From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 14 Apr 2016 23:40:56 +0000 (-0400)
Subject: __d_add(): don't drop/regain ->d_lock
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=0568d705b0087751f0c085c0a665aa3e954c810d;p=openwrt%2Fstaging%2Fblogic.git

__d_add(): don't drop/regain ->d_lock

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/dcache.c b/fs/dcache.c
index 4962a7b4384e..20394fb6f967 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2366,11 +2366,19 @@ EXPORT_SYMBOL(d_rehash);
 
 static inline void __d_add(struct dentry *dentry, struct inode *inode)
 {
+	spin_lock(&dentry->d_lock);
 	if (inode) {
-		__d_instantiate(dentry, inode);
+		unsigned add_flags = d_flags_for_inode(inode);
+		hlist_add_head(&dentry->d_u.d_alias, &inode->i_dentry);
+		raw_write_seqcount_begin(&dentry->d_seq);
+		__d_set_inode_and_type(dentry, inode, add_flags);
+		raw_write_seqcount_end(&dentry->d_seq);
+		__fsnotify_d_instantiate(dentry);
+	}
+	_d_rehash(dentry);
+	spin_unlock(&dentry->d_lock);
+	if (inode)
 		spin_unlock(&inode->i_lock);
-	}
-	d_rehash(dentry);
 }
 
 /**