483 lines
15 KiB
C
483 lines
15 KiB
C
/*
|
|
* Copyright (c) 2000-2001,2005 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_BTREE_H__
|
|
#define __XFS_BTREE_H__
|
|
|
|
struct xfs_buf;
|
|
struct xfs_bmap_free;
|
|
struct xfs_inode;
|
|
struct xfs_mount;
|
|
struct xfs_trans;
|
|
|
|
extern kmem_zone_t *xfs_btree_cur_zone;
|
|
|
|
/*
|
|
* This nonsense is to make -wlint happy.
|
|
*/
|
|
#define XFS_LOOKUP_EQ ((xfs_lookup_t)XFS_LOOKUP_EQi)
|
|
#define XFS_LOOKUP_LE ((xfs_lookup_t)XFS_LOOKUP_LEi)
|
|
#define XFS_LOOKUP_GE ((xfs_lookup_t)XFS_LOOKUP_GEi)
|
|
|
|
#define XFS_BTNUM_BNO ((xfs_btnum_t)XFS_BTNUM_BNOi)
|
|
#define XFS_BTNUM_CNT ((xfs_btnum_t)XFS_BTNUM_CNTi)
|
|
#define XFS_BTNUM_BMAP ((xfs_btnum_t)XFS_BTNUM_BMAPi)
|
|
#define XFS_BTNUM_INO ((xfs_btnum_t)XFS_BTNUM_INOi)
|
|
|
|
/*
|
|
* Generic btree header.
|
|
*
|
|
* This is a comination of the actual format used on disk for short and long
|
|
* format btrees. The first three fields are shared by both format, but
|
|
* the pointers are different and should be used with care.
|
|
*
|
|
* To get the size of the actual short or long form headers please use
|
|
* the size macros below. Never use sizeof(xfs_btree_block).
|
|
*/
|
|
struct xfs_btree_block {
|
|
__be32 bb_magic; /* magic number for block type */
|
|
__be16 bb_level; /* 0 is a leaf */
|
|
__be16 bb_numrecs; /* current # of data records */
|
|
union {
|
|
struct {
|
|
__be32 bb_leftsib;
|
|
__be32 bb_rightsib;
|
|
} s; /* short form pointers */
|
|
struct {
|
|
__be64 bb_leftsib;
|
|
__be64 bb_rightsib;
|
|
} l; /* long form pointers */
|
|
} bb_u; /* rest */
|
|
};
|
|
|
|
#define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */
|
|
#define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */
|
|
|
|
|
|
/*
|
|
* Generic key, ptr and record wrapper structures.
|
|
*
|
|
* These are disk format structures, and are converted where necessary
|
|
* by the btree specific code that needs to interpret them.
|
|
*/
|
|
union xfs_btree_ptr {
|
|
__be32 s; /* short form ptr */
|
|
__be64 l; /* long form ptr */
|
|
};
|
|
|
|
union xfs_btree_key {
|
|
xfs_bmbt_key_t bmbt;
|
|
xfs_bmdr_key_t bmbr; /* bmbt root block */
|
|
xfs_alloc_key_t alloc;
|
|
xfs_inobt_key_t inobt;
|
|
};
|
|
|
|
union xfs_btree_rec {
|
|
xfs_bmbt_rec_t bmbt;
|
|
xfs_bmdr_rec_t bmbr; /* bmbt root block */
|
|
xfs_alloc_rec_t alloc;
|
|
xfs_inobt_rec_t inobt;
|
|
};
|
|
|
|
/*
|
|
* For logging record fields.
|
|
*/
|
|
#define XFS_BB_MAGIC 0x01
|
|
#define XFS_BB_LEVEL 0x02
|
|
#define XFS_BB_NUMRECS 0x04
|
|
#define XFS_BB_LEFTSIB 0x08
|
|
#define XFS_BB_RIGHTSIB 0x10
|
|
#define XFS_BB_NUM_BITS 5
|
|
#define XFS_BB_ALL_BITS ((1 << XFS_BB_NUM_BITS) - 1)
|
|
|
|
/*
|
|
* Magic numbers for btree blocks.
|
|
*/
|
|
extern const __uint32_t xfs_magics[];
|
|
|
|
/*
|
|
* Generic stats interface
|
|
*/
|
|
#define __XFS_BTREE_STATS_INC(type, stat) \
|
|
XFS_STATS_INC(xs_ ## type ## _2_ ## stat)
|
|
#define XFS_BTREE_STATS_INC(cur, stat) \
|
|
do { \
|
|
switch (cur->bc_btnum) { \
|
|
case XFS_BTNUM_BNO: __XFS_BTREE_STATS_INC(abtb, stat); break; \
|
|
case XFS_BTNUM_CNT: __XFS_BTREE_STATS_INC(abtc, stat); break; \
|
|
case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_INC(bmbt, stat); break; \
|
|
case XFS_BTNUM_INO: __XFS_BTREE_STATS_INC(ibt, stat); break; \
|
|
case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define __XFS_BTREE_STATS_ADD(type, stat, val) \
|
|
XFS_STATS_ADD(xs_ ## type ## _2_ ## stat, val)
|
|
#define XFS_BTREE_STATS_ADD(cur, stat, val) \
|
|
do { \
|
|
switch (cur->bc_btnum) { \
|
|
case XFS_BTNUM_BNO: __XFS_BTREE_STATS_ADD(abtb, stat, val); break; \
|
|
case XFS_BTNUM_CNT: __XFS_BTREE_STATS_ADD(abtc, stat, val); break; \
|
|
case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_ADD(bmbt, stat, val); break; \
|
|
case XFS_BTNUM_INO: __XFS_BTREE_STATS_ADD(ibt, stat, val); break; \
|
|
case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define XFS_BTREE_MAXLEVELS 8 /* max of all btrees */
|
|
|
|
struct xfs_btree_ops {
|
|
/* size of the key and record structures */
|
|
size_t key_len;
|
|
size_t rec_len;
|
|
|
|
/* cursor operations */
|
|
struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *);
|
|
void (*update_cursor)(struct xfs_btree_cur *src,
|
|
struct xfs_btree_cur *dst);
|
|
|
|
/* update btree root pointer */
|
|
void (*set_root)(struct xfs_btree_cur *cur,
|
|
union xfs_btree_ptr *nptr, int level_change);
|
|
int (*kill_root)(struct xfs_btree_cur *cur, struct xfs_buf *bp,
|
|
int level, union xfs_btree_ptr *newroot);
|
|
|
|
/* block allocation / freeing */
|
|
int (*alloc_block)(struct xfs_btree_cur *cur,
|
|
union xfs_btree_ptr *start_bno,
|
|
union xfs_btree_ptr *new_bno,
|
|
int length, int *stat);
|
|
int (*free_block)(struct xfs_btree_cur *cur, struct xfs_buf *bp);
|
|
|
|
/* update last record information */
|
|
void (*update_lastrec)(struct xfs_btree_cur *cur,
|
|
struct xfs_btree_block *block,
|
|
union xfs_btree_rec *rec,
|
|
int ptr, int reason);
|
|
|
|
/* records in block/level */
|
|
int (*get_minrecs)(struct xfs_btree_cur *cur, int level);
|
|
int (*get_maxrecs)(struct xfs_btree_cur *cur, int level);
|
|
|
|
/* records on disk. Matter for the root in inode case. */
|
|
int (*get_dmaxrecs)(struct xfs_btree_cur *cur, int level);
|
|
|
|
/* init values of btree structures */
|
|
void (*init_key_from_rec)(union xfs_btree_key *key,
|
|
union xfs_btree_rec *rec);
|
|
void (*init_rec_from_key)(union xfs_btree_key *key,
|
|
union xfs_btree_rec *rec);
|
|
void (*init_rec_from_cur)(struct xfs_btree_cur *cur,
|
|
union xfs_btree_rec *rec);
|
|
void (*init_ptr_from_cur)(struct xfs_btree_cur *cur,
|
|
union xfs_btree_ptr *ptr);
|
|
|
|
/* difference between key value and cursor value */
|
|
__int64_t (*key_diff)(struct xfs_btree_cur *cur,
|
|
union xfs_btree_key *key);
|
|
|
|
#ifdef DEBUG
|
|
/* check that k1 is lower than k2 */
|
|
int (*keys_inorder)(struct xfs_btree_cur *cur,
|
|
union xfs_btree_key *k1,
|
|
union xfs_btree_key *k2);
|
|
|
|
/* check that r1 is lower than r2 */
|
|
int (*recs_inorder)(struct xfs_btree_cur *cur,
|
|
union xfs_btree_rec *r1,
|
|
union xfs_btree_rec *r2);
|
|
#endif
|
|
|
|
/* btree tracing */
|
|
#ifdef XFS_BTREE_TRACE
|
|
void (*trace_enter)(struct xfs_btree_cur *, const char *,
|
|
char *, int, int, __psunsigned_t,
|
|
__psunsigned_t, __psunsigned_t,
|
|
__psunsigned_t, __psunsigned_t,
|
|
__psunsigned_t, __psunsigned_t,
|
|
__psunsigned_t, __psunsigned_t,
|
|
__psunsigned_t, __psunsigned_t);
|
|
void (*trace_cursor)(struct xfs_btree_cur *, __uint32_t *,
|
|
__uint64_t *, __uint64_t *);
|
|
void (*trace_key)(struct xfs_btree_cur *,
|
|
union xfs_btree_key *, __uint64_t *,
|
|
__uint64_t *);
|
|
void (*trace_record)(struct xfs_btree_cur *,
|
|
union xfs_btree_rec *, __uint64_t *,
|
|
__uint64_t *, __uint64_t *);
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* Reasons for the update_lastrec method to be called.
|
|
*/
|
|
#define LASTREC_UPDATE 0
|
|
#define LASTREC_INSREC 1
|
|
#define LASTREC_DELREC 2
|
|
|
|
|
|
/*
|
|
* Btree cursor structure.
|
|
* This collects all information needed by the btree code in one place.
|
|
*/
|
|
typedef struct xfs_btree_cur
|
|
{
|
|
struct xfs_trans *bc_tp; /* transaction we're in, if any */
|
|
struct xfs_mount *bc_mp; /* file system mount struct */
|
|
const struct xfs_btree_ops *bc_ops;
|
|
uint bc_flags; /* btree features - below */
|
|
union {
|
|
xfs_alloc_rec_incore_t a;
|
|
xfs_bmbt_irec_t b;
|
|
xfs_inobt_rec_incore_t i;
|
|
} bc_rec; /* current insert/search record value */
|
|
struct xfs_buf *bc_bufs[XFS_BTREE_MAXLEVELS]; /* buf ptr per level */
|
|
int bc_ptrs[XFS_BTREE_MAXLEVELS]; /* key/record # */
|
|
__uint8_t bc_ra[XFS_BTREE_MAXLEVELS]; /* readahead bits */
|
|
#define XFS_BTCUR_LEFTRA 1 /* left sibling has been read-ahead */
|
|
#define XFS_BTCUR_RIGHTRA 2 /* right sibling has been read-ahead */
|
|
__uint8_t bc_nlevels; /* number of levels in the tree */
|
|
__uint8_t bc_blocklog; /* log2(blocksize) of btree blocks */
|
|
xfs_btnum_t bc_btnum; /* identifies which btree type */
|
|
union {
|
|
struct { /* needed for BNO, CNT, INO */
|
|
struct xfs_buf *agbp; /* agf/agi buffer pointer */
|
|
xfs_agnumber_t agno; /* ag number */
|
|
} a;
|
|
struct { /* needed for BMAP */
|
|
struct xfs_inode *ip; /* pointer to our inode */
|
|
struct xfs_bmap_free *flist; /* list to free after */
|
|
xfs_fsblock_t firstblock; /* 1st blk allocated */
|
|
int allocated; /* count of alloced */
|
|
short forksize; /* fork's inode space */
|
|
char whichfork; /* data or attr fork */
|
|
char flags; /* flags */
|
|
#define XFS_BTCUR_BPRV_WASDEL 1 /* was delayed */
|
|
} b;
|
|
} bc_private; /* per-btree type data */
|
|
} xfs_btree_cur_t;
|
|
|
|
/* cursor flags */
|
|
#define XFS_BTREE_LONG_PTRS (1<<0) /* pointers are 64bits long */
|
|
#define XFS_BTREE_ROOT_IN_INODE (1<<1) /* root may be variable size */
|
|
#define XFS_BTREE_LASTREC_UPDATE (1<<2) /* track last rec externally */
|
|
|
|
|
|
#define XFS_BTREE_NOERROR 0
|
|
#define XFS_BTREE_ERROR 1
|
|
|
|
/*
|
|
* Convert from buffer to btree block header.
|
|
*/
|
|
#define XFS_BUF_TO_BLOCK(bp) ((struct xfs_btree_block *)XFS_BUF_PTR(bp))
|
|
|
|
|
|
/*
|
|
* Check that block header is ok.
|
|
*/
|
|
int
|
|
xfs_btree_check_block(
|
|
struct xfs_btree_cur *cur, /* btree cursor */
|
|
struct xfs_btree_block *block, /* generic btree block pointer */
|
|
int level, /* level of the btree block */
|
|
struct xfs_buf *bp); /* buffer containing block, if any */
|
|
|
|
/*
|
|
* Check that (long) pointer is ok.
|
|
*/
|
|
int /* error (0 or EFSCORRUPTED) */
|
|
xfs_btree_check_lptr(
|
|
struct xfs_btree_cur *cur, /* btree cursor */
|
|
xfs_dfsbno_t ptr, /* btree block disk address */
|
|
int level); /* btree block level */
|
|
|
|
/*
|
|
* Delete the btree cursor.
|
|
*/
|
|
void
|
|
xfs_btree_del_cursor(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int error); /* del because of error */
|
|
|
|
/*
|
|
* Duplicate the btree cursor.
|
|
* Allocate a new one, copy the record, re-get the buffers.
|
|
*/
|
|
int /* error */
|
|
xfs_btree_dup_cursor(
|
|
xfs_btree_cur_t *cur, /* input cursor */
|
|
xfs_btree_cur_t **ncur);/* output cursor */
|
|
|
|
/*
|
|
* Get a buffer for the block, return it with no data read.
|
|
* Long-form addressing.
|
|
*/
|
|
struct xfs_buf * /* buffer for fsbno */
|
|
xfs_btree_get_bufl(
|
|
struct xfs_mount *mp, /* file system mount point */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_fsblock_t fsbno, /* file system block number */
|
|
uint lock); /* lock flags for get_buf */
|
|
|
|
/*
|
|
* Get a buffer for the block, return it with no data read.
|
|
* Short-form addressing.
|
|
*/
|
|
struct xfs_buf * /* buffer for agno/agbno */
|
|
xfs_btree_get_bufs(
|
|
struct xfs_mount *mp, /* file system mount point */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_agnumber_t agno, /* allocation group number */
|
|
xfs_agblock_t agbno, /* allocation group block number */
|
|
uint lock); /* lock flags for get_buf */
|
|
|
|
/*
|
|
* Check for the cursor referring to the last block at the given level.
|
|
*/
|
|
int /* 1=is last block, 0=not last block */
|
|
xfs_btree_islastblock(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int level); /* level to check */
|
|
|
|
/*
|
|
* Compute first and last byte offsets for the fields given.
|
|
* Interprets the offsets table, which contains struct field offsets.
|
|
*/
|
|
void
|
|
xfs_btree_offsets(
|
|
__int64_t fields, /* bitmask of fields */
|
|
const short *offsets,/* table of field offsets */
|
|
int nbits, /* number of bits to inspect */
|
|
int *first, /* output: first byte offset */
|
|
int *last); /* output: last byte offset */
|
|
|
|
/*
|
|
* Get a buffer for the block, return it read in.
|
|
* Long-form addressing.
|
|
*/
|
|
int /* error */
|
|
xfs_btree_read_bufl(
|
|
struct xfs_mount *mp, /* file system mount point */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_fsblock_t fsbno, /* file system block number */
|
|
uint lock, /* lock flags for read_buf */
|
|
struct xfs_buf **bpp, /* buffer for fsbno */
|
|
int refval);/* ref count value for buffer */
|
|
|
|
/*
|
|
* Get a buffer for the block, return it read in.
|
|
* Short-form addressing.
|
|
*/
|
|
int /* error */
|
|
xfs_btree_read_bufs(
|
|
struct xfs_mount *mp, /* file system mount point */
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
xfs_agnumber_t agno, /* allocation group number */
|
|
xfs_agblock_t agbno, /* allocation group block number */
|
|
uint lock, /* lock flags for read_buf */
|
|
struct xfs_buf **bpp, /* buffer for agno/agbno */
|
|
int refval);/* ref count value for buffer */
|
|
|
|
/*
|
|
* Read-ahead the block, don't wait for it, don't return a buffer.
|
|
* Long-form addressing.
|
|
*/
|
|
void /* error */
|
|
xfs_btree_reada_bufl(
|
|
struct xfs_mount *mp, /* file system mount point */
|
|
xfs_fsblock_t fsbno, /* file system block number */
|
|
xfs_extlen_t count); /* count of filesystem blocks */
|
|
|
|
/*
|
|
* Read-ahead the block, don't wait for it, don't return a buffer.
|
|
* Short-form addressing.
|
|
*/
|
|
void /* error */
|
|
xfs_btree_reada_bufs(
|
|
struct xfs_mount *mp, /* file system mount point */
|
|
xfs_agnumber_t agno, /* allocation group number */
|
|
xfs_agblock_t agbno, /* allocation group block number */
|
|
xfs_extlen_t count); /* count of filesystem blocks */
|
|
|
|
/*
|
|
* Set the buffer for level "lev" in the cursor to bp, releasing
|
|
* any previous buffer.
|
|
*/
|
|
void
|
|
xfs_btree_setbuf(
|
|
xfs_btree_cur_t *cur, /* btree cursor */
|
|
int lev, /* level in btree */
|
|
struct xfs_buf *bp); /* new buffer to set */
|
|
|
|
|
|
/*
|
|
* Common btree core entry points.
|
|
*/
|
|
int xfs_btree_increment(struct xfs_btree_cur *, int, int *);
|
|
int xfs_btree_decrement(struct xfs_btree_cur *, int, int *);
|
|
int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *);
|
|
int xfs_btree_update(struct xfs_btree_cur *, union xfs_btree_rec *);
|
|
int xfs_btree_new_iroot(struct xfs_btree_cur *, int *, int *);
|
|
int xfs_btree_kill_iroot(struct xfs_btree_cur *);
|
|
int xfs_btree_insert(struct xfs_btree_cur *, int *);
|
|
int xfs_btree_delete(struct xfs_btree_cur *, int *);
|
|
int xfs_btree_get_rec(struct xfs_btree_cur *, union xfs_btree_rec **, int *);
|
|
|
|
/*
|
|
* Internal btree helpers also used by xfs_bmap.c.
|
|
*/
|
|
void xfs_btree_log_block(struct xfs_btree_cur *, struct xfs_buf *, int);
|
|
void xfs_btree_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int, int);
|
|
|
|
/*
|
|
* Helpers.
|
|
*/
|
|
static inline int xfs_btree_get_numrecs(struct xfs_btree_block *block)
|
|
{
|
|
return be16_to_cpu(block->bb_numrecs);
|
|
}
|
|
|
|
static inline void xfs_btree_set_numrecs(struct xfs_btree_block *block,
|
|
__uint16_t numrecs)
|
|
{
|
|
block->bb_numrecs = cpu_to_be16(numrecs);
|
|
}
|
|
|
|
static inline int xfs_btree_get_level(struct xfs_btree_block *block)
|
|
{
|
|
return be16_to_cpu(block->bb_level);
|
|
}
|
|
|
|
|
|
/*
|
|
* Min and max functions for extlen, agblock, fileoff, and filblks types.
|
|
*/
|
|
#define XFS_EXTLEN_MIN(a,b) min_t(xfs_extlen_t, (a), (b))
|
|
#define XFS_EXTLEN_MAX(a,b) max_t(xfs_extlen_t, (a), (b))
|
|
#define XFS_AGBLOCK_MIN(a,b) min_t(xfs_agblock_t, (a), (b))
|
|
#define XFS_AGBLOCK_MAX(a,b) max_t(xfs_agblock_t, (a), (b))
|
|
#define XFS_FILEOFF_MIN(a,b) min_t(xfs_fileoff_t, (a), (b))
|
|
#define XFS_FILEOFF_MAX(a,b) max_t(xfs_fileoff_t, (a), (b))
|
|
#define XFS_FILBLKS_MIN(a,b) min_t(xfs_filblks_t, (a), (b))
|
|
#define XFS_FILBLKS_MAX(a,b) max_t(xfs_filblks_t, (a), (b))
|
|
|
|
#define XFS_FSB_SANITY_CHECK(mp,fsb) \
|
|
(XFS_FSB_TO_AGNO(mp, fsb) < mp->m_sb.sb_agcount && \
|
|
XFS_FSB_TO_AGBNO(mp, fsb) < mp->m_sb.sb_agblocks)
|
|
|
|
#endif /* __XFS_BTREE_H__ */
|