Initial import

1 files changed, 225 insertions, 0 deletions

diff --git a/fs/aufs/debug.h b/fs/aufs/debug.h
new file mode 100644
index 000000000..de6c2a682
--- /dev/null
+++ b/fs/aufs/debug.h
@@ -0,0 +1,225 @@
+/*
+ * Copyright (C) 2005-2015 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/>.
+ */
+
+/*
+ * debug print functions
+ */
+
+#ifndef __AUFS_DEBUG_H__
+#define __AUFS_DEBUG_H__
+
+#ifdef __KERNEL__
+
+#include <linux/atomic.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/sysrq.h>
+
+#ifdef CONFIG_AUFS_DEBUG
+#define AuDebugOn(a)		BUG_ON(a)
+
+/* module parameter */
+extern atomic_t aufs_debug;
+static inline void au_debug_on(void)
+{
+	atomic_inc(&aufs_debug);
+}
+static inline void au_debug_off(void)
+{
+	atomic_dec_if_positive(&aufs_debug);
+}
+
+static inline int au_debug_test(void)
+{
+	return atomic_read(&aufs_debug) > 0;
+}
+#else
+#define AuDebugOn(a)		do {} while (0)
+AuStubVoid(au_debug_on, void)
+AuStubVoid(au_debug_off, void)
+AuStubInt0(au_debug_test, void)
+#endif /* CONFIG_AUFS_DEBUG */
+
+#define param_check_atomic_t(name, p) __param_check(name, p, atomic_t)
+
+/* ---------------------------------------------------------------------- */
+
+/* debug print */
+
+#define AuDbg(fmt, ...) do { \
+	if (au_debug_test()) \
+		pr_debug("DEBUG: " fmt, ##__VA_ARGS__); \
+} while (0)
+#define AuLabel(l)		AuDbg(#l "\n")
+#define AuIOErr(fmt, ...)	pr_err("I/O Error, " fmt, ##__VA_ARGS__)
+#define AuWarn1(fmt, ...) do { \
+	static unsigned char _c; \
+	if (!_c++) \
+		pr_warn(fmt, ##__VA_ARGS__); \
+} while (0)
+
+#define AuErr1(fmt, ...) do { \
+	static unsigned char _c; \
+	if (!_c++) \
+		pr_err(fmt, ##__VA_ARGS__); \
+} while (0)
+
+#define AuIOErr1(fmt, ...) do { \
+	static unsigned char _c; \
+	if (!_c++) \
+		AuIOErr(fmt, ##__VA_ARGS__); \
+} while (0)
+
+#define AuUnsupportMsg	"This operation is not supported." \
+			" Please report this application to aufs-users ML."
+#define AuUnsupport(fmt, ...) do { \
+	pr_err(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \
+	dump_stack(); \
+} while (0)
+
+#define AuTraceErr(e) do { \
+	if (unlikely((e) < 0)) \
+		AuDbg("err %d\n", (int)(e)); \
+} while (0)
+
+#define AuTraceErrPtr(p) do { \
+	if (IS_ERR(p)) \
+		AuDbg("err %ld\n", PTR_ERR(p)); \
+} while (0)
+
+/* dirty macros for debug print, use with "%.*s" and caution */
+#define AuLNPair(qstr)		(qstr)->len, (qstr)->name
+
+/* ---------------------------------------------------------------------- */
+
+struct dentry;
+#ifdef CONFIG_AUFS_DEBUG
+extern struct mutex au_dbg_mtx;
+extern char *au_plevel;
+struct au_nhash;
+void au_dpri_whlist(struct au_nhash *whlist);
+struct au_vdir;
+void au_dpri_vdir(struct au_vdir *vdir);
+struct inode;
+void au_dpri_inode(struct inode *inode);
+void au_dpri_dalias(struct inode *inode);
+void au_dpri_dentry(struct dentry *dentry);
+struct file;
+void au_dpri_file(struct file *filp);
+struct super_block;
+void au_dpri_sb(struct super_block *sb);
+
+#define au_dbg_verify_dinode(d) __au_dbg_verify_dinode(d, __func__, __LINE__)
+void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line);
+void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen);
+void au_dbg_verify_kthread(void);
+
+int __init au_debug_init(void);
+
+#define AuDbgWhlist(w) do { \
+	mutex_lock(&au_dbg_mtx); \
+	AuDbg(#w "\n"); \
+	au_dpri_whlist(w); \
+	mutex_unlock(&au_dbg_mtx); \
+} while (0)
+
+#define AuDbgVdir(v) do { \
+	mutex_lock(&au_dbg_mtx); \
+	AuDbg(#v "\n"); \
+	au_dpri_vdir(v); \
+	mutex_unlock(&au_dbg_mtx); \
+} while (0)
+
+#define AuDbgInode(i) do { \
+	mutex_lock(&au_dbg_mtx); \
+	AuDbg(#i "\n"); \
+	au_dpri_inode(i); \
+	mutex_unlock(&au_dbg_mtx); \
+} while (0)
+
+#define AuDbgDAlias(i) do { \
+	mutex_lock(&au_dbg_mtx); \
+	AuDbg(#i "\n"); \
+	au_dpri_dalias(i); \
+	mutex_unlock(&au_dbg_mtx); \
+} while (0)
+
+#define AuDbgDentry(d) do { \
+	mutex_lock(&au_dbg_mtx); \
+	AuDbg(#d "\n"); \
+	au_dpri_dentry(d); \
+	mutex_unlock(&au_dbg_mtx); \
+} while (0)
+
+#define AuDbgFile(f) do { \
+	mutex_lock(&au_dbg_mtx); \
+	AuDbg(#f "\n"); \
+	au_dpri_file(f); \
+	mutex_unlock(&au_dbg_mtx); \
+} while (0)
+
+#define AuDbgSb(sb) do { \
+	mutex_lock(&au_dbg_mtx); \
+	AuDbg(#sb "\n"); \
+	au_dpri_sb(sb); \
+	mutex_unlock(&au_dbg_mtx); \
+} while (0)
+
+#define AuDbgSym(addr) do {				\
+	char sym[KSYM_SYMBOL_LEN];			\
+	sprint_symbol(sym, (unsigned long)addr);	\
+	AuDbg("%s\n", sym);				\
+} while (0)
+#else
+AuStubVoid(au_dbg_verify_dinode, struct dentry *dentry)
+AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen)
+AuStubVoid(au_dbg_verify_kthread, void)
+AuStubInt0(__init au_debug_init, void)
+
+#define AuDbgWhlist(w)		do {} while (0)
+#define AuDbgVdir(v)		do {} while (0)
+#define AuDbgInode(i)		do {} while (0)
+#define AuDbgDAlias(i)		do {} while (0)
+#define AuDbgDentry(d)		do {} while (0)
+#define AuDbgFile(f)		do {} while (0)
+#define AuDbgSb(sb)		do {} while (0)
+#define AuDbgSym(addr)		do {} while (0)
+#endif /* CONFIG_AUFS_DEBUG */
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_MAGIC_SYSRQ
+int __init au_sysrq_init(void);
+void au_sysrq_fin(void);
+
+#ifdef CONFIG_HW_CONSOLE
+#define au_dbg_blocked() do { \
+	WARN_ON(1); \
+	handle_sysrq('w'); \
+} while (0)
+#else
+AuStubVoid(au_dbg_blocked, void)
+#endif
+
+#else
+AuStubInt0(__init au_sysrq_init, void)
+AuStubVoid(au_sysrq_fin, void)
+AuStubVoid(au_dbg_blocked, void)
+#endif /* CONFIG_AUFS_MAGIC_SYSRQ */
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DEBUG_H__ */