166 lines
4.3 KiB
C
166 lines
4.3 KiB
C
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/* Internal definitions for FS-Cache
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*
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* Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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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 License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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/*
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* Lock order, in the order in which multiple locks should be obtained:
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* - fscache_addremove_sem
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* - cookie->lock
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* - cookie->parent->lock
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* - cache->object_list_lock
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* - object->lock
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* - object->parent->lock
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* - fscache_thread_lock
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*
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*/
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#include <linux/fscache-cache.h>
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#include <linux/sched.h>
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#define FSCACHE_MIN_THREADS 4
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#define FSCACHE_MAX_THREADS 32
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/*
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* fsc-main.c
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*/
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extern unsigned fscache_defer_lookup;
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extern unsigned fscache_defer_create;
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extern unsigned fscache_debug;
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extern struct kobject *fscache_root;
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/*****************************************************************************/
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/*
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* debug tracing
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*/
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#define dbgprintk(FMT, ...) \
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printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
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/* make sure we maintain the format strings, even when debugging is disabled */
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static inline __attribute__((format(printf, 1, 2)))
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void _dbprintk(const char *fmt, ...)
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{
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}
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#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
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#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
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#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
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#define kjournal(FMT, ...) _dbprintk(FMT, ##__VA_ARGS__)
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#ifdef __KDEBUG
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#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
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#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
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#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
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#elif defined(CONFIG_FSCACHE_DEBUG)
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#define _enter(FMT, ...) \
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do { \
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if (__do_kdebug(ENTER)) \
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kenter(FMT, ##__VA_ARGS__); \
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} while (0)
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#define _leave(FMT, ...) \
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do { \
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if (__do_kdebug(LEAVE)) \
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kleave(FMT, ##__VA_ARGS__); \
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} while (0)
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#define _debug(FMT, ...) \
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do { \
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if (__do_kdebug(DEBUG)) \
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kdebug(FMT, ##__VA_ARGS__); \
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} while (0)
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#else
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#define _enter(FMT, ...) _dbprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
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#define _leave(FMT, ...) _dbprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
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#define _debug(FMT, ...) _dbprintk(FMT, ##__VA_ARGS__)
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#endif
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/*
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* determine whether a particular optional debugging point should be logged
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* - we need to go through three steps to persuade cpp to correctly join the
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* shorthand in FSCACHE_DEBUG_LEVEL with its prefix
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*/
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#define ____do_kdebug(LEVEL, POINT) \
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unlikely((fscache_debug & \
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(FSCACHE_POINT_##POINT << (FSCACHE_DEBUG_ ## LEVEL * 3))))
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#define ___do_kdebug(LEVEL, POINT) \
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____do_kdebug(LEVEL, POINT)
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#define __do_kdebug(POINT) \
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___do_kdebug(FSCACHE_DEBUG_LEVEL, POINT)
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#define FSCACHE_DEBUG_CACHE 0
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#define FSCACHE_DEBUG_COOKIE 1
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#define FSCACHE_DEBUG_PAGE 2
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#define FSCACHE_DEBUG_OPERATION 3
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#define FSCACHE_POINT_ENTER 1
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#define FSCACHE_POINT_LEAVE 2
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#define FSCACHE_POINT_DEBUG 4
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#ifndef FSCACHE_DEBUG_LEVEL
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#define FSCACHE_DEBUG_LEVEL CACHE
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#endif
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/*
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* assertions
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*/
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#if 1 /* defined(__KDEBUGALL) */
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#define ASSERT(X) \
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do { \
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if (unlikely(!(X))) { \
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printk(KERN_ERR "\n"); \
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printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
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BUG(); \
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} \
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} while (0)
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#define ASSERTCMP(X, OP, Y) \
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do { \
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if (unlikely(!((X) OP (Y)))) { \
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printk(KERN_ERR "\n"); \
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printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
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printk(KERN_ERR "%lx " #OP " %lx is false\n", \
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(unsigned long)(X), (unsigned long)(Y)); \
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BUG(); \
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} \
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} while (0)
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#define ASSERTIF(C, X) \
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do { \
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if (unlikely((C) && !(X))) { \
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printk(KERN_ERR "\n"); \
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printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
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BUG(); \
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} \
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} while (0)
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#define ASSERTIFCMP(C, X, OP, Y) \
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do { \
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if (unlikely((C) && !((X) OP (Y)))) { \
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printk(KERN_ERR "\n"); \
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printk(KERN_ERR "FS-Cache: Assertion failed\n"); \
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printk(KERN_ERR "%lx " #OP " %lx is false\n", \
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(unsigned long)(X), (unsigned long)(Y)); \
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BUG(); \
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} \
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} while (0)
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#else
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#define ASSERT(X) do {} while (0)
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#define ASSERTCMP(X, OP, Y) do {} while (0)
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#define ASSERTIF(C, X) do {} while (0)
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#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
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#endif /* assert or not */
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