331b6cc0ea
Improve support for writing to XFS partitions. Work done by: Russell Cattelan <cattelan at xfs dot org>
160 lines
5.3 KiB
C
160 lines
5.3 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_SIZE(lev,cur) (1 << (cur)->bc_blocklog)
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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_BLOCK_SIZE(0,cur), xfs_alloc, \
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bb, i, XFS_ALLOC_BLOCK_MAXRECS(0, cur))
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#define XFS_ALLOC_KEY_ADDR(bb,i,cur) \
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XFS_BTREE_KEY_ADDR(XFS_ALLOC_BLOCK_SIZE(1,cur), xfs_alloc, \
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bb, i, XFS_ALLOC_BLOCK_MAXRECS(1, cur))
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#define XFS_ALLOC_PTR_ADDR(bb,i,cur) \
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XFS_BTREE_PTR_ADDR(XFS_ALLOC_BLOCK_SIZE(1,cur), xfs_alloc, \
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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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#endif /* __XFS_ALLOC_BTREE_H__ */
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