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 21 struct xfs_mount; 22 struct xfs_trans; 23 24 /* Min and max rt extent sizes, specified in bytes */ 25 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 26 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 27 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 28 29 /* 30 * Constants for bit manipulations. 31 */ 32 #define XFS_NBBYLOG 3 /* log2(NBBY) */ 33 #define XFS_WORDLOG 2 /* log2(sizeof(xfs_rtword_t)) */ 34 #define XFS_NBWORDLOG (XFS_NBBYLOG + XFS_WORDLOG) 35 #define XFS_NBWORD (1 << XFS_NBWORDLOG) 36 #define XFS_WORDMASK ((1 << XFS_WORDLOG) - 1) 37 38 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 39 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 40 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 41 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 42 43 /* 44 * Summary and bit manipulation macros. 45 */ 46 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 47 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 48 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 49 #define XFS_SUMPTR(mp,bp,so) \ 50 ((xfs_suminfo_t *)((char *)XFS_BUF_PTR(bp) + \ 51 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 52 53 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 54 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 55 #define XFS_BITTOWORD(mp,bi) \ 56 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 57 58 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 59 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 60 61 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 62 #define XFS_RTHIBIT(w) xfs_highbit32(w) 63 64 #if XFS_BIG_BLKNOS 65 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 66 #else 67 #define XFS_RTBLOCKLOG(b) xfs_highbit32(b) 68 #endif 69 70 71 #ifdef __KERNEL__ 72 73 #ifdef CONFIG_XFS_RT 74 /* 75 * Function prototypes for exported functions. 76 */ 77 78 /* 79 * Allocate an extent in the realtime subvolume, with the usual allocation 80 * parameters. The length units are all in realtime extents, as is the 81 * result block number. 82 */ 83 int /* error */ 84 xfs_rtallocate_extent( 85 struct xfs_trans *tp, /* transaction pointer */ 86 xfs_rtblock_t bno, /* starting block number to allocate */ 87 xfs_extlen_t minlen, /* minimum length to allocate */ 88 xfs_extlen_t maxlen, /* maximum length to allocate */ 89 xfs_extlen_t *len, /* out: actual length allocated */ 90 xfs_alloctype_t type, /* allocation type XFS_ALLOCTYPE... */ 91 int wasdel, /* was a delayed allocation extent */ 92 xfs_extlen_t prod, /* extent product factor */ 93 xfs_rtblock_t *rtblock); /* out: start block allocated */ 94 95 /* 96 * Free an extent in the realtime subvolume. Length is expressed in 97 * realtime extents, as is the block number. 98 */ 99 int /* error */ 100 xfs_rtfree_extent( 101 struct xfs_trans *tp, /* transaction pointer */ 102 xfs_rtblock_t bno, /* starting block number to free */ 103 xfs_extlen_t len); /* length of extent freed */ 104 105 /* 106 * Initialize realtime fields in the mount structure. 107 */ 108 int /* error */ 109 xfs_rtmount_init( 110 struct xfs_mount *mp); /* file system mount structure */ 111 void 112 xfs_rtunmount_inodes( 113 struct xfs_mount *mp); 114 115 /* 116 * Get the bitmap and summary inodes into the mount structure 117 * at mount time. 118 */ 119 int /* error */ 120 xfs_rtmount_inodes( 121 struct xfs_mount *mp); /* file system mount structure */ 122 123 /* 124 * Pick an extent for allocation at the start of a new realtime file. 125 * Use the sequence number stored in the atime field of the bitmap inode. 126 * Translate this to a fraction of the rtextents, and return the product 127 * of rtextents and the fraction. 128 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ... 129 */ 130 int /* error */ 131 xfs_rtpick_extent( 132 struct xfs_mount *mp, /* file system mount point */ 133 struct xfs_trans *tp, /* transaction pointer */ 134 xfs_extlen_t len, /* allocation length (rtextents) */ 135 xfs_rtblock_t *pick); /* result rt extent */ 136 137 /* 138 * Grow the realtime area of the filesystem. 139 */ 140 int 141 xfs_growfs_rt( 142 struct xfs_mount *mp, /* file system mount structure */ 143 xfs_growfs_rt_t *in); /* user supplied growfs struct */ 144 145 #else 146 # define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb) (ENOSYS) 147 # define xfs_rtfree_extent(t,b,l) (ENOSYS) 148 # define xfs_rtpick_extent(m,t,l,rb) (ENOSYS) 149 # define xfs_growfs_rt(mp,in) (ENOSYS) 150 static inline int /* error */ 151 xfs_rtmount_init( 152 xfs_mount_t *mp) /* file system mount structure */ 153 { 154 if (mp->m_sb.sb_rblocks == 0) 155 return 0; 156 157 cmn_err(CE_WARN, "XFS: Not built with CONFIG_XFS_RT"); 158 return ENOSYS; 159 } 160 # define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS)) 161 # define xfs_rtunmount_inodes(m) 162 #endif /* CONFIG_XFS_RT */ 163 164 #endif /* __KERNEL__ */ 165 166 #endif /* __XFS_RTALLOC_H__ */ 167