forked from Minki/linux
1a59d1b8e0
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
160 lines
3.3 KiB
C
160 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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*/
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#ifndef _H_JFS_BTREE
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#define _H_JFS_BTREE
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/*
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* jfs_btree.h: B+-tree
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*
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* JFS B+-tree (dtree and xtree) common definitions
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*/
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/*
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* basic btree page - btpage
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*
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struct btpage {
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s64 next; right sibling bn
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s64 prev; left sibling bn
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u8 flag;
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u8 rsrvd[7]; type specific
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s64 self; self address
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u8 entry[4064];
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}; */
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/* btpaget_t flag */
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#define BT_TYPE 0x07 /* B+-tree index */
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#define BT_ROOT 0x01 /* root page */
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#define BT_LEAF 0x02 /* leaf page */
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#define BT_INTERNAL 0x04 /* internal page */
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#define BT_RIGHTMOST 0x10 /* rightmost page */
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#define BT_LEFTMOST 0x20 /* leftmost page */
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#define BT_SWAPPED 0x80 /* used by fsck for endian swapping */
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/* btorder (in inode) */
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#define BT_RANDOM 0x0000
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#define BT_SEQUENTIAL 0x0001
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#define BT_LOOKUP 0x0010
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#define BT_INSERT 0x0020
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#define BT_DELETE 0x0040
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/*
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* btree page buffer cache access
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*/
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#define BT_IS_ROOT(MP) (((MP)->xflag & COMMIT_PAGE) == 0)
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/* get page from buffer page */
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#define BT_PAGE(IP, MP, TYPE, ROOT)\
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(BT_IS_ROOT(MP) ? (TYPE *)&JFS_IP(IP)->ROOT : (TYPE *)(MP)->data)
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/* get the page buffer and the page for specified block address */
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#define BT_GETPAGE(IP, BN, MP, TYPE, SIZE, P, RC, ROOT)\
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{\
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if ((BN) == 0)\
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{\
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MP = (struct metapage *)&JFS_IP(IP)->bxflag;\
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P = (TYPE *)&JFS_IP(IP)->ROOT;\
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RC = 0;\
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}\
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else\
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{\
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MP = read_metapage((IP), BN, SIZE, 1);\
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if (MP) {\
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RC = 0;\
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P = (MP)->data;\
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} else {\
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P = NULL;\
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jfs_err("bread failed!");\
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RC = -EIO;\
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}\
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}\
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}
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#define BT_MARK_DIRTY(MP, IP)\
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{\
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if (BT_IS_ROOT(MP))\
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mark_inode_dirty(IP);\
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else\
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mark_metapage_dirty(MP);\
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}
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/* put the page buffer */
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#define BT_PUTPAGE(MP)\
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{\
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if (! BT_IS_ROOT(MP)) \
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release_metapage(MP); \
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}
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/*
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* btree traversal stack
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*
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* record the path traversed during the search;
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* top frame record the leaf page/entry selected.
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*/
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struct btframe { /* stack frame */
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s64 bn; /* 8: */
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s16 index; /* 2: */
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s16 lastindex; /* 2: unused */
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struct metapage *mp; /* 4/8: */
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}; /* (16/24) */
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struct btstack {
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struct btframe *top;
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int nsplit;
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struct btframe stack[MAXTREEHEIGHT];
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};
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#define BT_CLR(btstack)\
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(btstack)->top = (btstack)->stack
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#define BT_STACK_FULL(btstack)\
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( (btstack)->top == &((btstack)->stack[MAXTREEHEIGHT-1]))
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#define BT_PUSH(BTSTACK, BN, INDEX)\
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{\
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assert(!BT_STACK_FULL(BTSTACK));\
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(BTSTACK)->top->bn = BN;\
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(BTSTACK)->top->index = INDEX;\
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++(BTSTACK)->top;\
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}
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#define BT_POP(btstack)\
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( (btstack)->top == (btstack)->stack ? NULL : --(btstack)->top )
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#define BT_STACK(btstack)\
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( (btstack)->top == (btstack)->stack ? NULL : (btstack)->top )
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static inline void BT_STACK_DUMP(struct btstack *btstack)
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{
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int i;
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printk("btstack dump:\n");
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for (i = 0; i < MAXTREEHEIGHT; i++)
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printk(KERN_ERR "bn = %Lx, index = %d\n",
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(long long)btstack->stack[i].bn,
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btstack->stack[i].index);
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}
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/* retrieve search results */
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#define BT_GETSEARCH(IP, LEAF, BN, MP, TYPE, P, INDEX, ROOT)\
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{\
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BN = (LEAF)->bn;\
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MP = (LEAF)->mp;\
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if (BN)\
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P = (TYPE *)MP->data;\
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else\
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P = (TYPE *)&JFS_IP(IP)->ROOT;\
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INDEX = (LEAF)->index;\
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}
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/* put the page buffer of search */
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#define BT_PUTSEARCH(BTSTACK)\
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{\
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if (! BT_IS_ROOT((BTSTACK)->top->mp))\
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release_metapage((BTSTACK)->top->mp);\
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}
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#endif /* _H_JFS_BTREE */
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