xfs: replace E2BIG with EFBIG where appropriate

Many places in the xfs code return E2BIG when they really mean
EFBIG; trying to grow past 16T on a 32 bit machine, for example,
says "Argument list too long" rather than "File too large" which is
not particularly helpful.

Some of these don't make perfect sense as EFBIG either, but still
better than E2BIG IMHO.

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 6be05f7..1644551 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -2247,7 +2247,7 @@
 		cmn_err(CE_WARN, "XFS: realtime mount -- %llu != %llu",
 			(unsigned long long) XFS_BB_TO_FSB(mp, d),
 			(unsigned long long) mp->m_sb.sb_rblocks);
-		return XFS_ERROR(E2BIG);
+		return XFS_ERROR(EFBIG);
 	}
 	error = xfs_read_buf(mp, mp->m_rtdev_targp,
 				d - XFS_FSB_TO_BB(mp, 1),
@@ -2256,7 +2256,7 @@
 		cmn_err(CE_WARN,
 	"XFS: realtime mount -- xfs_read_buf failed, returned %d", error);
 		if (error == ENOSPC)
-			return XFS_ERROR(E2BIG);
+			return XFS_ERROR(EFBIG);
 		return error;
 	}
 	xfs_buf_relse(bp);