[PATCH 62/67] aufs magic sysrq handler

[hooanon05]

From: Junjiro Okajima <hooanon05@xxxxxxxxxxx>

	initial commit
	aufs magic sysrq handler

Signed-off-by: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
---
 fs/aufs/sysrq.c |  112 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 112 insertions(+), 0 deletions(-)

diff --git a/fs/aufs/sysrq.c b/fs/aufs/sysrq.c
new file mode 100644
index 0000000..c50c885
--- /dev/null
+++ b/fs/aufs/sysrq.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2008 Junjiro 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/*
+ * magic sysrq hanlder
+ *
+ * $Id: sysrq.c,v 1.4 2008/05/04 23:53:27 sfjro Exp $
+ */
+
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/sysrq.h>
+#include "aufs.h"
+
+static void sysrq_sb(struct super_block *sb)
+{
+	char *plevel;
+	struct inode *i;
+
+	plevel = au_plevel;
+	au_plevel = KERN_WARNING;
+	au_debug_on();
+
+	pr_warning(AUFS_NAME ": superblock\n");
+	au_dpri_sb(sb);
+	pr_warning(AUFS_NAME ": root dentry\n");
+	au_dpri_dentry(sb->s_root);
+#if 0
+	pr_warning(AUFS_NAME ": root inode\n");
+	au_dpri_inode(sb->s_root->d_inode);
+#endif
+#if 1
+	pr_warning(AUFS_NAME ": isolated inode\n");
+	list_for_each_entry(i, &sb->s_inodes, i_sb_list)
+		if (list_empty(&i->i_dentry))
+			au_dpri_inode(i);
+#endif
+
+	au_plevel = plevel;
+	au_debug_off();
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* module parameter */
+static char *aufs_sysrq_key = "a";
+module_param_named(sysrq, aufs_sysrq_key, charp, S_IRUGO);
+MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME);
+
+static void au_sysrq(int key, struct tty_struct *tty)
+{
+	struct au_sbinfo *sbinfo;
+
+#if 0
+	if (au_debug_test())
+		au_debug_off();
+	else
+		au_debug_on();
+#endif
+
+	//mutex_lock(&au_sbilist_mtx);
+	list_for_each_entry(sbinfo, &au_sbilist, si_list)
+		sysrq_sb(sbinfo->si_sb);
+	//mutex_unlock(&au_sbilist_mtx);
+}
+
+static struct sysrq_key_op au_sysrq_op = {
+	.handler	= au_sysrq,
+	.help_msg	= "Aufs",
+	.action_msg	= "Aufs",
+	.enable_mask	= SYSRQ_ENABLE_DUMP //??
+};
+
+/* ---------------------------------------------------------------------- */
+
+int __init au_sysrq_init(void)
+{
+	int err;
+	char key;
+
+	err = -1;
+	key = *aufs_sysrq_key;
+	if ('a' <= key && key <= 'z')
+		err = register_sysrq_key(key, &au_sysrq_op);
+	if (unlikely(err))
+		AuErr("err %d, sysrq=%c\n", err, key);
+	return err;
+}
+
+void au_sysrq_fin(void)
+{
+	int err;
+	err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op);
+	if (unlikely(err))
+		AuErr("err %d (ignored)\n", err);
+}
-- 
1.4.4.4

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