[linux-2.6-block.git] / fs / xfs / xfs_fsops.c

/*
 * 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_haslazysbcount(&mp->m_sb) ?
				XFS_FSOP_GEOM_FLAGS_LAZYSB : 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);
	if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
		return error;
	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);
	tp->t_flags |= XFS_TRANS_RESERVE;
	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));
		xfs_alloc_log_agf(tp, bp, XFS_AGF_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);
	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) {
		if (!outval)
			return EINVAL;
		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:
	if (outval) {
		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);

	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;
}
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2005 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 LT	22	#include "xfs_inum.h"
	23	#include "xfs_log.h"
	24	#include "xfs_trans.h"
	25	#include "xfs_sb.h"
a844f451	26	#include "xfs_ag.h"
a844f451	27	#include "xfs_dir2.h"
1da177e4 LT	28	#include "xfs_dmapi.h"
1da177e4 LT	29	#include "xfs_mount.h"
1da177e4	30	#include "xfs_bmap_btree.h"
a844f451	31	#include "xfs_alloc_btree.h"
1da177e4	32	#include "xfs_ialloc_btree.h"
a844f451 NS	33	#include "xfs_dir2_sf.h"
	34	#include "xfs_attr_sf.h"
	35	#include "xfs_dinode.h"
	36	#include "xfs_inode.h"
	37	#include "xfs_inode_item.h"
1da177e4 LT	38	#include "xfs_btree.h"
	39	#include "xfs_error.h"
	40	#include "xfs_alloc.h"
	41	#include "xfs_ialloc.h"
	42	#include "xfs_fsops.h"
	43	#include "xfs_itable.h"
1da177e4 LT	44	#include "xfs_trans_space.h"
1da177e4 LT	45	#include "xfs_rtalloc.h"
a844f451	46	#include "xfs_rw.h"
1da177e4 LT	47
	48	/*
	49	* File system operations
	50	*/
	51
	52	int
	53	xfs_fs_geometry(
	54	xfs_mount_t *mp,
	55	xfs_fsop_geom_t *geo,
	56	int new_version)
	57	{
	58	geo->blocksize = mp->m_sb.sb_blocksize;
	59	geo->rtextsize = mp->m_sb.sb_rextsize;
	60	geo->agblocks = mp->m_sb.sb_agblocks;
	61	geo->agcount = mp->m_sb.sb_agcount;
	62	geo->logblocks = mp->m_sb.sb_logblocks;
	63	geo->sectsize = mp->m_sb.sb_sectsize;
	64	geo->inodesize = mp->m_sb.sb_inodesize;
	65	geo->imaxpct = mp->m_sb.sb_imax_pct;
	66	geo->datablocks = mp->m_sb.sb_dblocks;
	67	geo->rtblocks = mp->m_sb.sb_rblocks;
	68	geo->rtextents = mp->m_sb.sb_rextents;
	69	geo->logstart = mp->m_sb.sb_logstart;
	70	ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
	71	memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
	72	if (new_version >= 2) {
	73	geo->sunit = mp->m_sb.sb_unit;
	74	geo->swidth = mp->m_sb.sb_width;
	75	}
	76	if (new_version >= 3) {
	77	geo->version = XFS_FSOP_GEOM_VERSION;
	78	geo->flags =
	79	(XFS_SB_VERSION_HASATTR(&mp->m_sb) ?
	80	XFS_FSOP_GEOM_FLAGS_ATTR : 0) \|
	81	(XFS_SB_VERSION_HASNLINK(&mp->m_sb) ?
	82	XFS_FSOP_GEOM_FLAGS_NLINK : 0) \|
	83	(XFS_SB_VERSION_HASQUOTA(&mp->m_sb) ?
	84	XFS_FSOP_GEOM_FLAGS_QUOTA : 0) \|
	85	(XFS_SB_VERSION_HASALIGN(&mp->m_sb) ?
	86	XFS_FSOP_GEOM_FLAGS_IALIGN : 0) \|
	87	(XFS_SB_VERSION_HASDALIGN(&mp->m_sb) ?
	88	XFS_FSOP_GEOM_FLAGS_DALIGN : 0) \|
	89	(XFS_SB_VERSION_HASSHARED(&mp->m_sb) ?
	90	XFS_FSOP_GEOM_FLAGS_SHARED : 0) \|
	91	(XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb) ?
	92	XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) \|
	93	(XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
	94	XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) \|
	95	(XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
d8cc890d	96	XFS_FSOP_GEOM_FLAGS_SECTOR : 0) \|
92821e2b DC	97	(xfs_sb_version_haslazysbcount(&mp->m_sb) ?
92821e2b DC	98	XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) \|
d8cc890d NS	99	(XFS_SB_VERSION_HASATTR2(&mp->m_sb) ?
d8cc890d NS	100	XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
1da177e4 LT	101	geo->logsectsize = XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
	102	mp->m_sb.sb_logsectsize : BBSIZE;
	103	geo->rtsectsize = mp->m_sb.sb_blocksize;
	104	geo->dirblocksize = mp->m_dirblksize;
	105	}
	106	if (new_version >= 4) {
	107	geo->flags \|=
	108	(XFS_SB_VERSION_HASLOGV2(&mp->m_sb) ?
	109	XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
	110	geo->logsunit = mp->m_sb.sb_logsunit;
	111	}
	112	return 0;
	113	}
	114
	115	static int
	116	xfs_growfs_data_private(
	117	xfs_mount_t mp, / mount point for filesystem */
	118	xfs_growfs_data_t in) / growfs data input struct */
	119	{
	120	xfs_agf_t *agf;
	121	xfs_agi_t *agi;
	122	xfs_agnumber_t agno;
	123	xfs_extlen_t agsize;
	124	xfs_extlen_t tmpsize;
	125	xfs_alloc_rec_t *arec;
	126	xfs_btree_sblock_t *block;
	127	xfs_buf_t *bp;
	128	int bucket;
	129	int dpct;
	130	int error;
	131	xfs_agnumber_t nagcount;
	132	xfs_agnumber_t nagimax = 0;
	133	xfs_rfsblock_t nb, nb_mod;
	134	xfs_rfsblock_t new;
	135	xfs_rfsblock_t nfree;
	136	xfs_agnumber_t oagcount;
	137	int pct;
	138	xfs_sb_t *sbp;
	139	xfs_trans_t *tp;
	140
	141	nb = in->newblocks;
	142	pct = in->imaxpct;
	143	if (nb < mp->m_sb.sb_dblocks \|\| pct < 0 \|\| pct > 100)
	144	return XFS_ERROR(EINVAL);
4cc929ee NS	145	if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
4cc929ee NS	146	return error;
1da177e4 LT	147	dpct = pct - mp->m_sb.sb_imax_pct;
	148	error = xfs_read_buf(mp, mp->m_ddev_targp,
	149	XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
	150	XFS_FSS_TO_BB(mp, 1), 0, &bp);
	151	if (error)
	152	return error;
	153	ASSERT(bp);
	154	xfs_buf_relse(bp);
	155
	156	new = nb; /* use new as a temporary here */
	157	nb_mod = do_div(new, mp->m_sb.sb_agblocks);
	158	nagcount = new + (nb_mod != 0);
	159	if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
	160	nagcount--;
	161	nb = nagcount * mp->m_sb.sb_agblocks;
	162	if (nb < mp->m_sb.sb_dblocks)
	163	return XFS_ERROR(EINVAL);
	164	}
	165	new = nb - mp->m_sb.sb_dblocks;
	166	oagcount = mp->m_sb.sb_agcount;
	167	if (nagcount > oagcount) {
	168	down_write(&mp->m_peraglock);
	169	mp->m_perag = kmem_realloc(mp->m_perag,
	170	sizeof(xfs_perag_t) * nagcount,
	171	sizeof(xfs_perag_t) * oagcount,
	172	KM_SLEEP);
	173	memset(&mp->m_perag[oagcount], 0,
	174	(nagcount - oagcount) * sizeof(xfs_perag_t));
	175	mp->m_flags \|= XFS_MOUNT_32BITINODES;
c11e2c36	176	nagimax = xfs_initialize_perag(XFS_MTOVFS(mp), mp, nagcount);
1da177e4 LT	177	up_write(&mp->m_peraglock);
	178	}
	179	tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
84e1e99f	180	tp->t_flags \|= XFS_TRANS_RESERVE;
1da177e4 LT	181	if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
	182	XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
	183	xfs_trans_cancel(tp, 0);
	184	return error;
	185	}
	186
	187	nfree = 0;
	188	for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
	189	/*
	190	* AG freelist header block
	191	*/
	192	bp = xfs_buf_get(mp->m_ddev_targp,
	193	XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
	194	XFS_FSS_TO_BB(mp, 1), 0);
	195	agf = XFS_BUF_TO_AGF(bp);
	196	memset(agf, 0, mp->m_sb.sb_sectsize);
16259e7d CH	197	agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
	198	agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
	199	agf->agf_seqno = cpu_to_be32(agno);
1da177e4 LT	200	if (agno == nagcount - 1)
	201	agsize =
	202	nb -
	203	(agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
	204	else
	205	agsize = mp->m_sb.sb_agblocks;
16259e7d CH	206	agf->agf_length = cpu_to_be32(agsize);
	207	agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
	208	agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
	209	agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
	210	agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
1da177e4	211	agf->agf_flfirst = 0;
16259e7d	212	agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
1da177e4 LT	213	agf->agf_flcount = 0;
1da177e4 LT	214	tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
16259e7d CH	215	agf->agf_freeblks = cpu_to_be32(tmpsize);
16259e7d CH	216	agf->agf_longest = cpu_to_be32(tmpsize);
1da177e4 LT	217	error = xfs_bwrite(mp, bp);
	218	if (error) {
	219	goto error0;
	220	}
	221	/*
	222	* AG inode header block
	223	*/
	224	bp = xfs_buf_get(mp->m_ddev_targp,
	225	XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
	226	XFS_FSS_TO_BB(mp, 1), 0);
	227	agi = XFS_BUF_TO_AGI(bp);
	228	memset(agi, 0, mp->m_sb.sb_sectsize);
16259e7d CH	229	agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
	230	agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
	231	agi->agi_seqno = cpu_to_be32(agno);
	232	agi->agi_length = cpu_to_be32(agsize);
1da177e4	233	agi->agi_count = 0;
16259e7d CH	234	agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
16259e7d CH	235	agi->agi_level = cpu_to_be32(1);
1da177e4	236	agi->agi_freecount = 0;
16259e7d CH	237	agi->agi_newino = cpu_to_be32(NULLAGINO);
16259e7d CH	238	agi->agi_dirino = cpu_to_be32(NULLAGINO);
1da177e4	239	for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
16259e7d	240	agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
1da177e4 LT	241	error = xfs_bwrite(mp, bp);
	242	if (error) {
	243	goto error0;
	244	}
	245	/*
	246	* BNO btree root block
	247	*/
	248	bp = xfs_buf_get(mp->m_ddev_targp,
	249	XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
	250	BTOBB(mp->m_sb.sb_blocksize), 0);
	251	block = XFS_BUF_TO_SBLOCK(bp);
	252	memset(block, 0, mp->m_sb.sb_blocksize);
16259e7d	253	block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
1da177e4	254	block->bb_level = 0;
16259e7d CH	255	block->bb_numrecs = cpu_to_be16(1);
	256	block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
	257	block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
2c36dded	258	arec = XFS_BTREE_REC_ADDR(xfs_alloc, block, 1);
16259e7d CH	259	arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
	260	arec->ar_blockcount = cpu_to_be32(
	261	agsize - be32_to_cpu(arec->ar_startblock));
1da177e4 LT	262	error = xfs_bwrite(mp, bp);
	263	if (error) {
	264	goto error0;
	265	}
	266	/*
	267	* CNT btree root block
	268	*/
	269	bp = xfs_buf_get(mp->m_ddev_targp,
	270	XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
	271	BTOBB(mp->m_sb.sb_blocksize), 0);
	272	block = XFS_BUF_TO_SBLOCK(bp);
	273	memset(block, 0, mp->m_sb.sb_blocksize);
16259e7d	274	block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
1da177e4	275	block->bb_level = 0;
16259e7d CH	276	block->bb_numrecs = cpu_to_be16(1);
	277	block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
	278	block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
2c36dded	279	arec = XFS_BTREE_REC_ADDR(xfs_alloc, block, 1);
16259e7d CH	280	arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
	281	arec->ar_blockcount = cpu_to_be32(
	282	agsize - be32_to_cpu(arec->ar_startblock));
	283	nfree += be32_to_cpu(arec->ar_blockcount);
1da177e4 LT	284	error = xfs_bwrite(mp, bp);
	285	if (error) {
	286	goto error0;
	287	}
	288	/*
	289	* INO btree root block
	290	*/
	291	bp = xfs_buf_get(mp->m_ddev_targp,
	292	XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
	293	BTOBB(mp->m_sb.sb_blocksize), 0);
	294	block = XFS_BUF_TO_SBLOCK(bp);
	295	memset(block, 0, mp->m_sb.sb_blocksize);
16259e7d	296	block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
1da177e4 LT	297	block->bb_level = 0;
1da177e4 LT	298	block->bb_numrecs = 0;
16259e7d CH	299	block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
16259e7d CH	300	block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
1da177e4 LT	301	error = xfs_bwrite(mp, bp);
	302	if (error) {
	303	goto error0;
	304	}
	305	}
	306	xfs_trans_agblocks_delta(tp, nfree);
	307	/*
	308	* There are new blocks in the old last a.g.
	309	*/
	310	if (new) {
	311	/*
	312	* Change the agi length.
	313	*/
	314	error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
	315	if (error) {
	316	goto error0;
	317	}
	318	ASSERT(bp);
	319	agi = XFS_BUF_TO_AGI(bp);
16259e7d	320	be32_add(&agi->agi_length, new);
1da177e4	321	ASSERT(nagcount == oagcount \|\|
16259e7d	322	be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
1da177e4 LT	323	xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
	324	/*
	325	* Change agf length.
	326	*/
	327	error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
	328	if (error) {
	329	goto error0;
	330	}
	331	ASSERT(bp);
	332	agf = XFS_BUF_TO_AGF(bp);
16259e7d CH	333	be32_add(&agf->agf_length, new);
	334	ASSERT(be32_to_cpu(agf->agf_length) ==
	335	be32_to_cpu(agi->agi_length));
0164af51	336	xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
1da177e4 LT	337	/*
	338	* Free the new space.
	339	*/
	340	error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
16259e7d	341	be32_to_cpu(agf->agf_length) - new), new);
1da177e4 LT	342	if (error) {
	343	goto error0;
	344	}
	345	}
	346	if (nagcount > oagcount)
	347	xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
	348	if (nb > mp->m_sb.sb_dblocks)
	349	xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
	350	nb - mp->m_sb.sb_dblocks);
	351	if (nfree)
	352	xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
	353	if (dpct)
	354	xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
1c72bf90	355	error = xfs_trans_commit(tp, 0);
1da177e4 LT	356	if (error) {
	357	return error;
	358	}
	359	/* New allocation groups fully initialized, so update mount struct */
	360	if (nagimax)
	361	mp->m_maxagi = nagimax;
	362	if (mp->m_sb.sb_imax_pct) {
	363	__uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
	364	do_div(icount, 100);
	365	mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
	366	} else
	367	mp->m_maxicount = 0;
	368	for (agno = 1; agno < nagcount; agno++) {
	369	error = xfs_read_buf(mp, mp->m_ddev_targp,
	370	XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
	371	XFS_FSS_TO_BB(mp, 1), 0, &bp);
	372	if (error) {
	373	xfs_fs_cmn_err(CE_WARN, mp,
	374	"error %d reading secondary superblock for ag %d",
	375	error, agno);
	376	break;
	377	}
	378	sbp = XFS_BUF_TO_SBP(bp);
	379	xfs_xlatesb(sbp, &mp->m_sb, -1, XFS_SB_ALL_BITS);
	380	/*
	381	* If we get an error writing out the alternate superblocks,
	382	* just issue a warning and continue. The real work is
	383	* already done and committed.
	384	*/
	385	if (!(error = xfs_bwrite(mp, bp))) {
	386	continue;
	387	} else {
	388	xfs_fs_cmn_err(CE_WARN, mp,
	389	"write error %d updating secondary superblock for ag %d",
	390	error, agno);
	391	break; /* no point in continuing */
	392	}
	393	}
	394	return 0;
	395
	396	error0:
	397	xfs_trans_cancel(tp, XFS_TRANS_ABORT);
	398	return error;
	399	}
	400
	401	static int
	402	xfs_growfs_log_private(
	403	xfs_mount_t mp, / mount point for filesystem */
	404	xfs_growfs_log_t in) / growfs log input struct */
	405	{
	406	xfs_extlen_t nb;
	407
	408	nb = in->newblocks;
	409	if (nb < XFS_MIN_LOG_BLOCKS \|\| nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
	410	return XFS_ERROR(EINVAL);
	411	if (nb == mp->m_sb.sb_logblocks &&
	412	in->isint == (mp->m_sb.sb_logstart != 0))
	413	return XFS_ERROR(EINVAL);
	414	/*
	415	* Moving the log is hard, need new interfaces to sync
	416	* the log first, hold off all activity while moving it.
	417	* Can have shorter or longer log in the same space,
	418	* or transform internal to external log or vice versa.
	419	*/
420	return XFS_ERROR(ENOSYS);
421	}
422
423	/*
424	* protected versions of growfs function acquire and release locks on the mount
425	* point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
426	* XFS_IOC_FSGROWFSRT
427	*/
428
429
430	int
431	xfs_growfs_data(
432	xfs_mount_t *mp,
433	xfs_growfs_data_t *in)
434	{
435	int error;
436	if (!cpsema(&mp->m_growlock))
437	return XFS_ERROR(EWOULDBLOCK);
438	error = xfs_growfs_data_private(mp, in);
439	vsema(&mp->m_growlock);
440	return error;
441	}
442
443	int
444	xfs_growfs_log(
445	xfs_mount_t *mp,
446	xfs_growfs_log_t *in)
447	{
448	int error;
449	if (!cpsema(&mp->m_growlock))
450	return XFS_ERROR(EWOULDBLOCK);
451	error = xfs_growfs_log_private(mp, in);
452	vsema(&mp->m_growlock);
453	return error;
454	}
455
456	/*
457	* exported through ioctl XFS_IOC_FSCOUNTS
458	*/
459
460	int
461	xfs_fs_counts(
462	xfs_mount_t *mp,
463	xfs_fsop_counts_t *cnt)
464	{
465	unsigned long s;
466
dbcabad1	467	xfs_icsb_sync_counters_flags(mp, XFS_ICSB_LAZY_COUNT);
1da177e4	468	s = XFS_SB_LOCK(mp);
4be536de	469	cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1da177e4 LT	470	cnt->freertx = mp->m_sb.sb_frextents;
	471	cnt->freeino = mp->m_sb.sb_ifree;
	472	cnt->allocino = mp->m_sb.sb_icount;
	473	XFS_SB_UNLOCK(mp, s);
	474	return 0;
	475	}
	476
	477	/*
	478	* exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
	479	*
	480	* xfs_reserve_blocks is called to set m_resblks
	481	* in the in-core mount table. The number of unused reserved blocks
c41564b5	482	* is kept in m_resblks_avail.
1da177e4 LT	483	*
	484	* Reserve the requested number of blocks if available. Otherwise return
	485	* as many as possible to satisfy the request. The actual number
	486	* reserved are returned in outval
	487	*
	488	* A null inval pointer indicates that only the current reserved blocks
	489	* available should be returned no settings are changed.
	490	*/
	491
	492	int
	493	xfs_reserve_blocks(
	494	xfs_mount_t *mp,
	495	__uint64_t *inval,
	496	xfs_fsop_resblks_t *outval)
	497	{
dbcabad1	498	__int64_t lcounter, delta, fdblks_delta;
1da177e4 LT	499	__uint64_t request;
	500	unsigned long s;
	501
	502	/* If inval is null, report current values and return */
1da177e4	503	if (inval == (__uint64_t *)NULL) {
84e1e99f DC	504	if (!outval)
84e1e99f DC	505	return EINVAL;
1da177e4 LT	506	outval->resblks = mp->m_resblks;
1da177e4 LT	507	outval->resblks_avail = mp->m_resblks_avail;
014c2544	508	return 0;
1da177e4 LT	509	}
	510
	511	request = *inval;
dbcabad1 DC	512
	513	/*
	514	* With per-cpu counters, this becomes an interesting
	515	* problem. we needto work out if we are freeing or allocation
	516	* blocks first, then we can do the modification as necessary.
	517	*
	518	* We do this under the XFS_SB_LOCK so that if we are near
	519	* ENOSPC, we will hold out any changes while we work out
	520	* what to do. This means that the amount of free space can
	521	* change while we do this, so we need to retry if we end up
	522	* trying to reserve more space than is available.
	523	*
	524	* We also use the xfs_mod_incore_sb() interface so that we
	525	* don't have to care about whether per cpu counter are
	526	* enabled, disabled or even compiled in....
	527	*/
	528	retry:
1da177e4	529	s = XFS_SB_LOCK(mp);
dbcabad1	530	xfs_icsb_sync_counters_flags(mp, XFS_ICSB_SB_LOCKED);
1da177e4 LT	531
	532	/*
	533	* If our previous reservation was larger than the current value,
	534	* then move any unused blocks back to the free pool.
	535	*/
dbcabad1	536	fdblks_delta = 0;
1da177e4 LT	537	if (mp->m_resblks > request) {
	538	lcounter = mp->m_resblks_avail - request;
	539	if (lcounter > 0) { /* release unused blocks */
dbcabad1	540	fdblks_delta = lcounter;
1da177e4 LT	541	mp->m_resblks_avail -= lcounter;
	542	}
	543	mp->m_resblks = request;
	544	} else {
4be536de DC	545	__int64_t free;
	546
	547	free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
dbcabad1 DC	548	if (!free)
	549	goto out; /* ENOSPC and fdblks_delta = 0 */
	550
1da177e4	551	delta = request - mp->m_resblks;
4be536de	552	lcounter = free - delta;
1da177e4 LT	553	if (lcounter < 0) {
1da177e4 LT	554	/* We can't satisfy the request, just get what we can */
4be536de DC	555	mp->m_resblks += free;
4be536de DC	556	mp->m_resblks_avail += free;
dbcabad1	557	fdblks_delta = -free;
4be536de	558	mp->m_sb.sb_fdblocks = XFS_ALLOC_SET_ASIDE(mp);
1da177e4	559	} else {
dbcabad1	560	fdblks_delta = -delta;
4be536de DC	561	mp->m_sb.sb_fdblocks =
4be536de DC	562	lcounter + XFS_ALLOC_SET_ASIDE(mp);
1da177e4 LT	563	mp->m_resblks = request;
	564	mp->m_resblks_avail += delta;
	565	}
	566	}
dbcabad1	567	out:
84e1e99f DC	568	if (outval) {
	569	outval->resblks = mp->m_resblks;
	570	outval->resblks_avail = mp->m_resblks_avail;
	571	}
1da177e4	572	XFS_SB_UNLOCK(mp, s);
dbcabad1 DC	573
	574	if (fdblks_delta) {
	575	/*
	576	* If we are putting blocks back here, m_resblks_avail is
	577	* already at it's max so this will put it in the free pool.
	578	*
	579	* If we need space, we'll either succeed in getting it
	580	* from the free block count or we'll get an enospc. If
	581	* we get a ENOSPC, it means things changed while we were
	582	* calculating fdblks_delta and so we should try again to
	583	* see if there is anything left to reserve.
	584	*
	585	* Don't set the reserved flag here - we don't want to reserve
	586	* the extra reserve blocks from the reserve.....
	587	*/
	588	int error;
	589	error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0);
	590	if (error == ENOSPC)
	591	goto retry;
	592	}
	593
014c2544	594	return 0;
1da177e4 LT	595	}
1da177e4 LT	596
e13a73f0	597	void
421ad134 NS	598	xfs_fs_log_dummy(
421ad134 NS	599	xfs_mount_t *mp)
e13a73f0	600	{
421ad134 NS	601	xfs_trans_t *tp;
421ad134 NS	602	xfs_inode_t *ip;
e13a73f0 CH	603
e13a73f0 CH	604	tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
e13a73f0 CH	605	if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) {
	606	xfs_trans_cancel(tp, 0);
	607	return;
	608	}
	609
	610	ip = mp->m_rootip;
	611	xfs_ilock(ip, XFS_ILOCK_EXCL);
	612
	613	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
	614	xfs_trans_ihold(tp, ip);
	615	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
	616	xfs_trans_set_sync(tp);
1c72bf90	617	xfs_trans_commit(tp, 0);
e13a73f0 CH	618
	619	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	620	}
	621
1da177e4 LT	622	int
	623	xfs_fs_goingdown(
	624	xfs_mount_t *mp,
	625	__uint32_t inflags)
	626	{
	627	switch (inflags) {
	628	case XFS_FSOP_GOING_FLAGS_DEFAULT: {
b83bd138	629	struct bhv_vfs *vfsp = XFS_MTOVFS(mp);
1da177e4 LT	630	struct super_block *sb = freeze_bdev(vfsp->vfs_super->s_bdev);
1da177e4 LT	631
f33c6797	632	if (sb && !IS_ERR(sb)) {
7d04a335	633	xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
1da177e4 LT	634	thaw_bdev(sb->s_bdev, sb);
	635	}
	636
	637	break;
	638	}
	639	case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
7d04a335	640	xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
1da177e4 LT	641	break;
1da177e4 LT	642	case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
7d04a335 NS	643	xfs_force_shutdown(mp,
7d04a335 NS	644	SHUTDOWN_FORCE_UMOUNT \| SHUTDOWN_LOG_IO_ERROR);
1da177e4 LT	645	break;
	646	default:
	647	return XFS_ERROR(EINVAL);
	648	}
	649
	650	return 0;
	651	}