2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2006-2009 Neil Brown <neilb@suse.de>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * Email: <neilb@suse.de>
28 /* To restripe, we read from old geometry to a buffer, and
29 * read from buffer to new geometry.
30 * When reading, we might have missing devices and so could need
32 * When writing, we need to create correct parity and Q.
36 int geo_map(int block
, unsigned long long stripe
, int raid_disks
,
37 int level
, int layout
)
39 /* On the given stripe, find which disk in the array will have
40 * block numbered 'block'.
41 * '-1' means the parity block.
42 * '-2' means the Q syndrome.
46 /* layout is not relevant for raid0 and raid4 */
51 switch(level
*100 + layout
) {
54 case 500 + ALGORITHM_PARITY_N
:
55 /* raid 4 isn't messed around by parity blocks */
57 return raid_disks
-1; /* parity block */
59 case 500 + ALGORITHM_LEFT_ASYMMETRIC
:
60 pd
= (raid_disks
-1) - stripe
% raid_disks
;
67 case 500 + ALGORITHM_RIGHT_ASYMMETRIC
:
68 pd
= stripe
% raid_disks
;
75 case 500 + ALGORITHM_LEFT_SYMMETRIC
:
76 pd
= (raid_disks
- 1) - stripe
% raid_disks
;
79 return (pd
+ 1 + block
) % raid_disks
;
81 case 500 + ALGORITHM_RIGHT_SYMMETRIC
:
82 pd
= stripe
% raid_disks
;
85 return (pd
+ 1 + block
) % raid_disks
;
87 case 500 + ALGORITHM_PARITY_0
:
90 case 600 + ALGORITHM_PARITY_N_6
:
92 return raid_disks
- 1;
94 return raid_disks
- 2; /* parity block */
96 case 600 + ALGORITHM_LEFT_ASYMMETRIC_6
:
98 return raid_disks
- 1;
100 pd
= (raid_disks
-1) - stripe
% raid_disks
;
107 case 600 + ALGORITHM_RIGHT_ASYMMETRIC_6
:
109 return raid_disks
- 1;
111 pd
= stripe
% raid_disks
;
118 case 600 + ALGORITHM_LEFT_SYMMETRIC_6
:
120 return raid_disks
- 1;
122 pd
= (raid_disks
- 1) - stripe
% raid_disks
;
125 return (pd
+ 1 + block
) % raid_disks
;
127 case 600 + ALGORITHM_RIGHT_SYMMETRIC_6
:
129 return raid_disks
- 1;
131 pd
= stripe
% raid_disks
;
134 return (pd
+ 1 + block
) % raid_disks
;
136 case 600 + ALGORITHM_PARITY_0_6
:
138 return raid_disks
- 1;
141 case 600 + ALGORITHM_PARITY_0
:
148 case 600 + ALGORITHM_LEFT_ASYMMETRIC
:
149 pd
= raid_disks
- 1 - (stripe
% raid_disks
);
153 return (pd
+1) % raid_disks
;
154 if (pd
== raid_disks
- 1)
160 case 600 + ALGORITHM_ROTATING_ZERO_RESTART
:
161 /* Different order for calculating Q, otherwize same as ... */
162 case 600 + ALGORITHM_RIGHT_ASYMMETRIC
:
163 pd
= stripe
% raid_disks
;
167 return (pd
+1) % raid_disks
;
168 if (pd
== raid_disks
- 1)
174 case 600 + ALGORITHM_LEFT_SYMMETRIC
:
175 pd
= raid_disks
- 1 - (stripe
% raid_disks
);
179 return (pd
+1) % raid_disks
;
180 return (pd
+ 2 + block
) % raid_disks
;
182 case 600 + ALGORITHM_RIGHT_SYMMETRIC
:
183 pd
= stripe
% raid_disks
;
187 return (pd
+1) % raid_disks
;
188 return (pd
+ 2 + block
) % raid_disks
;
190 case 600 + ALGORITHM_ROTATING_N_RESTART
:
191 /* Same a left_asymmetric, by first stripe is
192 * D D D P Q rather than
195 pd
= raid_disks
- 1 - ((stripe
+ 1) % raid_disks
);
199 return (pd
+1) % raid_disks
;
200 if (pd
== raid_disks
- 1)
206 case 600 + ALGORITHM_ROTATING_N_CONTINUE
:
207 /* Same as left_symmetric but Q is before P */
208 pd
= raid_disks
- 1 - (stripe
% raid_disks
);
212 return (pd
+raid_disks
-1) % raid_disks
;
213 return (pd
+ 1 + block
) % raid_disks
;
218 int is_ddf(int layout
)
224 case ALGORITHM_ROTATING_N_CONTINUE
:
225 case ALGORITHM_ROTATING_N_RESTART
:
226 case ALGORITHM_ROTATING_ZERO_RESTART
:
231 void xor_blocks(char *target
, char **sources
, int disks
, int size
)
234 /* Amazingly inefficient... */
235 for (i
=0; i
<size
; i
++) {
237 for (j
=0 ; j
<disks
; j
++)
243 void qsyndrome(uint8_t *p
, uint8_t *q
, uint8_t **sources
, int disks
, int size
)
246 uint8_t wq0
, wp0
, wd0
, w10
, w20
;
247 for ( d
= 0; d
< size
; d
++) {
248 wq0
= wp0
= sources
[disks
-1][d
];
249 for ( z
= disks
-2 ; z
>= 0 ; z
-- ) {
252 w20
= (wq0
&0x80) ? 0xff : 0x00;
253 w10
= (wq0
<< 1) & 0xff;
264 * The following was taken from linux/drivers/md/mktables.c, and modified
265 * to create in-memory tables rather than C code
267 static uint8_t gfmul(uint8_t a
, uint8_t b
)
274 a
= (a
<< 1) ^ (a
& 0x80 ? 0x1d : 0);
281 static uint8_t gfpow(uint8_t a
, int b
)
299 int tables_ready
= 0;
300 uint8_t raid6_gfmul
[256][256];
301 uint8_t raid6_gfexp
[256];
302 uint8_t raid6_gfinv
[256];
303 uint8_t raid6_gfexi
[256];
304 uint8_t raid6_gflog
[256];
305 uint8_t raid6_gfilog
[256];
306 void make_tables(void)
312 /* Compute multiplication table */
313 for (i
= 0; i
< 256; i
++)
314 for (j
= 0; j
< 256; j
++)
315 raid6_gfmul
[i
][j
] = gfmul(i
, j
);
317 /* Compute power-of-2 table (exponent) */
319 for (i
= 0; i
< 256; i
++) {
323 v
= 0; /* For entry 255, not a real entry */
326 /* Compute inverse table x^-1 == x^254 */
327 for (i
= 0; i
< 256; i
++)
328 raid6_gfinv
[i
] = gfpow(i
, 254);
330 /* Compute inv(2^x + 1) (exponent-xor-inverse) table */
331 for (i
= 0; i
< 256; i
++)
332 raid6_gfexi
[i
] = raid6_gfinv
[raid6_gfexp
[i
] ^ 1];
334 /* Compute log and inverse log */
335 /* Modified code from:
336 * https://web.eecs.utk.edu/~plank/plank/papers/CS-96-332.html
340 raid6_gfilog
[255] = 0;
342 for (log
= 0; log
< 255; log
++) {
343 raid6_gflog
[b
] = (uint8_t) log
;
344 raid6_gfilog
[log
] = (uint8_t) b
;
346 if (b
& 256) b
= b
^ 0435;
355 void ensure_zero_has_size(int chunk_size
)
357 if (zero
== NULL
|| chunk_size
> zero_size
) {
360 zero
= xcalloc(1, chunk_size
);
361 zero_size
= chunk_size
;
365 /* Following was taken from linux/drivers/md/raid6recov.c */
367 /* Recover two failed data blocks. */
369 void raid6_2data_recov(int disks
, size_t bytes
, int faila
, int failb
,
370 uint8_t **ptrs
, int neg_offset
)
372 uint8_t *p
, *q
, *dp
, *dq
;
374 const uint8_t *pbmul
; /* P multiplier table for B data */
375 const uint8_t *qmul
; /* Q multiplier table (for both) */
391 /* Compute syndrome with zero for the missing data pages
392 Use the dead data pages as temporary storage for
393 delta p and delta q */
399 qsyndrome(dp
, dq
, ptrs
, disks
-2, bytes
);
401 /* Restore pointer table */
405 /* Now, pick the proper data tables */
406 pbmul
= raid6_gfmul
[raid6_gfexi
[failb
-faila
]];
407 qmul
= raid6_gfmul
[raid6_gfinv
[raid6_gfexp
[faila
]^raid6_gfexp
[failb
]]];
413 *dq
++ = db
= pbmul
[px
] ^ qx
; /* Reconstructed B */
414 *dp
++ = db
^ px
; /* Reconstructed A */
419 /* Recover failure of one data block plus the P block */
420 void raid6_datap_recov(int disks
, size_t bytes
, int faila
, uint8_t **ptrs
,
424 const uint8_t *qmul
; /* Q multiplier table */
434 /* Compute syndrome with zero for the missing data page
435 Use the dead data page as temporary storage for delta q */
439 qsyndrome(p
, dq
, ptrs
, disks
-2, bytes
);
441 /* Restore pointer table */
444 /* Now, pick the proper data tables */
445 qmul
= raid6_gfmul
[raid6_gfinv
[raid6_gfexp
[faila
]]];
449 *p
++ ^= *dq
= qmul
[*q
^ *dq
];
454 /* Try to find out if a specific disk has a problem */
455 int raid6_check_disks(int data_disks
, int start
, int chunk_size
,
456 int level
, int layout
, int diskP
, int diskQ
,
457 uint8_t *p
, uint8_t *q
, char **stripes
)
462 int curr_broken_disk
= -1;
463 int prev_broken_disk
= -1;
464 int broken_status
= 0;
466 for(i
= 0; i
< chunk_size
; i
++) {
467 Px
= (uint8_t)stripes
[diskP
][i
] ^ (uint8_t)p
[i
];
468 Qx
= (uint8_t)stripes
[diskQ
][i
] ^ (uint8_t)q
[i
];
470 if((Px
!= 0) && (Qx
== 0))
471 curr_broken_disk
= diskP
;
473 if((Px
== 0) && (Qx
!= 0))
474 curr_broken_disk
= diskQ
;
476 if((Px
!= 0) && (Qx
!= 0)) {
477 data_id
= (raid6_gflog
[Qx
] - raid6_gflog
[Px
]);
478 if(data_id
< 0) data_id
+= 255;
479 diskD
= geo_map(data_id
, start
/chunk_size
,
480 data_disks
+ 2, level
, layout
);
481 curr_broken_disk
= diskD
;
484 if((Px
== 0) && (Qx
== 0))
485 curr_broken_disk
= prev_broken_disk
;
487 if(curr_broken_disk
>= data_disks
+ 2)
490 switch(broken_status
) {
492 if(curr_broken_disk
!= -1) {
493 prev_broken_disk
= curr_broken_disk
;
499 if(curr_broken_disk
!= prev_broken_disk
)
505 curr_broken_disk
= prev_broken_disk
= -2;
510 return curr_broken_disk
;
513 /*******************************************************************************
514 * Function: save_stripes
516 * Function reads data (only data without P and Q) from array and writes
517 * it to buf and opcjonaly to backup files
519 * source : A list of 'fds' of the active disks.
521 * offsets : A list of offsets on disk belonging
522 * to the array [bytes]
523 * raid_disks : geometry: number of disks in the array
524 * chunk_size : geometry: chunk size [bytes]
525 * level : geometry: RAID level
526 * layout : geometry: layout
527 * nwrites : number of backup files
528 * dest : A list of 'fds' for mirrored targets
529 * (e.g. backup files). They are already seeked to right
530 * (write) location. If NULL, data will be wrote
532 * start : start address of data to read (must be stripe-aligned)
534 * length - : length of data to read (must be stripe-aligned)
536 * buf : buffer for data. It is large enough to hold
537 * one stripe. It is stripe aligned
541 ******************************************************************************/
542 int save_stripes(int *source
, unsigned long long *offsets
,
543 int raid_disks
, int chunk_size
, int level
, int layout
,
544 int nwrites
, int *dest
,
545 unsigned long long start
, unsigned long long length
,
549 int data_disks
= raid_disks
- (level
== 0 ? 0 : level
<=5 ? 1 : 2);
552 unsigned long long length_test
;
556 ensure_zero_has_size(chunk_size
);
558 len
= data_disks
* chunk_size
;
559 length_test
= length
/ len
;
562 if (length
!= length_test
) {
563 dprintf("Error: save_stripes(): Data are not alligned. EXIT\n");
564 dprintf("\tArea for saving stripes (length) = %llu\n", length
);
565 dprintf("\tWork step (len) = %i\n", len
);
566 dprintf("\tExpected save area (length_test) = %llu\n",
573 int fdisk
[3], fblock
[3];
574 for (disk
= 0; disk
< raid_disks
; disk
++) {
575 unsigned long long offset
;
578 offset
= (start
/chunk_size
/data_disks
)*chunk_size
;
579 dnum
= geo_map(disk
< data_disks
? disk
: data_disks
- disk
- 1,
580 start
/chunk_size
/data_disks
,
581 raid_disks
, level
, layout
);
582 if (dnum
< 0) abort();
583 if (source
[dnum
] < 0 ||
584 lseek64(source
[dnum
],
585 offsets
[dnum
] + offset
, 0) < 0 ||
586 read(source
[dnum
], buf
+disk
* chunk_size
,
587 chunk_size
) != chunk_size
) {
589 fdisk
[failed
] = dnum
;
590 fblock
[failed
] = disk
;
595 if (failed
== 0 || fblock
[0] >= data_disks
)
596 /* all data disks are good */
598 else if (failed
== 1 || fblock
[1] >= data_disks
+1) {
599 /* one failed data disk and good parity */
600 char *bufs
[data_disks
];
601 for (i
=0; i
< data_disks
; i
++)
603 bufs
[i
] = buf
+ data_disks
*chunk_size
;
605 bufs
[i
] = buf
+ i
*chunk_size
;
607 xor_blocks(buf
+ fblock
[0]*chunk_size
,
608 bufs
, data_disks
, chunk_size
);
609 } else if (failed
> 2 || level
!= 6)
610 /* too much failure */
613 /* RAID6 computations needed. */
614 uint8_t *bufs
[data_disks
+4];
617 disk
= geo_map(-1, start
/chunk_size
/data_disks
,
618 raid_disks
, level
, layout
);
619 qdisk
= geo_map(-2, start
/chunk_size
/data_disks
,
620 raid_disks
, level
, layout
);
621 if (is_ddf(layout
)) {
622 /* q over 'raid_disks' blocks, in device order.
623 * 'p' and 'q' get to be all zero
625 for (i
= 0; i
< raid_disks
; i
++)
627 for (i
= 0; i
< data_disks
; i
++) {
628 int dnum
= geo_map(i
,
629 start
/chunk_size
/data_disks
,
630 raid_disks
, level
, layout
);
632 /* i is the logical block number, so is index to 'buf'.
633 * dnum is physical disk number
634 * and thus the syndrome number.
637 bufs
[snum
] = (uint8_t*)buf
+ chunk_size
* i
;
639 syndrome_disks
= raid_disks
;
641 /* for md, q is over 'data_disks' blocks,
642 * starting immediately after 'q'
643 * Note that for the '_6' variety, the p block
644 * makes a hole that we need to be careful of.
648 for (j
= 0; j
< raid_disks
; j
++) {
649 int dnum
= (qdisk
+ 1 + j
) % raid_disks
;
650 if (dnum
== disk
|| dnum
== qdisk
)
652 for (i
= 0; i
< data_disks
; i
++)
654 start
/chunk_size
/data_disks
,
655 raid_disks
, level
, layout
) == dnum
)
657 /* i is the logical block number, so is index to 'buf'.
658 * dnum is physical disk number
659 * snum is syndrome disk for which 0 is immediately after Q
661 bufs
[snum
] = (uint8_t*)buf
+ chunk_size
* i
;
670 syndrome_disks
= data_disks
;
673 /* Place P and Q blocks at end of bufs */
674 bufs
[syndrome_disks
] = (uint8_t*)buf
+ chunk_size
* data_disks
;
675 bufs
[syndrome_disks
+1] = (uint8_t*)buf
+ chunk_size
* (data_disks
+1);
677 if (fblock
[1] == data_disks
)
678 /* One data failed, and parity failed */
679 raid6_datap_recov(syndrome_disks
+2, chunk_size
,
682 /* Two data blocks failed, P,Q OK */
683 raid6_2data_recov(syndrome_disks
+2, chunk_size
,
684 fdisk
[0], fdisk
[1], bufs
, 0);
688 for (i
= 0; i
< nwrites
; i
++)
689 if (write(dest
[i
], buf
, len
) != len
)
692 /* build next stripe in buffer */
703 * A list of 'fds' of the active disks. Some may be '-1' for not-available.
704 * A geometry: raid_disks, chunk_size, level, layout
705 * An 'fd' to read from. It is already seeked to the right (Read) location.
706 * A start and length.
707 * The length must be a multiple of the stripe size.
709 * We build a full stripe in memory and then write it out.
710 * We assume that there are enough working devices.
712 int restore_stripes(int *dest
, unsigned long long *offsets
,
713 int raid_disks
, int chunk_size
, int level
, int layout
,
714 int source
, unsigned long long read_offset
,
715 unsigned long long start
, unsigned long long length
,
719 char **stripes
= xmalloc(raid_disks
* sizeof(char*));
720 char **blocks
= xmalloc(raid_disks
* sizeof(char*));
724 int data_disks
= raid_disks
- (level
== 0 ? 0 : level
<= 5 ? 1 : 2);
726 if (posix_memalign((void**)&stripe_buf
, 4096, raid_disks
* chunk_size
))
729 if (zero
== NULL
|| chunk_size
> zero_size
) {
732 zero
= xcalloc(1, chunk_size
);
733 zero_size
= chunk_size
;
736 if (stripe_buf
== NULL
|| stripes
== NULL
|| blocks
== NULL
||
741 for (i
= 0; i
< raid_disks
; i
++)
742 stripes
[i
] = stripe_buf
+ i
* chunk_size
;
744 unsigned int len
= data_disks
* chunk_size
;
745 unsigned long long offset
;
752 for (i
= 0; i
< data_disks
; i
++) {
753 int disk
= geo_map(i
, start
/chunk_size
/data_disks
,
754 raid_disks
, level
, layout
);
755 if (src_buf
== NULL
) {
757 if (lseek64(source
, read_offset
, 0) !=
758 (off64_t
)read_offset
) {
764 chunk_size
) != chunk_size
) {
769 /* read from input buffer */
770 memcpy(stripes
[disk
],
771 src_buf
+ read_offset
,
774 read_offset
+= chunk_size
;
776 /* We have the data, now do the parity */
777 offset
= (start
/chunk_size
/data_disks
) * chunk_size
;
781 disk
= geo_map(-1, start
/chunk_size
/data_disks
,
782 raid_disks
, level
, layout
);
783 for (i
= 0; i
< data_disks
; i
++)
784 blocks
[i
] = stripes
[(disk
+1+i
) % raid_disks
];
785 xor_blocks(stripes
[disk
], blocks
, data_disks
, chunk_size
);
788 disk
= geo_map(-1, start
/chunk_size
/data_disks
,
789 raid_disks
, level
, layout
);
790 qdisk
= geo_map(-2, start
/chunk_size
/data_disks
,
791 raid_disks
, level
, layout
);
792 if (is_ddf(layout
)) {
793 /* q over 'raid_disks' blocks, in device order.
794 * 'p' and 'q' get to be all zero
796 for (i
= 0; i
< raid_disks
; i
++)
797 if (i
== disk
|| i
== qdisk
)
798 blocks
[i
] = (char*)zero
;
800 blocks
[i
] = stripes
[i
];
801 syndrome_disks
= raid_disks
;
803 /* for md, q is over 'data_disks' blocks,
804 * starting immediately after 'q'
806 for (i
= 0; i
< data_disks
; i
++)
807 blocks
[i
] = stripes
[(qdisk
+1+i
) % raid_disks
];
809 syndrome_disks
= data_disks
;
811 qsyndrome((uint8_t*)stripes
[disk
],
812 (uint8_t*)stripes
[qdisk
],
814 syndrome_disks
, chunk_size
);
817 for (i
=0; i
< raid_disks
; i
++)
820 offsets
[i
]+offset
, 0) < 0) {
824 if (write(dest
[i
], stripes
[i
],
825 chunk_size
) != chunk_size
) {
844 int test_stripes(int *source
, unsigned long long *offsets
,
845 int raid_disks
, int chunk_size
, int level
, int layout
,
846 unsigned long long start
, unsigned long long length
)
848 /* ready the data and p (and q) blocks, and check we got them right */
849 char *stripe_buf
= xmalloc(raid_disks
* chunk_size
);
850 char **stripes
= xmalloc(raid_disks
* sizeof(char*));
851 char **blocks
= xmalloc(raid_disks
* sizeof(char*));
852 uint8_t *p
= xmalloc(chunk_size
);
853 uint8_t *q
= xmalloc(chunk_size
);
857 int data_disks
= raid_disks
- (level
== 5 ? 1: 2);
862 for ( i
= 0 ; i
< raid_disks
; i
++)
863 stripes
[i
] = stripe_buf
+ i
* chunk_size
;
868 for (i
= 0 ; i
< raid_disks
; i
++) {
869 if ((lseek64(source
[i
], offsets
[i
]+start
, 0) < 0) ||
870 (read(source
[i
], stripes
[i
], chunk_size
) !=
880 for (i
= 0 ; i
< data_disks
; i
++) {
881 int disk
= geo_map(i
, start
/chunk_size
, raid_disks
,
883 blocks
[i
] = stripes
[disk
];
884 printf("%d->%d\n", i
, disk
);
888 qsyndrome(p
, q
, (uint8_t**)blocks
, data_disks
, chunk_size
);
889 diskP
= geo_map(-1, start
/chunk_size
, raid_disks
,
891 if (memcmp(p
, stripes
[diskP
], chunk_size
) != 0) {
892 printf("P(%d) wrong at %llu\n", diskP
,
895 diskQ
= geo_map(-2, start
/chunk_size
, raid_disks
,
897 if (memcmp(q
, stripes
[diskQ
], chunk_size
) != 0) {
898 printf("Q(%d) wrong at %llu\n", diskQ
,
901 disk
= raid6_check_disks(data_disks
, start
, chunk_size
,
902 level
, layout
, diskP
, diskQ
,
905 printf("Possible failed disk: %d\n", disk
);
908 printf("Failure detected, but disk unknown\n");
912 length
-= chunk_size
;
918 unsigned long long getnum(char *str
, char **err
)
921 unsigned long long rv
= strtoull(str
, &e
, 10);
929 char const Name
[] = "test_restripe";
930 int main(int argc
, char *argv
[])
932 /* save/restore file raid_disks chunk_size level layout start length devices...
939 unsigned long long *offsets
;
940 int raid_disks
, chunk_size
, level
, layout
;
941 unsigned long long start
, length
;
946 fprintf(stderr
, "Usage: test_stripe save/restore file raid_disks chunk_size level layout start length devices...\n");
949 if (strcmp(argv
[1], "save")==0)
951 else if (strcmp(argv
[1], "restore") == 0)
953 else if (strcmp(argv
[1], "test") == 0)
956 fprintf(stderr
, "test_stripe: must give 'save' or 'restore'.\n");
961 raid_disks
= getnum(argv
[3], &err
);
962 chunk_size
= getnum(argv
[4], &err
);
963 level
= getnum(argv
[5], &err
);
964 layout
= getnum(argv
[6], &err
);
965 start
= getnum(argv
[7], &err
);
966 length
= getnum(argv
[8], &err
);
968 fprintf(stderr
, "test_stripe: Bad number: %s\n", err
);
971 if (argc
!= raid_disks
+ 9) {
972 fprintf(stderr
, "test_stripe: wrong number of devices: want %d found %d\n",
976 fds
= xmalloc(raid_disks
* sizeof(*fds
));
977 offsets
= xcalloc(raid_disks
, sizeof(*offsets
));
979 storefd
= open(file
, O_RDWR
);
982 fprintf(stderr
, "test_stripe: could not open %s.\n", file
);
985 for (i
=0; i
<raid_disks
; i
++) {
987 p
= strchr(argv
[9+i
], ':');
991 offsets
[i
] = atoll(p
) * 512;
994 fds
[i
] = open(argv
[9+i
], O_RDWR
);
997 fprintf(stderr
,"test_stripe: cannot open %s.\n", argv
[9+i
]);
1002 buf
= xmalloc(raid_disks
* chunk_size
);
1005 int rv
= save_stripes(fds
, offsets
,
1006 raid_disks
, chunk_size
, level
, layout
,
1008 start
, length
, buf
);
1011 "test_stripe: save_stripes returned %d\n", rv
);
1014 } else if (save
== 2) {
1015 int rv
= test_stripes(fds
, offsets
,
1016 raid_disks
, chunk_size
, level
, layout
,
1020 "test_stripe: test_stripes returned %d\n", rv
);
1024 int rv
= restore_stripes(fds
, offsets
,
1025 raid_disks
, chunk_size
, level
, layout
,
1027 start
, length
, NULL
);
1030 "test_stripe: restore_stripes returned %d\n",