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Re: Case insensitive FFS

On Wed, Aug 06, 2008 at 09:24:43AM -0400, Greg Troxel wrote:
>   >   My naive idea is that changing ufs_lookup() and the hash functions
>   >   in the UFS_DIRHASH case to treat upper case letters like lower case
>   >   letter (or vice versa).
>   > 
>   > That sounds like case preserving.  If all vnode ops lowercased on entry
>   > (plus the above to handle 'legacy' files) then it would be case
>   > insensitive.
>   I'm sorry but I don't understand your argumentation. FFS is already
>   case preserving. I want to make it case insensitive in addition.
> I have seen three terms used:
>   case sensitive: what we are used to with BSD FFS, HFS+ with the case
>   sensitive option
>   case preserving: comparisons are done without regard to case, but ls
>   shows files having the same case as when they were created.  HFS+
>   (without the case-sensitive option)
>   case insensitive: in addition to comparisons ignoring case, all
>   filenames are presented in either upper or lower, depending on the
>   system.  I think pre-NTFS on windows is like this.

I've heard the latter refered to as case non-preserving, and both 
"preserving" variants as qualifiers on case insensitive.

Take care,


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