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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
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/fs.h
View file

@ -1613,6 +1613,8 @@ extern void do_generic_mapping_read(struct address_space *mapping,
loff_t *, read_descriptor_t *, read_actor_t);
extern ssize_t generic_file_splice_read(struct file *, struct pipe_inode_info *, size_t, unsigned int);
extern ssize_t generic_file_splice_write(struct pipe_inode_info *, struct file *, size_t, unsigned int);
extern long do_splice_direct(struct file *in, struct file *out,
size_t len, unsigned int flags);
extern void
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov,

1
include/linux/pipe_fs_i.h
View file

@ -58,6 +58,7 @@ void pipe_wait(struct pipe_inode_info *pipe);
struct pipe_inode_info * alloc_pipe_info(struct inode * inode);
void free_pipe_info(struct inode * inode);
void __free_pipe_info(struct pipe_inode_info *);
/*
* splice is tied to pipes as a transport (at least for now), so we'll just

6
include/linux/sched.h
View file

@ -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)