forked from luck/tmp_suning_uos_patched
md/raid10: Refactor raid10_make_request
Refactor raid10_make_request into seperate read and write functions to clean up the code. Shaohua: add the recovery check back to read path Signed-off-by: Robert LeBlanc <robert@leblancnet.us> Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Robert LeBlanc
Shaohua Li
parent
3b046a97cb
commit
bb5f1ed70b
@ -1087,23 +1087,122 @@ static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule)
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kfree(plug);
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}
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static void __make_request(struct mddev *mddev, struct bio *bio)
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static void raid10_read_request(struct mddev *mddev, struct bio *bio,
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struct r10bio *r10_bio)
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{
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struct r10conf *conf = mddev->private;
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struct r10bio *r10_bio;
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struct bio *read_bio;
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const int op = bio_op(bio);
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const unsigned long do_sync = (bio->bi_opf & REQ_SYNC);
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int sectors_handled;
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int max_sectors;
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sector_t sectors;
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struct md_rdev *rdev;
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int slot;
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/*
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* Register the new request and wait if the reconstruction
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* thread has put up a bar for new requests.
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* Continue immediately if no resync is active currently.
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*/
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wait_barrier(conf);
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sectors = bio_sectors(bio);
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while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
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bio->bi_iter.bi_sector < conf->reshape_progress &&
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bio->bi_iter.bi_sector + sectors > conf->reshape_progress) {
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/*
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* IO spans the reshape position. Need to wait for reshape to
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* pass
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*/
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raid10_log(conf->mddev, "wait reshape");
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allow_barrier(conf);
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wait_event(conf->wait_barrier,
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conf->reshape_progress <= bio->bi_iter.bi_sector ||
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conf->reshape_progress >= bio->bi_iter.bi_sector +
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sectors);
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wait_barrier(conf);
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}
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read_again:
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rdev = read_balance(conf, r10_bio, &max_sectors);
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if (!rdev) {
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raid_end_bio_io(r10_bio);
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return;
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}
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slot = r10_bio->read_slot;
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read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
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bio_trim(read_bio, r10_bio->sector - bio->bi_iter.bi_sector,
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max_sectors);
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r10_bio->devs[slot].bio = read_bio;
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r10_bio->devs[slot].rdev = rdev;
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read_bio->bi_iter.bi_sector = r10_bio->devs[slot].addr +
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choose_data_offset(r10_bio, rdev);
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read_bio->bi_bdev = rdev->bdev;
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read_bio->bi_end_io = raid10_end_read_request;
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bio_set_op_attrs(read_bio, op, do_sync);
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if (test_bit(FailFast, &rdev->flags) &&
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test_bit(R10BIO_FailFast, &r10_bio->state))
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read_bio->bi_opf |= MD_FAILFAST;
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read_bio->bi_private = r10_bio;
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if (mddev->gendisk)
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trace_block_bio_remap(bdev_get_queue(read_bio->bi_bdev),
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read_bio, disk_devt(mddev->gendisk),
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r10_bio->sector);
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if (max_sectors < r10_bio->sectors) {
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/*
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* Could not read all from this device, so we will need another
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* r10_bio.
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*/
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sectors_handled = (r10_bio->sector + max_sectors
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- bio->bi_iter.bi_sector);
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r10_bio->sectors = max_sectors;
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spin_lock_irq(&conf->device_lock);
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if (bio->bi_phys_segments == 0)
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bio->bi_phys_segments = 2;
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else
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bio->bi_phys_segments++;
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spin_unlock_irq(&conf->device_lock);
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/*
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* Cannot call generic_make_request directly as that will be
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* queued in __generic_make_request and subsequent
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* mempool_alloc might block waiting for it. so hand bio over
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* to raid10d.
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*/
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reschedule_retry(r10_bio);
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r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
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r10_bio->master_bio = bio;
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r10_bio->sectors = bio_sectors(bio) - sectors_handled;
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r10_bio->state = 0;
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r10_bio->mddev = mddev;
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r10_bio->sector = bio->bi_iter.bi_sector + sectors_handled;
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goto read_again;
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} else
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generic_make_request(read_bio);
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return;
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}
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static void raid10_write_request(struct mddev *mddev, struct bio *bio,
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struct r10bio *r10_bio)
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{
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struct r10conf *conf = mddev->private;
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int i;
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const int op = bio_op(bio);
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const int rw = bio_data_dir(bio);
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const unsigned long do_sync = (bio->bi_opf & REQ_SYNC);
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const unsigned long do_fua = (bio->bi_opf & REQ_FUA);
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unsigned long flags;
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struct md_rdev *blocked_rdev;
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struct blk_plug_cb *cb;
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struct raid10_plug_cb *plug = NULL;
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sector_t sectors;
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int sectors_handled;
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int max_sectors;
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int sectors;
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md_write_start(mddev, bio);
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@ -1118,8 +1217,9 @@ static void __make_request(struct mddev *mddev, struct bio *bio)
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while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
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bio->bi_iter.bi_sector < conf->reshape_progress &&
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bio->bi_iter.bi_sector + sectors > conf->reshape_progress) {
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/* IO spans the reshape position. Need to wait for
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* reshape to pass
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/*
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* IO spans the reshape position. Need to wait for reshape to
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* pass
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*/
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raid10_log(conf->mddev, "wait reshape");
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allow_barrier(conf);
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@ -1129,8 +1229,8 @@ static void __make_request(struct mddev *mddev, struct bio *bio)
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sectors);
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wait_barrier(conf);
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}
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if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
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bio_data_dir(bio) == WRITE &&
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(mddev->reshape_backwards
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? (bio->bi_iter.bi_sector < conf->reshape_safe &&
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bio->bi_iter.bi_sector + sectors > conf->reshape_progress)
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@ -1148,98 +1248,6 @@ static void __make_request(struct mddev *mddev, struct bio *bio)
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conf->reshape_safe = mddev->reshape_position;
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}
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r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
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r10_bio->master_bio = bio;
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r10_bio->sectors = sectors;
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r10_bio->mddev = mddev;
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r10_bio->sector = bio->bi_iter.bi_sector;
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r10_bio->state = 0;
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/* We might need to issue multiple reads to different
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* devices if there are bad blocks around, so we keep
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* track of the number of reads in bio->bi_phys_segments.
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* If this is 0, there is only one r10_bio and no locking
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* will be needed when the request completes. If it is
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* non-zero, then it is the number of not-completed requests.
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*/
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bio->bi_phys_segments = 0;
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bio_clear_flag(bio, BIO_SEG_VALID);
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if (rw == READ) {
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/*
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* read balancing logic:
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*/
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struct md_rdev *rdev;
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int slot;
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read_again:
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rdev = read_balance(conf, r10_bio, &max_sectors);
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if (!rdev) {
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raid_end_bio_io(r10_bio);
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return;
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}
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slot = r10_bio->read_slot;
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read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
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bio_trim(read_bio, r10_bio->sector - bio->bi_iter.bi_sector,
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max_sectors);
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r10_bio->devs[slot].bio = read_bio;
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r10_bio->devs[slot].rdev = rdev;
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read_bio->bi_iter.bi_sector = r10_bio->devs[slot].addr +
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choose_data_offset(r10_bio, rdev);
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read_bio->bi_bdev = rdev->bdev;
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read_bio->bi_end_io = raid10_end_read_request;
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bio_set_op_attrs(read_bio, op, do_sync);
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if (test_bit(FailFast, &rdev->flags) &&
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test_bit(R10BIO_FailFast, &r10_bio->state))
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read_bio->bi_opf |= MD_FAILFAST;
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read_bio->bi_private = r10_bio;
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if (mddev->gendisk)
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trace_block_bio_remap(bdev_get_queue(read_bio->bi_bdev),
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read_bio, disk_devt(mddev->gendisk),
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r10_bio->sector);
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if (max_sectors < r10_bio->sectors) {
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/* Could not read all from this device, so we will
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* need another r10_bio.
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*/
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sectors_handled = (r10_bio->sector + max_sectors
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- bio->bi_iter.bi_sector);
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r10_bio->sectors = max_sectors;
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spin_lock_irq(&conf->device_lock);
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if (bio->bi_phys_segments == 0)
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bio->bi_phys_segments = 2;
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else
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bio->bi_phys_segments++;
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spin_unlock_irq(&conf->device_lock);
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/* Cannot call generic_make_request directly
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* as that will be queued in __generic_make_request
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* and subsequent mempool_alloc might block
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* waiting for it. so hand bio over to raid10d.
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*/
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reschedule_retry(r10_bio);
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r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
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r10_bio->master_bio = bio;
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r10_bio->sectors = bio_sectors(bio) - sectors_handled;
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r10_bio->state = 0;
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r10_bio->mddev = mddev;
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r10_bio->sector = bio->bi_iter.bi_sector +
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sectors_handled;
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goto read_again;
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} else
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generic_make_request(read_bio);
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return;
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}
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/*
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* WRITE:
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*/
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if (conf->pending_count >= max_queued_requests) {
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md_wakeup_thread(mddev->thread);
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raid10_log(mddev, "wait queued");
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@ -1300,8 +1308,7 @@ static void __make_request(struct mddev *mddev, struct bio *bio)
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int bad_sectors;
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int is_bad;
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is_bad = is_badblock(rdev, dev_sector,
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max_sectors,
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is_bad = is_badblock(rdev, dev_sector, max_sectors,
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&first_bad, &bad_sectors);
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if (is_bad < 0) {
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/* Mustn't write here until the bad block
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@ -1405,8 +1412,7 @@ static void __make_request(struct mddev *mddev, struct bio *bio)
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r10_bio->devs[i].bio = mbio;
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mbio->bi_iter.bi_sector = (r10_bio->devs[i].addr+
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choose_data_offset(r10_bio,
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rdev));
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choose_data_offset(r10_bio, rdev));
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mbio->bi_bdev = rdev->bdev;
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mbio->bi_end_io = raid10_end_write_request;
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bio_set_op_attrs(mbio, op, do_sync | do_fua);
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@ -1457,8 +1463,7 @@ static void __make_request(struct mddev *mddev, struct bio *bio)
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r10_bio->devs[i].repl_bio = mbio;
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mbio->bi_iter.bi_sector = (r10_bio->devs[i].addr +
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choose_data_offset(
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r10_bio, rdev));
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choose_data_offset(r10_bio, rdev));
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mbio->bi_bdev = rdev->bdev;
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mbio->bi_end_io = raid10_end_write_request;
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bio_set_op_attrs(mbio, op, do_sync | do_fua);
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@ -1503,6 +1508,36 @@ static void __make_request(struct mddev *mddev, struct bio *bio)
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one_write_done(r10_bio);
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}
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static void __make_request(struct mddev *mddev, struct bio *bio)
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{
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struct r10conf *conf = mddev->private;
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struct r10bio *r10_bio;
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r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
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r10_bio->master_bio = bio;
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r10_bio->sectors = bio_sectors(bio);
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r10_bio->mddev = mddev;
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r10_bio->sector = bio->bi_iter.bi_sector;
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r10_bio->state = 0;
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/*
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* We might need to issue multiple reads to different devices if there
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* are bad blocks around, so we keep track of the number of reads in
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* bio->bi_phys_segments. If this is 0, there is only one r10_bio and
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* no locking will be needed when the request completes. If it is
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* non-zero, then it is the number of not-completed requests.
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*/
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bio->bi_phys_segments = 0;
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bio_clear_flag(bio, BIO_SEG_VALID);
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if (bio_data_dir(bio) == READ)
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raid10_read_request(mddev, bio, r10_bio);
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else
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raid10_write_request(mddev, bio, r10_bio);
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}
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static void raid10_make_request(struct mddev *mddev, struct bio *bio)
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{
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struct r10conf *conf = mddev->private;
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