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__ */ 188