> On 16 Jul 2019, at 2:46 PM, Nikolay Borisov <nborisov@xxxxxxxx> wrote: > > > > On 16.07.19 г. 4:26 ч., Qu Wenruo wrote: >> >> >> On 2019/7/15 下午11:09, Nikolay Borisov wrote: >>> >>> >>> On 15.07.19 г. 17:42 ч., Anand Jain wrote: >>>> To help debug device scan issues, add verbose option to btrfs device scan. >>>> >>>> Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx> >>> >>> I fail to see what this patch helps for. We get the path in case of >>> errors, in case of success what good could the path be ? >> >> AFAIK it would provide an easy way to debug blkid related bug. >> >> E.g. scan only works on some devices and misses some devices. > > In this case (and I already debugged one such case) it's invaluable to > use LIBBLKID_DEBUG environment variable, the debug string added in this > patch won't help in this particular case. > > <snip> Export LIBBLKID_DEBUG=all is good for debugging libblkid itself, btrfs dev scan -v provides a confirmation on which devices were scanned and their paths. Thanks, Anand
