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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