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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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6
include/linux/sched.h
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@ -684,6 +684,7 @@ static inline void prefetch_stack(struct task_struct *t) { }
struct audit_context; /* See audit.c */
struct mempolicy;
struct pipe_inode_info;
enum sleep_type {
SLEEP_NORMAL,
@ -882,6 +883,11 @@ struct task_struct {
atomic_t fs_excl; /* holding fs exclusive resources */
struct rcu_head rcu;
/*
* cache last used pipe for splice
*/
struct pipe_inode_info *splice_pipe;
};
static inline pid_t process_group(struct task_struct *tsk)