[22/51] xfs_repair: support realtime superblocks

Commit Message

Darrick J. Wong Dec. 23, 2024, 10:17 p.m. UTC

From: Darrick J. Wong <[e-mail]>

Support the realtime superblock feature.

Signed-off-by: "Darrick J. Wong" <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
---
 libxfs/libxfs_api_defs.h |    1 +
 repair/incore.c          |   12 ++++++++++
 repair/phase3.c          |    4 +++
 repair/rt.c              |   54 ++++++++++++++++++++++++++++++++++++++++++++++
 repair/rt.h              |    3 +++
 repair/xfs_repair.c      |    4 +++
 6 files changed, 78 insertions(+)

Patch

diff --git a/libxfs/libxfs_api_defs.h b/libxfs/libxfs_api_defs.h
index 84965106358d61..dbdf5d100ec8e9 100644
--- a/libxfs/libxfs_api_defs.h
+++ b/libxfs/libxfs_api_defs.h
@@ -300,6 +300,7 @@ 
 
 #define xfs_rtfree_extent		libxfs_rtfree_extent
 #define xfs_rtfree_blocks		libxfs_rtfree_blocks
+#define xfs_update_rtsb			libxfs_update_rtsb
 #define xfs_sb_from_disk		libxfs_sb_from_disk
 #define xfs_sb_quota_from_disk		libxfs_sb_quota_from_disk
 #define xfs_sb_read_secondary		libxfs_sb_read_secondary
diff --git a/repair/incore.c b/repair/incore.c
index 2339d49a95773d..5b3d077f50e495 100644
--- a/repair/incore.c
+++ b/repair/incore.c
@@ -220,6 +220,15 @@  set_rtbmap(
 	 (((uint64_t) state) << ((rtx % XR_BB_NUM) * XR_BB)));
 }
 
+static void
+rtsb_init(
+	struct xfs_mount	*mp)
+{
+	/* The first rtx of the realtime device contains the super */
+	if (xfs_has_rtsb(mp) && rt_bmap)
+		set_rtbmap(0, XR_E_INUSE_FS);
+}
+
 static void
 reset_rt_bmap(void)
 {
@@ -245,6 +254,8 @@  init_rt_bmap(
 			mp->m_sb.sb_rextents);
 		return;
 	}
+
+	rtsb_init(mp);
 }
 
 static void
@@ -332,6 +343,7 @@  reset_bmaps(
 
 	if (xfs_has_rtgroups(mp)) {
 		reset_rtg_bmaps(mp);
+		rtsb_init(mp);
 	} else {
 		reset_rt_bmap();
 	}
diff --git a/repair/phase3.c b/repair/phase3.c
index ca4dbee47434c8..3a3ca22de14d26 100644
--- a/repair/phase3.c
+++ b/repair/phase3.c
@@ -17,6 +17,7 @@ 
 #include "progress.h"
 #include "bmap.h"
 #include "threads.h"
+#include "rt.h"
 
 static void
 process_agi_unlinked(
@@ -116,6 +117,9 @@  phase3(
 
 	set_progress_msg(PROG_FMT_AGI_UNLINKED, (uint64_t) glob_agcount);
 
+	if (xfs_has_rtsb(mp) && xfs_has_realtime(mp))
+		check_rtsb(mp);
+
 	/* first clear the agi unlinked AGI list */
 	if (!no_modify) {
 		for (i = 0; i < mp->m_sb.sb_agcount; i++)
diff --git a/repair/rt.c b/repair/rt.c
index 2de6830c931e86..102baa1d5d6186 100644
--- a/repair/rt.c
+++ b/repair/rt.c
@@ -562,3 +562,57 @@  free_rtgroup_inodes(void)
 	for (i = 0; i < XFS_RTGI_MAX; i++)
 		bitmap_free(&rtg_inodes[i]);
 }
+
+void
+check_rtsb(
+	struct xfs_mount	*mp)
+{
+	struct xfs_buf		*bp;
+	int			error;
+
+	error = -libxfs_buf_read_uncached(mp->m_rtdev_targp, XFS_RTSB_DADDR,
+			XFS_FSB_TO_BB(mp, 1), 0, &bp, &xfs_rtsb_buf_ops);
+	if (!error) {
+		libxfs_buf_relse(bp);
+		return;
+	}
+
+	if (no_modify) {
+		do_warn(_("would rewrite realtime superblock\n"));
+		return;
+	}
+
+	/*
+	 * Rewrite the rt superblock so that an update to the primary fs
+	 * superblock will not get confused by the non-matching rtsb.
+	 */
+	do_warn(_("will rewrite realtime superblock\n"));
+	rewrite_rtsb(mp);
+}
+
+void
+rewrite_rtsb(
+	struct xfs_mount	*mp)
+{
+	struct xfs_buf		*rtsb_bp;
+	struct xfs_buf		*sb_bp = libxfs_getsb(mp);
+	int			error;
+
+	if (!sb_bp)
+		do_error(
+ _("couldn't grab primary sb to update realtime sb\n"));
+
+	error = -libxfs_buf_get_uncached(mp->m_rtdev_targp,
+			XFS_FSB_TO_BB(mp, 1), XFS_RTSB_DADDR, &rtsb_bp);
+	if (error)
+		do_error(
+ _("couldn't grab realtime superblock\n"));
+
+	rtsb_bp->b_maps[0].bm_bn = XFS_RTSB_DADDR;
+	rtsb_bp->b_ops = &xfs_rtsb_buf_ops;
+
+	libxfs_update_rtsb(rtsb_bp, sb_bp);
+	libxfs_buf_mark_dirty(rtsb_bp);
+	libxfs_buf_relse(rtsb_bp);
+	libxfs_buf_relse(sb_bp);
+}
diff --git a/repair/rt.h b/repair/rt.h
index 4dfe4a921d4cdf..865d950b2bf3c4 100644
--- a/repair/rt.h
+++ b/repair/rt.h
@@ -33,4 +33,7 @@  static inline bool is_rtsummary_inode(xfs_ino_t ino)
 void mark_rtgroup_inodes_bad(struct xfs_mount *mp, enum xfs_rtg_inodes type);
 bool rtgroup_inodes_were_bad(enum xfs_rtg_inodes type);
 
+void check_rtsb(struct xfs_mount *mp);
+void rewrite_rtsb(struct xfs_mount *mp);
+
 #endif /* _XFS_REPAIR_RT_H_ */
diff --git a/repair/xfs_repair.c b/repair/xfs_repair.c
index d06bf659df89c1..2a8a72e7027591 100644
--- a/repair/xfs_repair.c
+++ b/repair/xfs_repair.c
@@ -1518,6 +1518,10 @@  _("Note - stripe unit (%d) and width (%d) were copied from a backup superblock.\
 				XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR;
 	}
 
+	/* Always rewrite the realtime superblock */
+	if (xfs_has_rtsb(mp) && xfs_has_realtime(mp))
+		rewrite_rtsb(mp);
+
 	/*
 	 * Done. Flush all cached buffers and inodes first to ensure all
 	 * verifiers are run (where we discover the max metadata LSN), reformat