Files
linux/lib
Al Viro 2dcedb2a54 ITER_PIPE: helper for getting pipe buffer by index
pipe_buffer instances of a pipe are organized as a ring buffer,
with power-of-2 size.  Indices are kept *not* reduced modulo ring
size, so the buffer refered to by index N is
	pipe->bufs[N & (pipe->ring_size - 1)].

Ring size can change over the lifetime of a pipe, but not while
the pipe is locked.  So for any iov_iter primitives it's a constant.
Original conversion of pipes to this layout went overboard trying
to microoptimize that - calculating pipe->ring_size - 1, storing
it in a local variable and using through the function.  In some
cases it might be warranted, but most of the times it only
obfuscates what's going on in there.

Introduce a helper (pipe_buf(pipe, N)) that would encapsulate
that and use it in the obvious cases.  More will follow...

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2022-08-08 22:37:16 -04:00
..
2022-05-09 17:20:37 -07:00
2021-07-08 11:48:20 -07:00
2021-09-08 11:50:26 -07:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-11-18 13:16:22 -08:00
2021-05-06 19:24:12 -07:00
2021-01-21 14:06:00 -07:00
2022-03-07 12:48:35 -07:00
2021-08-19 09:02:55 +09:00
2022-04-22 21:30:57 +02:00
2021-01-03 20:05:18 -05:00
2022-01-15 08:47:31 -08:00
2022-03-07 12:48:35 -07:00
2022-04-29 14:38:01 -07:00
2022-07-10 13:55:49 -07:00
2021-08-19 09:02:55 +09:00
2022-06-12 14:51:51 +08:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2022-06-12 14:51:51 +08:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-08-08 13:00:20 +01:00
2021-09-17 13:52:17 +01:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2022-04-29 14:38:01 -07:00
2021-06-18 11:43:09 +02:00
2021-07-08 11:48:20 -07:00
2022-01-20 08:52:54 +02:00