summaryrefslogtreecommitdiff
path: root/fs/nfs/pnfs.h
blob: db57a85500ee70f07347f8de647ddca341f4b1ac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
/*
 *  pNFS client data structures.
 *
 *  Copyright (c) 2002
 *  The Regents of the University of Michigan
 *  All Rights Reserved
 *
 *  Dean Hildebrand <dhildebz@umich.edu>
 *
 *  Permission is granted to use, copy, create derivative works, and
 *  redistribute this software and such derivative works for any purpose,
 *  so long as the name of the University of Michigan is not used in
 *  any advertising or publicity pertaining to the use or distribution
 *  of this software without specific, written prior authorization. If
 *  the above copyright notice or any other identification of the
 *  University of Michigan is included in any copy of any portion of
 *  this software, then the disclaimer below must also be included.
 *
 *  This software is provided as is, without representation or warranty
 *  of any kind either express or implied, including without limitation
 *  the implied warranties of merchantability, fitness for a particular
 *  purpose, or noninfringement.  The Regents of the University of
 *  Michigan shall not be liable for any damages, including special,
 *  indirect, incidental, or consequential damages, with respect to any
 *  claim arising out of or in connection with the use of the software,
 *  even if it has been or is hereafter advised of the possibility of
 *  such damages.
 */

#ifndef FS_NFS_PNFS_H
#define FS_NFS_PNFS_H

#include <linux/refcount.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/workqueue.h>

struct nfs4_exception;
struct nfs4_opendata;

enum {
	NFS_LSEG_VALID = 0,	/* cleared when lseg is recalled/returned */
	NFS_LSEG_ROC,		/* roc bit received from server */
	NFS_LSEG_LAYOUTCOMMIT,	/* layoutcommit bit set for layoutcommit */
	NFS_LSEG_LAYOUTRETURN,	/* layoutreturn bit set for layoutreturn */
	NFS_LSEG_UNAVAILABLE,	/* unavailable bit set for temporary problem */
};

/* Individual ip address */
struct nfs4_pnfs_ds_addr {
	struct sockaddr_storage	da_addr;
	size_t			da_addrlen;
	struct list_head	da_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
	char			*da_remotestr;	/* human readable addr+port */
	const char		*da_netid;
	int			da_transport;
};

struct nfs4_pnfs_ds {
	struct list_head	ds_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
	char			*ds_remotestr;	/* comma sep list of addrs */
	struct list_head	ds_addrs;
	struct nfs_client	*ds_clp;
	refcount_t		ds_count;
	unsigned long		ds_state;
#define NFS4DS_CONNECTING	0	/* ds is establishing connection */
};

struct pnfs_layout_segment {
	struct list_head pls_list;
	struct list_head pls_lc_list;
	struct list_head pls_commits;
	struct pnfs_layout_range pls_range;
	refcount_t pls_refcount;
	u32 pls_seq;
	unsigned long pls_flags;
	struct pnfs_layout_hdr *pls_layout;
};

enum pnfs_try_status {
	PNFS_ATTEMPTED     = 0,
	PNFS_NOT_ATTEMPTED = 1,
	PNFS_TRY_AGAIN     = 2,
};

#ifdef CONFIG_NFS_V4_1

#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"

/*
 * Default data server connection timeout and retrans vaules.
 * Set by module parameters dataserver_timeo and dataserver_retrans.
 */
#define NFS4_DEF_DS_TIMEO   600 /* in tenths of a second */
#define NFS4_DEF_DS_RETRANS 5
#define PNFS_DEVICE_RETRY_TIMEOUT (120*HZ)

enum {
	NFS_LAYOUT_RO_FAILED = 0,	/* get ro layout failed stop trying */
	NFS_LAYOUT_RW_FAILED,		/* get rw layout failed stop trying */
	NFS_LAYOUT_BULK_RECALL,		/* bulk recall affecting layout */
	NFS_LAYOUT_RETURN,		/* layoutreturn in progress */
	NFS_LAYOUT_RETURN_LOCK,		/* Serialise layoutreturn */
	NFS_LAYOUT_RETURN_REQUESTED,	/* Return this layout ASAP */
	NFS_LAYOUT_INVALID_STID,	/* layout stateid id is invalid */
	NFS_LAYOUT_FIRST_LAYOUTGET,	/* Serialize first layoutget */
	NFS_LAYOUT_INODE_FREEING,	/* The inode is being freed */
	NFS_LAYOUT_HASHED,		/* The layout visible */
	NFS_LAYOUT_DRAIN,
};

enum layoutdriver_policy_flags {
	/* Should the pNFS client commit and return the layout upon truncate to
	 * a smaller size */
	PNFS_LAYOUTRET_ON_SETATTR	= 1 << 0,
	PNFS_LAYOUTRET_ON_ERROR		= 1 << 1,
	PNFS_READ_WHOLE_PAGE		= 1 << 2,
	PNFS_LAYOUTGET_ON_OPEN		= 1 << 3,
};

struct nfs4_deviceid_node;

/* Per-layout driver specific registration structure */
struct pnfs_layoutdriver_type {
	struct list_head pnfs_tblid;
	const u32 id;
	const char *name;
	struct module *owner;
	unsigned flags;
	unsigned max_deviceinfo_size;
	unsigned max_layoutget_response;

	int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
	int (*clear_layoutdriver) (struct nfs_server *);

	struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
	void (*free_layout_hdr) (struct pnfs_layout_hdr *);

	struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
	void (*free_lseg) (struct pnfs_layout_segment *lseg);
	void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
			struct pnfs_layout_segment *lseg,
			struct list_head *free_me);

	void (*return_range) (struct pnfs_layout_hdr *lo,
			      struct pnfs_layout_range *range);

	/* test for nfs page cache coalescing */
	const struct nfs_pageio_ops *pg_read_ops;
	const struct nfs_pageio_ops *pg_write_ops;

	struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);

	int (*sync)(struct inode *inode, bool datasync);

	/*
	 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
	 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
	 */
	enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
	enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);

	void (*free_deviceid_node) (struct nfs4_deviceid_node *);
	struct nfs4_deviceid_node * (*alloc_deviceid_node)
			(struct nfs_server *server, struct pnfs_device *pdev,
			gfp_t gfp_flags);

	int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *);

	void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
	int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
	int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);

	void (*cancel_io)(struct pnfs_layout_segment *lseg);
};

struct pnfs_commit_ops {
	void (*setup_ds_info)(struct pnfs_ds_commit_info *,
			      struct pnfs_layout_segment *);
	void (*release_ds_info)(struct pnfs_ds_commit_info *,
				struct inode *inode);
	int (*commit_pagelist)(struct inode *inode,
			       struct list_head *mds_pages,
			       int how,
			       struct nfs_commit_info *cinfo);
	void (*mark_request_commit) (struct nfs_page *req,
				     struct pnfs_layout_segment *lseg,
				     struct nfs_commit_info *cinfo,
				     u32 ds_commit_idx);
	void (*clear_request_commit) (struct nfs_page *req,
				      struct nfs_commit_info *cinfo);
	int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
				  int max);
	void (*recover_commit_reqs) (struct list_head *list,
				     struct nfs_commit_info *cinfo);
	struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
						struct folio *folio);
};

struct pnfs_layout_hdr {
	refcount_t		plh_refcount;
	atomic_t		plh_outstanding; /* number of RPCs out */
	struct list_head	plh_layouts;   /* other client layouts */
	struct list_head	plh_bulk_destroy;
	struct list_head	plh_segs;      /* layout segments list */
	struct list_head	plh_return_segs; /* invalid layout segments */
	unsigned long		plh_block_lgets; /* block LAYOUTGET if >0 */
	unsigned long		plh_retry_timestamp;
	unsigned long		plh_flags;
	nfs4_stateid		plh_stateid;
	u32			plh_barrier; /* ignore lower seqids */
	u32			plh_return_seq;
	enum pnfs_iomode	plh_return_iomode;
	loff_t			plh_lwb; /* last write byte for layoutcommit */
	const struct cred	*plh_lc_cred; /* layoutcommit cred */
	struct inode		*plh_inode;
	struct rcu_head		plh_rcu;
};

struct pnfs_device {
	struct nfs4_deviceid dev_id;
	unsigned int  layout_type;
	unsigned int  mincount;
	unsigned int  maxcount;	/* gdia_maxcount */
	struct page **pages;
	unsigned int  pgbase;
	unsigned int  pglen;	/* reply buffer length */
	unsigned char nocache : 1;/* May not be cached */
};

#define NFS4_PNFS_GETDEVLIST_MAXNUM 16

struct pnfs_devicelist {
	unsigned int		eof;
	unsigned int		num_devs;
	struct nfs4_deviceid	dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
};

extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
extern const struct pnfs_layoutdriver_type *pnfs_find_layoutdriver(u32 id);
extern void pnfs_put_layoutdriver(const struct pnfs_layoutdriver_type *ld);

/* nfs4proc.c */
extern size_t max_response_pages(struct nfs_server *server);
extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
				   struct pnfs_device *dev,
				   const struct cred *cred);
extern struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
		    struct nfs4_exception *exception);
extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);

/* pnfs.c */
void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
void pnfs_put_lseg(struct pnfs_layout_segment *lseg);

void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
void unset_pnfs_layoutdriver(struct nfs_server *);
void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
void pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req);
void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
			        struct nfs_page *req, u64 wb_size);
void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
			    struct nfs_page *prev, struct nfs_page *req);
void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
void pnfs_layoutget_free(struct nfs4_layoutget *lgp);
void pnfs_free_lseg_list(struct list_head *tmp_list);
void pnfs_destroy_layout(struct nfs_inode *);
void pnfs_destroy_layout_final(struct nfs_inode *);
void pnfs_destroy_all_layouts(struct nfs_client *);
int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
		struct nfs_fsid *fsid,
		bool is_recall);
int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
		bool is_recall);
bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
		struct pnfs_layout_range *dst_range,
		struct inode *inode);
void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
			     const nfs4_stateid *new,
			     const struct cred *cred,
			     bool update_barrier);
int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
				struct list_head *tmp_list,
				const struct pnfs_layout_range *recall_range,
				u32 seq);
int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
				struct list_head *tmp_list,
				const struct pnfs_layout_range *recall_range,
				u32 seq);
int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
		struct list_head *lseg_list);
bool pnfs_roc(struct inode *ino,
		struct nfs4_layoutreturn_args *args,
		struct nfs4_layoutreturn_res *res,
		const struct cred *cred);
int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp,
		  struct nfs4_layoutreturn_res **respp, int *ret);
void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
		struct nfs4_layoutreturn_res *res,
		int ret);
bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
int pnfs_generic_sync(struct inode *inode, bool datasync);
int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
int _pnfs_return_layout(struct inode *);
int pnfs_commit_and_return_layout(struct inode *);
void pnfs_ld_write_done(struct nfs_pgio_header *);
void pnfs_ld_read_done(struct nfs_pgio_header *);
void pnfs_read_resend_pnfs(struct nfs_pgio_header *, unsigned int mirror_idx);
struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
					       struct nfs_open_context *ctx,
					       loff_t pos,
					       u64 count,
					       enum pnfs_iomode iomode,
					       bool strict_iomode,
					       gfp_t gfp_flags);
void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
		const nfs4_stateid *arg_stateid,
		const struct pnfs_layout_range *range,
		const nfs4_stateid *stateid);

void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
		   struct pnfs_layout_segment *lseg,
		   bool (*is_after)(const struct pnfs_layout_range *lseg_range,
			   const struct pnfs_layout_range *old),
		   bool (*do_merge)(struct pnfs_layout_segment *lseg,
			   struct pnfs_layout_segment *old),
		   struct list_head *free_me);

void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
void pnfs_error_mark_layout_for_return(struct inode *inode,
				       struct pnfs_layout_segment *lseg);
void pnfs_layout_return_unused_byclid(struct nfs_client *clp,
				      enum pnfs_iomode iomode);

/* nfs4_deviceid_flags */
enum {
	NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
	NFS_DEVICEID_UNAVAILABLE,	/* device temporarily unavailable */
	NFS_DEVICEID_NOCACHE,		/* device may not be cached */
};

/* pnfs_dev.c */
struct nfs4_deviceid_node {
	struct hlist_node		node;
	struct hlist_node		tmpnode;
	const struct pnfs_layoutdriver_type *ld;
	const struct nfs_client		*nfs_client;
	unsigned long 			flags;
	unsigned long			timestamp_unavailable;
	struct nfs4_deviceid		deviceid;
	struct rcu_head			rcu;
	atomic_t			ref;
};

struct nfs4_deviceid_node *
nfs4_find_get_deviceid(struct nfs_server *server,
		const struct nfs4_deviceid *id, const struct cred *cred,
		gfp_t gfp_mask);
void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
			     const struct nfs4_deviceid *);
bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
void nfs4_mark_deviceid_available(struct nfs4_deviceid_node *node);
void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
void nfs4_deviceid_purge_client(const struct nfs_client *);

/* pnfs_nfs.c */
struct pnfs_commit_array *pnfs_alloc_commit_array(size_t n, gfp_t gfp_flags);
void pnfs_free_commit_array(struct pnfs_commit_array *p);
struct pnfs_commit_array *pnfs_add_commit_array(struct pnfs_ds_commit_info *,
						struct pnfs_commit_array *,
						struct pnfs_layout_segment *);

void pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo,
		struct pnfs_layout_segment *lseg);
void pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo);

void pnfs_generic_clear_request_commit(struct nfs_page *req,
				       struct nfs_commit_info *cinfo);
void pnfs_generic_commit_release(void *calldata);
void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
void pnfs_generic_rw_release(void *data);
void pnfs_generic_recover_commit_reqs(struct list_head *dst,
				      struct nfs_commit_info *cinfo);
struct nfs_page *pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo,
						 struct folio *folio);
int pnfs_generic_commit_pagelist(struct inode *inode,
				 struct list_head *mds_pages,
				 int how,
				 struct nfs_commit_info *cinfo,
				 int (*initiate_commit)(struct nfs_commit_data *data,
							int how));
int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
				      gfp_t gfp_flags);
void nfs4_pnfs_v3_ds_connect_unload(void);
int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
			  struct nfs4_deviceid_node *devid, unsigned int timeo,
			  unsigned int retrans, u32 version, u32 minor_version);
struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
						 struct xdr_stream *xdr,
						 gfp_t gfp_flags);
void pnfs_layout_mark_request_commit(struct nfs_page *req,
				     struct pnfs_layout_segment *lseg,
				     struct nfs_commit_info *cinfo,
				     u32 ds_commit_idx);
void pnfs_lgopen_prepare(struct nfs4_opendata *data,
			 struct nfs_open_context *ctx);
void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
		       struct nfs_open_context *ctx);
void nfs4_lgopen_release(struct nfs4_layoutget *lgp);

static inline bool nfs_have_layout(struct inode *inode)
{
	return NFS_I(inode)->layout != NULL;
}

static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
{
	return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
}

static inline struct nfs4_deviceid_node *
nfs4_get_deviceid(struct nfs4_deviceid_node *d)
{
	atomic_inc(&d->ref);
	return d;
}

static inline struct pnfs_layout_segment *
pnfs_get_lseg(struct pnfs_layout_segment *lseg)
{
	if (lseg) {
		refcount_inc(&lseg->pls_refcount);
		smp_mb__after_atomic();
	}
	return lseg;
}

static inline bool
pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
{
	return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
}

/* Return true if a layout driver is being used for this mountpoint */
static inline int pnfs_enabled_sb(struct nfs_server *nfss)
{
	return nfss->pnfs_curr_ld != NULL;
}

static inline int
pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
		 struct nfs_commit_info *cinfo)
{
	struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;

	if (fl_cinfo == NULL || fl_cinfo->ncommitting == 0)
		return PNFS_NOT_ATTEMPTED;
	return fl_cinfo->ops->commit_pagelist(inode, mds_pages, how, cinfo);
}

static inline struct pnfs_ds_commit_info *
pnfs_get_ds_info(struct inode *inode)
{
	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;

	if (ld == NULL || ld->get_ds_info == NULL)
		return NULL;
	return ld->get_ds_info(inode);
}

static inline void
pnfs_init_ds_commit_info_ops(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
{
	struct pnfs_ds_commit_info *inode_cinfo = pnfs_get_ds_info(inode);
	if (inode_cinfo != NULL)
		fl_cinfo->ops = inode_cinfo->ops;
}

static inline void
pnfs_init_ds_commit_info(struct pnfs_ds_commit_info *fl_cinfo)
{
	INIT_LIST_HEAD(&fl_cinfo->commits);
	fl_cinfo->ops = NULL;
}

static inline void
pnfs_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
{
	if (fl_cinfo->ops != NULL && fl_cinfo->ops->release_ds_info != NULL)
		fl_cinfo->ops->release_ds_info(fl_cinfo, inode);
}

static inline void
pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
{
	set_bit(NFS_DEVICEID_INVALID, &node->flags);
}

static inline bool
pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
			 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
{
	struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;

	if (!lseg || !fl_cinfo->ops || !fl_cinfo->ops->mark_request_commit)
		return false;
	fl_cinfo->ops->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
	return true;
}

static inline bool
pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
{
	struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;

	if (!fl_cinfo || !fl_cinfo->ops || !fl_cinfo->ops->clear_request_commit)
		return false;
	fl_cinfo->ops->clear_request_commit(req, cinfo);
	return true;
}

static inline int
pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
		       int max)
{
	struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;

	if (!fl_cinfo || fl_cinfo->nwritten == 0)
		return 0;
	return fl_cinfo->ops->scan_commit_lists(cinfo, max);
}

static inline void
pnfs_recover_commit_reqs(struct list_head *head, struct nfs_commit_info *cinfo)
{
	struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;

	if (fl_cinfo && fl_cinfo->nwritten != 0)
		fl_cinfo->ops->recover_commit_reqs(head, cinfo);
}

static inline struct nfs_page *
pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
			struct folio *folio)
{
	struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;

	if (!fl_cinfo->ops || !fl_cinfo->ops->search_commit_reqs)
		return NULL;
	return fl_cinfo->ops->search_commit_reqs(cinfo, folio);
}

/* Should the pNFS client commit and return the layout upon a setattr */
static inline bool
pnfs_ld_layoutret_on_setattr(struct inode *inode)
{
	if (!pnfs_enabled_sb(NFS_SERVER(inode)))
		return false;
	return NFS_SERVER(inode)->pnfs_curr_ld->flags &
		PNFS_LAYOUTRET_ON_SETATTR;
}

static inline bool
pnfs_ld_read_whole_page(struct inode *inode)
{
	if (!pnfs_enabled_sb(NFS_SERVER(inode)))
		return false;
	return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
}

static inline int
pnfs_sync_inode(struct inode *inode, bool datasync)
{
	if (!pnfs_enabled_sb(NFS_SERVER(inode)))
		return 0;
	return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
}

static inline bool
pnfs_layoutcommit_outstanding(struct inode *inode)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
		test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
}

static inline int pnfs_return_layout(struct inode *ino)
{
	struct nfs_inode *nfsi = NFS_I(ino);
	struct nfs_server *nfss = NFS_SERVER(ino);

	if (pnfs_enabled_sb(nfss) && nfsi->layout) {
		set_bit(NFS_LAYOUT_RETURN_REQUESTED, &nfsi->layout->plh_flags);
		return _pnfs_return_layout(ino);
	}

	return 0;
}

static inline bool
pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
		   struct nfs_server *nfss)
{
	return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
					nfss->pnfs_curr_ld->id == src->l_type);
}

static inline u64
pnfs_calc_offset_end(u64 offset, u64 len)
{
	if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
		return NFS4_MAX_UINT64;
	return offset + len - 1;
}

static inline u64
pnfs_calc_offset_length(u64 offset, u64 end)
{
	if (end == NFS4_MAX_UINT64 || end <= offset)
		return NFS4_MAX_UINT64;
	return 1 + end - offset;
}

static inline void
pnfs_copy_range(struct pnfs_layout_range *dst,
		const struct pnfs_layout_range *src)
{
	memcpy(dst, src, sizeof(*dst));
}

static inline u64
pnfs_end_offset(u64 start, u64 len)
{
	if (NFS4_MAX_UINT64 - start <= len)
		return NFS4_MAX_UINT64;
	return start + len;
}

/*
 * Are 2 ranges intersecting?
 *   start1                             end1
 *   [----------------------------------)
 *                                start2           end2
 *                                [----------------)
 */
static inline bool
pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
{
	return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
		(end2 == NFS4_MAX_UINT64 || start1 < end2);
}

static inline bool
pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
		const struct pnfs_layout_range *l2)
{
	u64 end1 = pnfs_end_offset(l1->offset, l1->length);
	u64 end2 = pnfs_end_offset(l2->offset, l2->length);

	return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
}

static inline bool
pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req)
{
	u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length);
	u64 req_last = req_offset(req) + req->wb_bytes;

	return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last,
				req_offset(req), req_last);
}

static inline void pnfs_lseg_cancel_io(struct nfs_server *server,
				       struct pnfs_layout_segment *lseg)
{
	if (server->pnfs_curr_ld->cancel_io)
		server->pnfs_curr_ld->cancel_io(lseg);
}

extern unsigned int layoutstats_timer;

#ifdef NFS_DEBUG
void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
#else
static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
{
}

#endif /* NFS_DEBUG */
#else  /* CONFIG_NFS_V4_1 */

static inline bool nfs_have_layout(struct inode *inode)
{
	return false;
}

static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
{
}

static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
{
}

static inline void pnfs_destroy_layout_final(struct nfs_inode *nfsi)
{
}

static inline struct pnfs_layout_segment *
pnfs_get_lseg(struct pnfs_layout_segment *lseg)
{
	return NULL;
}

static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
{
}

static inline int pnfs_return_layout(struct inode *ino)
{
	return 0;
}

static inline int pnfs_commit_and_return_layout(struct inode *inode)
{
	return 0;
}

static inline bool
pnfs_ld_layoutret_on_setattr(struct inode *inode)
{
	return false;
}

static inline bool
pnfs_ld_read_whole_page(struct inode *inode)
{
	return false;
}

static inline int
pnfs_sync_inode(struct inode *inode, bool datasync)
{
	return 0;
}

static inline bool
pnfs_layoutcommit_outstanding(struct inode *inode)
{
	return false;
}


static inline bool
pnfs_roc(struct inode *ino,
		struct nfs4_layoutreturn_args *args,
		struct nfs4_layoutreturn_res *res,
		const struct cred *cred)
{
	return false;
}

static inline int
pnfs_roc_done(struct rpc_task *task,
		struct nfs4_layoutreturn_args **argpp,
		struct nfs4_layoutreturn_res **respp,
		int *ret)
{
	return 0;
}

static inline void
pnfs_roc_release(struct nfs4_layoutreturn_args *args,
		struct nfs4_layoutreturn_res *res,
		int ret)
{
}

static inline bool
pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
{
	return false;
}

static inline void set_pnfs_layoutdriver(struct nfs_server *s,
					 const struct nfs_fh *mntfh,
					 struct nfs_fsinfo *fsinfo)
{
}

static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
{
}

static inline int
pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
		 struct nfs_commit_info *cinfo)
{
	return PNFS_NOT_ATTEMPTED;
}

static inline struct pnfs_ds_commit_info *
pnfs_get_ds_info(struct inode *inode)
{
	return NULL;
}

static inline void
pnfs_init_ds_commit_info_ops(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
{
}

static inline void
pnfs_init_ds_commit_info(struct pnfs_ds_commit_info *fl_cinfo)
{
}

static inline void
pnfs_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
{
}

static inline bool
pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
			 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
{
	return false;
}

static inline bool
pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
{
	return false;
}

static inline int
pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
		       int max)
{
	return 0;
}

static inline void
pnfs_recover_commit_reqs(struct list_head *head, struct nfs_commit_info *cinfo)
{
}

static inline struct nfs_page *
pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
			struct folio *folio)
{
	return NULL;
}

static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
{
	return 0;
}

static inline bool
pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
		   struct nfs_server *nfss)
{
	return false;
}

static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
{
	return NULL;
}

static inline void nfs4_pnfs_v3_ds_connect_unload(void)
{
}

static inline bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
		struct pnfs_layout_range *dst_range,
		struct inode *inode)
{
	return false;
}

static inline void pnfs_lgopen_prepare(struct nfs4_opendata *data,
		struct nfs_open_context *ctx)
{
}

static inline void pnfs_parse_lgopen(struct inode *ino,
		struct nfs4_layoutget *lgp,
		struct nfs_open_context *ctx)
{
}

static inline void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
{
}

static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
{
	return false;
}

#endif /* CONFIG_NFS_V4_1 */

#if IS_ENABLED(CONFIG_NFS_V4_2)
int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
#else
static inline int
pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
{
	return 0;
}
#endif

#endif /* FS_NFS_PNFS_H */