CryptoNAS doesn't reread updated partition tables from internal disks

[frisco]

After a change is made to the partition table of an internal disk (IDE or SCSI, for example), the /disks page typically does not show the updated list of partitions. /proc/partitions shows the old set of information as well. The simplest way to fix this is to run

blockdev --rereadpt /dev/sdX

to cause the kernel to refresh its information about partitions after every change CryptoNAS makes to partition tables. (The actual ioctl is called BLKRRPART.) partprobe can also accomplish this, but I don't trust it as much.

[frisco]

Once we figure out the exact syntax for this (possibly in a wrapper function for readability, etc.), a good place to call blockdev would be near the end of __action_finish and __action_easy_setup in partition.py.

[lars]

seems to be fixed since [1160]