On Tue, 29 Jan 2008 16:49:02 +0100 Miklos Szeredi <miklos@xxxxxxxxxx> wrote:
> From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
>
> Provide a place in sysfs (/sys/class/bdi) for the backing_dev_info
> object. This allows us to see and set the various BDI specific
> variables.
>
> In particular this properly exposes the read-ahead window for all
> relevant users and /sys/block/<block>/queue/read_ahead_kb should be
> deprecated.
>
> With patient help from Kay Sievers and Greg KH
>
> [mszeredi@xxxxxxx]
>
> - split off NFS and FUSE changes into separate patches
> - document new sysfs attributes under Documentation/ABI
> - do bdi_class_init as a core_initcall, otherwise the "default" BDI
> won't be initialized
> - remove bdi_init_fmt macro, it's not used very much
please always provide diffstats.
Documentation/ABI/testing/sysfs-class-bdi | 50 +++++++++++++
block/genhd.c | 3
include/linux/backing-dev.h | 8 ++
include/linux/writeback.h | 3
lib/percpu_counter.c | 1
mm/backing-dev.c | 108 ++++++++++++++++++++++++++++++
mm/page-writeback.c | 2
mm/readahead.c | 8 +-
8 files changed, 181 insertions(+), 2 deletions(-)
would you believe this breaks ia64 allmodconfig, in the usual place:
In file included from arch/ia64/ia32/sys_ia32.c:59:
arch/ia64/ia32/ia32priv.h:342:1: warning: "SET_PERSONALITY" redefined
In file included from include/linux/elf.h:7,
from include/linux/module.h:14,
from include/linux/device.h:21,
from include/linux/backing-dev.h:15,
from include/linux/nfs_fs_sb.h:5,
from include/linux/nfs_fs.h:50,
from arch/ia64/ia32/sys_ia32.c:35:
include/asm/elf.h:180:1: warning: this is the location of the previous definition
We keep on hitting stupid build errors in this area: ia64 and elf. It is
obviously quite fragile. It would be nice to fix it properly.
For now, the easy fix:
--- a/include/linux/backing-dev.h~mm-bdi-export-bdi-attributes-in-sysfs-ia64-fix
+++ a/include/linux/backing-dev.h
@@ -12,10 +12,10 @@
#include <linux/log2.h>
#include <linux/proportions.h>
#include <linux/kernel.h>
-#include <linux/device.h>
#include <asm/atomic.h>
struct page;
+struct device;
/*
* Bits in backing_dev_info.state
--
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