1/* 2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 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. 8 * 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. 13 * 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 17 */ 18#ifndef __XFS_RTALLOC_H__ 19#define __XFS_RTALLOC_H__ 20 21struct xfs_mount; 22struct 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 */ 85int /* error */ 86xfs_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 */ 101int /* error */ 102xfs_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 */ 110int /* error */ 111xfs_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 */ 118int /* error */ 119xfs_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 */ 129int /* error */ 130xfs_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 */ 135 136/* 137 * Grow the realtime area of the filesystem. 138 */ 139int 140xfs_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__ */ 156