h.b.furuseth@usit.uio.no wrote:

This was fixed in LMDB 0.9.9, except: If both O_DIRECT and F_NOCACHE are #defined, both are used. Looks a bit strange. Maybe just one should be used in that case. (Which?) Also I'm still wondering if env_open needs to fail if F_NOCACHE fails.

Anyway, maybe it should be something like this. The "else {}" is in case O_DIRECT is an unsupported dummy definiton:

Isn't that in the wrong order then? What you suggest here will use O_DIRECT even if it's a dummy.

I don't see any reason to fail the operation. They just want to make a copy/backup; even if the optimization of avoiding pollution of the buffer cache can't be done, they still want the copy to happen.

#ifdef O_DIRECT if ((rc = fcntl(newfd, F_GETFL)) != -1) (void) fcntl(newfd, F_SETFL, rc | O_DIRECT); else #endif { #ifdef F_NOCACHE /* __APPLE__ */ (void) fcntl(newfd, F_NOCACHE, 1); #endif }