Large file size issues with Samba client.

[Steven French]

Interesting to see what happens over the network on that - to windows
servers it looks like the 1st write at a high offset (at least for a
non-sparse file) causes huge delays - potentially causing the write to
timeout.    From poking around with the NT IOCTs it looks like they have
not only the sparse bit that is a hint that most ranges are unallocated
(assumed zero) but useful calls to query the non-zero ranges.    There is
probably a way to accomplish the same thing as you note.



Steve French
Senior Software Engineer
Linux Technology Center - IBM Austin
phone: 512-838-2294
email: sfrench at us.ibm.com