Re: [B2-devel] Preventing double-mounts

[Robert M. <mr...@gm...>]

I like the first idea, because it is careful.

The second idea will make volumes get locked, and therefore
permanently damaged" (unmountable) the very first time SheepShaver or
BasiliskII crashes.

On 6/24/12, Dave Vasilevsky <va...@us...> wrote:
> On a couple of occasions, disk images of mine have become corrupted
> due to accidental double-mounting in SheepShaver and/or BasiliskII. I
> propose we try and minimize the chance of this happening. Two
> situations need to be dealt with:
>
> 1. The host OS and SheepShaver (or B2) both have the disk mounted. We
> already try to prevent this with is_drive_mounted(), but it only works
> on Linux hosts, and only with real devices, not loop mounts.
> [in OS X we can use] getmntinfo(3) [or] IOKit [(using] undocumented IOKit properties
> [...]

> 2. Multiple instances of B2/SS using the same disk image. We should be
> able to prevent this by using advisory locks in Sys_open().
>
> What do folks think? Worth working on?

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