Hi Sage, On 15/08/2015 16:28, Sage Weil wrote: > On Sat, 15 Aug 2015, Loic Dachary wrote: >> Hi, >> >> Is there a portable and consistent way to figure out if a given /dev/XXX >> path (for instance /dev/dm-1) is a partition of a whole device ? >> Although checking /sys/block/dm-1/dm/name for a number at the end (like >> mpatha1 or mpatha2) would probably work, it feels like a fragile hack. >> Looking into /sys/block/dm-1/slaves will lead to >> /sys/block/dm-1/slaves/dm-0 and we can check that >> /sys/block/dm-*/subsystem is class/block. But that does not necessarily >> mean dm-1 is a partition of dm-0, just that it's a slave of dm-0. > > Take a look at is_partition in ceph-disk, whih is the best I came up with. > Basically it checks if the device name appears as /sys/block/*/$foo... That is consistently updated for /dev/sdb or /dev/vdb but things are different when using multipath. I'll rely on /sys/block/dm-?/dm/name instead until a better solution is found. Thanks ! > > sage > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Loïc Dachary, Artisan Logiciel Libre
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