fs: dcache per-inode inode alias locking

dcache_inode_lock can be replaced with per-inode locking. Use existing
inode->i_lock for this. This is slightly non-trivial because we sometimes
need to find the inode from the dentry, which requires d_inode to be
stabilised (either with refcount or d_lock).

Signed-off-by: Nick Piggin <npiggin@kernel.dk>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
index 0310b16a7238..6d80ecc7834f 100644
--- a/fs/ocfs2/dcache.c
+++ b/fs/ocfs2/dcache.c
@@ -175,7 +175,7 @@ struct dentry *ocfs2_find_local_alias(struct inode *inode,
         struct list_head *p;
         struct dentry *dentry = NULL;
 
-        spin_lock(&dcache_inode_lock);
+        spin_lock(&inode->i_lock);
         list_for_each(p, &inode->i_dentry) {
                 dentry = list_entry(p, struct dentry, d_alias);
 
@@ -193,7 +193,7 @@ struct dentry *ocfs2_find_local_alias(struct inode *inode,
                 dentry = NULL;
         }
 
-        spin_unlock(&dcache_inode_lock);
+        spin_unlock(&inode->i_lock);
 
         return dentry;
 }