From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx> Set the IOMAP_F_COW flag and create the srcmap based on current extents to read from. Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx> --- fs/xfs/xfs_iomap.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 8321733c16c3..13495d8a1ee2 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1006,7 +1006,10 @@ xfs_file_iomap_begin( */ if (directio || imap.br_startblock == HOLESTARTBLOCK) imap = cmap; + else + xfs_bmbt_to_iomap(ip, srcmap, &cmap, false); + iomap->flags |= IOMAP_F_COW; end_fsb = imap.br_startoff + imap.br_blockcount; length = XFS_FSB_TO_B(mp, end_fsb) - offset; } -- 2.16.4
