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Need some advice for a filesystem project

 
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alexp



Joined: 17 Apr 2007
Posts: 39
PostPosted: Wed Jul 04, 2007 11:38 pm    Post subject: Need some advice for a filesystem project Reply with quote
Hi everyone,
I'm thinking about implementing a different filesystem for accessing the memory stick, FAT is really not good for flash devices anyway, i'm able to redirect access to ms0 to my own driver, and it works in a test homebrew.
But i can't find a way to make the redirect stable , so that XMB will use it.

I'm using CF 3.40, in 1.50 kernel mode, to bypass the protection against redirecting ms0 of newer firmwares.
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adrahil



Joined: 16 Mar 2006
Posts: 277
PostPosted: Thu Jul 05, 2007 5:15 am    Post subject: Reply with quote
You'll need to reimplement fatmsmod.prx & co.
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J.F.



Joined: 22 Feb 2004
Posts: 2906
PostPosted: Thu Jul 05, 2007 5:40 am    Post subject: Reply with quote
You should probably check for FAT anyway and pass calls along to the old functions (or implement FAT yourself) so that "normal" sticks can also be used by your new fs.
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alexp



Joined: 17 Apr 2007
Posts: 39
PostPosted: Thu Jul 05, 2007 6:22 am    Post subject: Reply with quote
adrahil wrote:
You'll need to reimplement fatmsmod.prx & co.

I don't think that it's really needed, i already can open the raw memstick using sceIoOpen("msstor0:",PSP_O_RDWR,0), so it should be possible to write a driver that acces the raw memory, and call sceAssign("ms0", "my_fs",NULL,IOASSIGN_RDWR,NULL,0)

At this moment i have a prototype driver loaded as a plugin by the custom firmware, it registers the "my_fs" driver, but i can't find a way to call it with my homebrew, if i do

sceIoOpen("my_fs:/whatever",PSP_O_RDWR|PSP_O_CREAT,777)
i got a NODEV error.

Is there anything i'm missing to use a driver registered from a plugin?

It worked perfectly when i was loading the module with pspSdkLoadStartModule from the homebrew
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alexp



Joined: 17 Apr 2007
Posts: 39
PostPosted: Thu Jul 05, 2007 11:10 am    Post subject: Reply with quote
alexp wrote:

At this moment i have a prototype driver loaded as a plugin by the custom firmware, it registers the "my_fs" driver, but i can't find a way to call it with my homebrew, if i do

sceIoOpen("my_fs:/whatever",PSP_O_RDWR|PSP_O_CREAT,777)
i got a NODEV error.

Is there anything i'm missing to use a driver registered from a plugin?

It worked perfectly when i was loading the module with pspSdkLoadStartModule from the homebrew

I've solved this problem, it happens using the 1.50 kernel mode, switching to 3.40 fixes it, but now i need to find out how to circumvent the ms0 redirect protection
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kururin



Joined: 05 Jul 2006
Posts: 36
PostPosted: Mon Jul 09, 2007 2:24 am    Post subject: Reply with quote
Why don't you just delete the current fatms driver, and call your driver the same?

I mean, something like:

sceIoDelDrv("fatms");
sceIoAddDrv(&my_driver); // named "fatms" too

sceIoAssign("ms0:", "msstor0p1:", "fatms0:", IOASSIGN_RDWR, NULL, 0);

Also, the option of replacing fatmsmod of the flash with yours (at least in 3.XX kernel) would be fine, you wouldn't need the assign, because some other module would do it for you.

Btw, can i ask which filesystem are you gonna to implement? Just for curiosity :p
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alexp



Joined: 17 Apr 2007
Posts: 39
PostPosted: Mon Jul 09, 2007 5:47 am    Post subject: Reply with quote
I'm now working on a custom log structured filesytem, which is more adapt to flash memory. It's not easy to implement other log structured filesytem (such as jffs2 or yaffs), because we have no access to the raw memory card, only a block device interface to it. I'm working both to a FUSE implementation of the filesytem under linux and to the psp driver

No plan for a windows port, sorry
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alexp



Joined: 17 Apr 2007
Posts: 39
PostPosted: Wed Jul 11, 2007 11:45 am    Post subject: Reply with quote
hi,
i'm having a bit of problems with my fileystem and i feel i'm missing something.
I'm loading my code as a custom firmware plugin, so in XMB i got correct filesystem size, but if i try to select for example PHOTO, i only get a request for /DCIM, which is not present, so i return 0x80010002 (no such file or directory). I think that i should be getting other dopen request, such as /PSP/PHOTO, so i suspect i'm missing something, should i override something else apart ms0: to make XMB happy?

Thanks a lot for your help guys

Alessandro
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kururin



Joined: 05 Jul 2006
Posts: 36
PostPosted: Wed Jul 11, 2007 5:15 pm    Post subject: Reply with quote
alexp wrote:
hi,
i'm having a bit of problems with my fileystem and i feel i'm missing something.
I'm loading my code as a custom firmware plugin, so in XMB i got correct filesystem size, but if i try to select for example PHOTO, i only get a request for /DCIM, which is not present, so i return 0x80010002 (no such file or directory). I think that i should be getting other dopen request, such as /PSP/PHOTO, so i suspect i'm missing something, should i override something else apart ms0: to make XMB happy?

Thanks a lot for your help guys

Alessandro


I think there were two fatms drivers. fatms, and fatmsOem (or something like that). Also, i think you should handle the ioctl and devctl of the original drivers...
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alexp



Joined: 17 Apr 2007
Posts: 39
PostPosted: Thu Jul 12, 2007 5:18 am    Post subject: Reply with quote
kururin wrote:

I think there were two fatms drivers. fatms, and fatmsOem (or something like that). Also, i think you should handle the ioctl and devctl of the original drivers...


I'm not writing a new fatms driver, I'm just doing something like this in my plugin:

sceIoUnassign("msoem0:");
sceIoAssign("msoem0:","pspfs0:",NULL,0, IOASSIGN_RDWR , 0);
sceIoUnassign("ms0:");
sceIoAssign("ms0:","pspfs0:",NULL,0, IOASSIGN_RDWR , 0);
sceIoUnassign("fatms0:");

Strangely enough if i do
sceIoAssign("fatms0:","pspfs0:",NULL,0, IOASSIGN_RDWR , 0);
the memory stick disappear from the xmb menu, anyone knows why?

Alessandro
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alexp



Joined: 17 Apr 2007
Posts: 39
PostPosted: Thu Jul 12, 2007 9:35 am    Post subject: Reply with quote
I'm facing other strange behaviours, i hope someone can explain them to me

i have a DCIM directory in the root of my filesystem, it contains
.
..
101MSDCF <- directory

if i select the MC from the PHOTO menu in XMB, after a dopen & dread call to my filestem i get a call to getstat for /PSP/GAME/101MSDCF%/EBOOT.PBP, is there any reason for that? and most important, then i don't get any more calls, while i was expecting a call to dread for listing the file inside 101MSDCF

Any ideas will be really appreciated, the project is now going fairly well, it's possible from linux to create a directory tree and files around it
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alexp



Joined: 17 Apr 2007
Posts: 39
PostPosted: Thu Jul 19, 2007 11:48 pm    Post subject: Reply with quote
hi,
in the end i was successfull in my file system writing attempt, and during the development i found out the meaning of some new devctl and ioctl codes, I want to release the code, so i was wondering what kind of license i can use,
pspsdk is BSD license, i'd like to release my code under GPL2/3 is that possible?
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jimparis



Joined: 10 Jun 2005
Posts: 1179
Location: Boston
PostPosted: Fri Jul 20, 2007 12:39 am    Post subject: Reply with quote
Yes
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alexp



Joined: 17 Apr 2007
Posts: 39
PostPosted: Fri Jul 20, 2007 2:55 am    Post subject: Reply with quote
is it possible to publish it on ps2dev svn server or should i find some other storage solution?
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alexp



Joined: 17 Apr 2007
Posts: 39
PostPosted: Fri Jul 20, 2007 5:28 am    Post subject: Reply with quote
Here it is my really_not_yet_ready filesystem code, i hope it can be useful to anyone

http://allievi.sssup.it/tatiana/pspfs-0.1.tar.bz2
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hlide



Joined: 10 Sep 2006
Posts: 750
PostPosted: Fri Jul 20, 2007 8:24 am    Post subject: Reply with quote
this link doesn't work at all
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Wally



Joined: 26 Sep 2005
Posts: 672
PostPosted: Fri Jul 20, 2007 9:10 am    Post subject: Reply with quote
hlide wrote:
this link doesn't work at all


Try now
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