[mirror_ubuntu-bionic-kernel.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_alloc_busy_reuse(cur->bc_mp, cur->bc_private.a.agno, bno, 1, false);

	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;

	xfs_alloc_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1,
			      XFS_ALLOC_BUSY_SKIP_DISCARD);
	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	}
97d3ac75 CH	97
97d3ac75 CH	98	xfs_alloc_busy_reuse(cur->bc_mp, cur->bc_private.a.agno, bno, 1, false);
f5eb8e7c CH	99
	100	xfs_trans_agbtree_delta(cur->bc_tp, 1);
	101	new->s = cpu_to_be32(bno);
	102
	103	XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
	104	*stat = 1;
	105	return 0;
	106	}
	107
d4b3a4b7 CH	108	STATIC int
	109	xfs_allocbt_free_block(
	110	struct xfs_btree_cur *cur,
	111	struct xfs_buf *bp)
	112	{
	113	struct xfs_buf *agbp = cur->bc_private.a.agbp;
	114	struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
	115	xfs_agblock_t bno;
	116	int error;
	117
b6e32227	118	bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp));
d4b3a4b7 CH	119	error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1);
	120	if (error)
	121	return error;
	122
55a7bc5a CH	123	xfs_alloc_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1,
55a7bc5a CH	124	XFS_ALLOC_BUSY_SKIP_DISCARD);
d4b3a4b7 CH	125	xfs_trans_agbtree_delta(cur->bc_tp, -1);
	126	return 0;
	127	}
	128
1da177e4	129	/*
278d0ca1	130	* Update the longest extent in the AGF
1da177e4	131	*/
278d0ca1 CH	132	STATIC void
	133	xfs_allocbt_update_lastrec(
	134	struct xfs_btree_cur *cur,
	135	struct xfs_btree_block *block,
	136	union xfs_btree_rec *rec,
	137	int ptr,
	138	int reason)
1da177e4	139	{
278d0ca1 CH	140	struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
278d0ca1 CH	141	xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
a862e0fd	142	struct xfs_perag *pag;
278d0ca1	143	__be32 len;
91cca5df	144	int numrecs;
1da177e4	145
278d0ca1	146	ASSERT(cur->bc_btnum == XFS_BTNUM_CNT);
1da177e4	147
278d0ca1 CH	148	switch (reason) {
278d0ca1 CH	149	case LASTREC_UPDATE:
1da177e4	150	/*
278d0ca1 CH	151	* If this is the last leaf block and it's the last record,
278d0ca1 CH	152	* then update the size of the longest extent in the AG.
1da177e4	153	*/
278d0ca1 CH	154	if (ptr != xfs_btree_get_numrecs(block))
	155	return;
	156	len = rec->alloc.ar_blockcount;
	157	break;
4b22a571 CH	158	case LASTREC_INSREC:
	159	if (be32_to_cpu(rec->alloc.ar_blockcount) <=
	160	be32_to_cpu(agf->agf_longest))
	161	return;
	162	len = rec->alloc.ar_blockcount;
91cca5df CH	163	break;
	164	case LASTREC_DELREC:
	165	numrecs = xfs_btree_get_numrecs(block);
	166	if (ptr <= numrecs)
	167	return;
	168	ASSERT(ptr == numrecs + 1);
	169
	170	if (numrecs) {
	171	xfs_alloc_rec_t *rrp;
	172
136341b4	173	rrp = XFS_ALLOC_REC_ADDR(cur->bc_mp, block, numrecs);
91cca5df CH	174	len = rrp->ar_blockcount;
	175	} else {
	176	len = 0;
	177	}
	178
4b22a571	179	break;
278d0ca1 CH	180	default:
	181	ASSERT(0);
	182	return;
1da177e4	183	}
561f7d17	184
278d0ca1	185	agf->agf_longest = len;
a862e0fd DC	186	pag = xfs_perag_get(cur->bc_mp, seqno);
	187	pag->pagf_longest = be32_to_cpu(len);
	188	xfs_perag_put(pag);
278d0ca1	189	xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp, XFS_AGF_LONGEST);
561f7d17 CH	190	}
561f7d17 CH	191
91cca5df CH	192	STATIC int
	193	xfs_allocbt_get_minrecs(
	194	struct xfs_btree_cur *cur,
	195	int level)
	196	{
	197	return cur->bc_mp->m_alloc_mnr[level != 0];
	198	}
	199
ce5e42db CH	200	STATIC int
	201	xfs_allocbt_get_maxrecs(
	202	struct xfs_btree_cur *cur,
	203	int level)
	204	{
	205	return cur->bc_mp->m_alloc_mxr[level != 0];
	206	}
	207
fe033cc8 CH	208	STATIC void
	209	xfs_allocbt_init_key_from_rec(
	210	union xfs_btree_key *key,
	211	union xfs_btree_rec *rec)
	212	{
	213	ASSERT(rec->alloc.ar_startblock != 0);
	214
	215	key->alloc.ar_startblock = rec->alloc.ar_startblock;
	216	key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
	217	}
	218
4b22a571 CH	219	STATIC void
	220	xfs_allocbt_init_rec_from_key(
	221	union xfs_btree_key *key,
	222	union xfs_btree_rec *rec)
	223	{
	224	ASSERT(key->alloc.ar_startblock != 0);
	225
	226	rec->alloc.ar_startblock = key->alloc.ar_startblock;
	227	rec->alloc.ar_blockcount = key->alloc.ar_blockcount;
	228	}
	229
	230	STATIC void
	231	xfs_allocbt_init_rec_from_cur(
	232	struct xfs_btree_cur *cur,
	233	union xfs_btree_rec *rec)
	234	{
	235	ASSERT(cur->bc_rec.a.ar_startblock != 0);
	236
	237	rec->alloc.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock);
	238	rec->alloc.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount);
	239	}
	240
fe033cc8 CH	241	STATIC void
	242	xfs_allocbt_init_ptr_from_cur(
	243	struct xfs_btree_cur *cur,
	244	union xfs_btree_ptr *ptr)
	245	{
	246	struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
	247
	248	ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno));
	249	ASSERT(agf->agf_roots[cur->bc_btnum] != 0);
	250
	251	ptr->s = agf->agf_roots[cur->bc_btnum];
	252	}
	253
	254	STATIC __int64_t
	255	xfs_allocbt_key_diff(
	256	struct xfs_btree_cur *cur,
	257	union xfs_btree_key *key)
	258	{
	259	xfs_alloc_rec_incore_t *rec = &cur->bc_rec.a;
	260	xfs_alloc_key_t *kp = &key->alloc;
	261	__int64_t diff;
	262
	263	if (cur->bc_btnum == XFS_BTNUM_BNO) {
	264	return (__int64_t)be32_to_cpu(kp->ar_startblock) -
	265	rec->ar_startblock;
	266	}
	267
	268	diff = (__int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount;
	269	if (diff)
	270	return diff;
	271
	272	return (__int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
	273	}
	274
4a26e66e CH	275	#ifdef DEBUG
	276	STATIC int
	277	xfs_allocbt_keys_inorder(
	278	struct xfs_btree_cur *cur,
	279	union xfs_btree_key *k1,
	280	union xfs_btree_key *k2)
	281	{
	282	if (cur->bc_btnum == XFS_BTNUM_BNO) {
	283	return be32_to_cpu(k1->alloc.ar_startblock) <
	284	be32_to_cpu(k2->alloc.ar_startblock);
	285	} else {
	286	return be32_to_cpu(k1->alloc.ar_blockcount) <
	287	be32_to_cpu(k2->alloc.ar_blockcount) \|\|
	288	(k1->alloc.ar_blockcount == k2->alloc.ar_blockcount &&
	289	be32_to_cpu(k1->alloc.ar_startblock) <
	290	be32_to_cpu(k2->alloc.ar_startblock));
	291	}
	292	}
	293
	294	STATIC int
	295	xfs_allocbt_recs_inorder(
	296	struct xfs_btree_cur *cur,
	297	union xfs_btree_rec *r1,
	298	union xfs_btree_rec *r2)
	299	{
	300	if (cur->bc_btnum == XFS_BTNUM_BNO) {
	301	return be32_to_cpu(r1->alloc.ar_startblock) +
	302	be32_to_cpu(r1->alloc.ar_blockcount) <=
	303	be32_to_cpu(r2->alloc.ar_startblock);
	304	} else {
	305	return be32_to_cpu(r1->alloc.ar_blockcount) <
	306	be32_to_cpu(r2->alloc.ar_blockcount) \|\|
	307	(r1->alloc.ar_blockcount == r2->alloc.ar_blockcount &&
	308	be32_to_cpu(r1->alloc.ar_startblock) <
	309	be32_to_cpu(r2->alloc.ar_startblock));
	310	}
	311	}
	312	#endif /* DEBUG */
	313
8c4ed633 CH	314	#ifdef XFS_BTREE_TRACE
	315	ktrace_t *xfs_allocbt_trace_buf;
	316
	317	STATIC void
	318	xfs_allocbt_trace_enter(
	319	struct xfs_btree_cur *cur,
	320	const char *func,
	321	char *s,
	322	int type,
	323	int line,
	324	__psunsigned_t a0,
	325	__psunsigned_t a1,
	326	__psunsigned_t a2,
	327	__psunsigned_t a3,
	328	__psunsigned_t a4,
	329	__psunsigned_t a5,
	330	__psunsigned_t a6,
	331	__psunsigned_t a7,
	332	__psunsigned_t a8,
	333	__psunsigned_t a9,
	334	__psunsigned_t a10)
	335	{
	336	ktrace_enter(xfs_allocbt_trace_buf, (void *)(__psint_t)type,
	337	(void )func, (void )s, NULL, (void *)cur,
	338	(void )a0, (void )a1, (void )a2, (void )a3,
	339	(void )a4, (void )a5, (void )a6, (void )a7,
	340	(void )a8, (void )a9, (void *)a10);
	341	}
	342
	343	STATIC void
	344	xfs_allocbt_trace_cursor(
	345	struct xfs_btree_cur *cur,
	346	__uint32_t *s0,
	347	__uint64_t *l0,
	348	__uint64_t *l1)
	349	{
	350	*s0 = cur->bc_private.a.agno;
	351	*l0 = cur->bc_rec.a.ar_startblock;
	352	*l1 = cur->bc_rec.a.ar_blockcount;
	353	}
	354
	355	STATIC void
	356	xfs_allocbt_trace_key(
	357	struct xfs_btree_cur *cur,
	358	union xfs_btree_key *key,
	359	__uint64_t *l0,
	360	__uint64_t *l1)
	361	{
	362	*l0 = be32_to_cpu(key->alloc.ar_startblock);
	363	*l1 = be32_to_cpu(key->alloc.ar_blockcount);
	364	}
	365
	366	STATIC void
	367	xfs_allocbt_trace_record(
	368	struct xfs_btree_cur *cur,
	369	union xfs_btree_rec *rec,
	370	__uint64_t *l0,
	371	__uint64_t *l1,
	372	__uint64_t *l2)
	373	{
	374	*l0 = be32_to_cpu(rec->alloc.ar_startblock);
	375	*l1 = be32_to_cpu(rec->alloc.ar_blockcount);
	376	*l2 = 0;
	377	}
378	#endif /* XFS_BTREE_TRACE */
379
561f7d17	380	static const struct xfs_btree_ops xfs_allocbt_ops = {
65f1eaea CH	381	.rec_len = sizeof(xfs_alloc_rec_t),
	382	.key_len = sizeof(xfs_alloc_key_t),
	383
561f7d17	384	.dup_cursor = xfs_allocbt_dup_cursor,
344207ce	385	.set_root = xfs_allocbt_set_root,
f5eb8e7c	386	.alloc_block = xfs_allocbt_alloc_block,
d4b3a4b7	387	.free_block = xfs_allocbt_free_block,
278d0ca1	388	.update_lastrec = xfs_allocbt_update_lastrec,
91cca5df	389	.get_minrecs = xfs_allocbt_get_minrecs,
ce5e42db	390	.get_maxrecs = xfs_allocbt_get_maxrecs,
fe033cc8	391	.init_key_from_rec = xfs_allocbt_init_key_from_rec,
4b22a571 CH	392	.init_rec_from_key = xfs_allocbt_init_rec_from_key,
4b22a571 CH	393	.init_rec_from_cur = xfs_allocbt_init_rec_from_cur,
fe033cc8 CH	394	.init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur,
fe033cc8 CH	395	.key_diff = xfs_allocbt_key_diff,
8c4ed633	396
4a26e66e CH	397	#ifdef DEBUG
	398	.keys_inorder = xfs_allocbt_keys_inorder,
	399	.recs_inorder = xfs_allocbt_recs_inorder,
	400	#endif
	401
8c4ed633 CH	402	#ifdef XFS_BTREE_TRACE
	403	.trace_enter = xfs_allocbt_trace_enter,
	404	.trace_cursor = xfs_allocbt_trace_cursor,
	405	.trace_key = xfs_allocbt_trace_key,
	406	.trace_record = xfs_allocbt_trace_record,
	407	#endif
561f7d17 CH	408	};
	409
	410	/*
	411	* Allocate a new allocation btree cursor.
	412	*/
	413	struct xfs_btree_cur * /* new alloc btree cursor */
	414	xfs_allocbt_init_cursor(
	415	struct xfs_mount mp, / file system mount point */
	416	struct xfs_trans tp, / transaction pointer */
	417	struct xfs_buf agbp, / buffer for agf structure */
	418	xfs_agnumber_t agno, /* allocation group number */
	419	xfs_btnum_t btnum) /* btree identifier */
	420	{
	421	struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
	422	struct xfs_btree_cur *cur;
	423
	424	ASSERT(btnum == XFS_BTNUM_BNO \|\| btnum == XFS_BTNUM_CNT);
	425
	426	cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
	427
	428	cur->bc_tp = tp;
	429	cur->bc_mp = mp;
	430	cur->bc_nlevels = be32_to_cpu(agf->agf_levels[btnum]);
	431	cur->bc_btnum = btnum;
	432	cur->bc_blocklog = mp->m_sb.sb_blocklog;
	433
	434	cur->bc_ops = &xfs_allocbt_ops;
278d0ca1 CH	435	if (btnum == XFS_BTNUM_CNT)
278d0ca1 CH	436	cur->bc_flags = XFS_BTREE_LASTREC_UPDATE;
561f7d17 CH	437
	438	cur->bc_private.a.agbp = agbp;
	439	cur->bc_private.a.agno = agno;
	440
	441	return cur;
	442	}
60197e8d CH	443
	444	/*
	445	* Calculate number of records in an alloc btree block.
	446	*/
	447	int
	448	xfs_allocbt_maxrecs(
	449	struct xfs_mount *mp,
	450	int blocklen,
	451	int leaf)
	452	{
7cc95a82	453	blocklen -= XFS_ALLOC_BLOCK_LEN(mp);
60197e8d CH	454
	455	if (leaf)
	456	return blocklen / sizeof(xfs_alloc_rec_t);
	457	return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t));
	458	}