linux-toradex.git/include/linux/pipe_fs_i.h, branch v2.6.30-rc5

splice: add helpers for locking pipe inode

2009-04-15T10:10:12+00:00

There are lots of sequences like this, especially in splice code:

	if (pipe->inode)
		mutex_lock(&pipe->inode->i_mutex);
	/* do something */
	if (pipe->inode)
		mutex_unlock(&pipe->inode->i_mutex);

so introduce helpers which do the conditional locking and unlocking.
Also replace the inode_double_lock() call with a pipe_double_lock()
helper to avoid spreading the use of this functionality beyond the
pipe code.

This patch is just a cleanup, and should cause no behavioral changes.

Signed-off-by: Miklos Szeredi 
Signed-off-by: Jens Axboe

pipe: add documentation and comments

2007-07-10T06:04:16+00:00

As per Andrew Mortons request, here's a set of documentation for
the generic pipe_buf_operations hooks, the pipe, and pipe_buffer
structures.

Signed-off-by: Jens Axboe

pipe: change the ->pin() operation to ->confirm()

2007-07-10T06:04:15+00:00

The name 'pin' was badly chosen, it doesn't pin a pipe buffer
in the most commonly used sense in the kernel. So change the
name to 'confirm', after debating this issue with Hugh
Dickins a bit.

A good return from ->confirm() means that the buffer is really
there, and that the contents are good.

Signed-off-by: Jens Axboe

pipe: allow passing around of ops private pointer

2007-07-10T06:04:14+00:00

relay needs this for proper consumption handling, and the network
receive support needs it as well to lookup the sk_buff on pipe
release.

Signed-off-by: Jens Axboe

splice: divorce the splice structure/function definitions from the pipe header

2007-07-10T06:04:14+00:00

We need to move even more stuff into the header so that folks can use
the splice_to_pipe() implementation instead of open-coding a lot of
pipe knowledge (see relay implementation), so move to our own header
file finally.

Signed-off-by: Jens Axboe

splice: add void cookie to the actor data

2007-07-10T06:04:14+00:00

We need that for passing driver private info.

Signed-off-by: Jens Axboe

vmsplice: add vmsplice-to-user support

2007-07-10T06:04:12+00:00

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

splice: abstract out actor data

2007-07-10T06:04:12+00:00

For direct splicing (or private splicing), the output may not be a file.
So abstract out the handling into a specified actor function and put
the data in the splice_desc structure earlier, so we can build on top
of that.

This is the first step in better splice handling for drivers, and also
for implementing vmsplice _to_ user memory.

Signed-off-by: Jens Axboe

pipe: move pipe_inode_info structure decleration up before it's used

2007-06-08T06:33:53+00:00

There's really no reason it's below the first use of the pointer
type, and it'll fail compilation for the network addition (for good
reason). So move it up a bit.

Signed-off-by: Jens Axboe

Export __splice_from_pipe()

2007-03-27T06:55:47+00:00

Ocfs2 wants to implement it's own splice write actor so that it can better
manage cluster / page locks. This lets us re-use the rest of splice write
while only providing our own code where it's actually important.

Signed-off-by: Mark Fasheh 
Signed-off-by: Jens Axboe