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Remove unused arguments from the XFS_BTREE_*_ADDR macros.

It makes it incrementally clearer to read the code when the top of a macro
spaghetti-pile only receives the 3 arguments it uses, rather than 2 extra
ones which are not used.  Also when you start pulling this thread out of the
sweater (i.e. remove unused args from XFS_BTREE_*_ADDR), a couple other
third arms etc fall off too.  If they're not used in the macro, then they
sometimes don't need to be passed to the function calling the macro either,
etc....

Patch provided by Eric Sandeen (sandeen@sandeen.net).
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Merge of xfs-linux-melb:xfs-kern:28037a by kenmcd.

  Remove unused arguments from XFS_BTREE_*_ADDR macros.
  Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

/*
 * Copyright (c) 2000-2005 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_inum.h"
#include "xfs_log.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_inode_item.h"
#include "xfs_btree.h"
#include "xfs_error.h"
#include "xfs_alloc.h"
#include "xfs_ialloc.h"
#include "xfs_fsops.h"
#include "xfs_itable.h"
#include "xfs_trans_space.h"
#include "xfs_rtalloc.h"
#include "xfs_rw.h"

/*
 * File system operations
 */

int
xfs_fs_geometry(
	xfs_mount_t		*mp,
	xfs_fsop_geom_t		*geo,
	int			new_version)
{
	geo->blocksize = mp->m_sb.sb_blocksize;
	geo->rtextsize = mp->m_sb.sb_rextsize;
	geo->agblocks = mp->m_sb.sb_agblocks;
	geo->agcount = mp->m_sb.sb_agcount;
	geo->logblocks = mp->m_sb.sb_logblocks;
	geo->sectsize = mp->m_sb.sb_sectsize;
	geo->inodesize = mp->m_sb.sb_inodesize;
	geo->imaxpct = mp->m_sb.sb_imax_pct;
	geo->datablocks = mp->m_sb.sb_dblocks;
	geo->rtblocks = mp->m_sb.sb_rblocks;
	geo->rtextents = mp->m_sb.sb_rextents;
	geo->logstart = mp->m_sb.sb_logstart;
	ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
	memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
	if (new_version >= 2) {
		geo->sunit = mp->m_sb.sb_unit;
		geo->swidth = mp->m_sb.sb_width;
	}
	if (new_version >= 3) {
		geo->version = XFS_FSOP_GEOM_VERSION;
		geo->flags =
			(XFS_SB_VERSION_HASATTR(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
			(XFS_SB_VERSION_HASNLINK(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
			(XFS_SB_VERSION_HASQUOTA(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
			(XFS_SB_VERSION_HASALIGN(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
			(XFS_SB_VERSION_HASDALIGN(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
			(XFS_SB_VERSION_HASSHARED(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
			(XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
			(XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
			(XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
			(XFS_SB_VERSION_HASATTR2(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
		geo->logsectsize = XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
				mp->m_sb.sb_logsectsize : BBSIZE;
		geo->rtsectsize = mp->m_sb.sb_blocksize;
		geo->dirblocksize = mp->m_dirblksize;
	}
	if (new_version >= 4) {
		geo->flags |=
			(XFS_SB_VERSION_HASLOGV2(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
		geo->logsunit = mp->m_sb.sb_logsunit;
	}
	return 0;
}

static int
xfs_growfs_data_private(
	xfs_mount_t		*mp,		/* mount point for filesystem */
	xfs_growfs_data_t	*in)		/* growfs data input struct */
{
	xfs_agf_t		*agf;
	xfs_agi_t		*agi;
	xfs_agnumber_t		agno;
	xfs_extlen_t		agsize;
	xfs_extlen_t		tmpsize;
	xfs_alloc_rec_t		*arec;
	xfs_btree_sblock_t	*block;
	xfs_buf_t		*bp;
	int			bucket;
	int			dpct;
	int			error;
	xfs_agnumber_t		nagcount;
	xfs_agnumber_t		nagimax = 0;
	xfs_rfsblock_t		nb, nb_mod;
	xfs_rfsblock_t		new;
	xfs_rfsblock_t		nfree;
	xfs_agnumber_t		oagcount;
	int			pct;
	xfs_sb_t		*sbp;
	xfs_trans_t		*tp;

	nb = in->newblocks;
	pct = in->imaxpct;
	if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
		return XFS_ERROR(EINVAL);
	dpct = pct - mp->m_sb.sb_imax_pct;
	error = xfs_read_buf(mp, mp->m_ddev_targp,
			XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
			XFS_FSS_TO_BB(mp, 1), 0, &bp);
	if (error)
		return error;
	ASSERT(bp);
	xfs_buf_relse(bp);

	new = nb;	/* use new as a temporary here */
	nb_mod = do_div(new, mp->m_sb.sb_agblocks);
	nagcount = new + (nb_mod != 0);
	if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
		nagcount--;
		nb = nagcount * mp->m_sb.sb_agblocks;
		if (nb < mp->m_sb.sb_dblocks)
			return XFS_ERROR(EINVAL);
	}
	new = nb - mp->m_sb.sb_dblocks;
	oagcount = mp->m_sb.sb_agcount;
	if (nagcount > oagcount) {
		down_write(&mp->m_peraglock);
		mp->m_perag = kmem_realloc(mp->m_perag,
			sizeof(xfs_perag_t) * nagcount,
			sizeof(xfs_perag_t) * oagcount,
			KM_SLEEP);
		memset(&mp->m_perag[oagcount], 0,
			(nagcount - oagcount) * sizeof(xfs_perag_t));
		mp->m_flags |= XFS_MOUNT_32BITINODES;
		nagimax = xfs_initialize_perag(XFS_MTOVFS(mp), mp, nagcount);
		up_write(&mp->m_peraglock);
	}
	tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
	if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
			XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
		xfs_trans_cancel(tp, 0);
		return error;
	}

	nfree = 0;
	for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
		/*
		 * AG freelist header block
		 */
		bp = xfs_buf_get(mp->m_ddev_targp,
				  XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
				  XFS_FSS_TO_BB(mp, 1), 0);
		agf = XFS_BUF_TO_AGF(bp);
		memset(agf, 0, mp->m_sb.sb_sectsize);
		agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
		agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
		agf->agf_seqno = cpu_to_be32(agno);
		if (agno == nagcount - 1)
			agsize =
				nb -
				(agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
		else
			agsize = mp->m_sb.sb_agblocks;
		agf->agf_length = cpu_to_be32(agsize);
		agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
		agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
		agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
		agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
		agf->agf_flfirst = 0;
		agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
		agf->agf_flcount = 0;
		tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
		agf->agf_freeblks = cpu_to_be32(tmpsize);
		agf->agf_longest = cpu_to_be32(tmpsize);
		error = xfs_bwrite(mp, bp);
		if (error) {
			goto error0;
		}
		/*
		 * AG inode header block
		 */
		bp = xfs_buf_get(mp->m_ddev_targp,
				  XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
				  XFS_FSS_TO_BB(mp, 1), 0);
		agi = XFS_BUF_TO_AGI(bp);
		memset(agi, 0, mp->m_sb.sb_sectsize);
		agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
		agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
		agi->agi_seqno = cpu_to_be32(agno);
		agi->agi_length = cpu_to_be32(agsize);
		agi->agi_count = 0;
		agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
		agi->agi_level = cpu_to_be32(1);
		agi->agi_freecount = 0;
		agi->agi_newino = cpu_to_be32(NULLAGINO);
		agi->agi_dirino = cpu_to_be32(NULLAGINO);
		for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
			agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
		error = xfs_bwrite(mp, bp);
		if (error) {
			goto error0;
		}
		/*
		 * BNO btree root block
		 */
		bp = xfs_buf_get(mp->m_ddev_targp,
			XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
			BTOBB(mp->m_sb.sb_blocksize), 0);
		block = XFS_BUF_TO_SBLOCK(bp);
		memset(block, 0, mp->m_sb.sb_blocksize);
		block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
		block->bb_level = 0;
		block->bb_numrecs = cpu_to_be16(1);
		block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
		block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
		arec = XFS_BTREE_REC_ADDR(xfs_alloc, block, 1);
		arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
		arec->ar_blockcount = cpu_to_be32(
			agsize - be32_to_cpu(arec->ar_startblock));
		error = xfs_bwrite(mp, bp);
		if (error) {
			goto error0;
		}
		/*
		 * CNT btree root block
		 */
		bp = xfs_buf_get(mp->m_ddev_targp,
			XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
			BTOBB(mp->m_sb.sb_blocksize), 0);
		block = XFS_BUF_TO_SBLOCK(bp);
		memset(block, 0, mp->m_sb.sb_blocksize);
		block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
		block->bb_level = 0;
		block->bb_numrecs = cpu_to_be16(1);
		block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
		block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
		arec = XFS_BTREE_REC_ADDR(xfs_alloc, block, 1);
		arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
		arec->ar_blockcount = cpu_to_be32(
			agsize - be32_to_cpu(arec->ar_startblock));
		nfree += be32_to_cpu(arec->ar_blockcount);
		error = xfs_bwrite(mp, bp);
		if (error) {
			goto error0;
		}
		/*
		 * INO btree root block
		 */
		bp = xfs_buf_get(mp->m_ddev_targp,
			XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
			BTOBB(mp->m_sb.sb_blocksize), 0);
		block = XFS_BUF_TO_SBLOCK(bp);
		memset(block, 0, mp->m_sb.sb_blocksize);
		block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
		block->bb_level = 0;
		block->bb_numrecs = 0;
		block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
		block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
		error = xfs_bwrite(mp, bp);
		if (error) {
			goto error0;
		}
	}
	xfs_trans_agblocks_delta(tp, nfree);
	/*
	 * There are new blocks in the old last a.g.
	 */
	if (new) {
		/*
		 * Change the agi length.
		 */
		error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
		if (error) {
			goto error0;
		}
		ASSERT(bp);
		agi = XFS_BUF_TO_AGI(bp);
		be32_add(&agi->agi_length, new);
		ASSERT(nagcount == oagcount ||
		       be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
		xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
		/*
		 * Change agf length.
		 */
		error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
		if (error) {
			goto error0;
		}
		ASSERT(bp);
		agf = XFS_BUF_TO_AGF(bp);
		be32_add(&agf->agf_length, new);
		ASSERT(be32_to_cpu(agf->agf_length) ==
		       be32_to_cpu(agi->agi_length));
		/*
		 * Free the new space.
		 */
		error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
			be32_to_cpu(agf->agf_length) - new), new);
		if (error) {
			goto error0;
		}
	}
	if (nagcount > oagcount)
		xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
	if (nb > mp->m_sb.sb_dblocks)
		xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
				 nb - mp->m_sb.sb_dblocks);
	if (nfree)
		xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
	if (dpct)
		xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
	error = xfs_trans_commit(tp, 0, NULL);
	if (error) {
		return error;
	}
	/* New allocation groups fully initialized, so update mount struct */
	if (nagimax)
		mp->m_maxagi = nagimax;
	if (mp->m_sb.sb_imax_pct) {
		__uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
		do_div(icount, 100);
		mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
	} else
		mp->m_maxicount = 0;
	for (agno = 1; agno < nagcount; agno++) {
		error = xfs_read_buf(mp, mp->m_ddev_targp,
				  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
				  XFS_FSS_TO_BB(mp, 1), 0, &bp);
		if (error) {
			xfs_fs_cmn_err(CE_WARN, mp,
			"error %d reading secondary superblock for ag %d",
				error, agno);
			break;
		}
		sbp = XFS_BUF_TO_SBP(bp);
		xfs_xlatesb(sbp, &mp->m_sb, -1, XFS_SB_ALL_BITS);
		/*
		 * If we get an error writing out the alternate superblocks,
		 * just issue a warning and continue.  The real work is
		 * already done and committed.
		 */
		if (!(error = xfs_bwrite(mp, bp))) {
			continue;
		} else {
			xfs_fs_cmn_err(CE_WARN, mp,
		"write error %d updating secondary superblock for ag %d",
				error, agno);
			break; /* no point in continuing */
		}
	}
	return 0;

 error0:
	xfs_trans_cancel(tp, XFS_TRANS_ABORT);
	return error;
}

static int
xfs_growfs_log_private(
	xfs_mount_t		*mp,	/* mount point for filesystem */
	xfs_growfs_log_t	*in)	/* growfs log input struct */
{
	xfs_extlen_t		nb;

	nb = in->newblocks;
	if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
		return XFS_ERROR(EINVAL);
	if (nb == mp->m_sb.sb_logblocks &&
	    in->isint == (mp->m_sb.sb_logstart != 0))
		return XFS_ERROR(EINVAL);
	/*
	 * Moving the log is hard, need new interfaces to sync
	 * the log first, hold off all activity while moving it.
	 * Can have shorter or longer log in the same space,
	 * or transform internal to external log or vice versa.
	 */
	return XFS_ERROR(ENOSYS);
}

/*
 * protected versions of growfs function acquire and release locks on the mount
 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
 * XFS_IOC_FSGROWFSRT
 */


int
xfs_growfs_data(
	xfs_mount_t		*mp,
	xfs_growfs_data_t	*in)
{
	int error;
	if (!cpsema(&mp->m_growlock))
		return XFS_ERROR(EWOULDBLOCK);
	error = xfs_growfs_data_private(mp, in);
	vsema(&mp->m_growlock);
	return error;
}

int
xfs_growfs_log(
	xfs_mount_t		*mp,
	xfs_growfs_log_t	*in)
{
	int error;
	if (!cpsema(&mp->m_growlock))
		return XFS_ERROR(EWOULDBLOCK);
	error = xfs_growfs_log_private(mp, in);
	vsema(&mp->m_growlock);
	return error;
}

/*
 * exported through ioctl XFS_IOC_FSCOUNTS
 */

int
xfs_fs_counts(
	xfs_mount_t		*mp,
	xfs_fsop_counts_t	*cnt)
{
	unsigned long	s;

	xfs_icsb_sync_counters_flags(mp, XFS_ICSB_LAZY_COUNT);
	s = XFS_SB_LOCK(mp);
	cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
	cnt->freertx = mp->m_sb.sb_frextents;
	cnt->freeino = mp->m_sb.sb_ifree;
	cnt->allocino = mp->m_sb.sb_icount;
	XFS_SB_UNLOCK(mp, s);
	return 0;
}

/*
 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
 *
 * xfs_reserve_blocks is called to set m_resblks
 * in the in-core mount table. The number of unused reserved blocks
 * is kept in m_resblks_avail.
 *
 * Reserve the requested number of blocks if available. Otherwise return
 * as many as possible to satisfy the request. The actual number
 * reserved are returned in outval
 *
 * A null inval pointer indicates that only the current reserved blocks
 * available  should  be returned no settings are changed.
 */

int
xfs_reserve_blocks(
	xfs_mount_t             *mp,
	__uint64_t              *inval,
	xfs_fsop_resblks_t      *outval)
{
	__int64_t		lcounter, delta, fdblks_delta;
	__uint64_t		request;
	unsigned long		s;

	/* If inval is null, report current values and return */

	if (inval == (__uint64_t *)NULL) {
		outval->resblks = mp->m_resblks;
		outval->resblks_avail = mp->m_resblks_avail;
		return 0;
	}

	request = *inval;

	/*
	 * With per-cpu counters, this becomes an interesting
	 * problem. we needto work out if we are freeing or allocation
	 * blocks first, then we can do the modification as necessary.
	 *
	 * We do this under the XFS_SB_LOCK so that if we are near
	 * ENOSPC, we will hold out any changes while we work out
	 * what to do. This means that the amount of free space can
	 * change while we do this, so we need to retry if we end up
	 * trying to reserve more space than is available.
	 *
	 * We also use the xfs_mod_incore_sb() interface so that we
	 * don't have to care about whether per cpu counter are
	 * enabled, disabled or even compiled in....
	 */
retry:
	s = XFS_SB_LOCK(mp);
	xfs_icsb_sync_counters_flags(mp, XFS_ICSB_SB_LOCKED);

	/*
	 * If our previous reservation was larger than the current value,
	 * then move any unused blocks back to the free pool.
	 */
	fdblks_delta = 0;
	if (mp->m_resblks > request) {
		lcounter = mp->m_resblks_avail - request;
		if (lcounter  > 0) {		/* release unused blocks */
			fdblks_delta = lcounter;
			mp->m_resblks_avail -= lcounter;
		}
		mp->m_resblks = request;
	} else {
		__int64_t	free;

		free =  mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
		if (!free)
			goto out; /* ENOSPC and fdblks_delta = 0 */

		delta = request - mp->m_resblks;
		lcounter = free - delta;
		if (lcounter < 0) {
			/* We can't satisfy the request, just get what we can */
			mp->m_resblks += free;
			mp->m_resblks_avail += free;
			fdblks_delta = -free;
			mp->m_sb.sb_fdblocks = XFS_ALLOC_SET_ASIDE(mp);
		} else {
			fdblks_delta = -delta;
			mp->m_sb.sb_fdblocks =
				lcounter + XFS_ALLOC_SET_ASIDE(mp);
			mp->m_resblks = request;
			mp->m_resblks_avail += delta;
		}
	}
out:
	outval->resblks = mp->m_resblks;
	outval->resblks_avail = mp->m_resblks_avail;
	XFS_SB_UNLOCK(mp, s);

	if (fdblks_delta) {
		/*
		 * If we are putting blocks back here, m_resblks_avail is
		 * already at it's max so this will put it in the free pool.
		 *
		 * If we need space, we'll either succeed in getting it
		 * from the free block count or we'll get an enospc. If
		 * we get a ENOSPC, it means things changed while we were
		 * calculating fdblks_delta and so we should try again to
		 * see if there is anything left to reserve.
		 *
		 * Don't set the reserved flag here - we don't want to reserve
		 * the extra reserve blocks from the reserve.....
		 */
		int error;
		error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0);
		if (error == ENOSPC)
			goto retry;
	}

	return 0;
}

void
xfs_fs_log_dummy(
	xfs_mount_t	*mp)
{
	xfs_trans_t	*tp;
	xfs_inode_t	*ip;

	tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
	if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) {
		xfs_trans_cancel(tp, 0);
		return;
	}

	ip = mp->m_rootip;
	xfs_ilock(ip, XFS_ILOCK_EXCL);

	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
	xfs_trans_ihold(tp, ip);
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
	xfs_trans_set_sync(tp);
	xfs_trans_commit(tp, 0, NULL);

	xfs_iunlock(ip, XFS_ILOCK_EXCL);
}

int
xfs_fs_goingdown(
	xfs_mount_t	*mp,
	__uint32_t	inflags)
{
	switch (inflags) {
	case XFS_FSOP_GOING_FLAGS_DEFAULT: {
		struct bhv_vfs *vfsp = XFS_MTOVFS(mp);
		struct super_block *sb = freeze_bdev(vfsp->vfs_super->s_bdev);

		if (sb && !IS_ERR(sb)) {
			xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
			thaw_bdev(sb->s_bdev, sb);
		}
	
		break;
	}
	case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
		xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
		break;
	case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
		xfs_force_shutdown(mp,
				SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
		break;
	default:
		return XFS_ERROR(EINVAL);
	}

	return 0;
}