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

Browse source 
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@cn.fujitsu.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <srostedt@redhat.com>
LKML-Reference: <49D46670.4010503@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Lai Jiangshan 2009-04-02 15:17:04 +08:00 committed by Ingo Molnar
parent ddd538f3e6
commit c7625a555f
1 changed files with 1 additions and 7 deletions
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8
kernel/trace/trace.c
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@ -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;