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md: simplify md_open

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Now that devices are on the all_mddevs list until the gendisk is freed,
there can't be any duplicates.  Remove the global list lookup and just
grab a reference.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2022-07-19 11:18:24 +02:00
committed by Jens Axboe
parent 12a6caf273
commit 5b26804bb0
1 changed files with 15 additions and 27 deletions
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42
drivers/md/md.c
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@@ -7783,45 +7783,33 @@ static int md_set_read_only(struct block_device *bdev, bool ro)
static int md_open(struct block_device *bdev, fmode_t mode)
{
/*
* Succeed if we can lock the mddev, which confirms that
* it isn't being stopped right now.
*/
struct mddev *mddev = mddev_find(bdev->bd_dev);
struct mddev *mddev;
int err;
spin_lock(&all_mddevs_lock);
mddev = mddev_get(bdev->bd_disk->private_data);
spin_unlock(&all_mddevs_lock);
if (!mddev)
return -ENODEV;
if (mddev->gendisk != bdev->bd_disk) {
/* we are racing with mddev_put which is discarding this
* bd_disk.
*/
mddev_put(mddev);
/* Wait until bdev->bd_disk is definitely gone */
if (work_pending(&mddev->del_work))
flush_workqueue(md_misc_wq);
return -EBUSY;
}
BUG_ON(mddev != bdev->bd_disk->private_data);
if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
err = mutex_lock_interruptible(&mddev->open_mutex);
if (err)
goto out;
if (test_bit(MD_CLOSING, &mddev->flags)) {
mutex_unlock(&mddev->open_mutex);
err = -ENODEV;
goto out;
}
err = -ENODEV;
if (test_bit(MD_CLOSING, &mddev->flags))
goto out_unlock;
err = 0;
atomic_inc(&mddev->openers);
mutex_unlock(&mddev->open_mutex);
bdev_check_media_change(bdev);
out:
if (err)
mddev_put(mddev);
return 0;
out_unlock:
mutex_unlock(&mddev->open_mutex);
out:
mddev_put(mddev);
return err;
}