/*

   * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   * All Rights Reserved.

   *

   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as

   * published by the Free Software Foundation.
   *

   * This program is distributed in the hope that it would be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.

   *

   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write the Free Software Foundation,
   * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

   */

  #include "xfs.h"
  #include <linux/proc_fs.h>
  
  DEFINE_PER_CPU(struct xfsstats, xfsstats);

  static int xfs_stat_proc_show(struct seq_file *m, void *v)

  {

  	int		c, i, j, val;

  	__uint64_t	xs_xstrat_bytes = 0;
  	__uint64_t	xs_write_bytes = 0;
  	__uint64_t	xs_read_bytes = 0;

  	static const struct xstats_entry {

  		char	*desc;
  		int	endpoint;
  	} xstats[] = {
  		{ "extent_alloc",	XFSSTAT_END_EXTENT_ALLOC	},
  		{ "abt",		XFSSTAT_END_ALLOC_BTREE		},
  		{ "blk_map",		XFSSTAT_END_BLOCK_MAPPING	},
  		{ "bmbt",		XFSSTAT_END_BLOCK_MAP_BTREE	},
  		{ "dir",		XFSSTAT_END_DIRECTORY_OPS	},
  		{ "trans",		XFSSTAT_END_TRANSACTIONS	},
  		{ "ig",			XFSSTAT_END_INODE_OPS		},
  		{ "log",		XFSSTAT_END_LOG_OPS		},
  		{ "push_ail",		XFSSTAT_END_TAIL_PUSHING	},
  		{ "xstrat",		XFSSTAT_END_WRITE_CONVERT	},
  		{ "rw",			XFSSTAT_END_READ_WRITE_OPS	},
  		{ "attr",		XFSSTAT_END_ATTRIBUTE_OPS	},
  		{ "icluster",		XFSSTAT_END_INODE_CLUSTER	},
  		{ "vnodes",		XFSSTAT_END_VNODE_OPS		},
  		{ "buf",		XFSSTAT_END_BUF			},

  		{ "abtb2",		XFSSTAT_END_ABTB_V2		},
  		{ "abtc2",		XFSSTAT_END_ABTC_V2		},
  		{ "bmbt2",		XFSSTAT_END_BMBT_V2		},
  		{ "ibt2",		XFSSTAT_END_IBT_V2		},

  	};
  
  	/* Loop over all stats groups */

  	for (i=j = 0; i < ARRAY_SIZE(xstats); i++) {
  		seq_printf(m, "%s", xstats[i].desc);

  		/* inner loop does each group */
  		while (j < xstats[i].endpoint) {
  			val = 0;
  			/* sum over all cpus */

  			for_each_possible_cpu(c)

  				val += *(((__u32*)&per_cpu(xfsstats, c) + j));

  			seq_printf(m, " %u", val);

  			j++;
  		}

  		seq_putc(m, '
  ');

  	}
  	/* extra precision counters */

  	for_each_possible_cpu(i) {

  		xs_xstrat_bytes += per_cpu(xfsstats, i).xs_xstrat_bytes;
  		xs_write_bytes += per_cpu(xfsstats, i).xs_write_bytes;
  		xs_read_bytes += per_cpu(xfsstats, i).xs_read_bytes;
  	}

  	seq_printf(m, "xpc %Lu %Lu %Lu
  ",

  			xs_xstrat_bytes, xs_write_bytes, xs_read_bytes);

  	seq_printf(m, "debug %u
  ",

  #if defined(DEBUG)
  		1);
  #else
  		0);
  #endif

  	return 0;
  }

  static int xfs_stat_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, xfs_stat_proc_show, NULL);

  }

  static const struct file_operations xfs_stat_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= xfs_stat_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };

  int

  xfs_init_procfs(void)
  {
  	if (!proc_mkdir("fs/xfs", NULL))

  		goto out;

  	if (!proc_create("fs/xfs/stat", 0, NULL,
  			 &xfs_stat_proc_fops))

  		goto out_remove_entry;
  	return 0;
  
   out_remove_entry:
  	remove_proc_entry("fs/xfs", NULL);
   out:
  	return -ENOMEM;

  }
  
  void
  xfs_cleanup_procfs(void)
  {
  	remove_proc_entry("fs/xfs/stat", NULL);
  	remove_proc_entry("fs/xfs", NULL);
  }