fs/xfs/xfs_rtalloc.h - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2 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.
  *
  * Further, this software is distributed without any warranty that it is
  * free of the rightful claim of any third person regarding infringement
  * or the like.  Any license provided herein, whether implied or
  * otherwise, applies only to this software file.  Patent licenses, if
  * any, provided herein do not apply to combinations of this program with
  * other software, or any other product whatsoever.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, write the Free Software Foundation, Inc., 59
  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  *
  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  * Mountain View, CA  94043, or:
  *
  * http://www.sgi.com
  *
  * For further information regarding this notice, see:
  *
  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  */
 #ifndef __XFS_RTALLOC_H__
 #define	__XFS_RTALLOC_H__

 struct xfs_mount;
 struct xfs_trans;

 #define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)

 /* Min and max rt extent sizes, specified in bytes */
 #define	XFS_MAX_RTEXTSIZE	(1024 * 1024 * 1024)	/* 1GB */
 #define	XFS_DFL_RTEXTSIZE	(64 * 1024)	        /* 64KB */
 #define	XFS_MIN_RTEXTSIZE	(4 * 1024)		/* 4KB */

 /*
  * Constants for bit manipulations.
  */
 #define	XFS_NBBYLOG	3		/* log2(NBBY) */
 #define	XFS_WORDLOG	2		/* log2(sizeof(xfs_rtword_t)) */
 #define	XFS_NBWORDLOG	(XFS_NBBYLOG + XFS_WORDLOG)
 #define	XFS_NBWORD	(1 << XFS_NBWORDLOG)
 #define	XFS_WORDMASK	((1 << XFS_WORDLOG) - 1)

 #define	XFS_BLOCKSIZE(mp)	((mp)->m_sb.sb_blocksize)
 #define	XFS_BLOCKMASK(mp)	((mp)->m_blockmask)
 #define	XFS_BLOCKWSIZE(mp)	((mp)->m_blockwsize)
 #define	XFS_BLOCKWMASK(mp)	((mp)->m_blockwmask)

 /*
  * Summary and bit manipulation macros.
  */
 #define	XFS_SUMOFFS(mp,ls,bb)	((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
 #define	XFS_SUMOFFSTOBLOCK(mp,s)	\
 	(((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
 #define	XFS_SUMPTR(mp,bp,so)	\
 	((xfs_suminfo_t *)((char *)XFS_BUF_PTR(bp) + \
 		(((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))

 #define	XFS_BITTOBLOCK(mp,bi)	((bi) >> (mp)->m_blkbit_log)
 #define	XFS_BLOCKTOBIT(mp,bb)	((bb) << (mp)->m_blkbit_log)
 #define	XFS_BITTOWORD(mp,bi)	\
 	((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))

 #define	XFS_RTMIN(a,b)	((a) < (b) ? (a) : (b))
 #define	XFS_RTMAX(a,b)	((a) > (b) ? (a) : (b))

 #define	XFS_RTLOBIT(w)	xfs_lowbit32(w)
 #define	XFS_RTHIBIT(w)	xfs_highbit32(w)

 #if XFS_BIG_BLKNOS
 #define	XFS_RTBLOCKLOG(b)	xfs_highbit64(b)
 #else
 #define	XFS_RTBLOCKLOG(b)	xfs_highbit32(b)
 #endif


 #ifdef __KERNEL__

 #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 */

 /*
  * 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 */

 /*
  * Debug code: print out the value of a range in the bitmap.
  */
 void
 xfs_rtprint_range(
 	struct xfs_mount	*mp,	/* file system mount structure */
 	struct xfs_trans	*tp,	/* transaction pointer */
 	xfs_rtblock_t		start,	/* starting block to print */
 	xfs_extlen_t		len);	/* length to print */

 /*
  * Debug code: print the summary file.
  */
 void
 xfs_rtprint_summary(
 	struct xfs_mount	*mp,	/* file system mount structure */
 	struct xfs_trans	*tp);	/* transaction pointer */

 /*
  * 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 */

 #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)
 # define xfs_rtmount_init(m)    (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
 # define xfs_rtmount_inodes(m)  (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
 #endif	/* CONFIG_XFS_RT */

 #endif	/* __KERNEL__ */

 #endif	/* __XFS_RTALLOC_H__ */
	/*
	* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of version 2 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.
	*
	* Further, this software is distributed without any warranty that it is
	* free of the rightful claim of any third person regarding infringement
	* or the like. Any license provided herein, whether implied or
	* otherwise, applies only to this software file. Patent licenses, if
	* any, provided herein do not apply to combinations of this program with
	* other software, or any other product whatsoever.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write the Free Software Foundation, Inc., 59
	* Temple Place - Suite 330, Boston MA 02111-1307, USA.
	*
	* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
	* Mountain View, CA 94043, or:
	*
	* http://www.sgi.com
	*
	* For further information regarding this notice, see:
	*
	* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
	*/
	#ifndef __XFS_RTALLOC_H__
	#define __XFS_RTALLOC_H__

	struct xfs_mount;
	struct xfs_trans;

	#define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)

	/* Min and max rt extent sizes, specified in bytes */
	#define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
	#define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64KB */
	#define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4KB */

	/*
	* Constants for bit manipulations.
	*/
	#define XFS_NBBYLOG 3 /* log2(NBBY) */
	#define XFS_WORDLOG 2 /* log2(sizeof(xfs_rtword_t)) */
	#define XFS_NBWORDLOG (XFS_NBBYLOG + XFS_WORDLOG)
	#define XFS_NBWORD (1 << XFS_NBWORDLOG)
	#define XFS_WORDMASK ((1 << XFS_WORDLOG) - 1)

	#define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
	#define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
	#define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize)
	#define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask)

	/*
	* Summary and bit manipulation macros.
	*/
	#define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
	#define XFS_SUMOFFSTOBLOCK(mp,s) \
	(((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
	#define XFS_SUMPTR(mp,bp,so) \
	((xfs_suminfo_t )((char )XFS_BUF_PTR(bp) + \
	(((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))

	#define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log)
	#define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log)
	#define XFS_BITTOWORD(mp,bi) \
	((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))

	#define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
	#define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))

	#define XFS_RTLOBIT(w) xfs_lowbit32(w)
	#define XFS_RTHIBIT(w) xfs_highbit32(w)

	#if XFS_BIG_BLKNOS
	#define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
	#else
	#define XFS_RTBLOCKLOG(b) xfs_highbit32(b)
	#endif


	#ifdef __KERNEL__

	#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 */

	/*
	* 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 */

	/*
	* Debug code: print out the value of a range in the bitmap.
	*/
	void
	xfs_rtprint_range(
	struct xfs_mount mp, / file system mount structure */
	struct xfs_trans tp, / transaction pointer */
	xfs_rtblock_t start, /* starting block to print */
	xfs_extlen_t len); /* length to print */

	/*
	* Debug code: print the summary file.
	*/
	void
	xfs_rtprint_summary(
	struct xfs_mount mp, / file system mount structure */
	struct xfs_trans tp); / transaction pointer */

	/*
	* 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 */

	#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)
	# define xfs_rtmount_init(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
	# define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
	#endif /* CONFIG_XFS_RT */

	#endif /* __KERNEL__ */

	#endif /* __XFS_RTALLOC_H__ */