forked from luck/tmp_suning_uos_patched
7c2bd2f930
Using a function for __mlog_printk instead of a macro reduces the object
size of built-in.o by about 190KB, or ~18% overall (x86-64 defconfig
with all ocfs2 options)
$ size fs/ocfs2/built-in.o*
text data bss dec hex filename
870954 118471 134408 1123833 1125f9 fs/ocfs2/built-in.o,new
1064081 118071 134408 1316560 1416d0 fs/ocfs2/built-in.o.old
Miscellanea:
- Move the used-once __mlog_cpu_guess statement expression macro to the
masklog.c file above the use in __mlog_printk function
- Simplify the mlog macro moving the and/or logic and level code into
__mlog_printk
[akpm@linux-foundation.org: export __mlog_printk() to other ocfs2 modules]
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
204 lines
7.2 KiB
C
204 lines
7.2 KiB
C
/* -*- 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 managed from the files under
|
|
* /sys/fs/o2cb/logmask/. Reading the files gives a straightforward
|
|
* indication of which bits are allowed (allow) or denied (off/deny).
|
|
* ENTRY deny
|
|
* EXIT deny
|
|
* TCP off
|
|
* MSG off
|
|
* SOCKET off
|
|
* ERROR allow
|
|
* NOTICE allow
|
|
*
|
|
* Writing changes the state of a given bit and requires a strictly formatted
|
|
* single write() call:
|
|
*
|
|
* write(fd, "allow", 5);
|
|
*
|
|
* Echoing allow/deny/off string into the logmask files can flip the bits
|
|
* on or off as expected; here is the bash script for example:
|
|
*
|
|
* log_mask="/sys/fs/o2cb/log_mask"
|
|
* for node in ENTRY EXIT TCP MSG SOCKET ERROR NOTICE; do
|
|
* echo allow >"$log_mask"/"$node"
|
|
* done
|
|
*
|
|
* The debugfs.ocfs2 tool can also flip the bits with the -l option:
|
|
*
|
|
* debugfs.ocfs2 -l TCP allow
|
|
*/
|
|
|
|
/* 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 masklog.c! */
|
|
#define ML_TCP 0x0000000000000001ULL /* net cluster/tcp.c */
|
|
#define ML_MSG 0x0000000000000002ULL /* net network messages */
|
|
#define ML_SOCKET 0x0000000000000004ULL /* net socket lifetime */
|
|
#define ML_HEARTBEAT 0x0000000000000008ULL /* hb all heartbeat tracking */
|
|
#define ML_HB_BIO 0x0000000000000010ULL /* hb io tracing */
|
|
#define ML_DLMFS 0x0000000000000020ULL /* dlm user dlmfs */
|
|
#define ML_DLM 0x0000000000000040ULL /* dlm general debugging */
|
|
#define ML_DLM_DOMAIN 0x0000000000000080ULL /* dlm domain debugging */
|
|
#define ML_DLM_THREAD 0x0000000000000100ULL /* dlm domain thread */
|
|
#define ML_DLM_MASTER 0x0000000000000200ULL /* dlm master functions */
|
|
#define ML_DLM_RECOVERY 0x0000000000000400ULL /* dlm master functions */
|
|
#define ML_DLM_GLUE 0x0000000000000800ULL /* ocfs2 dlm glue layer */
|
|
#define ML_VOTE 0x0000000000001000ULL /* ocfs2 node messaging */
|
|
#define ML_CONN 0x0000000000002000ULL /* net connection management */
|
|
#define ML_QUORUM 0x0000000000004000ULL /* net connection quorum */
|
|
#define ML_BASTS 0x0000000000008000ULL /* dlmglue asts and basts */
|
|
#define ML_CLUSTER 0x0000000000010000ULL /* cluster stack */
|
|
|
|
/* bits that are infrequently given and frequently matched in the high word */
|
|
#define ML_ERROR 0x1000000000000000ULL /* sent to KERN_ERR */
|
|
#define ML_NOTICE 0x2000000000000000ULL /* setn to KERN_NOTICE */
|
|
#define ML_KTHREAD 0x4000000000000000ULL /* kernel thread activity */
|
|
|
|
#define MLOG_INITIAL_AND_MASK (ML_ERROR|ML_NOTICE)
|
|
#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
|
|
|
|
__printf(4, 5)
|
|
void __mlog_printk(const u64 *m, const char *func, int line,
|
|
const char *fmt, ...);
|
|
|
|
/*
|
|
* Testing before the __mlog_printk call lets the compiler eliminate the
|
|
* call completely when (m & ML_ALLOWED_BITS) is 0.
|
|
*/
|
|
#define mlog(mask, fmt, ...) \
|
|
do { \
|
|
u64 _m = MLOG_MASK_PREFIX | (mask); \
|
|
if (_m & ML_ALLOWED_BITS) \
|
|
__mlog_printk(&_m, __func__, __LINE__, fmt, \
|
|
##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#define mlog_errno(st) ({ \
|
|
int _st = (st); \
|
|
if (_st != -ERESTARTSYS && _st != -EINTR && \
|
|
_st != AOP_TRUNCATED_PAGE && _st != -ENOSPC && \
|
|
_st != -EDQUOT) \
|
|
mlog(ML_ERROR, "status = %lld\n", (long long)_st); \
|
|
_st; \
|
|
})
|
|
|
|
#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 kset *o2cb_subsys);
|
|
void mlog_sys_shutdown(void);
|
|
|
|
#endif /* O2CLUSTER_MASKLOG_H */
|