Merge tag 'localmodconfig-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git...

[karo-tx-linux.git] / fs / cifs / cifsfs.c

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 1a052c0eee8eae9181e0e58ac5d0ff8852c0db8e..345fc89c4286985ed55cd972410c287a09c440f3 100644 (file)
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -91,6 +91,30 @@ struct workqueue_struct      *cifsiod_wq;
 __u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
 #endif
 
+/*
+ * Bumps refcount for cifs super block.
+ * Note that it should be only called if a referece to VFS super block is
+ * already held, e.g. in open-type syscalls context. Otherwise it can race with
+ * atomic_dec_and_test in deactivate_locked_super.
+ */
+void
+cifs_sb_active(struct super_block *sb)
+{
+       struct cifs_sb_info *server = CIFS_SB(sb);
+
+       if (atomic_inc_return(&server->active) == 1)
+               atomic_inc(&sb->s_active);
+}
+
+void
+cifs_sb_deactive(struct super_block *sb)
+{
+       struct cifs_sb_info *server = CIFS_SB(sb);
+
+       if (atomic_dec_and_test(&server->active))
+               deactivate_super(sb);
+}
+
 static int
 cifs_read_super(struct super_block *sb)
 {
@@ -777,6 +801,7 @@ struct file_system_type cifs_fs_type = {
        .kill_sb = cifs_kill_sb,
        /*  .fs_flags */
 };
+MODULE_ALIAS_FS("cifs");
 const struct inode_operations cifs_dir_inode_ops = {
        .create = cifs_create,
        .atomic_open = cifs_atomic_open,