fs/jfs/jfs_debug.c

   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
  20 static int jfs_loglevel_proc_show(struct seq_file *m, void *v)
  21 {
  22         seq_printf(m, "%d\n", jfsloglevel);
  23         return 0;
  24 }
  25
  26 static int jfs_loglevel_proc_open(struct inode *inode, struct file *file)
  27 {
  28         return single_open(file, jfs_loglevel_proc_show, NULL);
  29 }
  30
  31 static 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
  46 static const struct file_operations jfs_loglevel_proc_fops = {
  47         .open           = jfs_loglevel_proc_open,
  48         .read           = seq_read,
  49         .llseek         = seq_lseek,
  50         .release        = single_release,
  51         .write          = jfs_loglevel_proc_write,
  52 };
  53 #endif
  54
  55 void 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_fops);
  72 #endif
  73 }
  74
  75 void jfs_proc_clean(void)
  76 {
  77         remove_proc_subtree("fs/jfs", NULL);
  78 }
  79
  80 #endif /* PROC_FS_JFS */