mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-30 16:13:54 +08:00
16259e7d95
SGI-PV: 943272 SGI-Modid: xfs-linux:xfs-kern:201006a Signed-off-by: Christoph Hellwig <hch@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com>
160 lines
5.3 KiB
C
160 lines
5.3 KiB
C
/*
|
|
* Copyright (c) 2000,2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms 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. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#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 {
|
|
__be32 ar_startblock; /* starting block number */
|
|
__be32 ar_blockcount; /* count of free blocks */
|
|
} xfs_alloc_rec_t, xfs_alloc_key_t;
|
|
|
|
typedef struct xfs_alloc_rec_incore {
|
|
xfs_agblock_t ar_startblock; /* starting block number */
|
|
xfs_extlen_t ar_blockcount; /* count of free blocks */
|
|
} xfs_alloc_rec_incore_t;
|
|
|
|
/* btree pointer type */
|
|
typedef __be32 xfs_alloc_ptr_t;
|
|
/* btree block header type */
|
|
typedef struct xfs_btree_sblock xfs_alloc_block_t;
|
|
|
|
#define XFS_BUF_TO_ALLOC_BLOCK(bp) ((xfs_alloc_block_t *)XFS_BUF_PTR(bp))
|
|
|
|
/*
|
|
* Real block structures have a size equal to the disk block size.
|
|
*/
|
|
#define XFS_ALLOC_BLOCK_SIZE(lev,cur) (1 << (cur)->bc_blocklog)
|
|
#define XFS_ALLOC_BLOCK_MAXRECS(lev,cur) ((cur)->bc_mp->m_alloc_mxr[lev != 0])
|
|
#define XFS_ALLOC_BLOCK_MINRECS(lev,cur) ((cur)->bc_mp->m_alloc_mnr[lev != 0])
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
#define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
|
|
#define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
|
|
|
|
/*
|
|
* Record, key, and pointer address macros for btree blocks.
|
|
*/
|
|
#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))
|
|
|
|
#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))
|
|
|
|
#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))
|
|
|
|
/*
|
|
* Decrement cursor by one record at the level.
|
|
* For nonzero levels the leaf-ward information is untouched.
|
|
*/
|
|
extern int xfs_alloc_decrement(struct xfs_btree_cur *cur, int level, int *stat);
|
|
|
|
/*
|
|
* Delete the record pointed to by cur.
|
|
* The cursor refers to the place where the record was (could be inserted)
|
|
* when the operation returns.
|
|
*/
|
|
extern int xfs_alloc_delete(struct xfs_btree_cur *cur, int *stat);
|
|
|
|
/*
|
|
* Get the data from the pointed-to record.
|
|
*/
|
|
extern int xfs_alloc_get_rec(struct xfs_btree_cur *cur, xfs_agblock_t *bno,
|
|
xfs_extlen_t *len, int *stat);
|
|
|
|
/*
|
|
* Increment cursor by one record at the level.
|
|
* For nonzero levels the leaf-ward information is untouched.
|
|
*/
|
|
extern int xfs_alloc_increment(struct xfs_btree_cur *cur, int level, int *stat);
|
|
|
|
/*
|
|
* Insert the current record at the point referenced by cur.
|
|
* The cursor may be inconsistent on return if splits have been done.
|
|
*/
|
|
extern int xfs_alloc_insert(struct xfs_btree_cur *cur, int *stat);
|
|
|
|
/*
|
|
* Lookup the record equal to [bno, len] in the btree given by cur.
|
|
*/
|
|
extern int xfs_alloc_lookup_eq(struct xfs_btree_cur *cur, xfs_agblock_t bno,
|
|
xfs_extlen_t len, int *stat);
|
|
|
|
/*
|
|
* Lookup the first record greater than or equal to [bno, len]
|
|
* in the btree given by cur.
|
|
*/
|
|
extern int xfs_alloc_lookup_ge(struct xfs_btree_cur *cur, xfs_agblock_t bno,
|
|
xfs_extlen_t len, int *stat);
|
|
|
|
/*
|
|
* Lookup the first record less than or equal to [bno, len]
|
|
* in the btree given by cur.
|
|
*/
|
|
extern int xfs_alloc_lookup_le(struct xfs_btree_cur *cur, xfs_agblock_t bno,
|
|
xfs_extlen_t len, int *stat);
|
|
|
|
/*
|
|
* Update the record referred to by cur, to the value given by [bno, len].
|
|
* This either works (return 0) or gets an EFSCORRUPTED error.
|
|
*/
|
|
extern int xfs_alloc_update(struct xfs_btree_cur *cur, xfs_agblock_t bno,
|
|
xfs_extlen_t len);
|
|
|
|
#endif /* __XFS_ALLOC_BTREE_H__ */
|