Adding upstream version 6.8.9.upstream/6.8.9

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

1 files changed, 202 insertions, 0 deletions

diff --git a/fs/xfs/scrub/rtbitmap_repair.c b/fs/xfs/scrub/rtbitmap_repair.c
new file mode 100644
index 0000000000..46f5d5f605
--- /dev/null
+++ b/fs/xfs/scrub/rtbitmap_repair.c
@@ -0,0 +1,202 @@
+// 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);
+}