[deliverable/linux.git] / fs / xfs / xfs_fsops.c

/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_btree.h"
#include "xfs_error.h"
#include "xfs_alloc.h"
#include "xfs_ialloc.h"
#include "xfs_fsops.h"
#include "xfs_itable.h"
#include "xfs_trans_space.h"
#include "xfs_rtalloc.h"
#include "xfs_rw.h"

/*
 * File system operations
 */

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

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

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

	new = nb;	/* use new as a temporary here */
	nb_mod = do_div(new, mp->m_sb.sb_agblocks);
	nagcount = new + (nb_mod != 0);
	if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
		nagcount--;
		nb = nagcount * mp->m_sb.sb_agblocks;
		if (nb < mp->m_sb.sb_dblocks)
			return XFS_ERROR(EINVAL);
	}
	new = nb - mp->m_sb.sb_dblocks;
	oagcount = mp->m_sb.sb_agcount;
	if (nagcount > oagcount) {
		down_write(&mp->m_peraglock);
		mp->m_perag = kmem_realloc(mp->m_perag,
			sizeof(xfs_perag_t) * nagcount,
			sizeof(xfs_perag_t) * oagcount,
			KM_SLEEP);
		memset(&mp->m_perag[oagcount], 0,
			(nagcount - oagcount) * sizeof(xfs_perag_t));
		mp->m_flags |= XFS_MOUNT_32BITINODES;
		nagimax = xfs_initialize_perag(XFS_MTOVFS(mp), mp, nagcount);
		up_write(&mp->m_peraglock);
	}
	tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
	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	96	XFS_FSOP_GEOM_FLAGS_SECTOR : 0) \|
92821e2b DC	97	(xfs_sb_version_haslazysbcount(&mp->m_sb) ?
92821e2b DC	98	XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) \|
d8cc890d NS	99	(XFS_SB_VERSION_HASATTR2(&mp->m_sb) ?
d8cc890d NS	100	XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
1da177e4 LT	101	geo->logsectsize = XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
	102	mp->m_sb.sb_logsectsize : BBSIZE;
	103	geo->rtsectsize = mp->m_sb.sb_blocksize;
	104	geo->dirblocksize = mp->m_dirblksize;
	105	}
	106	if (new_version >= 4) {
	107	geo->flags \|=
	108	(XFS_SB_VERSION_HASLOGV2(&mp->m_sb) ?
	109	XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
	110	geo->logsunit = mp->m_sb.sb_logsunit;
	111	}
	112	return 0;
	113	}
	114
	115	static int
	116	xfs_growfs_data_private(
	117	xfs_mount_t mp, / mount point for filesystem */
	118	xfs_growfs_data_t in) / growfs data input struct */
	119	{
	120	xfs_agf_t *agf;
	121	xfs_agi_t *agi;
	122	xfs_agnumber_t agno;
	123	xfs_extlen_t agsize;
	124	xfs_extlen_t tmpsize;
	125	xfs_alloc_rec_t *arec;
	126	xfs_btree_sblock_t *block;
	127	xfs_buf_t *bp;
	128	int bucket;
	129	int dpct;
	130	int error;
	131	xfs_agnumber_t nagcount;
	132	xfs_agnumber_t nagimax = 0;
	133	xfs_rfsblock_t nb, nb_mod;
	134	xfs_rfsblock_t new;
	135	xfs_rfsblock_t nfree;
	136	xfs_agnumber_t oagcount;
	137	int pct;
	138	xfs_sb_t *sbp;
	139	xfs_trans_t *tp;
	140
	141	nb = in->newblocks;
	142	pct = in->imaxpct;
	143	if (nb < mp->m_sb.sb_dblocks \|\| pct < 0 \|\| pct > 100)
	144	return XFS_ERROR(EINVAL);
4cc929ee NS	145	if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
4cc929ee NS	146	return error;
1da177e4 LT	147	dpct = pct - mp->m_sb.sb_imax_pct;
	148	error = xfs_read_buf(mp, mp->m_ddev_targp,
	149	XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
	150	XFS_FSS_TO_BB(mp, 1), 0, &bp);
	151	if (error)
	152	return error;
	153	ASSERT(bp);
	154	xfs_buf_relse(bp);
	155
	156	new = nb; /* use new as a temporary here */
	157	nb_mod = do_div(new, mp->m_sb.sb_agblocks);
	158	nagcount = new + (nb_mod != 0);
	159	if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
	160	nagcount--;
	161	nb = nagcount * mp->m_sb.sb_agblocks;
	162	if (nb < mp->m_sb.sb_dblocks)
	163	return XFS_ERROR(EINVAL);
	164	}
	165	new = nb - mp->m_sb.sb_dblocks;
	166	oagcount = mp->m_sb.sb_agcount;
	167	if (nagcount > oagcount) {
	168	down_write(&mp->m_peraglock);
	169	mp->m_perag = kmem_realloc(mp->m_perag,
	170	sizeof(xfs_perag_t) * nagcount,
	171	sizeof(xfs_perag_t) * oagcount,
	172	KM_SLEEP);
	173	memset(&mp->m_perag[oagcount], 0,
	174	(nagcount - oagcount) * sizeof(xfs_perag_t));
	175	mp->m_flags \|= XFS_MOUNT_32BITINODES;
c11e2c36	176	nagimax = xfs_initialize_perag(XFS_MTOVFS(mp), mp, nagcount);
1da177e4 LT	177	up_write(&mp->m_peraglock);
	178	}
	179	tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
	180	if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
	181	XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
	182	xfs_trans_cancel(tp, 0);
	183	return error;
	184	}
	185
	186	nfree = 0;
	187	for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
	188	/*
	189	* AG freelist header block
	190	*/
	191	bp = xfs_buf_get(mp->m_ddev_targp,
	192	XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
	193	XFS_FSS_TO_BB(mp, 1), 0);
	194	agf = XFS_BUF_TO_AGF(bp);
	195	memset(agf, 0, mp->m_sb.sb_sectsize);
16259e7d CH	196	agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
	197	agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
	198	agf->agf_seqno = cpu_to_be32(agno);
1da177e4 LT	199	if (agno == nagcount - 1)
	200	agsize =
	201	nb -
	202	(agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
	203	else
	204	agsize = mp->m_sb.sb_agblocks;
16259e7d CH	205	agf->agf_length = cpu_to_be32(agsize);
	206	agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
	207	agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
	208	agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
	209	agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
1da177e4	210	agf->agf_flfirst = 0;
16259e7d	211	agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
1da177e4 LT	212	agf->agf_flcount = 0;
1da177e4 LT	213	tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
16259e7d CH	214	agf->agf_freeblks = cpu_to_be32(tmpsize);
16259e7d CH	215	agf->agf_longest = cpu_to_be32(tmpsize);
1da177e4 LT	216	error = xfs_bwrite(mp, bp);
	217	if (error) {
	218	goto error0;
	219	}
	220	/*
	221	* AG inode header block
	222	*/
	223	bp = xfs_buf_get(mp->m_ddev_targp,
	224	XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
	225	XFS_FSS_TO_BB(mp, 1), 0);
	226	agi = XFS_BUF_TO_AGI(bp);
	227	memset(agi, 0, mp->m_sb.sb_sectsize);
16259e7d CH	228	agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
	229	agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
	230	agi->agi_seqno = cpu_to_be32(agno);
	231	agi->agi_length = cpu_to_be32(agsize);
1da177e4	232	agi->agi_count = 0;
16259e7d CH	233	agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
16259e7d CH	234	agi->agi_level = cpu_to_be32(1);
1da177e4	235	agi->agi_freecount = 0;
16259e7d CH	236	agi->agi_newino = cpu_to_be32(NULLAGINO);
16259e7d CH	237	agi->agi_dirino = cpu_to_be32(NULLAGINO);
1da177e4	238	for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
16259e7d	239	agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
1da177e4 LT	240	error = xfs_bwrite(mp, bp);
	241	if (error) {
	242	goto error0;
	243	}
	244	/*
	245	* BNO btree root block
	246	*/
	247	bp = xfs_buf_get(mp->m_ddev_targp,
	248	XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
	249	BTOBB(mp->m_sb.sb_blocksize), 0);
	250	block = XFS_BUF_TO_SBLOCK(bp);
	251	memset(block, 0, mp->m_sb.sb_blocksize);
16259e7d	252	block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
1da177e4	253	block->bb_level = 0;
16259e7d CH	254	block->bb_numrecs = cpu_to_be16(1);
	255	block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
	256	block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
2c36dded	257	arec = XFS_BTREE_REC_ADDR(xfs_alloc, block, 1);
16259e7d CH	258	arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
	259	arec->ar_blockcount = cpu_to_be32(
	260	agsize - be32_to_cpu(arec->ar_startblock));
1da177e4 LT	261	error = xfs_bwrite(mp, bp);
	262	if (error) {
	263	goto error0;
	264	}
	265	/*
	266	* CNT btree root block
	267	*/
	268	bp = xfs_buf_get(mp->m_ddev_targp,
	269	XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
	270	BTOBB(mp->m_sb.sb_blocksize), 0);
	271	block = XFS_BUF_TO_SBLOCK(bp);
	272	memset(block, 0, mp->m_sb.sb_blocksize);
16259e7d	273	block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
1da177e4	274	block->bb_level = 0;
16259e7d CH	275	block->bb_numrecs = cpu_to_be16(1);
	276	block->bb_leftsib = cpu_to_be32(NULLAGBLOCK);
	277	block->bb_rightsib = cpu_to_be32(NULLAGBLOCK);
2c36dded	278	arec = XFS_BTREE_REC_ADDR(xfs_alloc, block, 1);
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);
1c72bf90	353	error = xfs_trans_commit(tp, 0);
1da177e4 LT	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
dbcabad1	465	xfs_icsb_sync_counters_flags(mp, XFS_ICSB_LAZY_COUNT);
1da177e4	466	s = XFS_SB_LOCK(mp);
4be536de	467	cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
1da177e4 LT	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	{
dbcabad1	496	__int64_t lcounter, delta, fdblks_delta;
1da177e4 LT	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;
dbcabad1 DC	509
	510	/*
	511	* With per-cpu counters, this becomes an interesting
	512	* problem. we needto work out if we are freeing or allocation
	513	* blocks first, then we can do the modification as necessary.
	514	*
	515	* We do this under the XFS_SB_LOCK so that if we are near
	516	* ENOSPC, we will hold out any changes while we work out
	517	* what to do. This means that the amount of free space can
	518	* change while we do this, so we need to retry if we end up
	519	* trying to reserve more space than is available.
	520	*
	521	* We also use the xfs_mod_incore_sb() interface so that we
	522	* don't have to care about whether per cpu counter are
	523	* enabled, disabled or even compiled in....
	524	*/
	525	retry:
1da177e4	526	s = XFS_SB_LOCK(mp);
dbcabad1	527	xfs_icsb_sync_counters_flags(mp, XFS_ICSB_SB_LOCKED);
1da177e4 LT	528
	529	/*
	530	* If our previous reservation was larger than the current value,
	531	* then move any unused blocks back to the free pool.
	532	*/
dbcabad1	533	fdblks_delta = 0;
1da177e4 LT	534	if (mp->m_resblks > request) {
	535	lcounter = mp->m_resblks_avail - request;
	536	if (lcounter > 0) { /* release unused blocks */
dbcabad1	537	fdblks_delta = lcounter;
1da177e4 LT	538	mp->m_resblks_avail -= lcounter;
	539	}
	540	mp->m_resblks = request;
	541	} else {
4be536de DC	542	__int64_t free;
	543
	544	free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
dbcabad1 DC	545	if (!free)
	546	goto out; /* ENOSPC and fdblks_delta = 0 */
	547
1da177e4	548	delta = request - mp->m_resblks;
4be536de	549	lcounter = free - delta;
1da177e4 LT	550	if (lcounter < 0) {
1da177e4 LT	551	/* We can't satisfy the request, just get what we can */
4be536de DC	552	mp->m_resblks += free;
4be536de DC	553	mp->m_resblks_avail += free;
dbcabad1	554	fdblks_delta = -free;
4be536de	555	mp->m_sb.sb_fdblocks = XFS_ALLOC_SET_ASIDE(mp);
1da177e4	556	} else {
dbcabad1	557	fdblks_delta = -delta;
4be536de DC	558	mp->m_sb.sb_fdblocks =
4be536de DC	559	lcounter + XFS_ALLOC_SET_ASIDE(mp);
1da177e4 LT	560	mp->m_resblks = request;
	561	mp->m_resblks_avail += delta;
	562	}
	563	}
dbcabad1	564	out:
1da177e4 LT	565	outval->resblks = mp->m_resblks;
	566	outval->resblks_avail = mp->m_resblks_avail;
	567	XFS_SB_UNLOCK(mp, s);
dbcabad1 DC	568
	569	if (fdblks_delta) {
	570	/*
	571	* If we are putting blocks back here, m_resblks_avail is
	572	* already at it's max so this will put it in the free pool.
	573	*
	574	* If we need space, we'll either succeed in getting it
	575	* from the free block count or we'll get an enospc. If
	576	* we get a ENOSPC, it means things changed while we were
	577	* calculating fdblks_delta and so we should try again to
	578	* see if there is anything left to reserve.
	579	*
	580	* Don't set the reserved flag here - we don't want to reserve
	581	* the extra reserve blocks from the reserve.....
	582	*/
	583	int error;
	584	error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0);
	585	if (error == ENOSPC)
	586	goto retry;
	587	}
	588
014c2544	589	return 0;
1da177e4 LT	590	}
1da177e4 LT	591
e13a73f0	592	void
421ad134 NS	593	xfs_fs_log_dummy(
421ad134 NS	594	xfs_mount_t *mp)
e13a73f0	595	{
421ad134 NS	596	xfs_trans_t *tp;
421ad134 NS	597	xfs_inode_t *ip;
e13a73f0 CH	598
e13a73f0 CH	599	tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
e13a73f0 CH	600	if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) {
	601	xfs_trans_cancel(tp, 0);
	602	return;
	603	}
	604
	605	ip = mp->m_rootip;
	606	xfs_ilock(ip, XFS_ILOCK_EXCL);
	607
	608	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
	609	xfs_trans_ihold(tp, ip);
	610	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
	611	xfs_trans_set_sync(tp);
1c72bf90	612	xfs_trans_commit(tp, 0);
e13a73f0 CH	613
	614	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	615	}
	616
1da177e4 LT	617	int
	618	xfs_fs_goingdown(
	619	xfs_mount_t *mp,
	620	__uint32_t inflags)
	621	{
	622	switch (inflags) {
	623	case XFS_FSOP_GOING_FLAGS_DEFAULT: {
b83bd138	624	struct bhv_vfs *vfsp = XFS_MTOVFS(mp);
1da177e4 LT	625	struct super_block *sb = freeze_bdev(vfsp->vfs_super->s_bdev);
1da177e4 LT	626
f33c6797	627	if (sb && !IS_ERR(sb)) {
7d04a335	628	xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
1da177e4 LT	629	thaw_bdev(sb->s_bdev, sb);
	630	}
	631
	632	break;
	633	}
	634	case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
7d04a335	635	xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
1da177e4 LT	636	break;
1da177e4 LT	637	case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
7d04a335 NS	638	xfs_force_shutdown(mp,
7d04a335 NS	639	SHUTDOWN_FORCE_UMOUNT \| SHUTDOWN_LOG_IO_ERROR);
1da177e4 LT	640	break;
	641	default:
	642	return XFS_ERROR(EINVAL);
	643	}
	644
	645	return 0;
	646	}