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, 3 insertions, 3 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 2a239d878e85..a853a89857a5 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -809,14 +809,14 @@ inode_has_hashed_dentries(struct inode *inode)
 {
         struct dentry *dentry;
 
-        spin_lock(&dcache_inode_lock);
+        spin_lock(&inode->i_lock);
         list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
                 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
-                        spin_unlock(&dcache_inode_lock);
+                        spin_unlock(&inode->i_lock);
                         return true;
                 }
         }
-        spin_unlock(&dcache_inode_lock);
+        spin_unlock(&inode->i_lock);
         return false;
 }