From: Gulam Mohamed <gulam.mohamed@oracle.com>
To: Ming Lei <ming.lei@redhat.com>, Christoph Hellwig <hch@lst.de>
Cc: "axboe@kernel.dk" <axboe@kernel.dk>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>
Subject: RE: [PATCH 1/2] block: prevent block device lookups at the beginning of del_gendisk
Date: Thu, 20 May 2021 17:37:18 +0000 [thread overview]
Message-ID: <CO1PR10MB4563BDF0F824F9E16EFBA102982A9@CO1PR10MB4563.namprd10.prod.outlook.com> (raw)
In-Reply-To: <YJ9rkRGG5SUyjgsg@T590>
-----Original Message-----
From: Ming Lei <ming.lei@redhat.com>
Sent: Saturday, May 15, 2021 12:05 PM
To: Christoph Hellwig <hch@lst.de>
Cc: axboe@kernel.dk; Gulam Mohamed <gulam.mohamed@oracle.com>; linux-block@vger.kernel.org
Subject: Re: [PATCH 1/2] block: prevent block device lookups at the beginning of del_gendisk
On Fri, May 14, 2021 at 03:18:41PM +0200, Christoph Hellwig wrote:
> As an artifact of how gendisk lookup used to work in earlier kernels,
> GENHD_FL_UP is only cleared very late in del_gendisk, and a global
> lock is used to prevent opens from succeeding while del_gendisk is
> tearing down the gendisk. Switch to clearing the flag early and under
> bd_mutex so that callers can use bd_mutex to stabilize the flag, which
> removes the need for the global mutex.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
I have tested these patches on latest kernel in our environment and didn't find any issue. The fix is working fine.
Tested-by: Gulam Mohamed <gulam.mohamed@oracle.com>
--
Ming
next prev parent reply other threads:[~2021-05-20 17:37 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-14 13:18 fix a race between del_gendisk and BLKRRPART v2 Christoph Hellwig
2021-05-14 13:18 ` [PATCH 1/2] block: prevent block device lookups at the beginning of del_gendisk Christoph Hellwig
2021-05-15 6:34 ` Ming Lei
2021-05-20 17:37 ` Gulam Mohamed [this message]
2021-05-14 13:18 ` [PATCH 2/2] block: fix a race between del_gendisk and BLKRRPART Christoph Hellwig
2021-05-15 6:35 ` Ming Lei
2021-05-20 17:37 ` Gulam Mohamed
2021-05-20 8:14 ` fix a race between del_gendisk and BLKRRPART v2 Christoph Hellwig
2021-05-20 13:59 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2021-05-12 16:50 fix a race between del_gendisk and BLKRRPART Christoph Hellwig
2021-05-12 16:50 ` [PATCH 1/2] block: prevent block device lookups at the beginning of del_gendisk Christoph Hellwig
2021-05-13 0:11 ` Ming Lei
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CO1PR10MB4563BDF0F824F9E16EFBA102982A9@CO1PR10MB4563.namprd10.prod.outlook.com \
--to=gulam.mohamed@oracle.com \
--cc=axboe@kernel.dk \
--cc=hch@lst.de \
--cc=linux-block@vger.kernel.org \
--cc=ming.lei@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.