linux-ext4 - Re: [bugzilla:219548] the kernel crashes when storing an EXT4 file system in a ZRAM device

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Message-ID: <Z1qSTM_Eibvw0bM5@infradead.org>
Date: Wed, 11 Dec 2024 23:35:40 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Theodore Ts'o <tytso@....edu>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>,
	Christoph Hellwig <hch@...radead.org>, Jens Axboe <axboe@...nel.dk>,
	caiqingfu <baicaiaichibaicai@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ext4@...r.kernel.org, linux-block@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [bugzilla:219548] the kernel crashes when storing an EXT4 file
 system in a ZRAM device

On Thu, Dec 12, 2024 at 12:37:39AM -0500, Theodore Ts'o wrote:
> More generally, any file system which uses the buffer cache, and
> doesn't use jbd2 to control when writeback happens, I think is going
> to be at risk with a block device which requires stable writes.  The
> only way to fix this, really, is to have the buffer cache code copy
> the data to a bounce buffer, and then issue the write from the bounce
> buffer.

Should there be a pr_warn_once when using a file systems using the legacy
buffer cache interfaces on a device that requires stable pages?