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/*
* 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__ */
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