mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 15:13:55 +08:00
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>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/* FS-Cache statistics viewing interface
|
|
*
|
|
* 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 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 OPERATION
|
|
#include <linux/module.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
#include "internal.h"
|
|
|
|
/*
|
|
* initialise the /proc/fs/fscache/ directory
|
|
*/
|
|
int __init fscache_proc_init(void)
|
|
{
|
|
_enter("");
|
|
|
|
if (!proc_mkdir("fs/fscache", NULL))
|
|
goto error_dir;
|
|
|
|
#ifdef CONFIG_FSCACHE_STATS
|
|
if (!proc_create("fs/fscache/stats", S_IFREG | 0444, NULL,
|
|
&fscache_stats_fops))
|
|
goto error_stats;
|
|
#endif
|
|
|
|
#ifdef CONFIG_FSCACHE_HISTOGRAM
|
|
if (!proc_create("fs/fscache/histogram", S_IFREG | 0444, NULL,
|
|
&fscache_histogram_fops))
|
|
goto error_histogram;
|
|
#endif
|
|
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
#ifdef CONFIG_FSCACHE_HISTOGRAM
|
|
error_histogram:
|
|
#endif
|
|
#ifdef CONFIG_FSCACHE_STATS
|
|
remove_proc_entry("fs/fscache/stats", NULL);
|
|
error_stats:
|
|
#endif
|
|
remove_proc_entry("fs/fscache", NULL);
|
|
error_dir:
|
|
_leave(" = -ENOMEM");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* clean up the /proc/fs/fscache/ directory
|
|
*/
|
|
void fscache_proc_cleanup(void)
|
|
{
|
|
#ifdef CONFIG_FSCACHE_HISTOGRAM
|
|
remove_proc_entry("fs/fscache/histogram", NULL);
|
|
#endif
|
|
#ifdef CONFIG_FSCACHE_STATS
|
|
remove_proc_entry("fs/fscache/stats", NULL);
|
|
#endif
|
|
remove_proc_entry("fs/fscache", NULL);
|
|
}
|