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Re: patch to support >16 bit g/uids on ext2fs wrote:

>    > i recently had need to recover some data from an ext3 that used
>    > uids greater than 16 bits, and discovered they were incorrectly
>    > represented as only 16 bits.
>    > 
>    > after a bit of searching, i noticed that linux has a per-mount
>    > option to disable 32 bit but otherwise has it there by default.
>    > 
>    > since we don't have a similar mount option, i've made it non
>    > optional in our kernel (simple ways to add it welcome.)
>    I wonder if the features bits in struct ext2fs have
>    some bits for the uid/gid extension or not, as LARGEFILE etc.
> i could be wrong, but the code i read indicated it was a
> mount option not a file system option.

With a quick glance at Linux ext2_fs.h, you are right.
Umm, what an awful design...
(what happens if old FS has garbages in unused [ug]id_high!?)

At least should we check e2fs_rev for sanity?
Izumi Tsutsui

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