fs/jfs/jfs_debug.c

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2004
   3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/fs.h>
  21 #include <linux/ctype.h>
  22 #include <linux/module.h>
  23 #include <linux/proc_fs.h>
  24 #include <asm/uaccess.h>
  25 #include "jfs_incore.h"
  26 #include "jfs_filsys.h"
  27 #include "jfs_debug.h"
  28
  29 #ifdef PROC_FS_JFS /* see jfs_debug.h */
  30
  31 static struct proc_dir_entry *base;
  32 #ifdef CONFIG_JFS_DEBUG
  33 static int loglevel_read(char *page, char **start, off_t off,
  34                          int count, int *eof, void *data)
  35 {
  36         int len;
  37
  38         len = sprintf(page, "%d\n", jfsloglevel);
  39
  40         len -= off;
  41         *start = page + off;
  42
  43         if (len > count)
  44                 len = count;
  45         else
  46                 *eof = 1;
  47
  48         if (len < 0)
  49                 len = 0;
  50
  51         return len;
  52 }
  53
  54 static int loglevel_write(struct file *file, const char __user *buffer,
  55                         unsigned long count, void *data)
  56 {
  57         char c;
  58
  59         if (get_user(c, buffer))
  60                 return -EFAULT;
  61
  62         /* yes, I know this is an ASCIIism.  --hch */
  63         if (c < '0' || c > '9')
  64                 return -EINVAL;
  65         jfsloglevel = c - '0';
  66         return count;
  67 }
  68 #endif
  69
  70 static struct {
  71         const char      *name;
  72         read_proc_t     *read_fn;
  73         write_proc_t    *write_fn;
  74 } Entries[] = {
  75 #ifdef CONFIG_JFS_STATISTICS
  76         { "lmstats",    jfs_lmstats_read, },
  77         { "txstats",    jfs_txstats_read, },
  78         { "xtstat",     jfs_xtstat_read, },
  79         { "mpstat",     jfs_mpstat_read, },
  80 #endif
  81 #ifdef CONFIG_JFS_DEBUG
  82         { "TxAnchor",   jfs_txanchor_read, },
  83         { "loglevel",   loglevel_read, loglevel_write }
  84 #endif
  85 };
  86 #define NPROCENT        ARRAY_SIZE(Entries)
  87
  88 void jfs_proc_init(void)
  89 {
  90         int i;
  91
  92         if (!(base = proc_mkdir("jfs", proc_root_fs)))
  93                 return;
  94         base->owner = THIS_MODULE;
  95
  96         for (i = 0; i < NPROCENT; i++) {
  97                 struct proc_dir_entry *p;
  98                 if ((p = create_proc_entry(Entries[i].name, 0, base))) {
  99                         p->read_proc = Entries[i].read_fn;
 100                         p->write_proc = Entries[i].write_fn;
 101                 }
 102         }
 103 }
 104
 105 void jfs_proc_clean(void)
 106 {
 107         int i;
 108
 109         if (base) {
 110                 for (i = 0; i < NPROCENT; i++)
 111                         remove_proc_entry(Entries[i].name, base);
 112                 remove_proc_entry("jfs", proc_root_fs);
 113         }
 114 }
 115
 116 #endif /* PROC_FS_JFS */