[PATCH] Avoid deliberate cleanup when sendfile is not supported

[Anoop C S]

On Tue, 2017-01-10 at 19:56 +0530, Anoop C S wrote:
> Hi,
> 
> Please find the attached patch which handles ENOTSUP when 'use sendfile' is incorrectly configured
> for a particular share.
> 
> Tested the patch with vfs_glusterfs module and could confirm that this change avoids the
> server_cleanup and the resulting error from Windows client (Win 8.1).
> 

Attached is a screenshot of the error from Windows with the following log in server:

[2017/01/10 14:29:31.050709,  0] ../source3/smbd/smb2_read.c:248(smb2_sendfile_send_data)
  smb2_sendfile_send_data: sendfile failed for file Fedora-Workstation-Live-x86_64-25-1.3.iso
(Operation not supported) for client ipv4:192.168.122.15:49720. Terminating

> Thanks,
> --Anoop C S.
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