(Fwd) Re: DOSFS bug fixes, IDE drivers and sample released

Joel Sherrill joel.sherrill at OARcorp.com
Wed Apr 16 11:38:14 UTC 2003

Chris Caudle wrote:

>>I have found that listing the directory after closing the file 
>>seems to do the trick. It must purge the buffers to the disk.
>I haven't looked at the DOSFS code yet, does it have a sync() or fsync() function?
>If the file system keeps the allocation table cached in memory, you may need to flush the allocation table to the storage device, especially if you are shutting down power on the RTEMS system and moving the storage device to a different machine (or just re-booting into Windows, Linux, MacOS etc. on the same machine).
Or at least a flush() on the file itself? 

Not to get me started on a tangent but my disertation included some 
thought on the idea
that different embedded systems needed different disk caching and 
scheduling algorithms.
Ideally those should be selectable on a per-file basis but at a 
partition level would be
acceptable.  For example, a write-only log file should have data kept 
only long enough to
get it to disk but a sequentially read file could use read-ahead and 
discard as soon as
the application read the data.  With some (intelligent) hints from the 
the algorithms could be better selected. 

>-- Chris Caudle

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