2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * 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.
14 * 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
18 #ifndef __XFS_RTALLOC_H__
19 #define __XFS_RTALLOC_H__
24 /* Min and max rt extent sizes, specified in bytes */
25 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
26 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */
27 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */
30 * Constants for bit manipulations.
32 #define XFS_NBBYLOG 3 /* log2(NBBY) */
33 #define XFS_WORDLOG 2 /* log2(sizeof(xfs_rtword_t)) */
34 #define XFS_NBWORDLOG (XFS_NBBYLOG + XFS_WORDLOG)
35 #define XFS_NBWORD (1 << XFS_NBWORDLOG)
36 #define XFS_WORDMASK ((1 << XFS_WORDLOG) - 1)
38 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
39 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
40 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize)
41 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask)
44 * Summary and bit manipulation macros.
46 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
47 #define XFS_SUMOFFSTOBLOCK(mp,s) \
48 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
49 #define XFS_SUMPTR(mp,bp,so) \
50 ((xfs_suminfo_t *)((bp)->b_addr + \
51 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
53 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log)
54 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log)
55 #define XFS_BITTOWORD(mp,bi) \
56 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
58 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
59 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))
61 #define XFS_RTLOBIT(w) xfs_lowbit32(w)
62 #define XFS_RTHIBIT(w) xfs_highbit32(w)
65 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
67 #define XFS_RTBLOCKLOG(b) xfs_highbit32(b)
75 * Function prototypes for exported functions.
79 * Allocate an extent in the realtime subvolume, with the usual allocation
80 * parameters. The length units are all in realtime extents, as is the
81 * result block number.
84 xfs_rtallocate_extent(
85 struct xfs_trans
*tp
, /* transaction pointer */
86 xfs_rtblock_t bno
, /* starting block number to allocate */
87 xfs_extlen_t minlen
, /* minimum length to allocate */
88 xfs_extlen_t maxlen
, /* maximum length to allocate */
89 xfs_extlen_t
*len
, /* out: actual length allocated */
90 xfs_alloctype_t type
, /* allocation type XFS_ALLOCTYPE... */
91 int wasdel
, /* was a delayed allocation extent */
92 xfs_extlen_t prod
, /* extent product factor */
93 xfs_rtblock_t
*rtblock
); /* out: start block allocated */
96 * Free an extent in the realtime subvolume. Length is expressed in
97 * realtime extents, as is the block number.
101 struct xfs_trans
*tp
, /* transaction pointer */
102 xfs_rtblock_t bno
, /* starting block number to free */
103 xfs_extlen_t len
); /* length of extent freed */
106 * Initialize realtime fields in the mount structure.
110 struct xfs_mount
*mp
); /* file system mount structure */
112 xfs_rtunmount_inodes(
113 struct xfs_mount
*mp
);
116 * Get the bitmap and summary inodes into the mount structure
121 struct xfs_mount
*mp
); /* file system mount structure */
124 * Pick an extent for allocation at the start of a new realtime file.
125 * Use the sequence number stored in the atime field of the bitmap inode.
126 * Translate this to a fraction of the rtextents, and return the product
127 * of rtextents and the fraction.
128 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
132 struct xfs_mount
*mp
, /* file system mount point */
133 struct xfs_trans
*tp
, /* transaction pointer */
134 xfs_extlen_t len
, /* allocation length (rtextents) */
135 xfs_rtblock_t
*pick
); /* result rt extent */
138 * Grow the realtime area of the filesystem.
142 struct xfs_mount
*mp
, /* file system mount structure */
143 xfs_growfs_rt_t
*in
); /* user supplied growfs struct */
146 # define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb) (ENOSYS)
147 # define xfs_rtfree_extent(t,b,l) (ENOSYS)
148 # define xfs_rtpick_extent(m,t,l,rb) (ENOSYS)
149 # define xfs_growfs_rt(mp,in) (ENOSYS)
150 static inline int /* error */
152 xfs_mount_t
*mp
) /* file system mount structure */
154 if (mp
->m_sb
.sb_rblocks
== 0)
157 xfs_warn(mp
, "Not built with CONFIG_XFS_RT");
160 # define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
161 # define xfs_rtunmount_inodes(m)
162 #endif /* CONFIG_XFS_RT */
164 #endif /* __KERNEL__ */
166 #endif /* __XFS_RTALLOC_H__ */
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