_delegation(ino, FMODE_WRITE))
1263			goto out_noroc;
1264		skip_read = true;
1265	}
1266
1267	list_for_each_entry(ctx, &nfsi->open_files, list) {
1268		state = ctx->state;
1269		if (state == NULL)
1270			continue;
1271		/* Don't return layout if there is open file state */
1272		if (state->state & FMODE_WRITE)
1273			goto out_noroc;
1274		if (state->state & FMODE_READ)
1275			skip_read = true;
1276	}
1277
1278
1279	list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1280		if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1281			continue;
1282		/* If we are sending layoutreturn, invalidate all valid lsegs */
1283		if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1284			continue;
1285		/*
1286		 * Note: mark lseg for return so pnfs_layout_remove_lseg
1287		 * doesn't invalidate the layout for us.
1288		 */
1289		set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1290		if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1291			continue;
1292		pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1293	}
1294
1295	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1296		goto out_noroc;
1297
1298	/* ROC in two conditions:
1299	 * 1. there are ROC lsegs
1300	 * 2. we don't send layoutreturn
1301	 */
1302	/* lo ref dropped in pnfs_roc_release() */
1303	layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1304	/* If the creds don't match, we can't compound the layoutreturn */
1305	if (!layoutreturn || cred != lo->plh_lc_cred)
1306		goto out_noroc;
1307
1308	roc = layoutreturn;
1309	pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1310	res->lrs_present = 0;
1311	layoutreturn = false;
 
1312
1313out_noroc:
1314	spin_unlock(&ino->i_lock);
 
1315	pnfs_layoutcommit_inode(ino, true);
1316	if (roc) {
1317		struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1318		if (ld->prepare_layoutreturn)
1319			ld->prepare_layoutreturn(args);
1320		pnfs_put_layout_hdr(lo);
1321		return true;
1322	}
1323	if (layoutreturn)
1324		pnfs_send_layoutreturn(lo, &stateid, iomode, true);
1325	pnfs_put_layout_hdr(lo);
1326	return false;
1327}
1328
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1329void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1330		struct nfs4_layoutreturn_res *res,
1331		int ret)
1332{
1333	struct pnfs_layout_hdr *lo = args->layout;
1334	const nfs4_stateid *arg_stateid = NULL;
1335	const nfs4_stateid *res_stateid = NULL;
1336	struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1337
1338	if (ret == 0) {
1339		arg_stateid = &args->stateid;
 
 
 
 
 
 
 
 
1340		if (res->lrs_present)
1341			res_stateid = &res->stateid;
 
 
 
 
1342	}
1343	pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1344			res_stateid);
1345	if (ld_private && ld_private->ops && ld_private->ops->free)
1346		ld_private->ops->free(ld_private);
1347	pnfs_put_layout_hdr(lo);
1348	trace_nfs4_layoutreturn_on_close(args->inode, 0);
1349}
1350
1351bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1352{
1353	struct nfs_inode *nfsi = NFS_I(ino);
1354        struct pnfs_layout_hdr *lo;
1355        bool sleep = false;
1356
1357	/* we might not have grabbed lo reference. so need to check under
1358	 * i_lock */
1359        spin_lock(&ino->i_lock);
1360        lo = nfsi->layout;
1361        if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1362                rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1363                sleep = true;
1364	}
1365        spin_unlock(&ino->i_lock);
1366        return sleep;
1367}
1368
1369/*
1370 * Compare two layout segments for sorting into layout cache.
1371 * We want to preferentially return RW over RO layouts, so ensure those
1372 * are seen first.
1373 */
1374static s64
1375pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1376	   const struct pnfs_layout_range *l2)
1377{
1378	s64 d;
1379
1380	/* high offset > low offset */
1381	d = l1->offset - l2->offset;
1382	if (d)
1383		return d;
1384
1385	/* short length > long length */
1386	d = l2->length - l1->length;
1387	if (d)
1388		return d;
1389
1390	/* read > read/write */
1391	return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1392}
1393
1394static bool
1395pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1396		const struct pnfs_layout_range *l2)
1397{
1398	return pnfs_lseg_range_cmp(l1, l2) > 0;
1399}
1400
1401static bool
1402pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1403		struct pnfs_layout_segment *old)
1404{
1405	return false;
1406}
1407
1408void
1409pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1410		   struct pnfs_layout_segment *lseg,
1411		   bool (*is_after)(const struct pnfs_layout_range *,
1412			   const struct pnfs_layout_range *),
1413		   bool (*do_merge)(struct pnfs_layout_segment *,
1414			   struct pnfs_layout_segment *),
1415		   struct list_head *free_me)
1416{
1417	struct pnfs_layout_segment *lp, *tmp;
1418
1419	dprintk("%s:Begin\n", __func__);
1420
1421	list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1422		if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1423			continue;
1424		if (do_merge(lseg, lp)) {
1425			mark_lseg_invalid(lp, free_me);
1426			continue;
1427		}
1428		if (is_after(&lseg->pls_range, &lp->pls_range))
1429			continue;
1430		list_add_tail(&lseg->pls_list, &lp->pls_list);
1431		dprintk("%s: inserted lseg %p "
1432			"iomode %d offset %llu length %llu before "
1433			"lp %p iomode %d offset %llu length %llu\n",
1434			__func__, lseg, lseg->pls_range.iomode,
1435			lseg->pls_range.offset, lseg->pls_range.length,
1436			lp, lp->pls_range.iomode, lp->pls_range.offset,
1437			lp->pls_range.length);
1438		goto out;
1439	}
1440	list_add_tail(&lseg->pls_list, &lo->plh_segs);
1441	dprintk("%s: inserted lseg %p "
1442		"iomode %d offset %llu length %llu at tail\n",
1443		__func__, lseg, lseg->pls_range.iomode,
1444		lseg->pls_range.offset, lseg->pls_range.length);
1445out:
1446	pnfs_get_layout_hdr(lo);
1447
1448	dprintk("%s:Return\n", __func__);
1449}
1450EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1451
1452static void
1453pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1454		   struct pnfs_layout_segment *lseg,
1455		   struct list_head *free_me)
1456{
1457	struct inode *inode = lo->plh_inode;
1458	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1459
1460	if (ld->add_lseg != NULL)
1461		ld->add_lseg(lo, lseg, free_me);
1462	else
1463		pnfs_generic_layout_insert_lseg(lo, lseg,
1464				pnfs_lseg_range_is_after,
1465				pnfs_lseg_no_merge,
1466				free_me);
1467}
1468
1469static struct pnfs_layout_hdr *
1470alloc_init_layout_hdr(struct inode *ino,
1471		      struct nfs_open_context *ctx,
1472		      gfp_t gfp_flags)
1473{
1474	struct pnfs_layout_hdr *lo;
1475
1476	lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1477	if (!lo)
1478		return NULL;
1479	refcount_set(&lo->plh_refcount, 1);
1480	INIT_LIST_HEAD(&lo->plh_layouts);
1481	INIT_LIST_HEAD(&lo->plh_segs);
1482	INIT_LIST_HEAD(&lo->plh_return_segs);
1483	INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1484	lo->plh_inode = ino;
1485	lo->plh_lc_cred = get_rpccred(ctx->cred);
1486	lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1487	return lo;
1488}
1489
1490static struct pnfs_layout_hdr *
1491pnfs_find_alloc_layout(struct inode *ino,
1492		       struct nfs_open_context *ctx,
1493		       gfp_t gfp_flags)
1494	__releases(&ino->i_lock)
1495	__acquires(&ino->i_lock)
1496{
1497	struct nfs_inode *nfsi = NFS_I(ino);
1498	struct pnfs_layout_hdr *new = NULL;
1499
1500	dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1501
1502	if (nfsi->layout != NULL)
1503		goto out_existing;
1504	spin_unlock(&ino->i_lock);
1505	new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1506	spin_lock(&ino->i_lock);
1507
1508	if (likely(nfsi->layout == NULL)) {	/* Won the race? */
1509		nfsi->layout = new;
1510		return new;
1511	} else if (new != NULL)
1512		pnfs_free_layout_hdr(new);
1513out_existing:
1514	pnfs_get_layout_hdr(nfsi->layout);
1515	return nfsi->layout;
1516}
1517
1518/*
1519 * iomode matching rules:
1520 * iomode	lseg	strict match
1521 *                      iomode
1522 * -----	-----	------ -----
1523 * ANY		READ	N/A    true
1524 * ANY		RW	N/A    true
1525 * RW		READ	N/A    false
1526 * RW		RW	N/A    true
1527 * READ		READ	N/A    true
1528 * READ		RW	true   false
1529 * READ		RW	false  true
1530 */
1531static bool
1532pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1533		 const struct pnfs_layout_range *range,
1534		 bool strict_iomode)
1535{
1536	struct pnfs_layout_range range1;
1537
1538	if ((range->iomode == IOMODE_RW &&
1539	     ls_range->iomode != IOMODE_RW) ||
1540	    (range->iomode != ls_range->iomode &&
1541	     strict_iomode) ||
1542	    !pnfs_lseg_range_intersecting(ls_range, range))
1543		return 0;
1544
1545	/* range1 covers only the first byte in the range */
1546	range1 = *range;
1547	range1.length = 1;
1548	return pnfs_lseg_range_contained(ls_range, &range1);
1549}
1550
1551/*
1552 * lookup range in layout
1553 */
1554static struct pnfs_layout_segment *
1555pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1556		struct pnfs_layout_range *range,
1557		bool strict_iomode)
1558{
1559	struct pnfs_layout_segment *lseg, *ret = NULL;
1560
1561	dprintk("%s:Begin\n", __func__);
1562
1563	list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1564		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1565		    !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1566		    pnfs_lseg_range_match(&lseg->pls_range, range,
1567					  strict_iomode)) {
1568			ret = pnfs_get_lseg(lseg);
1569			break;
1570		}
1571	}
1572
1573	dprintk("%s:Return lseg %p ref %d\n",
1574		__func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1575	return ret;
1576}
1577
1578/*
1579 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1580 * to the MDS or over pNFS
1581 *
1582 * The nfs_inode read_io and write_io fields are cumulative counters reset
1583 * when there are no layout segments. Note that in pnfs_update_layout iomode
1584 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1585 * WRITE request.
1586 *
1587 * A return of true means use MDS I/O.
1588 *
1589 * From rfc 5661:
1590 * If a file's size is smaller than the file size threshold, data accesses
1591 * SHOULD be sent to the metadata server.  If an I/O request has a length that
1592 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1593 * server.  If both file size and I/O size are provided, the client SHOULD
1594 * reach or exceed  both thresholds before sending its read or write
1595 * requests to the data server.
1596 */
1597static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1598				     struct inode *ino, int iomode)
1599{
1600	struct nfs4_threshold *t = ctx->mdsthreshold;
1601	struct nfs_inode *nfsi = NFS_I(ino);
1602	loff_t fsize = i_size_read(ino);
1603	bool size = false, size_set = false, io = false, io_set = false, ret = false;
1604
1605	if (t == NULL)
1606		return ret;
1607
1608	dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1609		__func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1610
1611	switch (iomode) {
1612	case IOMODE_READ:
1613		if (t->bm & THRESHOLD_RD) {
1614			dprintk("%s fsize %llu\n", __func__, fsize);
1615			size_set = true;
1616			if (fsize < t->rd_sz)
1617				size = true;
1618		}
1619		if (t->bm & THRESHOLD_RD_IO) {
1620			dprintk("%s nfsi->read_io %llu\n", __func__,
1621				nfsi->read_io);
1622			io_set = true;
1623			if (nfsi->read_io < t->rd_io_sz)
1624				io = true;
1625		}
1626		break;
1627	case IOMODE_RW:
1628		if (t->bm & THRESHOLD_WR) {
1629			dprintk("%s fsize %llu\n", __func__, fsize);
1630			size_set = true;
1631			if (fsize < t->wr_sz)
1632				size = true;
1633		}
1634		if (t->bm & THRESHOLD_WR_IO) {
1635			dprintk("%s nfsi->write_io %llu\n", __func__,
1636				nfsi->write_io);
1637			io_set = true;
1638			if (nfsi->write_io < t->wr_io_sz)
1639				io = true;
1640		}
1641		break;
1642	}
1643	if (size_set && io_set) {
1644		if (size && io)
1645			ret = true;
1646	} else if (size || io)
1647		ret = true;
1648
1649	dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1650	return ret;
1651}
1652
1653static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1654{
1655	/*
1656	 * send layoutcommit as it can hold up layoutreturn due to lseg
1657	 * reference
1658	 */
1659	pnfs_layoutcommit_inode(lo->plh_inode, false);
1660	return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1661				   nfs_wait_bit_killable,
1662				   TASK_UNINTERRUPTIBLE);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1663}
1664
1665static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1666{
1667	unsigned long *bitlock = &lo->plh_flags;
1668
1669	clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1670	smp_mb__after_atomic();
1671	wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1672}
1673
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1674/*
1675 * Layout segment is retreived from the server if not cached.
1676 * The appropriate layout segment is referenced and returned to the caller.
1677 */
1678struct pnfs_layout_segment *
1679pnfs_update_layout(struct inode *ino,
1680		   struct nfs_open_context *ctx,
1681		   loff_t pos,
1682		   u64 count,
1683		   enum pnfs_iomode iomode,
1684		   bool strict_iomode,
1685		   gfp_t gfp_flags)
1686{
1687	struct pnfs_layout_range arg = {
1688		.iomode = iomode,
1689		.offset = pos,
1690		.length = count,
1691	};
1692	unsigned pg_offset;
1693	struct nfs_server *server = NFS_SERVER(ino);
1694	struct nfs_client *clp = server->nfs_client;
1695	struct pnfs_layout_hdr *lo = NULL;
1696	struct pnfs_layout_segment *lseg = NULL;
 
1697	nfs4_stateid stateid;
1698	long timeout = 0;
1699	unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1700	bool first;
1701
1702	if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1703		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1704				 PNFS_UPDATE_LAYOUT_NO_PNFS);
1705		goto out;
1706	}
1707
1708	if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
1709		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1710				 PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
1711		goto out;
1712	}
1713
1714	if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1715		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1716				 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1717		goto out;
1718	}
1719
1720lookup_again:
1721	nfs4_client_recover_expired_lease(clp);
 
 
1722	first = false;
1723	spin_lock(&ino->i_lock);
1724	lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1725	if (lo == NULL) {
1726		spin_unlock(&ino->i_lock);
1727		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1728				 PNFS_UPDATE_LAYOUT_NOMEM);
1729		goto out;
1730	}
1731
1732	/* Do we even need to bother with this? */
1733	if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1734		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1735				 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1736		dprintk("%s matches recall, use MDS\n", __func__);
1737		goto out_unlock;
1738	}
1739
1740	/* if LAYOUTGET already failed once we don't try again */
1741	if (pnfs_layout_io_test_failed(lo, iomode)) {
1742		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1743				 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1744		goto out_unlock;
1745	}
1746
1747	lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
1748	if (lseg) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1749		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1750				PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1751		goto out_unlock;
1752	}
1753
1754	if (!nfs4_valid_open_stateid(ctx->state)) {
 
1755		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1756				PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1757		goto out_unlock;
1758	}
1759
1760	/*
1761	 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1762	 * stateid, or it has been invalidated, then we must use the open
1763	 * stateid.
1764	 */
1765	if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
 
1766
1767		/*
1768		 * The first layoutget for the file. Need to serialize per
1769		 * RFC 5661 Errata 3208.
1770		 */
1771		if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1772				     &lo->plh_flags)) {
1773			spin_unlock(&ino->i_lock);
1774			wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1775				    TASK_UNINTERRUPTIBLE);
 
 
 
1776			pnfs_put_layout_hdr(lo);
1777			dprintk("%s retrying\n", __func__);
1778			goto lookup_again;
1779		}
1780
 
1781		first = true;
1782		if (nfs4_select_rw_stateid(ctx->state,
1783					iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
1784					NULL, &stateid, NULL) != 0) {
 
 
1785			trace_pnfs_update_layout(ino, pos, count,
1786					iomode, lo, lseg,
1787					PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1788			goto out_unlock;
1789		}
1790	} else {
1791		nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1792	}
1793
1794	/*
1795	 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1796	 * for LAYOUTRETURN even if first is true.
1797	 */
1798	if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1799		spin_unlock(&ino->i_lock);
1800		dprintk("%s wait for layoutreturn\n", __func__);
1801		if (pnfs_prepare_to_retry_layoutget(lo)) {
1802			if (first)
1803				pnfs_clear_first_layoutget(lo);
1804			pnfs_put_layout_hdr(lo);
1805			dprintk("%s retrying\n", __func__);
1806			trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1807					lseg, PNFS_UPDATE_LAYOUT_RETRY);
1808			goto lookup_again;
1809		}
1810		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1811				PNFS_UPDATE_LAYOUT_RETURN);
1812		goto out_put_layout_hdr;
1813	}
1814
1815	if (pnfs_layoutgets_blocked(lo)) {
1816		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1817				PNFS_UPDATE_LAYOUT_BLOCKED);
1818		goto out_unlock;
1819	}
1820	atomic_inc(&lo->plh_outstanding);
1821	spin_unlock(&ino->i_lock);
1822
1823	if (list_empty(&lo->plh_layouts)) {
1824		/* The lo must be on the clp list if there is any
1825		 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1826		 */
1827		spin_lock(&clp->cl_lock);
1828		if (list_empty(&lo->plh_layouts))
1829			list_add_tail(&lo->plh_layouts, &server->layouts);
1830		spin_unlock(&clp->cl_lock);
1831	}
1832
1833	pg_offset = arg.offset & ~PAGE_MASK;
1834	if (pg_offset) {
1835		arg.offset -= pg_offset;
1836		arg.length += pg_offset;
1837	}
1838	if (arg.length != NFS4_MAX_UINT64)
1839		arg.length = PAGE_ALIGN(arg.length);
1840
1841	lseg = send_layoutget(lo, ctx, &stateid, &arg, &timeout, gfp_flags);
 
 
 
 
 
 
 
 
 
 
 
1842	trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1843				 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
1844	atomic_dec(&lo->plh_outstanding);
1845	if (IS_ERR(lseg)) {
1846		switch(PTR_ERR(lseg)) {
1847		case -EBUSY:
1848			if (time_after(jiffies, giveup))
1849				lseg = NULL;
1850			break;
1851		case -ERECALLCONFLICT:
1852			/* Huh? We hold no layouts, how is there a recall? */
1853			if (first) {
1854				lseg = NULL;
1855				break;
1856			}
1857			/* Destroy the existing layout and start over */
1858			if (time_after(jiffies, giveup))
1859				pnfs_destroy_layout(NFS_I(ino));
1860			/* Fallthrough */
1861		case -EAGAIN:
1862			break;
1863		default:
1864			if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
1865				pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1866				lseg = NULL;
1867			}
1868			goto out_put_layout_hdr;
1869		}
1870		if (lseg) {
1871			if (first)
1872				pnfs_clear_first_layoutget(lo);
1873			trace_pnfs_update_layout(ino, pos, count,
1874				iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
1875			pnfs_put_layout_hdr(lo);
1876			goto lookup_again;
1877		}
1878	} else {
1879		pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1880	}
1881
1882out_put_layout_hdr:
1883	if (first)
1884		pnfs_clear_first_layoutget(lo);
 
 
1885	pnfs_put_layout_hdr(lo);
1886out:
1887	dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1888			"(%s, offset: %llu, length: %llu)\n",
1889			__func__, ino->i_sb->s_id,
1890			(unsigned long long)NFS_FILEID(ino),
1891			IS_ERR_OR_NULL(lseg) ? "not found" : "found",
1892			iomode==IOMODE_RW ?  "read/write" : "read-only",
1893			(unsigned long long)pos,
1894			(unsigned long long)count);
1895	return lseg;
1896out_unlock:
1897	spin_unlock(&ino->i_lock);
1898	goto out_put_layout_hdr;
1899}
1900EXPORT_SYMBOL_GPL(pnfs_update_layout);
1901
1902static bool
1903pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
1904{
1905	switch (range->iomode) {
1906	case IOMODE_READ:
1907	case IOMODE_RW:
1908		break;
1909	default:
1910		return false;
1911	}
1912	if (range->offset == NFS4_MAX_UINT64)
1913		return false;
1914	if (range->length == 0)
1915		return false;
1916	if (range->length != NFS4_MAX_UINT64 &&
1917	    range->length > NFS4_MAX_UINT64 - range->offset)
1918		return false;
1919	return true;
1920}
1921
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1922struct pnfs_layout_segment *
1923pnfs_layout_process(struct nfs4_layoutget *lgp)
1924{
1925	struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1926	struct nfs4_layoutget_res *res = &lgp->res;
1927	struct pnfs_layout_segment *lseg;
1928	struct inode *ino = lo->plh_inode;
1929	LIST_HEAD(free_me);
1930
1931	if (!pnfs_sanity_check_layout_range(&res->range))
1932		return ERR_PTR(-EINVAL);
1933
1934	/* Inject layout blob into I/O device driver */
1935	lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1936	if (IS_ERR_OR_NULL(lseg)) {
1937		if (!lseg)
1938			lseg = ERR_PTR(-ENOMEM);
1939
1940		dprintk("%s: Could not allocate layout: error %ld\n",
1941		       __func__, PTR_ERR(lseg));
1942		return lseg;
1943	}
1944
1945	pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
1946
1947	spin_lock(&ino->i_lock);
1948	if (pnfs_layoutgets_blocked(lo)) {
1949		dprintk("%s forget reply due to state\n", __func__);
1950		goto out_forget;
1951	}
1952
1953	if (!pnfs_layout_is_valid(lo)) {
1954		/* We have a completely new layout */
1955		pnfs_set_layout_stateid(lo, &res->stateid, true);
1956	} else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
1957		/* existing state ID, make sure the sequence number matches. */
1958		if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
 
 
1959			dprintk("%s forget reply due to sequence\n", __func__);
1960			goto out_forget;
1961		}
1962		pnfs_set_layout_stateid(lo, &res->stateid, false);
1963	} else {
1964		/*
1965		 * We got an entirely new state ID.  Mark all segments for the
1966		 * inode invalid, and retry the layoutget
1967		 */
1968		pnfs_mark_layout_stateid_invalid(lo, &free_me);
 
 
 
 
1969		goto out_forget;
 
 
 
1970	}
1971
1972	pnfs_get_lseg(lseg);
1973	pnfs_layout_insert_lseg(lo, lseg, &free_me);
1974
1975
1976	if (res->return_on_close)
1977		set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1978
1979	spin_unlock(&ino->i_lock);
1980	pnfs_free_lseg_list(&free_me);
1981	return lseg;
1982
1983out_forget:
1984	spin_unlock(&ino->i_lock);
1985	lseg->pls_layout = lo;
1986	NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1987	if (!pnfs_layout_is_valid(lo))
1988		nfs_commit_inode(ino, 0);
1989	return ERR_PTR(-EAGAIN);
1990}
1991
1992/**
1993 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
1994 * @lo: pointer to layout header
1995 * @tmp_list: list header to be used with pnfs_free_lseg_list()
1996 * @return_range: describe layout segment ranges to be returned
 
1997 *
1998 * This function is mainly intended for use by layoutrecall. It attempts
1999 * to free the layout segment immediately, or else to mark it for return
2000 * as soon as its reference count drops to zero.
 
 
 
 
 
2001 */
2002int
2003pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2004				struct list_head *tmp_list,
2005				const struct pnfs_layout_range *return_range,
2006				u32 seq)
2007{
2008	struct pnfs_layout_segment *lseg, *next;
2009	int remaining = 0;
2010
2011	dprintk("%s:Begin lo %p\n", __func__, lo);
2012
2013	if (list_empty(&lo->plh_segs))
2014		return 0;
2015
2016	assert_spin_locked(&lo->plh_inode->i_lock);
2017
 
 
 
2018	list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2019		if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2020			dprintk("%s: marking lseg %p iomode %d "
2021				"offset %llu length %llu\n", __func__,
2022				lseg, lseg->pls_range.iomode,
2023				lseg->pls_range.offset,
2024				lseg->pls_range.length);
 
 
2025			if (mark_lseg_invalid(lseg, tmp_list))
2026				continue;
2027			remaining++;
2028			set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2029		}
2030
2031	if (remaining)
2032		pnfs_set_plh_return_info(lo, return_range->iomode, seq);
 
 
2033
2034	return remaining;
 
 
 
 
 
2035}
2036
2037void pnfs_error_mark_layout_for_return(struct inode *inode,
2038				       struct pnfs_layout_segment *lseg)
 
2039{
2040	struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2041	struct pnfs_layout_range range = {
2042		.iomode = lseg->pls_range.iomode,
2043		.offset = 0,
2044		.length = NFS4_MAX_UINT64,
2045	};
2046	bool return_now = false;
2047
2048	spin_lock(&inode->i_lock);
 
2049	if (!pnfs_layout_is_valid(lo)) {
2050		spin_unlock(&inode->i_lock);
2051		return;
2052	}
2053	pnfs_set_plh_return_info(lo, range.iomode, 0);
2054	/*
2055	 * mark all matching lsegs so that we are sure to have no live
2056	 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2057	 * for how it works.
2058	 */
2059	if (!pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0)) {
 
2060		nfs4_stateid stateid;
2061		enum pnfs_iomode iomode;
2062
2063		return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
2064		spin_unlock(&inode->i_lock);
2065		if (return_now)
2066			pnfs_send_layoutreturn(lo, &stateid, iomode, false);
2067	} else {
2068		spin_unlock(&inode->i_lock);
2069		nfs_commit_inode(inode, 0);
2070	}
2071}
 
 
 
 
 
 
 
 
 
 
 
 
2072EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2073
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2074void
2075pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2076{
2077	if (pgio->pg_lseg == NULL ||
2078	    test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2079		return;
2080	pnfs_put_lseg(pgio->pg_lseg);
2081	pgio->pg_lseg = NULL;
2082}
2083EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2084
2085/*
2086 * Check for any intersection between the request and the pgio->pg_lseg,
2087 * and if none, put this pgio->pg_lseg away.
2088 */
2089static void
2090pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2091{
2092	if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2093		pnfs_put_lseg(pgio->pg_lseg);
2094		pgio->pg_lseg = NULL;
2095	}
2096}
 
2097
2098void
2099pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2100{
2101	u64 rd_size = req->wb_bytes;
2102
2103	pnfs_generic_pg_check_layout(pgio);
2104	pnfs_generic_pg_check_range(pgio, req);
2105	if (pgio->pg_lseg == NULL) {
2106		if (pgio->pg_dreq == NULL)
2107			rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2108		else
2109			rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2110
2111		pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2112						   req->wb_context,
2113						   req_offset(req),
2114						   rd_size,
2115						   IOMODE_READ,
2116						   false,
2117						   GFP_KERNEL);
2118		if (IS_ERR(pgio->pg_lseg)) {
2119			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2120			pgio->pg_lseg = NULL;
2121			return;
2122		}
2123	}
2124	/* If no lseg, fall back to read through mds */
2125	if (pgio->pg_lseg == NULL)
2126		nfs_pageio_reset_read_mds(pgio);
2127
2128}
2129EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2130
2131void
2132pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2133			   struct nfs_page *req, u64 wb_size)
2134{
2135	pnfs_generic_pg_check_layout(pgio);
2136	pnfs_generic_pg_check_range(pgio, req);
2137	if (pgio->pg_lseg == NULL) {
2138		pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2139						   req->wb_context,
2140						   req_offset(req),
2141						   wb_size,
2142						   IOMODE_RW,
2143						   false,
2144						   GFP_NOFS);
2145		if (IS_ERR(pgio->pg_lseg)) {
2146			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2147			pgio->pg_lseg = NULL;
2148			return;
2149		}
2150	}
2151	/* If no lseg, fall back to write through mds */
2152	if (pgio->pg_lseg == NULL)
2153		nfs_pageio_reset_write_mds(pgio);
2154}
2155EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2156
2157void
2158pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2159{
2160	if (desc->pg_lseg) {
2161		pnfs_put_lseg(desc->pg_lseg);
2162		desc->pg_lseg = NULL;
2163	}
2164}
2165EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2166
2167/*
2168 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2169 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2170 */
2171size_t
2172pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2173		     struct nfs_page *prev, struct nfs_page *req)
2174{
2175	unsigned int size;
2176	u64 seg_end, req_start, seg_left;
2177
2178	size = nfs_generic_pg_test(pgio, prev, req);
2179	if (!size)
2180		return 0;
2181
2182	/*
2183	 * 'size' contains the number of bytes left in the current page (up
2184	 * to the original size asked for in @req->wb_bytes).
2185	 *
2186	 * Calculate how many bytes are left in the layout segment
2187	 * and if there are less bytes than 'size', return that instead.
2188	 *
2189	 * Please also note that 'end_offset' is actually the offset of the
2190	 * first byte that lies outside the pnfs_layout_range. FIXME?
2191	 *
2192	 */
2193	if (pgio->pg_lseg) {
2194		seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2195				     pgio->pg_lseg->pls_range.length);
2196		req_start = req_offset(req);
2197
2198		/* start of request is past the last byte of this segment */
2199		if (req_start >= seg_end)
2200			return 0;
2201
2202		/* adjust 'size' iff there are fewer bytes left in the
2203		 * segment than what nfs_generic_pg_test returned */
2204		seg_left = seg_end - req_start;
2205		if (seg_left < size)
2206			size = (unsigned int)seg_left;
2207	}
2208
2209	return size;
2210}
2211EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2212
2213int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2214{
2215	struct nfs_pageio_descriptor pgio;
2216
2217	/* Resend all requests through the MDS */
2218	nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2219			      hdr->completion_ops);
2220	set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2221	return nfs_pageio_resend(&pgio, hdr);
2222}
2223EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2224
2225static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2226{
2227
2228	dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2229	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2230	    PNFS_LAYOUTRET_ON_ERROR) {
2231		pnfs_return_layout(hdr->inode);
2232	}
2233	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2234		hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2235}
2236
2237/*
2238 * Called by non rpc-based layout drivers
2239 */
2240void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2241{
2242	if (likely(!hdr->pnfs_error)) {
2243		pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2244				hdr->mds_offset + hdr->res.count);
2245		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2246	}
2247	trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2248	if (unlikely(hdr->pnfs_error))
2249		pnfs_ld_handle_write_error(hdr);
2250	hdr->mds_ops->rpc_release(hdr);
2251}
2252EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2253
2254static void
2255pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2256		struct nfs_pgio_header *hdr)
2257{
2258	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2259
2260	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2261		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2262		nfs_pageio_reset_write_mds(desc);
2263		mirror->pg_recoalesce = 1;
2264	}
2265	hdr->completion_ops->completion(hdr);
2266}
2267
2268static enum pnfs_try_status
2269pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2270			const struct rpc_call_ops *call_ops,
2271			struct pnfs_layout_segment *lseg,
2272			int how)
2273{
2274	struct inode *inode = hdr->inode;
2275	enum pnfs_try_status trypnfs;
2276	struct nfs_server *nfss = NFS_SERVER(inode);
2277
2278	hdr->mds_ops = call_ops;
2279
2280	dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2281		inode->i_ino, hdr->args.count, hdr->args.offset, how);
2282	trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2283	if (trypnfs != PNFS_NOT_ATTEMPTED)
2284		nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2285	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2286	return trypnfs;
2287}
2288
2289static void
2290pnfs_do_write(struct nfs_pageio_descriptor *desc,
2291	      struct nfs_pgio_header *hdr, int how)
2292{
2293	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2294	struct pnfs_layout_segment *lseg = desc->pg_lseg;
2295	enum pnfs_try_status trypnfs;
2296
2297	trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2298	switch (trypnfs) {
2299	case PNFS_NOT_ATTEMPTED:
2300		pnfs_write_through_mds(desc, hdr);
 
2301	case PNFS_ATTEMPTED:
2302		break;
2303	case PNFS_TRY_AGAIN:
2304		/* cleanup hdr and prepare to redo pnfs */
2305		if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2306			struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2307			list_splice_init(&hdr->pages, &mirror->pg_list);
2308			mirror->pg_recoalesce = 1;
2309		}
2310		hdr->mds_ops->rpc_release(hdr);
2311	}
2312}
2313
2314static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2315{
2316	pnfs_put_lseg(hdr->lseg);
2317	nfs_pgio_header_free(hdr);
2318}
2319
2320int
2321pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2322{
2323	struct nfs_pgio_header *hdr;
2324	int ret;
2325
2326	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2327	if (!hdr) {
2328		desc->pg_error = -ENOMEM;
2329		return desc->pg_error;
2330	}
2331	nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2332
2333	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2334	ret = nfs_generic_pgio(desc, hdr);
2335	if (!ret)
2336		pnfs_do_write(desc, hdr, desc->pg_ioflags);
2337
2338	return ret;
2339}
2340EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2341
2342int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2343{
2344	struct nfs_pageio_descriptor pgio;
2345
2346	/* Resend all requests through the MDS */
2347	nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2348	return nfs_pageio_resend(&pgio, hdr);
2349}
2350EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2351
2352static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2353{
2354	dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2355	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2356	    PNFS_LAYOUTRET_ON_ERROR) {
2357		pnfs_return_layout(hdr->inode);
2358	}
2359	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2360		hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2361}
2362
2363/*
2364 * Called by non rpc-based layout drivers
2365 */
2366void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2367{
2368	if (likely(!hdr->pnfs_error))
2369		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2370	trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2371	if (unlikely(hdr->pnfs_error))
2372		pnfs_ld_handle_read_error(hdr);
2373	hdr->mds_ops->rpc_release(hdr);
2374}
2375EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2376
2377static void
2378pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2379		struct nfs_pgio_header *hdr)
2380{
2381	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2382
2383	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2384		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2385		nfs_pageio_reset_read_mds(desc);
2386		mirror->pg_recoalesce = 1;
2387	}
2388	hdr->completion_ops->completion(hdr);
2389}
2390
2391/*
2392 * Call the appropriate parallel I/O subsystem read function.
2393 */
2394static enum pnfs_try_status
2395pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2396		       const struct rpc_call_ops *call_ops,
2397		       struct pnfs_layout_segment *lseg)
2398{
2399	struct inode *inode = hdr->inode;
2400	struct nfs_server *nfss = NFS_SERVER(inode);
2401	enum pnfs_try_status trypnfs;
2402
2403	hdr->mds_ops = call_ops;
2404
2405	dprintk("%s: Reading ino:%lu %u@%llu\n",
2406		__func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2407
2408	trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2409	if (trypnfs != PNFS_NOT_ATTEMPTED)
2410		nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2411	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2412	return trypnfs;
2413}
2414
2415/* Resend all requests through pnfs. */
2416void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
 
2417{
2418	struct nfs_pageio_descriptor pgio;
2419
2420	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2421		/* Prevent deadlocks with layoutreturn! */
2422		pnfs_put_lseg(hdr->lseg);
2423		hdr->lseg = NULL;
2424
2425		nfs_pageio_init_read(&pgio, hdr->inode, false,
2426					hdr->completion_ops);
 
2427		hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2428	}
2429}
2430EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2431
2432static void
2433pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2434{
2435	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2436	struct pnfs_layout_segment *lseg = desc->pg_lseg;
2437	enum pnfs_try_status trypnfs;
2438
2439	trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2440	switch (trypnfs) {
2441	case PNFS_NOT_ATTEMPTED:
2442		pnfs_read_through_mds(desc, hdr);
 
2443	case PNFS_ATTEMPTED:
2444		break;
2445	case PNFS_TRY_AGAIN:
2446		/* cleanup hdr and prepare to redo pnfs */
2447		if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2448			struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2449			list_splice_init(&hdr->pages, &mirror->pg_list);
2450			mirror->pg_recoalesce = 1;
2451		}
2452		hdr->mds_ops->rpc_release(hdr);
2453	}
2454}
2455
2456static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2457{
2458	pnfs_put_lseg(hdr->lseg);
2459	nfs_pgio_header_free(hdr);
2460}
2461
2462int
2463pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2464{
2465	struct nfs_pgio_header *hdr;
2466	int ret;
2467
2468	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2469	if (!hdr) {
2470		desc->pg_error = -ENOMEM;
2471		return desc->pg_error;
2472	}
2473	nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2474	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2475	ret = nfs_generic_pgio(desc, hdr);
2476	if (!ret)
2477		pnfs_do_read(desc, hdr);
2478	return ret;
2479}
2480EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2481
2482static void pnfs_clear_layoutcommitting(struct inode *inode)
2483{
2484	unsigned long *bitlock = &NFS_I(inode)->flags;
2485
2486	clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2487	smp_mb__after_atomic();
2488	wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2489}
2490
2491/*
2492 * There can be multiple RW segments.
2493 */
2494static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2495{
2496	struct pnfs_layout_segment *lseg;
2497
2498	list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2499		if (lseg->pls_range.iomode == IOMODE_RW &&
2500		    test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2501			list_add(&lseg->pls_lc_list, listp);
2502	}
2503}
2504
2505static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2506{
2507	struct pnfs_layout_segment *lseg, *tmp;
2508
2509	/* Matched by references in pnfs_set_layoutcommit */
2510	list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2511		list_del_init(&lseg->pls_lc_list);
2512		pnfs_put_lseg(lseg);
2513	}
2514
2515	pnfs_clear_layoutcommitting(inode);
2516}
2517
2518void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2519{
2520	pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2521}
2522EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2523
2524void
2525pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2526		loff_t end_pos)
2527{
2528	struct nfs_inode *nfsi = NFS_I(inode);
2529	bool mark_as_dirty = false;
2530
2531	spin_lock(&inode->i_lock);
2532	if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2533		nfsi->layout->plh_lwb = end_pos;
2534		mark_as_dirty = true;
2535		dprintk("%s: Set layoutcommit for inode %lu ",
2536			__func__, inode->i_ino);
2537	} else if (end_pos > nfsi->layout->plh_lwb)
2538		nfsi->layout->plh_lwb = end_pos;
2539	if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2540		/* references matched in nfs4_layoutcommit_release */
2541		pnfs_get_lseg(lseg);
2542	}
2543	spin_unlock(&inode->i_lock);
2544	dprintk("%s: lseg %p end_pos %llu\n",
2545		__func__, lseg, nfsi->layout->plh_lwb);
2546
2547	/* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2548	 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2549	if (mark_as_dirty)
2550		mark_inode_dirty_sync(inode);
2551}
2552EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2553
2554void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2555{
2556	struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2557
2558	if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2559		nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2560	pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2561}
2562
2563/*
2564 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2565 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2566 * data to disk to allow the server to recover the data if it crashes.
2567 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2568 * is off, and a COMMIT is sent to a data server, or
2569 * if WRITEs to a data server return NFS_DATA_SYNC.
2570 */
2571int
2572pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2573{
2574	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2575	struct nfs4_layoutcommit_data *data;
2576	struct nfs_inode *nfsi = NFS_I(inode);
2577	loff_t end_pos;
2578	int status;
2579
2580	if (!pnfs_layoutcommit_outstanding(inode))
2581		return 0;
2582
2583	dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2584
2585	status = -EAGAIN;
2586	if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2587		if (!sync)
2588			goto out;
2589		status = wait_on_bit_lock_action(&nfsi->flags,
2590				NFS_INO_LAYOUTCOMMITTING,
2591				nfs_wait_bit_killable,
2592				TASK_KILLABLE);
2593		if (status)
2594			goto out;
2595	}
2596
2597	status = -ENOMEM;
2598	/* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2599	data = kzalloc(sizeof(*data), GFP_NOFS);
2600	if (!data)
2601		goto clear_layoutcommitting;
2602
2603	status = 0;
2604	spin_lock(&inode->i_lock);
2605	if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2606		goto out_unlock;
2607
2608	INIT_LIST_HEAD(&data->lseg_list);
2609	pnfs_list_write_lseg(inode, &data->lseg_list);
2610
2611	end_pos = nfsi->layout->plh_lwb;
2612
2613	nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
 
2614	spin_unlock(&inode->i_lock);
2615
2616	data->args.inode = inode;
2617	data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
2618	nfs_fattr_init(&data->fattr);
2619	data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2620	data->res.fattr = &data->fattr;
2621	if (end_pos != 0)
2622		data->args.lastbytewritten = end_pos - 1;
2623	else
2624		data->args.lastbytewritten = U64_MAX;
2625	data->res.server = NFS_SERVER(inode);
2626
2627	if (ld->prepare_layoutcommit) {
2628		status = ld->prepare_layoutcommit(&data->args);
2629		if (status) {
2630			put_rpccred(data->cred);
2631			spin_lock(&inode->i_lock);
2632			set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2633			if (end_pos > nfsi->layout->plh_lwb)
2634				nfsi->layout->plh_lwb = end_pos;
2635			goto out_unlock;
2636		}
2637	}
2638
2639
2640	status = nfs4_proc_layoutcommit(data, sync);
2641out:
2642	if (status)
2643		mark_inode_dirty_sync(inode);
2644	dprintk("<-- %s status %d\n", __func__, status);
2645	return status;
2646out_unlock:
2647	spin_unlock(&inode->i_lock);
2648	kfree(data);
2649clear_layoutcommitting:
2650	pnfs_clear_layoutcommitting(inode);
2651	goto out;
2652}
2653EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2654
2655int
2656pnfs_generic_sync(struct inode *inode, bool datasync)
2657{
2658	return pnfs_layoutcommit_inode(inode, true);
2659}
2660EXPORT_SYMBOL_GPL(pnfs_generic_sync);
2661
2662struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2663{
2664	struct nfs4_threshold *thp;
2665
2666	thp = kzalloc(sizeof(*thp), GFP_NOFS);
2667	if (!thp) {
2668		dprintk("%s mdsthreshold allocation failed\n", __func__);
2669		return NULL;
2670	}
2671	return thp;
2672}
2673
2674#if IS_ENABLED(CONFIG_NFS_V4_2)
2675int
2676pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2677{
2678	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2679	struct nfs_server *server = NFS_SERVER(inode);
2680	struct nfs_inode *nfsi = NFS_I(inode);
2681	struct nfs42_layoutstat_data *data;
2682	struct pnfs_layout_hdr *hdr;
2683	int status = 0;
2684
2685	if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
2686		goto out;
2687
2688	if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
2689		goto out;
2690
2691	if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
2692		goto out;
2693
2694	spin_lock(&inode->i_lock);
2695	if (!NFS_I(inode)->layout) {
2696		spin_unlock(&inode->i_lock);
2697		goto out_clear_layoutstats;
2698	}
2699	hdr = NFS_I(inode)->layout;
2700	pnfs_get_layout_hdr(hdr);
2701	spin_unlock(&inode->i_lock);
2702
2703	data = kzalloc(sizeof(*data), gfp_flags);
2704	if (!data) {
2705		status = -ENOMEM;
2706		goto out_put;
2707	}
2708
2709	data->args.fh = NFS_FH(inode);
2710	data->args.inode = inode;
2711	status = ld->prepare_layoutstats(&data->args);
2712	if (status)
2713		goto out_free;
2714
2715	status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
2716
2717out:
2718	dprintk("%s returns %d\n", __func__, status);
2719	return status;
2720
2721out_free:
2722	kfree(data);
2723out_put:
2724	pnfs_put_layout_hdr(hdr);
2725out_clear_layoutstats:
2726	smp_mb__before_atomic();
2727	clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
2728	smp_mb__after_atomic();
2729	goto out;
2730}
2731EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2732#endif
2733
2734unsigned int layoutstats_timer;
2735module_param(layoutstats_timer, uint, 0644);
2736EXPORT_SYMBOL_GPL(layoutstats_timer);
v5.14.15
   1/*
   2 *  pNFS functions to call and manage layout drivers.
   3 *
   4 *  Copyright (c) 2002 [year of first publication]
   5 *  The Regents of the University of Michigan
   6 *  All Rights Reserved
   7 *
   8 *  Dean Hildebrand <dhildebz@umich.edu>
   9 *
  10 *  Permission is granted to use, copy, create derivative works, and
  11 *  redistribute this software and such derivative works for any purpose,
  12 *  so long as the name of the University of Michigan is not used in
  13 *  any advertising or publicity pertaining to the use or distribution
  14 *  of this software without specific, written prior authorization. If
  15 *  the above copyright notice or any other identification of the
  16 *  University of Michigan is included in any copy of any portion of
  17 *  this software, then the disclaimer below must also be included.
  18 *
  19 *  This software is provided as is, without representation or warranty
  20 *  of any kind either express or implied, including without limitation
  21 *  the implied warranties of merchantability, fitness for a particular
  22 *  purpose, or noninfringement.  The Regents of the University of
  23 *  Michigan shall not be liable for any damages, including special,
  24 *  indirect, incidental, or consequential damages, with respect to any
  25 *  claim arising out of or in connection with the use of the software,
  26 *  even if it has been or is hereafter advised of the possibility of
  27 *  such damages.
  28 */
  29
  30#include <linux/nfs_fs.h>
  31#include <linux/nfs_page.h>
  32#include <linux/module.h>
  33#include <linux/sort.h>
  34#include "internal.h"
  35#include "pnfs.h"
  36#include "iostat.h"
  37#include "nfs4trace.h"
  38#include "delegation.h"
  39#include "nfs42.h"
  40#include "nfs4_fs.h"
  41
  42#define NFSDBG_FACILITY		NFSDBG_PNFS
  43#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
  44
  45/* Locking:
  46 *
  47 * pnfs_spinlock:
  48 *      protects pnfs_modules_tbl.
  49 */
  50static DEFINE_SPINLOCK(pnfs_spinlock);
  51
  52/*
  53 * pnfs_modules_tbl holds all pnfs modules
  54 */
  55static LIST_HEAD(pnfs_modules_tbl);
  56
  57static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
  58static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
  59		struct list_head *free_me,
  60		const struct pnfs_layout_range *range,
  61		u32 seq);
  62static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
  63		                struct list_head *tmp_list);
  64
  65/* Return the registered pnfs layout driver module matching given id */
  66static struct pnfs_layoutdriver_type *
  67find_pnfs_driver_locked(u32 id)
  68{
  69	struct pnfs_layoutdriver_type *local;
  70
  71	list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
  72		if (local->id == id)
  73			goto out;
  74	local = NULL;
  75out:
  76	dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
  77	return local;
  78}
  79
  80static struct pnfs_layoutdriver_type *
  81find_pnfs_driver(u32 id)
  82{
  83	struct pnfs_layoutdriver_type *local;
  84
  85	spin_lock(&pnfs_spinlock);
  86	local = find_pnfs_driver_locked(id);
  87	if (local != NULL && !try_module_get(local->owner)) {
  88		dprintk("%s: Could not grab reference on module\n", __func__);
  89		local = NULL;
  90	}
  91	spin_unlock(&pnfs_spinlock);
  92	return local;
  93}
  94
  95void
  96unset_pnfs_layoutdriver(struct nfs_server *nfss)
  97{
  98	if (nfss->pnfs_curr_ld) {
  99		if (nfss->pnfs_curr_ld->clear_layoutdriver)
 100			nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
 101		/* Decrement the MDS count. Purge the deviceid cache if zero */
 102		if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
 103			nfs4_deviceid_purge_client(nfss->nfs_client);
 104		module_put(nfss->pnfs_curr_ld->owner);
 105	}
 106	nfss->pnfs_curr_ld = NULL;
 107}
 108
 109/*
 110 * When the server sends a list of layout types, we choose one in the order
 111 * given in the list below.
 112 *
 113 * FIXME: should this list be configurable in some fashion? module param?
 114 * 	  mount option? something else?
 115 */
 116static const u32 ld_prefs[] = {
 117	LAYOUT_SCSI,
 118	LAYOUT_BLOCK_VOLUME,
 119	LAYOUT_OSD2_OBJECTS,
 120	LAYOUT_FLEX_FILES,
 121	LAYOUT_NFSV4_1_FILES,
 122	0
 123};
 124
 125static int
 126ld_cmp(const void *e1, const void *e2)
 127{
 128	u32 ld1 = *((u32 *)e1);
 129	u32 ld2 = *((u32 *)e2);
 130	int i;
 131
 132	for (i = 0; ld_prefs[i] != 0; i++) {
 133		if (ld1 == ld_prefs[i])
 134			return -1;
 135
 136		if (ld2 == ld_prefs[i])
 137			return 1;
 138	}
 139	return 0;
 140}
 141
 142/*
 143 * Try to set the server's pnfs module to the pnfs layout type specified by id.
 144 * Currently only one pNFS layout driver per filesystem is supported.
 145 *
 146 * @ids array of layout types supported by MDS.
 147 */
 148void
 149set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
 150		      struct nfs_fsinfo *fsinfo)
 151{
 152	struct pnfs_layoutdriver_type *ld_type = NULL;
 153	u32 id;
 154	int i;
 155
 156	if (fsinfo->nlayouttypes == 0)
 157		goto out_no_driver;
 158	if (!(server->nfs_client->cl_exchange_flags &
 159		 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
 160		printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
 161			__func__, server->nfs_client->cl_exchange_flags);
 162		goto out_no_driver;
 163	}
 164
 165	sort(fsinfo->layouttype, fsinfo->nlayouttypes,
 166		sizeof(*fsinfo->layouttype), ld_cmp, NULL);
 167
 168	for (i = 0; i < fsinfo->nlayouttypes; i++) {
 169		id = fsinfo->layouttype[i];
 170		ld_type = find_pnfs_driver(id);
 171		if (!ld_type) {
 172			request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
 173					id);
 174			ld_type = find_pnfs_driver(id);
 175		}
 176		if (ld_type)
 177			break;
 178	}
 179
 180	if (!ld_type) {
 181		dprintk("%s: No pNFS module found!\n", __func__);
 182		goto out_no_driver;
 183	}
 184
 185	server->pnfs_curr_ld = ld_type;
 186	if (ld_type->set_layoutdriver
 187	    && ld_type->set_layoutdriver(server, mntfh)) {
 188		printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
 189			"driver %u.\n", __func__, id);
 190		module_put(ld_type->owner);
 191		goto out_no_driver;
 192	}
 193	/* Bump the MDS count */
 194	atomic_inc(&server->nfs_client->cl_mds_count);
 195
 196	dprintk("%s: pNFS module for %u set\n", __func__, id);
 197	return;
 198
 199out_no_driver:
 200	dprintk("%s: Using NFSv4 I/O\n", __func__);
 201	server->pnfs_curr_ld = NULL;
 202}
 203
 204int
 205pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
 206{
 207	int status = -EINVAL;
 208	struct pnfs_layoutdriver_type *tmp;
 209
 210	if (ld_type->id == 0) {
 211		printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
 212		return status;
 213	}
 214	if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
 215		printk(KERN_ERR "NFS: %s Layout driver must provide "
 216		       "alloc_lseg and free_lseg.\n", __func__);
 217		return status;
 218	}
 219
 220	spin_lock(&pnfs_spinlock);
 221	tmp = find_pnfs_driver_locked(ld_type->id);
 222	if (!tmp) {
 223		list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
 224		status = 0;
 225		dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
 226			ld_type->name);
 227	} else {
 228		printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
 229			__func__, ld_type->id);
 230	}
 231	spin_unlock(&pnfs_spinlock);
 232
 233	return status;
 234}
 235EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
 236
 237void
 238pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
 239{
 240	dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
 241	spin_lock(&pnfs_spinlock);
 242	list_del(&ld_type->pnfs_tblid);
 243	spin_unlock(&pnfs_spinlock);
 244}
 245EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
 246
 247/*
 248 * pNFS client layout cache
 249 */
 250
 251/* Need to hold i_lock if caller does not already hold reference */
 252void
 253pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
 254{
 255	refcount_inc(&lo->plh_refcount);
 256}
 257
 258static struct pnfs_layout_hdr *
 259pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
 260{
 261	struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
 262	return ld->alloc_layout_hdr(ino, gfp_flags);
 263}
 264
 265static void
 266pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
 267{
 268	struct nfs_server *server = NFS_SERVER(lo->plh_inode);
 269	struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
 270
 271	if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
 272		struct nfs_client *clp = server->nfs_client;
 273
 274		spin_lock(&clp->cl_lock);
 275		list_del_rcu(&lo->plh_layouts);
 276		spin_unlock(&clp->cl_lock);
 277	}
 278	put_cred(lo->plh_lc_cred);
 279	return ld->free_layout_hdr(lo);
 280}
 281
 282static void
 283pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
 284{
 285	struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
 286	dprintk("%s: freeing layout cache %p\n", __func__, lo);
 287	nfsi->layout = NULL;
 288	/* Reset MDS Threshold I/O counters */
 289	nfsi->write_io = 0;
 290	nfsi->read_io = 0;
 291}
 292
 293void
 294pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
 295{
 296	struct inode *inode;
 297	unsigned long i_state;
 298
 299	if (!lo)
 300		return;
 301	inode = lo->plh_inode;
 302	pnfs_layoutreturn_before_put_layout_hdr(lo);
 303
 304	if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
 305		if (!list_empty(&lo->plh_segs))
 306			WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
 307		pnfs_detach_layout_hdr(lo);
 308		i_state = inode->i_state;
 309		spin_unlock(&inode->i_lock);
 310		pnfs_free_layout_hdr(lo);
 311		/* Notify pnfs_destroy_layout_final() that we're done */
 312		if (i_state & (I_FREEING | I_CLEAR))
 313			wake_up_var(lo);
 314	}
 315}
 316
 317static struct inode *
 318pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo)
 319{
 320	struct inode *inode = igrab(lo->plh_inode);
 321	if (inode)
 322		return inode;
 323	set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
 324	return NULL;
 325}
 326
 327/*
 328 * Compare 2 layout stateid sequence ids, to see which is newer,
 329 * taking into account wraparound issues.
 330 */
 331static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
 332{
 333	return (s32)(s1 - s2) > 0;
 334}
 335
 336static void pnfs_barrier_update(struct pnfs_layout_hdr *lo, u32 newseq)
 337{
 338	if (pnfs_seqid_is_newer(newseq, lo->plh_barrier) || !lo->plh_barrier)
 339		lo->plh_barrier = newseq;
 340}
 341
 342static void
 343pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
 344			 u32 seq)
 345{
 346	if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
 347		iomode = IOMODE_ANY;
 348	lo->plh_return_iomode = iomode;
 349	set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
 350	/*
 351	 * We must set lo->plh_return_seq to avoid livelocks with
 352	 * pnfs_layout_need_return()
 353	 */
 354	if (seq == 0)
 355		seq = be32_to_cpu(lo->plh_stateid.seqid);
 356	if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq))
 357		lo->plh_return_seq = seq;
 358	pnfs_barrier_update(lo, seq);
 359}
 360
 361static void
 362pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
 363{
 364	struct pnfs_layout_segment *lseg;
 365	lo->plh_return_iomode = 0;
 366	lo->plh_return_seq = 0;
 367	clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
 368	list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
 369		if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
 370			continue;
 371		pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
 372	}
 373}
 374
 375static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
 376{
 377	clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
 378	clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
 379	smp_mb__after_atomic();
 380	wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
 381	rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
 382}
 383
 384static void
 385pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
 386		struct list_head *free_me)
 387{
 388	clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
 389	clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
 390	if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
 391		pnfs_lseg_dec_and_remove_zero(lseg, free_me);
 392	if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
 393		pnfs_lseg_dec_and_remove_zero(lseg, free_me);
 394}
 395
 396/*
 397 * Update the seqid of a layout stateid after receiving
 398 * NFS4ERR_OLD_STATEID
 399 */
 400bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
 401		struct pnfs_layout_range *dst_range,
 402		struct inode *inode)
 403{
 404	struct pnfs_layout_hdr *lo;
 405	struct pnfs_layout_range range = {
 406		.iomode = IOMODE_ANY,
 407		.offset = 0,
 408		.length = NFS4_MAX_UINT64,
 409	};
 410	bool ret = false;
 411	LIST_HEAD(head);
 412	int err;
 413
 414	spin_lock(&inode->i_lock);
 415	lo = NFS_I(inode)->layout;
 416	if (lo &&  pnfs_layout_is_valid(lo) &&
 417	    nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
 418		/* Is our call using the most recent seqid? If so, bump it */
 419		if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) {
 420			nfs4_stateid_seqid_inc(dst);
 421			ret = true;
 422			goto out;
 423		}
 424		/* Try to update the seqid to the most recent */
 425		err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
 426		if (err != -EBUSY) {
 427			dst->seqid = lo->plh_stateid.seqid;
 428			*dst_range = range;
 429			ret = true;
 430		}
 431	}
 432out:
 433	spin_unlock(&inode->i_lock);
 434	pnfs_free_lseg_list(&head);
 435	return ret;
 436}
 437
 438/*
 439 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
 440 *
 441 * In order to continue using the pnfs_layout_hdr, a full recovery
 442 * is required.
 443 * Note that caller must hold inode->i_lock.
 444 */
 445int
 446pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
 447		struct list_head *lseg_list)
 448{
 449	struct pnfs_layout_range range = {
 450		.iomode = IOMODE_ANY,
 451		.offset = 0,
 452		.length = NFS4_MAX_UINT64,
 453	};
 454	struct pnfs_layout_segment *lseg, *next;
 455
 456	set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
 457	list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
 458		pnfs_clear_lseg_state(lseg, lseg_list);
 459	pnfs_clear_layoutreturn_info(lo);
 460	pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
 461	if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
 462	    !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
 463		pnfs_clear_layoutreturn_waitbit(lo);
 464	return !list_empty(&lo->plh_segs);
 465}
 466
 467static int
 468pnfs_iomode_to_fail_bit(u32 iomode)
 469{
 470	return iomode == IOMODE_RW ?
 471		NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
 472}
 473
 474static void
 475pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
 476{
 477	lo->plh_retry_timestamp = jiffies;
 478	if (!test_and_set_bit(fail_bit, &lo->plh_flags))
 479		refcount_inc(&lo->plh_refcount);
 480}
 481
 482static void
 483pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
 484{
 485	if (test_and_clear_bit(fail_bit, &lo->plh_flags))
 486		refcount_dec(&lo->plh_refcount);
 487}
 488
 489static void
 490pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
 491{
 492	struct inode *inode = lo->plh_inode;
 493	struct pnfs_layout_range range = {
 494		.iomode = iomode,
 495		.offset = 0,
 496		.length = NFS4_MAX_UINT64,
 497	};
 498	LIST_HEAD(head);
 499
 500	spin_lock(&inode->i_lock);
 501	pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
 502	pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
 503	spin_unlock(&inode->i_lock);
 504	pnfs_free_lseg_list(&head);
 505	dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
 506			iomode == IOMODE_RW ?  "RW" : "READ");
 507}
 508
 509static bool
 510pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
 511{
 512	unsigned long start, end;
 513	int fail_bit = pnfs_iomode_to_fail_bit(iomode);
 514
 515	if (test_bit(fail_bit, &lo->plh_flags) == 0)
 516		return false;
 517	end = jiffies;
 518	start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
 519	if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
 520		/* It is time to retry the failed layoutgets */
 521		pnfs_layout_clear_fail_bit(lo, fail_bit);
 522		return false;
 523	}
 524	return true;
 525}
 526
 527static void
 528pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
 529		const struct pnfs_layout_range *range,
 530		const nfs4_stateid *stateid)
 531{
 532	INIT_LIST_HEAD(&lseg->pls_list);
 533	INIT_LIST_HEAD(&lseg->pls_lc_list);
 534	INIT_LIST_HEAD(&lseg->pls_commits);
 535	refcount_set(&lseg->pls_refcount, 1);
 536	set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
 537	lseg->pls_layout = lo;
 538	lseg->pls_range = *range;
 539	lseg->pls_seq = be32_to_cpu(stateid->seqid);
 540}
 541
 542static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
 543{
 544	if (lseg != NULL) {
 545		struct inode *inode = lseg->pls_layout->plh_inode;
 546		NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
 547	}
 548}
 549
 550static void
 551pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
 552		struct pnfs_layout_segment *lseg)
 553{
 554	WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
 555	list_del_init(&lseg->pls_list);
 556	/* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
 557	refcount_dec(&lo->plh_refcount);
 558	if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
 559		return;
 560	if (list_empty(&lo->plh_segs) &&
 561	    !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
 562	    !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
 563		if (atomic_read(&lo->plh_outstanding) == 0)
 564			set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
 565		clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
 566	}
 567}
 568
 569static bool
 570pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
 571		struct pnfs_layout_segment *lseg)
 572{
 573	if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
 574	    pnfs_layout_is_valid(lo)) {
 575		pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
 576		list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
 577		return true;
 578	}
 579	return false;
 580}
 581
 582void
 583pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 584{
 585	struct pnfs_layout_hdr *lo;
 586	struct inode *inode;
 587
 588	if (!lseg)
 589		return;
 590
 591	dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
 592		refcount_read(&lseg->pls_refcount),
 593		test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
 594
 595	lo = lseg->pls_layout;
 596	inode = lo->plh_inode;
 597
 598	if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
 599		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
 600			spin_unlock(&inode->i_lock);
 601			return;
 602		}
 603		pnfs_get_layout_hdr(lo);
 604		pnfs_layout_remove_lseg(lo, lseg);
 605		if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
 606			lseg = NULL;
 607		spin_unlock(&inode->i_lock);
 608		pnfs_free_lseg(lseg);
 609		pnfs_put_layout_hdr(lo);
 610	}
 611}
 612EXPORT_SYMBOL_GPL(pnfs_put_lseg);
 613
 614/*
 615 * is l2 fully contained in l1?
 616 *   start1                             end1
 617 *   [----------------------------------)
 618 *           start2           end2
 619 *           [----------------)
 620 */
 621static bool
 622pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
 623		 const struct pnfs_layout_range *l2)
 624{
 625	u64 start1 = l1->offset;
 626	u64 end1 = pnfs_end_offset(start1, l1->length);
 627	u64 start2 = l2->offset;
 628	u64 end2 = pnfs_end_offset(start2, l2->length);
 629
 630	return (start1 <= start2) && (end1 >= end2);
 631}
 632
 633static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
 634		struct list_head *tmp_list)
 635{
 636	if (!refcount_dec_and_test(&lseg->pls_refcount))
 637		return false;
 638	pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
 639	list_add(&lseg->pls_list, tmp_list);
 640	return true;
 641}
 642
 643/* Returns 1 if lseg is removed from list, 0 otherwise */
 644static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
 645			     struct list_head *tmp_list)
 646{
 647	int rv = 0;
 648
 649	if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
 650		/* Remove the reference keeping the lseg in the
 651		 * list.  It will now be removed when all
 652		 * outstanding io is finished.
 653		 */
 654		dprintk("%s: lseg %p ref %d\n", __func__, lseg,
 655			refcount_read(&lseg->pls_refcount));
 656		if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
 657			rv = 1;
 658	}
 659	return rv;
 660}
 661
 
 
 
 
 
 
 
 
 
 662static bool
 663pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
 664		 const struct pnfs_layout_range *recall_range)
 665{
 666	return (recall_range->iomode == IOMODE_ANY ||
 667		lseg_range->iomode == recall_range->iomode) &&
 668	       pnfs_lseg_range_intersecting(lseg_range, recall_range);
 669}
 670
 671static bool
 672pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
 673		const struct pnfs_layout_range *recall_range,
 674		u32 seq)
 675{
 676	if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
 677		return false;
 678	if (recall_range == NULL)
 679		return true;
 680	return pnfs_should_free_range(&lseg->pls_range, recall_range);
 681}
 682
 683/**
 684 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
 685 * @lo: layout header containing the lsegs
 686 * @tmp_list: list head where doomed lsegs should go
 687 * @recall_range: optional recall range argument to match (may be NULL)
 688 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
 689 *
 690 * Walk the list of lsegs in the layout header, and tear down any that should
 691 * be destroyed. If "recall_range" is specified then the segment must match
 692 * that range. If "seq" is non-zero, then only match segments that were handed
 693 * out at or before that sequence.
 694 *
 695 * Returns number of matching invalid lsegs remaining in list after scanning
 696 * it and purging them.
 697 */
 698int
 699pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 700			    struct list_head *tmp_list,
 701			    const struct pnfs_layout_range *recall_range,
 702			    u32 seq)
 703{
 704	struct pnfs_layout_segment *lseg, *next;
 705	int remaining = 0;
 706
 707	dprintk("%s:Begin lo %p\n", __func__, lo);
 708
 709	if (list_empty(&lo->plh_segs))
 710		return 0;
 711	list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
 712		if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
 713			dprintk("%s: freeing lseg %p iomode %d seq %u "
 714				"offset %llu length %llu\n", __func__,
 715				lseg, lseg->pls_range.iomode, lseg->pls_seq,
 716				lseg->pls_range.offset, lseg->pls_range.length);
 717			if (!mark_lseg_invalid(lseg, tmp_list))
 718				remaining++;
 719		}
 720	dprintk("%s:Return %i\n", __func__, remaining);
 721	return remaining;
 722}
 723
 724static void
 725pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
 726		struct list_head *free_me,
 727		const struct pnfs_layout_range *range,
 728		u32 seq)
 729{
 730	struct pnfs_layout_segment *lseg, *next;
 731
 732	list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
 733		if (pnfs_match_lseg_recall(lseg, range, seq))
 734			list_move_tail(&lseg->pls_list, free_me);
 735	}
 736}
 737
 738/* note free_me must contain lsegs from a single layout_hdr */
 739void
 740pnfs_free_lseg_list(struct list_head *free_me)
 741{
 742	struct pnfs_layout_segment *lseg, *tmp;
 743
 744	if (list_empty(free_me))
 745		return;
 746
 747	list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
 748		list_del(&lseg->pls_list);
 749		pnfs_free_lseg(lseg);
 750	}
 751}
 752
 753static struct pnfs_layout_hdr *__pnfs_destroy_layout(struct nfs_inode *nfsi)
 
 754{
 755	struct pnfs_layout_hdr *lo;
 756	LIST_HEAD(tmp_list);
 757
 758	spin_lock(&nfsi->vfs_inode.i_lock);
 759	lo = nfsi->layout;
 760	if (lo) {
 761		pnfs_get_layout_hdr(lo);
 762		pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
 763		pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
 764		pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
 765		spin_unlock(&nfsi->vfs_inode.i_lock);
 766		pnfs_free_lseg_list(&tmp_list);
 767		nfs_commit_inode(&nfsi->vfs_inode, 0);
 768		pnfs_put_layout_hdr(lo);
 769	} else
 770		spin_unlock(&nfsi->vfs_inode.i_lock);
 771	return lo;
 772}
 773
 774void pnfs_destroy_layout(struct nfs_inode *nfsi)
 775{
 776	__pnfs_destroy_layout(nfsi);
 777}
 778EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
 779
 780static bool pnfs_layout_removed(struct nfs_inode *nfsi,
 781				struct pnfs_layout_hdr *lo)
 782{
 783	bool ret;
 784
 785	spin_lock(&nfsi->vfs_inode.i_lock);
 786	ret = nfsi->layout != lo;
 787	spin_unlock(&nfsi->vfs_inode.i_lock);
 788	return ret;
 789}
 790
 791void pnfs_destroy_layout_final(struct nfs_inode *nfsi)
 792{
 793	struct pnfs_layout_hdr *lo = __pnfs_destroy_layout(nfsi);
 794
 795	if (lo)
 796		wait_var_event(lo, pnfs_layout_removed(nfsi, lo));
 797}
 798
 799static bool
 800pnfs_layout_add_bulk_destroy_list(struct inode *inode,
 801		struct list_head *layout_list)
 802{
 803	struct pnfs_layout_hdr *lo;
 804	bool ret = false;
 805
 806	spin_lock(&inode->i_lock);
 807	lo = NFS_I(inode)->layout;
 808	if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
 809		pnfs_get_layout_hdr(lo);
 810		list_add(&lo->plh_bulk_destroy, layout_list);
 811		ret = true;
 812	}
 813	spin_unlock(&inode->i_lock);
 814	return ret;
 815}
 816
 817/* Caller must hold rcu_read_lock and clp->cl_lock */
 818static int
 819pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
 820		struct nfs_server *server,
 821		struct list_head *layout_list)
 822	__must_hold(&clp->cl_lock)
 823	__must_hold(RCU)
 824{
 825	struct pnfs_layout_hdr *lo, *next;
 826	struct inode *inode;
 827
 828	list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
 829		if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
 830		    test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) ||
 831		    !list_empty(&lo->plh_bulk_destroy))
 
 832			continue;
 833		/* If the sb is being destroyed, just bail */
 834		if (!nfs_sb_active(server->super))
 835			break;
 836		inode = pnfs_grab_inode_layout_hdr(lo);
 837		if (inode != NULL) {
 838			if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags))
 839				list_del_rcu(&lo->plh_layouts);
 840			if (pnfs_layout_add_bulk_destroy_list(inode,
 841						layout_list))
 842				continue;
 843			rcu_read_unlock();
 844			spin_unlock(&clp->cl_lock);
 845			iput(inode);
 846		} else {
 847			rcu_read_unlock();
 848			spin_unlock(&clp->cl_lock);
 849		}
 850		nfs_sb_deactive(server->super);
 851		spin_lock(&clp->cl_lock);
 852		rcu_read_lock();
 853		return -EAGAIN;
 854	}
 855	return 0;
 856}
 857
 858static int
 859pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
 860		bool is_bulk_recall)
 861{
 862	struct pnfs_layout_hdr *lo;
 863	struct inode *inode;
 864	LIST_HEAD(lseg_list);
 865	int ret = 0;
 866
 867	while (!list_empty(layout_list)) {
 868		lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
 869				plh_bulk_destroy);
 870		dprintk("%s freeing layout for inode %lu\n", __func__,
 871			lo->plh_inode->i_ino);
 872		inode = lo->plh_inode;
 873
 874		pnfs_layoutcommit_inode(inode, false);
 875
 876		spin_lock(&inode->i_lock);
 877		list_del_init(&lo->plh_bulk_destroy);
 878		if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
 879			if (is_bulk_recall)
 880				set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
 881			ret = -EAGAIN;
 882		}
 883		spin_unlock(&inode->i_lock);
 884		pnfs_free_lseg_list(&lseg_list);
 885		/* Free all lsegs that are attached to commit buckets */
 886		nfs_commit_inode(inode, 0);
 887		pnfs_put_layout_hdr(lo);
 888		nfs_iput_and_deactive(inode);
 889	}
 890	return ret;
 891}
 892
 893int
 894pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 895		struct nfs_fsid *fsid,
 896		bool is_recall)
 897{
 898	struct nfs_server *server;
 899	LIST_HEAD(layout_list);
 900
 901	spin_lock(&clp->cl_lock);
 902	rcu_read_lock();
 903restart:
 904	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 905		if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
 906			continue;
 907		if (pnfs_layout_bulk_destroy_byserver_locked(clp,
 908				server,
 909				&layout_list) != 0)
 910			goto restart;
 911	}
 912	rcu_read_unlock();
 913	spin_unlock(&clp->cl_lock);
 914
 915	if (list_empty(&layout_list))
 916		return 0;
 917	return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
 918}
 919
 920int
 921pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 922		bool is_recall)
 923{
 924	struct nfs_server *server;
 925	LIST_HEAD(layout_list);
 926
 927	spin_lock(&clp->cl_lock);
 928	rcu_read_lock();
 929restart:
 930	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 931		if (pnfs_layout_bulk_destroy_byserver_locked(clp,
 932					server,
 933					&layout_list) != 0)
 934			goto restart;
 935	}
 936	rcu_read_unlock();
 937	spin_unlock(&clp->cl_lock);
 938
 939	if (list_empty(&layout_list))
 940		return 0;
 941	return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
 942}
 943
 944/*
 945 * Called by the state manager to remove all layouts established under an
 946 * expired lease.
 947 */
 948void
 949pnfs_destroy_all_layouts(struct nfs_client *clp)
 950{
 951	nfs4_deviceid_mark_client_invalid(clp);
 952	nfs4_deviceid_purge_client(clp);
 953
 954	pnfs_destroy_layouts_byclid(clp, false);
 955}
 956
 957static void
 958pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred)
 959{
 960	const struct cred *old;
 961
 962	if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) {
 963		old = xchg(&lo->plh_lc_cred, get_cred(cred));
 964		put_cred(old);
 965	}
 966}
 967
 968/* update lo->plh_stateid with new if is more recent */
 969void
 970pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
 971			const struct cred *cred, bool update_barrier)
 972{
 973	u32 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
 974	u32 newseq = be32_to_cpu(new->seqid);
 
 
 975
 976	if (!pnfs_layout_is_valid(lo)) {
 977		pnfs_set_layout_cred(lo, cred);
 978		nfs4_stateid_copy(&lo->plh_stateid, new);
 979		lo->plh_barrier = newseq;
 980		pnfs_clear_layoutreturn_info(lo);
 981		clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
 982		return;
 983	}
 984
 985	if (pnfs_seqid_is_newer(newseq, oldseq))
 986		nfs4_stateid_copy(&lo->plh_stateid, new);
 987
 988	if (update_barrier) {
 989		pnfs_barrier_update(lo, newseq);
 
 
 
 
 
 
 990		return;
 991	}
 992	/*
 993	 * Because of wraparound, we want to keep the barrier
 994	 * "close" to the current seqids. We really only want to
 995	 * get here from a layoutget call.
 996	 */
 997	if (atomic_read(&lo->plh_outstanding) == 1)
 998		 pnfs_barrier_update(lo, be32_to_cpu(lo->plh_stateid.seqid));
 999}
1000
1001static bool
1002pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
1003		const nfs4_stateid *stateid)
1004{
1005	u32 seqid = be32_to_cpu(stateid->seqid);
1006
1007	return lo->plh_barrier && pnfs_seqid_is_newer(lo->plh_barrier, seqid);
1008}
1009
1010/* lget is set to 1 if called from inside send_layoutget call chain */
1011static bool
1012pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
1013{
1014	return lo->plh_block_lgets ||
1015		test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
1016}
1017
1018static struct nfs_server *
1019pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
1020{
1021	struct nfs_server *server;
1022
1023	if (inode) {
1024		server = NFS_SERVER(inode);
1025	} else {
1026		struct dentry *parent_dir = dget_parent(ctx->dentry);
1027		server = NFS_SERVER(parent_dir->d_inode);
1028		dput(parent_dir);
1029	}
1030	return server;
1031}
1032
1033static void nfs4_free_pages(struct page **pages, size_t size)
1034{
1035	int i;
1036
1037	if (!pages)
1038		return;
1039
1040	for (i = 0; i < size; i++) {
1041		if (!pages[i])
1042			break;
1043		__free_page(pages[i]);
1044	}
1045	kfree(pages);
1046}
1047
1048static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
1049{
1050	struct page **pages;
1051	int i;
1052
1053	pages = kmalloc_array(size, sizeof(struct page *), gfp_flags);
1054	if (!pages) {
1055		dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
1056		return NULL;
1057	}
1058
1059	for (i = 0; i < size; i++) {
1060		pages[i] = alloc_page(gfp_flags);
1061		if (!pages[i]) {
1062			dprintk("%s: failed to allocate page\n", __func__);
1063			nfs4_free_pages(pages, i);
1064			return NULL;
1065		}
1066	}
1067
1068	return pages;
1069}
1070
1071static struct nfs4_layoutget *
1072pnfs_alloc_init_layoutget_args(struct inode *ino,
1073	   struct nfs_open_context *ctx,
1074	   const nfs4_stateid *stateid,
1075	   const struct pnfs_layout_range *range,
1076	   gfp_t gfp_flags)
1077{
1078	struct nfs_server *server = pnfs_find_server(ino, ctx);
1079	size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response;
1080	size_t max_pages = max_response_pages(server);
1081	struct nfs4_layoutget *lgp;
 
1082
1083	dprintk("--> %s\n", __func__);
1084
 
 
 
 
 
1085	lgp = kzalloc(sizeof(*lgp), gfp_flags);
1086	if (lgp == NULL)
1087		return NULL;
1088
1089	if (max_reply_sz) {
1090		size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT;
1091		if (npages < max_pages)
1092			max_pages = npages;
1093	}
1094
1095	lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1096	if (!lgp->args.layout.pages) {
1097		kfree(lgp);
1098		return NULL;
1099	}
1100	lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1101	lgp->res.layoutp = &lgp->args.layout;
1102
1103	/* Don't confuse uninitialised result and success */
1104	lgp->res.status = -NFS4ERR_DELAY;
1105
1106	lgp->args.minlength = PAGE_SIZE;
1107	if (lgp->args.minlength > range->length)
1108		lgp->args.minlength = range->length;
1109	if (ino) {
1110		loff_t i_size = i_size_read(ino);
1111
1112		if (range->iomode == IOMODE_READ) {
1113			if (range->offset >= i_size)
1114				lgp->args.minlength = 0;
1115			else if (i_size - range->offset < lgp->args.minlength)
1116				lgp->args.minlength = i_size - range->offset;
1117		}
1118	}
1119	lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1120	pnfs_copy_range(&lgp->args.range, range);
1121	lgp->args.type = server->pnfs_curr_ld->id;
1122	lgp->args.inode = ino;
1123	lgp->args.ctx = get_nfs_open_context(ctx);
1124	nfs4_stateid_copy(&lgp->args.stateid, stateid);
1125	lgp->gfp_flags = gfp_flags;
1126	lgp->cred = ctx->cred;
1127	return lgp;
1128}
1129
1130void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1131{
1132	size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1133
1134	nfs4_free_pages(lgp->args.layout.pages, max_pages);
1135	pnfs_put_layout_hdr(lgp->lo);
1136	put_nfs_open_context(lgp->args.ctx);
1137	kfree(lgp);
1138}
1139
1140static void pnfs_clear_layoutcommit(struct inode *inode,
1141		struct list_head *head)
1142{
1143	struct nfs_inode *nfsi = NFS_I(inode);
1144	struct pnfs_layout_segment *lseg, *tmp;
1145
1146	if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1147		return;
1148	list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1149		if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1150			continue;
1151		pnfs_lseg_dec_and_remove_zero(lseg, head);
1152	}
1153}
1154
1155void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
1156		const nfs4_stateid *arg_stateid,
1157		const struct pnfs_layout_range *range,
1158		const nfs4_stateid *stateid)
1159{
1160	struct inode *inode = lo->plh_inode;
1161	LIST_HEAD(freeme);
1162
1163	spin_lock(&inode->i_lock);
1164	if (!pnfs_layout_is_valid(lo) ||
1165	    !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1166		goto out_unlock;
1167	if (stateid) {
1168		u32 seq = be32_to_cpu(arg_stateid->seqid);
1169
1170		pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1171		pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1172		pnfs_set_layout_stateid(lo, stateid, NULL, true);
1173	} else
1174		pnfs_mark_layout_stateid_invalid(lo, &freeme);
1175out_unlock:
1176	pnfs_clear_layoutreturn_waitbit(lo);
1177	spin_unlock(&inode->i_lock);
1178	pnfs_free_lseg_list(&freeme);
1179
1180}
1181
1182static bool
1183pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1184		nfs4_stateid *stateid,
1185		const struct cred **cred,
1186		enum pnfs_iomode *iomode)
1187{
1188	/* Serialise LAYOUTGET/LAYOUTRETURN */
1189	if (atomic_read(&lo->plh_outstanding) != 0)
1190		return false;
1191	if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1192		return false;
1193	set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1194	pnfs_get_layout_hdr(lo);
1195	nfs4_stateid_copy(stateid, &lo->plh_stateid);
1196	*cred = get_cred(lo->plh_lc_cred);
1197	if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1198		if (lo->plh_return_seq != 0)
1199			stateid->seqid = cpu_to_be32(lo->plh_return_seq);
 
 
 
1200		if (iomode != NULL)
1201			*iomode = lo->plh_return_iomode;
1202		pnfs_clear_layoutreturn_info(lo);
1203	} else if (iomode != NULL)
 
 
 
 
1204		*iomode = IOMODE_ANY;
1205	pnfs_barrier_update(lo, be32_to_cpu(stateid->seqid));
1206	return true;
1207}
1208
1209static void
1210pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1211		struct pnfs_layout_hdr *lo,
1212		const nfs4_stateid *stateid,
1213		enum pnfs_iomode iomode)
1214{
1215	struct inode *inode = lo->plh_inode;
1216
1217	args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1218	args->inode = inode;
1219	args->range.iomode = iomode;
1220	args->range.offset = 0;
1221	args->range.length = NFS4_MAX_UINT64;
1222	args->layout = lo;
1223	nfs4_stateid_copy(&args->stateid, stateid);
1224}
1225
1226static int
1227pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo,
1228		       const nfs4_stateid *stateid,
1229		       const struct cred **pcred,
1230		       enum pnfs_iomode iomode,
1231		       bool sync)
1232{
1233	struct inode *ino = lo->plh_inode;
1234	struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1235	struct nfs4_layoutreturn *lrp;
1236	const struct cred *cred = *pcred;
1237	int status = 0;
1238
1239	*pcred = NULL;
1240	lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1241	if (unlikely(lrp == NULL)) {
1242		status = -ENOMEM;
1243		spin_lock(&ino->i_lock);
1244		pnfs_clear_layoutreturn_waitbit(lo);
1245		spin_unlock(&ino->i_lock);
1246		put_cred(cred);
1247		pnfs_put_layout_hdr(lo);
1248		goto out;
1249	}
1250
1251	pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1252	lrp->args.ld_private = &lrp->ld_private;
1253	lrp->clp = NFS_SERVER(ino)->nfs_client;
1254	lrp->cred = cred;
1255	if (ld->prepare_layoutreturn)
1256		ld->prepare_layoutreturn(&lrp->args);
1257
1258	status = nfs4_proc_layoutreturn(lrp, sync);
1259out:
1260	dprintk("<-- %s status: %d\n", __func__, status);
1261	return status;
1262}
1263
1264static bool
1265pnfs_layout_segments_returnable(struct pnfs_layout_hdr *lo,
1266				enum pnfs_iomode iomode,
1267				u32 seq)
1268{
1269	struct pnfs_layout_range recall_range = {
1270		.length = NFS4_MAX_UINT64,
1271		.iomode = iomode,
1272	};
1273	return pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs,
1274					       &recall_range, seq) != -EBUSY;
1275}
1276
1277/* Return true if layoutreturn is needed */
1278static bool
1279pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1280{
 
 
1281	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1282		return false;
1283	return pnfs_layout_segments_returnable(lo, lo->plh_return_iomode,
1284					       lo->plh_return_seq);
 
 
 
 
 
 
1285}
1286
1287static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1288{
1289	struct inode *inode= lo->plh_inode;
1290
1291	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1292		return;
1293	spin_lock(&inode->i_lock);
1294	if (pnfs_layout_need_return(lo)) {
1295		const struct cred *cred;
1296		nfs4_stateid stateid;
1297		enum pnfs_iomode iomode;
1298		bool send;
1299
1300		send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
1301		spin_unlock(&inode->i_lock);
1302		if (send) {
1303			/* Send an async layoutreturn so we dont deadlock */
1304			pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
1305		}
1306	} else
1307		spin_unlock(&inode->i_lock);
1308}
1309
1310/*
1311 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1312 * when the layout segment list is empty.
1313 *
1314 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1315 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1316 * deviceid is marked invalid.
1317 */
1318int
1319_pnfs_return_layout(struct inode *ino)
1320{
1321	struct pnfs_layout_hdr *lo = NULL;
1322	struct nfs_inode *nfsi = NFS_I(ino);
1323	struct pnfs_layout_range range = {
1324		.iomode		= IOMODE_ANY,
1325		.offset		= 0,
1326		.length		= NFS4_MAX_UINT64,
1327	};
1328	LIST_HEAD(tmp_list);
1329	const struct cred *cred;
1330	nfs4_stateid stateid;
1331	int status = 0;
1332	bool send, valid_layout;
1333
1334	dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1335
1336	spin_lock(&ino->i_lock);
1337	lo = nfsi->layout;
1338	if (!lo) {
1339		spin_unlock(&ino->i_lock);
1340		dprintk("NFS: %s no layout to return\n", __func__);
1341		goto out;
1342	}
1343	/* Reference matched in nfs4_layoutreturn_release */
1344	pnfs_get_layout_hdr(lo);
1345	/* Is there an outstanding layoutreturn ? */
1346	if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1347		spin_unlock(&ino->i_lock);
1348		if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1349					TASK_UNINTERRUPTIBLE))
1350			goto out_put_layout_hdr;
1351		spin_lock(&ino->i_lock);
1352	}
1353	valid_layout = pnfs_layout_is_valid(lo);
1354	pnfs_clear_layoutcommit(ino, &tmp_list);
1355	pnfs_mark_matching_lsegs_return(lo, &tmp_list, &range, 0);
1356
1357	if (NFS_SERVER(ino)->pnfs_curr_ld->return_range)
 
 
 
 
 
1358		NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
 
1359
1360	/* Don't send a LAYOUTRETURN if list was initially empty */
1361	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1362			!valid_layout) {
1363		spin_unlock(&ino->i_lock);
1364		dprintk("NFS: %s no layout segments to return\n", __func__);
1365		goto out_wait_layoutreturn;
1366	}
1367
1368	send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL);
1369	spin_unlock(&ino->i_lock);
1370	if (send)
1371		status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true);
1372out_wait_layoutreturn:
1373	wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE);
1374out_put_layout_hdr:
1375	pnfs_free_lseg_list(&tmp_list);
1376	pnfs_put_layout_hdr(lo);
1377out:
1378	dprintk("<-- %s status: %d\n", __func__, status);
1379	return status;
1380}
1381
1382int
1383pnfs_commit_and_return_layout(struct inode *inode)
1384{
1385	struct pnfs_layout_hdr *lo;
1386	int ret;
1387
1388	spin_lock(&inode->i_lock);
1389	lo = NFS_I(inode)->layout;
1390	if (lo == NULL) {
1391		spin_unlock(&inode->i_lock);
1392		return 0;
1393	}
1394	pnfs_get_layout_hdr(lo);
1395	/* Block new layoutgets and read/write to ds */
1396	lo->plh_block_lgets++;
1397	spin_unlock(&inode->i_lock);
1398	filemap_fdatawait(inode->i_mapping);
1399	ret = pnfs_layoutcommit_inode(inode, true);
1400	if (ret == 0)
1401		ret = _pnfs_return_layout(inode);
1402	spin_lock(&inode->i_lock);
1403	lo->plh_block_lgets--;
1404	spin_unlock(&inode->i_lock);
1405	pnfs_put_layout_hdr(lo);
1406	return ret;
1407}
1408
1409bool pnfs_roc(struct inode *ino,
1410		struct nfs4_layoutreturn_args *args,
1411		struct nfs4_layoutreturn_res *res,
1412		const struct cred *cred)
1413{
1414	struct nfs_inode *nfsi = NFS_I(ino);
1415	struct nfs_open_context *ctx;
1416	struct nfs4_state *state;
1417	struct pnfs_layout_hdr *lo;
1418	struct pnfs_layout_segment *lseg, *next;
1419	const struct cred *lc_cred;
1420	nfs4_stateid stateid;
1421	enum pnfs_iomode iomode = 0;
1422	bool layoutreturn = false, roc = false;
1423	bool skip_read = false;
1424
1425	if (!nfs_have_layout(ino))
1426		return false;
1427retry:
1428	rcu_read_lock();
1429	spin_lock(&ino->i_lock);
1430	lo = nfsi->layout;
1431	if (!lo || !pnfs_layout_is_valid(lo) ||
1432	    test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1433		lo = NULL;
1434		goto out_noroc;
1435	}
1436	pnfs_get_layout_hdr(lo);
1437	if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1438		spin_unlock(&ino->i_lock);
1439		rcu_read_unlock();
1440		wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1441				TASK_UNINTERRUPTIBLE);
1442		pnfs_put_layout_hdr(lo);
1443		goto retry;
1444	}
1445
1446	/* no roc if we hold a delegation */
1447	if (nfs4_check_delegation(ino, FMODE_READ)) {
1448		if (nfs4_check_delegation(ino, FMODE_WRITE))
1449			goto out_noroc;
1450		skip_read = true;
1451	}
1452
1453	list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1454		state = ctx->state;
1455		if (state == NULL)
1456			continue;
1457		/* Don't return layout if there is open file state */
1458		if (state->state & FMODE_WRITE)
1459			goto out_noroc;
1460		if (state->state & FMODE_READ)
1461			skip_read = true;
1462	}
1463
1464
1465	list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1466		if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1467			continue;
1468		/* If we are sending layoutreturn, invalidate all valid lsegs */
1469		if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1470			continue;
1471		/*
1472		 * Note: mark lseg for return so pnfs_layout_remove_lseg
1473		 * doesn't invalidate the layout for us.
1474		 */
1475		set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1476		if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1477			continue;
1478		pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1479	}
1480
1481	if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1482		goto out_noroc;
1483
1484	/* ROC in two conditions:
1485	 * 1. there are ROC lsegs
1486	 * 2. we don't send layoutreturn
1487	 */
1488	/* lo ref dropped in pnfs_roc_release() */
1489	layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode);
1490	/* If the creds don't match, we can't compound the layoutreturn */
1491	if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0)
1492		goto out_noroc;
1493
1494	roc = layoutreturn;
1495	pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1496	res->lrs_present = 0;
1497	layoutreturn = false;
1498	put_cred(lc_cred);
1499
1500out_noroc:
1501	spin_unlock(&ino->i_lock);
1502	rcu_read_unlock();
1503	pnfs_layoutcommit_inode(ino, true);
1504	if (roc) {
1505		struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1506		if (ld->prepare_layoutreturn)
1507			ld->prepare_layoutreturn(args);
1508		pnfs_put_layout_hdr(lo);
1509		return true;
1510	}
1511	if (layoutreturn)
1512		pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, true);
1513	pnfs_put_layout_hdr(lo);
1514	return false;
1515}
1516
1517int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp,
1518		  struct nfs4_layoutreturn_res **respp, int *ret)
1519{
1520	struct nfs4_layoutreturn_args *arg = *argpp;
1521	int retval = -EAGAIN;
1522
1523	if (!arg)
1524		return 0;
1525	/* Handle Layoutreturn errors */
1526	switch (*ret) {
1527	case 0:
1528		retval = 0;
1529		break;
1530	case -NFS4ERR_NOMATCHING_LAYOUT:
1531		/* Was there an RPC level error? If not, retry */
1532		if (task->tk_rpc_status == 0)
1533			break;
1534		/* If the call was not sent, let caller handle it */
1535		if (!RPC_WAS_SENT(task))
1536			return 0;
1537		/*
1538		 * Otherwise, assume the call succeeded and
1539		 * that we need to release the layout
1540		 */
1541		*ret = 0;
1542		(*respp)->lrs_present = 0;
1543		retval = 0;
1544		break;
1545	case -NFS4ERR_DELAY:
1546		/* Let the caller handle the retry */
1547		*ret = -NFS4ERR_NOMATCHING_LAYOUT;
1548		return 0;
1549	case -NFS4ERR_OLD_STATEID:
1550		if (!nfs4_layout_refresh_old_stateid(&arg->stateid,
1551						     &arg->range, arg->inode))
1552			break;
1553		*ret = -NFS4ERR_NOMATCHING_LAYOUT;
1554		return -EAGAIN;
1555	}
1556	*argpp = NULL;
1557	*respp = NULL;
1558	return retval;
1559}
1560
1561void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1562		struct nfs4_layoutreturn_res *res,
1563		int ret)
1564{
1565	struct pnfs_layout_hdr *lo = args->layout;
1566	struct inode *inode = args->inode;
1567	const nfs4_stateid *res_stateid = NULL;
1568	struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1569
1570	switch (ret) {
1571	case -NFS4ERR_NOMATCHING_LAYOUT:
1572		spin_lock(&inode->i_lock);
1573		if (pnfs_layout_is_valid(lo) &&
1574		    nfs4_stateid_match_other(&args->stateid, &lo->plh_stateid))
1575			pnfs_set_plh_return_info(lo, args->range.iomode, 0);
1576		pnfs_clear_layoutreturn_waitbit(lo);
1577		spin_unlock(&inode->i_lock);
1578		break;
1579	case 0:
1580		if (res->lrs_present)
1581			res_stateid = &res->stateid;
1582		fallthrough;
1583	default:
1584		pnfs_layoutreturn_free_lsegs(lo, &args->stateid, &args->range,
1585					     res_stateid);
1586	}
1587	trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret);
 
1588	if (ld_private && ld_private->ops && ld_private->ops->free)
1589		ld_private->ops->free(ld_private);
1590	pnfs_put_layout_hdr(lo);
 
1591}
1592
1593bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1594{
1595	struct nfs_inode *nfsi = NFS_I(ino);
1596        struct pnfs_layout_hdr *lo;
1597        bool sleep = false;
1598
1599	/* we might not have grabbed lo reference. so need to check under
1600	 * i_lock */
1601        spin_lock(&ino->i_lock);
1602        lo = nfsi->layout;
1603        if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1604                rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1605                sleep = true;
1606	}
1607        spin_unlock(&ino->i_lock);
1608        return sleep;
1609}
1610
1611/*
1612 * Compare two layout segments for sorting into layout cache.
1613 * We want to preferentially return RW over RO layouts, so ensure those
1614 * are seen first.
1615 */
1616static s64
1617pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1618	   const struct pnfs_layout_range *l2)
1619{
1620	s64 d;
1621
1622	/* high offset > low offset */
1623	d = l1->offset - l2->offset;
1624	if (d)
1625		return d;
1626
1627	/* short length > long length */
1628	d = l2->length - l1->length;
1629	if (d)
1630		return d;
1631
1632	/* read > read/write */
1633	return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1634}
1635
1636static bool
1637pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1638		const struct pnfs_layout_range *l2)
1639{
1640	return pnfs_lseg_range_cmp(l1, l2) > 0;
1641}
1642
1643static bool
1644pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1645		struct pnfs_layout_segment *old)
1646{
1647	return false;
1648}
1649
1650void
1651pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1652		   struct pnfs_layout_segment *lseg,
1653		   bool (*is_after)(const struct pnfs_layout_range *,
1654			   const struct pnfs_layout_range *),
1655		   bool (*do_merge)(struct pnfs_layout_segment *,
1656			   struct pnfs_layout_segment *),
1657		   struct list_head *free_me)
1658{
1659	struct pnfs_layout_segment *lp, *tmp;
1660
1661	dprintk("%s:Begin\n", __func__);
1662
1663	list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1664		if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1665			continue;
1666		if (do_merge(lseg, lp)) {
1667			mark_lseg_invalid(lp, free_me);
1668			continue;
1669		}
1670		if (is_after(&lseg->pls_range, &lp->pls_range))
1671			continue;
1672		list_add_tail(&lseg->pls_list, &lp->pls_list);
1673		dprintk("%s: inserted lseg %p "
1674			"iomode %d offset %llu length %llu before "
1675			"lp %p iomode %d offset %llu length %llu\n",
1676			__func__, lseg, lseg->pls_range.iomode,
1677			lseg->pls_range.offset, lseg->pls_range.length,
1678			lp, lp->pls_range.iomode, lp->pls_range.offset,
1679			lp->pls_range.length);
1680		goto out;
1681	}
1682	list_add_tail(&lseg->pls_list, &lo->plh_segs);
1683	dprintk("%s: inserted lseg %p "
1684		"iomode %d offset %llu length %llu at tail\n",
1685		__func__, lseg, lseg->pls_range.iomode,
1686		lseg->pls_range.offset, lseg->pls_range.length);
1687out:
1688	pnfs_get_layout_hdr(lo);
1689
1690	dprintk("%s:Return\n", __func__);
1691}
1692EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1693
1694static void
1695pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1696		   struct pnfs_layout_segment *lseg,
1697		   struct list_head *free_me)
1698{
1699	struct inode *inode = lo->plh_inode;
1700	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1701
1702	if (ld->add_lseg != NULL)
1703		ld->add_lseg(lo, lseg, free_me);
1704	else
1705		pnfs_generic_layout_insert_lseg(lo, lseg,
1706				pnfs_lseg_range_is_after,
1707				pnfs_lseg_no_merge,
1708				free_me);
1709}
1710
1711static struct pnfs_layout_hdr *
1712alloc_init_layout_hdr(struct inode *ino,
1713		      struct nfs_open_context *ctx,
1714		      gfp_t gfp_flags)
1715{
1716	struct pnfs_layout_hdr *lo;
1717
1718	lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1719	if (!lo)
1720		return NULL;
1721	refcount_set(&lo->plh_refcount, 1);
1722	INIT_LIST_HEAD(&lo->plh_layouts);
1723	INIT_LIST_HEAD(&lo->plh_segs);
1724	INIT_LIST_HEAD(&lo->plh_return_segs);
1725	INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1726	lo->plh_inode = ino;
1727	lo->plh_lc_cred = get_cred(ctx->cred);
1728	lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1729	return lo;
1730}
1731
1732static struct pnfs_layout_hdr *
1733pnfs_find_alloc_layout(struct inode *ino,
1734		       struct nfs_open_context *ctx,
1735		       gfp_t gfp_flags)
1736	__releases(&ino->i_lock)
1737	__acquires(&ino->i_lock)
1738{
1739	struct nfs_inode *nfsi = NFS_I(ino);
1740	struct pnfs_layout_hdr *new = NULL;
1741
1742	dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1743
1744	if (nfsi->layout != NULL)
1745		goto out_existing;
1746	spin_unlock(&ino->i_lock);
1747	new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1748	spin_lock(&ino->i_lock);
1749
1750	if (likely(nfsi->layout == NULL)) {	/* Won the race? */
1751		nfsi->layout = new;
1752		return new;
1753	} else if (new != NULL)
1754		pnfs_free_layout_hdr(new);
1755out_existing:
1756	pnfs_get_layout_hdr(nfsi->layout);
1757	return nfsi->layout;
1758}
1759
1760/*
1761 * iomode matching rules:
1762 * iomode	lseg	strict match
1763 *                      iomode
1764 * -----	-----	------ -----
1765 * ANY		READ	N/A    true
1766 * ANY		RW	N/A    true
1767 * RW		READ	N/A    false
1768 * RW		RW	N/A    true
1769 * READ		READ	N/A    true
1770 * READ		RW	true   false
1771 * READ		RW	false  true
1772 */
1773static bool
1774pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1775		 const struct pnfs_layout_range *range,
1776		 bool strict_iomode)
1777{
1778	struct pnfs_layout_range range1;
1779
1780	if ((range->iomode == IOMODE_RW &&
1781	     ls_range->iomode != IOMODE_RW) ||
1782	    (range->iomode != ls_range->iomode &&
1783	     strict_iomode) ||
1784	    !pnfs_lseg_range_intersecting(ls_range, range))
1785		return false;
1786
1787	/* range1 covers only the first byte in the range */
1788	range1 = *range;
1789	range1.length = 1;
1790	return pnfs_lseg_range_contained(ls_range, &range1);
1791}
1792
1793/*
1794 * lookup range in layout
1795 */
1796static struct pnfs_layout_segment *
1797pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1798		struct pnfs_layout_range *range,
1799		bool strict_iomode)
1800{
1801	struct pnfs_layout_segment *lseg, *ret = NULL;
1802
1803	dprintk("%s:Begin\n", __func__);
1804
1805	list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1806		if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
 
1807		    pnfs_lseg_range_match(&lseg->pls_range, range,
1808					  strict_iomode)) {
1809			ret = pnfs_get_lseg(lseg);
1810			break;
1811		}
1812	}
1813
1814	dprintk("%s:Return lseg %p ref %d\n",
1815		__func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1816	return ret;
1817}
1818
1819/*
1820 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1821 * to the MDS or over pNFS
1822 *
1823 * The nfs_inode read_io and write_io fields are cumulative counters reset
1824 * when there are no layout segments. Note that in pnfs_update_layout iomode
1825 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1826 * WRITE request.
1827 *
1828 * A return of true means use MDS I/O.
1829 *
1830 * From rfc 5661:
1831 * If a file's size is smaller than the file size threshold, data accesses
1832 * SHOULD be sent to the metadata server.  If an I/O request has a length that
1833 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1834 * server.  If both file size and I/O size are provided, the client SHOULD
1835 * reach or exceed  both thresholds before sending its read or write
1836 * requests to the data server.
1837 */
1838static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1839				     struct inode *ino, int iomode)
1840{
1841	struct nfs4_threshold *t = ctx->mdsthreshold;
1842	struct nfs_inode *nfsi = NFS_I(ino);
1843	loff_t fsize = i_size_read(ino);
1844	bool size = false, size_set = false, io = false, io_set = false, ret = false;
1845
1846	if (t == NULL)
1847		return ret;
1848
1849	dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1850		__func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1851
1852	switch (iomode) {
1853	case IOMODE_READ:
1854		if (t->bm & THRESHOLD_RD) {
1855			dprintk("%s fsize %llu\n", __func__, fsize);
1856			size_set = true;
1857			if (fsize < t->rd_sz)
1858				size = true;
1859		}
1860		if (t->bm & THRESHOLD_RD_IO) {
1861			dprintk("%s nfsi->read_io %llu\n", __func__,
1862				nfsi->read_io);
1863			io_set = true;
1864			if (nfsi->read_io < t->rd_io_sz)
1865				io = true;
1866		}
1867		break;
1868	case IOMODE_RW:
1869		if (t->bm & THRESHOLD_WR) {
1870			dprintk("%s fsize %llu\n", __func__, fsize);
1871			size_set = true;
1872			if (fsize < t->wr_sz)
1873				size = true;
1874		}
1875		if (t->bm & THRESHOLD_WR_IO) {
1876			dprintk("%s nfsi->write_io %llu\n", __func__,
1877				nfsi->write_io);
1878			io_set = true;
1879			if (nfsi->write_io < t->wr_io_sz)
1880				io = true;
1881		}
1882		break;
1883	}
1884	if (size_set && io_set) {
1885		if (size && io)
1886			ret = true;
1887	} else if (size || io)
1888		ret = true;
1889
1890	dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1891	return ret;
1892}
1893
1894static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1895{
1896	/*
1897	 * send layoutcommit as it can hold up layoutreturn due to lseg
1898	 * reference
1899	 */
1900	pnfs_layoutcommit_inode(lo->plh_inode, false);
1901	return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1902				   nfs_wait_bit_killable,
1903				   TASK_KILLABLE);
1904}
1905
1906static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
1907{
1908	atomic_inc(&lo->plh_outstanding);
1909}
1910
1911static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
1912{
1913	if (atomic_dec_and_test(&lo->plh_outstanding))
1914		wake_up_var(&lo->plh_outstanding);
1915}
1916
1917static bool pnfs_is_first_layoutget(struct pnfs_layout_hdr *lo)
1918{
1919	return test_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags);
1920}
1921
1922static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1923{
1924	unsigned long *bitlock = &lo->plh_flags;
1925
1926	clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1927	smp_mb__after_atomic();
1928	wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1929}
1930
1931static void _add_to_server_list(struct pnfs_layout_hdr *lo,
1932				struct nfs_server *server)
1933{
1934	if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
1935		struct nfs_client *clp = server->nfs_client;
1936
1937		/* The lo must be on the clp list if there is any
1938		 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1939		 */
1940		spin_lock(&clp->cl_lock);
1941		list_add_tail_rcu(&lo->plh_layouts, &server->layouts);
1942		spin_unlock(&clp->cl_lock);
1943	}
1944}
1945
1946/*
1947 * Layout segment is retreived from the server if not cached.
1948 * The appropriate layout segment is referenced and returned to the caller.
1949 */
1950struct pnfs_layout_segment *
1951pnfs_update_layout(struct inode *ino,
1952		   struct nfs_open_context *ctx,
1953		   loff_t pos,
1954		   u64 count,
1955		   enum pnfs_iomode iomode,
1956		   bool strict_iomode,
1957		   gfp_t gfp_flags)
1958{
1959	struct pnfs_layout_range arg = {
1960		.iomode = iomode,
1961		.offset = pos,
1962		.length = count,
1963	};
1964	unsigned pg_offset;
1965	struct nfs_server *server = NFS_SERVER(ino);
1966	struct nfs_client *clp = server->nfs_client;
1967	struct pnfs_layout_hdr *lo = NULL;
1968	struct pnfs_layout_segment *lseg = NULL;
1969	struct nfs4_layoutget *lgp;
1970	nfs4_stateid stateid;
1971	long timeout = 0;
1972	unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1973	bool first;
1974
1975	if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1976		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1977				 PNFS_UPDATE_LAYOUT_NO_PNFS);
1978		goto out;
1979	}
1980
 
 
 
 
 
 
1981	if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1982		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1983				 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1984		goto out;
1985	}
1986
1987lookup_again:
1988	lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
1989	if (IS_ERR(lseg))
1990		goto out;
1991	first = false;
1992	spin_lock(&ino->i_lock);
1993	lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1994	if (lo == NULL) {
1995		spin_unlock(&ino->i_lock);
1996		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1997				 PNFS_UPDATE_LAYOUT_NOMEM);
1998		goto out;
1999	}
2000
2001	/* Do we even need to bother with this? */
2002	if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
2003		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2004				 PNFS_UPDATE_LAYOUT_BULK_RECALL);
2005		dprintk("%s matches recall, use MDS\n", __func__);
2006		goto out_unlock;
2007	}
2008
2009	/* if LAYOUTGET already failed once we don't try again */
2010	if (pnfs_layout_io_test_failed(lo, iomode)) {
2011		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2012				 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
2013		goto out_unlock;
2014	}
2015
2016	/*
2017	 * If the layout segment list is empty, but there are outstanding
2018	 * layoutget calls, then they might be subject to a layoutrecall.
2019	 */
2020	if ((list_empty(&lo->plh_segs) || !pnfs_layout_is_valid(lo)) &&
2021	    atomic_read(&lo->plh_outstanding) != 0) {
2022		spin_unlock(&ino->i_lock);
2023		lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
2024					!atomic_read(&lo->plh_outstanding)));
2025		if (IS_ERR(lseg))
2026			goto out_put_layout_hdr;
2027		pnfs_put_layout_hdr(lo);
2028		goto lookup_again;
2029	}
2030
2031	/*
2032	 * Because we free lsegs when sending LAYOUTRETURN, we need to wait
2033	 * for LAYOUTRETURN.
2034	 */
2035	if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
2036		spin_unlock(&ino->i_lock);
2037		dprintk("%s wait for layoutreturn\n", __func__);
2038		lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
2039		if (!IS_ERR(lseg)) {
2040			pnfs_put_layout_hdr(lo);
2041			dprintk("%s retrying\n", __func__);
2042			trace_pnfs_update_layout(ino, pos, count, iomode, lo,
2043						 lseg,
2044						 PNFS_UPDATE_LAYOUT_RETRY);
2045			goto lookup_again;
2046		}
2047		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2048					 PNFS_UPDATE_LAYOUT_RETURN);
2049		goto out_put_layout_hdr;
2050	}
2051
2052	lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
2053	if (lseg) {
2054		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2055				PNFS_UPDATE_LAYOUT_FOUND_CACHED);
2056		goto out_unlock;
2057	}
2058
2059	/*
2060	 * Choose a stateid for the LAYOUTGET. If we don't have a layout
2061	 * stateid, or it has been invalidated, then we must use the open
2062	 * stateid.
2063	 */
2064	if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
2065		int status;
2066
2067		/*
2068		 * The first layoutget for the file. Need to serialize per
2069		 * RFC 5661 Errata 3208.
2070		 */
2071		if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
2072				     &lo->plh_flags)) {
2073			spin_unlock(&ino->i_lock);
2074			lseg = ERR_PTR(wait_on_bit(&lo->plh_flags,
2075						NFS_LAYOUT_FIRST_LAYOUTGET,
2076						TASK_KILLABLE));
2077			if (IS_ERR(lseg))
2078				goto out_put_layout_hdr;
2079			pnfs_put_layout_hdr(lo);
2080			dprintk("%s retrying\n", __func__);
2081			goto lookup_again;
2082		}
2083
2084		spin_unlock(&ino->i_lock);
2085		first = true;
2086		status = nfs4_select_rw_stateid(ctx->state,
2087					iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
2088					NULL, &stateid, NULL);
2089		if (status != 0) {
2090			lseg = ERR_PTR(status);
2091			trace_pnfs_update_layout(ino, pos, count,
2092					iomode, lo, lseg,
2093					PNFS_UPDATE_LAYOUT_INVALID_OPEN);
2094			nfs4_schedule_stateid_recovery(server, ctx->state);
2095			pnfs_clear_first_layoutget(lo);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2096			pnfs_put_layout_hdr(lo);
 
 
 
2097			goto lookup_again;
2098		}
2099		spin_lock(&ino->i_lock);
2100	} else {
2101		nfs4_stateid_copy(&stateid, &lo->plh_stateid);
2102	}
2103
2104	if (pnfs_layoutgets_blocked(lo)) {
2105		trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2106				PNFS_UPDATE_LAYOUT_BLOCKED);
2107		goto out_unlock;
2108	}
2109	nfs_layoutget_begin(lo);
2110	spin_unlock(&ino->i_lock);
2111
2112	_add_to_server_list(lo, server);
 
 
 
 
 
 
 
 
2113
2114	pg_offset = arg.offset & ~PAGE_MASK;
2115	if (pg_offset) {
2116		arg.offset -= pg_offset;
2117		arg.length += pg_offset;
2118	}
2119	if (arg.length != NFS4_MAX_UINT64)
2120		arg.length = PAGE_ALIGN(arg.length);
2121
2122	lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
2123	if (!lgp) {
2124		trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
2125					 PNFS_UPDATE_LAYOUT_NOMEM);
2126		nfs_layoutget_end(lo);
2127		goto out_put_layout_hdr;
2128	}
2129
2130	lgp->lo = lo;
2131	pnfs_get_layout_hdr(lo);
2132
2133	lseg = nfs4_proc_layoutget(lgp, &timeout);
2134	trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2135				 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
2136	nfs_layoutget_end(lo);
2137	if (IS_ERR(lseg)) {
2138		switch(PTR_ERR(lseg)) {
2139		case -EBUSY:
2140			if (time_after(jiffies, giveup))
2141				lseg = NULL;
2142			break;
2143		case -ERECALLCONFLICT:
 
 
 
 
 
 
 
 
 
2144		case -EAGAIN:
2145			break;
2146		default:
2147			if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
2148				pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2149				lseg = NULL;
2150			}
2151			goto out_put_layout_hdr;
2152		}
2153		if (lseg) {
2154			if (first)
2155				pnfs_clear_first_layoutget(lo);
2156			trace_pnfs_update_layout(ino, pos, count,
2157				iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
2158			pnfs_put_layout_hdr(lo);
2159			goto lookup_again;
2160		}
2161	} else {
2162		pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2163	}
2164
2165out_put_layout_hdr:
2166	if (first)
2167		pnfs_clear_first_layoutget(lo);
2168	trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2169				 PNFS_UPDATE_LAYOUT_EXIT);
2170	pnfs_put_layout_hdr(lo);
2171out:
2172	dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2173			"(%s, offset: %llu, length: %llu)\n",
2174			__func__, ino->i_sb->s_id,
2175			(unsigned long long)NFS_FILEID(ino),
2176			IS_ERR_OR_NULL(lseg) ? "not found" : "found",
2177			iomode==IOMODE_RW ?  "read/write" : "read-only",
2178			(unsigned long long)pos,
2179			(unsigned long long)count);
2180	return lseg;
2181out_unlock:
2182	spin_unlock(&ino->i_lock);
2183	goto out_put_layout_hdr;
2184}
2185EXPORT_SYMBOL_GPL(pnfs_update_layout);
2186
2187static bool
2188pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2189{
2190	switch (range->iomode) {
2191	case IOMODE_READ:
2192	case IOMODE_RW:
2193		break;
2194	default:
2195		return false;
2196	}
2197	if (range->offset == NFS4_MAX_UINT64)
2198		return false;
2199	if (range->length == 0)
2200		return false;
2201	if (range->length != NFS4_MAX_UINT64 &&
2202	    range->length > NFS4_MAX_UINT64 - range->offset)
2203		return false;
2204	return true;
2205}
2206
2207static struct pnfs_layout_hdr *
2208_pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2209{
2210	struct pnfs_layout_hdr *lo;
2211
2212	spin_lock(&ino->i_lock);
2213	lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL);
2214	if (!lo)
2215		goto out_unlock;
2216	if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2217		goto out_unlock;
2218	if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2219		goto out_unlock;
2220	if (pnfs_layoutgets_blocked(lo))
2221		goto out_unlock;
2222	if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2223		goto out_unlock;
2224	nfs_layoutget_begin(lo);
2225	spin_unlock(&ino->i_lock);
2226	_add_to_server_list(lo, NFS_SERVER(ino));
2227	return lo;
2228
2229out_unlock:
2230	spin_unlock(&ino->i_lock);
2231	pnfs_put_layout_hdr(lo);
2232	return NULL;
2233}
2234
2235static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2236				     struct nfs_open_context *ctx)
2237{
2238	struct inode *ino = data->dentry->d_inode;
2239	struct pnfs_layout_range rng = {
2240		.iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2241			  IOMODE_RW: IOMODE_READ,
2242		.offset = 0,
2243		.length = NFS4_MAX_UINT64,
2244	};
2245	struct nfs4_layoutget *lgp;
2246	struct pnfs_layout_hdr *lo;
2247
2248	/* Heuristic: don't send layoutget if we have cached data */
2249	if (rng.iomode == IOMODE_READ &&
2250	   (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2251		return;
2252
2253	lo = _pnfs_grab_empty_layout(ino, ctx);
2254	if (!lo)
2255		return;
2256	lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &current_stateid,
2257					     &rng, GFP_KERNEL);
2258	if (!lgp) {
2259		pnfs_clear_first_layoutget(lo);
2260		nfs_layoutget_end(lo);
2261		pnfs_put_layout_hdr(lo);
2262		return;
2263	}
2264	lgp->lo = lo;
2265	data->lgp = lgp;
2266	data->o_arg.lg_args = &lgp->args;
2267	data->o_res.lg_res = &lgp->res;
2268}
2269
2270static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2271				     struct nfs_open_context *ctx)
2272{
2273	struct inode *ino = data->dentry->d_inode;
2274	struct pnfs_layout_range rng = {
2275		.iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2276			  IOMODE_RW: IOMODE_READ,
2277		.offset = 0,
2278		.length = NFS4_MAX_UINT64,
2279	};
2280	struct nfs4_layoutget *lgp;
2281
2282	lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &current_stateid,
2283					     &rng, GFP_KERNEL);
2284	if (!lgp)
2285		return;
2286	data->lgp = lgp;
2287	data->o_arg.lg_args = &lgp->args;
2288	data->o_res.lg_res = &lgp->res;
2289}
2290
2291void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2292			 struct nfs_open_context *ctx)
2293{
2294	struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2295
2296	if (!(pnfs_enabled_sb(server) &&
2297	      server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2298		return;
2299	/* Could check on max_ops, but currently hardcoded high enough */
2300	if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2301		return;
2302	if (data->lgp)
2303		return;
2304	if (data->state)
2305		_lgopen_prepare_attached(data, ctx);
2306	else
2307		_lgopen_prepare_floating(data, ctx);
2308}
2309
2310void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2311		       struct nfs_open_context *ctx)
2312{
2313	struct pnfs_layout_hdr *lo;
2314	struct pnfs_layout_segment *lseg;
2315	struct nfs_server *srv = NFS_SERVER(ino);
2316	u32 iomode;
2317
2318	if (!lgp)
2319		return;
2320	dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2321	if (lgp->res.status) {
2322		switch (lgp->res.status) {
2323		default:
2324			break;
2325		/*
2326		 * Halt lgopen attempts if the server doesn't recognise
2327		 * the "current stateid" value, the layout type, or the
2328		 * layoutget operation as being valid.
2329		 * Also if it complains about too many ops in the compound
2330		 * or of the request/reply being too big.
2331		 */
2332		case -NFS4ERR_BAD_STATEID:
2333		case -NFS4ERR_NOTSUPP:
2334		case -NFS4ERR_REP_TOO_BIG:
2335		case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2336		case -NFS4ERR_REQ_TOO_BIG:
2337		case -NFS4ERR_TOO_MANY_OPS:
2338		case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
2339			srv->caps &= ~NFS_CAP_LGOPEN;
2340		}
2341		return;
2342	}
2343	if (!lgp->lo) {
2344		lo = _pnfs_grab_empty_layout(ino, ctx);
2345		if (!lo)
2346			return;
2347		lgp->lo = lo;
2348	} else
2349		lo = lgp->lo;
2350
2351	lseg = pnfs_layout_process(lgp);
2352	if (!IS_ERR(lseg)) {
2353		iomode = lgp->args.range.iomode;
2354		pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2355		pnfs_put_lseg(lseg);
2356	}
2357}
2358
2359void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2360{
2361	if (lgp != NULL) {
2362		if (lgp->lo) {
2363			pnfs_clear_first_layoutget(lgp->lo);
2364			nfs_layoutget_end(lgp->lo);
2365		}
2366		pnfs_layoutget_free(lgp);
2367	}
2368}
2369
2370struct pnfs_layout_segment *
2371pnfs_layout_process(struct nfs4_layoutget *lgp)
2372{
2373	struct pnfs_layout_hdr *lo = lgp->lo;
2374	struct nfs4_layoutget_res *res = &lgp->res;
2375	struct pnfs_layout_segment *lseg;
2376	struct inode *ino = lo->plh_inode;
2377	LIST_HEAD(free_me);
2378
2379	if (!pnfs_sanity_check_layout_range(&res->range))
2380		return ERR_PTR(-EINVAL);
2381
2382	/* Inject layout blob into I/O device driver */
2383	lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
2384	if (IS_ERR_OR_NULL(lseg)) {
2385		if (!lseg)
2386			lseg = ERR_PTR(-ENOMEM);
2387
2388		dprintk("%s: Could not allocate layout: error %ld\n",
2389		       __func__, PTR_ERR(lseg));
2390		return lseg;
2391	}
2392
2393	pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
2394
2395	spin_lock(&ino->i_lock);
2396	if (pnfs_layoutgets_blocked(lo)) {
2397		dprintk("%s forget reply due to state\n", __func__);
2398		goto out_forget;
2399	}
2400
2401	if (!pnfs_layout_is_valid(lo) && !pnfs_is_first_layoutget(lo))
2402		goto out_forget;
2403
2404	if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
2405		/* existing state ID, make sure the sequence number matches. */
2406		if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
2407			if (!pnfs_layout_is_valid(lo))
2408				lo->plh_barrier = 0;
2409			dprintk("%s forget reply due to sequence\n", __func__);
2410			goto out_forget;
2411		}
2412		pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false);
2413	} else if (pnfs_layout_is_valid(lo)) {
2414		/*
2415		 * We got an entirely new state ID.  Mark all segments for the
2416		 * inode invalid, and retry the layoutget
2417		 */
2418		struct pnfs_layout_range range = {
2419			.iomode = IOMODE_ANY,
2420			.length = NFS4_MAX_UINT64,
2421		};
2422		pnfs_mark_matching_lsegs_return(lo, &free_me, &range, 0);
2423		goto out_forget;
2424	} else {
2425		/* We have a completely new layout */
2426		pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true);
2427	}
2428
2429	pnfs_get_lseg(lseg);
2430	pnfs_layout_insert_lseg(lo, lseg, &free_me);
2431
2432
2433	if (res->return_on_close)
2434		set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
2435
2436	spin_unlock(&ino->i_lock);
2437	pnfs_free_lseg_list(&free_me);
2438	return lseg;
2439
2440out_forget:
2441	spin_unlock(&ino->i_lock);
2442	lseg->pls_layout = lo;
2443	NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
 
 
2444	return ERR_PTR(-EAGAIN);
2445}
2446
2447/**
2448 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2449 * @lo: pointer to layout header
2450 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2451 * @return_range: describe layout segment ranges to be returned
2452 * @seq: stateid seqid to match
2453 *
2454 * This function is mainly intended for use by layoutrecall. It attempts
2455 * to free the layout segment immediately, or else to mark it for return
2456 * as soon as its reference count drops to zero.
2457 *
2458 * Returns
2459 * - 0: a layoutreturn needs to be scheduled.
2460 * - EBUSY: there are layout segment that are still in use.
2461 * - ENOENT: there are no layout segments that need to be returned.
2462 */
2463int
2464pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2465				struct list_head *tmp_list,
2466				const struct pnfs_layout_range *return_range,
2467				u32 seq)
2468{
2469	struct pnfs_layout_segment *lseg, *next;
2470	int remaining = 0;
2471
2472	dprintk("%s:Begin lo %p\n", __func__, lo);
2473
 
 
 
2474	assert_spin_locked(&lo->plh_inode->i_lock);
2475
2476	if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2477		tmp_list = &lo->plh_return_segs;
2478
2479	list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2480		if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2481			dprintk("%s: marking lseg %p iomode %d "
2482				"offset %llu length %llu\n", __func__,
2483				lseg, lseg->pls_range.iomode,
2484				lseg->pls_range.offset,
2485				lseg->pls_range.length);
2486			if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2487				tmp_list = &lo->plh_return_segs;
2488			if (mark_lseg_invalid(lseg, tmp_list))
2489				continue;
2490			remaining++;
2491			set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2492		}
2493
2494	if (remaining) {
2495		pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2496		return -EBUSY;
2497	}
2498
2499	if (!list_empty(&lo->plh_return_segs)) {
2500		pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2501		return 0;
2502	}
2503
2504	return -ENOENT;
2505}
2506
2507static void
2508pnfs_mark_layout_for_return(struct inode *inode,
2509			    const struct pnfs_layout_range *range)
2510{
2511	struct pnfs_layout_hdr *lo;
 
 
 
 
 
2512	bool return_now = false;
2513
2514	spin_lock(&inode->i_lock);
2515	lo = NFS_I(inode)->layout;
2516	if (!pnfs_layout_is_valid(lo)) {
2517		spin_unlock(&inode->i_lock);
2518		return;
2519	}
2520	pnfs_set_plh_return_info(lo, range->iomode, 0);
2521	/*
2522	 * mark all matching lsegs so that we are sure to have no live
2523	 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2524	 * for how it works.
2525	 */
2526	if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) {
2527		const struct cred *cred;
2528		nfs4_stateid stateid;
2529		enum pnfs_iomode iomode;
2530
2531		return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
2532		spin_unlock(&inode->i_lock);
2533		if (return_now)
2534			pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
2535	} else {
2536		spin_unlock(&inode->i_lock);
2537		nfs_commit_inode(inode, 0);
2538	}
2539}
2540
2541void pnfs_error_mark_layout_for_return(struct inode *inode,
2542				       struct pnfs_layout_segment *lseg)
2543{
2544	struct pnfs_layout_range range = {
2545		.iomode = lseg->pls_range.iomode,
2546		.offset = 0,
2547		.length = NFS4_MAX_UINT64,
2548	};
2549
2550	pnfs_mark_layout_for_return(inode, &range);
2551}
2552EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2553
2554static bool
2555pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo)
2556{
2557	return pnfs_layout_is_valid(lo) &&
2558		!test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) &&
2559		!test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
2560}
2561
2562static struct pnfs_layout_segment *
2563pnfs_find_first_lseg(struct pnfs_layout_hdr *lo,
2564		     const struct pnfs_layout_range *range,
2565		     enum pnfs_iomode iomode)
2566{
2567	struct pnfs_layout_segment *lseg;
2568
2569	list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
2570		if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
2571			continue;
2572		if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2573			continue;
2574		if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY)
2575			continue;
2576		if (pnfs_lseg_range_intersecting(&lseg->pls_range, range))
2577			return lseg;
2578	}
2579	return NULL;
2580}
2581
2582/* Find open file states whose mode matches that of the range */
2583static bool
2584pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo,
2585				 const struct pnfs_layout_range *range)
2586{
2587	struct list_head *head;
2588	struct nfs_open_context *ctx;
2589	fmode_t mode = 0;
2590
2591	if (!pnfs_layout_can_be_returned(lo) ||
2592	    !pnfs_find_first_lseg(lo, range, range->iomode))
2593		return false;
2594
2595	head = &NFS_I(lo->plh_inode)->open_files;
2596	list_for_each_entry_rcu(ctx, head, list) {
2597		if (ctx->state)
2598			mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE);
2599	}
2600
2601	switch (range->iomode) {
2602	default:
2603		break;
2604	case IOMODE_READ:
2605		mode &= ~FMODE_WRITE;
2606		break;
2607	case IOMODE_RW:
2608		if (pnfs_find_first_lseg(lo, range, IOMODE_READ))
2609			mode &= ~FMODE_READ;
2610	}
2611	return mode == 0;
2612}
2613
2614static int
2615pnfs_layout_return_unused_byserver(struct nfs_server *server, void *data)
2616{
2617	const struct pnfs_layout_range *range = data;
2618	struct pnfs_layout_hdr *lo;
2619	struct inode *inode;
2620restart:
2621	rcu_read_lock();
2622	list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
2623		if (!pnfs_layout_can_be_returned(lo) ||
2624		    test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2625			continue;
2626		inode = lo->plh_inode;
2627		spin_lock(&inode->i_lock);
2628		if (!pnfs_should_return_unused_layout(lo, range)) {
2629			spin_unlock(&inode->i_lock);
2630			continue;
2631		}
2632		spin_unlock(&inode->i_lock);
2633		inode = pnfs_grab_inode_layout_hdr(lo);
2634		if (!inode)
2635			continue;
2636		rcu_read_unlock();
2637		pnfs_mark_layout_for_return(inode, range);
2638		iput(inode);
2639		cond_resched();
2640		goto restart;
2641	}
2642	rcu_read_unlock();
2643	return 0;
2644}
2645
2646void
2647pnfs_layout_return_unused_byclid(struct nfs_client *clp,
2648				 enum pnfs_iomode iomode)
2649{
2650	struct pnfs_layout_range range = {
2651		.iomode = iomode,
2652		.offset = 0,
2653		.length = NFS4_MAX_UINT64,
2654	};
2655
2656	nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver,
2657			&range);
2658}
2659
2660void
2661pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2662{
2663	if (pgio->pg_lseg == NULL ||
2664	    test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2665		return;
2666	pnfs_put_lseg(pgio->pg_lseg);
2667	pgio->pg_lseg = NULL;
2668}
2669EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2670
2671/*
2672 * Check for any intersection between the request and the pgio->pg_lseg,
2673 * and if none, put this pgio->pg_lseg away.
2674 */
2675void
2676pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2677{
2678	if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2679		pnfs_put_lseg(pgio->pg_lseg);
2680		pgio->pg_lseg = NULL;
2681	}
2682}
2683EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_range);
2684
2685void
2686pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2687{
2688	u64 rd_size;
2689
2690	pnfs_generic_pg_check_layout(pgio);
2691	pnfs_generic_pg_check_range(pgio, req);
2692	if (pgio->pg_lseg == NULL) {
2693		if (pgio->pg_dreq == NULL)
2694			rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2695		else
2696			rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2697
2698		pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2699						   nfs_req_openctx(req),
2700						   req_offset(req),
2701						   rd_size,
2702						   IOMODE_READ,
2703						   false,
2704						   GFP_KERNEL);
2705		if (IS_ERR(pgio->pg_lseg)) {
2706			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2707			pgio->pg_lseg = NULL;
2708			return;
2709		}
2710	}
2711	/* If no lseg, fall back to read through mds */
2712	if (pgio->pg_lseg == NULL)
2713		nfs_pageio_reset_read_mds(pgio);
2714
2715}
2716EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2717
2718void
2719pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2720			   struct nfs_page *req, u64 wb_size)
2721{
2722	pnfs_generic_pg_check_layout(pgio);
2723	pnfs_generic_pg_check_range(pgio, req);
2724	if (pgio->pg_lseg == NULL) {
2725		pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2726						   nfs_req_openctx(req),
2727						   req_offset(req),
2728						   wb_size,
2729						   IOMODE_RW,
2730						   false,
2731						   GFP_KERNEL);
2732		if (IS_ERR(pgio->pg_lseg)) {
2733			pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2734			pgio->pg_lseg = NULL;
2735			return;
2736		}
2737	}
2738	/* If no lseg, fall back to write through mds */
2739	if (pgio->pg_lseg == NULL)
2740		nfs_pageio_reset_write_mds(pgio);
2741}
2742EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2743
2744void
2745pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2746{
2747	if (desc->pg_lseg) {
2748		pnfs_put_lseg(desc->pg_lseg);
2749		desc->pg_lseg = NULL;
2750	}
2751}
2752EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2753
2754/*
2755 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2756 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2757 */
2758size_t
2759pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2760		     struct nfs_page *prev, struct nfs_page *req)
2761{
2762	unsigned int size;
2763	u64 seg_end, req_start, seg_left;
2764
2765	size = nfs_generic_pg_test(pgio, prev, req);
2766	if (!size)
2767		return 0;
2768
2769	/*
2770	 * 'size' contains the number of bytes left in the current page (up
2771	 * to the original size asked for in @req->wb_bytes).
2772	 *
2773	 * Calculate how many bytes are left in the layout segment
2774	 * and if there are less bytes than 'size', return that instead.
2775	 *
2776	 * Please also note that 'end_offset' is actually the offset of the
2777	 * first byte that lies outside the pnfs_layout_range. FIXME?
2778	 *
2779	 */
2780	if (pgio->pg_lseg) {
2781		seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2782				     pgio->pg_lseg->pls_range.length);
2783		req_start = req_offset(req);
2784
2785		/* start of request is past the last byte of this segment */
2786		if (req_start >= seg_end)
2787			return 0;
2788
2789		/* adjust 'size' iff there are fewer bytes left in the
2790		 * segment than what nfs_generic_pg_test returned */
2791		seg_left = seg_end - req_start;
2792		if (seg_left < size)
2793			size = (unsigned int)seg_left;
2794	}
2795
2796	return size;
2797}
2798EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2799
2800int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2801{
2802	struct nfs_pageio_descriptor pgio;
2803
2804	/* Resend all requests through the MDS */
2805	nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2806			      hdr->completion_ops);
2807	set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2808	return nfs_pageio_resend(&pgio, hdr);
2809}
2810EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2811
2812static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2813{
2814
2815	dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2816	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2817	    PNFS_LAYOUTRET_ON_ERROR) {
2818		pnfs_return_layout(hdr->inode);
2819	}
2820	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2821		hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2822}
2823
2824/*
2825 * Called by non rpc-based layout drivers
2826 */
2827void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2828{
2829	if (likely(!hdr->pnfs_error)) {
2830		pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2831				hdr->mds_offset + hdr->res.count);
2832		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2833	}
2834	trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2835	if (unlikely(hdr->pnfs_error))
2836		pnfs_ld_handle_write_error(hdr);
2837	hdr->mds_ops->rpc_release(hdr);
2838}
2839EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2840
2841static void
2842pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2843		struct nfs_pgio_header *hdr)
2844{
2845	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2846
2847	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2848		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2849		nfs_pageio_reset_write_mds(desc);
2850		mirror->pg_recoalesce = 1;
2851	}
2852	hdr->completion_ops->completion(hdr);
2853}
2854
2855static enum pnfs_try_status
2856pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2857			const struct rpc_call_ops *call_ops,
2858			struct pnfs_layout_segment *lseg,
2859			int how)
2860{
2861	struct inode *inode = hdr->inode;
2862	enum pnfs_try_status trypnfs;
2863	struct nfs_server *nfss = NFS_SERVER(inode);
2864
2865	hdr->mds_ops = call_ops;
2866
2867	dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2868		inode->i_ino, hdr->args.count, hdr->args.offset, how);
2869	trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2870	if (trypnfs != PNFS_NOT_ATTEMPTED)
2871		nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2872	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2873	return trypnfs;
2874}
2875
2876static void
2877pnfs_do_write(struct nfs_pageio_descriptor *desc,
2878	      struct nfs_pgio_header *hdr, int how)
2879{
2880	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2881	struct pnfs_layout_segment *lseg = desc->pg_lseg;
2882	enum pnfs_try_status trypnfs;
2883
2884	trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2885	switch (trypnfs) {
2886	case PNFS_NOT_ATTEMPTED:
2887		pnfs_write_through_mds(desc, hdr);
2888		break;
2889	case PNFS_ATTEMPTED:
2890		break;
2891	case PNFS_TRY_AGAIN:
2892		/* cleanup hdr and prepare to redo pnfs */
2893		if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2894			struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2895			list_splice_init(&hdr->pages, &mirror->pg_list);
2896			mirror->pg_recoalesce = 1;
2897		}
2898		hdr->mds_ops->rpc_release(hdr);
2899	}
2900}
2901
2902static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2903{
2904	pnfs_put_lseg(hdr->lseg);
2905	nfs_pgio_header_free(hdr);
2906}
2907
2908int
2909pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2910{
2911	struct nfs_pgio_header *hdr;
2912	int ret;
2913
2914	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2915	if (!hdr) {
2916		desc->pg_error = -ENOMEM;
2917		return desc->pg_error;
2918	}
2919	nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2920
2921	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2922	ret = nfs_generic_pgio(desc, hdr);
2923	if (!ret)
2924		pnfs_do_write(desc, hdr, desc->pg_ioflags);
2925
2926	return ret;
2927}
2928EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2929
2930int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2931{
2932	struct nfs_pageio_descriptor pgio;
2933
2934	/* Resend all requests through the MDS */
2935	nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2936	return nfs_pageio_resend(&pgio, hdr);
2937}
2938EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2939
2940static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2941{
2942	dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2943	if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2944	    PNFS_LAYOUTRET_ON_ERROR) {
2945		pnfs_return_layout(hdr->inode);
2946	}
2947	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2948		hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2949}
2950
2951/*
2952 * Called by non rpc-based layout drivers
2953 */
2954void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2955{
2956	if (likely(!hdr->pnfs_error))
2957		hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2958	trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2959	if (unlikely(hdr->pnfs_error))
2960		pnfs_ld_handle_read_error(hdr);
2961	hdr->mds_ops->rpc_release(hdr);
2962}
2963EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2964
2965static void
2966pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2967		struct nfs_pgio_header *hdr)
2968{
2969	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2970
2971	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2972		list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2973		nfs_pageio_reset_read_mds(desc);
2974		mirror->pg_recoalesce = 1;
2975	}
2976	hdr->completion_ops->completion(hdr);
2977}
2978
2979/*
2980 * Call the appropriate parallel I/O subsystem read function.
2981 */
2982static enum pnfs_try_status
2983pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2984		       const struct rpc_call_ops *call_ops,
2985		       struct pnfs_layout_segment *lseg)
2986{
2987	struct inode *inode = hdr->inode;
2988	struct nfs_server *nfss = NFS_SERVER(inode);
2989	enum pnfs_try_status trypnfs;
2990
2991	hdr->mds_ops = call_ops;
2992
2993	dprintk("%s: Reading ino:%lu %u@%llu\n",
2994		__func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2995
2996	trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2997	if (trypnfs != PNFS_NOT_ATTEMPTED)
2998		nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2999	dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
3000	return trypnfs;
3001}
3002
3003/* Resend all requests through pnfs. */
3004void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr,
3005			   unsigned int mirror_idx)
3006{
3007	struct nfs_pageio_descriptor pgio;
3008
3009	if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3010		/* Prevent deadlocks with layoutreturn! */
3011		pnfs_put_lseg(hdr->lseg);
3012		hdr->lseg = NULL;
3013
3014		nfs_pageio_init_read(&pgio, hdr->inode, false,
3015					hdr->completion_ops);
3016		pgio.pg_mirror_idx = mirror_idx;
3017		hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
3018	}
3019}
3020EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
3021
3022static void
3023pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
3024{
3025	const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
3026	struct pnfs_layout_segment *lseg = desc->pg_lseg;
3027	enum pnfs_try_status trypnfs;
3028
3029	trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
3030	switch (trypnfs) {
3031	case PNFS_NOT_ATTEMPTED:
3032		pnfs_read_through_mds(desc, hdr);
3033		break;
3034	case PNFS_ATTEMPTED:
3035		break;
3036	case PNFS_TRY_AGAIN:
3037		/* cleanup hdr and prepare to redo pnfs */
3038		if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3039			struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
3040			list_splice_init(&hdr->pages, &mirror->pg_list);
3041			mirror->pg_recoalesce = 1;
3042		}
3043		hdr->mds_ops->rpc_release(hdr);
3044	}
3045}
3046
3047static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
3048{
3049	pnfs_put_lseg(hdr->lseg);
3050	nfs_pgio_header_free(hdr);
3051}
3052
3053int
3054pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
3055{
3056	struct nfs_pgio_header *hdr;
3057	int ret;
3058
3059	hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
3060	if (!hdr) {
3061		desc->pg_error = -ENOMEM;
3062		return desc->pg_error;
3063	}
3064	nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
3065	hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
3066	ret = nfs_generic_pgio(desc, hdr);
3067	if (!ret)
3068		pnfs_do_read(desc, hdr);
3069	return ret;
3070}
3071EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
3072
3073static void pnfs_clear_layoutcommitting(struct inode *inode)
3074{
3075	unsigned long *bitlock = &NFS_I(inode)->flags;
3076
3077	clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
3078	smp_mb__after_atomic();
3079	wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
3080}
3081
3082/*
3083 * There can be multiple RW segments.
3084 */
3085static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
3086{
3087	struct pnfs_layout_segment *lseg;
3088
3089	list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
3090		if (lseg->pls_range.iomode == IOMODE_RW &&
3091		    test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
3092			list_add(&lseg->pls_lc_list, listp);
3093	}
3094}
3095
3096static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
3097{
3098	struct pnfs_layout_segment *lseg, *tmp;
3099
3100	/* Matched by references in pnfs_set_layoutcommit */
3101	list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
3102		list_del_init(&lseg->pls_lc_list);
3103		pnfs_put_lseg(lseg);
3104	}
3105
3106	pnfs_clear_layoutcommitting(inode);
3107}
3108
3109void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
3110{
3111	pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
3112}
3113EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
3114
3115void
3116pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
3117		loff_t end_pos)
3118{
3119	struct nfs_inode *nfsi = NFS_I(inode);
3120	bool mark_as_dirty = false;
3121
3122	spin_lock(&inode->i_lock);
3123	if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
3124		nfsi->layout->plh_lwb = end_pos;
3125		mark_as_dirty = true;
3126		dprintk("%s: Set layoutcommit for inode %lu ",
3127			__func__, inode->i_ino);
3128	} else if (end_pos > nfsi->layout->plh_lwb)
3129		nfsi->layout->plh_lwb = end_pos;
3130	if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
3131		/* references matched in nfs4_layoutcommit_release */
3132		pnfs_get_lseg(lseg);
3133	}
3134	spin_unlock(&inode->i_lock);
3135	dprintk("%s: lseg %p end_pos %llu\n",
3136		__func__, lseg, nfsi->layout->plh_lwb);
3137
3138	/* if pnfs_layoutcommit_inode() runs between inode locks, the next one
3139	 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
3140	if (mark_as_dirty)
3141		mark_inode_dirty_sync(inode);
3142}
3143EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
3144
3145void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
3146{
3147	struct nfs_server *nfss = NFS_SERVER(data->args.inode);
3148
3149	if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
3150		nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
3151	pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
3152}
3153
3154/*
3155 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
3156 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
3157 * data to disk to allow the server to recover the data if it crashes.
3158 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
3159 * is off, and a COMMIT is sent to a data server, or
3160 * if WRITEs to a data server return NFS_DATA_SYNC.
3161 */
3162int
3163pnfs_layoutcommit_inode(struct inode *inode, bool sync)
3164{
3165	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3166	struct nfs4_layoutcommit_data *data;
3167	struct nfs_inode *nfsi = NFS_I(inode);
3168	loff_t end_pos;
3169	int status;
3170
3171	if (!pnfs_layoutcommit_outstanding(inode))
3172		return 0;
3173
3174	dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
3175
3176	status = -EAGAIN;
3177	if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
3178		if (!sync)
3179			goto out;
3180		status = wait_on_bit_lock_action(&nfsi->flags,
3181				NFS_INO_LAYOUTCOMMITTING,
3182				nfs_wait_bit_killable,
3183				TASK_KILLABLE);
3184		if (status)
3185			goto out;
3186	}
3187
3188	status = -ENOMEM;
3189	/* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
3190	data = kzalloc(sizeof(*data), GFP_NOFS);
3191	if (!data)
3192		goto clear_layoutcommitting;
3193
3194	status = 0;
3195	spin_lock(&inode->i_lock);
3196	if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
3197		goto out_unlock;
3198
3199	INIT_LIST_HEAD(&data->lseg_list);
3200	pnfs_list_write_lseg(inode, &data->lseg_list);
3201
3202	end_pos = nfsi->layout->plh_lwb;
3203
3204	nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
3205	data->cred = get_cred(nfsi->layout->plh_lc_cred);
3206	spin_unlock(&inode->i_lock);
3207
3208	data->args.inode = inode;
 
3209	nfs_fattr_init(&data->fattr);
3210	data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3211	data->res.fattr = &data->fattr;
3212	if (end_pos != 0)
3213		data->args.lastbytewritten = end_pos - 1;
3214	else
3215		data->args.lastbytewritten = U64_MAX;
3216	data->res.server = NFS_SERVER(inode);
3217
3218	if (ld->prepare_layoutcommit) {
3219		status = ld->prepare_layoutcommit(&data->args);
3220		if (status) {
3221			put_cred(data->cred);
3222			spin_lock(&inode->i_lock);
3223			set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
3224			if (end_pos > nfsi->layout->plh_lwb)
3225				nfsi->layout->plh_lwb = end_pos;
3226			goto out_unlock;
3227		}
3228	}
3229
3230
3231	status = nfs4_proc_layoutcommit(data, sync);
3232out:
3233	if (status)
3234		mark_inode_dirty_sync(inode);
3235	dprintk("<-- %s status %d\n", __func__, status);
3236	return status;
3237out_unlock:
3238	spin_unlock(&inode->i_lock);
3239	kfree(data);
3240clear_layoutcommitting:
3241	pnfs_clear_layoutcommitting(inode);
3242	goto out;
3243}
3244EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
3245
3246int
3247pnfs_generic_sync(struct inode *inode, bool datasync)
3248{
3249	return pnfs_layoutcommit_inode(inode, true);
3250}
3251EXPORT_SYMBOL_GPL(pnfs_generic_sync);
3252
3253struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
3254{
3255	struct nfs4_threshold *thp;
3256
3257	thp = kzalloc(sizeof(*thp), GFP_NOFS);
3258	if (!thp) {
3259		dprintk("%s mdsthreshold allocation failed\n", __func__);
3260		return NULL;
3261	}
3262	return thp;
3263}
3264
3265#if IS_ENABLED(CONFIG_NFS_V4_2)
3266int
3267pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
3268{
3269	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3270	struct nfs_server *server = NFS_SERVER(inode);
3271	struct nfs_inode *nfsi = NFS_I(inode);
3272	struct nfs42_layoutstat_data *data;
3273	struct pnfs_layout_hdr *hdr;
3274	int status = 0;
3275
3276	if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
3277		goto out;
3278
3279	if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
3280		goto out;
3281
3282	if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
3283		goto out;
3284
3285	spin_lock(&inode->i_lock);
3286	if (!NFS_I(inode)->layout) {
3287		spin_unlock(&inode->i_lock);
3288		goto out_clear_layoutstats;
3289	}
3290	hdr = NFS_I(inode)->layout;
3291	pnfs_get_layout_hdr(hdr);
3292	spin_unlock(&inode->i_lock);
3293
3294	data = kzalloc(sizeof(*data), gfp_flags);
3295	if (!data) {
3296		status = -ENOMEM;
3297		goto out_put;
3298	}
3299
3300	data->args.fh = NFS_FH(inode);
3301	data->args.inode = inode;
3302	status = ld->prepare_layoutstats(&data->args);
3303	if (status)
3304		goto out_free;
3305
3306	status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3307
3308out:
3309	dprintk("%s returns %d\n", __func__, status);
3310	return status;
3311
3312out_free:
3313	kfree(data);
3314out_put:
3315	pnfs_put_layout_hdr(hdr);
3316out_clear_layoutstats:
3317	smp_mb__before_atomic();
3318	clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3319	smp_mb__after_atomic();
3320	goto out;
3321}
3322EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
3323#endif
3324
3325unsigned int layoutstats_timer;
3326module_param(layoutstats_timer, uint, 0644);
3327EXPORT_SYMBOL_GPL(layoutstats_timer);