forked from Minki/linux
a18feb5576
Add some tracepoints to fscache:
(*) fscache_cookie - Tracks a cookie's usage count.
(*) fscache_netfs - Logs registration of a network filesystem, including
the pointer to the cookie allocated.
(*) fscache_acquire - Logs cookie acquisition.
(*) fscache_relinquish - Logs cookie relinquishment.
(*) fscache_enable - Logs enablement of a cookie.
(*) fscache_disable - Logs disablement of a cookie.
(*) fscache_osm - Tracks execution of states in the object state machine.
and cachefiles:
(*) cachefiles_ref - Tracks a cachefiles object's usage count.
(*) cachefiles_lookup - Logs result of lookup_one_len().
(*) cachefiles_mkdir - Logs result of vfs_mkdir().
(*) cachefiles_create - Logs result of vfs_create().
(*) cachefiles_unlink - Logs calls to vfs_unlink().
(*) cachefiles_rename - Logs calls to vfs_rename().
(*) cachefiles_mark_active - Logs an object becoming active.
(*) cachefiles_wait_active - Logs a wait for an old object to be
destroyed.
(*) cachefiles_mark_inactive - Logs an object becoming inactive.
(*) cachefiles_mark_buried - Logs the burial of an object.
Signed-off-by: David Howells <dhowells@redhat.com>
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
/* Network filesystem caching backend to use cache files on a premounted
|
|
* filesystem
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/file.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/statfs.h>
|
|
#include <linux/sysctl.h>
|
|
#include <linux/miscdevice.h>
|
|
#define CREATE_TRACE_POINTS
|
|
#include "internal.h"
|
|
|
|
unsigned cachefiles_debug;
|
|
module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
|
|
MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
|
|
|
|
MODULE_DESCRIPTION("Mounted-filesystem based cache");
|
|
MODULE_AUTHOR("Red Hat, Inc.");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
struct kmem_cache *cachefiles_object_jar;
|
|
|
|
static struct miscdevice cachefiles_dev = {
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
.name = "cachefiles",
|
|
.fops = &cachefiles_daemon_fops,
|
|
};
|
|
|
|
static void cachefiles_object_init_once(void *_object)
|
|
{
|
|
struct cachefiles_object *object = _object;
|
|
|
|
memset(object, 0, sizeof(*object));
|
|
spin_lock_init(&object->work_lock);
|
|
}
|
|
|
|
/*
|
|
* initialise the fs caching module
|
|
*/
|
|
static int __init cachefiles_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = misc_register(&cachefiles_dev);
|
|
if (ret < 0)
|
|
goto error_dev;
|
|
|
|
/* create an object jar */
|
|
ret = -ENOMEM;
|
|
cachefiles_object_jar =
|
|
kmem_cache_create("cachefiles_object_jar",
|
|
sizeof(struct cachefiles_object),
|
|
0,
|
|
SLAB_HWCACHE_ALIGN,
|
|
cachefiles_object_init_once);
|
|
if (!cachefiles_object_jar) {
|
|
pr_notice("Failed to allocate an object jar\n");
|
|
goto error_object_jar;
|
|
}
|
|
|
|
ret = cachefiles_proc_init();
|
|
if (ret < 0)
|
|
goto error_proc;
|
|
|
|
pr_info("Loaded\n");
|
|
return 0;
|
|
|
|
error_proc:
|
|
kmem_cache_destroy(cachefiles_object_jar);
|
|
error_object_jar:
|
|
misc_deregister(&cachefiles_dev);
|
|
error_dev:
|
|
pr_err("failed to register: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
fs_initcall(cachefiles_init);
|
|
|
|
/*
|
|
* clean up on module removal
|
|
*/
|
|
static void __exit cachefiles_exit(void)
|
|
{
|
|
pr_info("Unloading\n");
|
|
|
|
cachefiles_proc_cleanup();
|
|
kmem_cache_destroy(cachefiles_object_jar);
|
|
misc_deregister(&cachefiles_dev);
|
|
}
|
|
|
|
module_exit(cachefiles_exit);
|