994b303123
This queries the sector size from libfdisk instead of assuming 512, and uses that when converting from bytes to the offset/size values libfdisk expects. This is an alternative to Tom Yan's #21823, but prefers using libfdisk's own ideas of the sector size instead of going directly to the backing device via ioctls. (libfdisk can after all also operate on regular files, where the sector size concept doesn't necessarily apply the same way.) This also makes the "grain" variable, i.e. how we'll align the partitions. Previously this was hardcoded to 4K, and that still will be the minimum grain we use, but should the sector size be larger than that we'll use the next multiple of the sector size instead.
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