Commits on Dec 23, 2021

1. Get the correct size for block devices …

   The function `Size()` of `FileInfo` returns the length in bytes for
   regular files. However if we use a block device, `Size()` will return a
   length of zero.
   
   To chunk a file, we use the size to split the expected work in even
   parts.
   
   For this reason, when we wanted to generate an index from a block
   device, due to the incorrect reported zero size, the whole task was
   carried out by a single Goroutine.
   
   With this commit we use the ioctl `BLKGETSIZE64` to get the correct size
   for block devices.
   
   In a test environment the `make` operation against a block device took 2
   minutes and 20 seconds to complete with the current master branch and
   only 24 seconds with this patch.
   
   Signed-off-by: Ludovico de Nittis <ludovico.denittis@collabora.com>

   

   RyuzakiKK committed Dec 23, 2021
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