Re: btrfs send/receive review by vfs folks

[Martin Steigerwald <Martin@lichtvoll.de>]

Am Donnerstag, 4. Oktober 2012 schrieb Alex Lyakas:
> Hi Jan,
> as I promised, here is some code for you to look at.
> 
> First I will describe the approach in general.
> 
> # Get rid of the pipe. Instead, user-space passes a buffer and kernel
> fills the specified user-space buffer with commands.
> # When the buffer is full, kernel stops generating commands and
> returns a checkpoint to the user-space.

Can it just fill a second buffer while userspace command handles the first?

> # User-space does whatever it wants with the returned buffer, and then
> calls the kernel again, with a buffer and a checkpoint that was
> returned by the kernel from previous SEND ioctl().
> # Kernel re-arms itself to the specified checkpoint, and fills the
> specified buffer with commands, attaches a new checkpoint and so on.
> # Eventually kernel signals to the user that there are no more
> commands.

Thanks,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7