1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
173 lines
4.0 KiB
C
173 lines
4.0 KiB
C
/*
|
|
* Copyright (C) International Business Machines Corp., 2000-2004
|
|
*
|
|
* 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; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will 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 to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#ifndef _H_JFS_BTREE
|
|
#define _H_JFS_BTREE
|
|
|
|
/*
|
|
* jfs_btree.h: B+-tree
|
|
*
|
|
* JFS B+-tree (dtree and xtree) common definitions
|
|
*/
|
|
|
|
/*
|
|
* basic btree page - btpage
|
|
*
|
|
struct btpage {
|
|
s64 next; right sibling bn
|
|
s64 prev; left sibling bn
|
|
|
|
u8 flag;
|
|
u8 rsrvd[7]; type specific
|
|
s64 self; self address
|
|
|
|
u8 entry[4064];
|
|
}; */
|
|
|
|
/* btpaget_t flag */
|
|
#define BT_TYPE 0x07 /* B+-tree index */
|
|
#define BT_ROOT 0x01 /* root page */
|
|
#define BT_LEAF 0x02 /* leaf page */
|
|
#define BT_INTERNAL 0x04 /* internal page */
|
|
#define BT_RIGHTMOST 0x10 /* rightmost page */
|
|
#define BT_LEFTMOST 0x20 /* leftmost page */
|
|
#define BT_SWAPPED 0x80 /* used by fsck for endian swapping */
|
|
|
|
/* btorder (in inode) */
|
|
#define BT_RANDOM 0x0000
|
|
#define BT_SEQUENTIAL 0x0001
|
|
#define BT_LOOKUP 0x0010
|
|
#define BT_INSERT 0x0020
|
|
#define BT_DELETE 0x0040
|
|
|
|
/*
|
|
* btree page buffer cache access
|
|
*/
|
|
#define BT_IS_ROOT(MP) (((MP)->xflag & COMMIT_PAGE) == 0)
|
|
|
|
/* get page from buffer page */
|
|
#define BT_PAGE(IP, MP, TYPE, ROOT)\
|
|
(BT_IS_ROOT(MP) ? (TYPE *)&JFS_IP(IP)->ROOT : (TYPE *)(MP)->data)
|
|
|
|
/* get the page buffer and the page for specified block address */
|
|
#define BT_GETPAGE(IP, BN, MP, TYPE, SIZE, P, RC, ROOT)\
|
|
{\
|
|
if ((BN) == 0)\
|
|
{\
|
|
MP = (struct metapage *)&JFS_IP(IP)->bxflag;\
|
|
P = (TYPE *)&JFS_IP(IP)->ROOT;\
|
|
RC = 0;\
|
|
}\
|
|
else\
|
|
{\
|
|
MP = read_metapage((IP), BN, SIZE, 1);\
|
|
if (MP) {\
|
|
RC = 0;\
|
|
P = (MP)->data;\
|
|
} else {\
|
|
P = NULL;\
|
|
jfs_err("bread failed!");\
|
|
RC = -EIO;\
|
|
}\
|
|
}\
|
|
}
|
|
|
|
#define BT_MARK_DIRTY(MP, IP)\
|
|
{\
|
|
if (BT_IS_ROOT(MP))\
|
|
mark_inode_dirty(IP);\
|
|
else\
|
|
mark_metapage_dirty(MP);\
|
|
}
|
|
|
|
/* put the page buffer */
|
|
#define BT_PUTPAGE(MP)\
|
|
{\
|
|
if (! BT_IS_ROOT(MP)) \
|
|
release_metapage(MP); \
|
|
}
|
|
|
|
|
|
/*
|
|
* btree traversal stack
|
|
*
|
|
* record the path traversed during the search;
|
|
* top frame record the leaf page/entry selected.
|
|
*/
|
|
struct btframe { /* stack frame */
|
|
s64 bn; /* 8: */
|
|
s16 index; /* 2: */
|
|
s16 lastindex; /* 2: unused */
|
|
struct metapage *mp; /* 4/8: */
|
|
}; /* (16/24) */
|
|
|
|
struct btstack {
|
|
struct btframe *top;
|
|
int nsplit;
|
|
struct btframe stack[MAXTREEHEIGHT];
|
|
};
|
|
|
|
#define BT_CLR(btstack)\
|
|
(btstack)->top = (btstack)->stack
|
|
|
|
#define BT_STACK_FULL(btstack)\
|
|
( (btstack)->top == &((btstack)->stack[MAXTREEHEIGHT-1]))
|
|
|
|
#define BT_PUSH(BTSTACK, BN, INDEX)\
|
|
{\
|
|
assert(!BT_STACK_FULL(BTSTACK));\
|
|
(BTSTACK)->top->bn = BN;\
|
|
(BTSTACK)->top->index = INDEX;\
|
|
++(BTSTACK)->top;\
|
|
}
|
|
|
|
#define BT_POP(btstack)\
|
|
( (btstack)->top == (btstack)->stack ? NULL : --(btstack)->top )
|
|
|
|
#define BT_STACK(btstack)\
|
|
( (btstack)->top == (btstack)->stack ? NULL : (btstack)->top )
|
|
|
|
static inline void BT_STACK_DUMP(struct btstack *btstack)
|
|
{
|
|
int i;
|
|
printk("btstack dump:\n");
|
|
for (i = 0; i < MAXTREEHEIGHT; i++)
|
|
printk(KERN_ERR "bn = %Lx, index = %d\n",
|
|
(long long)btstack->stack[i].bn,
|
|
btstack->stack[i].index);
|
|
}
|
|
|
|
/* retrieve search results */
|
|
#define BT_GETSEARCH(IP, LEAF, BN, MP, TYPE, P, INDEX, ROOT)\
|
|
{\
|
|
BN = (LEAF)->bn;\
|
|
MP = (LEAF)->mp;\
|
|
if (BN)\
|
|
P = (TYPE *)MP->data;\
|
|
else\
|
|
P = (TYPE *)&JFS_IP(IP)->ROOT;\
|
|
INDEX = (LEAF)->index;\
|
|
}
|
|
|
|
/* put the page buffer of search */
|
|
#define BT_PUTSEARCH(BTSTACK)\
|
|
{\
|
|
if (! BT_IS_ROOT((BTSTACK)->top->mp))\
|
|
release_metapage((BTSTACK)->top->mp);\
|
|
}
|
|
#endif /* _H_JFS_BTREE */
|