[PATCH v7 5/7] fuse: Simplfiy the posix acl handling logic.
Eric W. Biederman
ebiederm at xmission.com
Fri Mar 2 21:49:56 UTC 2018
Miklos Szeredi <mszeredi at redhat.com> writes:
> On Tue, Feb 27, 2018 at 12:53 AM, Eric W. Biederman
> <ebiederm at xmission.com> wrote:
>> Rename the fuse connection flag posix_acl to cached_posix_acl as that
>> is what it actually means. That fuse will cache and operate on the
>> cached value of the posix acl.
>> When fc->cached_posix_acl is not set, set ACL_DONT_CACHE on the inode
>> so that get_acl and friends won't cache the acl values even if they
>> are called.
>> Replace forget_all_cached_acls with fuse_forget_cached_acls. This
>> wrapper only takes effect when cached_posix_acl is true to prevent
>> losing the nocache or noxattr status in when posix acls are not
> Shouldn't forget_cached_acl() be taught about ACL_DONT_CACHE? I think
> it makes sense to generally not clear ACL_DONT_CACHE, since it's not
> an actual acl value that needs forgetting.
After stopping to make certain I understand the issues, I don't think
it makes sense to teach forget_cached_acl about ACL_DONT_CACHE.
If you are fogetting a cached attribute ACL_DONT_CACHE simply doesn't
Further it makes sense to cache a negative result for fuse when
!fc->no_getxattr. Even if you would ordinarily not cache posix acls.
So I think the better plan is to teach the posix acl code how to not
cache results on a case by case basis. As I did in my rfc patch I
posted a little earlier today. That works with forget_cached_acl and it
supports local reasoning. Further while the performance might not be as
good as ACL_DONT_CACHE I don't think that matters as always going to the
fuse server to get acls is almost certainly going to dominate the acl
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