[PATCH 5/7] writeback: move the default backing_dev_info out of readahead

Jens Axboe
2009-03-12T14:35:19Z

It belongs in mm/backing-dev.c

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
mm/backing-dev.c | 27 ++++++++++++++++++++++++++-
mm/readahead.c | 25 -------------------------
2 files changed, 26 insertions(+), 26 deletions(-)

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index bf9c0e0..0096b96 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -5,10 +5,24 @@
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/mm.h>
+#include <linux/pagemap.h>
#include <linux/module.h>
#include <linux/writeback.h>
#include <linux/device.h>

+void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
+{
+}
+EXPORT_SYMBOL(default_unplug_io_fn);
+
+struct backing_dev_info default_backing_dev_info = {
+ .ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE,
+ .state = 0,
+ .capabilities = BDI_CAP_MAP_COPY,
+ .unplug_io_fn = default_unplug_io_fn,
+};
+EXPORT_SYMBOL_GPL(default_backing_dev_info);
+
static struct class *bdi_class;
DEFINE_SPINLOCK(bdi_lock);
LIST_HEAD(bdi_list);
@@ -169,9 +183,20 @@ static __init int bdi_class_init(void)
bdi_debug_init();
return 0;
}
-
postcore_initcall(bdi_class_init);

+static int __init default_bdi_init(void)
+{
+ int err;
+
+ err = bdi_init(&default_backing_dev_info);
+ if (!err)
+ bdi_register(&default_backing_dev_info, NULL, "default");
+
+ return err;
+}
+subsys_initcall(default_bdi_init);
+
int bdi_register(struct backing_dev_info *bdi, struct device *parent,
const char *fmt, ...)
{
diff --git a/mm/readahead.c b/mm/readahead.c
index bec83c1..9ce303d 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -17,19 +17,6 @@
#include <linux/pagevec.h>
#include <linux/pagemap.h>

-void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
-{
-}
-EXPORT_SYMBOL(default_unplug_io_fn);
-
-struct backing_dev_info default_backing_dev_info = {
- .ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE,
- .state = 0,
- .capabilities = BDI_CAP_MAP_COPY,
- .unplug_io_fn = default_unplug_io_fn,
-};
-EXPORT_SYMBOL_GPL(default_backing_dev_info);
-
/*
* Initialise a struct file's readahead state. Assumes that the caller has
* memset *ra to zero.
@@ -233,18 +220,6 @@ unsigned long max_sane_readahead(unsigned long nr)
+ node_page_state(numa_node_id(), NR_FREE_PAGES)) / 2);
}

-static int __init readahead_init(void)
-{
- int err;
-
- err = bdi_init(&default_backing_dev_info);
- if (!err)
- bdi_register(&default_backing_dev_info, NULL, "default");
-
- return err;
-}
-subsys_initcall(readahead_init);
-
/*
* Submit IO for the read-ahead request in file_ra_state.
*/
--
1.6.2