From d6e47819721ae2d9d090058ad5570a66f3c42e39 Mon Sep 17 00:00:00 2001 From: "Yan, Zheng" Date: Thu, 23 May 2019 11:01:37 +0800 Subject: [PATCH] ceph: hold i_ceph_lock when removing caps for freeing inode ceph_d_revalidate(, LOOKUP_RCU) may call __ceph_caps_issued_mask() on a freeing inode. Signed-off-by: "Yan, Zheng" Reviewed-by: Jeff Layton Signed-off-by: Ilya Dryomov --- fs/ceph/caps.c | 10 ++++++---- fs/ceph/inode.c | 2 +- fs/ceph/super.h | 2 +- 3 files changed, 8 insertions(+), 6 deletions(-) diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 0176241eaea7..7754d7679122 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -1263,20 +1263,22 @@ static int send_cap_msg(struct cap_msg_args *arg) } /* - * Queue cap releases when an inode is dropped from our cache. Since - * inode is about to be destroyed, there is no need for i_ceph_lock. + * Queue cap releases when an inode is dropped from our cache. */ -void __ceph_remove_caps(struct inode *inode) +void __ceph_remove_caps(struct ceph_inode_info *ci) { - struct ceph_inode_info *ci = ceph_inode(inode); struct rb_node *p; + /* lock i_ceph_lock, because ceph_d_revalidate(..., LOOKUP_RCU) + * may call __ceph_caps_issued_mask() on a freeing inode. */ + spin_lock(&ci->i_ceph_lock); p = rb_first(&ci->i_caps); while (p) { struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node); p = rb_next(p); __ceph_remove_cap(cap, true); } + spin_unlock(&ci->i_ceph_lock); } /* diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index aa631849a8d6..18869ba08db7 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -533,7 +533,7 @@ void ceph_destroy_inode(struct inode *inode) ceph_fscache_unregister_inode_cookie(ci); - __ceph_remove_caps(inode); + __ceph_remove_caps(ci); if (__ceph_has_any_quota(ci)) ceph_adjust_quota_realms_count(inode, false); diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 29ea4eba98fe..0176b3c97e1a 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -1004,7 +1004,7 @@ extern void ceph_add_cap(struct inode *inode, unsigned cap, unsigned seq, u64 realmino, int flags, struct ceph_cap **new_cap); extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); -extern void __ceph_remove_caps(struct inode* inode); +extern void __ceph_remove_caps(struct ceph_inode_info *ci); extern void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap); extern int ceph_is_any_caps(struct inode *inode); -- 2.39.5