Re: [RFD] FAT robustness

[Denis Vlasenko]

On Tuesday 19 July 2005 19:58, Etienne Lorrain wrote:
> > I'd like to have a discussion about FAT robustness.
> > Please give your thought, comments and related issues.
> 
>   What I would like is to treat completely differently writing to
>  FAT (writing to a removeable drive) which need a complete "mount",
>  and just reading quickly a file (a standard use of removeable devices).
> 
>  Basically, to read you would not need to mount the partition, just
>  read /readfs/fd1 which uses two or three functions accessing /dev/fd1
>  in raw mode to read the filesystem descriptor and the root directory.
>  Same for /readfs/cdrom and /readfs/sda4 (USB drive).
>  The only cache would be the one provided by /dev/fd1 - a kind of
>  mount read-only at each file opening.
> 
>  This system would be disabled if the partition is already mounted
>  read/write somewhere - but as long as you do not try to write to
>  a removeable disk you can extract it at any time.
> 
>   The two or three function I am talking of are located in Gujin
>  "fs.c" file to access read-only FAT12/16/32, EXT2/3 and ISOFS
>  ( http://gujin.org ). Just few kilobytes - and some source
>  modifications for that use.

I think we will be better with more generic 'flush all dirty data
and mark superblock as clean asap' behaviour, aka 'weak O_SYNC',
so that we can remove e.g. USB removable almost anytime (can't safely
remove it _only while it is being written to_).
--
vda

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