Merge tag 'ceph-for-5.8-rc1' of git://github.com/ceph/ceph-client

Pull ceph updates from Ilya Dryomov:
 "The highlights are:

   - OSD/MDS latency and caps cache metrics infrastructure for the
     filesytem (Xiubo Li). Currently available through debugfs and will
     be periodically sent to the MDS in the future.

   - support for replica reads (balanced and localized reads) for rbd
     and the filesystem (myself). The default remains to always read
     from primary, users can opt-in with the new crush_location and
     read_from_replica options. Note that reading from replica is safe
     for general use only since Octopus.

   - support for RADOS allocation hint flags (myself). Currently used by
     rbd to propagate the compressible/incompressible hint given with
     the new compression_hint map option and ready for passing on more
     advanced hints, e.g. based on fadvise() from the filesystem.

   - support for efficient cross-quota-realm renames (Luis Henriques)

   - assorted cap handling improvements and cleanups, particularly
     untangling some of the locking (Jeff Layton)"

* tag 'ceph-for-5.8-rc1' of git://github.com/ceph/ceph-client: (29 commits)
  rbd: compression_hint option
  libceph: support for alloc hint flags
  libceph: read_from_replica option
  libceph: support for balanced and localized reads
  libceph: crush_location infrastructure
  libceph: decode CRUSH device/bucket types and names
  libceph: add non-asserting rbtree insertion helper
  ceph: skip checking caps when session reconnecting and releasing reqs
  ceph: make sure mdsc->mutex is nested in s->s_mutex to fix dead lock
  ceph: don't return -ESTALE if there's still an open file
  libceph, rbd: replace zero-length array with flexible-array
  ceph: allow rename operation under different quota realms
  ceph: normalize 'delta' parameter usage in check_quota_exceeded
  ceph: ceph_kick_flushing_caps needs the s_mutex
  ceph: request expedited service on session's last cap flush
  ceph: convert mdsc->cap_dirty to a per-session list
  ceph: reset i_requested_max_size if file write is not wanted
  ceph: throw a warning if we destroy session with mutex still locked
  ceph: fix potential race in ceph_check_caps
  ceph: document what protects i_dirty_item and i_flushing_item
  ...

1 files changed, 13 insertions, 1 deletions

diff --git a/include/linux/crush/crush.h b/include/linux/crush/crush.h
index 54741295c70b..33c16f2de7f6 100644
--- a/include/linux/crush/crush.h
+++ b/include/linux/crush/crush.h
@@ -87,7 +87,7 @@ struct crush_rule_mask {
 struct crush_rule {
 	__u32 len;
 	struct crush_rule_mask mask;
-	struct crush_rule_step steps[0];
+	struct crush_rule_step steps[];
 };
 
 #define crush_rule_size(len) (sizeof(struct crush_rule) + \
@@ -301,6 +301,12 @@ struct crush_map {
 
 	__u32 *choose_tries;
 #else
+	/* device/bucket type id -> type name (CrushWrapper::type_map) */
+	struct rb_root type_names;
+
+	/* device/bucket id -> name (CrushWrapper::name_map) */
+	struct rb_root names;
+
 	/* CrushWrapper::choose_args */
 	struct rb_root choose_args;
 #endif
@@ -342,4 +348,10 @@ struct crush_work {
 	struct crush_work_bucket **work; /* Per-bucket working store */
 };
 
+#ifdef __KERNEL__
+/* osdmap.c */
+void clear_crush_names(struct rb_root *root);
+void clear_choose_args(struct crush_map *c);
+#endif
+
 #endif