On Aug 2 16:50, Shaddy Baddah wrote:
> Hi,
>
> As per:
>
> http://cygwin.com/cygwin-ug-net/using-specialnames.html#pathnames-casesensitive
>
> Cygwin act on filenames on NTFS in with case preservation/sensitivity.
Correction, not only NTFS. Here's the source code comment:
/* Case sensitivity is supported if FILE_CASE_SENSITIVE_SEARCH is set,
except on Samba which handles Windows clients case insensitive.
NFS doesn't set the FILE_CASE_SENSITIVE_SEARCH flag but is case
sensitive.
UDF on NT 5.x is broken (at least) in terms of case sensitivity.
The UDF driver reports the FILE_CASE_SENSITIVE_SEARCH capability
but:
- Opening the root directory for query seems to work at first,
but the filenames in the directory listing are mutilated.
- When trying to open a file or directory case sensitive, the file
appears to be non-existant. */
> As this was a feature configured in the Windows kernel, the pre-existing
> limitation whereby the same case sensitivity was not available for FAT32
> was an understandable compromise.
>
> Unfortunately, in providing EXFAT, Microsoft has not seen fit to carry
> over the same handling in the kernel as it does in NTFS.
ExFAT is based on FAT/FAT32, so it's understandable. I don't have ExFAT
available. Assuming your ExFAT drive is drive X:, can you please show
me the output of
/usr/lib/csih/getVolInfo.exe /cygdrive/x
If it returns different values than FAT, it might be worth to handle
specificially in Cygwin's mount code.
> Can I suggest that if it is a) feasible b) doable without too much added
> degradation in performance/complexity to the file handling code, that
> Cygwin add some limited support itself.
>
> I'm not talking about going back to something like the old managed
> mounts, but more to its replacement function. That being the same
> handling of special characters like :, |, etc that Cygwin employs.
>
> That is, the use of the special Unicode breakout character. It can
> be used when a name collision is detected (yes, detection code required.
> I don't know how costly that would be). eg.
> [...]
> Is the trade-off large enough to fall back on the "just use NTFS"
> argument?
Well, from my POV, yes. It doesn't make sense to use ExFAT for serious
work anyway, it's for SD cards and stuff like that.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
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