tree e8069cc17f887ad86f8dee0d96640a2f19bf4112
parent 3a326a2ce88e71d00ac0d133e314a3342a7709f8
author Ingo Molnar <mingo@elte.hu> 1144675138 +0200
committer Jens Axboe <axboe@suse.de> 1144675138 +0200

[PATCH] splice: add optional input and output offsets

add optional input and output offsets to sys_splice(), for seekable file
descriptors:

 asmlinkage long sys_splice(int fd_in, loff_t __user *off_in,
                            int fd_out, loff_t __user *off_out,
                            size_t len, unsigned int flags);

semantics are straightforward: f_pos will be updated with the offset
provided by user-space, before the splice transfer is about to begin.
Providing a NULL offset pointer means the existing f_pos will be used
(and updated in situ).  Providing an offset for a pipe results in
-ESPIPE. Providing an invalid offset pointer results in -EFAULT.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jens Axboe <axboe@suse.de>