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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18#ifndef __XFS_RTALLOC_H__
19#define __XFS_RTALLOC_H__
20
21struct xfs_mount;
22struct xfs_trans;
23
24#define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
25
26/* Min and max rt extent sizes, specified in bytes */
27#define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
28#define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64KB */
29#define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4KB */
30
31/*
32 * Constants for bit manipulations.
33 */
34#define XFS_NBBYLOG 3 /* log2(NBBY) */
35#define XFS_WORDLOG 2 /* log2(sizeof(xfs_rtword_t)) */
36#define XFS_NBWORDLOG (XFS_NBBYLOG + XFS_WORDLOG)
37#define XFS_NBWORD (1 << XFS_NBWORDLOG)
38#define XFS_WORDMASK ((1 << XFS_WORDLOG) - 1)
39
40#define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
41#define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
42#define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize)
43#define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask)
44
45/*
46 * Summary and bit manipulation macros.
47 */
48#define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
49#define XFS_SUMOFFSTOBLOCK(mp,s) \
50 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
51#define XFS_SUMPTR(mp,bp,so) \
52 ((xfs_suminfo_t *)((char *)XFS_BUF_PTR(bp) + \
53 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
54
55#define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log)
56#define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log)
57#define XFS_BITTOWORD(mp,bi) \
58 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
59
60#define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
61#define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))
62
63#define XFS_RTLOBIT(w) xfs_lowbit32(w)
64#define XFS_RTHIBIT(w) xfs_highbit32(w)
65
66#if XFS_BIG_BLKNOS
67#define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
68#else
69#define XFS_RTBLOCKLOG(b) xfs_highbit32(b)
70#endif
71
72
73#ifdef __KERNEL__
74
75#ifdef CONFIG_XFS_RT
76/*
77 * Function prototypes for exported functions.
78 */
79
80/*
81 * Allocate an extent in the realtime subvolume, with the usual allocation
82 * parameters. The length units are all in realtime extents, as is the
83 * result block number.
84 */
85int /* error */
86xfs_rtallocate_extent(
87 struct xfs_trans *tp, /* transaction pointer */
88 xfs_rtblock_t bno, /* starting block number to allocate */
89 xfs_extlen_t minlen, /* minimum length to allocate */
90 xfs_extlen_t maxlen, /* maximum length to allocate */
91 xfs_extlen_t *len, /* out: actual length allocated */
92 xfs_alloctype_t type, /* allocation type XFS_ALLOCTYPE... */
93 int wasdel, /* was a delayed allocation extent */
94 xfs_extlen_t prod, /* extent product factor */
95 xfs_rtblock_t *rtblock); /* out: start block allocated */
96
97/*
98 * Free an extent in the realtime subvolume. Length is expressed in
99 * realtime extents, as is the block number.
100 */
101int /* error */
102xfs_rtfree_extent(
103 struct xfs_trans *tp, /* transaction pointer */
104 xfs_rtblock_t bno, /* starting block number to free */
105 xfs_extlen_t len); /* length of extent freed */
106
107/*
108 * Initialize realtime fields in the mount structure.
109 */
110int /* error */
111xfs_rtmount_init(
112 struct xfs_mount *mp); /* file system mount structure */
113
114/*
115 * Get the bitmap and summary inodes into the mount structure
116 * at mount time.
117 */
118int /* error */
119xfs_rtmount_inodes(
120 struct xfs_mount *mp); /* file system mount structure */
121
122/*
123 * Pick an extent for allocation at the start of a new realtime file.
124 * Use the sequence number stored in the atime field of the bitmap inode.
125 * Translate this to a fraction of the rtextents, and return the product
126 * of rtextents and the fraction.
127 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
128 */
129int /* error */
130xfs_rtpick_extent(
131 struct xfs_mount *mp, /* file system mount point */
132 struct xfs_trans *tp, /* transaction pointer */
133 xfs_extlen_t len, /* allocation length (rtextents) */
134 xfs_rtblock_t *pick); /* result rt extent */
135
136/*
137 * Debug code: print out the value of a range in the bitmap.
138 */
139void
140xfs_rtprint_range(
141 struct xfs_mount *mp, /* file system mount structure */
142 struct xfs_trans *tp, /* transaction pointer */
143 xfs_rtblock_t start, /* starting block to print */
144 xfs_extlen_t len); /* length to print */
145
146/*
147 * Debug code: print the summary file.
148 */
149void
150xfs_rtprint_summary(
151 struct xfs_mount *mp, /* file system mount structure */
152 struct xfs_trans *tp); /* transaction pointer */
153
154/*
155 * Grow the realtime area of the filesystem.
156 */
157int
158xfs_growfs_rt(
159 struct xfs_mount *mp, /* file system mount structure */
160 xfs_growfs_rt_t *in); /* user supplied growfs struct */
161
162#else
163# define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb) (ENOSYS)
164# define xfs_rtfree_extent(t,b,l) (ENOSYS)
165# define xfs_rtpick_extent(m,t,l,rb) (ENOSYS)
166# define xfs_growfs_rt(mp,in) (ENOSYS)
167# define xfs_rtmount_init(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
168# define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
169#endif /* CONFIG_XFS_RT */
170
171#endif /* __KERNEL__ */
172
173#endif /* __XFS_RTALLOC_H__ */