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Date:   Tue, 13 Apr 2021 14:05:12 +0100
From:   Christoph Hellwig <hch@infradead.org>
To:     Jan Kara <jack@suse.cz>
Cc:     linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
        linux-xfs@vger.kernel.org, Ted Tso <tytso@mit.edu>,
        Christoph Hellwig <hch@infradead.org>,
        Amir Goldstein <amir73il@gmail.com>,
        Dave Chinner <david@fromorbit.com>
Subject: Re: [PATCH 5/7] xfs: Convert to use i_mapping_sem
Message-ID: <20210413130512.GC1366579@infradead.org>
References: <20210413105205.3093-1-jack@suse.cz>
 <20210413112859.32249-5-jack@suse.cz>
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On Tue, Apr 13, 2021 at 01:28:49PM +0200, Jan Kara wrote:
> Use i_mapping_sem instead of XFS internal i_mmap_lock. The intended
> purpose of i_mapping_sem is exactly the same.

Might be worth mentioning here that the locking in __xfs_filemap_fault
changes because filemap_fault already takes i_mapping_sem?

>   * mmap_lock (MM)
>   *   sb_start_pagefault(vfs, freeze)
> - *     i_mmaplock (XFS - truncate serialisation)
> + *     i_mapping_sem (XFS - truncate serialisation)

This is sort of VFS now, isn't it?

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>