250 lines
7.3 KiB
C
250 lines
7.3 KiB
C
/*
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* Copyright (c) 2000,2002-2005 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_BMAP_BTREE_H__
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#define __XFS_BMAP_BTREE_H__
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#define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
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struct xfs_btree_cur;
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struct xfs_btree_block;
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struct xfs_mount;
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struct xfs_inode;
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struct xfs_trans;
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/*
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* Bmap root header, on-disk form only.
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*/
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typedef struct xfs_bmdr_block {
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__be16 bb_level; /* 0 is a leaf */
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__be16 bb_numrecs; /* current # of data records */
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} xfs_bmdr_block_t;
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/*
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* Bmap btree record and extent descriptor.
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* l0:63 is an extent flag (value 1 indicates non-normal).
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* l0:9-62 are startoff.
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* l0:0-8 and l1:21-63 are startblock.
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* l1:0-20 are blockcount.
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*/
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#define BMBT_EXNTFLAG_BITLEN 1
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#define BMBT_STARTOFF_BITLEN 54
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#define BMBT_STARTBLOCK_BITLEN 52
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#define BMBT_BLOCKCOUNT_BITLEN 21
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#define BMBT_USE_64 1
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typedef struct xfs_bmbt_rec_32
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{
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__uint32_t l0, l1, l2, l3;
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} xfs_bmbt_rec_32_t;
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typedef struct xfs_bmbt_rec_64
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{
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__be64 l0, l1;
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} xfs_bmbt_rec_64_t;
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typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
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typedef xfs_bmbt_rec_64_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;
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typedef struct xfs_bmbt_rec_host {
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__uint64_t l0, l1;
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} xfs_bmbt_rec_host_t;
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/*
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* Values and macros for delayed-allocation startblock fields.
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*/
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#define STARTBLOCKVALBITS 17
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#define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
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#define DSTARTBLOCKMASKBITS (15 + 20)
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#define STARTBLOCKMASK \
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(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
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#define DSTARTBLOCKMASK \
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(((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
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static inline int isnullstartblock(xfs_fsblock_t x)
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{
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return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
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}
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static inline int isnulldstartblock(xfs_dfsbno_t x)
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{
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return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
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}
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static inline xfs_fsblock_t nullstartblock(int k)
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{
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ASSERT(k < (1 << STARTBLOCKVALBITS));
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return STARTBLOCKMASK | (k);
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}
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static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
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{
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return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
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}
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/*
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* Possible extent formats.
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*/
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typedef enum {
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XFS_EXTFMT_NOSTATE = 0,
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XFS_EXTFMT_HASSTATE
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} xfs_exntfmt_t;
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/*
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* Possible extent states.
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*/
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typedef enum {
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XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
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XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
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} xfs_exntst_t;
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/*
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* Extent state and extent format macros.
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*/
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#define XFS_EXTFMT_INODE(x) \
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(xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
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XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
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#define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)
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/*
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* Incore version of above.
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*/
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typedef struct xfs_bmbt_irec
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{
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xfs_fileoff_t br_startoff; /* starting file offset */
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xfs_fsblock_t br_startblock; /* starting block number */
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xfs_filblks_t br_blockcount; /* number of blocks */
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xfs_exntst_t br_state; /* extent state */
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} xfs_bmbt_irec_t;
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/*
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* Key structure for non-leaf levels of the tree.
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*/
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typedef struct xfs_bmbt_key {
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__be64 br_startoff; /* starting file offset */
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} xfs_bmbt_key_t, xfs_bmdr_key_t;
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/* btree pointer type */
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typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
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/*
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* Btree block header size depends on a superblock flag.
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*
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* (not quite yet, but soon)
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*/
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#define XFS_BMBT_BLOCK_LEN(mp) XFS_BTREE_LBLOCK_LEN
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#define XFS_BMBT_REC_ADDR(mp, block, index) \
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((xfs_bmbt_rec_t *) \
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((char *)(block) + \
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XFS_BMBT_BLOCK_LEN(mp) + \
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((index) - 1) * sizeof(xfs_bmbt_rec_t)))
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#define XFS_BMBT_KEY_ADDR(mp, block, index) \
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((xfs_bmbt_key_t *) \
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((char *)(block) + \
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XFS_BMBT_BLOCK_LEN(mp) + \
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((index) - 1) * sizeof(xfs_bmbt_key_t)))
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#define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
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((xfs_bmbt_ptr_t *) \
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((char *)(block) + \
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XFS_BMBT_BLOCK_LEN(mp) + \
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(maxrecs) * sizeof(xfs_bmbt_key_t) + \
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((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
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#define XFS_BMDR_REC_ADDR(block, index) \
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((xfs_bmdr_rec_t *) \
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((char *)(block) + \
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sizeof(struct xfs_bmdr_block) + \
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((index) - 1) * sizeof(xfs_bmdr_rec_t)))
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#define XFS_BMDR_KEY_ADDR(block, index) \
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((xfs_bmdr_key_t *) \
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((char *)(block) + \
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sizeof(struct xfs_bmdr_block) + \
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((index) - 1) * sizeof(xfs_bmdr_key_t)))
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#define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
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((xfs_bmdr_ptr_t *) \
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((char *)(block) + \
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sizeof(struct xfs_bmdr_block) + \
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(maxrecs) * sizeof(xfs_bmdr_key_t) + \
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((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
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/*
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* These are to be used when we know the size of the block and
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* we don't have a cursor.
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*/
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#define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
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XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
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#define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
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(int)(XFS_BTREE_LBLOCK_LEN + \
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((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
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#define XFS_BMAP_BROOT_SPACE(bb) \
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(XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
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#define XFS_BMDR_SPACE_CALC(nrecs) \
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(int)(sizeof(xfs_bmdr_block_t) + \
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((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
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/*
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* Maximum number of bmap btree levels.
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*/
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#define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
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/*
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* Prototypes for xfs_bmap.c to call.
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*/
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extern void xfs_bmdr_to_bmbt(struct xfs_mount *, xfs_bmdr_block_t *, int,
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struct xfs_btree_block *, int);
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extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
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extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
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extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
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extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
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extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
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extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
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extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
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extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
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extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
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xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
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extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
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extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
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extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
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extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
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extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
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extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
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xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
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extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
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xfs_bmdr_block_t *, int);
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extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
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extern int xfs_bmdr_maxrecs(struct xfs_mount *, int blocklen, int leaf);
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extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
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extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
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struct xfs_trans *, struct xfs_inode *, int);
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#endif /* __XFS_BMAP_BTREE_H__ */
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