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-rw-r--r--fs/aufs/hfsplus.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/fs/aufs/hfsplus.c b/fs/aufs/hfsplus.c
new file mode 100644
index 000000000..ced054639
--- /dev/null
+++ b/fs/aufs/hfsplus.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2010-2015 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * special support for filesystems which aqucires an inode mutex
+ * at final closing a file, eg, hfsplus.
+ *
+ * This trick is very simple and stupid, just to open the file before really
+ * neceeary open to tell hfsplus that this is not the final closing.
+ * The caller should call au_h_open_pre() after acquiring the inode mutex,
+ * and au_h_open_post() after releasing it.
+ */
+
+#include "aufs.h"
+
+struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex,
+ int force_wr)
+{
+ struct file *h_file;
+ struct dentry *h_dentry;
+
+ h_dentry = au_h_dptr(dentry, bindex);
+ AuDebugOn(!h_dentry);
+ AuDebugOn(d_is_negative(h_dentry));
+
+ h_file = NULL;
+ if (au_test_hfsplus(h_dentry->d_sb)
+ && d_is_reg(h_dentry))
+ h_file = au_h_open(dentry, bindex,
+ O_RDONLY | O_NOATIME | O_LARGEFILE,
+ /*file*/NULL, force_wr);
+ return h_file;
+}
+
+void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
+ struct file *h_file)
+{
+ if (h_file) {
+ fput(h_file);
+ au_sbr_put(dentry->d_sb, bindex);
+ }
+}