fs/coda/sysctl.c

   1 /*
   2  * Sysctl operations for Coda filesystem
   3  * Original version: (C) 1996 P. Braam and M. Callahan
   4  * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
   5  *
   6  * Carnegie Mellon encourages users to contribute improvements to
   7  * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
   8  *
   9  * CODA operation statistics
  10  * (c) March, 1998 Zhanyong Wan <zhanyong.wan@yale.edu>
  11  *
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/time.h>
  16 #include <linux/mm.h>
  17 #include <linux/sysctl.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/slab.h>
  20 #include <linux/stat.h>
  21 #include <linux/ctype.h>
  22 #include <asm/bitops.h>
  23 #include <asm/uaccess.h>
  24 #include <linux/utsname.h>
  25 #include <linux/module.h>
  26
  27 #include <linux/coda.h>
  28 #include <linux/coda_linux.h>
  29 #include <linux/coda_fs_i.h>
  30 #include <linux/coda_psdev.h>
  31 #include <linux/coda_cache.h>
  32 #include <linux/coda_proc.h>
  33
  34 static struct ctl_table_header *fs_table_header;
  35
  36 #define FS_CODA         1       /* Coda file system */
  37
  38 #define CODA_TIMEOUT    3       /* timeout on upcalls to become intrble */
  39 #define CODA_HARD       5       /* mount type "hard" or "soft" */
  40 #define CODA_VFS         6       /* vfs statistics */
  41 #define CODA_CACHE_INV   9       /* cache invalidation statistics */
  42 #define CODA_FAKE_STATFS 10      /* don't query venus for actual cache usage */
  43
  44 static ctl_table coda_table[] = {
  45         {CODA_TIMEOUT, "timeout", &coda_timeout, sizeof(int), 0644, NULL, &proc_dointvec},
  46         {CODA_HARD, "hard", &coda_hard, sizeof(int), 0644, NULL, &proc_dointvec},
  47         {CODA_VFS, "vfs_stats", NULL, 0, 0644, NULL, &do_reset_coda_vfs_stats},
  48         {CODA_CACHE_INV, "cache_inv_stats", NULL, 0, 0644, NULL, &do_reset_coda_cache_inv_stats},
  49         {CODA_FAKE_STATFS, "fake_statfs", &coda_fake_statfs, sizeof(int), 0600, NULL, &proc_dointvec},
  50         { 0 }
  51 };
  52
  53 static ctl_table fs_table[] = {
  54        {FS_CODA, "coda",    NULL, 0, 0555, coda_table},
  55        {0}
  56 };
  57
  58 struct coda_vfs_stats           coda_vfs_stat;
  59 struct coda_cache_inv_stats     coda_cache_inv_stat;
  60
  61 void reset_coda_vfs_stats( void )
  62 {
  63         memset( &coda_vfs_stat, 0, sizeof( coda_vfs_stat ) );
  64 }
  65
  66 void reset_coda_cache_inv_stats( void )
  67 {
  68         memset( &coda_cache_inv_stat, 0, sizeof( coda_cache_inv_stat ) );
  69 }
  70
  71 int do_reset_coda_vfs_stats( ctl_table * table, int write, struct file * filp,
  72                              void __user * buffer, size_t * lenp )
  73 {
  74         if ( write ) {
  75                 reset_coda_vfs_stats();
  76
  77                 filp->f_pos += *lenp;
  78         } else {
  79                 *lenp = 0;
  80         }
  81
  82         return 0;
  83 }
  84
  85 int do_reset_coda_cache_inv_stats( ctl_table * table, int write,
  86                                    struct file * filp, void __user * buffer,
  87                                    size_t * lenp )
  88 {
  89         if ( write ) {
  90                 reset_coda_cache_inv_stats();
  91
  92                 filp->f_pos += *lenp;
  93         } else {
  94                 *lenp = 0;
  95         }
  96
  97         return 0;
  98 }
  99
 100 int coda_vfs_stats_get_info( char * buffer, char ** start, off_t offset,
 101                              int length)
 102 {
 103         int len=0;
 104         off_t begin;
 105         struct coda_vfs_stats * ps = & coda_vfs_stat;
 106
 107   /* this works as long as we are below 1024 characters! */
 108         len += sprintf( buffer,
 109                         "Coda VFS statistics\n"
 110                         "===================\n\n"
 111                         "File Operations:\n"
 112                         "\topen\t\t%9d\n"
 113                         "\tflush\t\t%9d\n"
 114                         "\trelease\t\t%9d\n"
 115                         "\tfsync\t\t%9d\n\n"
 116                         "Dir Operations:\n"
 117                         "\treaddir\t\t%9d\n\n"
 118                         "Inode Operations\n"
 119                         "\tcreate\t\t%9d\n"
 120                         "\tlookup\t\t%9d\n"
 121                         "\tlink\t\t%9d\n"
 122                         "\tunlink\t\t%9d\n"
 123                         "\tsymlink\t\t%9d\n"
 124                         "\tmkdir\t\t%9d\n"
 125                         "\trmdir\t\t%9d\n"
 126                         "\trename\t\t%9d\n"
 127                         "\tpermission\t%9d\n",
 128
 129                         /* file operations */
 130                         ps->open,
 131                         ps->flush,
 132                         ps->release,
 133                         ps->fsync,
 134
 135                         /* dir operations */
 136                         ps->readdir,
 137
 138                         /* inode operations */
 139                         ps->create,
 140                         ps->lookup,
 141                         ps->link,
 142                         ps->unlink,
 143                         ps->symlink,
 144                         ps->mkdir,
 145                         ps->rmdir,
 146                         ps->rename,
 147                         ps->permission);
 148
 149         begin = offset;
 150         *start = buffer + begin;
 151         len -= begin;
 152
 153         if ( len > length )
 154                 len = length;
 155         if ( len < 0 )
 156                 len = 0;
 157
 158         return len;
 159 }
 160
 161 int coda_cache_inv_stats_get_info( char * buffer, char ** start, off_t offset,
 162                                    int length)
 163 {
 164         int len=0;
 165         off_t begin;
 166         struct coda_cache_inv_stats * ps = & coda_cache_inv_stat;
 167
 168         /* this works as long as we are below 1024 characters! */
 169         len += sprintf( buffer,
 170                         "Coda cache invalidation statistics\n"
 171                         "==================================\n\n"
 172                         "flush\t\t%9d\n"
 173                         "purge user\t%9d\n"
 174                         "zap_dir\t\t%9d\n"
 175                         "zap_file\t%9d\n"
 176                         "zap_vnode\t%9d\n"
 177                         "purge_fid\t%9d\n"
 178                         "replace\t\t%9d\n",
 179                         ps->flush,
 180                         ps->purge_user,
 181                         ps->zap_dir,
 182                         ps->zap_file,
 183                         ps->zap_vnode,
 184                         ps->purge_fid,
 185                         ps->replace );
 186
 187         begin = offset;
 188         *start = buffer + begin;
 189         len -= begin;
 190
 191         if ( len > length )
 192                 len = length;
 193         if ( len < 0 )
 194                 len = 0;
 195
 196         return len;
 197 }
 198
 199
 200 #ifdef CONFIG_PROC_FS
 201
 202 /*
 203  target directory structure:
 204    /proc/fs  (see linux/fs/proc/root.c)
 205    /proc/fs/coda
 206    /proc/fs/coda/{vfs_stats,
 207
 208 */
 209
 210 struct proc_dir_entry* proc_fs_coda;
 211
 212 #endif
 213
 214 #define coda_proc_create(name,get_info) \
 215         create_proc_info_entry(name, 0, proc_fs_coda, get_info)
 216
 217 void coda_sysctl_init(void)
 218 {
 219         reset_coda_vfs_stats();
 220         reset_coda_cache_inv_stats();
 221
 222 #ifdef CONFIG_PROC_FS
 223         proc_fs_coda = proc_mkdir("coda", proc_root_fs);
 224         if (proc_fs_coda) {
 225                 proc_fs_coda->owner = THIS_MODULE;
 226                 coda_proc_create("vfs_stats", coda_vfs_stats_get_info);
 227                 coda_proc_create("cache_inv_stats", coda_cache_inv_stats_get_info);
 228         }
 229 #endif
 230
 231 #ifdef CONFIG_SYSCTL
 232         if ( !fs_table_header )
 233                 fs_table_header = register_sysctl_table(fs_table, 0);
 234 #endif
 235 }
 236
 237 void coda_sysctl_clean(void)
 238 {
 239
 240 #ifdef CONFIG_SYSCTL
 241         if ( fs_table_header ) {
 242                 unregister_sysctl_table(fs_table_header);
 243                 fs_table_header = 0;
 244         }
 245 #endif
 246
 247 #ifdef CONFIG_PROC_FS
 248         remove_proc_entry("cache_inv_stats", proc_fs_coda);
 249         remove_proc_entry("vfs_stats", proc_fs_coda);
 250         remove_proc_entry("coda", proc_root_fs);
 251 #endif
 252 }