linux-kernel - [tip:tracing/core] tracing: update file->f

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Date:	Fri, 10 Apr 2009 11:07:13 GMT
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	fweisbec@...il.com, srostedt@...hat.com, tglx@...utronix.de,
	laijs@...fujitsu.com, mingo@...e.hu
Subject: [tip:tracing/core] tracing: update file->f_pos when splice(2) it

Commit-ID:  c7625a555f55d7ae49236cde551786c88f5a5ce1
Gitweb:     http://git.kernel.org/tip/c7625a555f55d7ae49236cde551786c88f5a5ce1
Author:     Lai Jiangshan <laijs@...fujitsu.com>
AuthorDate: Thu, 2 Apr 2009 15:17:04 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 10 Apr 2009 12:44:44 +0200

tracing: update file->f_pos when splice(2) it

Impact: Cleanup

These two lines:

	if (unlikely(*ppos))
		return -ESPIPE;

in tracing_buffers_splice_read() are not needed, VFS layer
has disabled seek(2).

We remove these two lines, and then we can update file->f_pos.

And tracing_buffers_read() updates file->f_pos, this fix
make tracing_buffers_splice_read() updates file->f_pos too.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Steven Rostedt <srostedt@...hat.com>
LKML-Reference: <49D46670.4010503@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/trace/trace.c |    8 +-------
 1 files changed, 1 insertions(+), 7 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8e189ff..9462976 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3428,13 +3428,6 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
 	int size, i;
 	size_t ret;
 
-	/*
-	 * We can't seek on a buffer input
-	 */
-	if (unlikely(*ppos))
-		return -ESPIPE;
-
-
 	for (i = 0; i < PIPE_BUFFERS && len; i++, len -= size) {
 		struct page *page;
 		int r;
@@ -3474,6 +3467,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
 		spd.partial[i].offset = 0;
 		spd.partial[i].private = (unsigned long)ref;
 		spd.nr_pages++;
+		*ppos += size;
 	}
 
 	spd.nr_pages = i;
--
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