[Gluster-devel] Problems about cache virtual glusterfs ACLs for ganesha in md-cache

Jiffin Tony Thottan jthottan at redhat.com
Thu Oct 11 04:10:41 UTC 2018

On Thursday 11 October 2018 08:10 AM, Raghavendra Gowdappa wrote:
> On Thu, Oct 11, 2018 at 7:47 AM Kinglong Mee <kinglongmee at gmail.com 
> <mailto:kinglongmee at gmail.com>> wrote:
>     Cc nfs-ganesha,
>     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.
> Not sure how virtual xattrs are consumed or who generates them. 
> +Raghavendra Talur <mailto:rtalur at redhat.com> +Thottan, Jiffin 
> <mailto:jthottan at redhat.com> - acl maintainers.

The currently only consumers of this virtual xattr is nfs-ganesha. Nfsv4 
acls were sent from client and ganesha converts to posix acl

and sent as virtual xattr to glusterfs bricks using 
pub_glfs_h_acl_set/get api's. AFAIR  in samba vfs module they convert 
windows acl to

posix acl and sent as actual getxattr/setxattr calls on "system.posixl-acl"



>     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.
>     Any comments are welcome.
>     thanks,
>     Kinglong Mee
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