[RFC PATCH v2 1/5] BTRFS hot reloc, vfs: add one list_head field

[zwu.kernel@gmail.com]

From: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>

  Add one list_head field 'reloc_list' to accommodate
hot relocation support.

Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
---
 fs/hot_tracking.c            | 1 +
 include/linux/hot_tracking.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/hot_tracking.c b/fs/hot_tracking.c
index dbc90d4..f013182 100644
--- a/fs/hot_tracking.c
+++ b/fs/hot_tracking.c
@@ -44,6 +44,7 @@ static void hot_comm_item_init(struct hot_comm_item *ci, int type)
 	clear_bit(HOT_IN_LIST, &ci->delete_flag);
 	clear_bit(HOT_DELETING, &ci->delete_flag);
 	INIT_LIST_HEAD(&ci->track_list);
+	INIT_LIST_HEAD(&ci->reloc_list);
 	memset(&ci->hot_freq_data, 0, sizeof(struct hot_freq_data));
 	ci->hot_freq_data.avg_delta_reads = (u64) -1;
 	ci->hot_freq_data.avg_delta_writes = (u64) -1;
diff --git a/include/linux/hot_tracking.h b/include/linux/hot_tracking.h
index 1009377..98bb092 100644
--- a/include/linux/hot_tracking.h
+++ b/include/linux/hot_tracking.h
@@ -75,6 +75,7 @@ struct hot_comm_item {
 	unsigned long delete_flag;
 	struct rcu_head c_rcu;
 	struct list_head track_list;		/* link to *_map[] */
+	struct list_head reloc_list;		/* used in hot relocation*/
 };
 
 /* An item representing an inode and its access frequency */
-- 
1.7.11.7