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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2020-2023 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_inode.h"
#include "xfs_bit.h"
#include "xfs_bmap.h"
#include "xfs_bmap_btree.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/trace.h"
#include "scrub/repair.h"
#include "scrub/xfile.h"
#include "scrub/rtbitmap.h"
/* Set up to repair the realtime bitmap file metadata. */
int
xrep_setup_rtbitmap(
struct xfs_scrub *sc,
struct xchk_rtbitmap *rtb)
{
struct xfs_mount *mp = sc->mp;
unsigned long long blocks = 0;
/*
* Reserve enough blocks to write out a completely new bmbt for a
* maximally fragmented bitmap file. We do not hold the rtbitmap
* ILOCK yet, so this is entirely speculative.
*/
blocks = xfs_bmbt_calc_size(mp, mp->m_sb.sb_rbmblocks);
if (blocks > UINT_MAX)
return -EOPNOTSUPP;
rtb->resblks += blocks;
return 0;
}
/*
* Make sure that the given range of the data fork of the realtime file is
* mapped to written blocks. The caller must ensure that the inode is joined
* to the transaction.
*/
STATIC int
xrep_rtbitmap_data_mappings(
struct xfs_scrub *sc,
xfs_filblks_t len)
{
struct xfs_bmbt_irec map;
xfs_fileoff_t off = 0;
int error;
ASSERT(sc->ip != NULL);
while (off < len) {
int nmaps = 1;
/*
* If we have a real extent mapping this block then we're
* in ok shape.
*/
error = xfs_bmapi_read(sc->ip, off, len - off, &map, &nmaps,
XFS_DATA_FORK);
if (error)
return error;
if (nmaps == 0) {
ASSERT(nmaps != 0);
return -EFSCORRUPTED;
}
/*
* Written extents are ok. Holes are not filled because we
* do not know the freespace information.
*/
if (xfs_bmap_is_written_extent(&map) ||
map.br_startblock == HOLESTARTBLOCK) {
off = map.br_startoff + map.br_blockcount;
continue;
}
/*
* If we find a delalloc reservation then something is very
* very wrong. Bail out.
*/
if (map.br_startblock == DELAYSTARTBLOCK)
return -EFSCORRUPTED;
/* Make sure we're really converting an unwritten extent. */
if (map.br_state != XFS_EXT_UNWRITTEN) {
ASSERT(map.br_state == XFS_EXT_UNWRITTEN);
return -EFSCORRUPTED;
}
/* Make sure this block has a real zeroed extent mapped. */
nmaps = 1;
error = xfs_bmapi_write(sc->tp, sc->ip, map.br_startoff,
map.br_blockcount,
XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO,
0, &map, &nmaps);
if (error)
return error;
if (nmaps != 1)
return -EFSCORRUPTED;
/* Commit new extent and all deferred work. */
error = xrep_defer_finish(sc);
if (error)
return error;
off = map.br_startoff + map.br_blockcount;
}
return 0;
}
/* Fix broken rt volume geometry. */
STATIC int
xrep_rtbitmap_geometry(
struct xfs_scrub *sc,
struct xchk_rtbitmap *rtb)
{
struct xfs_mount *mp = sc->mp;
struct xfs_trans *tp = sc->tp;
/* Superblock fields */
if (mp->m_sb.sb_rextents != rtb->rextents)
xfs_trans_mod_sb(sc->tp, XFS_TRANS_SB_REXTENTS,
rtb->rextents - mp->m_sb.sb_rextents);
if (mp->m_sb.sb_rbmblocks != rtb->rbmblocks)
xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS,
rtb->rbmblocks - mp->m_sb.sb_rbmblocks);
if (mp->m_sb.sb_rextslog != rtb->rextslog)
xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG,
rtb->rextslog - mp->m_sb.sb_rextslog);
/* Fix broken isize */
sc->ip->i_disk_size = roundup_64(sc->ip->i_disk_size,
mp->m_sb.sb_blocksize);
if (sc->ip->i_disk_size < XFS_FSB_TO_B(mp, rtb->rbmblocks))
sc->ip->i_disk_size = XFS_FSB_TO_B(mp, rtb->rbmblocks);
xfs_trans_log_inode(sc->tp, sc->ip, XFS_ILOG_CORE);
return xrep_roll_trans(sc);
}
/* Repair the realtime bitmap file metadata. */
int
xrep_rtbitmap(
struct xfs_scrub *sc)
{
struct xchk_rtbitmap *rtb = sc->buf;
struct xfs_mount *mp = sc->mp;
unsigned long long blocks = 0;
int error;
/* Impossibly large rtbitmap means we can't touch the filesystem. */
if (rtb->rbmblocks > U32_MAX)
return 0;
/*
* If the size of the rt bitmap file is larger than what we reserved,
* figure out if we need to adjust the block reservation in the
* transaction.
*/
blocks = xfs_bmbt_calc_size(mp, rtb->rbmblocks);
if (blocks > UINT_MAX)
return -EOPNOTSUPP;
if (blocks > rtb->resblks) {
error = xfs_trans_reserve_more(sc->tp, blocks, 0);
if (error)
return error;
rtb->resblks += blocks;
}
/* Fix inode core and forks. */
error = xrep_metadata_inode_forks(sc);
if (error)
return error;
xfs_trans_ijoin(sc->tp, sc->ip, 0);
/* Ensure no unwritten extents. */
error = xrep_rtbitmap_data_mappings(sc, rtb->rbmblocks);
if (error)
return error;
/* Fix inconsistent bitmap geometry */
return xrep_rtbitmap_geometry(sc, rtb);
}
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