[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / xfs / 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__ */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of version 2 of the GNU General Public License as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it would be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	11	*
	12	* Further, this software is distributed without any warranty that it is
	13	* free of the rightful claim of any third person regarding infringement
	14	* or the like. Any license provided herein, whether implied or
	15	* otherwise, applies only to this software file. Patent licenses, if
	16	* any, provided herein do not apply to combinations of this program with
	17	* other software, or any other product whatsoever.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write the Free Software Foundation, Inc., 59
	21	* Temple Place - Suite 330, Boston MA 02111-1307, USA.
	22	*
	23	* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
	24	* Mountain View, CA 94043, or:
	25	*
	26	* http://www.sgi.com
	27	*
	28	* For further information regarding this notice, see:
	29	*
	30	* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
	31	*/
	32	#ifndef __XFS_RTALLOC_H__
	33	#define __XFS_RTALLOC_H__
	34
	35	struct xfs_mount;
	36	struct xfs_trans;
	37
	38	#define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
	39
	40	/* Min and max rt extent sizes, specified in bytes */
	41	#define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
	42	#define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64KB */
	43	#define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4KB */
	44
	45	/*
	46	* Constants for bit manipulations.
	47	*/
	48	#define XFS_NBBYLOG 3 /* log2(NBBY) */
	49	#define XFS_WORDLOG 2 /* log2(sizeof(xfs_rtword_t)) */
	50	#define XFS_NBWORDLOG (XFS_NBBYLOG + XFS_WORDLOG)
	51	#define XFS_NBWORD (1 << XFS_NBWORDLOG)
	52	#define XFS_WORDMASK ((1 << XFS_WORDLOG) - 1)
	53
	54	#define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
	55	#define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
	56	#define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize)
	57	#define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask)
	58
	59	/*
	60	* Summary and bit manipulation macros.
	61	*/
	62	#define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
	63	#define XFS_SUMOFFSTOBLOCK(mp,s) \
	64	(((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
65	#define XFS_SUMPTR(mp,bp,so) \
66	((xfs_suminfo_t )((char )XFS_BUF_PTR(bp) + \
67	(((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
68
69	#define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log)
70	#define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log)
71	#define XFS_BITTOWORD(mp,bi) \
72	((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
73
74	#define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
75	#define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))
76
77	#define XFS_RTLOBIT(w) xfs_lowbit32(w)
78	#define XFS_RTHIBIT(w) xfs_highbit32(w)
79
80	#if XFS_BIG_BLKNOS
81	#define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
82	#else
83	#define XFS_RTBLOCKLOG(b) xfs_highbit32(b)
84	#endif
85
86
87	#ifdef __KERNEL__
88
89	#ifdef CONFIG_XFS_RT
90	/*
91	* Function prototypes for exported functions.
92	*/
93
94	/*
95	* Allocate an extent in the realtime subvolume, with the usual allocation
96	* parameters. The length units are all in realtime extents, as is the
97	* result block number.
98	*/
99	int /* error */
100	xfs_rtallocate_extent(
101	struct xfs_trans tp, / transaction pointer */
102	xfs_rtblock_t bno, /* starting block number to allocate */
103	xfs_extlen_t minlen, /* minimum length to allocate */
104	xfs_extlen_t maxlen, /* maximum length to allocate */
105	xfs_extlen_t len, / out: actual length allocated */
106	xfs_alloctype_t type, /* allocation type XFS_ALLOCTYPE... */
107	int wasdel, /* was a delayed allocation extent */
108	xfs_extlen_t prod, /* extent product factor */
109	xfs_rtblock_t rtblock); / out: start block allocated */
110
111	/*
112	* Free an extent in the realtime subvolume. Length is expressed in
113	* realtime extents, as is the block number.
114	*/
115	int /* error */
116	xfs_rtfree_extent(
117	struct xfs_trans tp, / transaction pointer */
118	xfs_rtblock_t bno, /* starting block number to free */
119	xfs_extlen_t len); /* length of extent freed */
120
121	/*
122	* Initialize realtime fields in the mount structure.
123	*/
124	int /* error */
125	xfs_rtmount_init(
126	struct xfs_mount mp); / file system mount structure */
127
128	/*
129	* Get the bitmap and summary inodes into the mount structure
130	* at mount time.
131	*/
132	int /* error */
133	xfs_rtmount_inodes(
134	struct xfs_mount mp); / file system mount structure */
135
136	/*
137	* Pick an extent for allocation at the start of a new realtime file.
138	* Use the sequence number stored in the atime field of the bitmap inode.
139	* Translate this to a fraction of the rtextents, and return the product
140	* of rtextents and the fraction.
141	* The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
142	*/
143	int /* error */
144	xfs_rtpick_extent(
145	struct xfs_mount mp, / file system mount point */
146	struct xfs_trans tp, / transaction pointer */
147	xfs_extlen_t len, /* allocation length (rtextents) */
148	xfs_rtblock_t pick); / result rt extent */
149
150	/*
151	* Debug code: print out the value of a range in the bitmap.
152	*/
153	void
154	xfs_rtprint_range(
155	struct xfs_mount mp, / file system mount structure */
156	struct xfs_trans tp, / transaction pointer */
157	xfs_rtblock_t start, /* starting block to print */
158	xfs_extlen_t len); /* length to print */
159
160	/*
161	* Debug code: print the summary file.
162	*/
163	void
164	xfs_rtprint_summary(
165	struct xfs_mount mp, / file system mount structure */
166	struct xfs_trans tp); / transaction pointer */
167
168	/*
169	* Grow the realtime area of the filesystem.
170	*/
171	int
172	xfs_growfs_rt(
173	struct xfs_mount mp, / file system mount structure */
174	xfs_growfs_rt_t in); / user supplied growfs struct */
175
176	#else
177	# define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb) (ENOSYS)
178	# define xfs_rtfree_extent(t,b,l) (ENOSYS)
179	# define xfs_rtpick_extent(m,t,l,rb) (ENOSYS)
180	# define xfs_growfs_rt(mp,in) (ENOSYS)
181	# define xfs_rtmount_init(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
182	# define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
183	#endif /* CONFIG_XFS_RT */
184
185	#endif /* __KERNEL__ */
186
187	#endif /* __XFS_RTALLOC_H__ */