Commit 52fd3d6f authored by Zach Brown's avatar Zach Brown Committed by Joel Becker
Browse files

[PATCH] OCFS2: The Second Oracle Cluster Filesystem



Very simple printk wrapper which adds the ability to enable various
sets of debug messages at run-time.
Signed-off-by: default avatarMark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: default avatarKurt Hackel <kurt.hackel@oracle.com>
parent 994fc28c
/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* Copyright (C) 2004, 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.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <asm/uaccess.h>
#include "masklog.h"
struct mlog_bits mlog_and_bits = MLOG_BITS_RHS(MLOG_INITIAL_AND_MASK);
EXPORT_SYMBOL_GPL(mlog_and_bits);
struct mlog_bits mlog_not_bits = MLOG_BITS_RHS(MLOG_INITIAL_NOT_MASK);
EXPORT_SYMBOL_GPL(mlog_not_bits);
static ssize_t mlog_mask_show(u64 mask, char *buf)
{
char *state;
if (__mlog_test_u64(mask, mlog_and_bits))
state = "allow";
else if (__mlog_test_u64(mask, mlog_not_bits))
state = "deny";
else
state = "off";
return snprintf(buf, PAGE_SIZE, "%s\n", state);
}
static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count)
{
if (!strnicmp(buf, "allow", 5)) {
__mlog_set_u64(mask, mlog_and_bits);
__mlog_clear_u64(mask, mlog_not_bits);
} else if (!strnicmp(buf, "deny", 4)) {
__mlog_set_u64(mask, mlog_not_bits);
__mlog_clear_u64(mask, mlog_and_bits);
} else if (!strnicmp(buf, "off", 3)) {
__mlog_clear_u64(mask, mlog_not_bits);
__mlog_clear_u64(mask, mlog_and_bits);
} else
return -EINVAL;
return count;
}
struct mlog_attribute {
struct attribute attr;
u64 mask;
};
#define to_mlog_attr(_attr) container_of(_attr, struct mlog_attribute, attr)
#define define_mask(_name) { \
.attr = { \
.name = #_name, \
.mode = S_IRUGO | S_IWUSR, \
}, \
.mask = ML_##_name, \
}
static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = {
define_mask(ENTRY),
define_mask(EXIT),
define_mask(TCP),
define_mask(MSG),
define_mask(SOCKET),
define_mask(HEARTBEAT),
define_mask(HB_BIO),
define_mask(DLMFS),
define_mask(DLM),
define_mask(DLM_DOMAIN),
define_mask(DLM_THREAD),
define_mask(DLM_MASTER),
define_mask(DLM_RECOVERY),
define_mask(AIO),
define_mask(JOURNAL),
define_mask(DISK_ALLOC),
define_mask(SUPER),
define_mask(FILE_IO),
define_mask(EXTENT_MAP),
define_mask(DLM_GLUE),
define_mask(BH_IO),
define_mask(UPTODATE),
define_mask(NAMEI),
define_mask(INODE),
define_mask(VOTE),
define_mask(DCACHE),
define_mask(CONN),
define_mask(QUORUM),
define_mask(EXPORT),
define_mask(ERROR),
define_mask(NOTICE),
define_mask(KTHREAD),
};
static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, };
static ssize_t mlog_show(struct kobject *obj, struct attribute *attr,
char *buf)
{
struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
return mlog_mask_show(mlog_attr->mask, buf);
}
static ssize_t mlog_store(struct kobject *obj, struct attribute *attr,
const char *buf, size_t count)
{
struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
return mlog_mask_store(mlog_attr->mask, buf, count);
}
static struct sysfs_ops mlog_attr_ops = {
.show = mlog_show,
.store = mlog_store,
};
static struct kobj_type mlog_ktype = {
.default_attrs = mlog_attr_ptrs,
.sysfs_ops = &mlog_attr_ops,
};
static struct kset mlog_kset = {
.kobj = {.name = "logmask", .ktype = &mlog_ktype},
};
int mlog_sys_init(struct subsystem *o2cb_subsys)
{
int i = 0;
while (mlog_attrs[i].attr.mode) {
mlog_attr_ptrs[i] = &mlog_attrs[i].attr;
i++;
}
mlog_attr_ptrs[i] = NULL;
mlog_kset.subsys = o2cb_subsys;
return kset_register(&mlog_kset);
}
void mlog_sys_shutdown(void)
{
kset_unregister(&mlog_kset);
}
/* -*- 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
#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 (__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)
#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 old compilers since they don't have support for
* __builtin_types_compatible_p.
*/
#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)) && \
!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)
#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)
#if (BITS_PER_LONG == 32) || defined(CONFIG_X86_64)
#define MLFi64 "lld"
#define MLFu64 "llu"
#define MLFx64 "llx"
#else
#define MLFi64 "ld"
#define MLFu64 "lu"
#define MLFx64 "lx"
#endif
#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 */
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