/*
   * 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 counter_val(int idx)
  {
  	int val = 0, cpu;
  
  	for_each_possible_cpu(cpu)
  		val += *(((__u32 *)&per_cpu(xfsstats, cpu) + idx));
  	return val;
  }
  
  static int xfs_stat_proc_show(struct seq_file *m, void *v)
  {
  	int		i, j;
  	__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		},
  		/* we print both series of quota information together */
  		{ "qm",			XFSSTAT_END_QM			},
  	};
  
  	/* 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 */
  		for (; j < xstats[i].endpoint; j++)
  			seq_printf(m, " %u", counter_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,
  };
  
  /* legacy quota interfaces */
  #ifdef CONFIG_XFS_QUOTA
  static int xqm_proc_show(struct seq_file *m, void *v)
  {
  	/* maximum; incore; ratio free to inuse; freelist */
  	seq_printf(m, "%d\t%d\t%d\t%u
  ",
  			0,
  			counter_val(XFSSTAT_END_XQMSTAT),
  			0,
  			counter_val(XFSSTAT_END_XQMSTAT + 1));
  	return 0;
  }
  
  static int xqm_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, xqm_proc_show, NULL);
  }
  
  static const struct file_operations xqm_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= xqm_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  
  /* legacy quota stats interface no 2 */
  static int xqmstat_proc_show(struct seq_file *m, void *v)
  {
  	int j;
  
  	seq_printf(m, "qm");
  	for (j = XFSSTAT_END_IBT_V2; j < XFSSTAT_END_XQMSTAT; j++)
  		seq_printf(m, " %u", counter_val(j));
  	seq_putc(m, '
  ');
  	return 0;
  }
  
  static int xqmstat_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, xqmstat_proc_show, NULL);
  }
  
  static const struct file_operations xqmstat_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= xqmstat_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  #endif /* CONFIG_XFS_QUOTA */
  
  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_xfs_dir;
  #ifdef CONFIG_XFS_QUOTA
  	if (!proc_create("fs/xfs/xqmstat", 0, NULL,
  			 &xqmstat_proc_fops))
  		goto out_remove_stat_file;
  	if (!proc_create("fs/xfs/xqm", 0, NULL,
  			 &xqm_proc_fops))
  		goto out_remove_xqmstat_file;
  #endif
  	return 0;
  
  #ifdef CONFIG_XFS_QUOTA
   out_remove_xqmstat_file:
  	remove_proc_entry("fs/xfs/xqmstat", NULL);
   out_remove_stat_file:
  	remove_proc_entry("fs/xfs/stat", NULL);
  #endif
   out_remove_xfs_dir:
  	remove_proc_entry("fs/xfs", NULL);
   out:
  	return -ENOMEM;
  }
  
  void
  xfs_cleanup_procfs(void)
  {
  #ifdef CONFIG_XFS_QUOTA
  	remove_proc_entry("fs/xfs/xqm", NULL);
  	remove_proc_entry("fs/xfs/xqmstat", NULL);
  #endif
  	remove_proc_entry("fs/xfs/stat", NULL);
  	remove_proc_entry("fs/xfs", NULL);
  }