Adding upstream version 6.8.9.upstream/6.8.9

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1525 insertions, 0 deletions

diff --git a/fs/xfs/scrub/inode_repair.c b/fs/xfs/scrub/inode_repair.c
new file mode 100644
index 0000000000..0ca62d59f8
--- /dev/null
+++ b/fs/xfs/scrub/inode_repair.c
@@ -0,0 +1,1525 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2018-2023 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_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_icache.h"
+#include "xfs_inode_buf.h"
+#include "xfs_inode_fork.h"
+#include "xfs_ialloc.h"
+#include "xfs_da_format.h"
+#include "xfs_reflink.h"
+#include "xfs_alloc.h"
+#include "xfs_rmap.h"
+#include "xfs_rmap_btree.h"
+#include "xfs_bmap.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_bmap_util.h"
+#include "xfs_dir2.h"
+#include "xfs_dir2_priv.h"
+#include "xfs_quota_defs.h"
+#include "xfs_quota.h"
+#include "xfs_ag.h"
+#include "xfs_rtbitmap.h"
+#include "xfs_attr_leaf.h"
+#include "xfs_log_priv.h"
+#include "xfs_health.h"
+#include "scrub/xfs_scrub.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+#include "scrub/btree.h"
+#include "scrub/trace.h"
+#include "scrub/repair.h"
+
+/*
+ * Inode Record Repair
+ * ===================
+ *
+ * Roughly speaking, inode problems can be classified based on whether or not
+ * they trip the dinode verifiers.  If those trip, then we won't be able to
+ * xfs_iget ourselves the inode.
+ *
+ * Therefore, the xrep_dinode_* functions fix anything that will cause the
+ * inode buffer verifier or the dinode verifier.  The xrep_inode_* functions
+ * fix things on live incore inodes.  The inode repair functions make decisions
+ * with security and usability implications when reviving a file:
+ *
+ * - Files with zero di_mode or a garbage di_mode are converted to regular file
+ *   that only root can read.  This file may not actually contain user data,
+ *   if the file was not previously a regular file.  Setuid and setgid bits
+ *   are cleared.
+ *
+ * - Zero-size directories can be truncated to look empty.  It is necessary to
+ *   run the bmapbtd and directory repair functions to fully rebuild the
+ *   directory.
+ *
+ * - Zero-size symbolic link targets can be truncated to '?'.  It is necessary
+ *   to run the bmapbtd and symlink repair functions to salvage the symlink.
+ *
+ * - Invalid extent size hints will be removed.
+ *
+ * - Quotacheck will be scheduled if we repaired an inode that was so badly
+ *   damaged that the ondisk inode had to be rebuilt.
+ *
+ * - Invalid user, group, or project IDs (aka -1U) will be reset to zero.
+ *   Setuid and setgid bits are cleared.
+ *
+ * - Data and attr forks are reset to extents format with zero extents if the
+ *   fork data is inconsistent.  It is necessary to run the bmapbtd or bmapbta
+ *   repair functions to recover the space mapping.
+ *
+ * - ACLs will not be recovered if the attr fork is zapped or the extended
+ *   attribute structure itself requires salvaging.
+ *
+ * - If the attr fork is zapped, the user and group ids are reset to root and
+ *   the setuid and setgid bits are removed.
+ */
+
+/*
+ * All the information we need to repair the ondisk inode if we can't iget the
+ * incore inode.  We don't allocate this buffer unless we're going to perform
+ * a repair to the ondisk inode cluster buffer.
+ */
+struct xrep_inode {
+	/* Inode mapping that we saved from the initial lookup attempt. */
+	struct xfs_imap		imap;
+
+	struct xfs_scrub	*sc;
+
+	/* Blocks in use on the data device by data extents or bmbt blocks. */
+	xfs_rfsblock_t		data_blocks;
+
+	/* Blocks in use on the rt device. */
+	xfs_rfsblock_t		rt_blocks;
+
+	/* Blocks in use by the attr fork. */
+	xfs_rfsblock_t		attr_blocks;
+
+	/* Number of data device extents for the data fork. */
+	xfs_extnum_t		data_extents;
+
+	/*
+	 * Number of realtime device extents for the data fork.  If
+	 * data_extents and rt_extents indicate that the data fork has extents
+	 * on both devices, we'll just back away slowly.
+	 */
+	xfs_extnum_t		rt_extents;
+
+	/* Number of (data device) extents for the attr fork. */
+	xfs_aextnum_t		attr_extents;
+
+	/* Sick state to set after zapping parts of the inode. */
+	unsigned int		ino_sick_mask;
+
+	/* Must we remove all access from this file? */
+	bool			zap_acls;
+};
+
+/*
+ * Setup function for inode repair.  @imap contains the ondisk inode mapping
+ * information so that we can correct the ondisk inode cluster buffer if
+ * necessary to make iget work.
+ */
+int
+xrep_setup_inode(
+	struct xfs_scrub	*sc,
+	const struct xfs_imap	*imap)
+{
+	struct xrep_inode	*ri;
+
+	sc->buf = kzalloc(sizeof(struct xrep_inode), XCHK_GFP_FLAGS);
+	if (!sc->buf)
+		return -ENOMEM;
+
+	ri = sc->buf;
+	memcpy(&ri->imap, imap, sizeof(struct xfs_imap));
+	ri->sc = sc;
+	return 0;
+}
+
+/*
+ * Make sure this ondisk inode can pass the inode buffer verifier.  This is
+ * not the same as the dinode verifier.
+ */
+STATIC void
+xrep_dinode_buf_core(
+	struct xfs_scrub	*sc,
+	struct xfs_buf		*bp,
+	unsigned int		ioffset)
+{
+	struct xfs_dinode	*dip = xfs_buf_offset(bp, ioffset);
+	struct xfs_trans	*tp = sc->tp;
+	struct xfs_mount	*mp = sc->mp;
+	xfs_agino_t		agino;
+	bool			crc_ok = false;
+	bool			magic_ok = false;
+	bool			unlinked_ok = false;
+
+	agino = be32_to_cpu(dip->di_next_unlinked);
+
+	if (xfs_verify_agino_or_null(bp->b_pag, agino))
+		unlinked_ok = true;
+
+	if (dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
+	    xfs_dinode_good_version(mp, dip->di_version))
+		magic_ok = true;
+
+	if (xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
+			XFS_DINODE_CRC_OFF))
+		crc_ok = true;
+
+	if (magic_ok && unlinked_ok && crc_ok)
+		return;
+
+	if (!magic_ok) {
+		dip->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
+		dip->di_version = 3;
+	}
+	if (!unlinked_ok)
+		dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
+	xfs_dinode_calc_crc(mp, dip);
+	xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
+	xfs_trans_log_buf(tp, bp, ioffset,
+				  ioffset + sizeof(struct xfs_dinode) - 1);
+}
+
+/* Make sure this inode cluster buffer can pass the inode buffer verifier. */
+STATIC void
+xrep_dinode_buf(
+	struct xfs_scrub	*sc,
+	struct xfs_buf		*bp)
+{
+	struct xfs_mount	*mp = sc->mp;
+	int			i;
+	int			ni;
+
+	ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
+	for (i = 0; i < ni; i++)
+		xrep_dinode_buf_core(sc, bp, i << mp->m_sb.sb_inodelog);
+}
+
+/* Reinitialize things that never change in an inode. */
+STATIC void
+xrep_dinode_header(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip)
+{
+	trace_xrep_dinode_header(sc, dip);
+
+	dip->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
+	if (!xfs_dinode_good_version(sc->mp, dip->di_version))
+		dip->di_version = 3;
+	dip->di_ino = cpu_to_be64(sc->sm->sm_ino);
+	uuid_copy(&dip->di_uuid, &sc->mp->m_sb.sb_meta_uuid);
+	dip->di_gen = cpu_to_be32(sc->sm->sm_gen);
+}
+
+/* Turn di_mode into /something/ recognizable. */
+STATIC void
+xrep_dinode_mode(
+	struct xrep_inode	*ri,
+	struct xfs_dinode	*dip)
+{
+	struct xfs_scrub	*sc = ri->sc;
+	uint16_t		mode = be16_to_cpu(dip->di_mode);
+
+	trace_xrep_dinode_mode(sc, dip);
+
+	if (mode == 0 || xfs_mode_to_ftype(mode) != XFS_DIR3_FT_UNKNOWN)
+		return;
+
+	/* bad mode, so we set it to a file that only root can read */
+	mode = S_IFREG;
+	dip->di_mode = cpu_to_be16(mode);
+	dip->di_uid = 0;
+	dip->di_gid = 0;
+	ri->zap_acls = true;
+}
+
+/* Fix any conflicting flags that the verifiers complain about. */
+STATIC void
+xrep_dinode_flags(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip,
+	bool			isrt)
+{
+	struct xfs_mount	*mp = sc->mp;
+	uint64_t		flags2 = be64_to_cpu(dip->di_flags2);
+	uint16_t		flags = be16_to_cpu(dip->di_flags);
+	uint16_t		mode = be16_to_cpu(dip->di_mode);
+
+	trace_xrep_dinode_flags(sc, dip);
+
+	if (isrt)
+		flags |= XFS_DIFLAG_REALTIME;
+	else
+		flags &= ~XFS_DIFLAG_REALTIME;
+
+	/*
+	 * For regular files on a reflink filesystem, set the REFLINK flag to
+	 * protect shared extents.  A later stage will actually check those
+	 * extents and clear the flag if possible.
+	 */
+	if (xfs_has_reflink(mp) && S_ISREG(mode))
+		flags2 |= XFS_DIFLAG2_REFLINK;
+	else
+		flags2 &= ~(XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE);
+	if (flags & XFS_DIFLAG_REALTIME)
+		flags2 &= ~XFS_DIFLAG2_REFLINK;
+	if (!xfs_has_bigtime(mp))
+		flags2 &= ~XFS_DIFLAG2_BIGTIME;
+	if (!xfs_has_large_extent_counts(mp))
+		flags2 &= ~XFS_DIFLAG2_NREXT64;
+	if (flags2 & XFS_DIFLAG2_NREXT64)
+		dip->di_nrext64_pad = 0;
+	else if (dip->di_version >= 3)
+		dip->di_v3_pad = 0;
+	dip->di_flags = cpu_to_be16(flags);
+	dip->di_flags2 = cpu_to_be64(flags2);
+}
+
+/*
+ * Blow out symlink; now it points nowhere.  We don't have to worry about
+ * incore state because this inode is failing the verifiers.
+ */
+STATIC void
+xrep_dinode_zap_symlink(
+	struct xrep_inode	*ri,
+	struct xfs_dinode	*dip)
+{
+	struct xfs_scrub	*sc = ri->sc;
+	char			*p;
+
+	trace_xrep_dinode_zap_symlink(sc, dip);
+
+	dip->di_format = XFS_DINODE_FMT_LOCAL;
+	dip->di_size = cpu_to_be64(1);
+	p = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
+	*p = '?';
+	ri->ino_sick_mask |= XFS_SICK_INO_SYMLINK_ZAPPED;
+}
+
+/*
+ * Blow out dir, make the parent point to the root.  In the future repair will
+ * reconstruct this directory for us.  Note that there's no in-core directory
+ * inode because the sf verifier tripped, so we don't have to worry about the
+ * dentry cache.
+ */
+STATIC void
+xrep_dinode_zap_dir(
+	struct xrep_inode	*ri,
+	struct xfs_dinode	*dip)
+{
+	struct xfs_scrub	*sc = ri->sc;
+	struct xfs_mount	*mp = sc->mp;
+	struct xfs_dir2_sf_hdr	*sfp;
+	int			i8count;
+
+	trace_xrep_dinode_zap_dir(sc, dip);
+
+	dip->di_format = XFS_DINODE_FMT_LOCAL;
+	i8count = mp->m_sb.sb_rootino > XFS_DIR2_MAX_SHORT_INUM;
+	sfp = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
+	sfp->count = 0;
+	sfp->i8count = i8count;
+	xfs_dir2_sf_put_parent_ino(sfp, mp->m_sb.sb_rootino);
+	dip->di_size = cpu_to_be64(xfs_dir2_sf_hdr_size(i8count));
+	ri->ino_sick_mask |= XFS_SICK_INO_DIR_ZAPPED;
+}
+
+/* Make sure we don't have a garbage file size. */
+STATIC void
+xrep_dinode_size(
+	struct xrep_inode	*ri,
+	struct xfs_dinode	*dip)
+{
+	struct xfs_scrub	*sc = ri->sc;
+	uint64_t		size = be64_to_cpu(dip->di_size);
+	uint16_t		mode = be16_to_cpu(dip->di_mode);
+
+	trace_xrep_dinode_size(sc, dip);
+
+	switch (mode & S_IFMT) {
+	case S_IFIFO:
+	case S_IFCHR:
+	case S_IFBLK:
+	case S_IFSOCK:
+		/* di_size can't be nonzero for special files */
+		dip->di_size = 0;
+		break;
+	case S_IFREG:
+		/* Regular files can't be larger than 2^63-1 bytes. */
+		dip->di_size = cpu_to_be64(size & ~(1ULL << 63));
+		break;
+	case S_IFLNK:
+		/*
+		 * Truncate ridiculously oversized symlinks.  If the size is
+		 * zero, reset it to point to the current directory.  Both of
+		 * these conditions trigger dinode verifier errors, so there
+		 * is no in-core state to reset.
+		 */
+		if (size > XFS_SYMLINK_MAXLEN)
+			dip->di_size = cpu_to_be64(XFS_SYMLINK_MAXLEN);
+		else if (size == 0)
+			xrep_dinode_zap_symlink(ri, dip);
+		break;
+	case S_IFDIR:
+		/*
+		 * Directories can't have a size larger than 32G.  If the size
+		 * is zero, reset it to an empty directory.  Both of these
+		 * conditions trigger dinode verifier errors, so there is no
+		 * in-core state to reset.
+		 */
+		if (size > XFS_DIR2_SPACE_SIZE)
+			dip->di_size = cpu_to_be64(XFS_DIR2_SPACE_SIZE);
+		else if (size == 0)
+			xrep_dinode_zap_dir(ri, dip);
+		break;
+	}
+}
+
+/* Fix extent size hints. */
+STATIC void
+xrep_dinode_extsize_hints(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip)
+{
+	struct xfs_mount	*mp = sc->mp;
+	uint64_t		flags2 = be64_to_cpu(dip->di_flags2);
+	uint16_t		flags = be16_to_cpu(dip->di_flags);
+	uint16_t		mode = be16_to_cpu(dip->di_mode);
+
+	xfs_failaddr_t		fa;
+
+	trace_xrep_dinode_extsize_hints(sc, dip);
+
+	fa = xfs_inode_validate_extsize(mp, be32_to_cpu(dip->di_extsize),
+			mode, flags);
+	if (fa) {
+		dip->di_extsize = 0;
+		dip->di_flags &= ~cpu_to_be16(XFS_DIFLAG_EXTSIZE |
+					      XFS_DIFLAG_EXTSZINHERIT);
+	}
+
+	if (dip->di_version < 3)
+		return;
+
+	fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize),
+			mode, flags, flags2);
+	if (fa) {
+		dip->di_cowextsize = 0;
+		dip->di_flags2 &= ~cpu_to_be64(XFS_DIFLAG2_COWEXTSIZE);
+	}
+}
+
+/* Count extents and blocks for an inode given an rmap. */
+STATIC int
+xrep_dinode_walk_rmap(
+	struct xfs_btree_cur		*cur,
+	const struct xfs_rmap_irec	*rec,
+	void				*priv)
+{
+	struct xrep_inode		*ri = priv;
+	int				error = 0;
+
+	if (xchk_should_terminate(ri->sc, &error))
+		return error;
+
+	/* We only care about this inode. */
+	if (rec->rm_owner != ri->sc->sm->sm_ino)
+		return 0;
+
+	if (rec->rm_flags & XFS_RMAP_ATTR_FORK) {
+		ri->attr_blocks += rec->rm_blockcount;
+		if (!(rec->rm_flags & XFS_RMAP_BMBT_BLOCK))
+			ri->attr_extents++;
+
+		return 0;
+	}
+
+	ri->data_blocks += rec->rm_blockcount;
+	if (!(rec->rm_flags & XFS_RMAP_BMBT_BLOCK))
+		ri->data_extents++;
+
+	return 0;
+}
+
+/* Count extents and blocks for an inode from all AG rmap data. */
+STATIC int
+xrep_dinode_count_ag_rmaps(
+	struct xrep_inode	*ri,
+	struct xfs_perag	*pag)
+{
+	struct xfs_btree_cur	*cur;
+	struct xfs_buf		*agf;
+	int			error;
+
+	error = xfs_alloc_read_agf(pag, ri->sc->tp, 0, &agf);
+	if (error)
+		return error;
+
+	cur = xfs_rmapbt_init_cursor(ri->sc->mp, ri->sc->tp, agf, pag);
+	error = xfs_rmap_query_all(cur, xrep_dinode_walk_rmap, ri);
+	xfs_btree_del_cursor(cur, error);
+	xfs_trans_brelse(ri->sc->tp, agf);
+	return error;
+}
+
+/* Count extents and blocks for a given inode from all rmap data. */
+STATIC int
+xrep_dinode_count_rmaps(
+	struct xrep_inode	*ri)
+{
+	struct xfs_perag	*pag;
+	xfs_agnumber_t		agno;
+	int			error;
+
+	if (!xfs_has_rmapbt(ri->sc->mp) || xfs_has_realtime(ri->sc->mp))
+		return -EOPNOTSUPP;
+
+	for_each_perag(ri->sc->mp, agno, pag) {
+		error = xrep_dinode_count_ag_rmaps(ri, pag);
+		if (error) {
+			xfs_perag_rele(pag);
+			return error;
+		}
+	}
+
+	/* Can't have extents on both the rt and the data device. */
+	if (ri->data_extents && ri->rt_extents)
+		return -EFSCORRUPTED;
+
+	trace_xrep_dinode_count_rmaps(ri->sc,
+			ri->data_blocks, ri->rt_blocks, ri->attr_blocks,
+			ri->data_extents, ri->rt_extents, ri->attr_extents);
+	return 0;
+}
+
+/* Return true if this extents-format ifork looks like garbage. */
+STATIC bool
+xrep_dinode_bad_extents_fork(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip,
+	unsigned int		dfork_size,
+	int			whichfork)
+{
+	struct xfs_bmbt_irec	new;
+	struct xfs_bmbt_rec	*dp;
+	xfs_extnum_t		nex;
+	bool			isrt;
+	unsigned int		i;
+
+	nex = xfs_dfork_nextents(dip, whichfork);
+	if (nex > dfork_size / sizeof(struct xfs_bmbt_rec))
+		return true;
+
+	dp = XFS_DFORK_PTR(dip, whichfork);
+
+	isrt = dip->di_flags & cpu_to_be16(XFS_DIFLAG_REALTIME);
+	for (i = 0; i < nex; i++, dp++) {
+		xfs_failaddr_t	fa;
+
+		xfs_bmbt_disk_get_all(dp, &new);
+		fa = xfs_bmap_validate_extent_raw(sc->mp, isrt, whichfork,
+				&new);
+		if (fa)
+			return true;
+	}
+
+	return false;
+}
+
+/* Return true if this btree-format ifork looks like garbage. */
+STATIC bool
+xrep_dinode_bad_bmbt_fork(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip,
+	unsigned int		dfork_size,
+	int			whichfork)
+{
+	struct xfs_bmdr_block	*dfp;
+	xfs_extnum_t		nex;
+	unsigned int		i;
+	unsigned int		dmxr;
+	unsigned int		nrecs;
+	unsigned int		level;
+
+	nex = xfs_dfork_nextents(dip, whichfork);
+	if (nex <= dfork_size / sizeof(struct xfs_bmbt_rec))
+		return true;
+
+	if (dfork_size < sizeof(struct xfs_bmdr_block))
+		return true;
+
+	dfp = XFS_DFORK_PTR(dip, whichfork);
+	nrecs = be16_to_cpu(dfp->bb_numrecs);
+	level = be16_to_cpu(dfp->bb_level);
+
+	if (nrecs == 0 || XFS_BMDR_SPACE_CALC(nrecs) > dfork_size)
+		return true;
+	if (level == 0 || level >= XFS_BM_MAXLEVELS(sc->mp, whichfork))
+		return true;
+
+	dmxr = xfs_bmdr_maxrecs(dfork_size, 0);
+	for (i = 1; i <= nrecs; i++) {
+		struct xfs_bmbt_key	*fkp;
+		xfs_bmbt_ptr_t		*fpp;
+		xfs_fileoff_t		fileoff;
+		xfs_fsblock_t		fsbno;
+
+		fkp = XFS_BMDR_KEY_ADDR(dfp, i);
+		fileoff = be64_to_cpu(fkp->br_startoff);
+		if (!xfs_verify_fileoff(sc->mp, fileoff))
+			return true;
+
+		fpp = XFS_BMDR_PTR_ADDR(dfp, i, dmxr);
+		fsbno = be64_to_cpu(*fpp);
+		if (!xfs_verify_fsbno(sc->mp, fsbno))
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * Check the data fork for things that will fail the ifork verifiers or the
+ * ifork formatters.
+ */
+STATIC bool
+xrep_dinode_check_dfork(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip,
+	uint16_t		mode)
+{
+	void			*dfork_ptr;
+	int64_t			data_size;
+	unsigned int		fmt;
+	unsigned int		dfork_size;
+
+	/*
+	 * Verifier functions take signed int64_t, so check for bogus negative
+	 * values first.
+	 */
+	data_size = be64_to_cpu(dip->di_size);
+	if (data_size < 0)
+		return true;
+
+	fmt = XFS_DFORK_FORMAT(dip, XFS_DATA_FORK);
+	switch (mode & S_IFMT) {
+	case S_IFIFO:
+	case S_IFCHR:
+	case S_IFBLK:
+	case S_IFSOCK:
+		if (fmt != XFS_DINODE_FMT_DEV)
+			return true;
+		break;
+	case S_IFREG:
+		if (fmt == XFS_DINODE_FMT_LOCAL)
+			return true;
+		fallthrough;
+	case S_IFLNK:
+	case S_IFDIR:
+		switch (fmt) {
+		case XFS_DINODE_FMT_LOCAL:
+		case XFS_DINODE_FMT_EXTENTS:
+		case XFS_DINODE_FMT_BTREE:
+			break;
+		default:
+			return true;
+		}
+		break;
+	default:
+		return true;
+	}
+
+	dfork_size = XFS_DFORK_SIZE(dip, sc->mp, XFS_DATA_FORK);
+	dfork_ptr = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
+
+	switch (fmt) {
+	case XFS_DINODE_FMT_DEV:
+		break;
+	case XFS_DINODE_FMT_LOCAL:
+		/* dir/symlink structure cannot be larger than the fork */
+		if (data_size > dfork_size)
+			return true;
+		/* directory structure must pass verification. */
+		if (S_ISDIR(mode) &&
+		    xfs_dir2_sf_verify(sc->mp, dfork_ptr, data_size) != NULL)
+			return true;
+		/* symlink structure must pass verification. */
+		if (S_ISLNK(mode) &&
+		    xfs_symlink_shortform_verify(dfork_ptr, data_size) != NULL)
+			return true;
+		break;
+	case XFS_DINODE_FMT_EXTENTS:
+		if (xrep_dinode_bad_extents_fork(sc, dip, dfork_size,
+				XFS_DATA_FORK))
+			return true;
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		if (xrep_dinode_bad_bmbt_fork(sc, dip, dfork_size,
+				XFS_DATA_FORK))
+			return true;
+		break;
+	default:
+		return true;
+	}
+
+	return false;
+}
+
+static void
+xrep_dinode_set_data_nextents(
+	struct xfs_dinode	*dip,
+	xfs_extnum_t		nextents)
+{
+	if (xfs_dinode_has_large_extent_counts(dip))
+		dip->di_big_nextents = cpu_to_be64(nextents);
+	else
+		dip->di_nextents = cpu_to_be32(nextents);
+}
+
+static void
+xrep_dinode_set_attr_nextents(
+	struct xfs_dinode	*dip,
+	xfs_extnum_t		nextents)
+{
+	if (xfs_dinode_has_large_extent_counts(dip))
+		dip->di_big_anextents = cpu_to_be32(nextents);
+	else
+		dip->di_anextents = cpu_to_be16(nextents);
+}
+
+/* Reset the data fork to something sane. */
+STATIC void
+xrep_dinode_zap_dfork(
+	struct xrep_inode	*ri,
+	struct xfs_dinode	*dip,
+	uint16_t		mode)
+{
+	struct xfs_scrub	*sc = ri->sc;
+
+	trace_xrep_dinode_zap_dfork(sc, dip);
+
+	ri->ino_sick_mask |= XFS_SICK_INO_BMBTD_ZAPPED;
+
+	xrep_dinode_set_data_nextents(dip, 0);
+	ri->data_blocks = 0;
+	ri->rt_blocks = 0;
+
+	/* Special files always get reset to DEV */
+	switch (mode & S_IFMT) {
+	case S_IFIFO:
+	case S_IFCHR:
+	case S_IFBLK:
+	case S_IFSOCK:
+		dip->di_format = XFS_DINODE_FMT_DEV;
+		dip->di_size = 0;
+		return;
+	}
+
+	/*
+	 * If we have data extents, reset to an empty map and hope the user
+	 * will run the bmapbtd checker next.
+	 */
+	if (ri->data_extents || ri->rt_extents || S_ISREG(mode)) {
+		dip->di_format = XFS_DINODE_FMT_EXTENTS;
+		return;
+	}
+
+	/* Otherwise, reset the local format to the minimum. */
+	switch (mode & S_IFMT) {
+	case S_IFLNK:
+		xrep_dinode_zap_symlink(ri, dip);
+		break;
+	case S_IFDIR:
+		xrep_dinode_zap_dir(ri, dip);
+		break;
+	}
+}
+
+/*
+ * Check the attr fork for things that will fail the ifork verifiers or the
+ * ifork formatters.
+ */
+STATIC bool
+xrep_dinode_check_afork(
+	struct xfs_scrub		*sc,
+	struct xfs_dinode		*dip)
+{
+	struct xfs_attr_sf_hdr		*afork_ptr;
+	size_t				attr_size;
+	unsigned int			afork_size;
+
+	if (XFS_DFORK_BOFF(dip) == 0)
+		return dip->di_aformat != XFS_DINODE_FMT_EXTENTS ||
+		       xfs_dfork_attr_extents(dip) != 0;
+
+	afork_size = XFS_DFORK_SIZE(dip, sc->mp, XFS_ATTR_FORK);
+	afork_ptr = XFS_DFORK_PTR(dip, XFS_ATTR_FORK);
+
+	switch (XFS_DFORK_FORMAT(dip, XFS_ATTR_FORK)) {
+	case XFS_DINODE_FMT_LOCAL:
+		/* Fork has to be large enough to extract the xattr size. */
+		if (afork_size < sizeof(struct xfs_attr_sf_hdr))
+			return true;
+
+		/* xattr structure cannot be larger than the fork */
+		attr_size = be16_to_cpu(afork_ptr->totsize);
+		if (attr_size > afork_size)
+			return true;
+
+		/* xattr structure must pass verification. */
+		return xfs_attr_shortform_verify(afork_ptr, attr_size) != NULL;
+	case XFS_DINODE_FMT_EXTENTS:
+		if (xrep_dinode_bad_extents_fork(sc, dip, afork_size,
+					XFS_ATTR_FORK))
+			return true;
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		if (xrep_dinode_bad_bmbt_fork(sc, dip, afork_size,
+					XFS_ATTR_FORK))
+			return true;
+		break;
+	default:
+		return true;
+	}
+
+	return false;
+}
+
+/*
+ * Reset the attr fork to empty.  Since the attr fork could have contained
+ * ACLs, make the file readable only by root.
+ */
+STATIC void
+xrep_dinode_zap_afork(
+	struct xrep_inode	*ri,
+	struct xfs_dinode	*dip,
+	uint16_t		mode)
+{
+	struct xfs_scrub	*sc = ri->sc;
+
+	trace_xrep_dinode_zap_afork(sc, dip);
+
+	ri->ino_sick_mask |= XFS_SICK_INO_BMBTA_ZAPPED;
+
+	dip->di_aformat = XFS_DINODE_FMT_EXTENTS;
+	xrep_dinode_set_attr_nextents(dip, 0);
+	ri->attr_blocks = 0;
+
+	/*
+	 * If the data fork is in btree format, removing the attr fork entirely
+	 * might cause verifier failures if the next level down in the bmbt
+	 * could now fit in the data fork area.
+	 */
+	if (dip->di_format != XFS_DINODE_FMT_BTREE)
+		dip->di_forkoff = 0;
+	dip->di_mode = cpu_to_be16(mode & ~0777);
+	dip->di_uid = 0;
+	dip->di_gid = 0;
+}
+
+/* Make sure the fork offset is a sensible value. */
+STATIC void
+xrep_dinode_ensure_forkoff(
+	struct xrep_inode	*ri,
+	struct xfs_dinode	*dip,
+	uint16_t		mode)
+{
+	struct xfs_bmdr_block	*bmdr;
+	struct xfs_scrub	*sc = ri->sc;
+	xfs_extnum_t		attr_extents, data_extents;
+	size_t			bmdr_minsz = XFS_BMDR_SPACE_CALC(1);
+	unsigned int		lit_sz = XFS_LITINO(sc->mp);
+	unsigned int		afork_min, dfork_min;
+
+	trace_xrep_dinode_ensure_forkoff(sc, dip);
+
+	/*
+	 * Before calling this function, xrep_dinode_core ensured that both
+	 * forks actually fit inside their respective literal areas.  If this
+	 * was not the case, the fork was reset to FMT_EXTENTS with zero
+	 * records.  If the rmapbt scan found attr or data fork blocks, this
+	 * will be noted in the dinode_stats, and we must leave enough room
+	 * for the bmap repair code to reconstruct the mapping structure.
+	 *
+	 * First, compute the minimum space required for the attr fork.
+	 */
+	switch (dip->di_aformat) {
+	case XFS_DINODE_FMT_LOCAL:
+		/*
+		 * If we still have a shortform xattr structure at all, that
+		 * means the attr fork area was exactly large enough to fit
+		 * the sf structure.
+		 */
+		afork_min = XFS_DFORK_SIZE(dip, sc->mp, XFS_ATTR_FORK);
+		break;
+	case XFS_DINODE_FMT_EXTENTS:
+		attr_extents = xfs_dfork_attr_extents(dip);
+		if (attr_extents) {
+			/*
+			 * We must maintain sufficient space to hold the entire
+			 * extent map array in the data fork.  Note that we
+			 * previously zapped the fork if it had no chance of
+			 * fitting in the inode.
+			 */
+			afork_min = sizeof(struct xfs_bmbt_rec) * attr_extents;
+		} else if (ri->attr_extents > 0) {
+			/*
+			 * The attr fork thinks it has zero extents, but we
+			 * found some xattr extents.  We need to leave enough
+			 * empty space here so that the incore attr fork will
+			 * get created (and hence trigger the attr fork bmap
+			 * repairer).
+			 */
+			afork_min = bmdr_minsz;
+		} else {
+			/* No extents on disk or found in rmapbt. */
+			afork_min = 0;
+		}
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		/* Must have space for btree header and key/pointers. */
+		bmdr = XFS_DFORK_PTR(dip, XFS_ATTR_FORK);
+		afork_min = XFS_BMAP_BROOT_SPACE(sc->mp, bmdr);
+		break;
+	default:
+		/* We should never see any other formats. */
+		afork_min = 0;
+		break;
+	}
+
+	/* Compute the minimum space required for the data fork. */
+	switch (dip->di_format) {
+	case XFS_DINODE_FMT_DEV:
+		dfork_min = sizeof(__be32);
+		break;
+	case XFS_DINODE_FMT_UUID:
+		dfork_min = sizeof(uuid_t);
+		break;
+	case XFS_DINODE_FMT_LOCAL:
+		/*
+		 * If we still have a shortform data fork at all, that means
+		 * the data fork area was large enough to fit whatever was in
+		 * there.
+		 */
+		dfork_min = be64_to_cpu(dip->di_size);
+		break;
+	case XFS_DINODE_FMT_EXTENTS:
+		data_extents = xfs_dfork_data_extents(dip);
+		if (data_extents) {
+			/*
+			 * We must maintain sufficient space to hold the entire
+			 * extent map array in the data fork.  Note that we
+			 * previously zapped the fork if it had no chance of
+			 * fitting in the inode.
+			 */
+			dfork_min = sizeof(struct xfs_bmbt_rec) * data_extents;
+		} else if (ri->data_extents > 0 || ri->rt_extents > 0) {
+			/*
+			 * The data fork thinks it has zero extents, but we
+			 * found some data extents.  We need to leave enough
+			 * empty space here so that the data fork bmap repair
+			 * will recover the mappings.
+			 */
+			dfork_min = bmdr_minsz;
+		} else {
+			/* No extents on disk or found in rmapbt. */
+			dfork_min = 0;
+		}
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		/* Must have space for btree header and key/pointers. */
+		bmdr = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
+		dfork_min = XFS_BMAP_BROOT_SPACE(sc->mp, bmdr);
+		break;
+	default:
+		dfork_min = 0;
+		break;
+	}
+
+	/*
+	 * Round all values up to the nearest 8 bytes, because that is the
+	 * precision of di_forkoff.
+	 */
+	afork_min = roundup(afork_min, 8);
+	dfork_min = roundup(dfork_min, 8);
+	bmdr_minsz = roundup(bmdr_minsz, 8);
+
+	ASSERT(dfork_min <= lit_sz);
+	ASSERT(afork_min <= lit_sz);
+
+	/*
+	 * If the data fork was zapped and we don't have enough space for the
+	 * recovery fork, move the attr fork up.
+	 */
+	if (dip->di_format == XFS_DINODE_FMT_EXTENTS &&
+	    xfs_dfork_data_extents(dip) == 0 &&
+	    (ri->data_extents > 0 || ri->rt_extents > 0) &&
+	    bmdr_minsz > XFS_DFORK_DSIZE(dip, sc->mp)) {
+		if (bmdr_minsz + afork_min > lit_sz) {
+			/*
+			 * The attr for and the stub fork we need to recover
+			 * the data fork won't both fit.  Zap the attr fork.
+			 */
+			xrep_dinode_zap_afork(ri, dip, mode);
+			afork_min = bmdr_minsz;
+		} else {
+			void	*before, *after;
+
+			/* Otherwise, just slide the attr fork up. */
+			before = XFS_DFORK_APTR(dip);
+			dip->di_forkoff = bmdr_minsz >> 3;
+			after = XFS_DFORK_APTR(dip);
+			memmove(after, before, XFS_DFORK_ASIZE(dip, sc->mp));
+		}
+	}
+
+	/*
+	 * If the attr fork was zapped and we don't have enough space for the
+	 * recovery fork, move the attr fork down.
+	 */
+	if (dip->di_aformat == XFS_DINODE_FMT_EXTENTS &&
+	    xfs_dfork_attr_extents(dip) == 0 &&
+	    ri->attr_extents > 0 &&
+	    bmdr_minsz > XFS_DFORK_ASIZE(dip, sc->mp)) {
+		if (dip->di_format == XFS_DINODE_FMT_BTREE) {
+			/*
+			 * If the data fork is in btree format then we can't
+			 * adjust forkoff because that runs the risk of
+			 * violating the extents/btree format transition rules.
+			 */
+		} else if (bmdr_minsz + dfork_min > lit_sz) {
+			/*
+			 * If we can't move the attr fork, too bad, we lose the
+			 * attr fork and leak its blocks.
+			 */
+			xrep_dinode_zap_afork(ri, dip, mode);
+		} else {
+			/*
+			 * Otherwise, just slide the attr fork down.  The attr
+			 * fork is empty, so we don't have any old contents to
+			 * move here.
+			 */
+			dip->di_forkoff = (lit_sz - bmdr_minsz) >> 3;
+		}
+	}
+}
+
+/*
+ * Zap the data/attr forks if we spot anything that isn't going to pass the
+ * ifork verifiers or the ifork formatters, because we need to get the inode
+ * into good enough shape that the higher level repair functions can run.
+ */
+STATIC void
+xrep_dinode_zap_forks(
+	struct xrep_inode	*ri,
+	struct xfs_dinode	*dip)
+{
+	struct xfs_scrub	*sc = ri->sc;
+	xfs_extnum_t		data_extents;
+	xfs_extnum_t		attr_extents;
+	xfs_filblks_t		nblocks;
+	uint16_t		mode;
+	bool			zap_datafork = false;
+	bool			zap_attrfork = ri->zap_acls;
+
+	trace_xrep_dinode_zap_forks(sc, dip);
+
+	mode = be16_to_cpu(dip->di_mode);
+
+	data_extents = xfs_dfork_data_extents(dip);
+	attr_extents = xfs_dfork_attr_extents(dip);
+	nblocks = be64_to_cpu(dip->di_nblocks);
+
+	/* Inode counters don't make sense? */
+	if (data_extents > nblocks)
+		zap_datafork = true;
+	if (attr_extents > nblocks)
+		zap_attrfork = true;
+	if (data_extents + attr_extents > nblocks)
+		zap_datafork = zap_attrfork = true;
+
+	if (!zap_datafork)
+		zap_datafork = xrep_dinode_check_dfork(sc, dip, mode);
+	if (!zap_attrfork)
+		zap_attrfork = xrep_dinode_check_afork(sc, dip);
+
+	/* Zap whatever's bad. */
+	if (zap_attrfork)
+		xrep_dinode_zap_afork(ri, dip, mode);
+	if (zap_datafork)
+		xrep_dinode_zap_dfork(ri, dip, mode);
+	xrep_dinode_ensure_forkoff(ri, dip, mode);
+
+	/*
+	 * Zero di_nblocks if we don't have any extents at all to satisfy the
+	 * buffer verifier.
+	 */
+	data_extents = xfs_dfork_data_extents(dip);
+	attr_extents = xfs_dfork_attr_extents(dip);
+	if (data_extents + attr_extents == 0)
+		dip->di_nblocks = 0;
+}
+
+/* Inode didn't pass dinode verifiers, so fix the raw buffer and retry iget. */
+STATIC int
+xrep_dinode_core(
+	struct xrep_inode	*ri)
+{
+	struct xfs_scrub	*sc = ri->sc;
+	struct xfs_buf		*bp;
+	struct xfs_dinode	*dip;
+	xfs_ino_t		ino = sc->sm->sm_ino;
+	int			error;
+	int			iget_error;
+
+	/* Figure out what this inode had mapped in both forks. */
+	error = xrep_dinode_count_rmaps(ri);
+	if (error)
+		return error;
+
+	/* Read the inode cluster buffer. */
+	error = xfs_trans_read_buf(sc->mp, sc->tp, sc->mp->m_ddev_targp,
+			ri->imap.im_blkno, ri->imap.im_len, XBF_UNMAPPED, &bp,
+			NULL);
+	if (error)
+		return error;
+
+	/* Make sure we can pass the inode buffer verifier. */
+	xrep_dinode_buf(sc, bp);
+	bp->b_ops = &xfs_inode_buf_ops;
+
+	/* Fix everything the verifier will complain about. */
+	dip = xfs_buf_offset(bp, ri->imap.im_boffset);
+	xrep_dinode_header(sc, dip);
+	xrep_dinode_mode(ri, dip);
+	xrep_dinode_flags(sc, dip, ri->rt_extents > 0);
+	xrep_dinode_size(ri, dip);
+	xrep_dinode_extsize_hints(sc, dip);
+	xrep_dinode_zap_forks(ri, dip);
+
+	/* Write out the inode. */
+	trace_xrep_dinode_fixed(sc, dip);
+	xfs_dinode_calc_crc(sc->mp, dip);
+	xfs_trans_buf_set_type(sc->tp, bp, XFS_BLFT_DINO_BUF);
+	xfs_trans_log_buf(sc->tp, bp, ri->imap.im_boffset,
+			ri->imap.im_boffset + sc->mp->m_sb.sb_inodesize - 1);
+
+	/*
+	 * In theory, we've fixed the ondisk inode record enough that we should
+	 * be able to load the inode into the cache.  Try to iget that inode
+	 * now while we hold the AGI and the inode cluster buffer and take the
+	 * IOLOCK so that we can continue with repairs without anyone else
+	 * accessing the inode.  If iget fails, we still need to commit the
+	 * changes.
+	 */
+	iget_error = xchk_iget(sc, ino, &sc->ip);
+	if (!iget_error)
+		xchk_ilock(sc, XFS_IOLOCK_EXCL);
+
+	/*
+	 * Commit the inode cluster buffer updates and drop the AGI buffer that
+	 * we've been holding since scrub setup.  From here on out, repairs
+	 * deal only with the cached inode.
+	 */
+	error = xrep_trans_commit(sc);
+	if (error)
+		return error;
+
+	if (iget_error)
+		return iget_error;
+
+	error = xchk_trans_alloc(sc, 0);
+	if (error)
+		return error;
+
+	error = xrep_ino_dqattach(sc);
+	if (error)
+		return error;
+
+	xchk_ilock(sc, XFS_ILOCK_EXCL);
+	if (ri->ino_sick_mask)
+		xfs_inode_mark_sick(sc->ip, ri->ino_sick_mask);
+	return 0;
+}
+
+/* Fix everything xfs_dinode_verify cares about. */
+STATIC int
+xrep_dinode_problems(
+	struct xrep_inode	*ri)
+{
+	struct xfs_scrub	*sc = ri->sc;
+	int			error;
+
+	error = xrep_dinode_core(ri);
+	if (error)
+		return error;
+
+	/* We had to fix a totally busted inode, schedule quotacheck. */
+	if (XFS_IS_UQUOTA_ON(sc->mp))
+		xrep_force_quotacheck(sc, XFS_DQTYPE_USER);
+	if (XFS_IS_GQUOTA_ON(sc->mp))
+		xrep_force_quotacheck(sc, XFS_DQTYPE_GROUP);
+	if (XFS_IS_PQUOTA_ON(sc->mp))
+		xrep_force_quotacheck(sc, XFS_DQTYPE_PROJ);
+
+	return 0;
+}
+
+/*
+ * Fix problems that the verifiers don't care about.  In general these are
+ * errors that don't cause problems elsewhere in the kernel that we can easily
+ * detect, so we don't check them all that rigorously.
+ */
+
+/* Make sure block and extent counts are ok. */
+STATIC int
+xrep_inode_blockcounts(
+	struct xfs_scrub	*sc)
+{
+	struct xfs_ifork	*ifp;
+	xfs_filblks_t		count;
+	xfs_filblks_t		acount;
+	xfs_extnum_t		nextents;
+	int			error;
+
+	trace_xrep_inode_blockcounts(sc);
+
+	/* Set data fork counters from the data fork mappings. */
+	error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_DATA_FORK,
+			&nextents, &count);
+	if (error)
+		return error;
+	if (xfs_is_reflink_inode(sc->ip)) {
+		/*
+		 * data fork blockcount can exceed physical storage if a user
+		 * reflinks the same block over and over again.
+		 */
+		;
+	} else if (XFS_IS_REALTIME_INODE(sc->ip)) {
+		if (count >= sc->mp->m_sb.sb_rblocks)
+			return -EFSCORRUPTED;
+	} else {
+		if (count >= sc->mp->m_sb.sb_dblocks)
+			return -EFSCORRUPTED;
+	}
+	error = xrep_ino_ensure_extent_count(sc, XFS_DATA_FORK, nextents);
+	if (error)
+		return error;
+	sc->ip->i_df.if_nextents = nextents;
+
+	/* Set attr fork counters from the attr fork mappings. */
+	ifp = xfs_ifork_ptr(sc->ip, XFS_ATTR_FORK);
+	if (ifp) {
+		error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_ATTR_FORK,
+				&nextents, &acount);
+		if (error)
+			return error;
+		if (count >= sc->mp->m_sb.sb_dblocks)
+			return -EFSCORRUPTED;
+		error = xrep_ino_ensure_extent_count(sc, XFS_ATTR_FORK,
+				nextents);
+		if (error)
+			return error;
+		ifp->if_nextents = nextents;
+	} else {
+		acount = 0;
+	}
+
+	sc->ip->i_nblocks = count + acount;
+	return 0;
+}
+
+/* Check for invalid uid/gid/prid. */
+STATIC void
+xrep_inode_ids(
+	struct xfs_scrub	*sc)
+{
+	bool			dirty = false;
+
+	trace_xrep_inode_ids(sc);
+
+	if (!uid_valid(VFS_I(sc->ip)->i_uid)) {
+		i_uid_write(VFS_I(sc->ip), 0);
+		dirty = true;
+		if (XFS_IS_UQUOTA_ON(sc->mp))
+			xrep_force_quotacheck(sc, XFS_DQTYPE_USER);
+	}
+
+	if (!gid_valid(VFS_I(sc->ip)->i_gid)) {
+		i_gid_write(VFS_I(sc->ip), 0);
+		dirty = true;
+		if (XFS_IS_GQUOTA_ON(sc->mp))
+			xrep_force_quotacheck(sc, XFS_DQTYPE_GROUP);
+	}
+
+	if (sc->ip->i_projid == -1U) {
+		sc->ip->i_projid = 0;
+		dirty = true;
+		if (XFS_IS_PQUOTA_ON(sc->mp))
+			xrep_force_quotacheck(sc, XFS_DQTYPE_PROJ);
+	}
+
+	/* strip setuid/setgid if we touched any of the ids */
+	if (dirty)
+		VFS_I(sc->ip)->i_mode &= ~(S_ISUID | S_ISGID);
+}
+
+static inline void
+xrep_clamp_timestamp(
+	struct xfs_inode	*ip,
+	struct timespec64	*ts)
+{
+	ts->tv_nsec = clamp_t(long, ts->tv_nsec, 0, NSEC_PER_SEC);
+	*ts = timestamp_truncate(*ts, VFS_I(ip));
+}
+
+/* Nanosecond counters can't have more than 1 billion. */
+STATIC void
+xrep_inode_timestamps(
+	struct xfs_inode	*ip)
+{
+	struct timespec64	tstamp;
+	struct inode		*inode = VFS_I(ip);
+
+	tstamp = inode_get_atime(inode);
+	xrep_clamp_timestamp(ip, &tstamp);
+	inode_set_atime_to_ts(inode, tstamp);
+
+	tstamp = inode_get_mtime(inode);
+	xrep_clamp_timestamp(ip, &tstamp);
+	inode_set_mtime_to_ts(inode, tstamp);
+
+	tstamp = inode_get_ctime(inode);
+	xrep_clamp_timestamp(ip, &tstamp);
+	inode_set_ctime_to_ts(inode, tstamp);
+
+	xrep_clamp_timestamp(ip, &ip->i_crtime);
+}
+
+/* Fix inode flags that don't make sense together. */
+STATIC void
+xrep_inode_flags(
+	struct xfs_scrub	*sc)
+{
+	uint16_t		mode;
+
+	trace_xrep_inode_flags(sc);
+
+	mode = VFS_I(sc->ip)->i_mode;
+
+	/* Clear junk flags */
+	if (sc->ip->i_diflags & ~XFS_DIFLAG_ANY)
+		sc->ip->i_diflags &= ~XFS_DIFLAG_ANY;
+
+	/* NEWRTBM only applies to realtime bitmaps */
+	if (sc->ip->i_ino == sc->mp->m_sb.sb_rbmino)
+		sc->ip->i_diflags |= XFS_DIFLAG_NEWRTBM;
+	else
+		sc->ip->i_diflags &= ~XFS_DIFLAG_NEWRTBM;
+
+	/* These only make sense for directories. */
+	if (!S_ISDIR(mode))
+		sc->ip->i_diflags &= ~(XFS_DIFLAG_RTINHERIT |
+					  XFS_DIFLAG_EXTSZINHERIT |
+					  XFS_DIFLAG_PROJINHERIT |
+					  XFS_DIFLAG_NOSYMLINKS);
+
+	/* These only make sense for files. */
+	if (!S_ISREG(mode))
+		sc->ip->i_diflags &= ~(XFS_DIFLAG_REALTIME |
+					  XFS_DIFLAG_EXTSIZE);
+
+	/* These only make sense for non-rt files. */
+	if (sc->ip->i_diflags & XFS_DIFLAG_REALTIME)
+		sc->ip->i_diflags &= ~XFS_DIFLAG_FILESTREAM;
+
+	/* Immutable and append only?  Drop the append. */
+	if ((sc->ip->i_diflags & XFS_DIFLAG_IMMUTABLE) &&
+	    (sc->ip->i_diflags & XFS_DIFLAG_APPEND))
+		sc->ip->i_diflags &= ~XFS_DIFLAG_APPEND;
+
+	/* Clear junk flags. */
+	if (sc->ip->i_diflags2 & ~XFS_DIFLAG2_ANY)
+		sc->ip->i_diflags2 &= ~XFS_DIFLAG2_ANY;
+
+	/* No reflink flag unless we support it and it's a file. */
+	if (!xfs_has_reflink(sc->mp) || !S_ISREG(mode))
+		sc->ip->i_diflags2 &= ~XFS_DIFLAG2_REFLINK;
+
+	/* DAX only applies to files and dirs. */
+	if (!(S_ISREG(mode) || S_ISDIR(mode)))
+		sc->ip->i_diflags2 &= ~XFS_DIFLAG2_DAX;
+
+	/* No reflink files on the realtime device. */
+	if (sc->ip->i_diflags & XFS_DIFLAG_REALTIME)
+		sc->ip->i_diflags2 &= ~XFS_DIFLAG2_REFLINK;
+}
+
+/*
+ * Fix size problems with block/node format directories.  If we fail to find
+ * the extent list, just bail out and let the bmapbtd repair functions clean
+ * up that mess.
+ */
+STATIC void
+xrep_inode_blockdir_size(
+	struct xfs_scrub	*sc)
+{
+	struct xfs_iext_cursor	icur;
+	struct xfs_bmbt_irec	got;
+	struct xfs_ifork	*ifp;
+	xfs_fileoff_t		off;
+	int			error;
+
+	trace_xrep_inode_blockdir_size(sc);
+
+	error = xfs_iread_extents(sc->tp, sc->ip, XFS_DATA_FORK);
+	if (error)
+		return;
+
+	/* Find the last block before 32G; this is the dir size. */
+	ifp = xfs_ifork_ptr(sc->ip, XFS_DATA_FORK);
+	off = XFS_B_TO_FSB(sc->mp, XFS_DIR2_SPACE_SIZE);
+	if (!xfs_iext_lookup_extent_before(sc->ip, ifp, &off, &icur, &got)) {
+		/* zero-extents directory? */
+		return;
+	}
+
+	off = got.br_startoff + got.br_blockcount;
+	sc->ip->i_disk_size = min_t(loff_t, XFS_DIR2_SPACE_SIZE,
+			XFS_FSB_TO_B(sc->mp, off));
+}
+
+/* Fix size problems with short format directories. */
+STATIC void
+xrep_inode_sfdir_size(
+	struct xfs_scrub	*sc)
+{
+	struct xfs_ifork	*ifp;
+
+	trace_xrep_inode_sfdir_size(sc);
+
+	ifp = xfs_ifork_ptr(sc->ip, XFS_DATA_FORK);
+	sc->ip->i_disk_size = ifp->if_bytes;
+}
+
+/*
+ * Fix any irregularities in a directory inode's size now that we can iterate
+ * extent maps and access other regular inode data.
+ */
+STATIC void
+xrep_inode_dir_size(
+	struct xfs_scrub	*sc)
+{
+	trace_xrep_inode_dir_size(sc);
+
+	switch (sc->ip->i_df.if_format) {
+	case XFS_DINODE_FMT_EXTENTS:
+	case XFS_DINODE_FMT_BTREE:
+		xrep_inode_blockdir_size(sc);
+		break;
+	case XFS_DINODE_FMT_LOCAL:
+		xrep_inode_sfdir_size(sc);
+		break;
+	}
+}
+
+/* Fix extent size hint problems. */
+STATIC void
+xrep_inode_extsize(
+	struct xfs_scrub	*sc)
+{
+	/* Fix misaligned extent size hints on a directory. */
+	if ((sc->ip->i_diflags & XFS_DIFLAG_RTINHERIT) &&
+	    (sc->ip->i_diflags & XFS_DIFLAG_EXTSZINHERIT) &&
+	    xfs_extlen_to_rtxmod(sc->mp, sc->ip->i_extsize) > 0) {
+		sc->ip->i_extsize = 0;
+		sc->ip->i_diflags &= ~XFS_DIFLAG_EXTSZINHERIT;
+	}
+}
+
+/* Fix any irregularities in an inode that the verifiers don't catch. */
+STATIC int
+xrep_inode_problems(
+	struct xfs_scrub	*sc)
+{
+	int			error;
+
+	error = xrep_inode_blockcounts(sc);
+	if (error)
+		return error;
+	xrep_inode_timestamps(sc->ip);
+	xrep_inode_flags(sc);
+	xrep_inode_ids(sc);
+	/*
+	 * We can now do a better job fixing the size of a directory now that
+	 * we can scan the data fork extents than we could in xrep_dinode_size.
+	 */
+	if (S_ISDIR(VFS_I(sc->ip)->i_mode))
+		xrep_inode_dir_size(sc);
+	xrep_inode_extsize(sc);
+
+	trace_xrep_inode_fixed(sc);
+	xfs_trans_log_inode(sc->tp, sc->ip, XFS_ILOG_CORE);
+	return xrep_roll_trans(sc);
+}
+
+/* Repair an inode's fields. */
+int
+xrep_inode(
+	struct xfs_scrub	*sc)
+{
+	int			error = 0;
+
+	/*
+	 * No inode?  That means we failed the _iget verifiers.  Repair all
+	 * the things that the inode verifiers care about, then retry _iget.
+	 */
+	if (!sc->ip) {
+		struct xrep_inode	*ri = sc->buf;
+
+		ASSERT(ri != NULL);
+
+		error = xrep_dinode_problems(ri);
+		if (error)
+			return error;
+
+		/* By this point we had better have a working incore inode. */
+		if (!sc->ip)
+			return -EFSCORRUPTED;
+	}
+
+	xfs_trans_ijoin(sc->tp, sc->ip, 0);
+
+	/* If we found corruption of any kind, try to fix it. */
+	if ((sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) ||
+	    (sc->sm->sm_flags & XFS_SCRUB_OFLAG_XCORRUPT)) {
+		error = xrep_inode_problems(sc);
+		if (error)
+			return error;
+	}
+
+	/* See if we can clear the reflink flag. */
+	if (xfs_is_reflink_inode(sc->ip)) {
+		error = xfs_reflink_clear_inode_flag(sc->ip, &sc->tp);
+		if (error)
+			return error;
+	}
+
+	return xrep_defer_finish(sc);
+}