text: /*
   * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   *
   * This copyrighted material is made available to anyone wishing to use,
   * modify, copy, or redistribute it subject to the terms and conditions
   * of the GNU General Public License version 2.
   */
  
  #ifndef __RGRP_DOT_H__
  #define __RGRP_DOT_H__
  
  #include <linux/slab.h>
  #include <linux/uaccess.h>
  
  /* Since each block in the file system is represented by two bits in the
   * bitmap, one 64-bit word in the bitmap will represent 32 blocks.
   * By reserving 32 blocks at a time, we can optimize / shortcut how we search
   * through the bitmaps by looking a word at a time.
   */
  #define RGRP_RSRV_MINBYTES 8
  #define RGRP_RSRV_MINBLKS ((u32)(RGRP_RSRV_MINBYTES * GFS2_NBBY))
  #define RGRP_RSRV_ADDBLKS 64
  
  struct gfs2_rgrpd;
  struct gfs2_sbd;
  struct gfs2_holder;
  
  extern void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd);
  
  extern struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk, bool exact);
  extern struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp);
  extern struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd);
  
  extern void gfs2_clear_rgrpd(struct gfs2_sbd *sdp);
  extern int gfs2_rindex_update(struct gfs2_sbd *sdp);
  extern void gfs2_free_clones(struct gfs2_rgrpd *rgd);
  extern int gfs2_rgrp_go_lock(struct gfs2_holder *gh);
  extern void gfs2_rgrp_brelse(struct gfs2_rgrpd *rgd);
  extern void gfs2_rgrp_go_unlock(struct gfs2_holder *gh);
  
  extern struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip);
  
  #define GFS2_AF_ORLOV 1
  extern int gfs2_inplace_reserve(struct gfs2_inode *ip,
  				struct gfs2_alloc_parms *ap);
  extern void gfs2_inplace_release(struct gfs2_inode *ip);
  
  extern int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
  			     bool dinode, u64 *generation);
  
  extern int gfs2_rsqa_alloc(struct gfs2_inode *ip);
  extern void gfs2_rs_deltree(struct gfs2_blkreserv *rs);
  extern void gfs2_rsqa_delete(struct gfs2_inode *ip, atomic_t *wcount);
  extern void __gfs2_free_blocks(struct gfs2_inode *ip, u64 bstart, u32 blen, int meta);
  extern void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen);
  extern void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip);
  extern void gfs2_unlink_di(struct inode *inode);
  extern int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr,
  			       unsigned int type);
  
  struct gfs2_rgrp_list {
  	unsigned int rl_rgrps;
  	unsigned int rl_space;
  	struct gfs2_rgrpd **rl_rgd;
  	struct gfs2_holder *rl_ghs;
  };
  
  extern void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
  			   u64 block);
  extern void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state);
  extern void gfs2_rlist_free(struct gfs2_rgrp_list *rlist);
  extern u64 gfs2_ri_total(struct gfs2_sbd *sdp);
  extern void gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl);
  extern int gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
  				   struct buffer_head *bh,
  				   const struct gfs2_bitmap *bi, unsigned minlen, u64 *ptrimmed);
  extern int gfs2_fitrim(struct file *filp, void __user *argp);
  
  /* This is how to tell if a reservation is in the rgrp tree: */
  static inline bool gfs2_rs_active(const struct gfs2_blkreserv *rs)
  {
  	return rs && !RB_EMPTY_NODE(&rs->rs_node);
  }
  
  extern void check_and_update_goal(struct gfs2_inode *ip);
  #endif /* __RGRP_DOT_H__ */
  