I'm in the process of migrating data to a bcache partition. I've created the backing disk and cache disk, and I used dd to copy data from another partition (of the same size) to the new /dev/bcache0 partition.
Unfortunately, it appears that even though the backing partition /dev/sdb1 is the same size as the source partition, the actual bcache partition /dev/bcache0 is slightly smaller, and the dd operation failed.
Checking the disk reveals the difference between the physical and superblock sizes of /dev/bcache0:
# fsck /dev/bcache0
The filesystem size (according to the superblock) is 122086400 blocks
The physical size of the device is 122086998 blocks
I've been able to increase the size of /dev/sdb1 using parted, however I'm reluctant to do the same with /dev/bcache0 without knowing the implications, and without calculating the new size very carefully.
What's my best course of action from here to get the /dev/bcache0 partition mountable?
There shouldn't have been any data at the end of the source disk, so I'm assuming the data on /dev/bcache0 is intact, but inaccessible due to the partition misconfiguration. Unfortunately I also accidentally deleted the data from the source disk, so I can't migrate it a second time. I have a working backup of all the critical data, but I'd rather see if I can recover the bcache partition before resorting to that.
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