* [CHECKER] Need help on mmap on FUSE (linux user-land file system)
@ 2005-03-13 7:20 Junfeng Yang
2005-03-13 7:28 ` [MC] " Junfeng Yang
0 siblings, 1 reply; 4+ messages in thread
From: Junfeng Yang @ 2005-03-13 7:20 UTC (permalink / raw)
To: Linux Kernel Mailing List, fuse-devel; +Cc: mc, Miklos Szeredi
Does anyone know how to set up mmap on FUSE (linux user-land file system)?
Or is it even possible to have mmap on FUSE?
Our file system checker can potentially check a lot more things if we can
have mmap working on a FUSE file system. Your help on this are well
appreciated!
-Junfeng
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [MC] [CHECKER] Need help on mmap on FUSE (linux user-land file system)
2005-03-13 7:20 [CHECKER] Need help on mmap on FUSE (linux user-land file system) Junfeng Yang
@ 2005-03-13 7:28 ` Junfeng Yang
2005-03-13 13:51 ` Kyle Moffett
0 siblings, 1 reply; 4+ messages in thread
From: Junfeng Yang @ 2005-03-13 7:28 UTC (permalink / raw)
To: Linux Kernel Mailing List, fuse-devel; +Cc: mc, Miklos Szeredi
Forget to mention, we are checking linux 2.6. It appears to us that mmap
doesnt' work for FUSE in linux 2.6.
-Junfeng
On Sat, 12 Mar 2005, Junfeng Yang wrote:
>
> Does anyone know how to set up mmap on FUSE (linux user-land file system)?
> Or is it even possible to have mmap on FUSE?
>
> Our file system checker can potentially check a lot more things if we can
> have mmap working on a FUSE file system. Your help on this are well
> appreciated!
>
> -Junfeng
>
>
> _______________________________________________
> MC mailing list
> MC@keeda.stanford.edu
> http://keeda.stanford.edu/cgi-bin/mailman/listinfo/mc
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [MC] [CHECKER] Need help on mmap on FUSE (linux user-land file system)
2005-03-13 7:28 ` [MC] " Junfeng Yang
@ 2005-03-13 13:51 ` Kyle Moffett
2005-03-14 10:22 ` Miklos Szeredi
0 siblings, 1 reply; 4+ messages in thread
From: Kyle Moffett @ 2005-03-13 13:51 UTC (permalink / raw)
To: Junfeng Yang; +Cc: Miklos Szeredi, Linux Kernel Mailing List, fuse-devel, mc
On Mar 13, 2005, at 02:28, Junfeng Yang wrote:
> Forget to mention, we are checking linux 2.6. It appears to us that
> mmap
> doesnt' work for FUSE in linux 2.6.
IIRC, the reason mmap doesn't work on FUSE is because when it dirties
pages they
cannot be flushed reliably, because writing them out involves calling a
userspace
process which may allocate RAM, etc.
Cheers,
Kyle Moffett
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [MC] [CHECKER] Need help on mmap on FUSE (linux user-land file system)
2005-03-13 13:51 ` Kyle Moffett
@ 2005-03-14 10:22 ` Miklos Szeredi
0 siblings, 0 replies; 4+ messages in thread
From: Miklos Szeredi @ 2005-03-14 10:22 UTC (permalink / raw)
To: mrmacman_g4; +Cc: yjf, linux-kernel, fuse-devel, mc
> > Forget to mention, we are checking linux 2.6. It appears to us
> > that mmap doesnt' work for FUSE in linux 2.6.
>
> IIRC, the reason mmap doesn't work on FUSE is because when it
> dirties pages they cannot be flushed reliably, because writing them
> out involves calling a userspace process which may allocate RAM,
> etc.
Yes. To be precise this only affects writable shared mmap(), which is
not used by the great majority of applications. Any other kind of
memory mapping should work OK.
Thanks,
Miklos
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-03-14 10:22 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2005-03-13 7:20 [CHECKER] Need help on mmap on FUSE (linux user-land file system) Junfeng Yang
2005-03-13 7:28 ` [MC] " Junfeng Yang
2005-03-13 13:51 ` Kyle Moffett
2005-03-14 10:22 ` Miklos Szeredi
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