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| author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2009-04-02 15:17:04 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-10 12:44:44 +0200 |
| commit | c7625a555f55d7ae49236cde551786c88f5a5ce1 (patch) | |
| tree | 4cca942d46412d708945f574ef4c4b87adf92d1d /kernel/trace/trace.c | |
| parent | ddd538f3e6a1a4bec2f6942f83a753263e6577b4 (diff) | |
| download | blackbird-op-linux-c7625a555f55d7ae49236cde551786c88f5a5ce1.tar.gz blackbird-op-linux-c7625a555f55d7ae49236cde551786c88f5a5ce1.zip | |
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@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>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | 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 8e189ffb899a..94629760dabf 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; |
