fs/xfs/scrub/rtsummary_repair.c

Source file repositories/reference/linux-study-clean/fs/xfs/scrub/rtsummary_repair.c

File Facts

System
Linux kernel
Corpus path
fs/xfs/scrub/rtsummary_repair.c
Extension
.c
Size
5123 bytes
Lines
187
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

// 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_platform.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 = mp->m_rsumblocks;
	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 = mp;
	rts->args.tp = sc->tp;
	rts->args.rtg = sc->sr.rtg;
	rts->args.sumbp = bp;
	ondisk = xfs_rsumblock_infoptr(&rts->args, 0);
	rts->args.sumbp = NULL;

	error = xfsum_copyout(sc, rts->prep_wordoff, ondisk, mp->m_blockwsize);
	if (error)
		return error;

	if (xfs_has_rtgroups(sc->mp)) {

Annotation

Implementation Notes