Messages in this thread | | | Date | Thu, 26 Mar 2015 15:12:32 -0400 | Subject | Re: [PATCH v7 0/5] vfs: Non-blockling buffered fs read (page cache only) | From | Milosz Tanski <> |
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On Thu, Mar 26, 2015 at 7:55 AM, Christoph Hellwig <hch@infradead.org> wrote: > > On Mon, Mar 16, 2015 at 02:27:10PM -0400, Milosz Tanski wrote: > > This patchset introduces two new syscalls preadv2 and pwritev2. They are the > > same syscalls as preadv and pwrite but with a flag argument. Additionally, > > preadv2 implements an extra RWF_NONBLOCK flag. > > There was some arugment that we just don't wait and don't have the > classic unix "blocking" semantics. Maybe it's time to bite the bullet > and rename it to RWF_DONTWAIT? (I personally dont really care).
Sure. It is in line with the MSG_DONTWAIT flag for sendmsg() which this whole idea is based on anyways.
> > > Second this probably needs to be on top of Al's for-next tree: > > https://git.kernel.org/cgit/linux/kernel/git/viro/vfs.git/log/?h=for-next > > Note that this has a flags field in struct kiocb, so we could just use > that for the flags.
Okay I started rebasing the patches on-top of that. I did see that there is a new flags field "ki_flags". I see that there's already a IOCB_EVENTFD flag.
Did you see you Andres' question about making the flags a enum? I usually wouldn't do that, because C++ is stronger when it comes enums, you can't combine them then assignment them to an enum without a cast. But in the kernel this doesn't matter.
> > > Otherwise this version look fine to me, let's get it merged! > > Al, are yo ready to pick this up? I'd hate to miss another merge > window.
Just got back from vacation today, I'll try to get this out before the end of the week. I also have to make some adjustments to xfs-tests (to push preadv2 into xfs_io).
-- Milosz Tanski CTO 16 East 34th Street, 15th floor New York, NY 10016
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