Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 LT |
17 | */ |
18 | #ifndef __XFS_RTALLOC_H__ | |
19 | #define __XFS_RTALLOC_H__ | |
20 | ||
21 | struct xfs_mount; | |
22 | struct 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 | */ | |
85 | int /* error */ | |
86 | xfs_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 | */ | |
101 | int /* error */ | |
102 | xfs_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 | */ | |
110 | int /* error */ | |
111 | xfs_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 | */ | |
118 | int /* error */ | |
119 | xfs_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 | */ | |
129 | int /* error */ | |
130 | xfs_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 | ||
1da177e4 LT |
136 | /* |
137 | * Grow the realtime area of the filesystem. | |
138 | */ | |
139 | int | |
140 | xfs_growfs_rt( | |
141 | struct xfs_mount *mp, /* file system mount structure */ | |
142 | xfs_growfs_rt_t *in); /* user supplied growfs struct */ | |
143 | ||
144 | #else | |
145 | # define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb) (ENOSYS) | |
146 | # define xfs_rtfree_extent(t,b,l) (ENOSYS) | |
147 | # define xfs_rtpick_extent(m,t,l,rb) (ENOSYS) | |
148 | # define xfs_growfs_rt(mp,in) (ENOSYS) | |
149 | # define xfs_rtmount_init(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS)) | |
150 | # define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS)) | |
151 | #endif /* CONFIG_XFS_RT */ | |
152 | ||
153 | #endif /* __KERNEL__ */ | |
154 | ||
155 | #endif /* __XFS_RTALLOC_H__ */ |