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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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10
fs/pipe.c
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@@ -691,12 +691,10 @@ struct pipe_inode_info * alloc_pipe_info(struct inode *inode)
return info;
}
void free_pipe_info(struct inode *inode)
void __free_pipe_info(struct pipe_inode_info *info)
{
int i;
struct pipe_inode_info *info = inode->i_pipe;
inode->i_pipe = NULL;
for (i = 0; i < PIPE_BUFFERS; i++) {
struct pipe_buffer *buf = info->bufs + i;
if (buf->ops)
@@ -707,6 +705,12 @@ void free_pipe_info(struct inode *inode)
kfree(info);
}
void free_pipe_info(struct inode *inode)
{
__free_pipe_info(inode->i_pipe);
inode->i_pipe = NULL;
}
static struct vfsmount *pipe_mnt __read_mostly;
static int pipefs_delete_dentry(struct dentry *dentry)
{