From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Thu, 10 Aug 2006 21:51:46 +0000 (-0400)
Subject: SUNRPC: rpc_unlink() must check for unhashed dentries
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=68adb0af51ebccb72ffb14d49cb8121b1afc4259;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

SUNRPC: rpc_unlink() must check for unhashed dentries

A prior call to rpc_depopulate() by rpc_rmdir() on the parent directory may
have already called simple_unlink() on this entry.
Add the same check to rpc_rmdir(). Also remove a redundant call to
rpc_close_pipes() in rpc_rmdir.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
(cherry picked from 0bbfb9d20f6437c4031aa3bf9b4d311a053e58e3 commit)
---

diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 9c355e1ae61..0b1a1ac8a4b 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -539,6 +539,7 @@ repeat:
 				rpc_close_pipes(dentry->d_inode);
 				simple_unlink(dir, dentry);
 			}
+			inode_dir_notify(dir, DN_DELETE);
 			dput(dentry);
 		} while (n);
 		goto repeat;
@@ -610,8 +611,8 @@ __rpc_rmdir(struct inode *dir, struct dentry *dentry)
 	int error;
 
 	shrink_dcache_parent(dentry);
-	if (dentry->d_inode)
-		rpc_close_pipes(dentry->d_inode);
+	if (d_unhashed(dentry))
+		return 0;
 	if ((error = simple_rmdir(dir, dentry)) != 0)
 		return error;
 	if (!error) {
@@ -747,13 +748,15 @@ rpc_unlink(struct dentry *dentry)
 	parent = dget_parent(dentry);
 	dir = parent->d_inode;
 	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
-	d_drop(dentry);
-	if (dentry->d_inode) {
-		rpc_close_pipes(dentry->d_inode);
-		error = simple_unlink(dir, dentry);
+	if (!d_unhashed(dentry)) {
+		d_drop(dentry);
+		if (dentry->d_inode) {
+			rpc_close_pipes(dentry->d_inode);
+			error = simple_unlink(dir, dentry);
+		}
+		inode_dir_notify(dir, DN_DELETE);
 	}
 	dput(dentry);
-	inode_dir_notify(dir, DN_DELETE);
 	mutex_unlock(&dir->i_mutex);
 	dput(parent);
 	return error;