forked from Minki/linux
035e00acb5
Originally-From: Dave Chinner <dchinner@redhat.com> Now we have all the surrounding call infrastructure in place, we can start filling out the rmap btree implementation. Start with the on-disk btree format; add everything needed to read, write and manipulate rmap btree blocks. This prepares the way for adding the btree operations implementation. [darrick: record owner and offset info in rmap btree] [darrick: fork, bmbt and unwritten state in rmap btree] [darrick: flags are a separate field in xfs_rmap_irec] [darrick: calculate maxlevels separately] [darrick: move the 'unwritten' bit into unused parts of rm_offset] Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/*
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* Copyright (c) 2014 Red Hat, 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_RMAP_BTREE_H__
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#define __XFS_RMAP_BTREE_H__
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struct xfs_buf;
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struct xfs_btree_cur;
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struct xfs_mount;
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/* rmaps only exist on crc enabled filesystems */
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#define XFS_RMAP_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN
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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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* (note that some of these may appear unused, but they are used in userspace)
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*/
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#define XFS_RMAP_REC_ADDR(block, index) \
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((struct xfs_rmap_rec *) \
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((char *)(block) + XFS_RMAP_BLOCK_LEN + \
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(((index) - 1) * sizeof(struct xfs_rmap_rec))))
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#define XFS_RMAP_KEY_ADDR(block, index) \
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((struct xfs_rmap_key *) \
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((char *)(block) + XFS_RMAP_BLOCK_LEN + \
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((index) - 1) * sizeof(struct xfs_rmap_key)))
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#define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \
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((xfs_rmap_ptr_t *) \
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((char *)(block) + XFS_RMAP_BLOCK_LEN + \
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(maxrecs) * sizeof(struct xfs_rmap_key) + \
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((index) - 1) * sizeof(xfs_rmap_ptr_t)))
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struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp,
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struct xfs_trans *tp, struct xfs_buf *bp,
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xfs_agnumber_t agno);
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int xfs_rmapbt_maxrecs(struct xfs_mount *mp, int blocklen, int leaf);
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extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp);
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#endif /* __XFS_RMAP_BTREE_H__ */
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