linux-kernel - [PATCH] splice: update mtime and atime on files

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Message-Id: <E1MbyLM-0006Xd-OE@pomaz-ex.szeredi.hu>
Date:	Fri, 14 Aug 2009 17:05:24 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	jens.axboe@...cle.com
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: [PATCH] splice: update mtime and atime on files

From: Miklos Szeredi <mszeredi@...e.cz>

Splice should update the modification and access times on regular
files just like read and write.  Not updating mtime will confuse
backup tools, etc...

This patch only adds the time updates for regular files.  For pipes
and other special files that splice touches the need for updating the
times is less clear.  Let's discuss and fix that separately.

Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
---
 fs/splice.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Index: linux-2.6/fs/splice.c
===================================================================
--- linux-2.6.orig/fs/splice.c	2009-07-03 13:12:06.000000000 +0200
+++ linux-2.6/fs/splice.c	2009-07-21 17:58:52.000000000 +0200
@@ -502,8 +502,10 @@ ssize_t generic_file_splice_read(struct
 		len = left;
 
 	ret = __generic_file_splice_read(in, ppos, pipe, len, flags);
-	if (ret > 0)
+	if (ret > 0) {
 		*ppos += ret;
+		file_accessed(in);
+	}
 
 	return ret;
 }
@@ -963,8 +965,10 @@ generic_file_splice_write(struct pipe_in
 
 		mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
 		ret = file_remove_suid(out);
-		if (!ret)
+		if (!ret) {
+			file_update_time(out);
 			ret = splice_from_pipe_feed(pipe, &sd, pipe_to_file);
+		}
 		mutex_unlock(&inode->i_mutex);
 	} while (ret > 0);
 	splice_from_pipe_end(pipe, &sd);
--
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