forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathrgrp.c
1791 lines (1539 loc) · 44.8 KB
/
rgrp.c
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
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*/
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/gfs2_ondisk.h>
#include <linux/prefetch.h>
#include <linux/blkdev.h>
#include <linux/rbtree.h>
#include "gfs2.h"
#include "incore.h"
#include "glock.h"
#include "glops.h"
#include "lops.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "super.h"
#include "trans.h"
#include "util.h"
#include "log.h"
#include "inode.h"
#include "trace_gfs2.h"
#define BFITNOENT ((u32)~0)
#define NO_BLOCK ((u64)~0)
#if BITS_PER_LONG == 32
#define LBITMASK (0x55555555UL)
#define LBITSKIP55 (0x55555555UL)
#define LBITSKIP00 (0x00000000UL)
#else
#define LBITMASK (0x5555555555555555UL)
#define LBITSKIP55 (0x5555555555555555UL)
#define LBITSKIP00 (0x0000000000000000UL)
#endif
/*
* These routines are used by the resource group routines (rgrp.c)
* to keep track of block allocation. Each block is represented by two
* bits. So, each byte represents GFS2_NBBY (i.e. 4) blocks.
*
* 0 = Free
* 1 = Used (not metadata)
* 2 = Unlinked (still in use) inode
* 3 = Used (metadata)
*/
static const char valid_change[16] = {
/* current */
/* n */ 0, 1, 1, 1,
/* e */ 1, 0, 0, 0,
/* w */ 0, 0, 0, 1,
1, 0, 0, 0
};
static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
unsigned char old_state,
struct gfs2_bitmap **rbi);
/**
* gfs2_setbit - Set a bit in the bitmaps
* @buffer: the buffer that holds the bitmaps
* @buflen: the length (in bytes) of the buffer
* @block: the block to set
* @new_state: the new state of the block
*
*/
static inline void gfs2_setbit(struct gfs2_rgrpd *rgd, unsigned char *buf1,
unsigned char *buf2, unsigned int offset,
struct gfs2_bitmap *bi, u32 block,
unsigned char new_state)
{
unsigned char *byte1, *byte2, *end, cur_state;
unsigned int buflen = bi->bi_len;
const unsigned int bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
byte1 = buf1 + offset + (block / GFS2_NBBY);
end = buf1 + offset + buflen;
BUG_ON(byte1 >= end);
cur_state = (*byte1 >> bit) & GFS2_BIT_MASK;
if (unlikely(!valid_change[new_state * 4 + cur_state])) {
printk(KERN_WARNING "GFS2: buf_blk = 0x%llx old_state=%d, "
"new_state=%d\n",
(unsigned long long)block, cur_state, new_state);
printk(KERN_WARNING "GFS2: rgrp=0x%llx bi_start=0x%lx\n",
(unsigned long long)rgd->rd_addr,
(unsigned long)bi->bi_start);
printk(KERN_WARNING "GFS2: bi_offset=0x%lx bi_len=0x%lx\n",
(unsigned long)bi->bi_offset,
(unsigned long)bi->bi_len);
dump_stack();
gfs2_consist_rgrpd(rgd);
return;
}
*byte1 ^= (cur_state ^ new_state) << bit;
if (buf2) {
byte2 = buf2 + offset + (block / GFS2_NBBY);
cur_state = (*byte2 >> bit) & GFS2_BIT_MASK;
*byte2 ^= (cur_state ^ new_state) << bit;
}
}
/**
* gfs2_testbit - test a bit in the bitmaps
* @buffer: the buffer that holds the bitmaps
* @buflen: the length (in bytes) of the buffer
* @block: the block to read
*
*/
static inline unsigned char gfs2_testbit(struct gfs2_rgrpd *rgd,
const unsigned char *buffer,
unsigned int buflen, u32 block)
{
const unsigned char *byte, *end;
unsigned char cur_state;
unsigned int bit;
byte = buffer + (block / GFS2_NBBY);
bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
end = buffer + buflen;
gfs2_assert(rgd->rd_sbd, byte < end);
cur_state = (*byte >> bit) & GFS2_BIT_MASK;
return cur_state;
}
/**
* gfs2_bit_search
* @ptr: Pointer to bitmap data
* @mask: Mask to use (normally 0x55555.... but adjusted for search start)
* @state: The state we are searching for
*
* We xor the bitmap data with a patter which is the bitwise opposite
* of what we are looking for, this gives rise to a pattern of ones
* wherever there is a match. Since we have two bits per entry, we
* take this pattern, shift it down by one place and then and it with
* the original. All the even bit positions (0,2,4, etc) then represent
* successful matches, so we mask with 0x55555..... to remove the unwanted
* odd bit positions.
*
* This allows searching of a whole u64 at once (32 blocks) with a
* single test (on 64 bit arches).
*/
static inline u64 gfs2_bit_search(const __le64 *ptr, u64 mask, u8 state)
{
u64 tmp;
static const u64 search[] = {
[0] = 0xffffffffffffffffULL,
[1] = 0xaaaaaaaaaaaaaaaaULL,
[2] = 0x5555555555555555ULL,
[3] = 0x0000000000000000ULL,
};
tmp = le64_to_cpu(*ptr) ^ search[state];
tmp &= (tmp >> 1);
tmp &= mask;
return tmp;
}
/**
* gfs2_bitfit - Search an rgrp's bitmap buffer to find a bit-pair representing
* a block in a given allocation state.
* @buffer: the buffer that holds the bitmaps
* @len: the length (in bytes) of the buffer
* @goal: start search at this block's bit-pair (within @buffer)
* @state: GFS2_BLKST_XXX the state of the block we're looking for.
*
* Scope of @goal and returned block number is only within this bitmap buffer,
* not entire rgrp or filesystem. @buffer will be offset from the actual
* beginning of a bitmap block buffer, skipping any header structures, but
* headers are always a multiple of 64 bits long so that the buffer is
* always aligned to a 64 bit boundary.
*
* The size of the buffer is in bytes, but is it assumed that it is
* always ok to read a complete multiple of 64 bits at the end
* of the block in case the end is no aligned to a natural boundary.
*
* Return: the block number (bitmap buffer scope) that was found
*/
static u32 gfs2_bitfit(const u8 *buf, const unsigned int len,
u32 goal, u8 state)
{
u32 spoint = (goal << 1) & ((8*sizeof(u64)) - 1);
const __le64 *ptr = ((__le64 *)buf) + (goal >> 5);
const __le64 *end = (__le64 *)(buf + ALIGN(len, sizeof(u64)));
u64 tmp;
u64 mask = 0x5555555555555555ULL;
u32 bit;
BUG_ON(state > 3);
/* Mask off bits we don't care about at the start of the search */
mask <<= spoint;
tmp = gfs2_bit_search(ptr, mask, state);
ptr++;
while(tmp == 0 && ptr < end) {
tmp = gfs2_bit_search(ptr, 0x5555555555555555ULL, state);
ptr++;
}
/* Mask off any bits which are more than len bytes from the start */
if (ptr == end && (len & (sizeof(u64) - 1)))
tmp &= (((u64)~0) >> (64 - 8*(len & (sizeof(u64) - 1))));
/* Didn't find anything, so return */
if (tmp == 0)
return BFITNOENT;
ptr--;
bit = __ffs64(tmp);
bit /= 2; /* two bits per entry in the bitmap */
return (((const unsigned char *)ptr - buf) * GFS2_NBBY) + bit;
}
/**
* gfs2_bitcount - count the number of bits in a certain state
* @buffer: the buffer that holds the bitmaps
* @buflen: the length (in bytes) of the buffer
* @state: the state of the block we're looking for
*
* Returns: The number of bits
*/
static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, const u8 *buffer,
unsigned int buflen, u8 state)
{
const u8 *byte = buffer;
const u8 *end = buffer + buflen;
const u8 state1 = state << 2;
const u8 state2 = state << 4;
const u8 state3 = state << 6;
u32 count = 0;
for (; byte < end; byte++) {
if (((*byte) & 0x03) == state)
count++;
if (((*byte) & 0x0C) == state1)
count++;
if (((*byte) & 0x30) == state2)
count++;
if (((*byte) & 0xC0) == state3)
count++;
}
return count;
}
/**
* gfs2_rgrp_verify - Verify that a resource group is consistent
* @sdp: the filesystem
* @rgd: the rgrp
*
*/
void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd)
{
struct gfs2_sbd *sdp = rgd->rd_sbd;
struct gfs2_bitmap *bi = NULL;
u32 length = rgd->rd_length;
u32 count[4], tmp;
int buf, x;
memset(count, 0, 4 * sizeof(u32));
/* Count # blocks in each of 4 possible allocation states */
for (buf = 0; buf < length; buf++) {
bi = rgd->rd_bits + buf;
for (x = 0; x < 4; x++)
count[x] += gfs2_bitcount(rgd,
bi->bi_bh->b_data +
bi->bi_offset,
bi->bi_len, x);
}
if (count[0] != rgd->rd_free) {
if (gfs2_consist_rgrpd(rgd))
fs_err(sdp, "free data mismatch: %u != %u\n",
count[0], rgd->rd_free);
return;
}
tmp = rgd->rd_data - rgd->rd_free - rgd->rd_dinodes;
if (count[1] != tmp) {
if (gfs2_consist_rgrpd(rgd))
fs_err(sdp, "used data mismatch: %u != %u\n",
count[1], tmp);
return;
}
if (count[2] + count[3] != rgd->rd_dinodes) {
if (gfs2_consist_rgrpd(rgd))
fs_err(sdp, "used metadata mismatch: %u != %u\n",
count[2] + count[3], rgd->rd_dinodes);
return;
}
}
static inline int rgrp_contains_block(struct gfs2_rgrpd *rgd, u64 block)
{
u64 first = rgd->rd_data0;
u64 last = first + rgd->rd_data;
return first <= block && block < last;
}
/**
* gfs2_blk2rgrpd - Find resource group for a given data/meta block number
* @sdp: The GFS2 superblock
* @n: The data block number
*
* Returns: The resource group, or NULL if not found
*/
struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk, bool exact)
{
struct rb_node *n, *next;
struct gfs2_rgrpd *cur;
spin_lock(&sdp->sd_rindex_spin);
n = sdp->sd_rindex_tree.rb_node;
while (n) {
cur = rb_entry(n, struct gfs2_rgrpd, rd_node);
next = NULL;
if (blk < cur->rd_addr)
next = n->rb_left;
else if (blk >= cur->rd_data0 + cur->rd_data)
next = n->rb_right;
if (next == NULL) {
spin_unlock(&sdp->sd_rindex_spin);
if (exact) {
if (blk < cur->rd_addr)
return NULL;
if (blk >= cur->rd_data0 + cur->rd_data)
return NULL;
}
return cur;
}
n = next;
}
spin_unlock(&sdp->sd_rindex_spin);
return NULL;
}
/**
* gfs2_rgrpd_get_first - get the first Resource Group in the filesystem
* @sdp: The GFS2 superblock
*
* Returns: The first rgrp in the filesystem
*/
struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp)
{
const struct rb_node *n;
struct gfs2_rgrpd *rgd;
spin_lock(&sdp->sd_rindex_spin);
n = rb_first(&sdp->sd_rindex_tree);
rgd = rb_entry(n, struct gfs2_rgrpd, rd_node);
spin_unlock(&sdp->sd_rindex_spin);
return rgd;
}
/**
* gfs2_rgrpd_get_next - get the next RG
* @rgd: A RG
*
* Returns: The next rgrp
*/
struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd)
{
struct gfs2_sbd *sdp = rgd->rd_sbd;
const struct rb_node *n;
spin_lock(&sdp->sd_rindex_spin);
n = rb_next(&rgd->rd_node);
if (n == NULL)
n = rb_first(&sdp->sd_rindex_tree);
if (unlikely(&rgd->rd_node == n)) {
spin_unlock(&sdp->sd_rindex_spin);
return NULL;
}
rgd = rb_entry(n, struct gfs2_rgrpd, rd_node);
spin_unlock(&sdp->sd_rindex_spin);
return rgd;
}
void gfs2_free_clones(struct gfs2_rgrpd *rgd)
{
int x;
for (x = 0; x < rgd->rd_length; x++) {
struct gfs2_bitmap *bi = rgd->rd_bits + x;
kfree(bi->bi_clone);
bi->bi_clone = NULL;
}
}
void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
{
struct rb_node *n;
struct gfs2_rgrpd *rgd;
struct gfs2_glock *gl;
while ((n = rb_first(&sdp->sd_rindex_tree))) {
rgd = rb_entry(n, struct gfs2_rgrpd, rd_node);
gl = rgd->rd_gl;
rb_erase(n, &sdp->sd_rindex_tree);
if (gl) {
spin_lock(&gl->gl_spin);
gl->gl_object = NULL;
spin_unlock(&gl->gl_spin);
gfs2_glock_add_to_lru(gl);
gfs2_glock_put(gl);
}
gfs2_free_clones(rgd);
kfree(rgd->rd_bits);
kmem_cache_free(gfs2_rgrpd_cachep, rgd);
}
}
static void gfs2_rindex_print(const struct gfs2_rgrpd *rgd)
{
printk(KERN_INFO " ri_addr = %llu\n", (unsigned long long)rgd->rd_addr);
printk(KERN_INFO " ri_length = %u\n", rgd->rd_length);
printk(KERN_INFO " ri_data0 = %llu\n", (unsigned long long)rgd->rd_data0);
printk(KERN_INFO " ri_data = %u\n", rgd->rd_data);
printk(KERN_INFO " ri_bitbytes = %u\n", rgd->rd_bitbytes);
}
/**
* gfs2_compute_bitstructs - Compute the bitmap sizes
* @rgd: The resource group descriptor
*
* Calculates bitmap descriptors, one for each block that contains bitmap data
*
* Returns: errno
*/
static int compute_bitstructs(struct gfs2_rgrpd *rgd)
{
struct gfs2_sbd *sdp = rgd->rd_sbd;
struct gfs2_bitmap *bi;
u32 length = rgd->rd_length; /* # blocks in hdr & bitmap */
u32 bytes_left, bytes;
int x;
if (!length)
return -EINVAL;
rgd->rd_bits = kcalloc(length, sizeof(struct gfs2_bitmap), GFP_NOFS);
if (!rgd->rd_bits)
return -ENOMEM;
bytes_left = rgd->rd_bitbytes;
for (x = 0; x < length; x++) {
bi = rgd->rd_bits + x;
bi->bi_flags = 0;
/* small rgrp; bitmap stored completely in header block */
if (length == 1) {
bytes = bytes_left;
bi->bi_offset = sizeof(struct gfs2_rgrp);
bi->bi_start = 0;
bi->bi_len = bytes;
/* header block */
} else if (x == 0) {
bytes = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_rgrp);
bi->bi_offset = sizeof(struct gfs2_rgrp);
bi->bi_start = 0;
bi->bi_len = bytes;
/* last block */
} else if (x + 1 == length) {
bytes = bytes_left;
bi->bi_offset = sizeof(struct gfs2_meta_header);
bi->bi_start = rgd->rd_bitbytes - bytes_left;
bi->bi_len = bytes;
/* other blocks */
} else {
bytes = sdp->sd_sb.sb_bsize -
sizeof(struct gfs2_meta_header);
bi->bi_offset = sizeof(struct gfs2_meta_header);
bi->bi_start = rgd->rd_bitbytes - bytes_left;
bi->bi_len = bytes;
}
bytes_left -= bytes;
}
if (bytes_left) {
gfs2_consist_rgrpd(rgd);
return -EIO;
}
bi = rgd->rd_bits + (length - 1);
if ((bi->bi_start + bi->bi_len) * GFS2_NBBY != rgd->rd_data) {
if (gfs2_consist_rgrpd(rgd)) {
gfs2_rindex_print(rgd);
fs_err(sdp, "start=%u len=%u offset=%u\n",
bi->bi_start, bi->bi_len, bi->bi_offset);
}
return -EIO;
}
return 0;
}
/**
* gfs2_ri_total - Total up the file system space, according to the rindex.
*
*/
u64 gfs2_ri_total(struct gfs2_sbd *sdp)
{
u64 total_data = 0;
struct inode *inode = sdp->sd_rindex;
struct gfs2_inode *ip = GFS2_I(inode);
char buf[sizeof(struct gfs2_rindex)];
struct file_ra_state ra_state;
int error, rgrps;
file_ra_state_init(&ra_state, inode->i_mapping);
for (rgrps = 0;; rgrps++) {
loff_t pos = rgrps * sizeof(struct gfs2_rindex);
if (pos + sizeof(struct gfs2_rindex) > i_size_read(inode))
break;
error = gfs2_internal_read(ip, &ra_state, buf, &pos,
sizeof(struct gfs2_rindex));
if (error != sizeof(struct gfs2_rindex))
break;
total_data += be32_to_cpu(((struct gfs2_rindex *)buf)->ri_data);
}
return total_data;
}
static int rgd_insert(struct gfs2_rgrpd *rgd)
{
struct gfs2_sbd *sdp = rgd->rd_sbd;
struct rb_node **newn = &sdp->sd_rindex_tree.rb_node, *parent = NULL;
/* Figure out where to put new node */
while (*newn) {
struct gfs2_rgrpd *cur = rb_entry(*newn, struct gfs2_rgrpd,
rd_node);
parent = *newn;
if (rgd->rd_addr < cur->rd_addr)
newn = &((*newn)->rb_left);
else if (rgd->rd_addr > cur->rd_addr)
newn = &((*newn)->rb_right);
else
return -EEXIST;
}
rb_link_node(&rgd->rd_node, parent, newn);
rb_insert_color(&rgd->rd_node, &sdp->sd_rindex_tree);
sdp->sd_rgrps++;
return 0;
}
/**
* read_rindex_entry - Pull in a new resource index entry from the disk
* @gl: The glock covering the rindex inode
*
* Returns: 0 on success, > 0 on EOF, error code otherwise
*/
static int read_rindex_entry(struct gfs2_inode *ip,
struct file_ra_state *ra_state)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
struct gfs2_rindex buf;
int error;
struct gfs2_rgrpd *rgd;
if (pos >= i_size_read(&ip->i_inode))
return 1;
error = gfs2_internal_read(ip, ra_state, (char *)&buf, &pos,
sizeof(struct gfs2_rindex));
if (error != sizeof(struct gfs2_rindex))
return (error == 0) ? 1 : error;
rgd = kmem_cache_zalloc(gfs2_rgrpd_cachep, GFP_NOFS);
error = -ENOMEM;
if (!rgd)
return error;
rgd->rd_sbd = sdp;
rgd->rd_addr = be64_to_cpu(buf.ri_addr);
rgd->rd_length = be32_to_cpu(buf.ri_length);
rgd->rd_data0 = be64_to_cpu(buf.ri_data0);
rgd->rd_data = be32_to_cpu(buf.ri_data);
rgd->rd_bitbytes = be32_to_cpu(buf.ri_bitbytes);
error = compute_bitstructs(rgd);
if (error)
goto fail;
error = gfs2_glock_get(sdp, rgd->rd_addr,
&gfs2_rgrp_glops, CREATE, &rgd->rd_gl);
if (error)
goto fail;
rgd->rd_gl->gl_object = rgd;
rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
if (rgd->rd_data > sdp->sd_max_rg_data)
sdp->sd_max_rg_data = rgd->rd_data;
spin_lock(&sdp->sd_rindex_spin);
error = rgd_insert(rgd);
spin_unlock(&sdp->sd_rindex_spin);
if (!error)
return 0;
error = 0; /* someone else read in the rgrp; free it and ignore it */
gfs2_glock_put(rgd->rd_gl);
fail:
kfree(rgd->rd_bits);
kmem_cache_free(gfs2_rgrpd_cachep, rgd);
return error;
}
/**
* gfs2_ri_update - Pull in a new resource index from the disk
* @ip: pointer to the rindex inode
*
* Returns: 0 on successful update, error code otherwise
*/
static int gfs2_ri_update(struct gfs2_inode *ip)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct inode *inode = &ip->i_inode;
struct file_ra_state ra_state;
int error;
file_ra_state_init(&ra_state, inode->i_mapping);
do {
error = read_rindex_entry(ip, &ra_state);
} while (error == 0);
if (error < 0)
return error;
sdp->sd_rindex_uptodate = 1;
return 0;
}
/**
* gfs2_rindex_update - Update the rindex if required
* @sdp: The GFS2 superblock
*
* We grab a lock on the rindex inode to make sure that it doesn't
* change whilst we are performing an operation. We keep this lock
* for quite long periods of time compared to other locks. This
* doesn't matter, since it is shared and it is very, very rarely
* accessed in the exclusive mode (i.e. only when expanding the filesystem).
*
* This makes sure that we're using the latest copy of the resource index
* special file, which might have been updated if someone expanded the
* filesystem (via gfs2_grow utility), which adds new resource groups.
*
* Returns: 0 on succeess, error code otherwise
*/
int gfs2_rindex_update(struct gfs2_sbd *sdp)
{
struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
struct gfs2_glock *gl = ip->i_gl;
struct gfs2_holder ri_gh;
int error = 0;
int unlock_required = 0;
/* Read new copy from disk if we don't have the latest */
if (!sdp->sd_rindex_uptodate) {
if (!gfs2_glock_is_locked_by_me(gl)) {
error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, &ri_gh);
if (error)
return error;
unlock_required = 1;
}
if (!sdp->sd_rindex_uptodate)
error = gfs2_ri_update(ip);
if (unlock_required)
gfs2_glock_dq_uninit(&ri_gh);
}
return error;
}
static void gfs2_rgrp_in(struct gfs2_rgrpd *rgd, const void *buf)
{
const struct gfs2_rgrp *str = buf;
u32 rg_flags;
rg_flags = be32_to_cpu(str->rg_flags);
rg_flags &= ~GFS2_RDF_MASK;
rgd->rd_flags &= GFS2_RDF_MASK;
rgd->rd_flags |= rg_flags;
rgd->rd_free = be32_to_cpu(str->rg_free);
rgd->rd_dinodes = be32_to_cpu(str->rg_dinodes);
rgd->rd_igeneration = be64_to_cpu(str->rg_igeneration);
}
static void gfs2_rgrp_out(struct gfs2_rgrpd *rgd, void *buf)
{
struct gfs2_rgrp *str = buf;
str->rg_flags = cpu_to_be32(rgd->rd_flags & ~GFS2_RDF_MASK);
str->rg_free = cpu_to_be32(rgd->rd_free);
str->rg_dinodes = cpu_to_be32(rgd->rd_dinodes);
str->__pad = cpu_to_be32(0);
str->rg_igeneration = cpu_to_be64(rgd->rd_igeneration);
memset(&str->rg_reserved, 0, sizeof(str->rg_reserved));
}
/**
* gfs2_rgrp_go_lock - Read in a RG's header and bitmaps
* @rgd: the struct gfs2_rgrpd describing the RG to read in
*
* Read in all of a Resource Group's header and bitmap blocks.
* Caller must eventually call gfs2_rgrp_relse() to free the bitmaps.
*
* Returns: errno
*/
int gfs2_rgrp_go_lock(struct gfs2_holder *gh)
{
struct gfs2_rgrpd *rgd = gh->gh_gl->gl_object;
struct gfs2_sbd *sdp = rgd->rd_sbd;
struct gfs2_glock *gl = rgd->rd_gl;
unsigned int length = rgd->rd_length;
struct gfs2_bitmap *bi;
unsigned int x, y;
int error;
for (x = 0; x < length; x++) {
bi = rgd->rd_bits + x;
error = gfs2_meta_read(gl, rgd->rd_addr + x, 0, &bi->bi_bh);
if (error)
goto fail;
}
for (y = length; y--;) {
bi = rgd->rd_bits + y;
error = gfs2_meta_wait(sdp, bi->bi_bh);
if (error)
goto fail;
if (gfs2_metatype_check(sdp, bi->bi_bh, y ? GFS2_METATYPE_RB :
GFS2_METATYPE_RG)) {
error = -EIO;
goto fail;
}
}
if (!(rgd->rd_flags & GFS2_RDF_UPTODATE)) {
for (x = 0; x < length; x++)
clear_bit(GBF_FULL, &rgd->rd_bits[x].bi_flags);
gfs2_rgrp_in(rgd, (rgd->rd_bits[0].bi_bh)->b_data);
rgd->rd_flags |= (GFS2_RDF_UPTODATE | GFS2_RDF_CHECK);
rgd->rd_free_clone = rgd->rd_free;
}
return 0;
fail:
while (x--) {
bi = rgd->rd_bits + x;
brelse(bi->bi_bh);
bi->bi_bh = NULL;
gfs2_assert_warn(sdp, !bi->bi_clone);
}
return error;
}
/**
* gfs2_rgrp_go_unlock - Release RG bitmaps read in with gfs2_rgrp_bh_get()
* @rgd: the struct gfs2_rgrpd describing the RG to read in
*
*/
void gfs2_rgrp_go_unlock(struct gfs2_holder *gh)
{
struct gfs2_rgrpd *rgd = gh->gh_gl->gl_object;
int x, length = rgd->rd_length;
for (x = 0; x < length; x++) {
struct gfs2_bitmap *bi = rgd->rd_bits + x;
brelse(bi->bi_bh);
bi->bi_bh = NULL;
}
}
int gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
struct buffer_head *bh,
const struct gfs2_bitmap *bi, unsigned minlen, u64 *ptrimmed)
{
struct super_block *sb = sdp->sd_vfs;
struct block_device *bdev = sb->s_bdev;
const unsigned int sects_per_blk = sdp->sd_sb.sb_bsize /
bdev_logical_block_size(sb->s_bdev);
u64 blk;
sector_t start = 0;
sector_t nr_sects = 0;
int rv;
unsigned int x;
u32 trimmed = 0;
u8 diff;
for (x = 0; x < bi->bi_len; x++) {
const u8 *clone = bi->bi_clone ? bi->bi_clone : bi->bi_bh->b_data;
clone += bi->bi_offset;
clone += x;
if (bh) {
const u8 *orig = bh->b_data + bi->bi_offset + x;
diff = ~(*orig | (*orig >> 1)) & (*clone | (*clone >> 1));
} else {
diff = ~(*clone | (*clone >> 1));
}
diff &= 0x55;
if (diff == 0)
continue;
blk = offset + ((bi->bi_start + x) * GFS2_NBBY);
blk *= sects_per_blk; /* convert to sectors */
while(diff) {
if (diff & 1) {
if (nr_sects == 0)
goto start_new_extent;
if ((start + nr_sects) != blk) {
if (nr_sects >= minlen) {
rv = blkdev_issue_discard(bdev,
start, nr_sects,
GFP_NOFS, 0);
if (rv)
goto fail;
trimmed += nr_sects;
}
nr_sects = 0;
start_new_extent:
start = blk;
}
nr_sects += sects_per_blk;
}
diff >>= 2;
blk += sects_per_blk;
}
}
if (nr_sects >= minlen) {
rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS, 0);
if (rv)
goto fail;
trimmed += nr_sects;
}
if (ptrimmed)
*ptrimmed = trimmed;
return 0;
fail:
if (sdp->sd_args.ar_discard)
fs_warn(sdp, "error %d on discard request, turning discards off for this filesystem", rv);
sdp->sd_args.ar_discard = 0;
return -EIO;
}
/**
* gfs2_fitrim - Generate discard requests for unused bits of the filesystem
* @filp: Any file on the filesystem
* @argp: Pointer to the arguments (also used to pass result)
*
* Returns: 0 on success, otherwise error code
*/
int gfs2_fitrim(struct file *filp, void __user *argp)
{
struct inode *inode = filp->f_dentry->d_inode;
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct request_queue *q = bdev_get_queue(sdp->sd_vfs->s_bdev);
struct buffer_head *bh;
struct gfs2_rgrpd *rgd;
struct gfs2_rgrpd *rgd_end;
struct gfs2_holder gh;
struct fstrim_range r;
int ret = 0;
u64 amt;
u64 trimmed = 0;
unsigned int x;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
return -EOPNOTSUPP;
if (argp == NULL) {
r.start = 0;
r.len = ULLONG_MAX;
r.minlen = 0;
} else if (copy_from_user(&r, argp, sizeof(r)))
return -EFAULT;
ret = gfs2_rindex_update(sdp);
if (ret)
return ret;
rgd = gfs2_blk2rgrpd(sdp, r.start, 0);
rgd_end = gfs2_blk2rgrpd(sdp, r.start + r.len, 0);
while (1) {
ret = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
if (ret)
goto out;
if (!(rgd->rd_flags & GFS2_RGF_TRIMMED)) {
/* Trim each bitmap in the rgrp */
for (x = 0; x < rgd->rd_length; x++) {
struct gfs2_bitmap *bi = rgd->rd_bits + x;
ret = gfs2_rgrp_send_discards(sdp, rgd->rd_data0, NULL, bi, r.minlen, &amt);
if (ret) {
gfs2_glock_dq_uninit(&gh);
goto out;
}
trimmed += amt;
}
/* Mark rgrp as having been trimmed */
ret = gfs2_trans_begin(sdp, RES_RG_HDR, 0);
if (ret == 0) {
bh = rgd->rd_bits[0].bi_bh;
rgd->rd_flags |= GFS2_RGF_TRIMMED;
gfs2_trans_add_bh(rgd->rd_gl, bh, 1);
gfs2_rgrp_out(rgd, bh->b_data);
gfs2_trans_end(sdp);
}
}
gfs2_glock_dq_uninit(&gh);
if (rgd == rgd_end)
break;
rgd = gfs2_rgrpd_get_next(rgd);
}
out:
r.len = trimmed << 9;
if (argp && copy_to_user(argp, &r, sizeof(r)))
return -EFAULT;
return ret;
}
/**
* gfs2_qadata_get - get the struct gfs2_qadata structure for an inode
* @ip: the incore GFS2 inode structure
*
* Returns: the struct gfs2_qadata
*/
struct gfs2_qadata *gfs2_qadata_get(struct gfs2_inode *ip)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
int error;
BUG_ON(ip->i_qadata != NULL);
ip->i_qadata = kzalloc(sizeof(struct gfs2_qadata), GFP_NOFS);
error = gfs2_rindex_update(sdp);
if (error)
fs_warn(sdp, "rindex update returns %d\n", error);
return ip->i_qadata;
}
/**
* gfs2_blkrsv_get - get the struct gfs2_blkreserv structure for an inode
* @ip: the incore GFS2 inode structure