linux-ext4 - Re: [PATCH 5/7] xfs: Convert to use i_mapping

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Date:   Tue, 13 Apr 2021 15:42:27 +0200
From:   Jan Kara <jack@...e.cz>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        Ted Tso <tytso@....edu>, Amir Goldstein <amir73il@...il.com>,
        Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH 5/7] xfs: Convert to use i_mapping_sem

On Tue 13-04-21 14:05:12, Christoph Hellwig wrote:
> 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?

Sure, will add.

> 
> >   * 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?

Right, I'll update the comment.

> Otherwise looks good:
> 
> Reviewed-by: Christoph Hellwig <hch@....de>

Thanks!

								Honza

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR