Re: UTF-8 and case-insensitivity

[tridge]

Linus,

 > Why do you focus on linear directory scans?

Because a large number of file operations are on filenames that don't
exist. I have to *prove* they don't exist. That includes:

 * every file create. I have to prove there wasn't an existing file
   under a different case combination.

 * every rename. Again, I have to prove that the destination name
   doesn't exist.

 * every open of a non-existant name (*very* common, its what MS
   office does all the time).

 etc etc.

If I had a single function that could quickly tell me that a file does
not exist in any case combination then I would be much better off.

 > They simply do not happen under any reasonable IO patterns. You look up 
 > names under the same name that they are on the disk. So the _only_ thing 
 > that should matter is the exact match.

nope, see above. The most common pattern of accesses involves doing a
full directory scan on every access.

 > Sure, I can imaging that MS would make some benchmark to show that case, 
 > but at that point I just don't care. 

It's not just "some benchmark". It's the normal use case.

Cheers, Tridge
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