LXR linux/fs/jfs/jfs

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *   Copyright (C) International Business Machines Corp., 2000-2004
   4 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   5 */
   6
   7#include <linux/fs.h>
   8#include <linux/ctype.h>
   9#include <linux/module.h>
  10#include <linux/proc_fs.h>
  11#include <linux/seq_file.h>
  12#include <linux/uaccess.h>
  13#include "jfs_incore.h"
  14#include "jfs_filsys.h"
  15#include "jfs_debug.h"
  16
  17#ifdef PROC_FS_JFS /* see jfs_debug.h */
  18
  19#ifdef CONFIG_JFS_DEBUG
  20static int jfs_loglevel_proc_show(struct seq_file *m, void *v)
  21{
  22        seq_printf(m, "%d\n", jfsloglevel);
  23        return 0;
  24}
  25
  26static int jfs_loglevel_proc_open(struct inode *inode, struct file *file)
  27{
  28        return single_open(file, jfs_loglevel_proc_show, NULL);
  29}
  30
  31static ssize_t jfs_loglevel_proc_write(struct file *file,
  32                const char __user *buffer, size_t count, loff_t *ppos)
  33{
  34        char c;
  35
  36        if (get_user(c, buffer))
  37                return -EFAULT;
  38
  39        /* yes, I know this is an ASCIIism.  --hch */
  40        if (c < '0' || c > '9')
  41                return -EINVAL;
  42        jfsloglevel = c - '0';
  43        return count;
  44}
  45
  46static const struct proc_ops jfs_loglevel_proc_ops = {
  47        .proc_open      = jfs_loglevel_proc_open,
  48        .proc_read      = seq_read,
  49        .proc_lseek     = seq_lseek,
  50        .proc_release   = single_release,
  51        .proc_write     = jfs_loglevel_proc_write,
  52};
  53#endif
  54
  55void jfs_proc_init(void)
  56{
  57        struct proc_dir_entry *base;
  58
  59        base = proc_mkdir("fs/jfs", NULL);
  60        if (!base)
  61                return;
  62
  63#ifdef CONFIG_JFS_STATISTICS
  64        proc_create_single("lmstats", 0, base, jfs_lmstats_proc_show);
  65        proc_create_single("txstats", 0, base, jfs_txstats_proc_show);
  66        proc_create_single("xtstat", 0, base, jfs_xtstat_proc_show);
  67        proc_create_single("mpstat", 0, base, jfs_mpstat_proc_show);
  68#endif
  69#ifdef CONFIG_JFS_DEBUG
  70        proc_create_single("TxAnchor", 0, base, jfs_txanchor_proc_show);
  71        proc_create("loglevel", 0, base, &jfs_loglevel_proc_ops);
  72#endif
  73}
  74
  75void jfs_proc_clean(void)
  76{
  77        remove_proc_subtree("fs/jfs", NULL);
  78}
  79
  80#endif /* PROC_FS_JFS */
  81