Date: Thu, 14 Aug 2014 22:52:33 +0400 From: Roman Bogorodskiy <novel@FreeBSD.org> To: freebsd-fs@freebsd.org Subject: O_NONBLOCK on zfs volume Message-ID: <20140814185232.GB7913@kloomba>
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Hi,
I have a zfs volume of type 'dev':
$ zfs get type,volmode test/vol5
NAME PROPERTY VALUE SOURCE
test/vol5 type volume -
test/vol5 volmode dev local
$
I'm trying to set O_NONBLOCK on its device, a sample program I use looks
like this:
int main(int argc, char **argv) {
int fd = open("/dev/zvol/test/vol5", O_RDONLY);
int ret = fcntl(fd, F_SETFL, O_NONBLOCK);
if (ret < 0)
perror("fcntl");
}
When I run it I get:
fcntl: Inappropriate ioctl for device
Could anybody please describe what's the reason of this behaviour?
Roman Bogorodskiy
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