Patchwork [3/9] xfs: factor out everything but the filemap_write_and_wait from xfs_file_fsync

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Submitter Darrick J. Wong
Date Nov. 20, 2012, 7:41 a.m.
Message ID <20121120074138.24645.36708.stgit@blackbox.djwong.org>
Download mbox | patch
Permalink /patch/200240/
State New
Headers show

Comments

Darrick J. Wong - Nov. 20, 2012, 7:41 a.m.
Hi,

Fsyncing is tricky business, so factor out the bits of the xfs_file_fsync
function that can be used from the I/O post-processing path.

From: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
---
 fs/xfs/xfs_file.c  |   44 +++++++++++++++++++++++++++++---------------
 fs/xfs/xfs_inode.h |    1 +
 2 files changed, 30 insertions(+), 15 deletions(-)



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Dave Chinner - Nov. 20, 2012, 10:47 a.m.
On Mon, Nov 19, 2012 at 11:41:38PM -0800, Darrick J. Wong wrote:
> Hi,
> 
> Fsyncing is tricky business, so factor out the bits of the xfs_file_fsync
> function that can be used from the I/O post-processing path.
> 
> From: Jeff Moyer <jmoyer@redhat.com>
> Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
> ---
>  fs/xfs/xfs_file.c  |   44 +++++++++++++++++++++++++++++---------------
>  fs/xfs/xfs_inode.h |    1 +
>  2 files changed, 30 insertions(+), 15 deletions(-)
> 
> 
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index aa473fa..507f446 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -152,25 +152,18 @@ xfs_dir_fsync(
>  	return _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL);
>  }
>  
> -STATIC int
> -xfs_file_fsync(
> -	struct file		*file,
> -	loff_t			start,
> -	loff_t			end,
> +/*
> + * Returns 0 on success, -errno on failure.
> + */
> +int
> +do_xfs_file_fsync(
> +	struct xfs_inode	*ip,
> +	struct xfs_mount	*mp,
>  	int			datasync)

xfs_do_file_fsync()

And being an internal XFS function, it should return a positive
error number.

....

> +{
> +	struct inode		*inode = file->f_mapping->host;
> +	struct xfs_inode	*ip = XFS_I(inode);
> +	struct xfs_mount	*mp = ip->i_mount;
> +	int			error = 0;
> +
> +	trace_xfs_file_fsync(ip);
> +
> +	error = filemap_write_and_wait_range(inode->i_mapping, start, end);
> +	if (error)
> +		return error;
> +
> +	return do_xfs_file_fsync(ip, mp, datasync);

And be negated here.

> +}
> +
>  STATIC ssize_t
>  xfs_file_aio_read(
>  	struct kiocb		*iocb,
> diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
> index 94b32f9..d5bf105 100644
> --- a/fs/xfs/xfs_inode.h
> +++ b/fs/xfs/xfs_inode.h
> @@ -546,6 +546,7 @@ do { \
>  	iput(VFS_I(ip)); \
>  } while (0)
>  
> +int	do_xfs_file_fsync(struct xfs_inode *, struct xfs_mount *, int);
>  #endif /* __KERNEL__ */

This should probably go in fs/xfs/xfs_vnodeops.h (like the only
other non-static function (xfs_zero_eof) in fs/xfs/xfs_file.c is.

Cheers,

Dave.
Christoph Hellwig - Nov. 21, 2012, 10:09 a.m.
On Mon, Nov 19, 2012 at 11:41:38PM -0800, Darrick J. Wong wrote:
> Hi,
> 
> Fsyncing is tricky business, so factor out the bits of the xfs_file_fsync
> function that can be used from the I/O post-processing path.

Why would we need to skip the filemap_write_and_wait_range call here?
If we're doing direct I/O we should not have any pages in this regions
anyway.  You're also not skipping it in the generic implementation as
far as I can see, so I see no point in doing it just in XFS.
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Jeff Moyer - Nov. 21, 2012, 2:10 p.m.
Christoph Hellwig <hch@infradead.org> writes:

> On Mon, Nov 19, 2012 at 11:41:38PM -0800, Darrick J. Wong wrote:
>> Hi,
>> 
>> Fsyncing is tricky business, so factor out the bits of the xfs_file_fsync
>> function that can be used from the I/O post-processing path.
>
> Why would we need to skip the filemap_write_and_wait_range call here?
> If we're doing direct I/O we should not have any pages in this regions
> anyway.  You're also not skipping it in the generic implementation as
> far as I can see, so I see no point in doing it just in XFS.

OK, I'll fix that.

Thanks!
Jeff
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Patch

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index aa473fa..507f446 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -152,25 +152,18 @@  xfs_dir_fsync(
 	return _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL);
 }
 
-STATIC int
-xfs_file_fsync(
-	struct file		*file,
-	loff_t			start,
-	loff_t			end,
+/*
+ * Returns 0 on success, -errno on failure.
+ */
+int
+do_xfs_file_fsync(
+	struct xfs_inode	*ip,
+	struct xfs_mount	*mp,
 	int			datasync)
 {
-	struct inode		*inode = file->f_mapping->host;
-	struct xfs_inode	*ip = XFS_I(inode);
-	struct xfs_mount	*mp = ip->i_mount;
-	int			error = 0;
 	int			log_flushed = 0;
 	xfs_lsn_t		lsn = 0;
-
-	trace_xfs_file_fsync(ip);
-
-	error = filemap_write_and_wait_range(inode->i_mapping, start, end);
-	if (error)
-		return error;
+	int			error = 0;
 
 	if (XFS_FORCED_SHUTDOWN(mp))
 		return -XFS_ERROR(EIO);
@@ -222,6 +215,27 @@  xfs_file_fsync(
 	return -error;
 }
 
+STATIC int
+xfs_file_fsync(
+	struct file		*file,
+	loff_t			start,
+	loff_t			end,
+	int			datasync)
+{
+	struct inode		*inode = file->f_mapping->host;
+	struct xfs_inode	*ip = XFS_I(inode);
+	struct xfs_mount	*mp = ip->i_mount;
+	int			error = 0;
+
+	trace_xfs_file_fsync(ip);
+
+	error = filemap_write_and_wait_range(inode->i_mapping, start, end);
+	if (error)
+		return error;
+
+	return do_xfs_file_fsync(ip, mp, datasync);
+}
+
 STATIC ssize_t
 xfs_file_aio_read(
 	struct kiocb		*iocb,
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 94b32f9..d5bf105 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -546,6 +546,7 @@  do { \
 	iput(VFS_I(ip)); \
 } while (0)
 
+int	do_xfs_file_fsync(struct xfs_inode *, struct xfs_mount *, int);
 #endif /* __KERNEL__ */
 
 /*