xfs: always use unwritten extents for direct I/O writes

To allow aio writes beyond i_size we need to create unwritten extents for
newly allocated blocks, similar to how we already do inside i_size.

Instead of adding another special case we now use unwritten extents
unconditionally.  This also marks the end of directly allocation data
extents in all of XFS - we now always use either delalloc or unwritten
extents.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 22d1cbe..3b80eba 100644 (file)
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -128,7 +128,6 @@ xfs_iomap_write_direct(
        xfs_fsblock_t   firstfsb;
        xfs_extlen_t    extsz, temp;
        int             nimaps;
-       int             bmapi_flag;
        int             quota_flag;
        int             rt;
        xfs_trans_t     *tp;
@@ -200,18 +199,15 @@ xfs_iomap_write_direct(
 
        xfs_trans_ijoin(tp, ip, 0);
 
-       bmapi_flag = 0;
-       if (offset < XFS_ISIZE(ip) || extsz)
-               bmapi_flag |= XFS_BMAPI_PREALLOC;
-
        /*
         * From this point onwards we overwrite the imap pointer that the
         * caller gave to us.
         */
        xfs_bmap_init(&free_list, &firstfsb);
        nimaps = 1;
-       error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, bmapi_flag,
-                               &firstfsb, 0, imap, &nimaps, &free_list);
+       error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
+                               XFS_BMAPI_PREALLOC, &firstfsb, 0,
+                               imap, &nimaps, &free_list);
        if (error)
                goto out_bmap_cancel;