linux-kernel - Re: [PATCH] fs/ntfs3: Update inode->i_mapping->a

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Message-ID: <Z5h0Ic3igEvI11Cz@infradead.org>
Date: Mon, 27 Jan 2025 22:07:29 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Cc: ntfs3@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Jiaji Qin <jjtan24@...udan.edu.cn>,
	Kun Hu <huk23@...udan.edu.cn>
Subject: Re: [PATCH] fs/ntfs3: Update inode->i_mapping->a_ops on compression
 state change

On Thu, Jan 23, 2025 at 04:53:35PM +0300, Konstantin Komarov wrote:
> Update inode->i_mapping->a_ops when the compression state changes to
> ensure correct address space operations.
> Clear ATTR_FLAG_SPARSED/FILE_ATTRIBUTE_SPARSE_FILE when enabling
> compression to prevent flag conflicts.

How is this synchronized against using the address_space ops?
Most of them can be called without i_rwsem held.