On 18/08/2015 11:53, Ilya Dryomov wrote: > On Tue, Aug 18, 2015 at 12:46 AM, Loic Dachary <loic@xxxxxxxxxxx> wrote: >> Hi Ilya, >> >> For regular devices such as /dev/vdb2 or /dev/sda3, do you think it is safe to use /sys/dev/block/M:m/partition to figure out the partition number ? Or could it vary depending on the disk driver or the partition table layout ? Or the kernel version ? > > Yes, I think it is. "partition" was added specifically for finding out > partition numbers after extended devt scheme was merged, because it > made it impossible to use arithmetic on minor numbers. That happened > around 2.6.27 - 2.6.28, so it's a more recent one compared to others, > but I don't think you care about anything pre 2.6.32. > > (You could choose not to rely on "partition" and access() "start" for > figuring out if the thing is a partition - it's been around forever, > but then, the only way to figure out the partition index would be to > parse the name, which you want to avoid.) Exactly. Really happy to get rid of the name parsing logic :-) > Thanks, > > Ilya > -- Loïc Dachary, Artisan Logiciel Libre
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