Re: Doubts about File Systems on FIASCO on ARM (Cortex-A15)

Hi.

Ext2 or even FAT should be fairly straight forward to implement as well.
You can then hook it up into the VFS system in L4Re. You will have to
write the block device driver as well, for whatever persistent storage
you want to use on your ARM system.


Best regards,
Johan

On Thu, 2014-06-19 at 10:34 -0500, Jorge Ventura wrote:
> I think that this is something that has to be implemented. If I
> understand correctly this matter, any filesystem device driver, except
> the memory filesystems you mention before has to be written from
> scratch as a server at the top of Fiasco.OC.
> 
> 
> I don't know if you are planning to go that far but one idea (and I
> have personal interest on that) is to try to port or rewrite the minix
> 3 file system from Minix3 to Fiasco.OC. A good reason to do that is
> because you can find a detailed explanation in the book
> 
> "Operating Systems, Design and Implementation"
> 
>   Andrew S.Tanenbaum
> 
> 
> in Chapter 5, a detailed description about minix 3 filesystem and the
> implementation as well.
> 
> 
> 
> On Thu, Jun 19, 2014 at 9:55 AM, Maria Soler
> <[email protected]> wrote:
>         Thanks, Jorge Ventura. Yes, you are right. I am sorry, I meant
>         L4re. I am used to discuss about the whole system calling it
>         FIASCO (just as most people do with Linux and its different
>         distributions). So I will rephrase my question a bit more
>         precisely:
>         
>         I need to create persistent files that are written in disk
>         from applications running on L4re. I would also need to load
>         (these or other) files from disk at run time. I have already
>         created an application that reads and writes from files saved
>         both in rom and in a tmpfs, but I don't know how to make
>         persistent files.
>         
>         
>         
>         On Thu, Jun 19, 2014 at 4:12 PM, Jorge Ventura
>         <[email protected]> wrote:
>                 Hi Maria,
>                 
>                 I think that if you watch this presentation
>                 http://youtu.be/SyOcmVamsmI you will find answers to
>                 many of your questions. Specially in the slide "Kernel
>                 vs. Operating System" it's explain that Fiasco.OC is
>                 just the kernel that contains two device drivers, UART
>                 for basic console and timer to be used by scheduler,
>                 any other device driver has to be implemented to run
>                 outside the kernel level.
>                 
>                 
>                 Ventura
>                 
>                 
>                 
>                 On Thu, Jun 19, 2014 at 7:44 AM, Maria Soler
>                 <[email protected]> wrote:
>                 
>                         Hello,
>                         
>                         
>                         I would need to use file system facilities,
>                         but I am not sure how this is done. I can
>                         already use rom/ and also tmpfs, but neither
>                         is exactly what I need. I need to create
>                         persistent files that are written in disk from
>                         applications running on FIASCO (directly, not
>                         using L4Linux as an intermediary). I would
>                         also need to load (these or other) files from
>                         disk in run time (loading all files as modules
>                         in rom may not be the best solution, specially
>                         since we need to create new files "on the go"
>                         and be able to load them from other
>                         applications.
>                         
>                         
>                         Is there any module/library/whatever in FIASCO
>                         that offers this? If there is one, how can we
>                         use it/where can we find information about it?
>                         In case this is relevant, our applications are
>                         in C and we are to run FIASCO in TrustZone
>                         Crotex-A15 (in secure mode).
>                         
>                         
>                         Best regards,
>                         
>                         María.
>                         
>                         
>                         
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>                         
>                 
>                 
>         
>         
> 
> 
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