[net-next-2.6.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_dir.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_dir_sf.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);
	atomic_inc(&mp->m_active_trans);
	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 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, XFS_FORCE_UMOUNT);
			thaw_bdev(sb->s_bdev, sb);
		}
	
		break;
	}
	case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
		xfs_force_shutdown(mp, XFS_FORCE_UMOUNT);
		break;
	case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
		xfs_force_shutdown(mp, XFS_FORCE_UMOUNT|XFS_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"
1da177e4	27	#include "xfs_dir.h"
a844f451	28	#include "xfs_dir2.h"
1da177e4 LT	29	#include "xfs_dmapi.h"
1da177e4 LT	30	#include "xfs_mount.h"
1da177e4	31	#include "xfs_bmap_btree.h"
a844f451	32	#include "xfs_alloc_btree.h"
1da177e4	33	#include "xfs_ialloc_btree.h"
a844f451 NS	34	#include "xfs_dir_sf.h"
	35	#include "xfs_dir2_sf.h"
	36	#include "xfs_attr_sf.h"
	37	#include "xfs_dinode.h"
	38	#include "xfs_inode.h"
	39	#include "xfs_inode_item.h"
1da177e4 LT	40	#include "xfs_btree.h"
	41	#include "xfs_error.h"
	42	#include "xfs_alloc.h"
	43	#include "xfs_ialloc.h"
	44	#include "xfs_fsops.h"
	45	#include "xfs_itable.h"
1da177e4 LT	46	#include "xfs_trans_space.h"
1da177e4 LT	47	#include "xfs_rtalloc.h"
a844f451	48	#include "xfs_rw.h"
1da177e4 LT	49
	50	/*
	51	* File system operations
	52	*/
	53
	54	int
	55	xfs_fs_geometry(
	56	xfs_mount_t *mp,
	57	xfs_fsop_geom_t *geo,
	58	int new_version)
	59	{
	60	geo->blocksize = mp->m_sb.sb_blocksize;
	61	geo->rtextsize = mp->m_sb.sb_rextsize;
	62	geo->agblocks = mp->m_sb.sb_agblocks;
	63	geo->agcount = mp->m_sb.sb_agcount;
	64	geo->logblocks = mp->m_sb.sb_logblocks;
	65	geo->sectsize = mp->m_sb.sb_sectsize;
	66	geo->inodesize = mp->m_sb.sb_inodesize;
	67	geo->imaxpct = mp->m_sb.sb_imax_pct;
	68	geo->datablocks = mp->m_sb.sb_dblocks;
	69	geo->rtblocks = mp->m_sb.sb_rblocks;
	70	geo->rtextents = mp->m_sb.sb_rextents;
	71	geo->logstart = mp->m_sb.sb_logstart;
	72	ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
	73	memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
	74	if (new_version >= 2) {
	75	geo->sunit = mp->m_sb.sb_unit;
	76	geo->swidth = mp->m_sb.sb_width;
	77	}
	78	if (new_version >= 3) {
	79	geo->version = XFS_FSOP_GEOM_VERSION;
	80	geo->flags =
	81	(XFS_SB_VERSION_HASATTR(&mp->m_sb) ?
	82	XFS_FSOP_GEOM_FLAGS_ATTR : 0) \|
	83	(XFS_SB_VERSION_HASNLINK(&mp->m_sb) ?
	84	XFS_FSOP_GEOM_FLAGS_NLINK : 0) \|
	85	(XFS_SB_VERSION_HASQUOTA(&mp->m_sb) ?
	86	XFS_FSOP_GEOM_FLAGS_QUOTA : 0) \|
	87	(XFS_SB_VERSION_HASALIGN(&mp->m_sb) ?
	88	XFS_FSOP_GEOM_FLAGS_IALIGN : 0) \|
	89	(XFS_SB_VERSION_HASDALIGN(&mp->m_sb) ?
	90	XFS_FSOP_GEOM_FLAGS_DALIGN : 0) \|
	91	(XFS_SB_VERSION_HASSHARED(&mp->m_sb) ?
	92	XFS_FSOP_GEOM_FLAGS_SHARED : 0) \|
	93	(XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb) ?
	94	XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) \|
	95	(XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
	96	XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) \|
	97	(XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
d8cc890d NS	98	XFS_FSOP_GEOM_FLAGS_SECTOR : 0) \|
	99	(XFS_SB_VERSION_HASATTR2(&mp->m_sb) ?
	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);
	145	dpct = pct - mp->m_sb.sb_imax_pct;
	146	error = xfs_read_buf(mp, mp->m_ddev_targp,
	147	XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
	148	XFS_FSS_TO_BB(mp, 1), 0, &bp);
	149	if (error)
	150	return error;
	151	ASSERT(bp);
	152	xfs_buf_relse(bp);
	153
	154	new = nb; /* use new as a temporary here */
	155	nb_mod = do_div(new, mp->m_sb.sb_agblocks);
	156	nagcount = new + (nb_mod != 0);
	157	if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
	158	nagcount--;
	159	nb = nagcount * mp->m_sb.sb_agblocks;
	160	if (nb < mp->m_sb.sb_dblocks)
	161	return XFS_ERROR(EINVAL);
	162	}
	163	new = nb - mp->m_sb.sb_dblocks;
	164	oagcount = mp->m_sb.sb_agcount;
165	if (nagcount > oagcount) {
166	down_write(&mp->m_peraglock);
167	mp->m_perag = kmem_realloc(mp->m_perag,
168	sizeof(xfs_perag_t) * nagcount,
169	sizeof(xfs_perag_t) * oagcount,
170	KM_SLEEP);
171	memset(&mp->m_perag[oagcount], 0,
172	(nagcount - oagcount) * sizeof(xfs_perag_t));
173	mp->m_flags \|= XFS_MOUNT_32BITINODES;
c11e2c36	174	nagimax = xfs_initialize_perag(XFS_MTOVFS(mp), mp, nagcount);
1da177e4 LT	175	up_write(&mp->m_peraglock);
	176	}
	177	tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
	178	if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
	179	XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
	180	xfs_trans_cancel(tp, 0);
	181	return error;
	182	}
	183
	184	nfree = 0;
	185	for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
	186	/*
	187	* AG freelist header block
	188	*/
	189	bp = xfs_buf_get(mp->m_ddev_targp,
	190	XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
	191	XFS_FSS_TO_BB(mp, 1), 0);
	192	agf = XFS_BUF_TO_AGF(bp);
	193	memset(agf, 0, mp->m_sb.sb_sectsize);
16259e7d CH	194	agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
	195	agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
	196	agf->agf_seqno = cpu_to_be32(agno);
1da177e4 LT	197	if (agno == nagcount - 1)
	198	agsize =
	199	nb -
	200	(agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
	201	else
	202	agsize = mp->m_sb.sb_agblocks;
16259e7d CH	203	agf->agf_length = cpu_to_be32(agsize);
	204	agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
	205	agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
	206	agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
	207	agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
1da177e4	208	agf->agf_flfirst = 0;
16259e7d	209	agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
1da177e4 LT	210	agf->agf_flcount = 0;
1da177e4 LT	211	tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
16259e7d CH	212	agf->agf_freeblks = cpu_to_be32(tmpsize);
16259e7d CH	213	agf->agf_longest = cpu_to_be32(tmpsize);
1da177e4 LT	214	error = xfs_bwrite(mp, bp);
	215	if (error) {
	216	goto error0;
	217	}
	218	/*
	219	* AG inode header block
	220	*/
	221	bp = xfs_buf_get(mp->m_ddev_targp,
	222	XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
	223	XFS_FSS_TO_BB(mp, 1), 0);
	224	agi = XFS_BUF_TO_AGI(bp);
	225	memset(agi, 0, mp->m_sb.sb_sectsize);
16259e7d CH	226	agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
	227	agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
	228	agi->agi_seqno = cpu_to_be32(agno);
	229	agi->agi_length = cpu_to_be32(agsize);
1da177e4	230	agi->agi_count = 0;
16259e7d CH	231	agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
16259e7d CH	232	agi->agi_level = cpu_to_be32(1);
1da177e4	233	agi->agi_freecount = 0;
16259e7d CH	234	agi->agi_newino = cpu_to_be32(NULLAGINO);
16259e7d CH	235	agi->agi_dirino = cpu_to_be32(NULLAGINO);
1da177e4	236	for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
16259e7d	237	agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
1da177e4 LT	238	error = xfs_bwrite(mp, bp);
	239	if (error) {
	240	goto error0;
	241	}
	242	/*
	243	* BNO btree root block
	244	*/
	245	bp = xfs_buf_get(mp->m_ddev_targp,
	246	XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
	247	BTOBB(mp->m_sb.sb_blocksize), 0);
	248	block = XFS_BUF_TO_SBLOCK(bp);
	249	memset(block, 0, mp->m_sb.sb_blocksize);
16259e7d	250	block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
1da177e4	251	block->bb_level = 0;
16259e7d CH	252	block->bb_numrecs = cpu_to_be16(1);
	253	block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
	254	block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
1da177e4 LT	255	arec = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_alloc,
1da177e4 LT	256	block, 1, mp->m_alloc_mxr[0]);
16259e7d CH	257	arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
	258	arec->ar_blockcount = cpu_to_be32(
	259	agsize - be32_to_cpu(arec->ar_startblock));
1da177e4 LT	260	error = xfs_bwrite(mp, bp);
	261	if (error) {
	262	goto error0;
	263	}
	264	/*
	265	* CNT btree root block
	266	*/
	267	bp = xfs_buf_get(mp->m_ddev_targp,
	268	XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
	269	BTOBB(mp->m_sb.sb_blocksize), 0);
	270	block = XFS_BUF_TO_SBLOCK(bp);
	271	memset(block, 0, mp->m_sb.sb_blocksize);
16259e7d	272	block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
1da177e4	273	block->bb_level = 0;
16259e7d CH	274	block->bb_numrecs = cpu_to_be16(1);
	275	block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
	276	block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
1da177e4 LT	277	arec = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_alloc,
1da177e4 LT	278	block, 1, mp->m_alloc_mxr[0]);
16259e7d CH	279	arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
	280	arec->ar_blockcount = cpu_to_be32(
	281	agsize - be32_to_cpu(arec->ar_startblock));
	282	nfree += be32_to_cpu(arec->ar_blockcount);
1da177e4 LT	283	error = xfs_bwrite(mp, bp);
	284	if (error) {
	285	goto error0;
	286	}
	287	/*
	288	* INO btree root block
	289	*/
	290	bp = xfs_buf_get(mp->m_ddev_targp,
	291	XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
	292	BTOBB(mp->m_sb.sb_blocksize), 0);
	293	block = XFS_BUF_TO_SBLOCK(bp);
	294	memset(block, 0, mp->m_sb.sb_blocksize);
16259e7d	295	block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
1da177e4 LT	296	block->bb_level = 0;
1da177e4 LT	297	block->bb_numrecs = 0;
16259e7d CH	298	block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
16259e7d CH	299	block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
1da177e4 LT	300	error = xfs_bwrite(mp, bp);
	301	if (error) {
	302	goto error0;
	303	}
	304	}
	305	xfs_trans_agblocks_delta(tp, nfree);
	306	/*
	307	* There are new blocks in the old last a.g.
	308	*/
	309	if (new) {
	310	/*
	311	* Change the agi length.
	312	*/
	313	error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
	314	if (error) {
	315	goto error0;
	316	}
	317	ASSERT(bp);
	318	agi = XFS_BUF_TO_AGI(bp);
16259e7d	319	be32_add(&agi->agi_length, new);
1da177e4	320	ASSERT(nagcount == oagcount \|\|
16259e7d	321	be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
1da177e4 LT	322	xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
	323	/*
	324	* Change agf length.
	325	*/
	326	error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
	327	if (error) {
	328	goto error0;
	329	}
	330	ASSERT(bp);
	331	agf = XFS_BUF_TO_AGF(bp);
16259e7d CH	332	be32_add(&agf->agf_length, new);
	333	ASSERT(be32_to_cpu(agf->agf_length) ==
	334	be32_to_cpu(agi->agi_length));
1da177e4 LT	335	/*
	336	* Free the new space.
	337	*/
	338	error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
16259e7d	339	be32_to_cpu(agf->agf_length) - new), new);
1da177e4 LT	340	if (error) {
	341	goto error0;
	342	}
	343	}
	344	if (nagcount > oagcount)
	345	xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
	346	if (nb > mp->m_sb.sb_dblocks)
	347	xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
	348	nb - mp->m_sb.sb_dblocks);
	349	if (nfree)
	350	xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
	351	if (dpct)
	352	xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
	353	error = xfs_trans_commit(tp, 0, NULL);
	354	if (error) {
	355	return error;
	356	}
	357	/* New allocation groups fully initialized, so update mount struct */
	358	if (nagimax)
	359	mp->m_maxagi = nagimax;
	360	if (mp->m_sb.sb_imax_pct) {
	361	__uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
	362	do_div(icount, 100);
	363	mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
	364	} else
	365	mp->m_maxicount = 0;
	366	for (agno = 1; agno < nagcount; agno++) {
	367	error = xfs_read_buf(mp, mp->m_ddev_targp,
	368	XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
	369	XFS_FSS_TO_BB(mp, 1), 0, &bp);
	370	if (error) {
	371	xfs_fs_cmn_err(CE_WARN, mp,
	372	"error %d reading secondary superblock for ag %d",
	373	error, agno);
	374	break;
	375	}
	376	sbp = XFS_BUF_TO_SBP(bp);
	377	xfs_xlatesb(sbp, &mp->m_sb, -1, XFS_SB_ALL_BITS);
	378	/*
	379	* If we get an error writing out the alternate superblocks,
	380	* just issue a warning and continue. The real work is
	381	* already done and committed.
	382	*/
	383	if (!(error = xfs_bwrite(mp, bp))) {
	384	continue;
	385	} else {
	386	xfs_fs_cmn_err(CE_WARN, mp,
	387	"write error %d updating secondary superblock for ag %d",
	388	error, agno);
	389	break; /* no point in continuing */
	390	}
	391	}
	392	return 0;
	393
	394	error0:
	395	xfs_trans_cancel(tp, XFS_TRANS_ABORT);
	396	return error;
	397	}
	398
	399	static int
	400	xfs_growfs_log_private(
	401	xfs_mount_t mp, / mount point for filesystem */
	402	xfs_growfs_log_t in) / growfs log input struct */
	403	{
404	xfs_extlen_t nb;
405
406	nb = in->newblocks;
407	if (nb < XFS_MIN_LOG_BLOCKS \|\| nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
408	return XFS_ERROR(EINVAL);
409	if (nb == mp->m_sb.sb_logblocks &&
410	in->isint == (mp->m_sb.sb_logstart != 0))
411	return XFS_ERROR(EINVAL);
412	/*
413	* Moving the log is hard, need new interfaces to sync
414	* the log first, hold off all activity while moving it.
415	* Can have shorter or longer log in the same space,
416	* or transform internal to external log or vice versa.
417	*/
418	return XFS_ERROR(ENOSYS);
419	}
420
421	/*
422	* protected versions of growfs function acquire and release locks on the mount
423	* point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
424	* XFS_IOC_FSGROWFSRT
425	*/
426
427
428	int
429	xfs_growfs_data(
430	xfs_mount_t *mp,
431	xfs_growfs_data_t *in)
432	{
433	int error;
434	if (!cpsema(&mp->m_growlock))
435	return XFS_ERROR(EWOULDBLOCK);
436	error = xfs_growfs_data_private(mp, in);
437	vsema(&mp->m_growlock);
438	return error;
439	}
440
441	int
442	xfs_growfs_log(
443	xfs_mount_t *mp,
444	xfs_growfs_log_t *in)
445	{
446	int error;
447	if (!cpsema(&mp->m_growlock))
448	return XFS_ERROR(EWOULDBLOCK);
449	error = xfs_growfs_log_private(mp, in);
450	vsema(&mp->m_growlock);
451	return error;
452	}
453
454	/*
455	* exported through ioctl XFS_IOC_FSCOUNTS
456	*/
457
458	int
459	xfs_fs_counts(
460	xfs_mount_t *mp,
461	xfs_fsop_counts_t *cnt)
462	{
463	unsigned long s;
464
8d280b98	465	xfs_icsb_sync_counters_lazy(mp);
1da177e4 LT	466	s = XFS_SB_LOCK(mp);
	467	cnt->freedata = mp->m_sb.sb_fdblocks;
	468	cnt->freertx = mp->m_sb.sb_frextents;
	469	cnt->freeino = mp->m_sb.sb_ifree;
	470	cnt->allocino = mp->m_sb.sb_icount;
	471	XFS_SB_UNLOCK(mp, s);
	472	return 0;
	473	}
	474
	475	/*
	476	* exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
	477	*
	478	* xfs_reserve_blocks is called to set m_resblks
	479	* in the in-core mount table. The number of unused reserved blocks
c41564b5	480	* is kept in m_resblks_avail.
1da177e4 LT	481	*
	482	* Reserve the requested number of blocks if available. Otherwise return
	483	* as many as possible to satisfy the request. The actual number
	484	* reserved are returned in outval
	485	*
	486	* A null inval pointer indicates that only the current reserved blocks
	487	* available should be returned no settings are changed.
	488	*/
	489
	490	int
	491	xfs_reserve_blocks(
	492	xfs_mount_t *mp,
	493	__uint64_t *inval,
	494	xfs_fsop_resblks_t *outval)
	495	{
	496	__int64_t lcounter, delta;
	497	__uint64_t request;
	498	unsigned long s;
	499
	500	/* If inval is null, report current values and return */
	501
	502	if (inval == (__uint64_t *)NULL) {
	503	outval->resblks = mp->m_resblks;
	504	outval->resblks_avail = mp->m_resblks_avail;
014c2544	505	return 0;
1da177e4 LT	506	}
	507
	508	request = *inval;
	509	s = XFS_SB_LOCK(mp);
	510
	511	/*
	512	* If our previous reservation was larger than the current value,
	513	* then move any unused blocks back to the free pool.
	514	*/
	515
	516	if (mp->m_resblks > request) {
	517	lcounter = mp->m_resblks_avail - request;
	518	if (lcounter > 0) { /* release unused blocks */
	519	mp->m_sb.sb_fdblocks += lcounter;
	520	mp->m_resblks_avail -= lcounter;
	521	}
	522	mp->m_resblks = request;
	523	} else {
	524	delta = request - mp->m_resblks;
	525	lcounter = mp->m_sb.sb_fdblocks - delta;
	526	if (lcounter < 0) {
	527	/* We can't satisfy the request, just get what we can */
	528	mp->m_resblks += mp->m_sb.sb_fdblocks;
	529	mp->m_resblks_avail += mp->m_sb.sb_fdblocks;
	530	mp->m_sb.sb_fdblocks = 0;
	531	} else {
	532	mp->m_sb.sb_fdblocks = lcounter;
	533	mp->m_resblks = request;
	534	mp->m_resblks_avail += delta;
	535	}
	536	}
	537
	538	outval->resblks = mp->m_resblks;
	539	outval->resblks_avail = mp->m_resblks_avail;
	540	XFS_SB_UNLOCK(mp, s);
014c2544	541	return 0;
1da177e4 LT	542	}
1da177e4 LT	543
e13a73f0 CH	544	void
	545	xfs_fs_log_dummy(xfs_mount_t *mp)
	546	{
	547	xfs_trans_t *tp;
	548	xfs_inode_t *ip;
	549
	550
	551	tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
	552	atomic_inc(&mp->m_active_trans);
	553	if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) {
	554	xfs_trans_cancel(tp, 0);
	555	return;
	556	}
	557
	558	ip = mp->m_rootip;
	559	xfs_ilock(ip, XFS_ILOCK_EXCL);
	560
	561	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
	562	xfs_trans_ihold(tp, ip);
	563	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
	564	xfs_trans_set_sync(tp);
	565	xfs_trans_commit(tp, 0, NULL);
	566
	567	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	568	}
	569
1da177e4 LT	570	int
	571	xfs_fs_goingdown(
	572	xfs_mount_t *mp,
	573	__uint32_t inflags)
	574	{
	575	switch (inflags) {
	576	case XFS_FSOP_GOING_FLAGS_DEFAULT: {
	577	struct vfs *vfsp = XFS_MTOVFS(mp);
	578	struct super_block *sb = freeze_bdev(vfsp->vfs_super->s_bdev);
	579
f33c6797	580	if (sb && !IS_ERR(sb)) {
1da177e4 LT	581	xfs_force_shutdown(mp, XFS_FORCE_UMOUNT);
	582	thaw_bdev(sb->s_bdev, sb);
	583	}
	584
	585	break;
	586	}
	587	case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
	588	xfs_force_shutdown(mp, XFS_FORCE_UMOUNT);
	589	break;
	590	case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
	591	xfs_force_shutdown(mp, XFS_FORCE_UMOUNT\|XFS_LOG_IO_ERROR);
	592	break;
	593	default:
	594	return XFS_ERROR(EINVAL);
	595	}
	596
	597	return 0;
	598	}