aboutsummaryrefslogtreecommitdiff
path: root/fs/orangefs/inode.c
blob: 5079cfafa8d7a938859348d157a8b366f605ac4c (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
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
// SPDX-License-Identifier: GPL-2.0
/*
 * (C) 2001 Clemson University and The University of Chicago
 * Copyright 2018 Omnibond Systems, L.L.C.
 *
 * See COPYING in top-level directory.
 */

/*
 *  Linux VFS inode operations.
 */

#include <linux/bvec.h>
#include "protocol.h"
#include "orangefs-kernel.h"
#include "orangefs-bufmap.h"

static int orangefs_writepage_locked(struct page *page,
    struct writeback_control *wbc)
{
	struct inode *inode = page->mapping->host;
	struct orangefs_write_range *wr = NULL;
	struct iov_iter iter;
	struct bio_vec bv;
	size_t len, wlen;
	ssize_t ret;
	loff_t off;

	set_page_writeback(page);

	len = i_size_read(inode);
	if (PagePrivate(page)) {
		wr = (struct orangefs_write_range *)page_private(page);
		WARN_ON(wr->pos >= len);
		off = wr->pos;
		if (off + wr->len > len)
			wlen = len - off;
		else
			wlen = wr->len;
	} else {
		WARN_ON(1);
		off = page_offset(page);
		if (off + PAGE_SIZE > len)
			wlen = len - off;
		else
			wlen = PAGE_SIZE;
	}
	/* Should've been handled in orangefs_invalidatepage. */
	WARN_ON(off == len || off + wlen > len);

	bv.bv_page = page;
	bv.bv_len = wlen;
	bv.bv_offset = off % PAGE_SIZE;
	WARN_ON(wlen == 0);
	iov_iter_bvec(&iter, WRITE, &bv, 1, wlen);

	ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, wlen,
	    len, wr, NULL, NULL);
	if (ret < 0) {
		SetPageError(page);
		mapping_set_error(page->mapping, ret);
	} else {
		ret = 0;
	}
	kfree(detach_page_private(page));
	return ret;
}

static int orangefs_writepage(struct page *page, struct writeback_control *wbc)
{
	int ret;
	ret = orangefs_writepage_locked(page, wbc);
	unlock_page(page);
	end_page_writeback(page);
	return ret;
}

struct orangefs_writepages {
	loff_t off;
	size_t len;
	kuid_t uid;
	kgid_t gid;
	int maxpages;
	int npages;
	struct page **pages;
	struct bio_vec *bv;
};

static int orangefs_writepages_work(struct orangefs_writepages *ow,
    struct writeback_control *wbc)
{
	struct inode *inode = ow->pages[0]->mapping->host;
	struct orangefs_write_range *wrp, wr;
	struct iov_iter iter;
	ssize_t ret;
	size_t len;
	loff_t off;
	int i;

	len = i_size_read(inode);

	for (i = 0; i < ow->npages; i++) {
		set_page_writeback(ow->pages[i]);
		ow->bv[i].bv_page = ow->pages[i];
		ow->bv[i].bv_len = min(page_offset(ow->pages[i]) + PAGE_SIZE,
		    ow->off + ow->len) -
		    max(ow->off, page_offset(ow->pages[i]));
		if (i == 0)
			ow->bv[i].bv_offset = ow->off -
			    page_offset(ow->pages[i]);
		else
			ow->bv[i].bv_offset = 0;
	}
	iov_iter_bvec(&iter, WRITE, ow->bv, ow->npages, ow->len);

	WARN_ON(ow->off >= len);
	if (ow->off + ow->len > len)
		ow->len = len - ow->off;

	off = ow->off;
	wr.uid = ow->uid;
	wr.gid = ow->gid;
	ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, ow->len,
	    0, &wr, NULL, NULL);
	if (ret < 0) {
		for (i = 0; i < ow->npages; i++) {
			SetPageError(ow->pages[i]);
			mapping_set_error(ow->pages[i]->mapping, ret);
			if (PagePrivate(ow->pages[i])) {
				wrp = (struct orangefs_write_range *)
				    page_private(ow->pages[i]);
				ClearPagePrivate(ow->pages[i]);
				put_page(ow->pages[i]);
				kfree(wrp);
			}
			end_page_writeback(ow->pages[i]);
			unlock_page(ow->pages[i]);
		}
	} else {
		ret = 0;
		for (i = 0; i < ow->npages; i++) {
			if (PagePrivate(ow->pages[i])) {
				wrp = (struct orangefs_write_range *)
				    page_private(ow->pages[i]);
				ClearPagePrivate(ow->pages[i]);
				put_page(ow->pages[i]);
				kfree(wrp);
			}
			end_page_writeback(ow->pages[i]);
			unlock_page(ow->pages[i]);
		}
	}
	return ret;
}

static int orangefs_writepages_callback(struct page *page,
    struct writeback_control *wbc, void *data)
{
	struct orangefs_writepages *ow = data;
	struct orangefs_write_range *wr;
	int ret;

	if (!PagePrivate(page)) {
		unlock_page(page);
		/* It's not private so there's nothing to write, right? */
		printk("writepages_callback not private!\n");
		BUG();
		return 0;
	}
	wr = (struct orangefs_write_range *)page_private(page);

	ret = -1;
	if (ow->npages == 0) {
		ow->off = wr->pos;
		ow->len = wr->len;
		ow->uid = wr->uid;
		ow->gid = wr->gid;
		ow->pages[ow->npages++] = page;
		ret = 0;
		goto done;
	}
	if (!uid_eq(ow->uid, wr->uid) || !gid_eq(ow->gid, wr->gid)) {
		orangefs_writepages_work(ow, wbc);
		ow->npages = 0;
		ret = -1;
		goto done;
	}
	if (ow->off + ow->len == wr->pos) {
		ow->len += wr->len;
		ow->pages[ow->npages++] = page;
		ret = 0;
		goto done;
	}
done:
	if (ret == -1) {
		if (ow->npages) {
			orangefs_writepages_work(ow, wbc);
			ow->npages = 0;
		}
		ret = orangefs_writepage_locked(page, wbc);
		mapping_set_error(page->mapping, ret);
		unlock_page(page);
		end_page_writeback(page);
	} else {
		if (ow->npages == ow->maxpages) {
			orangefs_writepages_work(ow, wbc);
			ow->npages = 0;
		}
	}
	return ret;
}

static int orangefs_writepages(struct address_space *mapping,
    struct writeback_control *wbc)
{
	struct orangefs_writepages *ow;
	struct blk_plug plug;
	int ret;
	ow = kzalloc(sizeof(struct orangefs_writepages), GFP_KERNEL);
	if (!ow)
		return -ENOMEM;
	ow->maxpages = orangefs_bufmap_size_query()/PAGE_SIZE;
	ow->pages = kcalloc(ow->maxpages, sizeof(struct page *), GFP_KERNEL);
	if (!ow->pages) {
		kfree(ow);
		return -ENOMEM;
	}
	ow->bv = kcalloc(ow->maxpages, sizeof(struct bio_vec), GFP_KERNEL);
	if (!ow->bv) {
		kfree(ow->pages);
		kfree(ow);
		return -ENOMEM;
	}
	blk_start_plug(&plug);
	ret = write_cache_pages(mapping, wbc, orangefs_writepages_callback, ow);
	if (ow->npages)
		ret = orangefs_writepages_work(ow, wbc);
	blk_finish_plug(&plug);
	kfree(ow->pages);
	kfree(ow->bv);
	kfree(ow);
	return ret;
}

static int orangefs_launder_page(struct page *);

static int orangefs_readpage(struct file *file, struct page *page)
{
	struct inode *inode = page->mapping->host;
	struct iov_iter iter;
	struct bio_vec bv;
	ssize_t ret;
	loff_t off; /* offset into this page */
	pgoff_t index; /* which page */
	struct page *next_page;
	char *kaddr;
	loff_t read_size;
	int buffer_index = -1; /* orangefs shared memory slot */
	int slot_index;   /* index into slot */
	int remaining;

	/*
	 * Get up to this many bytes from Orangefs at a time and try
	 * to fill them into the page cache at once. Tests with dd made
	 * this seem like a reasonable static number, if there was
	 * interest perhaps this number could be made setable through
	 * sysfs...
	 */
	read_size = 524288;

	if (PageDirty(page))
		orangefs_launder_page(page);

	off = page_offset(page);
	index = off >> PAGE_SHIFT;
	bv.bv_page = page;
	bv.bv_len = PAGE_SIZE;
	bv.bv_offset = 0;
	iov_iter_bvec(&iter, READ, &bv, 1, PAGE_SIZE);

	ret = wait_for_direct_io(ORANGEFS_IO_READ, inode, &off, &iter,
	    read_size, inode->i_size, NULL, &buffer_index, file);
	remaining = ret;
	/* this will only zero remaining unread portions of the page data */
	iov_iter_zero(~0U, &iter);
	/* takes care of potential aliasing */
	flush_dcache_page(page);
	if (ret < 0) {
		SetPageError(page);
		unlock_page(page);
		goto out;
	} else {
		SetPageUptodate(page);
		if (PageError(page))
			ClearPageError(page);
		ret = 0;
	}
	/* unlock the page after the ->readpage() routine completes */
	unlock_page(page);

	if (remaining > PAGE_SIZE) {
		slot_index = 0;
		while ((remaining - PAGE_SIZE) >= PAGE_SIZE) {
			remaining -= PAGE_SIZE;
			/*
			 * It is an optimization to try and fill more than one
			 * page... by now we've already gotten the single
			 * page we were after, if stuff doesn't seem to
			 * be going our way at this point just return
			 * and hope for the best.
			 *
			 * If we look for pages and they're already there is
			 * one reason to give up, and if they're not there
			 * and we can't create them is another reason.
			 */

			index++;
			slot_index++;
			next_page = find_get_page(inode->i_mapping, index);
			if (next_page) {
				gossip_debug(GOSSIP_FILE_DEBUG,
					"%s: found next page, quitting\n",
					__func__);
				put_page(next_page);
				goto out;
			}
			next_page = find_or_create_page(inode->i_mapping,
							index,
							GFP_KERNEL);
			/*
			 * I've never hit this, leave it as a printk for
			 * now so it will be obvious.
			 */
			if (!next_page) {
				printk("%s: can't create next page, quitting\n",
					__func__);
				goto out;
			}
			kaddr = kmap_atomic(next_page);
			orangefs_bufmap_page_fill(kaddr,
						buffer_index,
						slot_index);
			kunmap_atomic(kaddr);
			SetPageUptodate(next_page);
			unlock_page(next_page);
			put_page(next_page);
		}
	}

out:
	if (buffer_index != -1)
		orangefs_bufmap_put(buffer_index);
	return ret;
}

static int orangefs_write_begin(struct file *file,
    struct address_space *mapping,
    loff_t pos, unsigned len, unsigned flags, struct page **pagep,
    void **fsdata)
{
	struct orangefs_write_range *wr;
	struct page *page;
	pgoff_t index;
	int ret;

	index = pos >> PAGE_SHIFT;

	page = grab_cache_page_write_begin(mapping, index, flags);
	if (!page)
		return -ENOMEM;

	*pagep = page;

	if (PageDirty(page) && !PagePrivate(page)) {
		/*
		 * Should be impossible.  If it happens, launder the page
		 * since we don't know what's dirty.  This will WARN in
		 * orangefs_writepage_locked.
		 */
		ret = orangefs_launder_page(page);
		if (ret)
			return ret;
	}
	if (PagePrivate(page)) {
		struct orangefs_write_range *wr;
		wr = (struct orangefs_write_range *)page_private(page);
		if (wr->pos + wr->len == pos &&
		    uid_eq(wr->uid, current_fsuid()) &&
		    gid_eq(wr->gid, current_fsgid())) {
			wr->len += len;
			goto okay;
		} else {
			ret = orangefs_launder_page(page);
			if (ret)
				return ret;
		}
	}

	wr = kmalloc(sizeof *wr, GFP_KERNEL);
	if (!wr)
		return -ENOMEM;

	wr->pos = pos;
	wr->len = len;
	wr->uid = current_fsuid();
	wr->gid = current_fsgid();
	attach_page_private(page, wr);
okay:
	return 0;
}

static int orangefs_write_end(struct file *file, struct address_space *mapping,
    loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata)
{
	struct inode *inode = page->mapping->host;
	loff_t last_pos = pos + copied;

	/*
	 * No need to use i_size_read() here, the i_size
	 * cannot change under us because we hold the i_mutex.
	 */
	if (last_pos > inode->i_size)
		i_size_write(inode, last_pos);

	/* zero the stale part of the page if we did a short copy */
	if (!PageUptodate(page)) {
		unsigned from = pos & (PAGE_SIZE - 1);
		if (copied < len) {
			zero_user(page, from + copied, len - copied);
		}
		/* Set fully written pages uptodate. */
		if (pos == page_offset(page) &&
		    (len == PAGE_SIZE || pos + len == inode->i_size)) {
			zero_user_segment(page, from + copied, PAGE_SIZE);
			SetPageUptodate(page);
		}
	}

	set_page_dirty(page);
	unlock_page(page);
	put_page(page);

	mark_inode_dirty_sync(file_inode(file));
	return copied;
}

static void orangefs_invalidatepage(struct page *page,
				 unsigned int offset,
				 unsigned int length)
{
	struct orangefs_write_range *wr;
	wr = (struct orangefs_write_range *)page_private(page);

	if (offset == 0 && length == PAGE_SIZE) {
		kfree(detach_page_private(page));
		return;
	/* write range entirely within invalidate range (or equal) */
	} else if (page_offset(page) + offset <= wr->pos &&
	    wr->pos + wr->len <= page_offset(page) + offset + length) {
		kfree(detach_page_private(page));
		/* XXX is this right? only caller in fs */
		cancel_dirty_page(page);
		return;
	/* invalidate range chops off end of write range */
	} else if (wr->pos < page_offset(page) + offset &&
	    wr->pos + wr->len <= page_offset(page) + offset + length &&
	     page_offset(page) + offset < wr->pos + wr->len) {
		size_t x;
		x = wr->pos + wr->len - (page_offset(page) + offset);
		WARN_ON(x > wr->len);
		wr->len -= x;
		wr->uid = current_fsuid();
		wr->gid = current_fsgid();
	/* invalidate range chops off beginning of write range */
	} else if (page_offset(page) + offset <= wr->pos &&
	    page_offset(page) + offset + length < wr->pos + wr->len &&
	    wr->pos < page_offset(page) + offset + length) {
		size_t x;
		x = page_offset(page) + offset + length - wr->pos;
		WARN_ON(x > wr->len);
		wr->pos += x;
		wr->len -= x;
		wr->uid = current_fsuid();
		wr->gid = current_fsgid();
	/* invalidate range entirely within write range (punch hole) */
	} else if (wr->pos < page_offset(page) + offset &&
	    page_offset(page) + offset + length < wr->pos + wr->len) {
		/* XXX what do we do here... should not WARN_ON */
		WARN_ON(1);
		/* punch hole */
		/*
		 * should we just ignore this and write it out anyway?
		 * it hardly makes sense
		 */
		return;
	/* non-overlapping ranges */
	} else {
		/* WARN if they do overlap */
		if (!((page_offset(page) + offset + length <= wr->pos) ^
		    (wr->pos + wr->len <= page_offset(page) + offset))) {
			WARN_ON(1);
			printk("invalidate range offset %llu length %u\n",
			    page_offset(page) + offset, length);
			printk("write range offset %llu length %zu\n",
			    wr->pos, wr->len);
		}
		return;
	}

	/*
	 * Above there are returns where wr is freed or where we WARN.
	 * Thus the following runs if wr was modified above.
	 */

	orangefs_launder_page(page);
}

static int orangefs_releasepage(struct page *page, gfp_t foo)
{
	return !PagePrivate(page);
}

static void orangefs_freepage(struct page *page)
{
	kfree(detach_page_private(page));
}

static int orangefs_launder_page(struct page *page)
{
	int r = 0;
	struct writeback_control wbc = {
		.sync_mode = WB_SYNC_ALL,
		.nr_to_write = 0,
	};
	wait_on_page_writeback(page);
	if (clear_page_dirty_for_io(page)) {
		r = orangefs_writepage_locked(page, &wbc);
		end_page_writeback(page);
	}
	return r;
}

static ssize_t orangefs_direct_IO(struct kiocb *iocb,
				  struct iov_iter *iter)
{
	/*
	 * Comment from original do_readv_writev:
	 * Common entry point for read/write/readv/writev
	 * This function will dispatch it to either the direct I/O
	 * or buffered I/O path depending on the mount options and/or
	 * augmented/extended metadata attached to the file.
	 * Note: File extended attributes override any mount options.
	 */
	struct file *file = iocb->ki_filp;
	loff_t pos = iocb->ki_pos;
	enum ORANGEFS_io_type type = iov_iter_rw(iter) == WRITE ?
            ORANGEFS_IO_WRITE : ORANGEFS_IO_READ;
	loff_t *offset = &pos;
	struct inode *inode = file->f_mapping->host;
	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
	struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
	size_t count = iov_iter_count(iter);
	ssize_t total_count = 0;
	ssize_t ret = -EINVAL;
	int i = 0;

	gossip_debug(GOSSIP_FILE_DEBUG,
		"%s-BEGIN(%pU): count(%d) after estimate_max_iovecs.\n",
		__func__,
		handle,
		(int)count);

	if (type == ORANGEFS_IO_WRITE) {
		gossip_debug(GOSSIP_FILE_DEBUG,
			     "%s(%pU): proceeding with offset : %llu, "
			     "size %d\n",
			     __func__,
			     handle,
			     llu(*offset),
			     (int)count);
	}

	if (count == 0) {
		ret = 0;
		goto out;
	}

	while (iov_iter_count(iter)) {
		size_t each_count = iov_iter_count(iter);
		size_t amt_complete;
		i++;

		/* how much to transfer in this loop iteration */
		if (each_count > orangefs_bufmap_size_query())
			each_count = orangefs_bufmap_size_query();

		gossip_debug(GOSSIP_FILE_DEBUG,
			     "%s(%pU): size of each_count(%d)\n",
			     __func__,
			     handle,
			     (int)each_count);
		gossip_debug(GOSSIP_FILE_DEBUG,
			     "%s(%pU): BEFORE wait_for_io: offset is %d\n",
			     __func__,
			     handle,
			     (int)*offset);

		ret = wait_for_direct_io(type, inode, offset, iter,
				each_count, 0, NULL, NULL, file);
		gossip_debug(GOSSIP_FILE_DEBUG,
			     "%s(%pU): return from wait_for_io:%d\n",
			     __func__,
			     handle,
			     (int)ret);

		if (ret < 0)
			goto out;

		*offset += ret;
		total_count += ret;
		amt_complete = ret;

		gossip_debug(GOSSIP_FILE_DEBUG,
			     "%s(%pU): AFTER wait_for_io: offset is %d\n",
			     __func__,
			     handle,
			     (int)*offset);

		/*
		 * if we got a short I/O operations,
		 * fall out and return what we got so far
		 */
		if (amt_complete < each_count)
			break;
	} /*end while */

out:
	if (total_count > 0)
		ret = total_count;
	if (ret > 0) {
		if (type == ORANGEFS_IO_READ) {
			file_accessed(file);
		} else {
			file_update_time(file);
			if (*offset > i_size_read(inode))
				i_size_write(inode, *offset);
		}
	}

	gossip_debug(GOSSIP_FILE_DEBUG,
		     "%s(%pU): Value(%d) returned.\n",
		     __func__,
		     handle,
		     (int)ret);

	return ret;
}

/** ORANGEFS2 implementation of address space operations */
static const struct address_space_operations orangefs_address_operations = {
	.writepage = orangefs_writepage,
	.readpage = orangefs_readpage,
	.writepages = orangefs_writepages,
	.set_page_dirty = __set_page_dirty_nobuffers,
	.write_begin = orangefs_write_begin,
	.write_end = orangefs_write_end,
	.invalidatepage = orangefs_invalidatepage,
	.releasepage = orangefs_releasepage,
	.freepage = orangefs_freepage,
	.launder_page = orangefs_launder_page,
	.direct_IO = orangefs_direct_IO,
};

vm_fault_t orangefs_page_mkwrite(struct vm_fault *vmf)
{
	struct page *page = vmf->page;
	struct inode *inode = file_inode(vmf->vma->vm_file);
	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
	unsigned long *bitlock = &orangefs_inode->bitlock;
	vm_fault_t ret;
	struct orangefs_write_range *wr;

	sb_start_pagefault(inode->i_sb);

	if (wait_on_bit(bitlock, 1, TASK_KILLABLE)) {
		ret = VM_FAULT_RETRY;
		goto out;
	}

	lock_page(page);
	if (PageDirty(page) && !PagePrivate(page)) {
		/*
		 * Should be impossible.  If it happens, launder the page
		 * since we don't know what's dirty.  This will WARN in
		 * orangefs_writepage_locked.
		 */
		if (orangefs_launder_page(page)) {
			ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
			goto out;
		}
	}
	if (PagePrivate(page)) {
		wr = (struct orangefs_write_range *)page_private(page);
		if (uid_eq(wr->uid, current_fsuid()) &&
		    gid_eq(wr->gid, current_fsgid())) {
			wr->pos = page_offset(page);
			wr->len = PAGE_SIZE;
			goto okay;
		} else {
			if (orangefs_launder_page(page)) {
				ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
				goto out;
			}
		}
	}
	wr = kmalloc(sizeof *wr, GFP_KERNEL);
	if (!wr) {
		ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
		goto out;
	}
	wr->pos = page_offset(page);
	wr->len = PAGE_SIZE;
	wr->uid = current_fsuid();
	wr->gid = current_fsgid();
	attach_page_private(page, wr);
okay:

	file_update_time(vmf->vma->vm_file);
	if (page->mapping != inode->i_mapping) {
		unlock_page(page);
		ret = VM_FAULT_LOCKED|VM_FAULT_NOPAGE;
		goto out;
	}

	/*
	 * We mark the page dirty already here so that when freeze is in
	 * progress, we are guaranteed that writeback during freezing will
	 * see the dirty page and writeprotect it again.
	 */
	set_page_dirty(page);
	wait_for_stable_page(page);
	ret = VM_FAULT_LOCKED;
out:
	sb_end_pagefault(inode->i_sb);
	return ret;
}

static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
{
	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
	struct orangefs_kernel_op_s *new_op;
	loff_t orig_size;
	int ret = -EINVAL;

	gossip_debug(GOSSIP_INODE_DEBUG,
		     "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
		     __func__,
		     get_khandle_from_ino(inode),
		     &orangefs_inode->refn.khandle,
		     orangefs_inode->refn.fs_id,
		     iattr->ia_size);

	/* Ensure that we have a up to date size, so we know if it changed. */
	ret = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_SIZE);
	if (ret == -ESTALE)
		ret = -EIO;
	if (ret) {
		gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
		    __func__, ret);
		return ret;
	}
	orig_size = i_size_read(inode);

	/* This is truncate_setsize in a different order. */
	truncate_pagecache(inode, iattr->ia_size);
	i_size_write(inode, iattr->ia_size);
	if (iattr->ia_size > orig_size)
		pagecache_isize_extended(inode, orig_size, iattr->ia_size);

	new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
	if (!new_op)
		return -ENOMEM;

	new_op->upcall.req.truncate.refn = orangefs_inode->refn;
	new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;

	ret = service_operation(new_op,
		__func__,
		get_interruptible_flag(inode));

	/*
	 * the truncate has no downcall members to retrieve, but
	 * the status value tells us if it went through ok or not
	 */
	gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);

	op_release(new_op);

	if (ret != 0)
		return ret;

	if (orig_size != i_size_read(inode))
		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;

	return ret;
}

int __orangefs_setattr(struct inode *inode, struct iattr *iattr)
{
	int ret;

	if (iattr->ia_valid & ATTR_MODE) {
		if (iattr->ia_mode & (S_ISVTX)) {
			if (is_root_handle(inode)) {
				/*
				 * allow sticky bit to be set on root (since
				 * it shows up that way by default anyhow),
				 * but don't show it to the server
				 */
				iattr->ia_mode -= S_ISVTX;
			} else {
				gossip_debug(GOSSIP_UTILS_DEBUG,
					     "User attempted to set sticky bit on non-root directory; returning EINVAL.\n");
				ret = -EINVAL;
				goto out;
			}
		}
		if (iattr->ia_mode & (S_ISUID)) {
			gossip_debug(GOSSIP_UTILS_DEBUG,
				     "Attempting to set setuid bit (not supported); returning EINVAL.\n");
			ret = -EINVAL;
			goto out;
		}
	}

	if (iattr->ia_valid & ATTR_SIZE) {
		ret = orangefs_setattr_size(inode, iattr);
		if (ret)
			goto out;
	}

again:
	spin_lock(&inode->i_lock);
	if (ORANGEFS_I(inode)->attr_valid) {
		if (uid_eq(ORANGEFS_I(inode)->attr_uid, current_fsuid()) &&
		    gid_eq(ORANGEFS_I(inode)->attr_gid, current_fsgid())) {
			ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
		} else {
			spin_unlock(&inode->i_lock);
			write_inode_now(inode, 1);
			goto again;
		}
	} else {
		ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
		ORANGEFS_I(inode)->attr_uid = current_fsuid();
		ORANGEFS_I(inode)->attr_gid = current_fsgid();
	}
	setattr_copy(&init_user_ns, inode, iattr);
	spin_unlock(&inode->i_lock);
	mark_inode_dirty(inode);

	if (iattr->ia_valid & ATTR_MODE)
		/* change mod on a file that has ACLs */
		ret = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);

	ret = 0;
out:
	return ret;
}

/*
 * Change attributes of an object referenced by dentry.
 */
int orangefs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
		     struct iattr *iattr)
{
	int ret;
	gossip_debug(GOSSIP_INODE_DEBUG, "__orangefs_setattr: called on %pd\n",
	    dentry);
	ret = setattr_prepare(&init_user_ns, dentry, iattr);
	if (ret)
	        goto out;
	ret = __orangefs_setattr(d_inode(dentry), iattr);
	sync_inode_metadata(d_inode(dentry), 1);
out:
	gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n",
	    ret);
	return ret;
}

/*
 * Obtain attributes of an object given a dentry
 */
int orangefs_getattr(struct user_namespace *mnt_userns, const struct path *path,
		     struct kstat *stat, u32 request_mask, unsigned int flags)
{
	int ret;
	struct inode *inode = path->dentry->d_inode;

	gossip_debug(GOSSIP_INODE_DEBUG,
		     "orangefs_getattr: called on %pd mask %u\n",
		     path->dentry, request_mask);

	ret = orangefs_inode_getattr(inode,
	    request_mask & STATX_SIZE ? ORANGEFS_GETATTR_SIZE : 0);
	if (ret == 0) {
		generic_fillattr(&init_user_ns, inode, stat);

		/* override block size reported to stat */
		if (!(request_mask & STATX_SIZE))
			stat->result_mask &= ~STATX_SIZE;

		stat->attributes_mask = STATX_ATTR_IMMUTABLE |
		    STATX_ATTR_APPEND;
		if (inode->i_flags & S_IMMUTABLE)
			stat->attributes |= STATX_ATTR_IMMUTABLE;
		if (inode->i_flags & S_APPEND)
			stat->attributes |= STATX_ATTR_APPEND;
	}
	return ret;
}

int orangefs_permission(struct user_namespace *mnt_userns,
			struct inode *inode, int mask)
{
	int ret;

	if (mask & MAY_NOT_BLOCK)
		return -ECHILD;

	gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);

	/* Make sure the permission (and other common attrs) are up to date. */
	ret = orangefs_inode_getattr(inode, 0);
	if (ret < 0)
		return ret;

	return generic_permission(&init_user_ns, inode, mask);
}

int orangefs_update_time(struct inode *inode, struct timespec64 *time, int flags)
{
	struct iattr iattr;
	gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_update_time: %pU\n",
	    get_khandle_from_ino(inode));
	generic_update_time(inode, time, flags);
	memset(&iattr, 0, sizeof iattr);
        if (flags & S_ATIME)
		iattr.ia_valid |= ATTR_ATIME;
	if (flags & S_CTIME)
		iattr.ia_valid |= ATTR_CTIME;
	if (flags & S_MTIME)
		iattr.ia_valid |= ATTR_MTIME;
	return __orangefs_setattr(inode, &iattr);
}

/* ORANGEFS2 implementation of VFS inode operations for files */
static const struct inode_operations orangefs_file_inode_operations = {
	.get_acl = orangefs_get_acl,
	.set_acl = orangefs_set_acl,
	.setattr = orangefs_setattr,
	.getattr = orangefs_getattr,
	.listxattr = orangefs_listxattr,
	.permission = orangefs_permission,
	.update_time = orangefs_update_time,
};

static int orangefs_init_iops(struct inode *inode)
{
	inode->i_mapping->a_ops = &orangefs_address_operations;

	switch (inode->i_mode & S_IFMT) {
	case S_IFREG:
		inode->i_op = &orangefs_file_inode_operations;
		inode->i_fop = &orangefs_file_operations;
		break;
	case S_IFLNK:
		inode->i_op = &orangefs_symlink_inode_operations;
		break;
	case S_IFDIR:
		inode->i_op = &orangefs_dir_inode_operations;
		inode->i_fop = &orangefs_dir_operations;
		break;
	default:
		gossip_debug(GOSSIP_INODE_DEBUG,
			     "%s: unsupported mode\n",
			     __func__);
		return -EINVAL;
	}

	return 0;
}

/*
 * Given an ORANGEFS object identifier (fsid, handle), convert it into
 * a ino_t type that will be used as a hash-index from where the handle will
 * be searched for in the VFS hash table of inodes.
 */
static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
{
	if (!ref)
		return 0;
	return orangefs_khandle_to_ino(&(ref->khandle));
}

/*
 * Called to set up an inode from iget5_locked.
 */
static int orangefs_set_inode(struct inode *inode, void *data)
{
	struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
	ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
	ORANGEFS_I(inode)->refn.khandle = ref->khandle;
	ORANGEFS_I(inode)->attr_valid = 0;
	hash_init(ORANGEFS_I(inode)->xattr_cache);
	ORANGEFS_I(inode)->mapping_time = jiffies - 1;
	ORANGEFS_I(inode)->bitlock = 0;
	return 0;
}

/*
 * Called to determine if handles match.
 */
static int orangefs_test_inode(struct inode *inode, void *data)
{
	struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
	struct orangefs_inode_s *orangefs_inode = NULL;

	orangefs_inode = ORANGEFS_I(inode);
	/* test handles and fs_ids... */
	return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle),
				&(ref->khandle)) &&
			orangefs_inode->refn.fs_id == ref->fs_id);
}

/*
 * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
 * file handle.
 *
 * @sb: the file system super block instance.
 * @ref: The ORANGEFS object for which we are trying to locate an inode.
 */
struct inode *orangefs_iget(struct super_block *sb,
		struct orangefs_object_kref *ref)
{
	struct inode *inode = NULL;
	unsigned long hash;
	int error;

	hash = orangefs_handle_hash(ref);
	inode = iget5_locked(sb,
			hash,
			orangefs_test_inode,
			orangefs_set_inode,
			ref);

	if (!inode)
		return ERR_PTR(-ENOMEM);

	if (!(inode->i_state & I_NEW))
		return inode;

	error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
	if (error) {
		iget_failed(inode);
		return ERR_PTR(error);
	}

	inode->i_ino = hash;	/* needed for stat etc */
	orangefs_init_iops(inode);
	unlock_new_inode(inode);

	gossip_debug(GOSSIP_INODE_DEBUG,
		     "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
		     &ref->khandle,
		     ref->fs_id,
		     hash,
		     inode->i_ino);

	return inode;
}

/*
 * Allocate an inode for a newly created file and insert it into the inode hash.
 */
struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
		int mode, dev_t dev, struct orangefs_object_kref *ref)
{
	unsigned long hash = orangefs_handle_hash(ref);
	struct inode *inode;
	int error;

	gossip_debug(GOSSIP_INODE_DEBUG,
		     "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
		     __func__,
		     sb,
		     MAJOR(dev),
		     MINOR(dev),
		     mode);

	inode = new_inode(sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);

	orangefs_set_inode(inode, ref);
	inode->i_ino = hash;	/* needed for stat etc */

	error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
	if (error)
		goto out_iput;

	orangefs_init_iops(inode);
	inode->i_rdev = dev;

	error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
	if (error < 0)
		goto out_iput;

	gossip_debug(GOSSIP_INODE_DEBUG,
		     "Initializing ACL's for inode %pU\n",
		     get_khandle_from_ino(inode));
	orangefs_init_acl(inode, dir);
	return inode;

out_iput:
	iput(inode);
	return ERR_PTR(error);
}