xfs: inode scrubber shouldn't bother with raw checks

The inode scrubber tries to _iget the inode prior to running checks.
If that _iget call fails with corruption errors that's an automatic
fail, regardless of whether it was the inode buffer read verifier,
the ifork verifier, or the ifork formatter that errored out.

Therefore, get rid of the raw mode scrub code because it's not needed.
Found by trying to fix some test failures in xfs/379 and xfs/415.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

fs/xfs/scrub/inode.c

@@ -515,72 +515,6 @@ xfs_scrub_dinode(
 	}
 }
 
-/* Map and read a raw inode. */
-STATIC int
-xfs_scrub_inode_map_raw(
-	struct xfs_scrub_context	*sc,
-	xfs_ino_t			ino,
-	struct xfs_buf			**bpp,
-	struct xfs_dinode		**dipp)
-{
-	struct xfs_imap			imap;
-	struct xfs_mount		*mp = sc->mp;
-	struct xfs_buf			*bp = NULL;
-	struct xfs_dinode		*dip;
-	int				error;
-
-	error = xfs_imap(mp, sc->tp, ino, &imap, XFS_IGET_UNTRUSTED);
-	if (error == -EINVAL) {
-		/*
-		 * Inode could have gotten deleted out from under us;
-		 * just forget about it.
-		 */
-		error = -ENOENT;
-		goto out;
-	}
-	if (!xfs_scrub_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
-			XFS_INO_TO_AGBNO(mp, ino), &error))
-		goto out;
-
-	error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
-			imap.im_blkno, imap.im_len, XBF_UNMAPPED, &bp,
-			NULL);
-	if (!xfs_scrub_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
-			XFS_INO_TO_AGBNO(mp, ino), &error))
-		goto out;
-
-	/*
-	 * Is this really an inode?  We disabled verifiers in the above
-	 * xfs_trans_read_buf call because the inode buffer verifier
-	 * fails on /any/ inode record in the inode cluster with a bad
-	 * magic or version number, not just the one that we're
-	 * checking.  Therefore, grab the buffer unconditionally, attach
-	 * the inode verifiers by hand, and run the inode verifier only
-	 * on the one inode we want.
-	 */
-	bp->b_ops = &xfs_inode_buf_ops;
-	dip = xfs_buf_offset(bp, imap.im_boffset);
-	if (xfs_dinode_verify(mp, ino, dip) != NULL ||
-	    !xfs_dinode_good_version(mp, dip->di_version)) {
-		xfs_scrub_ino_set_corrupt(sc, ino, bp);
-		goto out_buf;
-	}
-
-	/* ...and is it the one we asked for? */
-	if (be32_to_cpu(dip->di_gen) != sc->sm->sm_gen) {
-		error = -ENOENT;
-		goto out_buf;
-	}
-
-	*dipp = dip;
-	*bpp = bp;
-out:
-	return error;
-out_buf:
-	xfs_trans_brelse(sc->tp, bp);
-	return error;
-}
-
 /*
  * Make sure the finobt doesn't think this inode is free.
  * We don't have to check the inobt ourselves because we got the inode via
@@ -727,43 +661,33 @@ xfs_scrub_inode(
 	struct xfs_scrub_context	*sc)
 {
 	struct xfs_dinode		di;
-	struct xfs_buf			*bp = NULL;
-	struct xfs_dinode		*dip;
-	xfs_ino_t			ino;
 	int				error = 0;
 
-	/* Did we get the in-core inode, or are we doing this manually? */
-	if (sc->ip) {
-		ino = sc->ip->i_ino;
-		xfs_inode_to_disk(sc->ip, &di, 0);
-		dip = &di;
-	} else {
-		/* Map & read inode. */
-		ino = sc->sm->sm_ino;
-		error = xfs_scrub_inode_map_raw(sc, ino, &bp, &dip);
-		if (error || !bp)
-			goto out;
+	/*
+	 * If sc->ip is NULL, that means that the setup function called
+	 * xfs_iget to look up the inode.  xfs_iget returned a EFSCORRUPTED
+	 * and a NULL inode, so flag the corruption error and return.
+	 */
+	if (!sc->ip) {
+		xfs_scrub_ino_set_corrupt(sc, sc->sm->sm_ino, NULL);
+		return 0;
 	}
 
-	xfs_scrub_dinode(sc, bp, dip, ino);
+	/* Scrub the inode core. */
+	xfs_inode_to_disk(sc->ip, &di, 0);
+	xfs_scrub_dinode(sc, NULL, &di, sc->ip->i_ino);
 	if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 		goto out;
 
-	/* Now let's do the things that require a live inode. */
-	if (!sc->ip)
-		goto out;
-
 	/*
 	 * Look for discrepancies between file's data blocks and the reflink
 	 * iflag.  We already checked the iflag against the file mode when
 	 * we scrubbed the dinode.
 	 */
 	if (S_ISREG(VFS_I(sc->ip)->i_mode))
-		xfs_scrub_inode_check_reflink_iflag(sc, ino, bp);
+		xfs_scrub_inode_check_reflink_iflag(sc, sc->ip->i_ino, NULL);
 
-	xfs_scrub_inode_xref(sc, ino, dip);
+	xfs_scrub_inode_xref(sc, sc->ip->i_ino, &di);
 out:
-	if (bp)
-		xfs_trans_brelse(sc->tp, bp);
 	return error;
 }