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[PATCH] splice: add direct fd <-> fd splicing support

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It's more efficient for sendfile() emulation. Basically we cache an
internal private pipe and just use that as the intermediate area for
pages. Direct splicing is not available from sys_splice(), it is only
meant to be used for sendfile() emulation.

Additional patch from Ingo Molnar to avoid the PIPE_BUFFERS loop at
exit for the normal fast path.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe
2006-04-11 13:52:07 +02:00
parent 529565dcb1
commit b92ce55893
6 changed files with 150 additions and 21 deletions
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4
kernel/exit.c
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@ -34,6 +34,7 @@
#include <linux/mutex.h>
#include <linux/futex.h>
#include <linux/compat.h>
#include <linux/pipe_fs_i.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
@ -941,6 +942,9 @@ fastcall NORET_TYPE void do_exit(long code)
if (tsk->io_context)
exit_io_context();
if (tsk->splice_pipe)
__free_pipe_info(tsk->splice_pipe);
/* PF_DEAD causes final put_task_struct after we schedule. */
preempt_disable();
BUG_ON(tsk->flags & PF_DEAD);