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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2020-2024 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_btree.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_rtalloc.h"
#include "xfs_inode.h"
#include "xfs_bit.h"
#include "xfs_bmap.h"
#include "xfs_bmap_btree.h"
#include "xfs_exchmaps.h"
#include "xfs_rtbitmap.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/trace.h"
#include "scrub/repair.h"
#include "scrub/tempfile.h"
#include "scrub/tempexch.h"
#include "scrub/reap.h"
#include "scrub/xfile.h"
#include "scrub/rtsummary.h"
/* Set us up to repair the rtsummary file. */
int
xrep_setup_rtsummary(
struct xfs_scrub *sc,
struct xchk_rtsummary *rts)
{
struct xfs_mount *mp = sc->mp;
unsigned long long blocks;
int error;
error = xrep_tempfile_create(sc, S_IFREG);
if (error)
return error;
/*
* If we're doing a repair, we reserve enough blocks to write out a
* completely new summary file, plus twice as many blocks as we would
* need if we can only allocate one block per data fork mapping. This
* should cover the preallocation of the temporary file and exchanging
* the extent mappings.
*
* We cannot use xfs_exchmaps_estimate because we have not yet
* constructed the replacement rtsummary and therefore do not know how
* many extents it will use. By the time we do, we will have a dirty
* transaction (which we cannot drop because we cannot drop the
* rtsummary ILOCK) and cannot ask for more reservation.
*/
blocks = XFS_B_TO_FSB(mp, mp->m_rsumsize);
blocks += xfs_bmbt_calc_size(mp, blocks) * 2;
if (blocks > UINT_MAX)
return -EOPNOTSUPP;
rts->resblks += blocks;
return 0;
}
static int
xrep_rtsummary_prep_buf(
struct xfs_scrub *sc,
struct xfs_buf *bp,
void *data)
{
struct xchk_rtsummary *rts = data;
struct xfs_mount *mp = sc->mp;
union xfs_suminfo_raw *ondisk;
int error;
rts->args.mp = sc->mp;
rts->args.tp = sc->tp;
rts->args.sumbp = bp;
ondisk = xfs_rsumblock_infoptr(&rts->args, 0);
rts->args.sumbp = NULL;
bp->b_ops = &xfs_rtbuf_ops;
error = xfsum_copyout(sc, rts->prep_wordoff, ondisk, mp->m_blockwsize);
if (error)
return error;
rts->prep_wordoff += mp->m_blockwsize;
xfs_trans_buf_set_type(sc->tp, bp, XFS_BLFT_RTSUMMARY_BUF);
return 0;
}
/* Repair the realtime summary. */
int
xrep_rtsummary(
struct xfs_scrub *sc)
{
struct xchk_rtsummary *rts = sc->buf;
struct xfs_mount *mp = sc->mp;
xfs_filblks_t rsumblocks;
int error;
/* We require the rmapbt to rebuild anything. */
if (!xfs_has_rmapbt(mp))
return -EOPNOTSUPP;
/* We require atomic file exchange range to rebuild anything. */
if (!xfs_has_exchange_range(mp))
return -EOPNOTSUPP;
/* Walk away if we disagree on the size of the rt bitmap. */
if (rts->rbmblocks != mp->m_sb.sb_rbmblocks)
return 0;
/* Make sure any problems with the fork are fixed. */
error = xrep_metadata_inode_forks(sc);
if (error)
return error;
/*
* Try to take ILOCK_EXCL of the temporary file. We had better be the
* only ones holding onto this inode, but we can't block while holding
* the rtsummary file's ILOCK_EXCL.
*/
while (!xrep_tempfile_ilock_nowait(sc)) {
if (xchk_should_terminate(sc, &error))
return error;
delay(1);
}
/* Make sure we have space allocated for the entire summary file. */
rsumblocks = XFS_B_TO_FSB(mp, rts->rsumsize);
xfs_trans_ijoin(sc->tp, sc->ip, 0);
xfs_trans_ijoin(sc->tp, sc->tempip, 0);
error = xrep_tempfile_prealloc(sc, 0, rsumblocks);
if (error)
return error;
/* Last chance to abort before we start committing fixes. */
if (xchk_should_terminate(sc, &error))
return error;
/* Copy the rtsummary file that we generated. */
error = xrep_tempfile_copyin(sc, 0, rsumblocks,
xrep_rtsummary_prep_buf, rts);
if (error)
return error;
error = xrep_tempfile_set_isize(sc, rts->rsumsize);
if (error)
return error;
/*
* Now exchange the contents. Nothing in repair uses the temporary
* buffer, so we can reuse it for the tempfile exchrange information.
*/
error = xrep_tempexch_trans_reserve(sc, XFS_DATA_FORK, &rts->tempexch);
if (error)
return error;
error = xrep_tempexch_contents(sc, &rts->tempexch);
if (error)
return error;
/* Reset incore state and blow out the summary cache. */
if (mp->m_rsum_cache)
memset(mp->m_rsum_cache, 0xFF, mp->m_sb.sb_rbmblocks);
mp->m_rsumlevels = rts->rsumlevels;
mp->m_rsumsize = rts->rsumsize;
/* Free the old rtsummary blocks if they're not in use. */
return xrep_reap_ifork(sc, sc->tempip, XFS_DATA_FORK);
}
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