/*

   * procfs-based user access to knfsd statistics
   *
   * /proc/net/rpc/nfsd
   *
   * Format:
   *	rc <hits> <misses> <nocache>
   *			Statistsics for the reply cache
   *	fh <stale> <total-lookups> <anonlookups> <dir-not-in-dcache> <nondir-not-in-dcache>
   *			statistics for filehandle lookup

   *	io <bytes-read> <bytes-written>

   *			statistics for IO throughput
   *	th <threads> <fullcnt> <10%-20%> <20%-30%> ... <90%-100%> <100%> 
   *			time (seconds) when nfsd thread usage above thresholds
   *			and number of times that all threads were in use
   *	ra cache-size  <10%  <20%  <30% ... <100% not-found
   *			number of times that read-ahead entry was found that deep in
   *			the cache.
   *	plus generic RPC stats (see net/sunrpc/stats.c)
   *
   * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   */

  #include <linux/seq_file.h>

  #include <linux/module.h>

  #include <linux/sunrpc/stats.h>

  #include <net/net_namespace.h>

  #include "nfsd.h"

  struct nfsd_stats	nfsdstats;
  struct svc_stat		nfsd_svcstats = {
  	.program	= &nfsd_program,
  };
  
  static int nfsd_proc_show(struct seq_file *seq, void *v)
  {
  	int i;
  
  	seq_printf(seq, "rc %u %u %u
  fh %u %u %u %u %u
  io %u %u
  ",
  		      nfsdstats.rchits,
  		      nfsdstats.rcmisses,
  		      nfsdstats.rcnocache,
  		      nfsdstats.fh_stale,
  		      nfsdstats.fh_lookup,
  		      nfsdstats.fh_anon,
  		      nfsdstats.fh_nocache_dir,
  		      nfsdstats.fh_nocache_nondir,
  		      nfsdstats.io_read,
  		      nfsdstats.io_write);
  	/* thread usage: */
  	seq_printf(seq, "th %u %u", nfsdstats.th_cnt, nfsdstats.th_fullcnt);
  	for (i=0; i<10; i++) {
  		unsigned int jifs = nfsdstats.th_usage[i];
  		unsigned int sec = jifs / HZ, msec = (jifs % HZ)*1000/HZ;
  		seq_printf(seq, " %u.%03u", sec, msec);
  	}
  
  	/* newline and ra-cache */
  	seq_printf(seq, "
  ra %u", nfsdstats.ra_size);
  	for (i=0; i<11; i++)
  		seq_printf(seq, " %u", nfsdstats.ra_depth[i]);
  	seq_putc(seq, '
  ');
  	
  	/* show my rpc info */
  	svc_seq_show(seq, &nfsd_svcstats);

  #ifdef CONFIG_NFSD_V4
  	/* Show count for individual nfsv4 operations */
  	/* Writing operation numbers 0 1 2 also for maintaining uniformity */
  	seq_printf(seq,"proc4ops %u", LAST_NFS4_OP + 1);
  	for (i = 0; i <= LAST_NFS4_OP; i++)
  		seq_printf(seq, " %u", nfsdstats.nfs4_opcount[i]);
  
  	seq_putc(seq, '
  ');
  #endif

  	return 0;
  }
  
  static int nfsd_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, nfsd_proc_show, NULL);
  }

  static const struct file_operations nfsd_proc_fops = {

  	.open = nfsd_proc_open,
  	.read  = seq_read,
  	.llseek = seq_lseek,
  	.release = single_release,
  };
  
  void
  nfsd_stat_init(void)
  {

  	svc_proc_register(&init_net, &nfsd_svcstats, &nfsd_proc_fops);

  }
  
  void
  nfsd_stat_shutdown(void)
  {

  	svc_proc_unregister(&init_net, "nfsd");

  }