linux-ext4 - Re: [PATCH v2 00/12] lazytime fix and cleanups

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Date:   Mon, 11 Jan 2021 12:44:35 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        Theodore Ts'o <tytso@....edu>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 00/12] lazytime fix and cleanups

On Mon, Jan 11, 2021 at 04:15:17PM +0100, Jan Kara wrote:
> Hi!
> 
> On Fri 08-01-21 23:58:51, Eric Biggers wrote:
> > Hello,
> > 
> > Patch 1 fixes a bug in how __writeback_single_inode() handles lazytime
> > expirations.  I originally reported this last year
> > (https://lore.kernel.org/r/20200306004555.GB225345@gmail.com) because it
> > causes the FS_IOC_REMOVE_ENCRYPTION_KEY ioctl to not work properly, as
> > the bug causes inodes to remain dirty after a sync.
> > 
> > It also turns out that lazytime on XFS is partially broken because it
> > doesn't actually write timestamps to disk after a sync() or after
> > dirtytime_expire_interval.  This is fixed by the same fix.
> > 
> > This supersedes previously proposed fixes, including
> > https://lore.kernel.org/r/20200307020043.60118-1-tytso@mit.edu and
> > https://lore.kernel.org/r/20200325122825.1086872-3-hch@lst.de from last
> > year (which had some issues and didn't fix the XFS bug), and v1 of this
> > patchset which took a different approach
> > (https://lore.kernel.org/r/20210105005452.92521-1-ebiggers@kernel.org).
> > 
> > Patches 2-12 then clean up various things related to lazytime and
> > writeback, such as clarifying the semantics of ->dirty_inode() and the
> > inode dirty flags, and improving comments.  Most of these patches could
> > be applied independently if needed.
> > 
> > This patchset applies to v5.11-rc2.
> 
> The series look good to me. How do you plan to merge it (after resolving
> Christoph's remarks)? I guess either Ted can take it through the ext4 tree
> or I can take it through my tree...
> 

I think taking it through your tree would be best, unless Al or Ted wants to
take it.

I'll probably separate out
"xfs: remove a stale comment from xfs_file_aio_write_checks()",
since it isn't really related anymore and could go in through the XFS tree.

- Eric