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Diffstat (limited to 'fs/ocfs2/cluster/masklog.h')
| -rw-r--r-- | fs/ocfs2/cluster/masklog.h | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/fs/ocfs2/cluster/masklog.h b/fs/ocfs2/cluster/masklog.h new file mode 100644 index 00000000000..e8c56a3d9c6 --- /dev/null +++ b/fs/ocfs2/cluster/masklog.h @@ -0,0 +1,274 @@ +/* -*- 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 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) + +#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 */ |