From a6369741c48815fedfce7072b7a9cd98b5bafd56 Mon Sep 17 00:00:00 2001 From: Sage Weil Date: Mon, 22 Feb 2010 13:59:00 -0800 Subject: [PATCH] ceph: fix comments, locking in destroy_inode The destroy_inode path needs no inode locks since there are no inode references. Update __ceph_remove_cap comment to reflect that it is called without cap->session->s_mutex in this case. Signed-off-by: Sage Weil --- fs/ceph/caps.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 289f6c65a17e..b6154ffe70df 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -856,8 +856,8 @@ static int __ceph_is_any_caps(struct ceph_inode_info *ci) } /* - * caller should hold i_lock, and session s_mutex. - * returns true if this is the last cap. if so, caller should iput. + * caller should hold i_lock. + * caller will not hold session s_mutex if called from destroy_inode. */ void __ceph_remove_cap(struct ceph_cap *cap) { @@ -974,15 +974,14 @@ static int send_cap_msg(struct ceph_mds_session *session, } /* - * Queue cap releases when an inode is dropped from our - * cache. + * Queue cap releases when an inode is dropped from our cache. Since + * inode is about to be destroyed, there is no need for i_lock. */ void ceph_queue_caps_release(struct inode *inode) { struct ceph_inode_info *ci = ceph_inode(inode); struct rb_node *p; - spin_lock(&inode->i_lock); p = rb_first(&ci->i_caps); while (p) { struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node); @@ -1024,9 +1023,7 @@ void ceph_queue_caps_release(struct inode *inode) spin_unlock(&session->s_cap_lock); p = rb_next(p); __ceph_remove_cap(cap); - } - spin_unlock(&inode->i_lock); } /* -- GitLab