[NFS-Ganesha-Devel] Change in ffilz/nfs-ganesha[next]: rados_recov: convert rados_recov_oid to be RCU-managed gsh_refstr

Jeff Layton has uploaded this change for review. ( https://review.gerrithub.io/432326 Change subject: rados_recov: convert rados_recov_oid to be RCU-managed gsh_refstr ...................................................................... rados_recov: convert rados_recov_oid to be RCU-managed gsh_refstr In the big scheme of things, the rados_recov_oid changes very infrequently, and only in response to a different server requesting a grace period. Change the rados_recov_oid to be managed with an atomic refcount and RCU. The general pattern is to take the rcu_read_lock and atomically bump the refcount and then release it. Once we are finished with the string we drop the refcount. When we need to change the string, we swap the old object with the new with an xchg operation, and then call synchronize_rcu to wait for any users of the old pointer to complete. This allows us to fetch and update the thing locklessly but safely. Change-Id: I6df9ce3f0f562b8d760d4c02311528bbe635d17b Signed-off-by: Jeff Layton <jlayton(a)redhat.com&gt; --- M src/SAL/recovery/recovery_rados.h M src/SAL/recovery/recovery_rados_cluster.c M src/SAL/recovery/recovery_rados_kv.c M src/SAL/recovery/recovery_rados_ng.c 4 files changed, 126 insertions(+), 31 deletions(-) git pull ssh://review.gerrithub.io:29418/ffilz/nfs-ganesha refs/changes/26/432326/1 -- To view, visit https://review.gerrithub.io/432326 To unsubscribe, or for help writing mail filters, visit https://review.gerrithub.io/settings Gerrit-Project: ffilz/nfs-ganesha Gerrit-Branch: next Gerrit-MessageType: newchange Gerrit-Change-Id: I6df9ce3f0f562b8d760d4c02311528bbe635d17b Gerrit-Change-Number: 432326 Gerrit-PatchSet: 1 Gerrit-Owner: Jeff Layton <jlayton(a)redhat.com&gt;