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/* * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __XFS_RTALLOC_H__ #define __XFS_RTALLOC_H__ struct xfs_mount; struct xfs_trans; #define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) /* Min and max rt extent sizes, specified in bytes */ #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64KB */ #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4KB */ /* * Constants for bit manipulations. */ #define XFS_NBBYLOG 3 /* log2(NBBY) */ #define XFS_WORDLOG 2 /* log2(sizeof(xfs_rtword_t)) */ #define XFS_NBWORDLOG (XFS_NBBYLOG + XFS_WORDLOG) #define XFS_NBWORD (1 << XFS_NBWORDLOG) #define XFS_WORDMASK ((1 << XFS_WORDLOG) - 1) #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) /* * Summary and bit manipulation macros. */ #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) #define XFS_SUMOFFSTOBLOCK(mp,s) \ (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) #define XFS_SUMPTR(mp,bp,so) \ ((xfs_suminfo_t *)((char *)XFS_BUF_PTR(bp) + \ (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) #define XFS_BITTOWORD(mp,bi) \ ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) #define XFS_RTLOBIT(w) xfs_lowbit32(w) #define XFS_RTHIBIT(w) xfs_highbit32(w) #if XFS_BIG_BLKNOS #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) #else #define XFS_RTBLOCKLOG(b) xfs_highbit32(b) #endif #ifdef __KERNEL__ #ifdef CONFIG_XFS_RT /* * Function prototypes for exported functions. */ /* * Allocate an extent in the realtime subvolume, with the usual allocation * parameters. The length units are all in realtime extents, as is the * result block number. */ int /* error */ xfs_rtallocate_extent( struct xfs_trans *tp, /* transaction pointer */ xfs_rtblock_t bno, /* starting block number to allocate */ xfs_extlen_t minlen, /* minimum length to allocate */ xfs_extlen_t maxlen, /* maximum length to allocate */ xfs_extlen_t *len, /* out: actual length allocated */ xfs_alloctype_t type, /* allocation type XFS_ALLOCTYPE... */ int wasdel, /* was a delayed allocation extent */ xfs_extlen_t prod, /* extent product factor */ xfs_rtblock_t *rtblock); /* out: start block allocated */ /* * Free an extent in the realtime subvolume. Length is expressed in * realtime extents, as is the block number. */ int /* error */ xfs_rtfree_extent( struct xfs_trans *tp, /* transaction pointer */ xfs_rtblock_t bno, /* starting block number to free */ xfs_extlen_t len); /* length of extent freed */ /* * Initialize realtime fields in the mount structure. */ int /* error */ xfs_rtmount_init( struct xfs_mount *mp); /* file system mount structure */ /* * Get the bitmap and summary inodes into the mount structure * at mount time. */ int /* error */ xfs_rtmount_inodes( struct xfs_mount *mp); /* file system mount structure */ /* * Pick an extent for allocation at the start of a new realtime file. * Use the sequence number stored in the atime field of the bitmap inode. * Translate this to a fraction of the rtextents, and return the product * of rtextents and the fraction. * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ... */ int /* error */ xfs_rtpick_extent( struct xfs_mount *mp, /* file system mount point */ struct xfs_trans *tp, /* transaction pointer */ xfs_extlen_t len, /* allocation length (rtextents) */ xfs_rtblock_t *pick); /* result rt extent */ /* * Debug code: print out the value of a range in the bitmap. */ void xfs_rtprint_range( struct xfs_mount *mp, /* file system mount structure */ struct xfs_trans *tp, /* transaction pointer */ xfs_rtblock_t start, /* starting block to print */ xfs_extlen_t len); /* length to print */ /* * Debug code: print the summary file. */ void xfs_rtprint_summary( struct xfs_mount *mp, /* file system mount structure */ struct xfs_trans *tp); /* transaction pointer */ /* * Grow the realtime area of the filesystem. */ int xfs_growfs_rt( struct xfs_mount *mp, /* file system mount structure */ xfs_growfs_rt_t *in); /* user supplied growfs struct */ #else # define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb) (ENOSYS) # define xfs_rtfree_extent(t,b,l) (ENOSYS) # define xfs_rtpick_extent(m,t,l,rb) (ENOSYS) # define xfs_growfs_rt(mp,in) (ENOSYS) # define xfs_rtmount_init(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS)) # define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS)) #endif /* CONFIG_XFS_RT */ #endif /* __KERNEL__ */ #endif /* __XFS_RTALLOC_H__ */