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7394daa8c6
Make FS-Cache create its /proc interface and present various statistical information through it. Also provide the functions for updating this information. These features are enabled by: CONFIG_FSCACHE_PROC CONFIG_FSCACHE_STATS CONFIG_FSCACHE_HISTOGRAM The /proc directory for FS-Cache is also exported so that caching modules can add their own statistics there too. The FS-Cache module is loadable at this point, and the statistics files can be examined by userspace: cat /proc/fs/fscache/stats cat /proc/fs/fscache/histogram 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>
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/* 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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ret = fscache_proc_init();
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if (ret < 0)
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goto error_proc;
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printk(KERN_NOTICE "FS-Cache: Loaded\n");
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return 0;
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error_proc:
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slow_work_unregister_user();
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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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fscache_proc_cleanup();
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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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