buffer: make touch_buffer() an exported function
We want to add a trace point to touch_buffer() but macros and inline
functions defined in header files can't have tracing points. Move
touch_buffer() to fs/buffer.c and make it a proper function.
The new exported function is also declared inline. As most uses of
touch_buffer() are inside buffer.c with nilfs2 as the only other user,
the effect of this change should be negligible.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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