VFAT: flush mount option

VFAT: flush mount option

[luca ellero]

Hi all,
I've read somewhere that the suggested mount option for USB key with FAT 
filesystem is "-o flush" instead of "-o sync" (if you want to remove the 
key safely, without executing umount or sync). sync option is quite 
dangerous (and slow) for flash file-systems since it does an aggressive 
flushing on the FAT, which can damage the flash.
Anyway with flush option (kernel 2.6.32), I experienced the following:
- if I create or modify a file on the key, the fs is sync'ed immediately 
so I can pull out the key immediately with no side effects
- but if I only create a directory and anything else, the "flush" is not 
executed immediately, so if I pull out the key, the directory just 
created disappear (which is not what I would expect).
Can someone please tell me if this is the right behaviour or am I 
missing something.
Thanks
Best regards
Luca Ellero

VFAT: flush mount option

[Mulyadi Santosa]

On Thu, Apr 21, 2011 at 16:41, luca ellero <lroluk@gmail.com> wrote:
> - but if I only create a directory and anything else, the "flush" is not
> executed immediately, so if I pull out the key, the directory just
> created disappear (which is not what I would expect).

looks like that's the job of "dirsync"...

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com

VFAT: flush mount option

[luca ellero]

2011/4/21 Mulyadi Santosa <mulyadi.santosa@gmail.com>

> On Thu, Apr 21, 2011 at 16:41, luca ellero <lroluk@gmail.com> wrote:
> > - but if I only create a directory and anything else, the "flush" is not
> > executed immediately, so if I pull out the key, the directory just
> > created disappear (which is not what I would expect).
>
> looks like that's the job of "dirsync"...
>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
>

Thank you Mulyadi,
with your suggestion it works as expected.
Thanks again
regards
Luca
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VFAT: flush mount option

[Mulyadi Santosa]

On Mon, Apr 25, 2011 at 18:26, luca ellero <lroluk@gmail.com> wrote:
> Thank you Mulyadi,
> with your suggestion it works as expected.
> Thanks again

no problem... it's new stuff for me too..kinda guess work....glad it
solves your problem.


-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com