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SubjectRe: [PATCH 18/19] btrfs: only dirty the inode in btrfs_update_time if something was changed
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On Wed, 2017-12-13 at 09:20 -0500, Jeff Layton wrote:
> From: Jeff Layton <jlayton@redhat.com>
>
> At this point, we know that "now" and the file times may differ, and we
> suspect that the i_version has been flagged to be bumped. Attempt to
> bump the i_version, and only mark the inode dirty if that actually
> occurred or if one of the times was updated.
>
> Signed-off-by: Jeff Layton <jlayton@redhat.com>
> ---
> fs/btrfs/inode.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index ac25389b39de..2e50a977fb06 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -6106,19 +6106,20 @@ static int btrfs_update_time(struct inode *inode, struct timespec *now,
> int flags)
> {
> struct btrfs_root *root = BTRFS_I(inode)->root;
> + bool dirty = flags & ~S_VERSION;
>
> if (btrfs_root_readonly(root))
> return -EROFS;
>
> if (flags & S_VERSION)
> - inode_inc_iversion(inode);
> + dirty |= inode_maybe_inc_iversion(inode, dirty);
> if (flags & S_CTIME)
> inode->i_ctime = *now;
> if (flags & S_MTIME)
> inode->i_mtime = *now;
> if (flags & S_ATIME)
> inode->i_atime = *now;
> - return btrfs_dirty_inode(inode);
> + return dirty ? btrfs_dirty_inode(inode) : 0;
> }
>
> /*

I had some bogus handling for SB_LAZYTIME in the corresponding patch for
generic_update_time. I've fixed in my tree, but now I'm wondering...

Should btrfs not be dirtying the inode here if SB_LAZYTIME is set and
the only update is to the atime?
--
Jeff Layton <jlayton@kernel.org>

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