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Message-ID: <Z2BD_JLfuZ9VVwhQ@casper.infradead.org>
Date: Mon, 16 Dec 2024 15:15:08 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, tytso@....edu,
adilger.kernel@...ger.ca, jack@...e.cz, yi.zhang@...wei.com,
chengzhihao1@...wei.com, yukuai3@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH v4 01/10] ext4: remove writable userspace mappings before
truncating page cache
On Mon, Dec 16, 2024 at 09:39:06AM +0800, Zhang Yi wrote:
> $mkfs.ext4 -b 1024 /dev/vdb
> $mount /dev/vdb /mnt
> $xfs_io -t -f -c "pwrite -S 0x58 0 4096" -c "mmap -rw 0 4096" \
> -c "mwrite -S 0x5a 2048 2048" -c "fzero 2048 2048" \
> -c "mwrite -S 0x59 2048 2048" -c "close" /mnt/foo
>
> $od -Ax -t x1z /mnt/foo
> 000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58
> *
> 000800 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59
> *
> 001000
>
> $umount /mnt && mount /dev/vdb /mnt
> $od -Ax -t x1z /mnt/foo
> 000000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58
> *
> 000800 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> *
> 001000
Can you add this to fstests please so we can be sure other filesystems
don't have the same problem?
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