From: Matthew Wilcox <willy@infradead.org>
To: Jan Kara <jack@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>, Ilya Dryomov <idryomov@gmail.com>,
Johannes Thumshirn <johannes.thumshirn@wdc.com>,
Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: always respect QUEUE_FLAG_STABLE_WRITES on the block device
Date: Thu, 4 May 2023 17:16:48 +0100 [thread overview]
Message-ID: <ZFPacOW6XMq+o4YU@casper.infradead.org> (raw)
In-Reply-To: <20230504155556.t6byee6shgb27pw5@quack3>
On Thu, May 04, 2023 at 05:55:56PM +0200, Jan Kara wrote:
> For bdev address_space that's easy but what Ilya also mentioned is a
> problem when 'stable_write' flag gets toggled on the device and in that
> case having to propagate the flag update to all the address_space
> structures is a nightmare...
We have a number of flags which don't take effect when modified on a
block device with a mounted filesystem on it. For example, modifying
the readahead settings do not change existing files, only new ones.
Since this flag is only modifiable for debugging purposes, I think I'm
OK with it not affecting already-mounted filesystems. It feels like a
decision that reasonable people could disagree on, though.
next prev parent reply other threads:[~2023-05-04 16:16 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-04 10:56 Ilya Dryomov
2023-05-04 13:55 ` Christoph Hellwig
2023-05-04 14:16 ` Matthew Wilcox
2023-05-04 15:07 ` Ilya Dryomov
2023-05-04 15:37 ` Matthew Wilcox
2023-05-04 15:55 ` Jan Kara
2023-05-04 16:16 ` Matthew Wilcox [this message]
2023-05-04 23:07 ` Dave Chinner
2023-05-05 10:49 ` Jan Kara
2023-05-04 15:03 ` Ilya Dryomov
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