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Diffstat (limited to 'fs/xfs/xfs_alloc_btree.h')
| -rw-r--r-- | fs/xfs/xfs_alloc_btree.h | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/fs/xfs/xfs_alloc_btree.h b/fs/xfs/xfs_alloc_btree.h new file mode 100644 index 0000000..ed5161a --- /dev/null +++ b/fs/xfs/xfs_alloc_btree.h @@ -0,0 +1,257 @@ +/* + * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * Further, this software is distributed without any warranty that it is + * free of the rightful claim of any third person regarding infringement + * or the like. Any license provided herein, whether implied or + * otherwise, applies only to this software file. Patent licenses, if + * any, provided herein do not apply to combinations of this program with + * other software, or any other product whatsoever. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, + * Mountain View, CA 94043, or: + * + * http://www.sgi.com + * + * For further information regarding this notice, see: + * + * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ + */ +#ifndef __XFS_ALLOC_BTREE_H__ +#define __XFS_ALLOC_BTREE_H__ + +/* + * Freespace on-disk structures + */ + +struct xfs_buf; +struct xfs_btree_cur; +struct xfs_btree_sblock; +struct xfs_mount; + +/* + * There are two on-disk btrees, one sorted by blockno and one sorted + * by blockcount and blockno. All blocks look the same to make the code + * simpler; if we have time later, we'll make the optimizations. + */ +#define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ +#define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ + +/* + * Data record/key structure + */ +typedef struct xfs_alloc_rec +{ + xfs_agblock_t ar_startblock; /* starting block number */ + xfs_extlen_t ar_blockcount; /* count of free blocks */ +} xfs_alloc_rec_t, xfs_alloc_key_t; + +typedef xfs_agblock_t xfs_alloc_ptr_t; /* btree pointer type */ + /* btree block header type */ +typedef struct xfs_btree_sblock xfs_alloc_block_t; + +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BUF_TO_ALLOC_BLOCK) +xfs_alloc_block_t *xfs_buf_to_alloc_block(struct xfs_buf *bp); +#define XFS_BUF_TO_ALLOC_BLOCK(bp) xfs_buf_to_alloc_block(bp) +#else +#define XFS_BUF_TO_ALLOC_BLOCK(bp) ((xfs_alloc_block_t *)(XFS_BUF_PTR(bp))) +#endif + +/* + * Real block structures have a size equal to the disk block size. + */ + +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_BLOCK_SIZE) +int xfs_alloc_block_size(int lev, struct xfs_btree_cur *cur); +#define XFS_ALLOC_BLOCK_SIZE(lev,cur) xfs_alloc_block_size(lev,cur) +#else +#define XFS_ALLOC_BLOCK_SIZE(lev,cur) (1 << (cur)->bc_blocklog) +#endif + +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_BLOCK_MAXRECS) +int xfs_alloc_block_maxrecs(int lev, struct xfs_btree_cur *cur); +#define XFS_ALLOC_BLOCK_MAXRECS(lev,cur) xfs_alloc_block_maxrecs(lev,cur) +#else +#define XFS_ALLOC_BLOCK_MAXRECS(lev,cur) \ + ((cur)->bc_mp->m_alloc_mxr[lev != 0]) +#endif +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_BLOCK_MINRECS) +int xfs_alloc_block_minrecs(int lev, struct xfs_btree_cur *cur); +#define XFS_ALLOC_BLOCK_MINRECS(lev,cur) xfs_alloc_block_minrecs(lev,cur) +#else +#define XFS_ALLOC_BLOCK_MINRECS(lev,cur) \ + ((cur)->bc_mp->m_alloc_mnr[lev != 0]) +#endif + +/* + * Minimum and maximum blocksize and sectorsize. + * The blocksize upper limit is pretty much arbitrary. + * The sectorsize upper limit is due to sizeof(sb_sectsize). + */ +#define XFS_MIN_BLOCKSIZE_LOG 9 /* i.e. 512 bytes */ +#define XFS_MAX_BLOCKSIZE_LOG 16 /* i.e. 65536 bytes */ +#define XFS_MIN_BLOCKSIZE (1 << XFS_MIN_BLOCKSIZE_LOG) +#define XFS_MAX_BLOCKSIZE (1 << XFS_MAX_BLOCKSIZE_LOG) +#define XFS_MIN_SECTORSIZE_LOG 9 /* i.e. 512 bytes */ +#define XFS_MAX_SECTORSIZE_LOG 15 /* i.e. 32768 bytes */ +#define XFS_MIN_SECTORSIZE (1 << XFS_MIN_SECTORSIZE_LOG) +#define XFS_MAX_SECTORSIZE (1 << XFS_MAX_SECTORSIZE_LOG) + +/* + * Block numbers in the AG: + * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BNO_BLOCK) +xfs_agblock_t xfs_bno_block(struct xfs_mount *mp); +#define XFS_BNO_BLOCK(mp) xfs_bno_block(mp) +#else +#define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) +#endif +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_CNT_BLOCK) +xfs_agblock_t xfs_cnt_block(struct xfs_mount *mp); +#define XFS_CNT_BLOCK(mp) xfs_cnt_block(mp) +#else +#define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) +#endif + +/* + * Record, key, and pointer address macros for btree blocks. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_REC_ADDR) +xfs_alloc_rec_t *xfs_alloc_rec_addr(xfs_alloc_block_t *bb, int i, + struct xfs_btree_cur *cur); +#define XFS_ALLOC_REC_ADDR(bb,i,cur) xfs_alloc_rec_addr(bb,i,cur) +#else +#define XFS_ALLOC_REC_ADDR(bb,i,cur) \ + XFS_BTREE_REC_ADDR(XFS_ALLOC_BLOCK_SIZE(0,cur), xfs_alloc, bb, i, \ + XFS_ALLOC_BLOCK_MAXRECS(0, cur)) +#endif + +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_KEY_ADDR) +xfs_alloc_key_t *xfs_alloc_key_addr(xfs_alloc_block_t *bb, int i, + struct xfs_btree_cur *cur); +#define XFS_ALLOC_KEY_ADDR(bb,i,cur) xfs_alloc_key_addr(bb,i,cur) +#else +#define XFS_ALLOC_KEY_ADDR(bb,i,cur) \ + XFS_BTREE_KEY_ADDR(XFS_ALLOC_BLOCK_SIZE(1,cur), xfs_alloc, bb, i, \ + XFS_ALLOC_BLOCK_MAXRECS(1, cur)) +#endif + +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ALLOC_PTR_ADDR) +xfs_alloc_ptr_t *xfs_alloc_ptr_addr(xfs_alloc_block_t *bb, int i, + struct xfs_btree_cur *cur); +#define XFS_ALLOC_PTR_ADDR(bb,i,cur) xfs_alloc_ptr_addr(bb,i,cur) +#else +#define XFS_ALLOC_PTR_ADDR(bb,i,cur) \ + XFS_BTREE_PTR_ADDR(XFS_ALLOC_BLOCK_SIZE(1,cur), xfs_alloc, bb, i, \ + XFS_ALLOC_BLOCK_MAXRECS(1, cur)) +#endif + +/* + * Prototypes for externally visible routines. + */ + +/* + * Decrement cursor by one record at the level. + * For nonzero levels the leaf-ward information is untouched. + */ +int /* error */ +xfs_alloc_decrement( + struct xfs_btree_cur *cur, /* btree cursor */ + int level, /* level in btree, 0 is leaf */ + int *stat); /* success/failure */ + +/* + * Delete the record pointed to by cur. + * The cursor refers to the place where the record was (could be inserted) + * when the operation returns. + */ +int /* error */ +xfs_alloc_delete( + struct xfs_btree_cur *cur, /* btree cursor */ + int *stat); /* success/failure */ + +/* + * Get the data from the pointed-to record. + */ +int /* error */ +xfs_alloc_get_rec( + struct xfs_btree_cur *cur, /* btree cursor */ + xfs_agblock_t *bno, /* output: starting block of extent */ + xfs_extlen_t *len, /* output: length of extent */ + int *stat); /* output: success/failure */ + +/* + * Increment cursor by one record at the level. + * For nonzero levels the leaf-ward information is untouched. + */ +int /* error */ +xfs_alloc_increment( + struct xfs_btree_cur *cur, /* btree cursor */ + int level, /* level in btree, 0 is leaf */ + int *stat); /* success/failure */ + +/* + * Insert the current record at the point referenced by cur. + * The cursor may be inconsistent on return if splits have been done. + */ +int /* error */ +xfs_alloc_insert( + struct xfs_btree_cur *cur, /* btree cursor */ + int *stat); /* success/failure */ + +/* + * Lookup the record equal to [bno, len] in the btree given by cur. + */ +int /* error */ +xfs_alloc_lookup_eq( + struct xfs_btree_cur *cur, /* btree cursor */ + xfs_agblock_t bno, /* starting block of extent */ + xfs_extlen_t len, /* length of extent */ + int *stat); /* success/failure */ + +/* + * Lookup the first record greater than or equal to [bno, len] + * in the btree given by cur. + */ +int /* error */ +xfs_alloc_lookup_ge( + struct xfs_btree_cur *cur, /* btree cursor */ + xfs_agblock_t bno, /* starting block of extent */ + xfs_extlen_t len, /* length of extent */ + int *stat); /* success/failure */ + +/* + * Lookup the first record less than or equal to [bno, len] + * in the btree given by cur. + */ +int /* error */ +xfs_alloc_lookup_le( + struct xfs_btree_cur *cur, /* btree cursor */ + xfs_agblock_t bno, /* starting block of extent */ + xfs_extlen_t len, /* length of extent */ + int *stat); /* success/failure */ + +/* + * Update the record referred to by cur, to the value given by [bno, len]. + * This either works (return 0) or gets an EFSCORRUPTED error. + */ +int /* error */ +xfs_alloc_update( + struct xfs_btree_cur *cur, /* btree cursor */ + xfs_agblock_t bno, /* starting block of extent */ + xfs_extlen_t len); /* length of extent */ + +#endif /* __XFS_ALLOC_BTREE_H__ */ |
