On Wed, Jan 04, 2012 at 12:27:18AM -0500, Ted Ts'o wrote: > On Wed, Jan 04, 2012 at 03:53:18PM +1100, Dave Chinner wrote: > > > > xfs_fsr doesn't use these donor files to avoid mtime updates - it > > uses invisible IO (i.e. O_NOATIME|O_NOCMTIME) to do that. > > O_NOCMTIME doesn't exist yet. From include/linux/fs.h: > > /* > * Don't update ctime and mtime. > * > * Currently a special hack for the XFS open_by_handle ioctl, but we'll > * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. > */ > #define FMODE_NOCMTIME ((__force fmode_t)0x800) > > I'd have to check, but it wouldn't surprise me if glibc is filtering > out all fcntl flags it doesn't understand, so for now, this is an > XFS-only special... Sounds to me like e2defrag needs it, so perhaps it should finally be made a proper open flag like the comment says rather than inventing some other way of solving the problem.... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
