path: root/fs/xfs/xfs_btree.c

/*
 * Copyright (c) 2000-2002,2005 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
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_btree_trace.h"
#include "xfs_ialloc.h"
#include "xfs_error.h"

/*
 * Cursor allocation zone.
 */
kmem_zone_t	*xfs_btree_cur_zone;

/*
 * Btree magic numbers.
 */
const __uint32_t xfs_magics[XFS_BTNUM_MAX] = {
	XFS_ABTB_MAGIC, XFS_ABTC_MAGIC, XFS_BMAP_MAGIC, XFS_IBT_MAGIC
};

/*
 * External routines.
 */

#ifdef DEBUG
/*
 * Debug routine: check that keys are in the right order.
 */
void
xfs_btree_check_key(
	xfs_btnum_t	btnum,		/* btree identifier */
	void		*ak1,		/* pointer to left (lower) key */
	void		*ak2)		/* pointer to right (higher) key */
{
	switch (btnum) {
	case XFS_BTNUM_BNO: {
		xfs_alloc_key_t	*k1;
		xfs_alloc_key_t	*k2;

		k1 = ak1;
		k2 = ak2;
		ASSERT(be32_to_cpu(k1->ar_startblock) < be32_to_cpu(k2->ar_startblock));
		break;
	    }
	case XFS_BTNUM_CNT: {
		xfs_alloc_key_t	*k1;
		xfs_alloc_key_t	*k2;

		k1 = ak1;
		k2 = ak2;
		ASSERT(be32_to_cpu(k1->ar_blockcount) < be32_to_cpu(k2->ar_blockcount) ||
		       (k1->ar_blockcount == k2->ar_blockcount &&
			be32_to_cpu(k1->ar_startblock) < be32_to_cpu(k2->ar_startblock)));
		break;
	    }
	case XFS_BTNUM_BMAP: {
		xfs_bmbt_key_t	*k1;
		xfs_bmbt_key_t	*k2;

		k1 = ak1;
		k2 = ak2;
		ASSERT(be64_to_cpu(k1->br_startoff) < be64_to_cpu(k2->br_startoff));
		break;
	    }
	case XFS_BTNUM_INO: {
		xfs_inobt_key_t	*k1;
		xfs_inobt_key_t	*k2;

		k1 = ak1;
		k2 = ak2;
		ASSERT(be32_to_cpu(k1->ir_startino) < be32_to_cpu(k2->ir_startino));
		break;
	    }
	default:
		ASSERT(0);
	}
}

/*
 * Debug routine: check that records are in the right order.
 */
void
xfs_btree_check_rec(
	xfs_btnum_t	btnum,		/* btree identifier */
	void		*ar1,		/* pointer to left (lower) record */
	void		*ar2)		/* pointer to right (higher) record */
{
	switch (btnum) {
	case XFS_BTNUM_BNO: {
		xfs_alloc_rec_t	*r1;
		xfs_alloc_rec_t	*r2;

		r1 = ar1;
		r2 = ar2;
		ASSERT(be32_to_cpu(r1->ar_startblock) +
		       be32_to_cpu(r1->ar_blockcount) <=
		       be32_to_cpu(r2->ar_startblock));
		break;
	    }
	case XFS_BTNUM_CNT: {
		xfs_alloc_rec_t	*r1;
		xfs_alloc_rec_t	*r2;

		r1 = ar1;
		r2 = ar2;
		ASSERT(be32_to_cpu(r1->ar_blockcount