[PATCH] FAT: Support synchronous updates

[OGAWA Hirofumi]

[It seems that my first e-mail was lost, so this is re-post. If you
received duplicated email, sorry.]

Hi,

These patches adds the `-o sync' and `-o dirsync' supports to fatfs.
If user specified that option, the fatfs does traditional ordered
updates by using synchronous writes.  If compared to before, these
patches will show a improvement of robustness I think.

`-o sync'    - writes all buffers out before returning from syscall.
`-o dirsync' - writes the directory's metadata, and unreferencing
               operations of data block.

    remaining to be done
         fat_generic_ioctl(), fat_notify_change(),
	 ATTR_ARCH of fat_xxx_write[v],
	 and probably, filling hole in cont_prepare_write(),

NOTE: Since fatfs doesn't have link-count, unfortunately ->rename() is
not safe order at all.  It may make the shared blocks, but user
shouldn't lose the data by ->rename().

Please apply.
-- 
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
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