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 9c355e1..0b1a1ac 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -539,6 +539,7 @@
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 @@
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 @@
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;