On 2015-06-14 06:05, Duncan wrote: > Goffredo Baroncelli posted on Sat, 13 Jun 2015 17:09:19 +0200 as > excerpted: > >> My attempt followed a different idea: the mount helper waits the devices >> if needed, or if it is the case it mounts the filesystem in degraded >> mode. >> All devices are passed as mount arguments (--device=/dev/sdX), there is >> no a device registration: this avoids all these problems. >> >> [*] http://permalink.gmane.org/gmane.comp.file-systems.btrfs/40767 > > But /dev/sdX doesn't always work, because, for instance, my usual /dev/sdb > was slow to respond on my last boot, and currently appears as /dev/sdf, > with sdb/c/d/e being my (multi-type) sdcard, etc, adapter, medialess.
Please give a look to my patch. You may mount the filesystem in different way: - by device (/dev/sdxxx) - by UUID (UUID=) - by LABEL (LABEL=) The helper finds the right devices and (eventually) waits for the other devices. When it has collected all the devices, these are passed to the kernel via the "device=/dev/sdx" mount option. So the registration would not be needed anymore. > > Tho if /dev/disk/by-*/* works, I could use that. Tho AFAIK it's udev > that fills that in, so udev would be necessary. I never wrote that udev is not necessary. I think only that relying to udev to handling a multi-volume filesystem is too complicated. The responsibility is spread in too much layer. -- gpg @keyserver.linux.it: Goffredo Baroncelli <kreijackATinwind.it> Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
