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md/raid1: tidy up new functions: process_checks and fix_sync_read_error.
These changes are mostly cosmetic: 1/ change mddev->raid_disks to conf->raid_disks because the later is technically safer, though in current practice it doesn't matter in this particular context. 2/ Rearrange two for / if loops to have an early 'continue' so the body of the 'if' doesn't need to be indented so much. Signed-off-by: NeilBrown <neilb@suse.de>
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NeilBrown
parent
a68e587035
commit
78d7f5f726
@ -1203,6 +1203,7 @@ static int fix_sync_read_error(r1bio_t *r1_bio)
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int d = r1_bio->read_disk;
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int success = 0;
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mdk_rdev_t *rdev;
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int start;
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if (s > (PAGE_SIZE>>9))
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s = PAGE_SIZE >> 9;
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@ -1227,41 +1228,7 @@ static int fix_sync_read_error(r1bio_t *r1_bio)
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d = 0;
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} while (!success && d != r1_bio->read_disk);
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if (success) {
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int start = d;
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/* write it back and re-read */
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set_bit(R1BIO_Uptodate, &r1_bio->state);
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while (d != r1_bio->read_disk) {
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if (d == 0)
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d = conf->raid_disks;
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d--;
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if (r1_bio->bios[d]->bi_end_io != end_sync_read)
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continue;
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rdev = conf->mirrors[d].rdev;
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atomic_add(s, &rdev->corrected_errors);
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if (sync_page_io(rdev,
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sect,
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s<<9,
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bio->bi_io_vec[idx].bv_page,
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WRITE, false) == 0)
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md_error(mddev, rdev);
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}
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d = start;
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while (d != r1_bio->read_disk) {
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if (d == 0)
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d = conf->raid_disks;
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d--;
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if (r1_bio->bios[d]->bi_end_io != end_sync_read)
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continue;
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rdev = conf->mirrors[d].rdev;
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if (sync_page_io(rdev,
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sect,
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s<<9,
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bio->bi_io_vec[idx].bv_page,
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READ, false) == 0)
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md_error(mddev, rdev);
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}
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} else {
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if (!success) {
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char b[BDEVNAME_SIZE];
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/* Cannot read from anywhere, array is toast */
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md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev);
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@ -1274,10 +1241,47 @@ static int fix_sync_read_error(r1bio_t *r1_bio)
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put_buf(r1_bio);
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return 0;
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}
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start = d;
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/* write it back and re-read */
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while (d != r1_bio->read_disk) {
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if (d == 0)
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d = conf->raid_disks;
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d--;
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if (r1_bio->bios[d]->bi_end_io != end_sync_read)
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continue;
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rdev = conf->mirrors[d].rdev;
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if (sync_page_io(rdev,
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sect,
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s<<9,
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bio->bi_io_vec[idx].bv_page,
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WRITE, false) == 0) {
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r1_bio->bios[d]->bi_end_io = NULL;
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rdev_dec_pending(rdev, mddev);
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md_error(mddev, rdev);
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} else
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atomic_add(s, &rdev->corrected_errors);
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}
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d = start;
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while (d != r1_bio->read_disk) {
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if (d == 0)
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d = conf->raid_disks;
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d--;
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if (r1_bio->bios[d]->bi_end_io != end_sync_read)
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continue;
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rdev = conf->mirrors[d].rdev;
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if (sync_page_io(rdev,
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sect,
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s<<9,
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bio->bi_io_vec[idx].bv_page,
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READ, false) == 0)
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md_error(mddev, rdev);
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}
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sectors -= s;
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sect += s;
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idx ++;
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}
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set_bit(R1BIO_Uptodate, &r1_bio->state);
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return 1;
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}
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@ -1296,7 +1300,7 @@ static int process_checks(r1bio_t *r1_bio)
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int i;
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if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) {
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for (i=0; i<mddev->raid_disks; i++)
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for (i=0; i < conf->raid_disks; i++)
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if (r1_bio->bios[i]->bi_end_io == end_sync_read)
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md_error(mddev, conf->mirrors[i].rdev);
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@ -1304,7 +1308,7 @@ static int process_checks(r1bio_t *r1_bio)
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put_buf(r1_bio);
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return -1;
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}
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for (primary=0; primary<mddev->raid_disks; primary++)
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for (primary = 0; primary < conf->raid_disks; primary++)
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if (r1_bio->bios[primary]->bi_end_io == end_sync_read &&
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test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) {
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r1_bio->bios[primary]->bi_end_io = NULL;
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@ -1312,61 +1316,63 @@ static int process_checks(r1bio_t *r1_bio)
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break;
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}
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r1_bio->read_disk = primary;
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for (i=0; i<mddev->raid_disks; i++)
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if (r1_bio->bios[i]->bi_end_io == end_sync_read) {
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int j;
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int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9);
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struct bio *pbio = r1_bio->bios[primary];
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struct bio *sbio = r1_bio->bios[i];
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for (i = 0; i < conf->raid_disks; i++) {
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int j;
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int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9);
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struct bio *pbio = r1_bio->bios[primary];
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struct bio *sbio = r1_bio->bios[i];
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int size;
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if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) {
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for (j = vcnt; j-- ; ) {
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struct page *p, *s;
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p = pbio->bi_io_vec[j].bv_page;
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s = sbio->bi_io_vec[j].bv_page;
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if (memcmp(page_address(p),
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page_address(s),
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PAGE_SIZE))
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break;
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}
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} else
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j = 0;
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if (j >= 0)
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mddev->resync_mismatches += r1_bio->sectors;
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if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)
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&& test_bit(BIO_UPTODATE, &sbio->bi_flags))) {
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sbio->bi_end_io = NULL;
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rdev_dec_pending(conf->mirrors[i].rdev, mddev);
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} else {
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/* fixup the bio for reuse */
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int size;
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sbio->bi_vcnt = vcnt;
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sbio->bi_size = r1_bio->sectors << 9;
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sbio->bi_idx = 0;
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sbio->bi_phys_segments = 0;
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sbio->bi_flags &= ~(BIO_POOL_MASK - 1);
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sbio->bi_flags |= 1 << BIO_UPTODATE;
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sbio->bi_next = NULL;
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sbio->bi_sector = r1_bio->sector +
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conf->mirrors[i].rdev->data_offset;
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sbio->bi_bdev = conf->mirrors[i].rdev->bdev;
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size = sbio->bi_size;
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for (j = 0; j < vcnt ; j++) {
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struct bio_vec *bi;
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bi = &sbio->bi_io_vec[j];
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bi->bv_offset = 0;
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if (size > PAGE_SIZE)
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bi->bv_len = PAGE_SIZE;
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else
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bi->bv_len = size;
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size -= PAGE_SIZE;
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memcpy(page_address(bi->bv_page),
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page_address(pbio->bi_io_vec[j].bv_page),
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PAGE_SIZE);
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}
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if (r1_bio->bios[i]->bi_end_io != end_sync_read)
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continue;
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if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) {
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for (j = vcnt; j-- ; ) {
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struct page *p, *s;
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p = pbio->bi_io_vec[j].bv_page;
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s = sbio->bi_io_vec[j].bv_page;
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if (memcmp(page_address(p),
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page_address(s),
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PAGE_SIZE))
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break;
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}
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} else
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j = 0;
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if (j >= 0)
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mddev->resync_mismatches += r1_bio->sectors;
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if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)
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&& test_bit(BIO_UPTODATE, &sbio->bi_flags))) {
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/* No need to write to this device. */
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sbio->bi_end_io = NULL;
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rdev_dec_pending(conf->mirrors[i].rdev, mddev);
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continue;
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}
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/* fixup the bio for reuse */
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sbio->bi_vcnt = vcnt;
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sbio->bi_size = r1_bio->sectors << 9;
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sbio->bi_idx = 0;
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sbio->bi_phys_segments = 0;
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sbio->bi_flags &= ~(BIO_POOL_MASK - 1);
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sbio->bi_flags |= 1 << BIO_UPTODATE;
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sbio->bi_next = NULL;
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sbio->bi_sector = r1_bio->sector +
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conf->mirrors[i].rdev->data_offset;
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sbio->bi_bdev = conf->mirrors[i].rdev->bdev;
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size = sbio->bi_size;
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for (j = 0; j < vcnt ; j++) {
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struct bio_vec *bi;
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bi = &sbio->bi_io_vec[j];
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bi->bv_offset = 0;
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if (size > PAGE_SIZE)
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bi->bv_len = PAGE_SIZE;
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else
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bi->bv_len = size;
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size -= PAGE_SIZE;
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memcpy(page_address(bi->bv_page),
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page_address(pbio->bi_io_vec[j].bv_page),
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PAGE_SIZE);
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}
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}
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return 0;
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}
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