Karel Zak <kzak@xxxxxxxxxx> writes: > On Wed, Jul 18, 2007 at 04:15:46PM +0200, Matthias Koenig wrote: >> Let mkswap, mkfs.bfs, mkfs.minix open with O_EXCL if >> used on block devices to prevent writing to the device >> even if they are busy. > > "busy" -- do you mean mounted? mounted or another process having opened the device with O_EXCL. I found this summary of what O_EXCL does on block devices, for reference: http://lkml.org/lkml/2006/2/5/137 > BTW, mkswap and mkfs.minix are checking against /etc/mtab. > > The O_EXCL is not real exclusive lock, it's exclusive lock against > others O_EXCT accesses only. Yes, it's an advisory lock only. But it should make filesystem creation safer, if all mkfs tools use O_EXCL on block devices. E.g. mke2fs is also using O_EXCL. Thanks, Matthias - To unsubscribe from this list: send the line "unsubscribe util-linux-ng" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
