8cc938fe42
Not really much reason to make it generic given that it's so small, but this is the last non-method in xfs_alloc_btree.c and xfs_ialloc_btree.c, so it makes the whole btree implementation more structured. SGI-PV: 985583 SGI-Modid: xfs-linux-melb:xfs-kern:32206a Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: Bill O'Donnell <billodo@sgi.com> Signed-off-by: David Chinner <david@fromorbit.com>
123 lines
3.6 KiB
C
123 lines
3.6 KiB
C
/*
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* Copyright (c) 2000,2005 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_IALLOC_BTREE_H__
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#define __XFS_IALLOC_BTREE_H__
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/*
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* Inode map on-disk structures
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*/
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struct xfs_buf;
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struct xfs_btree_cur;
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struct xfs_btree_sblock;
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struct xfs_mount;
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/*
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* There is a btree for the inode map per allocation group.
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*/
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#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
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typedef __uint64_t xfs_inofree_t;
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#define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
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#define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
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#define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
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#define XFS_INOBT_MASKN(i,n) xfs_inobt_maskn(i,n)
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static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
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{
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return (((n) >= XFS_INODES_PER_CHUNK ? \
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(xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i);
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}
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/*
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* Data record structure
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*/
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typedef struct xfs_inobt_rec {
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__be32 ir_startino; /* starting inode number */
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__be32 ir_freecount; /* count of free inodes (set bits) */
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__be64 ir_free; /* free inode mask */
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} xfs_inobt_rec_t;
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typedef struct xfs_inobt_rec_incore {
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xfs_agino_t ir_startino; /* starting inode number */
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__int32_t ir_freecount; /* count of free inodes (set bits) */
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xfs_inofree_t ir_free; /* free inode mask */
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} xfs_inobt_rec_incore_t;
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/*
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* Key structure
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*/
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typedef struct xfs_inobt_key {
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__be32 ir_startino; /* starting inode number */
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} xfs_inobt_key_t;
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/* btree pointer type */
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typedef __be32 xfs_inobt_ptr_t;
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/* btree block header type */
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typedef struct xfs_btree_sblock xfs_inobt_block_t;
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#define XFS_BUF_TO_INOBT_BLOCK(bp) ((xfs_inobt_block_t *)XFS_BUF_PTR(bp))
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/*
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* Bit manipulations for ir_free.
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*/
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#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
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#define XFS_INOBT_IS_FREE(rp,i) \
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(((rp)->ir_free & XFS_INOBT_MASK(i)) != 0)
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#define XFS_INOBT_SET_FREE(rp,i) ((rp)->ir_free |= XFS_INOBT_MASK(i))
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#define XFS_INOBT_CLR_FREE(rp,i) ((rp)->ir_free &= ~XFS_INOBT_MASK(i))
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/*
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* Real block structures have a size equal to the disk block size.
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*/
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#define XFS_INOBT_BLOCK_MAXRECS(lev,cur) ((cur)->bc_mp->m_inobt_mxr[lev != 0])
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#define XFS_INOBT_BLOCK_MINRECS(lev,cur) ((cur)->bc_mp->m_inobt_mnr[lev != 0])
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#define XFS_INOBT_IS_LAST_REC(cur) \
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((cur)->bc_ptrs[0] == be16_to_cpu(XFS_BUF_TO_INOBT_BLOCK((cur)->bc_bufs[0])->bb_numrecs))
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/*
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* Maximum number of inode btree levels.
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*/
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#define XFS_IN_MAXLEVELS(mp) ((mp)->m_in_maxlevels)
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/*
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* block numbers in the AG.
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*/
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#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
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#define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
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/*
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* Record, key, and pointer address macros for btree blocks.
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*/
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#define XFS_INOBT_REC_ADDR(bb,i,cur) \
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(XFS_BTREE_REC_ADDR(xfs_inobt, bb, i))
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#define XFS_INOBT_KEY_ADDR(bb,i,cur) \
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(XFS_BTREE_KEY_ADDR(xfs_inobt, bb, i))
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#define XFS_INOBT_PTR_ADDR(bb,i,cur) \
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(XFS_BTREE_PTR_ADDR(xfs_inobt, bb, \
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i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))
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extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
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struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t);
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#endif /* __XFS_IALLOC_BTREE_H__ */
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