[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(mp->m_sb.sb_blocksize, xfs_alloc,
			block, 1, mp->m_alloc_mxr[0]);
		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(mp->m_sb.sb_blocksize, xfs_alloc,
			block, 1, mp->m_alloc_mxr[0]);
		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_lazy(mp);
	s = XFS_SB_LOCK(mp);
	cnt->freedata = mp->m_sb.sb_fdblocks;
	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;
	__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;
	s = XFS_SB_LOCK(mp);

	/*
	 * If our previous reservation was larger than the current value,
	 * then move any unused blocks back to the free pool.
	 */

	if (mp->m_resblks > request) {
		lcounter = mp->m_resblks_avail - request;
		if (lcounter  > 0) {		/* release unused blocks */
			mp->m_sb.sb_fdblocks += lcounter;
			mp->m_resblks_avail -= lcounter;
		}
		mp->m_resblks = request;
	} else {
		delta = request - mp->m_resblks;
		lcounter = mp->m_sb.sb_fdblocks - delta;
		if (lcounter < 0) {
			/* We can't satisfy the request, just get what we can */
			mp->m_resblks += mp->m_sb.sb_fdblocks;
			mp->m_resblks_avail += mp->m_sb.sb_fdblocks;
			mp->m_sb.sb_fdblocks = 0;
		} else {
			mp->m_sb.sb_fdblocks = lcounter;
			mp->m_resblks = request;
			mp->m_resblks_avail += delta;
		}
	}

	outval->resblks = mp->m_resblks;
	outval->resblks_avail = mp->m_resblks_avail;
	XFS_SB_UNLOCK(mp, s);
	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;
}
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);
1da177e4 LT	253	arec = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_alloc,
1da177e4 LT	254	block, 1, mp->m_alloc_mxr[0]);
16259e7d CH	255	arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
	256	arec->ar_blockcount = cpu_to_be32(
	257	agsize - be32_to_cpu(arec->ar_startblock));
1da177e4 LT	258	error = xfs_bwrite(mp, bp);
	259	if (error) {
	260	goto error0;
	261	}
	262	/*
	263	* CNT btree root block
	264	*/
	265	bp = xfs_buf_get(mp->m_ddev_targp,
	266	XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
	267	BTOBB(mp->m_sb.sb_blocksize), 0);
	268	block = XFS_BUF_TO_SBLOCK(bp);
	269	memset(block, 0, mp->m_sb.sb_blocksize);
16259e7d	270	block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
1da177e4	271	block->bb_level = 0;
16259e7d CH	272	block->bb_numrecs = cpu_to_be16(1);
	273	block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
	274	block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
1da177e4 LT	275	arec = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_alloc,
1da177e4 LT	276	block, 1, mp->m_alloc_mxr[0]);
16259e7d CH	277	arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
	278	arec->ar_blockcount = cpu_to_be32(
	279	agsize - be32_to_cpu(arec->ar_startblock));
	280	nfree += be32_to_cpu(arec->ar_blockcount);
1da177e4 LT	281	error = xfs_bwrite(mp, bp);
	282	if (error) {
	283	goto error0;
	284	}
	285	/*
	286	* INO btree root block
	287	*/
	288	bp = xfs_buf_get(mp->m_ddev_targp,
	289	XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
	290	BTOBB(mp->m_sb.sb_blocksize), 0);
	291	block = XFS_BUF_TO_SBLOCK(bp);
	292	memset(block, 0, mp->m_sb.sb_blocksize);
16259e7d	293	block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
1da177e4 LT	294	block->bb_level = 0;
1da177e4 LT	295	block->bb_numrecs = 0;
16259e7d CH	296	block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
16259e7d CH	297	block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
1da177e4 LT	298	error = xfs_bwrite(mp, bp);
	299	if (error) {
	300	goto error0;
	301	}
	302	}
	303	xfs_trans_agblocks_delta(tp, nfree);
	304	/*
	305	* There are new blocks in the old last a.g.
	306	*/
	307	if (new) {
	308	/*
	309	* Change the agi length.
	310	*/
	311	error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
	312	if (error) {
	313	goto error0;
	314	}
	315	ASSERT(bp);
	316	agi = XFS_BUF_TO_AGI(bp);
16259e7d	317	be32_add(&agi->agi_length, new);
1da177e4	318	ASSERT(nagcount == oagcount \|\|
16259e7d	319	be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
1da177e4 LT	320	xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
	321	/*
	322	* Change agf length.
	323	*/
	324	error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
	325	if (error) {
	326	goto error0;
	327	}
	328	ASSERT(bp);
	329	agf = XFS_BUF_TO_AGF(bp);
16259e7d CH	330	be32_add(&agf->agf_length, new);
	331	ASSERT(be32_to_cpu(agf->agf_length) ==
	332	be32_to_cpu(agi->agi_length));
1da177e4 LT	333	/*
	334	* Free the new space.
	335	*/
	336	error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
16259e7d	337	be32_to_cpu(agf->agf_length) - new), new);
1da177e4 LT	338	if (error) {
	339	goto error0;
	340	}
	341	}
	342	if (nagcount > oagcount)
	343	xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
	344	if (nb > mp->m_sb.sb_dblocks)
	345	xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
	346	nb - mp->m_sb.sb_dblocks);
	347	if (nfree)
	348	xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
	349	if (dpct)
	350	xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
	351	error = xfs_trans_commit(tp, 0, NULL);
	352	if (error) {
	353	return error;
	354	}
	355	/* New allocation groups fully initialized, so update mount struct */
	356	if (nagimax)
	357	mp->m_maxagi = nagimax;
	358	if (mp->m_sb.sb_imax_pct) {
	359	__uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
	360	do_div(icount, 100);
	361	mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
	362	} else
	363	mp->m_maxicount = 0;
	364	for (agno = 1; agno < nagcount; agno++) {
	365	error = xfs_read_buf(mp, mp->m_ddev_targp,
	366	XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
	367	XFS_FSS_TO_BB(mp, 1), 0, &bp);
	368	if (error) {
	369	xfs_fs_cmn_err(CE_WARN, mp,
	370	"error %d reading secondary superblock for ag %d",
	371	error, agno);
	372	break;
	373	}
	374	sbp = XFS_BUF_TO_SBP(bp);
	375	xfs_xlatesb(sbp, &mp->m_sb, -1, XFS_SB_ALL_BITS);
	376	/*
	377	* If we get an error writing out the alternate superblocks,
	378	* just issue a warning and continue. The real work is
	379	* already done and committed.
	380	*/
	381	if (!(error = xfs_bwrite(mp, bp))) {
	382	continue;
	383	} else {
	384	xfs_fs_cmn_err(CE_WARN, mp,
	385	"write error %d updating secondary superblock for ag %d",
	386	error, agno);
	387	break; /* no point in continuing */
	388	}
	389	}
	390	return 0;
	391
	392	error0:
	393	xfs_trans_cancel(tp, XFS_TRANS_ABORT);
	394	return error;
	395	}
	396
	397	static int
	398	xfs_growfs_log_private(
	399	xfs_mount_t mp, / mount point for filesystem */
	400	xfs_growfs_log_t in) / growfs log input struct */
	401	{
402	xfs_extlen_t nb;
403
404	nb = in->newblocks;
405	if (nb < XFS_MIN_LOG_BLOCKS \|\| nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
406	return XFS_ERROR(EINVAL);
407	if (nb == mp->m_sb.sb_logblocks &&
408	in->isint == (mp->m_sb.sb_logstart != 0))
409	return XFS_ERROR(EINVAL);
410	/*
411	* Moving the log is hard, need new interfaces to sync
412	* the log first, hold off all activity while moving it.
413	* Can have shorter or longer log in the same space,
414	* or transform internal to external log or vice versa.
415	*/
416	return XFS_ERROR(ENOSYS);
417	}
418
419	/*
420	* protected versions of growfs function acquire and release locks on the mount
421	* point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
422	* XFS_IOC_FSGROWFSRT
423	*/
424
425
426	int
427	xfs_growfs_data(
428	xfs_mount_t *mp,
429	xfs_growfs_data_t *in)
430	{
431	int error;
432	if (!cpsema(&mp->m_growlock))
433	return XFS_ERROR(EWOULDBLOCK);
434	error = xfs_growfs_data_private(mp, in);
435	vsema(&mp->m_growlock);
436	return error;
437	}
438
439	int
440	xfs_growfs_log(
441	xfs_mount_t *mp,
442	xfs_growfs_log_t *in)
443	{
444	int error;
445	if (!cpsema(&mp->m_growlock))
446	return XFS_ERROR(EWOULDBLOCK);
447	error = xfs_growfs_log_private(mp, in);
448	vsema(&mp->m_growlock);
449	return error;
450	}
451
452	/*
453	* exported through ioctl XFS_IOC_FSCOUNTS
454	*/
455
456	int
457	xfs_fs_counts(
458	xfs_mount_t *mp,
459	xfs_fsop_counts_t *cnt)
460	{
461	unsigned long s;
462
8d280b98	463	xfs_icsb_sync_counters_lazy(mp);
1da177e4 LT	464	s = XFS_SB_LOCK(mp);
	465	cnt->freedata = mp->m_sb.sb_fdblocks;
	466	cnt->freertx = mp->m_sb.sb_frextents;
	467	cnt->freeino = mp->m_sb.sb_ifree;
	468	cnt->allocino = mp->m_sb.sb_icount;
	469	XFS_SB_UNLOCK(mp, s);
	470	return 0;
	471	}
	472
	473	/*
	474	* exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
	475	*
	476	* xfs_reserve_blocks is called to set m_resblks
	477	* in the in-core mount table. The number of unused reserved blocks
c41564b5	478	* is kept in m_resblks_avail.
1da177e4 LT	479	*
	480	* Reserve the requested number of blocks if available. Otherwise return
	481	* as many as possible to satisfy the request. The actual number
	482	* reserved are returned in outval
	483	*
	484	* A null inval pointer indicates that only the current reserved blocks
	485	* available should be returned no settings are changed.
	486	*/
	487
	488	int
	489	xfs_reserve_blocks(
	490	xfs_mount_t *mp,
	491	__uint64_t *inval,
	492	xfs_fsop_resblks_t *outval)
	493	{
	494	__int64_t lcounter, delta;
	495	__uint64_t request;
	496	unsigned long s;
	497
	498	/* If inval is null, report current values and return */
	499
	500	if (inval == (__uint64_t *)NULL) {
	501	outval->resblks = mp->m_resblks;
	502	outval->resblks_avail = mp->m_resblks_avail;
014c2544	503	return 0;
1da177e4 LT	504	}
	505
	506	request = *inval;
	507	s = XFS_SB_LOCK(mp);
	508
	509	/*
	510	* If our previous reservation was larger than the current value,
	511	* then move any unused blocks back to the free pool.
	512	*/
	513
	514	if (mp->m_resblks > request) {
	515	lcounter = mp->m_resblks_avail - request;
	516	if (lcounter > 0) { /* release unused blocks */
	517	mp->m_sb.sb_fdblocks += lcounter;
	518	mp->m_resblks_avail -= lcounter;
	519	}
	520	mp->m_resblks = request;
	521	} else {
	522	delta = request - mp->m_resblks;
	523	lcounter = mp->m_sb.sb_fdblocks - delta;
	524	if (lcounter < 0) {
	525	/* We can't satisfy the request, just get what we can */
	526	mp->m_resblks += mp->m_sb.sb_fdblocks;
	527	mp->m_resblks_avail += mp->m_sb.sb_fdblocks;
	528	mp->m_sb.sb_fdblocks = 0;
	529	} else {
	530	mp->m_sb.sb_fdblocks = lcounter;
	531	mp->m_resblks = request;
	532	mp->m_resblks_avail += delta;
	533	}
	534	}
	535
	536	outval->resblks = mp->m_resblks;
	537	outval->resblks_avail = mp->m_resblks_avail;
	538	XFS_SB_UNLOCK(mp, s);
014c2544	539	return 0;
1da177e4 LT	540	}
1da177e4 LT	541
e13a73f0	542	void
421ad134 NS	543	xfs_fs_log_dummy(
421ad134 NS	544	xfs_mount_t *mp)
e13a73f0	545	{
421ad134 NS	546	xfs_trans_t *tp;
421ad134 NS	547	xfs_inode_t *ip;
e13a73f0 CH	548
e13a73f0 CH	549	tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
e13a73f0 CH	550	if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) {
	551	xfs_trans_cancel(tp, 0);
	552	return;
	553	}
	554
	555	ip = mp->m_rootip;
	556	xfs_ilock(ip, XFS_ILOCK_EXCL);
	557
	558	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
	559	xfs_trans_ihold(tp, ip);
	560	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
	561	xfs_trans_set_sync(tp);
	562	xfs_trans_commit(tp, 0, NULL);
	563
	564	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	565	}
	566
1da177e4 LT	567	int
	568	xfs_fs_goingdown(
	569	xfs_mount_t *mp,
	570	__uint32_t inflags)
	571	{
	572	switch (inflags) {
	573	case XFS_FSOP_GOING_FLAGS_DEFAULT: {
b83bd138	574	struct bhv_vfs *vfsp = XFS_MTOVFS(mp);
1da177e4 LT	575	struct super_block *sb = freeze_bdev(vfsp->vfs_super->s_bdev);
1da177e4 LT	576
f33c6797	577	if (sb && !IS_ERR(sb)) {
7d04a335	578	xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
1da177e4 LT	579	thaw_bdev(sb->s_bdev, sb);
	580	}
	581
	582	break;
	583	}
	584	case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
7d04a335	585	xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
1da177e4 LT	586	break;
1da177e4 LT	587	case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
7d04a335 NS	588	xfs_force_shutdown(mp,
7d04a335 NS	589	SHUTDOWN_FORCE_UMOUNT \| SHUTDOWN_LOG_IO_ERROR);
1da177e4 LT	590	break;
	591	default:
	592	return XFS_ERROR(EINVAL);
	593	}
	594
	595	return 0;
	596	}