raid6check.c: lock the stripe until necessary
The stripe locking mechanism must be atomic between the check and the, potential, autorepair. For this reason, the autorepair code needs to be just after the check and both parts (check and autorepair) must be excuted under stripe lock. Of course, the manual repair can operate as before. This patch reorganize the code and provides the single, atomic, stripe lock. It should be confirmed that this new locking is not too demanding. In case it is, some other solutions will be required (suggestions wellcome). Signed off: piergiorgio.sartor@nexgo.de Signed-off-by: NeilBrown <neilb@suse.de>
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303a263544
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116
raid6check.c
116
raid6check.c
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@ -211,9 +211,6 @@ int check_stripes(struct mdinfo *info, int *source, unsigned long long *offsets,
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goto exitCheck;
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}
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}
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err = unlock_all_stripes(info, sig);
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if(err != 0)
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goto exitCheck;
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for (i = 0 ; i < data_disks ; i++) {
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int disk = geo_map(i, start, raid_disks, level, layout);
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@ -245,6 +242,64 @@ int check_stripes(struct mdinfo *info, int *source, unsigned long long *offsets,
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}
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}
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if(repair == AUTO_REPAIR) {
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int pages_to_write_count = 0;
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int page_to_write[chunk_size >> CHECK_PAGE_BITS];
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for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
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if (disk[j] >= 0) {
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printf("Auto-repairing slot %d (%s)\n", disk[j], name[disk[j]]);
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pages_to_write_count++;
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page_to_write[j] = 1;
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for(i = 0; i < raid_disks; i++) {
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blocks_page[i] = blocks[i] + j * CHECK_PAGE_SIZE;
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}
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if (disk[j] == diskQ) {
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qsyndrome(p, (uint8_t*)stripes[diskQ] + j * CHECK_PAGE_SIZE, (uint8_t**)blocks_page, data_disks, CHECK_PAGE_SIZE);
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}
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else {
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char *all_but_failed_blocks[data_disks];
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int failed_block_index = block_index_for_slot[disk[j]];
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for (i = 0; i < data_disks; i++) {
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if (failed_block_index == i) {
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all_but_failed_blocks[i] = stripes[diskP] + j * CHECK_PAGE_SIZE;
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}
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else {
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all_but_failed_blocks[i] = blocks_page[i];
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}
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}
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xor_blocks(stripes[disk[j]] + j * CHECK_PAGE_SIZE,
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all_but_failed_blocks, data_disks, CHECK_PAGE_SIZE);
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}
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}
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else {
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page_to_write[j] = 0;
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}
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}
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if(pages_to_write_count > 0) {
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int write_res = 0;
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for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
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if(page_to_write[j] == 1) {
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lseek64(source[disk[j]], offsets[disk[j]] + start * chunk_size + j * CHECK_PAGE_SIZE, SEEK_SET);
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write_res += write(source[disk[j]], stripes[disk[j]] + j * CHECK_PAGE_SIZE, CHECK_PAGE_SIZE);
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}
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}
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if (write_res != (CHECK_PAGE_SIZE * pages_to_write_count)) {
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fprintf(stderr, "Failed to write a full chunk.\n");
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unlock_all_stripes(info, sig);
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err = -1;
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goto exitCheck;
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}
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}
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}
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err = unlock_all_stripes(info, sig);
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if(err != 0) {
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goto exitCheck;
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}
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if(repair == MANUAL_REPAIR) {
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printf("Repairing stripe %llu\n", start);
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printf("Assuming slots %d (%s) and %d (%s) are incorrect\n",
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@ -335,61 +390,6 @@ int check_stripes(struct mdinfo *info, int *source, unsigned long long *offsets,
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}
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int pages_to_write_count = 0;
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int page_to_write[chunk_size >> CHECK_PAGE_BITS];
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for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
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if (disk[j] >= 0 && repair == AUTO_REPAIR) {
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printf("Auto-repairing slot %d (%s)\n", disk[j], name[disk[j]]);
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pages_to_write_count++;
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page_to_write[j] = 1;
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for(i = 0; i < raid_disks; i++) {
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blocks_page[i] = blocks[i] + j * CHECK_PAGE_SIZE;
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}
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if (disk[j] == diskQ) {
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qsyndrome(p, (uint8_t*)stripes[diskQ] + j * CHECK_PAGE_SIZE, (uint8_t**)blocks_page, data_disks, CHECK_PAGE_SIZE);
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} else {
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char *all_but_failed_blocks[data_disks];
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int failed_block_index = block_index_for_slot[disk[j]];
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for (i=0; i < data_disks; i++)
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if (failed_block_index == i)
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all_but_failed_blocks[i] = stripes[diskP] + j * CHECK_PAGE_SIZE;
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else
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all_but_failed_blocks[i] = blocks_page[i];
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xor_blocks(stripes[disk[j]] + j * CHECK_PAGE_SIZE,
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all_but_failed_blocks, data_disks, CHECK_PAGE_SIZE);
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}
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} else {
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page_to_write[j] = 0;
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}
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}
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if(pages_to_write_count > 0) {
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err = lock_stripe(info, start, chunk_size, data_disks, sig);
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if(err != 0) {
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if (err != 2)
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unlock_all_stripes(info, sig);
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goto exitCheck;
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}
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int write_res = 0;
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for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
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if(page_to_write[j] == 1) {
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lseek64(source[disk[j]], offsets[disk[j]] + start * chunk_size + j * CHECK_PAGE_SIZE, 0);
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write_res += write(source[disk[j]], stripes[disk[j]] + j * CHECK_PAGE_SIZE, CHECK_PAGE_SIZE);
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}
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}
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err = unlock_all_stripes(info, sig);
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if (err != 0 || write_res != (CHECK_PAGE_SIZE * pages_to_write_count))
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goto exitCheck;
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if (write_res != (CHECK_PAGE_SIZE * pages_to_write_count)) {
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fprintf(stderr, "Failed to write a full chunk.\n");
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goto exitCheck;
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}
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}
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length--;
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start++;
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}
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