275 lines
10 KiB
C
275 lines
10 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* Copyright (C) 2005 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef O2CLUSTER_MASKLOG_H
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#define O2CLUSTER_MASKLOG_H
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/*
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* For now this is a trivial wrapper around printk() that gives the critical
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* ability to enable sets of debugging output at run-time. In the future this
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* will almost certainly be redirected to relayfs so that it can pay a
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* substantially lower heisenberg tax.
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*
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* Callers associate the message with a bitmask and a global bitmask is
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* maintained with help from /proc. If any of the bits match the message is
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* output.
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*
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* We must have efficient bit tests on i386 and it seems gcc still emits crazy
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* code for the 64bit compare. It emits very good code for the dual unsigned
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* long tests, though, completely avoiding tests that can never pass if the
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* caller gives a constant bitmask that fills one of the longs with all 0s. So
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* the desire is to have almost all of the calls decided on by comparing just
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* one of the longs. This leads to having infrequently given bits that are
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* frequently matched in the high bits.
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*
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* _ERROR and _NOTICE are used for messages that always go to the console and
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* have appropriate KERN_ prefixes. We wrap these in our function instead of
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* just calling printk() so that this can eventually make its way through
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* relayfs along with the debugging messages. Everything else gets KERN_DEBUG.
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* The inline tests and macro dance give GCC the opportunity to quite cleverly
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* only emit the appropriage printk() when the caller passes in a constant
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* mask, as is almost always the case.
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*
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* All this bitmask nonsense is hidden from the /proc interface so that Joel
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* doesn't have an aneurism. Reading the file gives a straight forward
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* indication of which bits are on or off:
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* ENTRY off
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* EXIT off
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* TCP off
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* MSG off
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* SOCKET off
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* ERROR off
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* NOTICE on
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*
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* Writing changes the state of a given bit and requires a strictly formatted
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* single write() call:
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*
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* write(fd, "ENTRY on", 8);
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*
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* would turn the entry bit on. "1" is also accepted in the place of "on", and
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* "off" and "0" behave as expected.
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*
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* Some trivial shell can flip all the bits on or off:
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*
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* log_mask="/proc/fs/ocfs2_nodemanager/log_mask"
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* cat $log_mask | (
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* while read bit status; do
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* # $1 is "on" or "off", say
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* echo "$bit $1" > $log_mask
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* done
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* )
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*/
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/* for task_struct */
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#include <linux/sched.h>
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/* bits that are frequently given and infrequently matched in the low word */
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/* NOTE: If you add a flag, you need to also update mlog.c! */
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#define ML_ENTRY 0x0000000000000001ULL /* func call entry */
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#define ML_EXIT 0x0000000000000002ULL /* func call exit */
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#define ML_TCP 0x0000000000000004ULL /* net cluster/tcp.c */
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#define ML_MSG 0x0000000000000008ULL /* net network messages */
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#define ML_SOCKET 0x0000000000000010ULL /* net socket lifetime */
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#define ML_HEARTBEAT 0x0000000000000020ULL /* hb all heartbeat tracking */
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#define ML_HB_BIO 0x0000000000000040ULL /* hb io tracing */
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#define ML_DLMFS 0x0000000000000080ULL /* dlm user dlmfs */
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#define ML_DLM 0x0000000000000100ULL /* dlm general debugging */
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#define ML_DLM_DOMAIN 0x0000000000000200ULL /* dlm domain debugging */
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#define ML_DLM_THREAD 0x0000000000000400ULL /* dlm domain thread */
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#define ML_DLM_MASTER 0x0000000000000800ULL /* dlm master functions */
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#define ML_DLM_RECOVERY 0x0000000000001000ULL /* dlm master functions */
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#define ML_AIO 0x0000000000002000ULL /* ocfs2 aio read and write */
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#define ML_JOURNAL 0x0000000000004000ULL /* ocfs2 journalling functions */
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#define ML_DISK_ALLOC 0x0000000000008000ULL /* ocfs2 disk allocation */
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#define ML_SUPER 0x0000000000010000ULL /* ocfs2 mount / umount */
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#define ML_FILE_IO 0x0000000000020000ULL /* ocfs2 file I/O */
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#define ML_EXTENT_MAP 0x0000000000040000ULL /* ocfs2 extent map caching */
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#define ML_DLM_GLUE 0x0000000000080000ULL /* ocfs2 dlm glue layer */
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#define ML_BH_IO 0x0000000000100000ULL /* ocfs2 buffer I/O */
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#define ML_UPTODATE 0x0000000000200000ULL /* ocfs2 caching sequence #'s */
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#define ML_NAMEI 0x0000000000400000ULL /* ocfs2 directory / namespace */
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#define ML_INODE 0x0000000000800000ULL /* ocfs2 inode manipulation */
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#define ML_VOTE 0x0000000001000000ULL /* ocfs2 node messaging */
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#define ML_DCACHE 0x0000000002000000ULL /* ocfs2 dcache operations */
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#define ML_CONN 0x0000000004000000ULL /* net connection management */
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#define ML_QUORUM 0x0000000008000000ULL /* net connection quorum */
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#define ML_EXPORT 0x0000000010000000ULL /* ocfs2 export operations */
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/* bits that are infrequently given and frequently matched in the high word */
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#define ML_ERROR 0x0000000100000000ULL /* sent to KERN_ERR */
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#define ML_NOTICE 0x0000000200000000ULL /* setn to KERN_NOTICE */
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#define ML_KTHREAD 0x0000000400000000ULL /* kernel thread activity */
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#define MLOG_INITIAL_AND_MASK (ML_ERROR|ML_NOTICE)
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#define MLOG_INITIAL_NOT_MASK (ML_ENTRY|ML_EXIT)
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#ifndef MLOG_MASK_PREFIX
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#define MLOG_MASK_PREFIX 0
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#endif
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#define MLOG_MAX_BITS 64
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struct mlog_bits {
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unsigned long words[MLOG_MAX_BITS / BITS_PER_LONG];
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};
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extern struct mlog_bits mlog_and_bits, mlog_not_bits;
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#if BITS_PER_LONG == 32
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#define __mlog_test_u64(mask, bits) \
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( (u32)(mask & 0xffffffff) & bits.words[0] || \
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((u64)(mask) >> 32) & bits.words[1] )
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#define __mlog_set_u64(mask, bits) do { \
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bits.words[0] |= (u32)(mask & 0xffffffff); \
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bits.words[1] |= (u64)(mask) >> 32; \
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} while (0)
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#define __mlog_clear_u64(mask, bits) do { \
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bits.words[0] &= ~((u32)(mask & 0xffffffff)); \
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bits.words[1] &= ~((u64)(mask) >> 32); \
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} while (0)
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#define MLOG_BITS_RHS(mask) { \
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{ \
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[0] = (u32)(mask & 0xffffffff), \
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[1] = (u64)(mask) >> 32, \
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} \
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}
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#else /* 32bit long above, 64bit long below */
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#define __mlog_test_u64(mask, bits) ((mask) & bits.words[0])
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#define __mlog_set_u64(mask, bits) do { \
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bits.words[0] |= (mask); \
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} while (0)
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#define __mlog_clear_u64(mask, bits) do { \
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bits.words[0] &= ~(mask); \
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} while (0)
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#define MLOG_BITS_RHS(mask) { { (mask) } }
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#endif
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/*
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* smp_processor_id() "helpfully" screams when called outside preemptible
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* regions in current kernels. sles doesn't have the variants that don't
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* scream. just do this instead of trying to guess which we're building
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* against.. *sigh*.
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*/
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#define __mlog_cpu_guess ({ \
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unsigned long _cpu = get_cpu(); \
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put_cpu(); \
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_cpu; \
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})
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/* In the following two macros, the whitespace after the ',' just
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* before ##args is intentional. Otherwise, gcc 2.95 will eat the
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* previous token if args expands to nothing.
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*/
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#define __mlog_printk(level, fmt, args...) \
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printk(level "(%u,%lu):%s:%d " fmt, current->pid, \
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__mlog_cpu_guess, __PRETTY_FUNCTION__, __LINE__ , \
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##args)
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#define mlog(mask, fmt, args...) do { \
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u64 __m = MLOG_MASK_PREFIX | (mask); \
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if (__mlog_test_u64(__m, mlog_and_bits) && \
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!__mlog_test_u64(__m, mlog_not_bits)) { \
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if (__m & ML_ERROR) \
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__mlog_printk(KERN_ERR, "ERROR: "fmt , ##args); \
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else if (__m & ML_NOTICE) \
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__mlog_printk(KERN_NOTICE, fmt , ##args); \
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else __mlog_printk(KERN_INFO, fmt , ##args); \
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} \
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} while (0)
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#define mlog_errno(st) do { \
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int _st = (st); \
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if (_st != -ERESTARTSYS && _st != -EINTR && \
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_st != AOP_TRUNCATED_PAGE) \
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mlog(ML_ERROR, "status = %lld\n", (long long)_st); \
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} while (0)
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#define mlog_entry(fmt, args...) do { \
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mlog(ML_ENTRY, "ENTRY:" fmt , ##args); \
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} while (0)
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#define mlog_entry_void() do { \
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mlog(ML_ENTRY, "ENTRY:\n"); \
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} while (0)
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/*
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* We disable this for sparse.
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*/
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#if !defined(__CHECKER__)
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#define mlog_exit(st) do { \
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if (__builtin_types_compatible_p(typeof(st), unsigned long)) \
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mlog(ML_EXIT, "EXIT: %lu\n", (unsigned long) (st)); \
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else if (__builtin_types_compatible_p(typeof(st), signed long)) \
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mlog(ML_EXIT, "EXIT: %ld\n", (signed long) (st)); \
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else if (__builtin_types_compatible_p(typeof(st), unsigned int) \
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|| __builtin_types_compatible_p(typeof(st), unsigned short) \
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|| __builtin_types_compatible_p(typeof(st), unsigned char)) \
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mlog(ML_EXIT, "EXIT: %u\n", (unsigned int) (st)); \
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else if (__builtin_types_compatible_p(typeof(st), signed int) \
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|| __builtin_types_compatible_p(typeof(st), signed short) \
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|| __builtin_types_compatible_p(typeof(st), signed char)) \
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mlog(ML_EXIT, "EXIT: %d\n", (signed int) (st)); \
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else if (__builtin_types_compatible_p(typeof(st), long long)) \
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mlog(ML_EXIT, "EXIT: %lld\n", (long long) (st)); \
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else \
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mlog(ML_EXIT, "EXIT: %llu\n", (unsigned long long) (st)); \
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} while (0)
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#else
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#define mlog_exit(st) do { \
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mlog(ML_EXIT, "EXIT: %lld\n", (long long) (st)); \
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} while (0)
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#endif
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#define mlog_exit_ptr(ptr) do { \
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mlog(ML_EXIT, "EXIT: %p\n", ptr); \
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} while (0)
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#define mlog_exit_void() do { \
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mlog(ML_EXIT, "EXIT\n"); \
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} while (0)
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#define mlog_bug_on_msg(cond, fmt, args...) do { \
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if (cond) { \
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mlog(ML_ERROR, "bug expression: " #cond "\n"); \
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mlog(ML_ERROR, fmt, ##args); \
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BUG(); \
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} \
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} while (0)
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#if (BITS_PER_LONG == 32) || defined(CONFIG_X86_64)
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#define MLFi64 "lld"
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#define MLFu64 "llu"
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#define MLFx64 "llx"
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#else
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#define MLFi64 "ld"
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#define MLFu64 "lu"
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#define MLFx64 "lx"
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#endif
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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int mlog_sys_init(struct subsystem *o2cb_subsys);
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void mlog_sys_shutdown(void);
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#endif /* O2CLUSTER_MASKLOG_H */
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