fs/ocfs2/cluster/masklog.h - kernel/msm-4.9 - Gitiles

 /* -*- mode: c; c-basic-offset: 8; -*-
  * vim: noexpandtab sw=8 ts=8 sts=0:
  *
  * Copyright (C) 2005 Oracle.  All rights reserved.
  *
  * This program 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., 59 Temple Place - Suite 330,
  * Boston, MA 021110-1307, USA.
  */

 #ifndef O2CLUSTER_MASKLOG_H
 #define O2CLUSTER_MASKLOG_H

 /*
  * For now this is a trivial wrapper around printk() that gives the critical
  * ability to enable sets of debugging output at run-time.  In the future this
  * will almost certainly be redirected to relayfs so that it can pay a
  * substantially lower heisenberg tax.
  *
  * Callers associate the message with a bitmask and a global bitmask is
  * maintained with help from /proc.  If any of the bits match the message is
  * output.
  *
  * We must have efficient bit tests on i386 and it seems gcc still emits crazy
  * code for the 64bit compare.  It emits very good code for the dual unsigned
  * long tests, though, completely avoiding tests that can never pass if the
  * caller gives a constant bitmask that fills one of the longs with all 0s.  So
  * the desire is to have almost all of the calls decided on by comparing just
  * one of the longs.  This leads to having infrequently given bits that are
  * frequently matched in the high bits.
  *
  * _ERROR and _NOTICE are used for messages that always go to the console and
  * have appropriate KERN_ prefixes.  We wrap these in our function instead of
  * just calling printk() so that this can eventually make its way through
  * relayfs along with the debugging messages.  Everything else gets KERN_DEBUG.
  * The inline tests and macro dance give GCC the opportunity to quite cleverly
  * only emit the appropriage printk() when the caller passes in a constant
  * mask, as is almost always the case.
  *
  * All this bitmask nonsense is hidden from the /proc interface so that Joel
  * doesn't have an aneurism.  Reading the file gives a straight forward
  * indication of which bits are on or off:
  * 	ENTRY off
  * 	EXIT off
  * 	TCP off
  * 	MSG off
  * 	SOCKET off
  * 	ERROR off
  * 	NOTICE on
  *
  * Writing changes the state of a given bit and requires a strictly formatted
  * single write() call:
  *
  * 	write(fd, "ENTRY on", 8);
  *
  * would turn the entry bit on.  "1" is also accepted in the place of "on", and
  * "off" and "0" behave as expected.
  *
  * Some trivial shell can flip all the bits on or off:
  *
  * log_mask="/proc/fs/ocfs2_nodemanager/log_mask"
  * cat $log_mask | (
  * 	while read bit status; do
  * 		# $1 is "on" or "off", say
  * 		echo "$bit $1" > $log_mask
  * 	done
  * )
  */

 /* for task_struct */
 #include <linux/sched.h>

 /* bits that are frequently given and infrequently matched in the low word */
 /* NOTE: If you add a flag, you need to also update mlog.c! */
 #define ML_ENTRY	0x0000000000000001ULL /* func call entry */
 #define ML_EXIT		0x0000000000000002ULL /* func call exit */
 #define ML_TCP		0x0000000000000004ULL /* net cluster/tcp.c */
 #define ML_MSG		0x0000000000000008ULL /* net network messages */
 #define ML_SOCKET	0x0000000000000010ULL /* net socket lifetime */
 #define ML_HEARTBEAT	0x0000000000000020ULL /* hb all heartbeat tracking */
 #define ML_HB_BIO	0x0000000000000040ULL /* hb io tracing */
 #define ML_DLMFS	0x0000000000000080ULL /* dlm user dlmfs */
 #define ML_DLM		0x0000000000000100ULL /* dlm general debugging */
 #define ML_DLM_DOMAIN	0x0000000000000200ULL /* dlm domain debugging */
 #define ML_DLM_THREAD	0x0000000000000400ULL /* dlm domain thread */
 #define ML_DLM_MASTER	0x0000000000000800ULL /* dlm master functions */
 #define ML_DLM_RECOVERY	0x0000000000001000ULL /* dlm master functions */
 #define ML_AIO		0x0000000000002000ULL /* ocfs2 aio read and write */
 #define ML_JOURNAL	0x0000000000004000ULL /* ocfs2 journalling functions */
 #define ML_DISK_ALLOC	0x0000000000008000ULL /* ocfs2 disk allocation */
 #define ML_SUPER	0x0000000000010000ULL /* ocfs2 mount / umount */
 #define ML_FILE_IO	0x0000000000020000ULL /* ocfs2 file I/O */
 #define ML_EXTENT_MAP	0x0000000000040000ULL /* ocfs2 extent map caching */
 #define ML_DLM_GLUE	0x0000000000080000ULL /* ocfs2 dlm glue layer */
 #define ML_BH_IO	0x0000000000100000ULL /* ocfs2 buffer I/O */
 #define ML_UPTODATE	0x0000000000200000ULL /* ocfs2 caching sequence #'s */
 #define ML_NAMEI	0x0000000000400000ULL /* ocfs2 directory / namespace */
 #define ML_INODE	0x0000000000800000ULL /* ocfs2 inode manipulation */
 #define ML_VOTE		0x0000000001000000ULL /* ocfs2 node messaging  */
 #define ML_DCACHE	0x0000000002000000ULL /* ocfs2 dcache operations */
 #define ML_CONN		0x0000000004000000ULL /* net connection management */
 #define ML_QUORUM	0x0000000008000000ULL /* net connection quorum */
 #define ML_EXPORT	0x0000000010000000ULL /* ocfs2 export operations */
 /* bits that are infrequently given and frequently matched in the high word */
 #define ML_ERROR	0x0000000100000000ULL /* sent to KERN_ERR */
 #define ML_NOTICE	0x0000000200000000ULL /* setn to KERN_NOTICE */
 #define ML_KTHREAD	0x0000000400000000ULL /* kernel thread activity */

 #define MLOG_INITIAL_AND_MASK (ML_ERROR|ML_NOTICE)
 #define MLOG_INITIAL_NOT_MASK (ML_ENTRY|ML_EXIT)
 #ifndef MLOG_MASK_PREFIX
 #define MLOG_MASK_PREFIX 0
 #endif

 /*
  * When logging is disabled, force the bit test to 0 for anything other
  * than errors and notices, allowing gcc to remove the code completely.
  * When enabled, allow all masks.
  */
 #if defined(CONFIG_OCFS2_DEBUG_MASKLOG)
 #define ML_ALLOWED_BITS ~0
 #else
 #define ML_ALLOWED_BITS (ML_ERROR|ML_NOTICE)
 #endif

 #define MLOG_MAX_BITS 64

 struct mlog_bits {
 	unsigned long words[MLOG_MAX_BITS / BITS_PER_LONG];
 };

 extern struct mlog_bits mlog_and_bits, mlog_not_bits;

 #if BITS_PER_LONG == 32

 #define __mlog_test_u64(mask, bits)			\
 	( (u32)(mask & 0xffffffff) & bits.words[0] || 	\
 	  ((u64)(mask) >> 32) & bits.words[1] )
 #define __mlog_set_u64(mask, bits) do {			\
 	bits.words[0] |= (u32)(mask & 0xffffffff);	\
        	bits.words[1] |= (u64)(mask) >> 32;		\
 } while (0)
 #define __mlog_clear_u64(mask, bits) do {		\
 	bits.words[0] &= ~((u32)(mask & 0xffffffff));	\
        	bits.words[1] &= ~((u64)(mask) >> 32);		\
 } while (0)
 #define MLOG_BITS_RHS(mask) {				\
 	{						\
 		[0] = (u32)(mask & 0xffffffff),		\
 		[1] = (u64)(mask) >> 32,		\
 	}						\
 }

 #else /* 32bit long above, 64bit long below */

 #define __mlog_test_u64(mask, bits)	((mask) & bits.words[0])
 #define __mlog_set_u64(mask, bits) do {		\
 	bits.words[0] |= (mask);		\
 } while (0)
 #define __mlog_clear_u64(mask, bits) do {	\
 	bits.words[0] &= ~(mask);		\
 } while (0)
 #define MLOG_BITS_RHS(mask) { { (mask) } }

 #endif

 /*
  * smp_processor_id() "helpfully" screams when called outside preemptible
  * regions in current kernels.  sles doesn't have the variants that don't
  * scream.  just do this instead of trying to guess which we're building
  * against.. *sigh*.
  */
 #define __mlog_cpu_guess ({		\
 	unsigned long _cpu = get_cpu();	\
 	put_cpu();			\
 	_cpu;				\
 })

 /* In the following two macros, the whitespace after the ',' just
  * before ##args is intentional. Otherwise, gcc 2.95 will eat the
  * previous token if args expands to nothing.
  */
 #define __mlog_printk(level, fmt, args...)				\
 	printk(level "(%u,%lu):%s:%d " fmt, current->pid,		\
 	       __mlog_cpu_guess, __PRETTY_FUNCTION__, __LINE__ ,	\
 	       ##args)

 #define mlog(mask, fmt, args...) do {					\
 	u64 __m = MLOG_MASK_PREFIX | (mask);				\
 	if ((__m & ML_ALLOWED_BITS) &&					\
 	    __mlog_test_u64(__m, mlog_and_bits) &&			\
 	    !__mlog_test_u64(__m, mlog_not_bits)) {			\
 		if (__m & ML_ERROR)					\
 			__mlog_printk(KERN_ERR, "ERROR: "fmt , ##args);	\
 		else if (__m & ML_NOTICE)				\
 			__mlog_printk(KERN_NOTICE, fmt , ##args);	\
 		else __mlog_printk(KERN_INFO, fmt , ##args);		\
 	}								\
 } while (0)

 #define mlog_errno(st) do {						\
 	int _st = (st);							\
 	if (_st != -ERESTARTSYS && _st != -EINTR &&			\
 	    _st != AOP_TRUNCATED_PAGE)					\
 		mlog(ML_ERROR, "status = %lld\n", (long long)_st);	\
 } while (0)

 #if defined(CONFIG_OCFS2_DEBUG_MASKLOG)
 #define mlog_entry(fmt, args...) do {					\
 	mlog(ML_ENTRY, "ENTRY:" fmt , ##args);				\
 } while (0)

 #define mlog_entry_void() do {						\
 	mlog(ML_ENTRY, "ENTRY:\n");					\
 } while (0)

 /*
  * We disable this for sparse.
  */
 #if !defined(__CHECKER__)
 #define mlog_exit(st) do {						     \
 	if (__builtin_types_compatible_p(typeof(st), unsigned long))	     \
 		mlog(ML_EXIT, "EXIT: %lu\n", (unsigned long) (st));	     \
 	else if (__builtin_types_compatible_p(typeof(st), signed long))      \
 		mlog(ML_EXIT, "EXIT: %ld\n", (signed long) (st));	     \
 	else if (__builtin_types_compatible_p(typeof(st), unsigned int)	     \
 		 || __builtin_types_compatible_p(typeof(st), unsigned short) \
 		 || __builtin_types_compatible_p(typeof(st), unsigned char)) \
 		mlog(ML_EXIT, "EXIT: %u\n", (unsigned int) (st));	     \
 	else if (__builtin_types_compatible_p(typeof(st), signed int)	     \
 		 || __builtin_types_compatible_p(typeof(st), signed short)   \
 		 || __builtin_types_compatible_p(typeof(st), signed char))   \
 		mlog(ML_EXIT, "EXIT: %d\n", (signed int) (st));		     \
 	else if (__builtin_types_compatible_p(typeof(st), long long))	     \
 		mlog(ML_EXIT, "EXIT: %lld\n", (long long) (st));	     \
 	else								     \
 		mlog(ML_EXIT, "EXIT: %llu\n", (unsigned long long) (st));    \
 } while (0)
 #else
 #define mlog_exit(st) do {						     \
 	mlog(ML_EXIT, "EXIT: %lld\n", (long long) (st));		     \
 } while (0)
 #endif

 #define mlog_exit_ptr(ptr) do {						\
 	mlog(ML_EXIT, "EXIT: %p\n", ptr);				\
 } while (0)

 #define mlog_exit_void() do {						\
 	mlog(ML_EXIT, "EXIT\n");					\
 } while (0)
 #else
 #define mlog_entry(...)  do { } while (0)
 #define mlog_entry_void(...)  do { } while (0)
 #define mlog_exit(...)  do { } while (0)
 #define mlog_exit_ptr(...)  do { } while (0)
 #define mlog_exit_void(...)  do { } while (0)
 #endif  /* defined(CONFIG_OCFS2_DEBUG_MASKLOG) */

 #define mlog_bug_on_msg(cond, fmt, args...) do {			\
 	if (cond) {							\
 		mlog(ML_ERROR, "bug expression: " #cond "\n");		\
 		mlog(ML_ERROR, fmt, ##args);				\
 		BUG();							\
 	}								\
 } while (0)

 #include <linux/kobject.h>
 #include <linux/sysfs.h>
 int mlog_sys_init(struct subsystem *o2cb_subsys);
 void mlog_sys_shutdown(void);

 #endif /* O2CLUSTER_MASKLOG_H */
	/* -- mode: c; c-basic-offset: 8; --
	* vim: noexpandtab sw=8 ts=8 sts=0:
	*
	* Copyright (C) 2005 Oracle. All rights reserved.
	*
	* This program 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., 59 Temple Place - Suite 330,
	* Boston, MA 021110-1307, USA.
	*/

	#ifndef O2CLUSTER_MASKLOG_H
	#define O2CLUSTER_MASKLOG_H

	/*
	* For now this is a trivial wrapper around printk() that gives the critical
	* ability to enable sets of debugging output at run-time. In the future this
	* will almost certainly be redirected to relayfs so that it can pay a
	* substantially lower heisenberg tax.
	*
	* Callers associate the message with a bitmask and a global bitmask is
	* maintained with help from /proc. If any of the bits match the message is
	* output.
	*
	* We must have efficient bit tests on i386 and it seems gcc still emits crazy
	* code for the 64bit compare. It emits very good code for the dual unsigned
	* long tests, though, completely avoiding tests that can never pass if the
	* caller gives a constant bitmask that fills one of the longs with all 0s. So
	* the desire is to have almost all of the calls decided on by comparing just
	* one of the longs. This leads to having infrequently given bits that are
	* frequently matched in the high bits.
	*
	* _ERROR and _NOTICE are used for messages that always go to the console and
	* have appropriate KERN_ prefixes. We wrap these in our function instead of
	* just calling printk() so that this can eventually make its way through
	* relayfs along with the debugging messages. Everything else gets KERN_DEBUG.
	* The inline tests and macro dance give GCC the opportunity to quite cleverly
	* only emit the appropriage printk() when the caller passes in a constant
	* mask, as is almost always the case.
	*
	* All this bitmask nonsense is hidden from the /proc interface so that Joel
	* doesn't have an aneurism. Reading the file gives a straight forward
	* indication of which bits are on or off:
	* ENTRY off
	* EXIT off
	* TCP off
	* MSG off
	* SOCKET off
	* ERROR off
	* NOTICE on
	*
	* Writing changes the state of a given bit and requires a strictly formatted
	* single write() call:
	*
	* write(fd, "ENTRY on", 8);
	*
	* would turn the entry bit on. "1" is also accepted in the place of "on", and
	* "off" and "0" behave as expected.
	*
	* Some trivial shell can flip all the bits on or off:
	*
	* log_mask="/proc/fs/ocfs2_nodemanager/log_mask"
	* cat $log_mask \| (
	* while read bit status; do
	* # $1 is "on" or "off", say
	* echo "$bit $1" > $log_mask
	* done
	* )
	*/

	/* for task_struct */
	#include <linux/sched.h>

	/* bits that are frequently given and infrequently matched in the low word */
	/* NOTE: If you add a flag, you need to also update mlog.c! */
	#define ML_ENTRY 0x0000000000000001ULL /* func call entry */
	#define ML_EXIT 0x0000000000000002ULL /* func call exit */
	#define ML_TCP 0x0000000000000004ULL /* net cluster/tcp.c */
	#define ML_MSG 0x0000000000000008ULL /* net network messages */
	#define ML_SOCKET 0x0000000000000010ULL /* net socket lifetime */
	#define ML_HEARTBEAT 0x0000000000000020ULL /* hb all heartbeat tracking */
	#define ML_HB_BIO 0x0000000000000040ULL /* hb io tracing */
	#define ML_DLMFS 0x0000000000000080ULL /* dlm user dlmfs */
	#define ML_DLM 0x0000000000000100ULL /* dlm general debugging */
	#define ML_DLM_DOMAIN 0x0000000000000200ULL /* dlm domain debugging */
	#define ML_DLM_THREAD 0x0000000000000400ULL /* dlm domain thread */
	#define ML_DLM_MASTER 0x0000000000000800ULL /* dlm master functions */
	#define ML_DLM_RECOVERY 0x0000000000001000ULL /* dlm master functions */
	#define ML_AIO 0x0000000000002000ULL /* ocfs2 aio read and write */
	#define ML_JOURNAL 0x0000000000004000ULL /* ocfs2 journalling functions */
	#define ML_DISK_ALLOC 0x0000000000008000ULL /* ocfs2 disk allocation */
	#define ML_SUPER 0x0000000000010000ULL /* ocfs2 mount / umount */
	#define ML_FILE_IO 0x0000000000020000ULL /* ocfs2 file I/O */
	#define ML_EXTENT_MAP 0x0000000000040000ULL /* ocfs2 extent map caching */
	#define ML_DLM_GLUE 0x0000000000080000ULL /* ocfs2 dlm glue layer */
	#define ML_BH_IO 0x0000000000100000ULL /* ocfs2 buffer I/O */
	#define ML_UPTODATE 0x0000000000200000ULL /* ocfs2 caching sequence #'s */
	#define ML_NAMEI 0x0000000000400000ULL /* ocfs2 directory / namespace */
	#define ML_INODE 0x0000000000800000ULL /* ocfs2 inode manipulation */
	#define ML_VOTE 0x0000000001000000ULL /* ocfs2 node messaging */
	#define ML_DCACHE 0x0000000002000000ULL /* ocfs2 dcache operations */
	#define ML_CONN 0x0000000004000000ULL /* net connection management */
	#define ML_QUORUM 0x0000000008000000ULL /* net connection quorum */
	#define ML_EXPORT 0x0000000010000000ULL /* ocfs2 export operations */
	/* bits that are infrequently given and frequently matched in the high word */
	#define ML_ERROR 0x0000000100000000ULL /* sent to KERN_ERR */
	#define ML_NOTICE 0x0000000200000000ULL /* setn to KERN_NOTICE */
	#define ML_KTHREAD 0x0000000400000000ULL /* kernel thread activity */

	#define MLOG_INITIAL_AND_MASK (ML_ERROR\|ML_NOTICE)
	#define MLOG_INITIAL_NOT_MASK (ML_ENTRY\|ML_EXIT)
	#ifndef MLOG_MASK_PREFIX
	#define MLOG_MASK_PREFIX 0
	#endif

	/*
	* When logging is disabled, force the bit test to 0 for anything other
	* than errors and notices, allowing gcc to remove the code completely.
	* When enabled, allow all masks.
	*/
	#if defined(CONFIG_OCFS2_DEBUG_MASKLOG)
	#define ML_ALLOWED_BITS ~0
	#else
	#define ML_ALLOWED_BITS (ML_ERROR\|ML_NOTICE)
	#endif

	#define MLOG_MAX_BITS 64

	struct mlog_bits {
	unsigned long words[MLOG_MAX_BITS / BITS_PER_LONG];
	};

	extern struct mlog_bits mlog_and_bits, mlog_not_bits;

	#if BITS_PER_LONG == 32

	#define __mlog_test_u64(mask, bits) \
	( (u32)(mask & 0xffffffff) & bits.words[0] \|\| \
	((u64)(mask) >> 32) & bits.words[1] )
	#define __mlog_set_u64(mask, bits) do { \
	bits.words[0] \|= (u32)(mask & 0xffffffff); \
	bits.words[1] \|= (u64)(mask) >> 32; \
	} while (0)
	#define __mlog_clear_u64(mask, bits) do { \
	bits.words[0] &= ~((u32)(mask & 0xffffffff)); \
	bits.words[1] &= ~((u64)(mask) >> 32); \
	} while (0)
	#define MLOG_BITS_RHS(mask) { \
	{ \
	[0] = (u32)(mask & 0xffffffff), \
	[1] = (u64)(mask) >> 32, \
	} \
	}

	#else /* 32bit long above, 64bit long below */

	#define __mlog_test_u64(mask, bits) ((mask) & bits.words[0])
	#define __mlog_set_u64(mask, bits) do { \
	bits.words[0] \|= (mask); \
	} while (0)
	#define __mlog_clear_u64(mask, bits) do { \
	bits.words[0] &= ~(mask); \
	} while (0)
	#define MLOG_BITS_RHS(mask) { { (mask) } }

	#endif

	/*
	* smp_processor_id() "helpfully" screams when called outside preemptible
	* regions in current kernels. sles doesn't have the variants that don't
	* scream. just do this instead of trying to guess which we're building
	* against.. sigh.
	*/
	#define __mlog_cpu_guess ({ \
	unsigned long _cpu = get_cpu(); \
	put_cpu(); \
	_cpu; \
	})

	/* In the following two macros, the whitespace after the ',' just
	* before ##args is intentional. Otherwise, gcc 2.95 will eat the
	* previous token if args expands to nothing.
	*/
	#define __mlog_printk(level, fmt, args...) \
	printk(level "(%u,%lu):%s:%d " fmt, current->pid, \
	__mlog_cpu_guess, __PRETTY_FUNCTION__, __LINE__ , \
	##args)

	#define mlog(mask, fmt, args...) do { \
	u64 __m = MLOG_MASK_PREFIX \| (mask); \
	if ((__m & ML_ALLOWED_BITS) && \
	__mlog_test_u64(__m, mlog_and_bits) && \
	!__mlog_test_u64(__m, mlog_not_bits)) { \
	if (__m & ML_ERROR) \
	__mlog_printk(KERN_ERR, "ERROR: "fmt , ##args); \
	else if (__m & ML_NOTICE) \
	__mlog_printk(KERN_NOTICE, fmt , ##args); \
	else __mlog_printk(KERN_INFO, fmt , ##args); \
	} \
	} while (0)

	#define mlog_errno(st) do { \
	int _st = (st); \
	if (_st != -ERESTARTSYS && _st != -EINTR && \
	_st != AOP_TRUNCATED_PAGE) \
	mlog(ML_ERROR, "status = %lld\n", (long long)_st); \
	} while (0)

	#if defined(CONFIG_OCFS2_DEBUG_MASKLOG)
	#define mlog_entry(fmt, args...) do { \
	mlog(ML_ENTRY, "ENTRY:" fmt , ##args); \
	} while (0)

	#define mlog_entry_void() do { \
	mlog(ML_ENTRY, "ENTRY:\n"); \
	} while (0)

	/*
	* We disable this for sparse.
	*/
	#if !defined(__CHECKER__)
	#define mlog_exit(st) do { \
	if (__builtin_types_compatible_p(typeof(st), unsigned long)) \
	mlog(ML_EXIT, "EXIT: %lu\n", (unsigned long) (st)); \
	else if (__builtin_types_compatible_p(typeof(st), signed long)) \
	mlog(ML_EXIT, "EXIT: %ld\n", (signed long) (st)); \
	else if (__builtin_types_compatible_p(typeof(st), unsigned int) \
	\|\| __builtin_types_compatible_p(typeof(st), unsigned short) \
	\|\| __builtin_types_compatible_p(typeof(st), unsigned char)) \
	mlog(ML_EXIT, "EXIT: %u\n", (unsigned int) (st)); \
	else if (__builtin_types_compatible_p(typeof(st), signed int) \
	\|\| __builtin_types_compatible_p(typeof(st), signed short) \
	\|\| __builtin_types_compatible_p(typeof(st), signed char)) \
	mlog(ML_EXIT, "EXIT: %d\n", (signed int) (st)); \
	else if (__builtin_types_compatible_p(typeof(st), long long)) \
	mlog(ML_EXIT, "EXIT: %lld\n", (long long) (st)); \
	else \
	mlog(ML_EXIT, "EXIT: %llu\n", (unsigned long long) (st)); \
	} while (0)
	#else
	#define mlog_exit(st) do { \
	mlog(ML_EXIT, "EXIT: %lld\n", (long long) (st)); \
	} while (0)
	#endif

	#define mlog_exit_ptr(ptr) do { \
	mlog(ML_EXIT, "EXIT: %p\n", ptr); \
	} while (0)

	#define mlog_exit_void() do { \
	mlog(ML_EXIT, "EXIT\n"); \
	} while (0)
	#else
	#define mlog_entry(...) do { } while (0)
	#define mlog_entry_void(...) do { } while (0)
	#define mlog_exit(...) do { } while (0)
	#define mlog_exit_ptr(...) do { } while (0)
	#define mlog_exit_void(...) do { } while (0)
	#endif /* defined(CONFIG_OCFS2_DEBUG_MASKLOG) */

	#define mlog_bug_on_msg(cond, fmt, args...) do { \
	if (cond) { \
	mlog(ML_ERROR, "bug expression: " #cond "\n"); \
	mlog(ML_ERROR, fmt, ##args); \
	BUG(); \
	} \
	} while (0)

	#include <linux/kobject.h>
	#include <linux/sysfs.h>
	int mlog_sys_init(struct subsystem *o2cb_subsys);
	void mlog_sys_shutdown(void);

	#endif /* O2CLUSTER_MASKLOG_H */