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