On 06/12/2010 06:32 PM, Grégoire Sutre wrote: > On 06/07/2010 10:46 PM, Vladimir 'φ-coder/phcoder' Serbinenko wrote: > >> There are two parts of this question: >> 1) Which partition schemes should GRUB be able to read modules and >> payloads from ? It's platform-indepedent and 2 conditions apply: >> - Usage. There are OS which are able to boot from such OS and such >> configuration isn't considered obscure by them. >> - Non-confusability. The risk of false positive of this partition config >> which would prevent normal function is small. >> If at least one condition is met it's worth considering. If both >> conditions are met it should be supported. > > According to these rules, hybrid msdos+gpt partitioning schemes should > be supported. Grub should be able to read files from a GPT partition > even if the protective GPT entry in the MBR is not in the first slot. > It's also the conclusion of the thread [1], but I admit that this thread > is two years old. > Any "hybrid" cofiguration fails the criteria of non confusability. Let's consider a following situation: - I format disk with scheme A and partitions A1, A2, A3 - I get bored and reformat with scheme B and partitios B1, B2, B3, B4. When I did this filesystem on A2 may stay intact - I use grub which supposes that it'shybrid system A+B and save_env's to A2 since it's a valid partition on valid filesystem. But by a bad luck save_env overlaps with superblock of B3 which becomes corrupted. When installed grub sees both partitions A and B it makes sense to allow user to see both of them for recovery purposes but in any case it should be a recommended config. Desync is way too easy. And currently grub isn't changed to new partition notation completely. E.g. during startup prefix is calculated with old syntax and confusing A+B with either A or B is likely to make user drop into rescue shell Also save_env should ensure that no dangerous situation exist. > Grégoire > > [1] http://lists.gnu.org/archive/html/grub-devel/2008-09/msg00101.html > > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > http://lists.gnu.org/mailman/listinfo/grub-devel >
-- Regards Vladimir 'φ-coder/phcoder' Serbinenko
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