RFC : attach ubi in readonly mode

[Matthieu CASTET]

Hi,

it could be interesting to attach ubi in read-only mode (for example getting ubi
volume info without altering flash).

A solution to do that could be to add an argument to UBI_IOCATT ioctl.

Another solution should be to have a way to switch MTD_WRITEABLE flags.

What do you think a that ?


PS : attached a proof of concept for solution 1
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