vfs: conditionally call inode_wb_list_del()
Some inodes (pipes, sockets, ...) are not in bdi writeback list.
evict() can avoid calling inode_wb_list_del() and its expensive spinlock
by checking inode i_wb_list being empty or not.
At this point, no other cpu/user can concurrently manipulate this inode
i_wb_list
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/inode.c b/fs/inode.c
index d0c72ff..9dab13a 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -454,7 +454,9 @@
BUG_ON(!(inode->i_state & I_FREEING));
BUG_ON(!list_empty(&inode->i_lru));
- inode_wb_list_del(inode);
+ if (!list_empty(&inode->i_wb_list))
+ inode_wb_list_del(inode);
+
inode_sb_list_del(inode);
if (op->evict_inode) {