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Subject[PATCH 08/23] block: implement add_bdi_stat()
Date
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

We're going to add/remove a number of page cache entries at once. This
patch implements add_bdi_stat() which adjusts bdi stats by arbitrary
amount. It's required for batched page cache manipulations.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/backing-dev.h | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index c388155..7060180 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -166,6 +166,16 @@ static inline void __dec_bdi_stat(struct backing_dev_info *bdi,
__add_bdi_stat(bdi, item, -1);
}

+static inline void add_bdi_stat(struct backing_dev_info *bdi,
+ enum bdi_stat_item item, s64 amount)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ __add_bdi_stat(bdi, item, amount);
+ local_irq_restore(flags);
+}
+
static inline void dec_bdi_stat(struct backing_dev_info *bdi,
enum bdi_stat_item item)
{
--
1.8.3.2


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