Hi,
I've been working on an improved bart(1M) that is supposed to address
open issues including XATTR support. In writing the XATTR support the
only MT appropriate solution I've found that doesn't make bad privilege
assumptions for performing a stat depends on openat() to get the
parent's attribute directory and fstatat() to get the stat. There is
however no corresponding way to request a file's acls.
With the current interfaces, I must either have the file open or be
able to reference to it by path. But this creates a choice between
having the file open to get acls despite read permission explicitly not
being a requirement for reading a file's acls or performing a chdir()
which impacts the entire process.
It looks like fstatat() was a recognized need of XATTR support as it
was included in "PSARC/1999/209 Extended File Attributes" but a
corresponding "faclat()" was not added and "2002/240 ZFS" added
(f)acl_get() but did not add a corresponding facl_getat().
-Will
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