[bch-nvm-pages v7 6/6] bcache: get allocated pages from specific owner

[Qiaowei Ren <qiaowei.ren@intel.com>]

From: Jianpeng Ma <jianpeng.ma@intel.com>

This patch implements bch_get_allocated_pages() of the buddy to be used to
get allocated pages from specific owner.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
Co-authored-by: Qiaowei Ren <qiaowei.ren@intel.com>
---
 drivers/md/bcache/nvm-pages.c | 6 ++++++
 drivers/md/bcache/nvm-pages.h | 7 ++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index c5b1811b201c..a8b3c53d7aaf 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -380,6 +380,12 @@ void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
 }
 EXPORT_SYMBOL_GPL(bch_nvm_alloc_pages);
 
+struct bch_nvm_pages_owner_head *bch_get_allocated_pages(const char *owner_uuid)
+{
+	return find_owner_head(owner_uuid, false);
+}
+EXPORT_SYMBOL_GPL(bch_get_allocated_pages);
+
 static int init_owner_info(struct bch_nvm_namespace *ns)
 {
 	struct bch_owner_list_head *owner_list_head = ns->sb->owner_list_head;
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index 4ea831894583..87b1efc301c8 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -62,7 +62,7 @@ int bch_nvm_init(void);
 void bch_nvm_exit(void);
 void *bch_nvm_alloc_pages(int order, const char *owner_uuid);
 void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid);
-
+struct bch_nvm_pages_owner_head *bch_get_allocated_pages(const char *owner_uuid);
 #else
 
 static inline struct bch_nvm_namespace *bch_register_namespace(const char *dev_path)
@@ -81,6 +81,11 @@ static inline void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
 
 static inline void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid) { }
 
+static inline struct bch_nvm_pages_owner_head *bch_get_allocated_pages(const char *owner_uuid)
+{
+	return NULL;
+}
+
 #endif /* CONFIG_BCACHE_NVM_PAGES */
 
 #endif /* _BCACHE_NVM_PAGES_H */
-- 
2.25.1