md/raid1: split out two sub-functions from sync_request_write
sync_request_write is too big and too deep. So split out two self-contains bits of functionality into separate function. Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown
parent
6f8d0c77ce
commit
a68e587035
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@ -1181,6 +1181,195 @@ static void end_sync_write(struct bio *bio, int error)
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}
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}
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static int fix_sync_read_error(r1bio_t *r1_bio)
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{
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/* Try some synchronous reads of other devices to get
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* good data, much like with normal read errors. Only
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* read into the pages we already have so we don't
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* need to re-issue the read request.
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* We don't need to freeze the array, because being in an
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* active sync request, there is no normal IO, and
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* no overlapping syncs.
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*/
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mddev_t *mddev = r1_bio->mddev;
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conf_t *conf = mddev->private;
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struct bio *bio = r1_bio->bios[r1_bio->read_disk];
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sector_t sect = r1_bio->sector;
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int sectors = r1_bio->sectors;
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int idx = 0;
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while(sectors) {
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int s = sectors;
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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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if (s > (PAGE_SIZE>>9))
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s = PAGE_SIZE >> 9;
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do {
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if (r1_bio->bios[d]->bi_end_io == end_sync_read) {
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/* No rcu protection needed here devices
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* can only be removed when no resync is
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* active, and resync is currently active
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*/
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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)) {
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success = 1;
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break;
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}
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}
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d++;
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if (d == conf->raid_disks)
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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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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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printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error"
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" for block %llu\n",
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mdname(mddev),
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bdevname(bio->bi_bdev, b),
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(unsigned long long)r1_bio->sector);
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md_done_sync(mddev, r1_bio->sectors, 0);
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put_buf(r1_bio);
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return 0;
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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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return 1;
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}
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static int process_checks(r1bio_t *r1_bio)
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{
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/* We have read all readable devices. If we haven't
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* got the block, then there is no hope left.
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* If we have, then we want to do a comparison
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* and skip the write if everything is the same.
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* If any blocks failed to read, then we need to
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* attempt an over-write
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*/
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mddev_t *mddev = r1_bio->mddev;
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conf_t *conf = mddev->private;
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int primary;
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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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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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md_done_sync(mddev, r1_bio->sectors, 1);
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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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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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rdev_dec_pending(conf->mirrors[primary].rdev, mddev);
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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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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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}
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}
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return 0;
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}
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static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio)
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{
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conf_t *conf = mddev->private;
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@ -1191,184 +1380,14 @@ static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio)
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bio = r1_bio->bios[r1_bio->read_disk];
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if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
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/* We have read all readable devices. If we haven't
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* got the block, then there is no hope left.
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* If we have, then we want to do a comparison
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* and skip the write if everything is the same.
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* If any blocks failed to read, then we need to
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* attempt an over-write
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*/
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int primary;
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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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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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md_done_sync(mddev, r1_bio->sectors, 1);
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put_buf(r1_bio);
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if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
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if (process_checks(r1_bio) < 0)
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return;
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}
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for (primary=0; primary<mddev->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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rdev_dec_pending(conf->mirrors[primary].rdev, mddev);
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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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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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}
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}
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}
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if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) {
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/* ouch - failed to read all of that.
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* Try some synchronous reads of other devices to get
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* good data, much like with normal read errors. Only
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* read into the pages we already have so we don't
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* need to re-issue the read request.
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* We don't need to freeze the array, because being in an
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* active sync request, there is no normal IO, and
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* no overlapping syncs.
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*/
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sector_t sect = r1_bio->sector;
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int sectors = r1_bio->sectors;
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int idx = 0;
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while(sectors) {
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int s = sectors;
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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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if (s > (PAGE_SIZE>>9))
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s = PAGE_SIZE >> 9;
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do {
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if (r1_bio->bios[d]->bi_end_io == end_sync_read) {
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/* No rcu protection needed here devices
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* can only be removed when no resync is
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* active, and resync is currently active
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*/
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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)) {
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success = 1;
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break;
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}
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}
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d++;
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if (d == conf->raid_disks)
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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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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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printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error"
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" for block %llu\n",
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mdname(mddev),
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bdevname(bio->bi_bdev, b),
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(unsigned long long)r1_bio->sector);
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md_done_sync(mddev, r1_bio->sectors, 0);
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put_buf(r1_bio);
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return;
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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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}
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if (!test_bit(R1BIO_Uptodate, &r1_bio->state))
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/* ouch - failed to read all of that. */
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if (!fix_sync_read_error(r1_bio))
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return;
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/*
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* schedule writes
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*/
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