From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Simmons Date: Thu, 27 Feb 2020 16:18:08 -0500 Subject: [lustre-devel] [PATCH 620/622] lustre: handle: discard h_lock. In-Reply-To: <1582838290-17243-1-git-send-email-jsimmons@infradead.org> References: <1582838290-17243-1-git-send-email-jsimmons@infradead.org> Message-ID: <1582838290-17243-621-git-send-email-jsimmons@infradead.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lustre-devel@lists.lustre.org From: NeilBrown The h_lock spinlock is now only taken while bucket->lock is held. As a handle is associated with precisely one bucket, this means that h_lock can never be contended, so it isn't needed. So discard h_lock. Also discard an increasingly irrelevant comment in the declaration of struct portals_handle. WC-bug-id: https://jira.whamcloud.com/browse/LU-12542 Lustre-commit: 6acafe7ac4ef ("LU-12542 handle: discard h_lock.") Signed-off-by: NeilBrown Reviewed-on: https://review.whamcloud.com/35863 Reviewed-by: Neil Brown Reviewed-by: Shaun Tancheff Reviewed-by: Oleg Drokin Signed-off-by: James Simmons --- fs/lustre/include/lustre_handles.h | 3 --- fs/lustre/obdclass/lustre_handles.c | 7 ------- 2 files changed, 10 deletions(-) diff --git a/fs/lustre/include/lustre_handles.h b/fs/lustre/include/lustre_handles.h index afdade7..9dbe7c9 100644 --- a/fs/lustre/include/lustre_handles.h +++ b/fs/lustre/include/lustre_handles.h @@ -62,10 +62,7 @@ struct portals_handle { u64 h_cookie; const char *h_owner; refcount_t h_ref; - - /* newly added fields to handle the RCU issue. -jxiong */ struct rcu_head h_rcu; - spinlock_t h_lock; }; /* handles.c */ diff --git a/fs/lustre/obdclass/lustre_handles.c b/fs/lustre/obdclass/lustre_handles.c index 0048036..7ecd15ad3 100644 --- a/fs/lustre/obdclass/lustre_handles.c +++ b/fs/lustre/obdclass/lustre_handles.c @@ -85,7 +85,6 @@ void class_handle_hash(struct portals_handle *h, const char *owner) spin_unlock(&handle_base_lock); h->h_owner = owner; - spin_lock_init(&h->h_lock); bucket = &handle_hash[h->h_cookie & HANDLE_HASH_MASK]; spin_lock(&bucket->lock); @@ -108,13 +107,7 @@ static void class_handle_unhash_nolock(struct portals_handle *h) CDEBUG(D_INFO, "removing object %p with handle %#llx from hash\n", h, h->h_cookie); - spin_lock(&h->h_lock); - if (hlist_unhashed(&h->h_link)) { - spin_unlock(&h->h_lock); - return; - } hlist_del_init_rcu(&h->h_link); - spin_unlock(&h->h_lock); } void class_handle_unhash(struct portals_handle *h) -- 1.8.3.1