RAID-6 check standalone md device
Allow RAID-6 check to be passed only the MD device, start and length. The three parameters are mandatory. All necessary information is collected using the "sysfs_read()" call. Furthermore, if "length" is "0", then the check is performed until the end of the array. Some checks are done, for example if the md device is really a RAID-6. Nevertheless I guess it is not bullet proof... Next patch will include the "suspend" action. My idea is to do it "per stripe", please let me know if you've some better options. Signed-off-by: NeilBrown <neilb@suse.de>
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78c0a3b17f
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6
Makefile
6
Makefile
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@ -107,7 +107,7 @@ OBJS = mdadm.o config.o policy.o mdstat.o ReadMe.o util.o maps.o lib.o \
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restripe.o sysfs.o sha1.o mapfile.o crc32.o sg_io.o msg.o \
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platform-intel.o probe_roms.o
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OBJSX = restripe.o
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CHECK_OBJS = restripe.o sysfs.o maps.o lib.o
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SRCS = $(patsubst %.o,%.c,$(OBJS))
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@ -177,8 +177,8 @@ msg.o: msg.c msg.h
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test_stripe : restripe.c mdadm.h
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$(CC) $(CXFLAGS) $(LDFLAGS) -o test_stripe -DMAIN restripe.c
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raid6check : raid6check.o mdadm.h $(OBJSX)
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$(CC) $(CXFLAGS) $(LDFLAGS) -o raid6check raid6check.o $(OBJSX)
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raid6check : raid6check.o mdadm.h $(CHECK_OBJS)
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$(CC) $(CXFLAGS) $(LDFLAGS) -o raid6check raid6check.o $(CHECK_OBJS)
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mdassemble : $(ASSEMBLE_SRCS) $(INCL)
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rm -f $(OBJS)
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110
raid6check.c
110
raid6check.c
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@ -159,7 +159,7 @@ int check_stripes(int *source, unsigned long long *offsets,
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level, layout);
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}
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if(disk >= 0) {
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printf("Possible failed disk: %d --> %s\n", disk, name[disk]);
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printf("Possible failed disk slot: %d --> %s\n", disk, name[disk]);
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}
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if(disk == -65535) {
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printf("Failure detected, but disk unknown\n");
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@ -192,71 +192,121 @@ unsigned long long getnum(char *str, char **err)
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int main(int argc, char *argv[])
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{
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/* raid_disks chunk_size layout start length devices...
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*/
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/* md_device start length */
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int *fds;
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char *buf;
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char **disk_name;
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unsigned long long *offsets;
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int raid_disks, chunk_size, layout;
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int level = 6;
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unsigned long long start, length;
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int i;
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int mdfd;
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struct mdinfo *info, *comp;
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char *err = NULL;
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if (argc < 8) {
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fprintf(stderr, "Usage: raid6check raid_disks"
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" chunk_size layout start length devices...\n");
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const char prg[] = "raid6check";
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if (argc < 3) {
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fprintf(stderr, "Usage: %s md_device start length\n", prg);
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exit(1);
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}
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raid_disks = getnum(argv[1], &err);
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chunk_size = getnum(argv[2], &err);
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layout = getnum(argv[3], &err);
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start = getnum(argv[4], &err);
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length = getnum(argv[5], &err);
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mdfd = open(argv[1], O_RDONLY);
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if(mdfd < 0) {
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perror(argv[1]);
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fprintf(stderr,"%s: cannot open %s\n", prg, argv[1]);
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exit(4);
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}
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info = sysfs_read(mdfd, -1,
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GET_LEVEL|
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GET_LAYOUT|
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GET_DISKS|
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GET_COMPONENT|
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GET_CHUNK|
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GET_DEVS|
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GET_OFFSET|
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GET_SIZE);
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if(info->array.level != level) {
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fprintf(stderr, "%s: %s not a RAID-6\n", prg, argv[1]);
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exit(5);
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}
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printf("layout: %d\n", info->array.layout);
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printf("disks: %d\n", info->array.raid_disks);
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printf("component size: %llu\n", info->component_size*512);
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printf("chunk size: %d\n", info->array.chunk_size);
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printf("\n");
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comp = info->devs;
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for(i = 0; i < info->array.raid_disks; i++) {
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printf("disk: %d - offset: %llu - size: %llu - name: %s - slot: %d\n",
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i, comp->data_offset, comp->component_size*512,
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map_dev(comp->disk.major, comp->disk.minor, 0),
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comp->disk.raid_disk);
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comp = comp->next;
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}
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printf("\n");
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close(mdfd);
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raid_disks = info->array.raid_disks;
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chunk_size = info->array.chunk_size;
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layout = info->array.layout;
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start = getnum(argv[2], &err);
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length = getnum(argv[3], &err);
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if (err) {
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fprintf(stderr, "test_stripe: Bad number: %s\n", err);
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fprintf(stderr, "%s: Bad number: %s\n", prg, err);
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exit(2);
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}
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if (argc != raid_disks + 6) {
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fprintf(stderr, "test_stripe: wrong number of devices: want %d found %d\n",
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raid_disks, argc-6);
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exit(2);
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start = (start / chunk_size) * chunk_size;
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if(length == 0) {
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length = info->component_size * 512 - start;
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}
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disk_name = malloc(raid_disks * sizeof(*disk_name));
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fds = malloc(raid_disks * sizeof(*fds));
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offsets = malloc(raid_disks * sizeof(*offsets));
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memset(offsets, 0, raid_disks * sizeof(*offsets));
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comp = info->devs;
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for (i=0; i<raid_disks; i++) {
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char *p;
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p = strchr(argv[6+i], ':');
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if(p != NULL) {
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*p++ = '\0';
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offsets[i] = atoll(p) * 512;
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}
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fds[i] = open(argv[6+i], O_RDWR);
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if (fds[i] < 0) {
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perror(argv[6+i]);
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fprintf(stderr,"test_stripe: cannot open %s.\n", argv[6+i]);
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int disk_slot = comp->disk.raid_disk;
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disk_name[disk_slot] = map_dev(comp->disk.major, comp->disk.minor, 0);
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offsets[disk_slot] = comp->data_offset * 512;
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fds[disk_slot] = open(disk_name[disk_slot], O_RDWR);
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if (fds[disk_slot] < 0) {
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perror(disk_name[disk_slot]);
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fprintf(stderr,"%s: cannot open %s\n", prg, disk_name[disk_slot]);
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exit(3);
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}
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comp = comp->next;
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}
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buf = malloc(raid_disks * chunk_size);
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int rv = check_stripes(fds, offsets,
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raid_disks, chunk_size, level, layout,
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start, length, &argv[6]);
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start, length, disk_name);
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if (rv != 0) {
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fprintf(stderr,
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"test_stripe: test_stripes returned %d\n", rv);
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"%s: check_stripes returned %d\n", prg, rv);
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exit(1);
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}
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free(disk_name);
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free(fds);
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free(offsets);
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free(buf);
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for(i=0; i<raid_disks; i++)
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close(fds[i]);
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exit(0);
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}
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