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vmsplice: add vmsplice-to-user support

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A bit of a cheat, it actually just copies the data to userspace. But
this makes the interface nice and symmetric and enables people to build
on splice, with room for future improvement in performance.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-06-14 13:08:55 +02:00
parent c66ab6fa70
commit 6a14b90bb6
3 changed files with 158 additions and 30 deletions
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8
include/linux/pipe_fs_i.h
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@ -88,7 +88,13 @@ int generic_pipe_buf_steal(struct pipe_inode_info *, struct pipe_buffer *);
struct splice_desc {
unsigned int len, total_len; /* current and remaining length */
unsigned int flags; /* splice flags */
struct file *file; /* file to read/write */
/*
* actor() private data
*/
union {
void __user *userptr; /* memory to write to */
struct file *file; /* file to read/write */
} u;
loff_t pos; /* file position */
};