On Thu, Mar 3, 2016 at 8:54 PM, Kouhei Kaigai <kai...@ak.jp.nec.com> wrote: > I found one other, but tiny, problem to implement SSD-to-GPU direct > data transfer feature under the PostgreSQL storage. > > Extension cannot know the raw file descriptor opened by smgr. > > I expect an extension issues an ioctl(2) on the special device file > on behalf of the special kernel driver, to control the P2P DMA. > This ioctl(2) will pack file descriptor of the DMA source and some > various information (like base position, range, destination device > pointer, ...). > > However, the raw file descriptor is wrapped in the fd.c, instead of > the File handler, thus, not visible to extension. oops... > > The attached patch provides a way to obtain raw file descriptor (and > relevant flags) of a particular File virtual file descriptor on > PostgreSQL. (No need to say, extension has to treat the raw descriptor > carefully not to give an adverse effect to the storage manager.) > > How about this tiny enhancement?
Why not FileDescriptor(), FileFlags(), FileMode() as separate functions like FilePathName()? -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers