On Thu, Jan 8, 2015 at 5:49 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > On Tue, Jan 06, 2015 at 12:47:14AM -0800, Andrew Morton wrote: >> > progress, which is a bit frustrating. >> >> I took a look at pread2() as well and I have two main issues: >> >> - The patchset includes a pwrite2() syscall which has nothing to do >> with nonblocking reads and which was poorly described and had little >> justification for inclusion. > > It allows to do O_SYNC writes on a per-I/O basis. This is very useful > for file servers (smb, cifs) as well as storage target devices. This would be particularly useful for SMB3 as the protocol now allows write-through vs. no-write-through flag on every write request (not just on an open, it can be changed on a particular i/o to write-through). There is also a cache/no-cache hint that can be sent on reads/writes in the newest SMB3 dialect well (but it is less clear to me how we would ever decide to set that on the Linux client). -- Thanks, Steve -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>