xfs: scrub the realtime rmapbt

Check the realtime reverse mapping btree against the rtbitmap, and
modify the rtbitmap scrub to check against the rtrmapbt.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 86 insertions, 0 deletions

diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
index 613fb54e723e..ca43dd4f52b2 100644
--- a/fs/xfs/scrub/common.c
+++ b/fs/xfs/scrub/common.c
@@ -35,6 +35,8 @@
 #include "xfs_exchmaps.h"
 #include "xfs_rtbitmap.h"
 #include "xfs_rtgroup.h"
+#include "xfs_rtrmap_btree.h"
+#include "xfs_bmap_util.h"
 #include "scrub/scrub.h"
 #include "scrub/common.h"
 #include "scrub/trace.h"
@@ -791,10 +793,29 @@ xchk_rtgroup_lock(
 	} while (1);
 
 	sr->rtlock_flags = rtglock_flags;
+
+	if (xfs_has_rtrmapbt(sc->mp) && (rtglock_flags & XFS_RTGLOCK_RMAP))
+		sr->rmap_cur = xfs_rtrmapbt_init_cursor(sc->tp, sr->rtg);
+
 	return 0;
 }
 
 /*
+ * Free all the btree cursors and other incore data relating to the realtime
+ * group.  This has to be done /before/ committing (or cancelling) the scrub
+ * transaction.
+ */
+void
+xchk_rtgroup_btcur_free(
+	struct xchk_rt		*sr)
+{
+	if (sr->rmap_cur)
+		xfs_btree_del_cursor(sr->rmap_cur, XFS_BTREE_ERROR);
+
+	sr->rmap_cur = NULL;
+}
+
+/*
  * Unlock the realtime group.  This must be done /after/ committing (or
  * cancelling) the scrub transaction.
  */
@@ -878,6 +899,14 @@ xchk_setup_fs(
 	return xchk_trans_alloc(sc, resblks);
 }
 
+/* Set us up with a transaction and an empty context to repair rt metadata. */
+int
+xchk_setup_rt(
+	struct xfs_scrub	*sc)
+{
+	return xchk_trans_alloc(sc, 0);
+}
+
 /* Set us up with AG headers and btree cursors. */
 int
 xchk_setup_ag_btree(
@@ -1639,3 +1668,60 @@ xchk_inode_rootdir_inum(const struct xfs_inode *ip)
 		return mp->m_metadirip->i_ino;
 	return mp->m_rootip->i_ino;
 }
+
+static int
+xchk_meta_btree_count_blocks(
+	struct xfs_scrub	*sc,
+	xfs_extnum_t		*nextents,
+	xfs_filblks_t		*count)
+{
+	struct xfs_btree_cur	*cur;
+	int			error;
+
+	if (!sc->sr.rtg) {
+		ASSERT(0);
+		return -EFSCORRUPTED;
+	}
+
+	switch (sc->ip->i_metatype) {
+	case XFS_METAFILE_RTRMAP:
+		cur = xfs_rtrmapbt_init_cursor(sc->tp, sc->sr.rtg);
+		break;
+	default:
+		ASSERT(0);
+		return -EFSCORRUPTED;
+	}
+
+	error = xfs_btree_count_blocks(cur, count);
+	xfs_btree_del_cursor(cur, error);
+	if (!error) {
+		*nextents = 0;
+		(*count)--;	/* don't count the btree iroot */
+	}
+	return error;
+}
+
+/* Count the blocks used by a file, even if it's a metadata inode. */
+int
+xchk_inode_count_blocks(
+	struct xfs_scrub	*sc,
+	int			whichfork,
+	xfs_extnum_t		*nextents,
+	xfs_filblks_t		*count)
+{
+	struct xfs_ifork	*ifp = xfs_ifork_ptr(sc->ip, whichfork);
+
+	if (!ifp) {
+		*nextents = 0;
+		*count = 0;
+		return 0;
+	}
+
+	if (ifp->if_format == XFS_DINODE_FMT_META_BTREE) {
+		ASSERT(whichfork == XFS_DATA_FORK);
+		return xchk_meta_btree_count_blocks(sc, nextents, count);
+	}
+
+	return xfs_bmap_count_blocks(sc->tp, sc->ip, whichfork, nextents,
+			count);
+}