What are Access Control Lists? How do I enable Access Control Lists on PVFS?
Recent versions of PVFS support POSIX Access Control Lists (ACL), which are used to define fine-grained discretionary access rights for files and directories. Every object can be thought of as having associated with it an ACL that governs the discretionary access to that object; this ACL is referred to as an access ACL. In addition, a directory may have an associated ACL that governs the initial access ACL for objects created within that directory; this ACL is referred to as a default ACL. Each ACL consists of a set of ACL entries. An ACL entry specifies the access permissions on the associated object for an individual user or a group of users as a combination of read, write and search/execute permissions. PVFS supports POSIX ACLs by storing them as extended attributes. However, support for access control based permission checking does not exist on 2.4 Linux kernels and is hence disabled on them. Most recent version of the Linux 2.6 kernels do allow for such permission checks, and PVFS
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