SMB3 POSIX and deleting files with FILE_ATTRIBUTE_READONLY

[Ralph Boehme]

Hi folks,

what should be the behavior with SMB3 POSIX when a POSIX client tries to 
delete a file that has FILE_ATTRIBUTE_READONLY set?

The major question that we must answer is, if this we would want to 
allow for POSIX clients to ignore this in some way: either completely 
ignore it on POSIX handles or first check if the handle has requested 
and been granted WRITE_ATTRIBUTES access.

Checking WRITE_ATTRIBUTES first means we would correctly honor 
permissions and the client could have removed FILE_ATTRIBUTE_READONLY 
anyway to then remove the file.

Windows has some new bits FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE to 
handle this locally (!) and it seems to be doing it without checking 
WRITE_ATTRIBUTES on the server.

<https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-fscc/2e860264-018a-47b3-8555-565a13b35a45>

Thoughts?

Thanks!
-slow
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