#include "mdadm.h"
#include <stdint.h>
+#include <signal.h>
+#include <sys/mman.h>
+
+enum repair {
+ NO_REPAIR = 0,
+ MANUAL_REPAIR,
+ AUTO_REPAIR
+};
int geo_map(int block, unsigned long long stripe, int raid_disks,
int level, int layout);
void qsyndrome(uint8_t *p, uint8_t *q, uint8_t **sources, int disks, int size);
void make_tables(void);
+void ensure_zero_has_size(int chunk_size);
+void raid6_datap_recov(int disks, size_t bytes, int faila, uint8_t **ptrs);
+void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
+ uint8_t **ptrs);
+void xor_blocks(char *target, char **sources, int disks, int size);
/* Collect per stripe consistency information */
void raid6_collect(int chunk_size, uint8_t *p, uint8_t *q,
return curr_broken_disk;
}
-int check_stripes(int *source, unsigned long long *offsets,
+int lock_stripe(struct mdinfo *info, unsigned long long start,
+ int chunk_size, int data_disks, sighandler_t *sig) {
+ int rv;
+ if(mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
+ return 2;
+ }
+
+ sig[0] = signal(SIGTERM, SIG_IGN);
+ sig[1] = signal(SIGINT, SIG_IGN);
+ sig[2] = signal(SIGQUIT, SIG_IGN);
+
+ rv = sysfs_set_num(info, NULL, "suspend_lo", start * chunk_size * data_disks);
+ rv |= sysfs_set_num(info, NULL, "suspend_hi", (start + 1) * chunk_size * data_disks);
+ return rv * 256;
+}
+
+int unlock_all_stripes(struct mdinfo *info, sighandler_t *sig) {
+ int rv;
+ rv = sysfs_set_num(info, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
+ rv |= sysfs_set_num(info, NULL, "suspend_hi", 0);
+ rv |= sysfs_set_num(info, NULL, "suspend_lo", 0);
+
+ signal(SIGQUIT, sig[2]);
+ signal(SIGINT, sig[1]);
+ signal(SIGTERM, sig[0]);
+
+ if(munlockall() != 0)
+ return 3;
+ return rv * 256;
+}
+
+int check_stripes(struct mdinfo *info, int *source, unsigned long long *offsets,
int raid_disks, int chunk_size, int level, int layout,
- unsigned long long start, unsigned long long length, char *name[])
+ unsigned long long start, unsigned long long length, char *name[],
+ enum repair repair, int failed_disk1, int failed_disk2)
{
/* read the data and p and q blocks, and check we got them right */
- char *stripe_buf = malloc(raid_disks * chunk_size);
- char **stripes = malloc(raid_disks * sizeof(char*));
- char **blocks = malloc(raid_disks * sizeof(char*));
- uint8_t *p = malloc(chunk_size);
- uint8_t *q = malloc(chunk_size);
- int *results = malloc(chunk_size * sizeof(int));
+ char *stripe_buf = xmalloc(raid_disks * chunk_size);
+ char **stripes = xmalloc(raid_disks * sizeof(char*));
+ char **blocks = xmalloc(raid_disks * sizeof(char*));
+ int *block_index_for_slot = xmalloc(raid_disks * sizeof(int));
+ uint8_t *p = xmalloc(chunk_size);
+ uint8_t *q = xmalloc(chunk_size);
+ int *results = xmalloc(chunk_size * sizeof(int));
+ sighandler_t *sig = xmalloc(3 * sizeof(sighandler_t));
int i;
int diskP, diskQ;
extern int tables_ready;
- if((stripe_buf == NULL) ||
- (stripes == NULL) ||
- (blocks == NULL) ||
- (p == NULL) ||
- (q == NULL) ||
- (results == NULL)) {
- err = 1;
- goto exitCheck;
- }
-
if (!tables_ready)
make_tables();
printf("pos --> %llu\n", start);
+ err = lock_stripe(info, start, chunk_size, data_disks, sig);
+ if(err != 0) {
+ if (err != 2)
+ unlock_all_stripes(info, sig);
+ goto exitCheck;
+ }
for (i = 0 ; i < raid_disks ; i++) {
- lseek64(source[i], offsets[i] + start * chunk_size, 0);
- read(source[i], stripes[i], chunk_size);
+ off64_t seek_res = lseek64(source[i], offsets[i] + start * chunk_size,
+ SEEK_SET);
+ if (seek_res < 0) {
+ fprintf(stderr, "lseek to source %d failed\n", i);
+ unlock_all_stripes(info, sig);
+ err = -1;
+ goto exitCheck;
+ }
+ int read_res = read(source[i], stripes[i], chunk_size);
+ if (read_res < chunk_size) {
+ fprintf(stderr, "Failed to read complete chunk disk %d, aborting\n", i);
+ unlock_all_stripes(info, sig);
+ err = -1;
+ goto exitCheck;
+ }
}
+ err = unlock_all_stripes(info, sig);
+ if(err != 0)
+ goto exitCheck;
+
for (i = 0 ; i < data_disks ; i++) {
int disk = geo_map(i, start, raid_disks, level, layout);
blocks[i] = stripes[disk];
+ block_index_for_slot[disk] = i;
printf("%d->%d\n", i, disk);
}
qsyndrome(p, q, (uint8_t**)blocks, data_disks, chunk_size);
diskP = geo_map(-1, start, raid_disks, level, layout);
+ diskQ = geo_map(-2, start, raid_disks, level, layout);
+ blocks[data_disks] = stripes[diskP];
+ block_index_for_slot[diskP] = data_disks;
+ blocks[data_disks+1] = stripes[diskQ];
+ block_index_for_slot[diskQ] = data_disks+1;
+
if (memcmp(p, stripes[diskP], chunk_size) != 0) {
printf("P(%d) wrong at %llu\n", diskP, start);
}
- diskQ = geo_map(-2, start, raid_disks, level, layout);
if (memcmp(q, stripes[diskQ], chunk_size) != 0) {
printf("Q(%d) wrong at %llu\n", diskQ, start);
}
if(disk == -65535) {
printf("Error detected at %llu: disk slot unknown\n", start);
}
+ if(repair == MANUAL_REPAIR) {
+ printf("Repairing stripe %llu\n", start);
+ printf("Assuming slots %d (%s) and %d (%s) are incorrect\n",
+ failed_disk1, name[failed_disk1],
+ failed_disk2, name[failed_disk2]);
+
+ if (failed_disk1 == diskQ || failed_disk2 == diskQ) {
+ char *all_but_failed_blocks[data_disks];
+ int failed_data_or_p;
+ int failed_block_index;
+
+ if (failed_disk1 == diskQ)
+ failed_data_or_p = failed_disk2;
+ else
+ failed_data_or_p = failed_disk1;
+ printf("Repairing D/P(%d) and Q\n", failed_data_or_p);
+ failed_block_index = block_index_for_slot[failed_data_or_p];
+ for (i=0; i < data_disks; i++)
+ if (failed_block_index == i)
+ all_but_failed_blocks[i] = stripes[diskP];
+ else
+ all_but_failed_blocks[i] = blocks[i];
+ xor_blocks(stripes[failed_data_or_p],
+ all_but_failed_blocks, data_disks, chunk_size);
+ qsyndrome(p, (uint8_t*)stripes[diskQ], (uint8_t**)blocks, data_disks, chunk_size);
+ } else {
+ ensure_zero_has_size(chunk_size);
+ if (failed_disk1 == diskP || failed_disk2 == diskP) {
+ int failed_data, failed_block_index;
+ if (failed_disk1 == diskP)
+ failed_data = failed_disk2;
+ else
+ failed_data = failed_disk1;
+ failed_block_index = block_index_for_slot[failed_data];
+ printf("Repairing D(%d) and P\n", failed_data);
+ raid6_datap_recov(raid_disks, chunk_size, failed_block_index, (uint8_t**)blocks);
+ } else {
+ printf("Repairing D and D\n");
+ int failed_block_index1 = block_index_for_slot[failed_disk1];
+ int failed_block_index2 = block_index_for_slot[failed_disk2];
+ if (failed_block_index1 > failed_block_index2) {
+ int t = failed_block_index1;
+ failed_block_index1 = failed_block_index2;
+ failed_block_index2 = t;
+ }
+ raid6_2data_recov(raid_disks, chunk_size, failed_block_index1, failed_block_index2, (uint8_t**)blocks);
+ }
+ }
+
+ err = lock_stripe(info, start, chunk_size, data_disks, sig);
+ if(err != 0) {
+ if (err != 2)
+ unlock_all_stripes(info, sig);
+ goto exitCheck;
+ }
+
+ int write_res1, write_res2;
+ off64_t seek_res;
+
+ seek_res = lseek64(source[failed_disk1],
+ offsets[failed_disk1] + start * chunk_size, SEEK_SET);
+ if (seek_res < 0) {
+ fprintf(stderr, "lseek failed for failed_disk1\n");
+ unlock_all_stripes(info, sig);
+ err = -1;
+ goto exitCheck;
+ }
+ write_res1 = write(source[failed_disk1], stripes[failed_disk1], chunk_size);
+
+ seek_res = lseek64(source[failed_disk2],
+ offsets[failed_disk2] + start * chunk_size, SEEK_SET);
+ if (seek_res < 0) {
+ fprintf(stderr, "lseek failed for failed_disk1\n");
+ unlock_all_stripes(info, sig);
+ err = -1;
+ goto exitCheck;
+ }
+ write_res2 = write(source[failed_disk2], stripes[failed_disk2], chunk_size);
+
+ err = unlock_all_stripes(info, sig);
+ if(err != 0)
+ goto exitCheck;
+
+ if (write_res1 != chunk_size || write_res2 != chunk_size) {
+ fprintf(stderr, "Failed to write a complete chunk.\n");
+ goto exitCheck;
+ }
+
+ } else if (disk >= 0 && repair == AUTO_REPAIR) {
+ printf("Auto-repairing slot %d (%s)\n", disk, name[disk]);
+ if (disk == diskQ) {
+ qsyndrome(p, (uint8_t*)stripes[diskQ], (uint8_t**)blocks, data_disks, chunk_size);
+ } else {
+ char *all_but_failed_blocks[data_disks];
+ int failed_block_index = block_index_for_slot[disk];
+ for (i=0; i < data_disks; i++)
+ if (failed_block_index == i)
+ all_but_failed_blocks[i] = stripes[diskP];
+ else
+ all_but_failed_blocks[i] = blocks[i];
+ xor_blocks(stripes[disk],
+ all_but_failed_blocks, data_disks, chunk_size);
+ }
+
+ err = lock_stripe(info, start, chunk_size, data_disks, sig);
+ if(err != 0) {
+ if (err != 2)
+ unlock_all_stripes(info, sig);
+ goto exitCheck;
+ }
+
+ lseek64(source[disk], offsets[disk] + start * chunk_size, 0);
+ int write_res = write(source[disk], stripes[disk], chunk_size);
+
+ err = unlock_all_stripes(info, sig);
+ if(err != 0 || write_res != chunk_size)
+ goto exitCheck;
+
+ if (write_res != chunk_size) {
+ fprintf(stderr, "Failed to write a full chunk.\n");
+ goto exitCheck;
+ }
+ }
length--;
start++;
free(stripe_buf);
free(stripes);
free(blocks);
+ free(block_index_for_slot);
free(p);
free(q);
free(results);
+ free(sig);
return err;
}
char **disk_name = NULL;
unsigned long long *offsets = NULL;
int raid_disks = 0;
+ int active_disks;
int chunk_size = 0;
int layout = -1;
int level = 6;
+ enum repair repair = NO_REPAIR;
+ int failed_disk1 = -1;
+ int failed_disk2 = -1;
unsigned long long start, length;
int i;
int mdfd;
- struct mdinfo *info, *comp;
+ struct mdinfo *info = NULL, *comp = NULL;
char *err = NULL;
int exit_err = 0;
int close_flag = 0;
prg++;
if (argc < 4) {
- fprintf(stderr, "Usage: %s md_device start_stripe length_stripes\n", prg);
+ fprintf(stderr, "Usage: %s md_device start_stripe length_stripes [autorepair]\n", prg);
+ fprintf(stderr, " or: %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
exit_err = 1;
goto exitHere;
}
mdfd = open(argv[1], O_RDONLY);
if(mdfd < 0) {
perror(argv[1]);
- fprintf(stderr,"%s: cannot open %s\n", prg, argv[1]);
+ fprintf(stderr, "%s: cannot open %s\n", prg, argv[1]);
exit_err = 2;
goto exitHere;
}
- info = sysfs_read(mdfd, -1,
+ info = sysfs_read(mdfd, NULL,
GET_LEVEL|
GET_LAYOUT|
GET_DISKS|
+ GET_DEGRADED |
GET_COMPONENT|
GET_CHUNK|
GET_DEVS|
GET_OFFSET|
GET_SIZE);
+ if(info == NULL) {
+ fprintf(stderr, "%s: Error reading sysfs information of %s\n", prg, argv[1]);
+ exit_err = 9;
+ goto exitHere;
+ }
+
if(info->array.level != level) {
fprintf(stderr, "%s: %s not a RAID-6\n", prg, argv[1]);
exit_err = 3;
goto exitHere;
}
+ if(info->array.failed_disks > 0) {
+ fprintf(stderr, "%s: %s degraded array\n", prg, argv[1]);
+ exit_err = 8;
+ goto exitHere;
+ }
+
printf("layout: %d\n", info->array.layout);
printf("disks: %d\n", info->array.raid_disks);
printf("component size: %llu\n", info->component_size * 512);
printf("\n");
comp = info->devs;
- for(i = 0; i < info->array.raid_disks; i++) {
+ for(i = 0, active_disks = 0; active_disks < info->array.raid_disks; i++) {
printf("disk: %d - offset: %llu - size: %llu - name: %s - slot: %d\n",
i, comp->data_offset * 512, comp->component_size * 512,
map_dev(comp->disk.major, comp->disk.minor, 0),
comp->disk.raid_disk);
-
+ if(comp->disk.raid_disk >= 0)
+ active_disks++;
comp = comp->next;
}
printf("\n");
raid_disks = info->array.raid_disks;
chunk_size = info->array.chunk_size;
layout = info->array.layout;
- start = getnum(argv[2], &err);
- length = getnum(argv[3], &err);
+ if (strcmp(argv[2], "repair")==0) {
+ if (argc < 6) {
+ fprintf(stderr, "For repair mode, call %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
+ exit_err = 1;
+ goto exitHere;
+ }
+ repair = MANUAL_REPAIR;
+ start = getnum(argv[3], &err);
+ length = 1;
+ failed_disk1 = getnum(argv[4], &err);
+ failed_disk2 = getnum(argv[5], &err);
+
+ if(failed_disk1 >= info->array.raid_disks) {
+ fprintf(stderr, "%s: failed_slot_1 index is higher than number of devices in raid\n", prg);
+ exit_err = 4;
+ goto exitHere;
+ }
+ if(failed_disk2 >= info->array.raid_disks) {
+ fprintf(stderr, "%s: failed_slot_2 index is higher than number of devices in raid\n", prg);
+ exit_err = 4;
+ goto exitHere;
+ }
+ if(failed_disk1 == failed_disk2) {
+ fprintf(stderr, "%s: failed_slot_1 and failed_slot_2 are the same\n", prg);
+ exit_err = 4;
+ goto exitHere;
+ }
+ }
+ else {
+ start = getnum(argv[2], &err);
+ length = getnum(argv[3], &err);
+ if (argc >= 5 && strcmp(argv[4], "autorepair")==0)
+ repair = AUTO_REPAIR;
+ }
if (err) {
fprintf(stderr, "%s: Bad number: %s\n", prg, err);
length = (info->component_size * 512) / chunk_size - start;
}
- disk_name = malloc(raid_disks * sizeof(*disk_name));
- fds = malloc(raid_disks * sizeof(*fds));
- offsets = malloc(raid_disks * sizeof(*offsets));
- buf = malloc(raid_disks * chunk_size);
-
- if((disk_name == NULL) ||
- (fds == NULL) ||
- (offsets == NULL) ||
- (buf == NULL)) {
- fprintf(stderr, "%s: allocation fail\n", prg);
- exit_err = 5;
- goto exitHere;
- }
+ disk_name = xmalloc(raid_disks * sizeof(*disk_name));
+ fds = xmalloc(raid_disks * sizeof(*fds));
+ offsets = xcalloc(raid_disks, sizeof(*offsets));
+ buf = xmalloc(raid_disks * chunk_size);
- memset(offsets, 0, raid_disks * sizeof(*offsets));
for(i=0; i<raid_disks; i++) {
fds[i] = -1;
}
close_flag = 1;
comp = info->devs;
- for (i=0; i<raid_disks; i++) {
+ for (i=0, active_disks=0; active_disks<raid_disks; i++) {
int disk_slot = comp->disk.raid_disk;
- disk_name[disk_slot] = map_dev(comp->disk.major, comp->disk.minor, 0);
- offsets[disk_slot] = comp->data_offset * 512;
- fds[disk_slot] = open(disk_name[disk_slot], O_RDWR);
- if (fds[disk_slot] < 0) {
- perror(disk_name[disk_slot]);
- fprintf(stderr,"%s: cannot open %s\n", prg, disk_name[disk_slot]);
- exit_err = 6;
- goto exitHere;
+ if(disk_slot >= 0) {
+ disk_name[disk_slot] = map_dev(comp->disk.major, comp->disk.minor, 0);
+ offsets[disk_slot] = comp->data_offset * 512;
+ fds[disk_slot] = open(disk_name[disk_slot], O_RDWR);
+ if (fds[disk_slot] < 0) {
+ perror(disk_name[disk_slot]);
+ fprintf(stderr,"%s: cannot open %s\n", prg, disk_name[disk_slot]);
+ exit_err = 6;
+ goto exitHere;
+ }
+ active_disks++;
}
-
comp = comp->next;
}
- int rv = check_stripes(fds, offsets,
+ int rv = check_stripes(info, fds, offsets,
raid_disks, chunk_size, level, layout,
- start, length, disk_name);
+ start, length, disk_name, repair, failed_disk1, failed_disk2);
if (rv != 0) {
fprintf(stderr,
"%s: check_stripes returned %d\n", prg, rv);
projects / thirdparty / mdadm.git / blobdiff