Re: [Qemu-devel] [PATCH] 9pfs: don't ignore O_DIRECT flag in the 9pfs server

2017-11-27 Thread Greg Kurz
On Tue, 21 Nov 2017 11:28:29 +0800 jiangyiwen wrote: > On 2017/11/20 18:13, Greg Kurz wrote: > > On Mon, 20 Nov 2017 13:48:59 +0800 > > jiangyiwen wrote: > > > >> Now v9fs in linux has already supported O_DIRECT(v9fs_direct_IO), > >> when guest user open file with O_DIRECT flag and return suc

Re: [Qemu-devel] [PATCH] 9pfs: don't ignore O_DIRECT flag in the 9pfs server

2017-11-20 Thread jiangyiwen
On 2017/11/20 18:13, Greg Kurz wrote: > On Mon, 20 Nov 2017 13:48:59 +0800 > jiangyiwen wrote: > >> Now v9fs in linux has already supported O_DIRECT(v9fs_direct_IO), >> when guest user open file with O_DIRECT flag and return success, >> so user hopes data doesn't pass through page cache, but 9pfs

Re: [Qemu-devel] [PATCH] 9pfs: don't ignore O_DIRECT flag in the 9pfs server

2017-11-20 Thread Greg Kurz
On Mon, 20 Nov 2017 13:48:59 +0800 jiangyiwen wrote: > Now v9fs in linux has already supported O_DIRECT(v9fs_direct_IO), > when guest user open file with O_DIRECT flag and return success, > so user hopes data doesn't pass through page cache, but 9pfs in > qemu ignore direct disk access and use ho