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 */ 117