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FS-Cache: Add main configuration option, module entry points and debugging
Add the main configuration option, allowing FS-Cache to be selected; the module entry and exit functions and the debugging stuff used by these patches. The two configuration options added are: CONFIG_FSCACHE CONFIG_FSCACHE_DEBUG The first enables the facility, and the second makes the debugging statements enableable through the "debug" module parameter. The value of this parameter is a bitmask as described in: Documentation/filesystems/caching/fscache.txt The module can be loaded at this point, but all it will do at this point in the patch series is to start up the slow work facility and shut it down again. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Steve Dickson <steved@redhat.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
This commit is contained in:
David Howells
parent
0dfc41d1ef
commit
06b3db1b9b
6 changed files with 277 additions and 0 deletions
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@ -66,6 +66,12 @@ config GENERIC_ACL
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bool
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select FS_POSIX_ACL
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menu "Caches"
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source "fs/fscache/Kconfig"
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endmenu
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if BLOCK
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menu "CD-ROM/DVD Filesystems"
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@ -63,6 +63,7 @@ obj-$(CONFIG_PROFILING) += dcookies.o
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obj-$(CONFIG_DLM) += dlm/
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# Do not add any filesystems before this line
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obj-$(CONFIG_FSCACHE) += fscache/
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obj-$(CONFIG_REISERFS_FS) += reiserfs/
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obj-$(CONFIG_EXT3_FS) += ext3/ # Before ext2 so root fs can be ext3
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obj-$(CONFIG_EXT2_FS) += ext2/
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22
fs/fscache/Kconfig
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22
fs/fscache/Kconfig
Normal file
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@ -0,0 +1,22 @@
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config FSCACHE
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tristate "General filesystem local caching manager"
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depends on EXPERIMENTAL
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select SLOW_WORK
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help
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This option enables a generic filesystem caching manager that can be
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used by various network and other filesystems to cache data locally.
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Different sorts of caches can be plugged in, depending on the
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resources available.
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See Documentation/filesystems/caching/fscache.txt for more information.
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config FSCACHE_DEBUG
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bool "Debug FS-Cache"
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depends on FSCACHE
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help
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This permits debugging to be dynamically enabled in the local caching
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management module. If this is set, the debugging output may be
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enabled by setting bits in /sys/modules/fscache/parameter/debug.
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See Documentation/filesystems/caching/fscache.txt for more information.
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8
fs/fscache/Makefile
Normal file
8
fs/fscache/Makefile
Normal file
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@ -0,0 +1,8 @@
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#
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# Makefile for general filesystem caching code
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#
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fscache-y := \
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main.o
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obj-$(CONFIG_FSCACHE) := fscache.o
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165
fs/fscache/internal.h
Normal file
165
fs/fscache/internal.h
Normal file
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@ -0,0 +1,165 @@
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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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75
fs/fscache/main.c
Normal file
75
fs/fscache/main.c
Normal file
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@ -0,0 +1,75 @@
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/* General filesystem local caching manager
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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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#define FSCACHE_DEBUG_LEVEL CACHE
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/completion.h>
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#include <linux/slab.h>
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#include "internal.h"
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MODULE_DESCRIPTION("FS Cache Manager");
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MODULE_AUTHOR("Red Hat, Inc.");
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MODULE_LICENSE("GPL");
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unsigned fscache_defer_lookup = 1;
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module_param_named(defer_lookup, fscache_defer_lookup, uint,
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S_IWUSR | S_IRUGO);
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MODULE_PARM_DESC(fscache_defer_lookup,
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"Defer cookie lookup to background thread");
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unsigned fscache_defer_create = 1;
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module_param_named(defer_create, fscache_defer_create, uint,
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S_IWUSR | S_IRUGO);
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MODULE_PARM_DESC(fscache_defer_create,
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"Defer cookie creation to background thread");
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unsigned fscache_debug;
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module_param_named(debug, fscache_debug, uint,
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S_IWUSR | S_IRUGO);
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MODULE_PARM_DESC(fscache_debug,
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"FS-Cache debugging mask");
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struct kobject *fscache_root;
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/*
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* initialise the fs caching module
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*/
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static int __init fscache_init(void)
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{
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int ret;
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ret = slow_work_register_user();
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if (ret < 0)
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goto error_slow_work;
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printk(KERN_NOTICE "FS-Cache: Loaded\n");
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return 0;
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error_slow_work:
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return ret;
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}
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fs_initcall(fscache_init);
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/*
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* clean up on module removal
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*/
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static void __exit fscache_exit(void)
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{
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_enter("");
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slow_work_unregister_user();
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printk(KERN_NOTICE "FS-Cache: Unloaded\n");
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}
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module_exit(fscache_exit);
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