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Diffstat (limited to 'fs/xfs/xfs_rtalloc.h')
-rw-r--r-- | fs/xfs/xfs_rtalloc.h | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/fs/xfs/xfs_rtalloc.h b/fs/xfs/xfs_rtalloc.h new file mode 100644 index 000000000000..e2710264c054 --- /dev/null +++ b/fs/xfs/xfs_rtalloc.h | |||
@@ -0,0 +1,187 @@ | |||
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__ */ | ||