[BLOCK] Move all core block layer code to new block/ directory

drivers/block/ is right now a mix of core and driver parts. Lets move
the core parts to a new top level directory. Al will move the fs/
related block parts to block/ next.

Signed-off-by: Jens Axboe <axboe@suse.de>

1 files changed, 69 insertions, 0 deletions

diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
new file mode 100644
index 000000000000..5b90d2fa63b8
--- /dev/null
+++ b/block/Kconfig.iosched
@@ -0,0 +1,69 @@
+
+menu "IO Schedulers"
+
+config IOSCHED_NOOP
+        bool
+        default y
+        ---help---
+          The no-op I/O scheduler is a minimal scheduler that does basic merging
+          and sorting. Its main uses include non-disk based block devices like
+          memory devices, and specialised software or hardware environments
+          that do their own scheduling and require only minimal assistance from
+          the kernel.
+
+config IOSCHED_AS
+        tristate "Anticipatory I/O scheduler"
+        default y
+        ---help---
+          The anticipatory I/O scheduler is the default disk scheduler. It is
+          generally a good choice for most environments, but is quite large and
+          complex when compared to the deadline I/O scheduler, it can also be
+          slower in some cases especially some database loads.
+
+config IOSCHED_DEADLINE
+        tristate "Deadline I/O scheduler"
+        default y
+        ---help---
+          The deadline I/O scheduler is simple and compact, and is often as
+          good as the anticipatory I/O scheduler, and in some database
+          workloads, better. In the case of a single process performing I/O to
+          a disk at any one time, its behaviour is almost identical to the
+          anticipatory I/O scheduler and so is a good choice.
+
+config IOSCHED_CFQ
+        tristate "CFQ I/O scheduler"
+        default y
+        ---help---
+          The CFQ I/O scheduler tries to distribute bandwidth equally
+          among all processes in the system. It should provide a fair
+          working environment, suitable for desktop systems.
+
+choice
+        prompt "Default I/O scheduler"
+        default DEFAULT_AS
+        help
+          Select the I/O scheduler which will be used by default for all
+          block devices.
+
+        config DEFAULT_AS
+                bool "Anticipatory" if IOSCHED_AS
+
+        config DEFAULT_DEADLINE
+                bool "Deadline" if IOSCHED_DEADLINE
+
+        config DEFAULT_CFQ
+                bool "CFQ" if IOSCHED_CFQ
+
+        config DEFAULT_NOOP
+                bool "No-op"
+
+endchoice
+
+config DEFAULT_IOSCHED
+        string
+        default "anticipatory" if DEFAULT_AS
+        default "deadline" if DEFAULT_DEADLINE
+        default "cfq" if DEFAULT_CFQ
+        default "noop" if DEFAULT_NOOP
+
+endmenu