[net-next-2.6.git] / fs / xfs / xfs_alloc_btree.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
 */
#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_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_btree_trace.h"
#include "xfs_alloc.h"
#include "xfs_error.h"
#include "xfs_trace.h"


STATIC struct xfs_btree_cur *
xfs_allocbt_dup_cursor(
	struct xfs_btree_cur	*cur)
{
	return xfs_allocbt_init_cursor(cur->bc_mp, cur->bc_tp,
			cur->bc_private.a.agbp, cur->bc_private.a.agno,
			cur->bc_btnum);
}

STATIC void
xfs_allocbt_set_root(
	struct xfs_btree_cur	*cur,
	union xfs_btree_ptr	*ptr,
	int			inc)
{
	struct xfs_buf		*agbp = cur->bc_private.a.agbp;
	struct xfs_agf		*agf = XFS_BUF_TO_AGF(agbp);
	xfs_agnumber_t		seqno = be32_to_cpu(agf->agf_seqno);
	int			btnum = cur->bc_btnum;
	struct xfs_perag	*pag = xfs_perag_get(cur->bc_mp, seqno);

	ASSERT(ptr->s != 0);

	agf->agf_roots[btnum] = ptr->s;
	be32_add_cpu(&agf->agf_levels[btnum], inc);
	pag->pagf_levels[btnum] += inc;
	xfs_perag_put(pag);

	xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS);
}

STATIC int
xfs_allocbt_alloc_block(
	struct xfs_btree_cur	*cur,
	union xfs_btree_ptr	*start,
	union xfs_btree_ptr	*new,
	int			length,
	int			*stat)
{
	int			error;
	xfs_agblock_t		bno;

	XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);

	/* Allocate the new block from the freelist. If we can't, give up.  */
	error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp,
				       &bno, 1);
	if (error) {
		XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
		return error;
	}

	if (bno == NULLAGBLOCK) {
		XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
		*stat = 0;
		return 0;
	}

	xfs_trans_agbtree_delta(cur->bc_tp, 1);
	new->s = cpu_to_be32(bno);

	XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
	*stat = 1;
	return 0;
}

STATIC int
xfs_allocbt_free_block(
	struct xfs_btree_cur	*cur,
	struct xfs_buf		*bp)
{
	struct xfs_buf		*agbp = cur->bc_private.a.agbp;
	struct xfs_agf		*agf = XFS_BUF_TO_AGF(agbp);
	xfs_agblock_t		bno;
	int			error;

	bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp));
	error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1);
	if (error)
		return error;

	/*
	 * Since blocks move to the free list without the coordination used in
	 * xfs_bmap_finish, we can't allow block to be available for
	 * reallocation and non-transaction writing (user data) until we know
	 * that the transaction that moved it to the free list is permanently
	 * on disk. We track the blocks by declaring these blocks as "busy";
	 * the busy list is maintained on a per-ag basis and each transaction
	 * records which entries should be removed when the iclog commits to
	 * disk. If a busy block is allocated, the iclog is pushed up to the
	 * LSN that freed the block.
	 */
	xfs_alloc_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1);
	xfs_trans_agbtree_delta(cur->bc_tp, -1);
	return 0;
}

/*
 * Update the longest extent in the AGF
 */
STATIC void
xfs_allocbt_update_lastrec(
	struct xfs_btree_cur	*cur,
	struct xfs_btree_block	*block,
	union xfs_btree_rec	*rec,
	int			ptr,
	int			reason)
{
	struct xfs_agf		*agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
	xfs_agnumber_t		seqno = be32_to_cpu(agf->agf_seqno);
	struct xfs_perag	*pag;
	__be32			len;
	int			numrecs;

	ASSERT(cur->bc_btnum == XFS_BTNUM_CNT);

	switch (reason) {
	case LASTREC_UPDATE:
		/*
		 * If this is the last leaf block and it's the last record,
		 * then update the size of the longest extent in the AG.
		 */
		if (ptr != xfs_btree_get_numrecs(block))
			return;
		len = rec->alloc.ar_blockcount;
		break;
	case LASTREC_INSREC:
		if (be32_to_cpu(rec->alloc.ar_blockcount) <=
		    be32_to_cpu(agf->agf_longest))
			return;
		len = rec->alloc.ar_blockcount;
		break;
	case LASTREC_DELREC:
		numrecs = xfs_btree_get_numrecs(block);
		if (ptr <= numrecs)
			return;
		ASSERT(ptr == numrecs + 1);

		if (numrecs) {
			xfs_alloc_rec_t *rrp;

			rrp = XFS_ALLOC_REC_ADDR(cur->bc_mp, block, numrecs);
			len = rrp->ar_blockcount;
		} else {
			len = 0;
		}

		break;
	default:
		ASSERT(0);
		return;
	}

	agf->agf_longest = len;
	pag = xfs_perag_get(cur->bc_mp, seqno);
	pag->pagf_longest = be32_to_cpu(len);
	xfs_perag_put(pag);
	xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp, XFS_AGF_LONGEST);
}

STATIC int
xfs_allocbt_get_minrecs(
	struct xfs_btree_cur	*cur,
	int			level)
{
	return cur->bc_mp->m_alloc_mnr[level != 0];
}

STATIC int
xfs_allocbt_get_maxrecs(
	struct xfs_btree_cur	*cur,
	int			level)
{
	return cur->bc_mp->m_alloc_mxr[level != 0];
}

STATIC void
xfs_allocbt_init_key_from_rec(
	union xfs_btree_key	*key,
	union xfs_btree_rec	*rec)
{
	ASSERT(rec->alloc.ar_startblock != 0);

	key->alloc.ar_startblock = rec->alloc.ar_startblock;
	key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
}

STATIC void
xfs_allocbt_init_rec_from_key(
	union xfs_btree_key	*key,
	union xfs_btree_rec	*rec)
{
	ASSERT(key->alloc.ar_startblock != 0);

	rec->alloc.ar_startblock = key->alloc.ar_startblock;
	rec->alloc.ar_blockcount = key->alloc.ar_blockcount;
}

STATIC void
xfs_allocbt_init_rec_from_cur(
	struct xfs_btree_cur	*cur,
	union xfs_btree_rec	*rec)
{
	ASSERT(cur->bc_rec.a.ar_startblock != 0);

	rec->alloc.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock);
	rec->alloc.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount);
}

STATIC void
xfs_allocbt_init_ptr_from_cur(
	struct xfs_btree_cur	*cur,
	union xfs_btree_ptr	*ptr)
{
	struct xfs_agf		*agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);

	ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno));
	ASSERT(agf->agf_roots[cur->bc_btnum] != 0);

	ptr->s = agf->agf_roots[cur->bc_btnum];
}

STATIC __int64_t
xfs_allocbt_key_diff(
	struct xfs_btree_cur	*cur,
	union xfs_btree_key	*key)
{
	xfs_alloc_rec_incore_t	*rec = &cur->bc_rec.a;
	xfs_alloc_key_t		*kp = &key->alloc;
	__int64_t		diff;

	if (cur->bc_btnum == XFS_BTNUM_BNO) {
		return (__int64_t)be32_to_cpu(kp->ar_startblock) -
				rec->ar_startblock;
	}

	diff = (__int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount;
	if (diff)
		return diff;

	return (__int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
}

#ifdef DEBUG
STATIC int
xfs_allocbt_keys_inorder(
	struct xfs_btree_cur	*cur,
	union xfs_btree_key	*k1,
	union xfs_btree_key	*k2)
{
	if (cur->bc_btnum == XFS_BTNUM_BNO) {
		return be32_to_cpu(k1->alloc.ar_startblock) <
		       be32_to_cpu(k2->alloc.ar_startblock);
	} else {
		return be32_to_cpu(k1->alloc.ar_blockcount) <
			be32_to_cpu(k2->alloc.ar_blockcount) ||
			(k1->alloc.ar_blockcount == k2->alloc.ar_blockcount &&
			 be32_to_cpu(k1->alloc.ar_startblock) <
			 be32_to_cpu(k2->alloc.ar_startblock));
	}
}

STATIC int
xfs_allocbt_recs_inorder(
	struct xfs_btree_cur	*cur,
	union xfs_btree_rec	*r1,
	union xfs_btree_rec	*r2)
{
	if (cur->bc_btnum == XFS_BTNUM_BNO) {
		return be32_to_cpu(r1->alloc.ar_startblock) +
			be32_to_cpu(r1->alloc.ar_blockcount) <=
			be32_to_cpu(r2->alloc.ar_startblock);
	} else {
		return be32_to_cpu(r1->alloc.ar_blockcount) <
			be32_to_cpu(r2->alloc.ar_blockcount) ||
			(r1->alloc.ar_blockcount == r2->alloc.ar_blockcount &&
			 be32_to_cpu(r1->alloc.ar_startblock) <
			 be32_to_cpu(r2->alloc.ar_startblock));
	}
}
#endif	/* DEBUG */

#ifdef XFS_BTREE_TRACE
ktrace_t	*xfs_allocbt_trace_buf;

STATIC void
xfs_allocbt_trace_enter(
	struct xfs_btree_cur	*cur,
	const char		*func,
	char			*s,
	int			type,
	int			line,
	__psunsigned_t		a0,
	__psunsigned_t		a1,
	__psunsigned_t		a2,
	__psunsigned_t		a3,
	__psunsigned_t		a4,
	__psunsigned_t		a5,
	__psunsigned_t		a6,
	__psunsigned_t		a7,
	__psunsigned_t		a8,
	__psunsigned_t		a9,
	__psunsigned_t		a10)
{
	ktrace_enter(xfs_allocbt_trace_buf, (void *)(__psint_t)type,
		(void *)func, (void *)s, NULL, (void *)cur,
		(void *)a0, (void *)a1, (void *)a2, (void *)a3,
		(void *)a4, (void *)a5, (void *)a6, (void *)a7,
		(void *)a8, (void *)a9, (void *)a10);
}

STATIC void
xfs_allocbt_trace_cursor(
	struct xfs_btree_cur	*cur,
	__uint32_t		*s0,
	__uint64_t		*l0,
	__uint64_t		*l1)
{
	*s0 = cur->bc_private.a.agno;
	*l0 = cur->bc_rec.a.ar_startblock;
	*l1 = cur->bc_rec.a.ar_blockcount;
}

STATIC void
xfs_allocbt_trace_key(
	struct xfs_btree_cur	*cur,
	union xfs_btree_key	*key,
	__uint64_t		*l0,
	__uint64_t		*l1)
{
	*l0 = be32_to_cpu(key->alloc.ar_startblock);
	*l1 = be32_to_cpu(key->alloc.ar_blockcount);
}

STATIC void
xfs_allocbt_trace_record(
	struct xfs_btree_cur	*cur,
	union xfs_btree_rec	*rec,
	__uint64_t		*l0,
	__uint64_t		*l1,
	__uint64_t		*l2)
{
	*l0 = be32_to_cpu(rec->alloc.ar_startblock);
	*l1 = be32_to_cpu(rec->alloc.ar_blockcount);
	*l2 = 0;
}
#endif /* XFS_BTREE_TRACE */

static const struct xfs_btree_ops xfs_allocbt_ops = {
	.rec_len		= sizeof(xfs_alloc_rec_t),
	.key_len		= sizeof(xfs_alloc_key_t),

	.dup_cursor		= xfs_allocbt_dup_cursor,
	.set_root		= xfs_allocbt_set_root,
	.alloc_block		= xfs_allocbt_alloc_block,
	.free_block		= xfs_allocbt_free_block,
	.update_lastrec		= xfs_allocbt_update_lastrec,
	.get_minrecs		= xfs_allocbt_get_minrecs,
	.get_maxrecs		= xfs_allocbt_get_maxrecs,
	.init_key_from_rec	= xfs_allocbt_init_key_from_rec,
	.init_rec_from_key	= xfs_allocbt_init_rec_from_key,
	.init_rec_from_cur	= xfs_allocbt_init_rec_from_cur,
	.init_ptr_from_cur	= xfs_allocbt_init_ptr_from_cur,
	.key_diff		= xfs_allocbt_key_diff,

#ifdef DEBUG
	.keys_inorder		= xfs_allocbt_keys_inorder,
	.recs_inorder		= xfs_allocbt_recs_inorder,
#endif

#ifdef XFS_BTREE_TRACE
	.trace_enter		= xfs_allocbt_trace_enter,
	.trace_cursor		= xfs_allocbt_trace_cursor,
	.trace_key		= xfs_allocbt_trace_key,
	.trace_record		= xfs_allocbt_trace_record,
#endif
};

/*
 * Allocate a new allocation btree cursor.
 */
struct xfs_btree_cur *			/* new alloc btree cursor */
xfs_allocbt_init_cursor(
	struct xfs_mount	*mp,		/* file system mount point */
	struct xfs_trans	*tp,		/* transaction pointer */
	struct xfs_buf		*agbp,		/* buffer for agf structure */
	xfs_agnumber_t		agno,		/* allocation group number */
	xfs_btnum_t		btnum)		/* btree identifier */
{
	struct xfs_agf		*agf = XFS_BUF_TO_AGF(agbp);
	struct xfs_btree_cur	*cur;

	ASSERT(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT);

	cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);

	cur->bc_tp = tp;
	cur->bc_mp = mp;
	cur->bc_nlevels = be32_to_cpu(agf->agf_levels[btnum]);
	cur->bc_btnum = btnum;
	cur->bc_blocklog = mp->m_sb.sb_blocklog;

	cur->bc_ops = &xfs_allocbt_ops;
	if (btnum == XFS_BTNUM_CNT)
		cur->bc_flags = XFS_BTREE_LASTREC_UPDATE;

	cur->bc_private.a.agbp = agbp;
	cur->bc_private.a.agno = agno;

	return cur;
}

/*
 * Calculate number of records in an alloc btree block.
 */
int
xfs_allocbt_maxrecs(
	struct xfs_mount	*mp,
	int			blocklen,
	int			leaf)
{
	blocklen -= XFS_ALLOC_BLOCK_LEN(mp);

	if (leaf)
		return blocklen / sizeof(xfs_alloc_rec_t);
	return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t));
}
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4	17	*/
1da177e4	18	#include "xfs.h"
a844f451	19	#include "xfs_fs.h"
1da177e4	20	#include "xfs_types.h"
a844f451	21	#include "xfs_bit.h"
1da177e4	22	#include "xfs_log.h"
a844f451	23	#include "xfs_inum.h"
1da177e4 LT	24	#include "xfs_trans.h"
	25	#include "xfs_sb.h"
	26	#include "xfs_ag.h"
1da177e4	27	#include "xfs_mount.h"
a844f451	28	#include "xfs_bmap_btree.h"
1da177e4 LT	29	#include "xfs_alloc_btree.h"
1da177e4 LT	30	#include "xfs_ialloc_btree.h"
a844f451 NS	31	#include "xfs_dinode.h"
a844f451 NS	32	#include "xfs_inode.h"
1da177e4	33	#include "xfs_btree.h"
f5eb8e7c	34	#include "xfs_btree_trace.h"
1da177e4 LT	35	#include "xfs_alloc.h"
1da177e4 LT	36	#include "xfs_error.h"
0b1b213f	37	#include "xfs_trace.h"
1da177e4	38
1da177e4	39
278d0ca1 CH	40	STATIC struct xfs_btree_cur *
	41	xfs_allocbt_dup_cursor(
	42	struct xfs_btree_cur *cur)
	43	{
	44	return xfs_allocbt_init_cursor(cur->bc_mp, cur->bc_tp,
	45	cur->bc_private.a.agbp, cur->bc_private.a.agno,
	46	cur->bc_btnum);
	47	}
	48
344207ce CH	49	STATIC void
	50	xfs_allocbt_set_root(
	51	struct xfs_btree_cur *cur,
	52	union xfs_btree_ptr *ptr,
	53	int inc)
	54	{
	55	struct xfs_buf *agbp = cur->bc_private.a.agbp;
	56	struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
	57	xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
	58	int btnum = cur->bc_btnum;
a862e0fd	59	struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno);
344207ce CH	60
	61	ASSERT(ptr->s != 0);
	62
	63	agf->agf_roots[btnum] = ptr->s;
	64	be32_add_cpu(&agf->agf_levels[btnum], inc);
a862e0fd DC	65	pag->pagf_levels[btnum] += inc;
a862e0fd DC	66	xfs_perag_put(pag);
344207ce CH	67
	68	xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS \| XFS_AGF_LEVELS);
	69	}
	70
f5eb8e7c CH	71	STATIC int
	72	xfs_allocbt_alloc_block(
	73	struct xfs_btree_cur *cur,
	74	union xfs_btree_ptr *start,
	75	union xfs_btree_ptr *new,
	76	int length,
	77	int *stat)
	78	{
	79	int error;
	80	xfs_agblock_t bno;
	81
	82	XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
	83
	84	/* Allocate the new block from the freelist. If we can't, give up. */
	85	error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp,
	86	&bno, 1);
	87	if (error) {
	88	XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
	89	return error;
	90	}
	91
	92	if (bno == NULLAGBLOCK) {
	93	XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
	94	*stat = 0;
	95	return 0;
	96	}
	97
	98	xfs_trans_agbtree_delta(cur->bc_tp, 1);
	99	new->s = cpu_to_be32(bno);
	100
	101	XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
	102	*stat = 1;
	103	return 0;
	104	}
	105
d4b3a4b7 CH	106	STATIC int
	107	xfs_allocbt_free_block(
	108	struct xfs_btree_cur *cur,
	109	struct xfs_buf *bp)
	110	{
	111	struct xfs_buf *agbp = cur->bc_private.a.agbp;
	112	struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
	113	xfs_agblock_t bno;
	114	int error;
	115
b6e32227	116	bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp));
d4b3a4b7 CH	117	error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1);
	118	if (error)
	119	return error;
	120
	121	/*
	122	* Since blocks move to the free list without the coordination used in
	123	* xfs_bmap_finish, we can't allow block to be available for
	124	* reallocation and non-transaction writing (user data) until we know
	125	* that the transaction that moved it to the free list is permanently
	126	* on disk. We track the blocks by declaring these blocks as "busy";
	127	* the busy list is maintained on a per-ag basis and each transaction
	128	* records which entries should be removed when the iclog commits to
	129	* disk. If a busy block is allocated, the iclog is pushed up to the
	130	* LSN that freed the block.
	131	*/
ed3b4d6c	132	xfs_alloc_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1);
d4b3a4b7 CH	133	xfs_trans_agbtree_delta(cur->bc_tp, -1);
	134	return 0;
	135	}
	136
1da177e4	137	/*
278d0ca1	138	* Update the longest extent in the AGF
1da177e4	139	*/
278d0ca1 CH	140	STATIC void
	141	xfs_allocbt_update_lastrec(
	142	struct xfs_btree_cur *cur,
	143	struct xfs_btree_block *block,
	144	union xfs_btree_rec *rec,
	145	int ptr,
	146	int reason)
1da177e4	147	{
278d0ca1 CH	148	struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
278d0ca1 CH	149	xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
a862e0fd	150	struct xfs_perag *pag;
278d0ca1	151	__be32 len;
91cca5df	152	int numrecs;
1da177e4	153
278d0ca1	154	ASSERT(cur->bc_btnum == XFS_BTNUM_CNT);
1da177e4	155
278d0ca1 CH	156	switch (reason) {
278d0ca1 CH	157	case LASTREC_UPDATE:
1da177e4	158	/*
278d0ca1 CH	159	* If this is the last leaf block and it's the last record,
278d0ca1 CH	160	* then update the size of the longest extent in the AG.
1da177e4	161	*/
278d0ca1 CH	162	if (ptr != xfs_btree_get_numrecs(block))
	163	return;
	164	len = rec->alloc.ar_blockcount;
	165	break;
4b22a571 CH	166	case LASTREC_INSREC:
	167	if (be32_to_cpu(rec->alloc.ar_blockcount) <=
	168	be32_to_cpu(agf->agf_longest))
	169	return;
	170	len = rec->alloc.ar_blockcount;
91cca5df CH	171	break;
	172	case LASTREC_DELREC:
	173	numrecs = xfs_btree_get_numrecs(block);
	174	if (ptr <= numrecs)
	175	return;
	176	ASSERT(ptr == numrecs + 1);
	177
	178	if (numrecs) {
	179	xfs_alloc_rec_t *rrp;
	180
136341b4	181	rrp = XFS_ALLOC_REC_ADDR(cur->bc_mp, block, numrecs);
91cca5df CH	182	len = rrp->ar_blockcount;
	183	} else {
	184	len = 0;
	185	}
	186
4b22a571	187	break;
278d0ca1 CH	188	default:
	189	ASSERT(0);
	190	return;
1da177e4	191	}
561f7d17	192
278d0ca1	193	agf->agf_longest = len;
a862e0fd DC	194	pag = xfs_perag_get(cur->bc_mp, seqno);
	195	pag->pagf_longest = be32_to_cpu(len);
	196	xfs_perag_put(pag);
278d0ca1	197	xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp, XFS_AGF_LONGEST);
561f7d17 CH	198	}
561f7d17 CH	199
91cca5df CH	200	STATIC int
	201	xfs_allocbt_get_minrecs(
	202	struct xfs_btree_cur *cur,
	203	int level)
	204	{
	205	return cur->bc_mp->m_alloc_mnr[level != 0];
	206	}
	207
ce5e42db CH	208	STATIC int
	209	xfs_allocbt_get_maxrecs(
	210	struct xfs_btree_cur *cur,
	211	int level)
	212	{
	213	return cur->bc_mp->m_alloc_mxr[level != 0];
	214	}
	215
fe033cc8 CH	216	STATIC void
	217	xfs_allocbt_init_key_from_rec(
	218	union xfs_btree_key *key,
	219	union xfs_btree_rec *rec)
	220	{
	221	ASSERT(rec->alloc.ar_startblock != 0);
	222
	223	key->alloc.ar_startblock = rec->alloc.ar_startblock;
	224	key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
	225	}
	226
4b22a571 CH	227	STATIC void
	228	xfs_allocbt_init_rec_from_key(
	229	union xfs_btree_key *key,
	230	union xfs_btree_rec *rec)
	231	{
	232	ASSERT(key->alloc.ar_startblock != 0);
	233
	234	rec->alloc.ar_startblock = key->alloc.ar_startblock;
	235	rec->alloc.ar_blockcount = key->alloc.ar_blockcount;
	236	}
	237
	238	STATIC void
	239	xfs_allocbt_init_rec_from_cur(
	240	struct xfs_btree_cur *cur,
	241	union xfs_btree_rec *rec)
	242	{
	243	ASSERT(cur->bc_rec.a.ar_startblock != 0);
	244
	245	rec->alloc.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock);
	246	rec->alloc.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount);
	247	}
	248
fe033cc8 CH	249	STATIC void
	250	xfs_allocbt_init_ptr_from_cur(
	251	struct xfs_btree_cur *cur,
	252	union xfs_btree_ptr *ptr)
	253	{
	254	struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
	255
	256	ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno));
	257	ASSERT(agf->agf_roots[cur->bc_btnum] != 0);
	258
	259	ptr->s = agf->agf_roots[cur->bc_btnum];
	260	}
	261
	262	STATIC __int64_t
	263	xfs_allocbt_key_diff(
	264	struct xfs_btree_cur *cur,
	265	union xfs_btree_key *key)
	266	{
	267	xfs_alloc_rec_incore_t *rec = &cur->bc_rec.a;
	268	xfs_alloc_key_t *kp = &key->alloc;
	269	__int64_t diff;
	270
	271	if (cur->bc_btnum == XFS_BTNUM_BNO) {
	272	return (__int64_t)be32_to_cpu(kp->ar_startblock) -
	273	rec->ar_startblock;
	274	}
	275
	276	diff = (__int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount;
	277	if (diff)
	278	return diff;
	279
	280	return (__int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
	281	}
	282
4a26e66e CH	283	#ifdef DEBUG
	284	STATIC int
	285	xfs_allocbt_keys_inorder(
	286	struct xfs_btree_cur *cur,
	287	union xfs_btree_key *k1,
	288	union xfs_btree_key *k2)
	289	{
	290	if (cur->bc_btnum == XFS_BTNUM_BNO) {
	291	return be32_to_cpu(k1->alloc.ar_startblock) <
	292	be32_to_cpu(k2->alloc.ar_startblock);
	293	} else {
	294	return be32_to_cpu(k1->alloc.ar_blockcount) <
	295	be32_to_cpu(k2->alloc.ar_blockcount) \|\|
	296	(k1->alloc.ar_blockcount == k2->alloc.ar_blockcount &&
	297	be32_to_cpu(k1->alloc.ar_startblock) <
	298	be32_to_cpu(k2->alloc.ar_startblock));
	299	}
	300	}
	301
	302	STATIC int
	303	xfs_allocbt_recs_inorder(
	304	struct xfs_btree_cur *cur,
	305	union xfs_btree_rec *r1,
	306	union xfs_btree_rec *r2)
	307	{
	308	if (cur->bc_btnum == XFS_BTNUM_BNO) {
	309	return be32_to_cpu(r1->alloc.ar_startblock) +
	310	be32_to_cpu(r1->alloc.ar_blockcount) <=
	311	be32_to_cpu(r2->alloc.ar_startblock);
	312	} else {
	313	return be32_to_cpu(r1->alloc.ar_blockcount) <
	314	be32_to_cpu(r2->alloc.ar_blockcount) \|\|
	315	(r1->alloc.ar_blockcount == r2->alloc.ar_blockcount &&
	316	be32_to_cpu(r1->alloc.ar_startblock) <
	317	be32_to_cpu(r2->alloc.ar_startblock));
	318	}
	319	}
	320	#endif /* DEBUG */
	321
8c4ed633 CH	322	#ifdef XFS_BTREE_TRACE
	323	ktrace_t *xfs_allocbt_trace_buf;
	324
	325	STATIC void
	326	xfs_allocbt_trace_enter(
	327	struct xfs_btree_cur *cur,
	328	const char *func,
	329	char *s,
	330	int type,
	331	int line,
	332	__psunsigned_t a0,
	333	__psunsigned_t a1,
	334	__psunsigned_t a2,
	335	__psunsigned_t a3,
	336	__psunsigned_t a4,
	337	__psunsigned_t a5,
	338	__psunsigned_t a6,
	339	__psunsigned_t a7,
	340	__psunsigned_t a8,
	341	__psunsigned_t a9,
	342	__psunsigned_t a10)
	343	{
	344	ktrace_enter(xfs_allocbt_trace_buf, (void *)(__psint_t)type,
	345	(void )func, (void )s, NULL, (void *)cur,
	346	(void )a0, (void )a1, (void )a2, (void )a3,
	347	(void )a4, (void )a5, (void )a6, (void )a7,
	348	(void )a8, (void )a9, (void *)a10);
	349	}
	350
	351	STATIC void
	352	xfs_allocbt_trace_cursor(
	353	struct xfs_btree_cur *cur,
	354	__uint32_t *s0,
	355	__uint64_t *l0,
	356	__uint64_t *l1)
	357	{
	358	*s0 = cur->bc_private.a.agno;
	359	*l0 = cur->bc_rec.a.ar_startblock;
	360	*l1 = cur->bc_rec.a.ar_blockcount;
	361	}
	362
	363	STATIC void
	364	xfs_allocbt_trace_key(
	365	struct xfs_btree_cur *cur,
	366	union xfs_btree_key *key,
	367	__uint64_t *l0,
	368	__uint64_t *l1)
	369	{
	370	*l0 = be32_to_cpu(key->alloc.ar_startblock);
	371	*l1 = be32_to_cpu(key->alloc.ar_blockcount);
	372	}
	373
	374	STATIC void
	375	xfs_allocbt_trace_record(
	376	struct xfs_btree_cur *cur,
	377	union xfs_btree_rec *rec,
	378	__uint64_t *l0,
	379	__uint64_t *l1,
	380	__uint64_t *l2)
	381	{
	382	*l0 = be32_to_cpu(rec->alloc.ar_startblock);
	383	*l1 = be32_to_cpu(rec->alloc.ar_blockcount);
	384	*l2 = 0;
	385	}
386	#endif /* XFS_BTREE_TRACE */
387
561f7d17	388	static const struct xfs_btree_ops xfs_allocbt_ops = {
65f1eaea CH	389	.rec_len = sizeof(xfs_alloc_rec_t),
	390	.key_len = sizeof(xfs_alloc_key_t),
	391
561f7d17	392	.dup_cursor = xfs_allocbt_dup_cursor,
344207ce	393	.set_root = xfs_allocbt_set_root,
f5eb8e7c	394	.alloc_block = xfs_allocbt_alloc_block,
d4b3a4b7	395	.free_block = xfs_allocbt_free_block,
278d0ca1	396	.update_lastrec = xfs_allocbt_update_lastrec,
91cca5df	397	.get_minrecs = xfs_allocbt_get_minrecs,
ce5e42db	398	.get_maxrecs = xfs_allocbt_get_maxrecs,
fe033cc8	399	.init_key_from_rec = xfs_allocbt_init_key_from_rec,
4b22a571 CH	400	.init_rec_from_key = xfs_allocbt_init_rec_from_key,
4b22a571 CH	401	.init_rec_from_cur = xfs_allocbt_init_rec_from_cur,
fe033cc8 CH	402	.init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur,
fe033cc8 CH	403	.key_diff = xfs_allocbt_key_diff,
8c4ed633	404
4a26e66e CH	405	#ifdef DEBUG
	406	.keys_inorder = xfs_allocbt_keys_inorder,
	407	.recs_inorder = xfs_allocbt_recs_inorder,
	408	#endif
	409
8c4ed633 CH	410	#ifdef XFS_BTREE_TRACE
	411	.trace_enter = xfs_allocbt_trace_enter,
	412	.trace_cursor = xfs_allocbt_trace_cursor,
	413	.trace_key = xfs_allocbt_trace_key,
	414	.trace_record = xfs_allocbt_trace_record,
	415	#endif
561f7d17 CH	416	};
	417
	418	/*
	419	* Allocate a new allocation btree cursor.
	420	*/
	421	struct xfs_btree_cur * /* new alloc btree cursor */
	422	xfs_allocbt_init_cursor(
	423	struct xfs_mount mp, / file system mount point */
	424	struct xfs_trans tp, / transaction pointer */
	425	struct xfs_buf agbp, / buffer for agf structure */
	426	xfs_agnumber_t agno, /* allocation group number */
	427	xfs_btnum_t btnum) /* btree identifier */
	428	{
	429	struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
	430	struct xfs_btree_cur *cur;
	431
	432	ASSERT(btnum == XFS_BTNUM_BNO \|\| btnum == XFS_BTNUM_CNT);
	433
	434	cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
	435
	436	cur->bc_tp = tp;
	437	cur->bc_mp = mp;
	438	cur->bc_nlevels = be32_to_cpu(agf->agf_levels[btnum]);
	439	cur->bc_btnum = btnum;
	440	cur->bc_blocklog = mp->m_sb.sb_blocklog;
	441
	442	cur->bc_ops = &xfs_allocbt_ops;
278d0ca1 CH	443	if (btnum == XFS_BTNUM_CNT)
278d0ca1 CH	444	cur->bc_flags = XFS_BTREE_LASTREC_UPDATE;
561f7d17 CH	445
	446	cur->bc_private.a.agbp = agbp;
	447	cur->bc_private.a.agno = agno;
	448
	449	return cur;
	450	}
60197e8d CH	451
	452	/*
	453	* Calculate number of records in an alloc btree block.
	454	*/
	455	int
	456	xfs_allocbt_maxrecs(
	457	struct xfs_mount *mp,
	458	int blocklen,
	459	int leaf)
	460	{
7cc95a82	461	blocklen -= XFS_ALLOC_BLOCK_LEN(mp);
60197e8d CH	462
	463	if (leaf)
	464	return blocklen / sizeof(xfs_alloc_rec_t);
	465	return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t));
	466	}