linux-kernel - Re: [PATCH v2] loop: use vfs_getattr

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Message-ID: <20250812042826.GU222315@ZenIV>
Date: Tue, 12 Aug 2025 05:28:26 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: Damien Le Moal <dlemoal@...nel.org>
Cc: Rajeev Mishra <rajeevm@....com>, axboe@...nel.dk,
	yukuai1@...weicloud.com, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] loop: use vfs_getattr_nosec() for accurate file size

On Tue, Aug 12, 2025 at 12:42:44PM +0900, Damien Le Moal wrote:

> Since loff_t is "long long", so a signed type, I would keep this interface and
> add a negative error check in the 2 call sites for get_size(). That is simpler.

Umm...  First of all, what's the point of separate get_size() and loop_get_size()?
Another thing to watch out for - replacing file needs to be careful, lest you
replace the old file that has come to fail vfs_getattr() with new one that
does the same thing ;-)