landlock: Split struct landlock_domain from struct landlock_ruleset

Switch all domain users to the new struct landlock_domain type
introduced by a previous commit, eliminating the conflation between
mutable rulesets and immutable domains. landlock_merge_ruleset() now
returns and allocates a struct landlock_domain, and the merge and
inherit helpers move next to it; the former static insert_rule() is
exported as landlock_store_rule() for its new caller across the
translation-unit boundary.

The merge destination is now a private struct landlock_domain still
under construction (owned by the calling thread, not yet shared), so the
merge and inherit helpers lock only the source ruleset: the previous
lock of both destination and source collapses to a single
mutex_lock(&src->lock).

Rename the per-layer access-mask field from access_masks to
handled_masks, naming it by the role it plays (the rights each layer
handles) rather than by its type, paralleling the struct access_masks
quiet_masks field.  Drop the now domain-only fields (hierarchy,
work_free, num_layers) from struct landlock_ruleset.

The new struct landlock_domain field in cred.h pulls in domain.h, which
includes audit.h, which previously included cred.h, forming an include
cycle.  Break it by having audit.h forward-declare the struct
landlock_cred_security and struct landlock_hierarchy it uses instead of
including cred.h.

Cc: Günther Noack <gnoack@google.com>
Cc: Tingmao Wang <m@maowtm.org>
Link: https://patch.msgid.link/20260811094338.288094-4-mic@digikod.net
Signed-off-by: Mickaël Salaün <mic@digikod.net>

0 files changed, 0 insertions, 0 deletions