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2012-11-01sk-filter: Add ability to get socket filter program (v2)Pavel Emelyanov
The SO_ATTACH_FILTER option is set only. I propose to add the get ability by using SO_ATTACH_FILTER in getsockopt. To be less irritating to eyes the SO_GET_FILTER alias to it is declared. This ability is required by checkpoint-restore project to be able to save full state of a socket. There are two issues with getting filter back. First, kernel modifies the sock_filter->code on filter load, thus in order to return the filter element back to user we have to decode it into user-visible constants. Fortunately the modification in question is interconvertible. Second, the BPF_S_ALU_DIV_K code modifies the command argument k to speed up the run-time division by doing kernel_k = reciprocal(user_k). Bad news is that different user_k may result in same kernel_k, so we can't get the original user_k back. Good news is that we don't have to do it. What we need to is calculate a user2_k so, that reciprocal(user2_k) == reciprocal(user_k) == kernel_k i.e. if it's re-loaded back the compiled again value will be exactly the same as it was. That said, the user2_k can be calculated like this user2_k = reciprocal(kernel_k) with an exception, that if kernel_k == 0, then user2_k == 1. The optlen argument is treated like this -- when zero, kernel returns the amount of sock_fprog elements in filter, otherwise it should be large enough for the sock_fprog array. changes since v1: * Declared SO_GET_FILTER in all arch headers * Added decode of vlan-tag codes Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-25tty, ioctls -- Add new ioctl definitions for tty flags fetchingCyrill Gorcunov
This patch defines new ioctl codes TIOCGPKT, TIOCGPTLCK, TIOCGEXCL for fetching pty's packet mode and locking state, and exclusive mode of tty. [ No real handlers for the codes though, this will be addressed in another patch for easier review and bisectability ] Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> CC: Alan Cox <alan@lxorguk.ukuu.org.uk> CC: "H. Peter Anvin" <hpa@zytor.com> CC: Pavel Emelyanov <xemul@parallels.com> CC: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-10-17UAPI: Put a comment into uapi/asm-generic/kvm_para.h and use it from archesDavid Howells
Make uapi/asm-generic/kvm_para.h non-empty by addition of a comment to stop the patch program from deleting it when it creates it. Then delete empty arch-specific uapi/asm/kvm_para.h files and tell the Kbuild files to use the generic instead. Should this perhaps instead be a #warning or #error that the facility is unsupported on this arch? Signed-off-by: David Howells <dhowells@redhat.com> cc: Arnd Bergmann <arnd@arndb.de> cc: Avi Kivity <avi@redhat.com> cc: Marcelo Tosatti <mtosatti@redhat.com> cc: kvm@vger.kernel.org
2012-10-04UAPI: (Scripted) Disintegrate include/asm-genericDavid Howells
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
2012-10-02UAPI: Set up uapi/asm/Kbuild.asmDavid Howells
Set up uapi/asm/Kbuild.asm. This requires the mandatory headers to be dynamically detected. The same goes for include/asm/Kbuild.asm. The problem is that the header files will be split or moved one at a time, but each header file in Kbuild.asm's list applies to all arch headers of that name simultaneously. The dynamic detection of mandatory files can be undone later. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
2012-10-02UAPI: (Scripted) Set up UAPI Kbuild filesDavid Howells
Set up empty UAPI Kbuild files to be populated by the header splitter. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>