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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__ */ |