On Tue, Jul 20, 2004 at 10:27:57AM -0700, Shesha Sreenivasamurthy wrote: > I am having trouble with O_DIRECT. Trying to read or write from a block > device partition. > > 1. Can O_DIRECT be used on a plain block device partition say > "/dev/sda11" without having a filesystem on it. As fas as I know, yes, but be aware that O_DIRECT requires page aligned addresses! (an integral of 4096 on most systems). > 2. If no file system is created then what should be the softblock size. > I am using the IOCTL "BLKBSZGET". Is this correct? No idea what you mean - but see above about the aligned addresses. > 3. Can we use SEEK_END with O_DIRECT on a partition without filesystem. I see no reason why not. Good luck! -- http://www.PowerDNS.com Open source, database driven DNS Software http://lartc.org Linux Advanced Routing & Traffic Control HOWTO -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
