It seems to be quite common. Indeed the partitions of the a GT-B5510 can corrupt, and it result such an issue. You can try to flash the stock rom and erase again all your data with the stock recovery mode and see if you can, after that, mount /data. If not, you'll have to find a .pit file which had to be used with Odin in order to recover your correct partition table.
Good luck !
|rom gt-b5510 custom kernel|
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