linux-kernel - [PATCH v2 0/5] Validate logical block size in blk_validate

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Message-Id: <20240708091651.177447-1-john.g.garry@oracle.com>
Date: Mon,  8 Jul 2024 09:16:46 +0000
From: John Garry <john.g.garry@...cle.com>
To: axboe@...nel.dk, mst@...hat.com, jasowang@...hat.com,
        xuanzhuo@...ux.alibaba.com, eperezma@...hat.com, pbonzini@...hat.com,
        stefanha@...hat.com, hare@...e.de, kbusch@...nel.org, hch@....de
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux.dev, John Garry <john.g.garry@...cle.com>
Subject: [PATCH v2 0/5] Validate logical block size in blk_validate_limits()

This series adds validation of the logical block size in
blk_validate_limits().

Some drivers had already been validating this themselves. As such, we can
mostly drop that driver validation.

nbd is problematic, as we cannot only change to just stop calling
blk_validate_limits(). This is because the LBS is updated in a 2-stage
process:
a. update block size in the driver and validate
b. update queue limits

So if we stop validating the limits in a., there is a user-visible change
in behaviour (as we stop rejecting invalid limits from the NBD_SET_BLKSIZE
ioctl). So I left that untouched.

This topic was originally mentioned in [0] and then again in [1] by
Keith.

I have also included a related virtio_blk change to deal with
blk_size config fallback.

[0] https://lore.kernel.org/linux-block/10b3e3fe-6ad5-4e0e-b822-f51656c976ee@oracle.com/
[1] https://lore.kernel.org/linux-block/Zl4dxaQgPbw19Irk@kbusch-mbp.dhcp.thefacebook.com/

Differences to v1:
- Add RB tags (thanks!)
- Update comment on blk_validate_block_size() and add print in
  blk_validate_limits()

John Garry (5):
  virtio_blk: Fix default logical block size fallback
  block: Validate logical block size in blk_validate_limits()
  null_blk: Don't bother validating blocksize
  virtio_blk: Don't bother validating blocksize
  loop: Don't bother validating blocksize

 block/blk-settings.c          |  4 ++++
 drivers/block/loop.c          | 12 +-----------
 drivers/block/null_blk/main.c |  3 ---
 drivers/block/virtio_blk.c    | 31 +++++++++++--------------------
 include/linux/blkdev.h        |  1 +
 5 files changed, 17 insertions(+), 34 deletions(-)

-- 
2.31.1