linux_kernel/fs/xfs/scrub/agheader_repair.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2018 Oracle.  All Rights Reserved.
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 */
#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_defer.h"
#include "xfs_btree.h"
#include "xfs_bit.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_inode.h"
#include "xfs_alloc.h"
#include "xfs_ialloc.h"
#include "xfs_rmap.h"
#include "scrub/xfs_scrub.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/trace.h"

/* Superblock */

/* Repair the superblock. */
int
xfs_repair_superblock(
	struct xfs_scrub_context	*sc)
{
	struct xfs_mount		*mp = sc->mp;
	struct xfs_buf			*bp;
	xfs_agnumber_t			agno;
	int				error;

	/* Don't try to repair AG 0's sb; let xfs_repair deal with it. */
	agno = sc->sm->sm_agno;
	if (agno == 0)
		return -EOPNOTSUPP;

	error = xfs_sb_get_secondary(mp, sc->tp, agno, &bp);
	if (error)
		return error;

	/* Copy AG 0's superblock to this one. */
	xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
	xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);

	/* Write this to disk. */
	xfs_trans_buf_set_type(sc->tp, bp, XFS_BLFT_SB_BUF);
	xfs_trans_log_buf(sc->tp, bp, 0, BBTOB(bp->b_length) - 1);
	return error;
}