[mirror_ubuntu-zesty-kernel.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_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);
	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);

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