[Aufs 20/25] aufs ioctl

J. R. Okajima
2009-03-09T03:37:12Z

currently for maintenance only

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
---
fs/aufs/ioctl.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 54 insertions(+), 0 deletions(-)
create mode 100644 fs/aufs/ioctl.c

diff --git a/fs/aufs/ioctl.c b/fs/aufs/ioctl.c
new file mode 100644
index 0000000..ff17d77
--- /dev/null
+++ b/fs/aufs/ioctl.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2005-2009 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.
+ */
+
+#include <linux/uaccess.h>
+#include "aufs.h"
+
+long aufs_ioctl_dir(struct file *file, unsigned int cmd,
+ unsigned long arg __maybe_unused)
+{
+ long err;
+ struct super_block *sb;
+ struct au_sbinfo *sbinfo;
+
+ err = -EACCES;
+ if (!capable(CAP_SYS_ADMIN))
+ goto out;
+
+ err = 0;
+ sb = file->f_dentry->d_sb;
+ sbinfo = au_sbi(sb);
+ switch (cmd) {
+ case AUFS_CTL_PLINK_MAINT:
+ /*
+ * pseudo-link maintenance mode,
+ * cleared by aufs_release_dir()
+ */
+ si_write_lock(sb);
+ if (!au_ftest_si(sbinfo, MAINTAIN_PLINK)) {
+ au_fset_si(sbinfo, MAINTAIN_PLINK);
+ au_fi(file)->fi_maintain_plink = 1;
+ } else
+ err = -EBUSY;
+ si_write_unlock(sb);
+ break;
+ case AUFS_CTL_PLINK_CLEAN:
+ if (au_opt_test(sbinfo->si_mntflags, PLINK)) {
+ aufs_write_lock(sb->s_root);
+ au_plink_put(sb);
+ aufs_write_unlock(sb->s_root);
+ }
+ break;
+ default:
+ err = -EINVAL;