561f7d1739
xfs_btree_init_cursor contains close to little shared code for the different btrees and will get even more non-common code in the future. Split it up into one routine per btree type. Because xfs_btree_dup_cursor needs to call the init routine for a generic btree cursor add a new btree operation vector that contains a dup_cursor method that initializes a new cursor based on an existing one. The btree operations vector is based on an idea and code from Dave Chinner and will grow more entries later during this series. SGI-PV: 985583 SGI-Modid: xfs-linux-melb:xfs-kern:32176a 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>
160 lines
5.2 KiB
C
160 lines
5.2 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_ALLOC_BTREE_H__
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#define __XFS_ALLOC_BTREE_H__
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/*
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* Freespace 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 are two on-disk btrees, one sorted by blockno and one sorted
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* by blockcount and blockno. All blocks look the same to make the code
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* simpler; if we have time later, we'll make the optimizations.
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*/
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#define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
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#define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
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/*
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* Data record/key structure
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*/
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typedef struct xfs_alloc_rec {
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__be32 ar_startblock; /* starting block number */
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__be32 ar_blockcount; /* count of free blocks */
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} xfs_alloc_rec_t, xfs_alloc_key_t;
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typedef struct xfs_alloc_rec_incore {
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xfs_agblock_t ar_startblock; /* starting block number */
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xfs_extlen_t ar_blockcount; /* count of free blocks */
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} xfs_alloc_rec_incore_t;
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/* btree pointer type */
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typedef __be32 xfs_alloc_ptr_t;
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/* btree block header type */
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typedef struct xfs_btree_sblock xfs_alloc_block_t;
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#define XFS_BUF_TO_ALLOC_BLOCK(bp) ((xfs_alloc_block_t *)XFS_BUF_PTR(bp))
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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_ALLOC_BLOCK_MAXRECS(lev,cur) ((cur)->bc_mp->m_alloc_mxr[lev != 0])
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#define XFS_ALLOC_BLOCK_MINRECS(lev,cur) ((cur)->bc_mp->m_alloc_mnr[lev != 0])
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/*
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* Minimum and maximum blocksize and sectorsize.
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* The blocksize upper limit is pretty much arbitrary.
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* The sectorsize upper limit is due to sizeof(sb_sectsize).
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*/
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#define XFS_MIN_BLOCKSIZE_LOG 9 /* i.e. 512 bytes */
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#define XFS_MAX_BLOCKSIZE_LOG 16 /* i.e. 65536 bytes */
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#define XFS_MIN_BLOCKSIZE (1 << XFS_MIN_BLOCKSIZE_LOG)
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#define XFS_MAX_BLOCKSIZE (1 << XFS_MAX_BLOCKSIZE_LOG)
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#define XFS_MIN_SECTORSIZE_LOG 9 /* i.e. 512 bytes */
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#define XFS_MAX_SECTORSIZE_LOG 15 /* i.e. 32768 bytes */
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#define XFS_MIN_SECTORSIZE (1 << XFS_MIN_SECTORSIZE_LOG)
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#define XFS_MAX_SECTORSIZE (1 << XFS_MAX_SECTORSIZE_LOG)
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/*
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* Block numbers in the AG:
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* SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
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*/
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#define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
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#define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_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_ALLOC_REC_ADDR(bb,i,cur) \
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XFS_BTREE_REC_ADDR(xfs_alloc, bb, i)
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#define XFS_ALLOC_KEY_ADDR(bb,i,cur) \
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XFS_BTREE_KEY_ADDR(xfs_alloc, bb, i)
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#define XFS_ALLOC_PTR_ADDR(bb,i,cur) \
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XFS_BTREE_PTR_ADDR(xfs_alloc, bb, i, XFS_ALLOC_BLOCK_MAXRECS(1, cur))
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/*
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* Decrement cursor by one record at the level.
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* For nonzero levels the leaf-ward information is untouched.
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*/
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extern int xfs_alloc_decrement(struct xfs_btree_cur *cur, int level, int *stat);
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/*
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* Delete the record pointed to by cur.
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* The cursor refers to the place where the record was (could be inserted)
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* when the operation returns.
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*/
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extern int xfs_alloc_delete(struct xfs_btree_cur *cur, int *stat);
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/*
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* Get the data from the pointed-to record.
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*/
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extern int xfs_alloc_get_rec(struct xfs_btree_cur *cur, xfs_agblock_t *bno,
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xfs_extlen_t *len, int *stat);
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/*
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* Increment cursor by one record at the level.
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* For nonzero levels the leaf-ward information is untouched.
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*/
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extern int xfs_alloc_increment(struct xfs_btree_cur *cur, int level, int *stat);
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/*
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* Insert the current record at the point referenced by cur.
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* The cursor may be inconsistent on return if splits have been done.
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*/
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extern int xfs_alloc_insert(struct xfs_btree_cur *cur, int *stat);
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/*
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* Lookup the record equal to [bno, len] in the btree given by cur.
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*/
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extern int xfs_alloc_lookup_eq(struct xfs_btree_cur *cur, xfs_agblock_t bno,
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xfs_extlen_t len, int *stat);
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/*
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* Lookup the first record greater than or equal to [bno, len]
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* in the btree given by cur.
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*/
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extern int xfs_alloc_lookup_ge(struct xfs_btree_cur *cur, xfs_agblock_t bno,
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xfs_extlen_t len, int *stat);
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/*
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* Lookup the first record less than or equal to [bno, len]
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* in the btree given by cur.
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*/
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extern int xfs_alloc_lookup_le(struct xfs_btree_cur *cur, xfs_agblock_t bno,
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xfs_extlen_t len, int *stat);
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/*
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* Update the record referred to by cur, to the value given by [bno, len].
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* This either works (return 0) or gets an EFSCORRUPTED error.
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*/
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extern int xfs_alloc_update(struct xfs_btree_cur *cur, xfs_agblock_t bno,
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xfs_extlen_t len);
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extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *,
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struct xfs_trans *, struct xfs_buf *,
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xfs_agnumber_t, xfs_btnum_t);
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#endif /* __XFS_ALLOC_BTREE_H__ */
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