--- /dev/null
+// 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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