xfs: simplify xlog_recover_inode_ra_pass2

Don't bother to allocate memory and convert the log item when we
only need the block number and the length.  Just extract them directly
and call xlog_buf_readahead separately in each branch.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/xfs_log_recover.c

@@ -3890,22 +3890,17 @@ xlog_recover_inode_ra_pass2(
 	struct xlog                     *log,
 	struct xlog_recover_item        *item)
 {
-	struct xfs_inode_log_format	ilf_buf;
-	struct xfs_inode_log_format	*ilfp;
-	int			error;
-
 	if (item->ri_buf[0].i_len == sizeof(struct xfs_inode_log_format)) {
-		ilfp = item->ri_buf[0].i_addr;
+		struct xfs_inode_log_format	*ilfp = item->ri_buf[0].i_addr;
+
+		xlog_buf_readahead(log, ilfp->ilf_blkno, ilfp->ilf_len,
+				   &xfs_inode_buf_ra_ops);
 	} else {
-		ilfp = &ilf_buf;
-		memset(ilfp, 0, sizeof(*ilfp));
-		error = xfs_inode_item_format_convert(&item->ri_buf[0], ilfp);
-		if (error)
-			return;
-	}
+		struct xfs_inode_log_format_32	*ilfp = item->ri_buf[0].i_addr;
 
 		xlog_buf_readahead(log, ilfp->ilf_blkno, ilfp->ilf_len,
 				   &xfs_inode_buf_ra_ops);
+	}
 }
 
 STATIC void