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/*
* Sysctl operations for Coda filesystem
* Original version: (C) 1996 P. Braam and M. Callahan
* Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
*
* Carnegie Mellon encourages users to contribute improvements to
* the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
*
* CODA operation statistics
* (c) March, 1998 Zhanyong Wan <zhanyong.wan@yale.edu>
*
*/
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/sysctl.h>
#include <linux/swapctl.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/ctype.h>
#include <asm/bitops.h>
#include <asm/segment.h>
#include <asm/uaccess.h>
#include <linux/utsname.h>
#define __NO_VERSION__
#include <linux/module.h>
#include <linux/coda.h>
#include <linux/coda_linux.h>
#include <linux/coda_fs_i.h>
#include <linux/coda_psdev.h>
#include <linux/coda_cache.h>
#include <linux/coda_proc.h>
static struct ctl_table_header *fs_table_header;
#define FS_CODA 1 /* Coda file system */
#define CODA_DEBUG 1 /* control debugging */
#define CODA_ENTRY 2 /* control enter/leave pattern */
#define CODA_TIMEOUT 3 /* timeout on upcalls to become intrble */
#define CODA_MC 4 /* use/do not use the access cache */
#define CODA_HARD 5 /* mount type "hard" or "soft" */
#define CODA_VFS 6 /* vfs statistics */
#define CODA_UPCALL 7 /* upcall statistics */
#define CODA_PERMISSION 8 /* permission statistics */
#define CODA_CACHE_INV 9 /* cache invalidation statistics */
#define CODA_FAKE_STATFS 10 /* don't query venus for actual cache usage */
static ctl_table coda_table[] = {
{CODA_DEBUG, "debug", &coda_debug, sizeof(int), 0644, NULL, &proc_dointvec},
{CODA_ENTRY, "printentry", &coda_print_entry, sizeof(int), 0644, NULL, &proc_dointvec},
{CODA_MC, "accesscache", &coda_access_cache, sizeof(int), 0644, NULL, &proc_dointvec},
{CODA_TIMEOUT, "timeout", &coda_timeout, sizeof(int), 0644, NULL, &proc_dointvec},
{CODA_HARD, "hard", &coda_hard, sizeof(int), 0644, NULL, &proc_dointvec},
{CODA_VFS, "vfs_stats", NULL, 0, 0644, NULL, &do_reset_coda_vfs_stats},
{CODA_UPCALL, "upcall_stats", NULL, 0, 0644, NULL, &do_reset_coda_upcall_stats},
{CODA_PERMISSION, "permission_stats", NULL, 0, 0644, NULL, &do_reset_coda_permission_stats},
{CODA_CACHE_INV, "cache_inv_stats", NULL, 0, 0644, NULL, &do_reset_coda_cache_inv_stats},
{CODA_FAKE_STATFS, "fake_statfs", &coda_fake_statfs, sizeof(int), 0600, NULL, &proc_dointvec},
{ 0 }
};
static ctl_table fs_table[] = {
{FS_CODA, "coda", NULL, 0, 0555, coda_table},
{0}
};
struct coda_vfs_stats coda_vfs_stat;
struct coda_permission_stats coda_permission_stat;
struct coda_cache_inv_stats coda_cache_inv_stat;
struct coda_upcall_stats_entry coda_upcall_stat[CODA_NCALLS];
struct coda_upcallstats coda_callstats;
int coda_upcall_timestamping = 0;
/* keep this in sync with coda.h! */
char *coda_upcall_names[] = {
"totals ", /* 0 */
"- ", /* 1 */
"root ", /* 2 */
"open_by_fd ", /* 3 */
"open ", /* 4 */
"close ", /* 5 */
"ioctl ", /* 6 */
"getattr ", /* 7 */
"setattr ", /* 8 */
"access ", /* 9 */
"lookup ", /* 10 */
"create ", /* 11 */
"remove ", /* 12 */
"link ", /* 13 */
"rename ", /* 14 */
"mkdir ", /* 15 */
"rmdir ", /* 16 */
"readdir ", /* 17 */
"symlink ", /* 18 */
"readlink ", /* 19 */
"fsync ", /* 20 */
"- ", /* 21 */
"vget ", /* 22 */
"signal ", /* 23 */
"replace ", /* 24 */
"flush ", /* 25 */
"purgeuser ", /* 26 */
"zapfile ", /* 27 */
"zapdir ", /* 28 */
"- ", /* 29 */
"purgefid ", /* 30 */
"open_by_path", /* 31 */
"resolve ", /* 32 */
"reintegrate ", /* 33 */
"statfs ", /* 34 */
"store ", /* 35 */
"release " /* 36 */
};
void reset_coda_vfs_stats( void )
{
memset( &coda_vfs_stat, 0, sizeof( coda_vfs_stat ) );
}
void reset_coda_upcall_stats( void )
{
memset( &coda_upcall_stat, 0, sizeof( coda_upcall_stat ) );
}
void reset_coda_permission_stats( void )
{
memset( &coda_permission_stat, 0, sizeof( coda_permission_stat ) );
}
void reset_coda_cache_inv_stats( void )
{
memset( &coda_cache_inv_stat, 0, sizeof( coda_cache_inv_stat ) );
}
void do_time_stats( struct coda_upcall_stats_entry * pentry,
unsigned long runtime )
{
unsigned long time = runtime; /* time in us */
CDEBUG(D_SPECIAL, "time: %ld\n", time);
if ( pentry->count == 0 ) {
pentry->time_sum = pentry->time_squared_sum = 0;
}
pentry->count++;
pentry->time_sum += time;
pentry->time_squared_sum += time*time;
}
void coda_upcall_stats(int opcode, long unsigned runtime)
{
struct coda_upcall_stats_entry * pentry;
if ( opcode < 0 || opcode > CODA_NCALLS - 1) {
printk("Nasty opcode %d passed to coda_upcall_stats\n",
opcode);
return;
}
pentry = &coda_upcall_stat[opcode];
do_time_stats(pentry, runtime);
/* fill in the totals */
pentry = &coda_upcall_stat[0];
do_time_stats(pentry, runtime);
}
unsigned long get_time_average( const struct coda_upcall_stats_entry * pentry )
{
return ( pentry->count == 0 ) ? 0 : pentry->time_sum / pentry->count;
}
static inline unsigned long absolute( unsigned long x )
{
return x >= 0 ? x : -x;
}
static unsigned long sqr_root( unsigned long x )
{
unsigned long y = x, r;
int n_bit = 0;
if ( x == 0 )
return 0;
if ( x < 0)
x = -x;
while ( y ) {
y >>= 1;
n_bit++;
}
r = 1 << (n_bit/2);
while ( 1 ) {
r = (r + x/r)/2;
if ( r*r <= x && x < (r+1)*(r+1) )
break;
}
return r;
}
unsigned long get_time_std_deviation( const struct coda_upcall_stats_entry * pentry )
{
unsigned long time_avg;
if ( pentry->count <= 1 )
return 0;
time_avg = get_time_average( pentry );
return sqr_root( (pentry->time_squared_sum / pentry->count) -
time_avg * time_avg );
}
int do_reset_coda_vfs_stats( ctl_table * table, int write, struct file * filp,
void * buffer, size_t * lenp )
{
if ( write ) {
reset_coda_vfs_stats();
filp->f_pos += *lenp;
} else {
*lenp = 0;
}
return 0;
}
int do_reset_coda_upcall_stats( ctl_table * table, int write,
struct file * filp, void * buffer,
size_t * lenp )
{
if ( write ) {
if (*lenp > 0) {
char c;
if (get_user(c, (char *)buffer))
return -EFAULT;
coda_upcall_timestamping = (c == '1');
}
reset_coda_upcall_stats();
filp->f_pos += *lenp;
} else {
*lenp = 0;
}
return 0;
}
int do_reset_coda_permission_stats( ctl_table * table, int write,
struct file * filp, void * buffer,
size_t * lenp )
{
if ( write ) {
reset_coda_permission_stats();
filp->f_pos += *lenp;
} else {
*lenp = 0;
}
return 0;
}
int do_reset_coda_cache_inv_stats( ctl_table * table, int write,
struct file * filp, void * buffer,
size_t * lenp )
{
if ( write ) {
reset_coda_cache_inv_stats();
filp->f_pos += *lenp;
} else {
*lenp = 0;
}
return 0;
}
int coda_vfs_stats_get_info( char * buffer, char ** start, off_t offset,
int length)
{
int len=0;
off_t begin;
struct coda_vfs_stats * ps = & coda_vfs_stat;
/* this works as long as we are below 1024 characters! */
len += sprintf( buffer,
"Coda VFS statistics\n"
"===================\n\n"
"File Operations:\n"
"\topen\t\t%9d\n"
"\tflush\t\t%9d\n"
"\trelease\t\t%9d\n"
"\tfsync\t\t%9d\n\n"
"Dir Operations:\n"
"\treaddir\t\t%9d\n\n"
"Inode Operations\n"
"\tcreate\t\t%9d\n"
"\tlookup\t\t%9d\n"
"\tlink\t\t%9d\n"
"\tunlink\t\t%9d\n"
"\tsymlink\t\t%9d\n"
"\tmkdir\t\t%9d\n"
"\trmdir\t\t%9d\n"
"\trename\t\t%9d\n"
"\tpermission\t%9d\n",
/* file operations */
ps->open,
ps->flush,
ps->release,
ps->fsync,
/* dir operations */
ps->readdir,
/* inode operations */
ps->create,
ps->lookup,
ps->link,
ps->unlink,
ps->symlink,
ps->mkdir,
ps->rmdir,
ps->rename,
ps->permission);
begin = offset;
*start = buffer + begin;
len -= begin;
if ( len > length )
len = length;
if ( len < 0 )
len = 0;
return len;
}
int coda_upcall_stats_get_info( char * buffer, char ** start, off_t offset,
int length)
{
int len=0;
int i;
off_t begin;
off_t pos = 0;
char tmpbuf[80];
int tmplen = 0;
/* this works as long as we are below 1024 characters! */
if ( offset < 80 )
len += sprintf( buffer,"%-79s\n", "Coda upcall statistics");
if ( offset < 160)
len += sprintf( buffer + len,"%-79s\n", "======================");
if ( offset < 240)
len += sprintf( buffer + len,"%-79s\n", "upcall count avg time(us) std deviation(us)");
if ( offset < 320)
len += sprintf( buffer + len,"%-79s\n", "------ ----- ------------ -----------------");
pos = 320;
for ( i = 0 ; i < CODA_NCALLS ; i++ ) {
tmplen += sprintf(tmpbuf,"%s %9d %10ld %10ld",
coda_upcall_names[i],
coda_upcall_stat[i].count,
get_time_average(&coda_upcall_stat[i]),
coda_upcall_stat[i].time_squared_sum);
pos += 80;
if ( pos < offset )
continue;
len += sprintf(buffer + len, "%-79s\n", tmpbuf);
if ( len >= length )
break;
}
begin = len- (pos - offset);
*start = buffer + begin;
len -= begin;
if ( len > length )
len = length;
if ( len < 0 )
len = 0;
return len;
}
int coda_permission_stats_get_info( char * buffer, char ** start, off_t offset,
int length)
{
int len=0;
off_t begin;
struct coda_permission_stats * ps = & coda_permission_stat;
/* this works as long as we are below 1024 characters! */
len += sprintf( buffer,
"Coda permission statistics\n"
"==========================\n\n"
"count\t\t%9d\n"
"hit count\t%9d\n",
ps->count,
ps->hit_count );
begin = offset;
*start = buffer + begin;
len -= begin;
if ( len > length )
len = length;
if ( len < 0 )
len = 0;
return len;
}
int coda_cache_inv_stats_get_info( char * buffer, char ** start, off_t offset,
int length)
{
int len=0;
off_t begin;
struct coda_cache_inv_stats * ps = & coda_cache_inv_stat;
/* this works as long as we are below 1024 characters! */
len += sprintf( buffer,
"Coda cache invalidation statistics\n"
"==================================\n\n"
"flush\t\t%9d\n"
"purge user\t%9d\n"
"zap_dir\t\t%9d\n"
"zap_file\t%9d\n"
"zap_vnode\t%9d\n"
"purge_fid\t%9d\n"
"replace\t\t%9d\n",
ps->flush,
ps->purge_user,
ps->zap_dir,
ps->zap_file,
ps->zap_vnode,
ps->purge_fid,
ps->replace );
begin = offset;
*start = buffer + begin;
len -= begin;
if ( len > length )
len = length;
if ( len < 0 )
len = 0;
return len;
}
#ifdef CONFIG_PROC_FS
/*
target directory structure:
/proc/fs (see linux/fs/proc/root.c)
/proc/fs/coda
/proc/fs/coda/{vfs_stats,
*/
struct proc_dir_entry* proc_fs_coda;
#endif
#define coda_proc_create(name,get_info) \
create_proc_info_entry(name, 0, proc_fs_coda, get_info)
void coda_sysctl_init()
{
memset(&coda_callstats, 0, sizeof(coda_callstats));
reset_coda_vfs_stats();
reset_coda_upcall_stats();
reset_coda_permission_stats();
reset_coda_cache_inv_stats();
#ifdef CONFIG_PROC_FS
proc_fs_coda = proc_mkdir("coda", proc_root_fs);
if (proc_fs_coda) {
proc_fs_coda->owner = THIS_MODULE;
coda_proc_create("vfs_stats", coda_vfs_stats_get_info);
coda_proc_create("upcall_stats", coda_upcall_stats_get_info);
coda_proc_create("permission_stats", coda_permission_stats_get_info);
coda_proc_create("cache_inv_stats", coda_cache_inv_stats_get_info);
}
#endif
#ifdef CONFIG_SYSCTL
if ( !fs_table_header )
fs_table_header = register_sysctl_table(fs_table, 0);
#endif
}
void coda_sysctl_clean()
{
#ifdef CONFIG_SYSCTL
if ( fs_table_header ) {
unregister_sysctl_table(fs_table_header);
fs_table_header = 0;
}
#endif
#if CONFIG_PROC_FS
remove_proc_entry("cache_inv_stats", proc_fs_coda);
remove_proc_entry("permission_stats", proc_fs_coda);
remove_proc_entry("upcall_stats", proc_fs_coda);
remove_proc_entry("vfs_stats", proc_fs_coda);
remove_proc_entry("coda", proc_root_fs);
#endif
}
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