[PATCH 24/25] xfs: scrub should cross-reference the realtime bitmap

While we're scrubbing various btrees, cross-reference the records
with the other metadata.

Signed-off-by: Darrick J. Wong <[email protected]>
---
 fs/xfs/libxfs/xfs_rtbitmap.c |   29 +++++++++++++++++++++++++++++
 fs/xfs/xfs_rtalloc.h         |    3 +++
 fs/xfs/xfs_scrub.c           |    9 +++++++++
 3 files changed, 41 insertions(+)


diff --git a/fs/xfs/libxfs/xfs_rtbitmap.c b/fs/xfs/libxfs/xfs_rtbitmap.c
index f4b68c0..0f95c19 100644
--- a/fs/xfs/libxfs/xfs_rtbitmap.c
+++ b/fs/xfs/libxfs/xfs_rtbitmap.c
@@ -1016,3 +1016,32 @@ xfs_rtfree_extent(
 	}
 	return 0;
 }
+
+/* Is the given extent all free? */
+int
+xfs_rtbitmap_extent_is_free(
+	struct xfs_mount		*mp,
+	xfs_rtblock_t			start,
+	xfs_rtblock_t			len,
+	bool				*is_free)
+{
+	xfs_rtblock_t			end;
+	xfs_extlen_t			clen;
+	int				matches;
+	int				error;
+
+	*is_free = false;
+	while (len) {
+		clen = len > ~0U ? ~0U : len;
+		error = xfs_rtcheck_range(mp, NULL, start, clen, 1, &end,
+				&matches);
+		if (error || !matches || end < start + clen)
+			return error;
+
+		len -= end - start;
+		start = end + 1;
+	}
+
+	*is_free = true;
+	return error;
+}
diff --git a/fs/xfs/xfs_rtalloc.h b/fs/xfs/xfs_rtalloc.h
index 91e48f9..14fd2c3 100644
--- a/fs/xfs/xfs_rtalloc.h
+++ b/fs/xfs/xfs_rtalloc.h
@@ -121,6 +121,8 @@ int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log,
 int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp,
 		     xfs_rtblock_t start, xfs_extlen_t len,
 		     struct xfs_buf **rbpp, xfs_fsblock_t *rsb);
+int xfs_rtbitmap_extent_is_free(struct xfs_mount *mp,
+		xfs_rtblock_t start, xfs_rtblock_t len, bool *is_free);
 
 
 #else
@@ -129,6 +131,7 @@ int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp,
 # define xfs_rtpick_extent(m,t,l,rb)                    (ENOSYS)
 # define xfs_growfs_rt(mp,in)                           (ENOSYS)
 # define xfs_rtbuf_get(m,t,b,i,p)                       (ENOSYS)
+# define xfs_rtbitmap_extent_is_free(m,s,l,i)           (ENOSYS)
 static inline int		/* error */
 xfs_rtmount_init(
 	xfs_mount_t	*mp)	/* file system mount structure */
diff --git a/fs/xfs/xfs_scrub.c b/fs/xfs/xfs_scrub.c
index ff55d8c..e4e3210 100644
--- a/fs/xfs/xfs_scrub.c
+++ b/fs/xfs/xfs_scrub.c
@@ -2304,6 +2304,7 @@ xfs_scrub_bmap_extent(
 	xfs_extlen_t			flen;
 	bool				is_freesp;
 	bool				has_inodes;
+	bool				is_free;
 	unsigned int			rflags;
 	int				has_rmap;
 	int				has_refcount;
@@ -2390,6 +2391,14 @@ xfs_scrub_bmap_extent(
 			xfs_btree_del_cursor(xcur, err2 ? XFS_BTREE_ERROR :
 							  XFS_BTREE_NOERROR);
 		}
+	} else {
+		/* Cross-reference with rtbitmap. */
+		xfs_ilock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
+		err2 = xfs_rtbitmap_extent_is_free(mp, irec->br_startblock,
+				irec->br_blockcount, &is_free);
+		if (!err2)
+			XFS_BTREC_SCRUB_CHECK(&info->bs, !is_free);
+		xfs_iunlock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
 	}
 
 	/* Cross-reference with rmapbt. */

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