Re: [PATCH v2 1/2] block: fail op_is_write() requests to read-only partitions

[PATCH v2 0/2] block: enforce ioctl(BLKROSET) and set_disk_ro() · Ilya Dryomov <idryomov@gmail.com> · 2018-01-10
[PATCH v2 1/2] block: fail op_is_write() requests to read-only partitions · Ilya Dryomov <idryomov@gmail.com> · 2018-01-10
Re: [PATCH v2 1/2] block: fail op_is_write() requests to read-only partitions · Jens Axboe <axboe@kernel.dk> · 2018-01-10
Re: [PATCH v2 1/2] block: fail op_is_write() requests to read-only partitions · Ilya Dryomov <idryomov@gmail.com> · 2018-01-10
Re: [PATCH v2 1/2] block: fail op_is_write() requests to read-only partitions · Christoph Hellwig <hch@infradead.org> · 2018-01-10
[PATCH v2 2/2] block: add bdev_read_only() checks to common helpers · Ilya Dryomov <idryomov@gmail.com> · 2018-01-10

From: Christoph Hellwig <hch@infradead.org>
Date: 2018-01-10 16:55:28

On Wed, Jan 10, 2018 at 09:34:02AM -0700, Jens Axboe wrote:

It's yet another check that adds part lookup and rcu lock/unlock in that
path. Can we combine some of them? Make this part of the remap?  This
overhead impacts every IO, let's not bloat it more than absolutely
necessary.

Yes, we should be able to integrate this with the partition remap.

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