text: /*
   * 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
   */
  #ifndef __XFS_RTALLOC_H__
  #define	__XFS_RTALLOC_H__
  
  /* kernel only definitions and functions */
  
  struct xfs_mount;
  struct xfs_trans;
  
  #ifdef CONFIG_XFS_RT
  /*
   * Function prototypes for exported functions.
   */
  
  /*
   * Allocate an extent in the realtime subvolume, with the usual allocation
   * parameters.  The length units are all in realtime extents, as is the
   * result block number.
   */
  int					/* error */
  xfs_rtallocate_extent(
  	struct xfs_trans	*tp,	/* transaction pointer */
  	xfs_rtblock_t		bno,	/* starting block number to allocate */
  	xfs_extlen_t		minlen,	/* minimum length to allocate */
  	xfs_extlen_t		maxlen,	/* maximum length to allocate */
  	xfs_extlen_t		*len,	/* out: actual length allocated */
  	xfs_alloctype_t		type,	/* allocation type XFS_ALLOCTYPE... */
  	int			wasdel,	/* was a delayed allocation extent */
  	xfs_extlen_t		prod,	/* extent product factor */
  	xfs_rtblock_t		*rtblock); /* out: start block allocated */
  
  /*
   * Free an extent in the realtime subvolume.  Length is expressed in
   * realtime extents, as is the block number.
   */
  int					/* error */
  xfs_rtfree_extent(
  	struct xfs_trans	*tp,	/* transaction pointer */
  	xfs_rtblock_t		bno,	/* starting block number to free */
  	xfs_extlen_t		len);	/* length of extent freed */
  
  /*
   * Initialize realtime fields in the mount structure.
   */
  int					/* error */
  xfs_rtmount_init(
  	struct xfs_mount	*mp);	/* file system mount structure */
  void
  xfs_rtunmount_inodes(
  	struct xfs_mount	*mp);
  
  /*
   * Get the bitmap and summary inodes into the mount structure
   * at mount time.
   */
  int					/* error */
  xfs_rtmount_inodes(
  	struct xfs_mount	*mp);	/* file system mount structure */
  
  /*
   * Pick an extent for allocation at the start of a new realtime file.
   * Use the sequence number stored in the atime field of the bitmap inode.
   * Translate this to a fraction of the rtextents, and return the product
   * of rtextents and the fraction.
   * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
   */
  int					/* error */
  xfs_rtpick_extent(
  	struct xfs_mount	*mp,	/* file system mount point */
  	struct xfs_trans	*tp,	/* transaction pointer */
  	xfs_extlen_t		len,	/* allocation length (rtextents) */
  	xfs_rtblock_t		*pick);	/* result rt extent */
  
  /*
   * Grow the realtime area of the filesystem.
   */
  int
  xfs_growfs_rt(
  	struct xfs_mount	*mp,	/* file system mount structure */
  	xfs_growfs_rt_t		*in);	/* user supplied growfs struct */
  
  /*
   * From xfs_rtbitmap.c
   */
  int xfs_rtcheck_range(struct xfs_mount *mp, struct xfs_trans *tp,
  		      xfs_rtblock_t start, xfs_extlen_t len, int val,
  		      xfs_rtblock_t *new, int *stat);
  int xfs_rtfind_back(struct xfs_mount *mp, struct xfs_trans *tp,
  		    xfs_rtblock_t start, xfs_rtblock_t limit,
  		    xfs_rtblock_t *rtblock);
  int xfs_rtfind_forw(struct xfs_mount *mp, struct xfs_trans *tp,
  		    xfs_rtblock_t start, xfs_rtblock_t limit,
  		    xfs_rtblock_t *rtblock);
  int xfs_rtmodify_range(struct xfs_mount *mp, struct xfs_trans *tp,
  		       xfs_rtblock_t start, xfs_extlen_t len, int val);
  int xfs_rtmodify_summary_int(struct xfs_mount *mp, struct xfs_trans *tp,
  			     int log, xfs_rtblock_t bbno, int delta,
  			     xfs_buf_t **rbpp, xfs_fsblock_t *rsb,
  			     xfs_suminfo_t *sum);
  int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log,
  			 xfs_rtblock_t bbno, int delta, xfs_buf_t **rbpp,
  			 xfs_fsblock_t *rsb);
  int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp,
  		     xfs_rtblock_t start, xfs_extlen_t len,
  		     struct xfs_buf **rbpp, xfs_fsblock_t *rsb);
  
  
  #else
  # define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb)  (ENOSYS)
  # define xfs_rtfree_extent(t,b,l)                       (ENOSYS)
  # define xfs_rtpick_extent(m,t,l,rb)                    (ENOSYS)
  # define xfs_growfs_rt(mp,in)                           (ENOSYS)
  static inline int		/* error */
  xfs_rtmount_init(
  	xfs_mount_t	*mp)	/* file system mount structure */
  {
  	if (mp->m_sb.sb_rblocks == 0)
  		return 0;
  
  	xfs_warn(mp, "Not built with CONFIG_XFS_RT");
  	return -ENOSYS;
  }
  # define xfs_rtmount_inodes(m)  (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
  # define xfs_rtunmount_inodes(m)
  #endif	/* CONFIG_XFS_RT */
  
  #endif	/* __XFS_RTALLOC_H__ */
  