mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-16 17:23:55 +08:00
40f2b6ffe5
Commit 8b8edefa
(fscache: convert object to use workqueue instead of
slow-work) made fscache_exit() call unregister_sysctl_table()
unconditionally breaking build when sysctl is disabled. Fix it by
putting it inside CONFIG_SYSCTL.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: David Howells <dhowells@redhat.com>
219 lines
5.2 KiB
C
219 lines
5.2 KiB
C
/* General filesystem local caching manager
|
|
*
|
|
* Copyright (C) 2004-2007 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 License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#define FSCACHE_DEBUG_LEVEL CACHE
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/seq_file.h>
|
|
#include "internal.h"
|
|
|
|
MODULE_DESCRIPTION("FS Cache Manager");
|
|
MODULE_AUTHOR("Red Hat, Inc.");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
unsigned fscache_defer_lookup = 1;
|
|
module_param_named(defer_lookup, fscache_defer_lookup, uint,
|
|
S_IWUSR | S_IRUGO);
|
|
MODULE_PARM_DESC(fscache_defer_lookup,
|
|
"Defer cookie lookup to background thread");
|
|
|
|
unsigned fscache_defer_create = 1;
|
|
module_param_named(defer_create, fscache_defer_create, uint,
|
|
S_IWUSR | S_IRUGO);
|
|
MODULE_PARM_DESC(fscache_defer_create,
|
|
"Defer cookie creation to background thread");
|
|
|
|
unsigned fscache_debug;
|
|
module_param_named(debug, fscache_debug, uint,
|
|
S_IWUSR | S_IRUGO);
|
|
MODULE_PARM_DESC(fscache_debug,
|
|
"FS-Cache debugging mask");
|
|
|
|
struct kobject *fscache_root;
|
|
struct workqueue_struct *fscache_object_wq;
|
|
struct workqueue_struct *fscache_op_wq;
|
|
|
|
DEFINE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);
|
|
|
|
/* these values serve as lower bounds, will be adjusted in fscache_init() */
|
|
static unsigned fscache_object_max_active = 4;
|
|
static unsigned fscache_op_max_active = 2;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
static struct ctl_table_header *fscache_sysctl_header;
|
|
|
|
static int fscache_max_active_sysctl(struct ctl_table *table, int write,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct workqueue_struct **wqp = table->extra1;
|
|
unsigned int *datap = table->data;
|
|
int ret;
|
|
|
|
ret = proc_dointvec(table, write, buffer, lenp, ppos);
|
|
if (ret == 0)
|
|
workqueue_set_max_active(*wqp, *datap);
|
|
return ret;
|
|
}
|
|
|
|
ctl_table fscache_sysctls[] = {
|
|
{
|
|
.procname = "object_max_active",
|
|
.data = &fscache_object_max_active,
|
|
.maxlen = sizeof(unsigned),
|
|
.mode = 0644,
|
|
.proc_handler = fscache_max_active_sysctl,
|
|
.extra1 = &fscache_object_wq,
|
|
},
|
|
{
|
|
.procname = "operation_max_active",
|
|
.data = &fscache_op_max_active,
|
|
.maxlen = sizeof(unsigned),
|
|
.mode = 0644,
|
|
.proc_handler = fscache_max_active_sysctl,
|
|
.extra1 = &fscache_op_wq,
|
|
},
|
|
{}
|
|
};
|
|
|
|
ctl_table fscache_sysctls_root[] = {
|
|
{
|
|
.procname = "fscache",
|
|
.mode = 0555,
|
|
.child = fscache_sysctls,
|
|
},
|
|
{}
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* initialise the fs caching module
|
|
*/
|
|
static int __init fscache_init(void)
|
|
{
|
|
unsigned int nr_cpus = num_possible_cpus();
|
|
unsigned int cpu;
|
|
int ret;
|
|
|
|
fscache_object_max_active =
|
|
clamp_val(nr_cpus,
|
|
fscache_object_max_active, WQ_UNBOUND_MAX_ACTIVE);
|
|
|
|
ret = -ENOMEM;
|
|
fscache_object_wq = alloc_workqueue("fscache_object", WQ_UNBOUND,
|
|
fscache_object_max_active);
|
|
if (!fscache_object_wq)
|
|
goto error_object_wq;
|
|
|
|
fscache_op_max_active =
|
|
clamp_val(fscache_object_max_active / 2,
|
|
fscache_op_max_active, WQ_UNBOUND_MAX_ACTIVE);
|
|
|
|
ret = -ENOMEM;
|
|
fscache_op_wq = alloc_workqueue("fscache_operation", WQ_UNBOUND,
|
|
fscache_op_max_active);
|
|
if (!fscache_op_wq)
|
|
goto error_op_wq;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
init_waitqueue_head(&per_cpu(fscache_object_cong_wait, cpu));
|
|
|
|
ret = fscache_proc_init();
|
|
if (ret < 0)
|
|
goto error_proc;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
ret = -ENOMEM;
|
|
fscache_sysctl_header = register_sysctl_table(fscache_sysctls_root);
|
|
if (!fscache_sysctl_header)
|
|
goto error_sysctl;
|
|
#endif
|
|
|
|
fscache_cookie_jar = kmem_cache_create("fscache_cookie_jar",
|
|
sizeof(struct fscache_cookie),
|
|
0,
|
|
0,
|
|
fscache_cookie_init_once);
|
|
if (!fscache_cookie_jar) {
|
|
printk(KERN_NOTICE
|
|
"FS-Cache: Failed to allocate a cookie jar\n");
|
|
ret = -ENOMEM;
|
|
goto error_cookie_jar;
|
|
}
|
|
|
|
fscache_root = kobject_create_and_add("fscache", kernel_kobj);
|
|
if (!fscache_root)
|
|
goto error_kobj;
|
|
|
|
printk(KERN_NOTICE "FS-Cache: Loaded\n");
|
|
return 0;
|
|
|
|
error_kobj:
|
|
kmem_cache_destroy(fscache_cookie_jar);
|
|
error_cookie_jar:
|
|
#ifdef CONFIG_SYSCTL
|
|
unregister_sysctl_table(fscache_sysctl_header);
|
|
error_sysctl:
|
|
#endif
|
|
fscache_proc_cleanup();
|
|
error_proc:
|
|
destroy_workqueue(fscache_op_wq);
|
|
error_op_wq:
|
|
destroy_workqueue(fscache_object_wq);
|
|
error_object_wq:
|
|
return ret;
|
|
}
|
|
|
|
fs_initcall(fscache_init);
|
|
|
|
/*
|
|
* clean up on module removal
|
|
*/
|
|
static void __exit fscache_exit(void)
|
|
{
|
|
_enter("");
|
|
|
|
kobject_put(fscache_root);
|
|
kmem_cache_destroy(fscache_cookie_jar);
|
|
#ifdef CONFIG_SYSCTL
|
|
unregister_sysctl_table(fscache_sysctl_header);
|
|
#endif
|
|
fscache_proc_cleanup();
|
|
destroy_workqueue(fscache_op_wq);
|
|
destroy_workqueue(fscache_object_wq);
|
|
printk(KERN_NOTICE "FS-Cache: Unloaded\n");
|
|
}
|
|
|
|
module_exit(fscache_exit);
|
|
|
|
/*
|
|
* wait_on_bit() sleep function for uninterruptible waiting
|
|
*/
|
|
int fscache_wait_bit(void *flags)
|
|
{
|
|
schedule();
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(fscache_wait_bit);
|
|
|
|
/*
|
|
* wait_on_bit() sleep function for interruptible waiting
|
|
*/
|
|
int fscache_wait_bit_interruptible(void *flags)
|
|
{
|
|
schedule();
|
|
return signal_pending(current);
|
|
}
|
|
EXPORT_SYMBOL(fscache_wait_bit_interruptible);
|