[Bugs] [Bug 1634220] md-cache: some problems of cache "glusterfs.posix.acl" for ganesha

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1634220



--- Comment #1 from Kinglong Mee <kinglongmee at gmail.com> ---
Md-cache has option "cache-posix-acl" that controls caching of posix ACLs
("system.posix_acl_access"/"system.posix_acl_default") and virtual glusterfs
ACLs ("glusterfs.posix.acl"/"glusterfs.posix.default_acl") now.

But, _posix_xattr_get_set does not fill virtual glusterfs ACLs when lookup
requests.
So, md-cache caches bad virtual glusterfs ACLs.

After I turn on "cache-posix-acl" option to cache ACLs at md-cache, nfs client
gets many EIO errors.

https://review.gerrithub.io/c/ffilz/nfs-ganesha/+/427305

There are two chooses for cache virtual glusterfs ACLs in md-cache,
1. Cache it separately as posix ACLs (a new option maybe "cache-glusterfs-acl"
is added);
   And make sure _posix_xattr_get_set fills them when lookup requests.

2. Does not cache it, only cache posix ACLs;
   If gfapi request it, md-cache lookup according posix ACL at cache,
   if exist, make the virtual glusterfs ACL locally and return to gfapi;
   otherwise, send the request to glusterfsd.

Virtual glusterfs ACLs are another format of posix ACLs, there are larger than
posix ACLs, 
and always exist no matter the really posix ACL exist or not.

So, I'd prefer #2.

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