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authorYan, Zheng <zyan@redhat.com>2019-05-23 11:01:37 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-08-04 09:29:40 +0200
commitdc23897f1aff16f7e3c23b60f4e2b3db8a6c9474 (patch)
tree41fd9300433e952cee8fc0aba4b33ced0c5b1c59
parentdb8664152f09bd692b0b505434133205656a4fb0 (diff)
ceph: hold i_ceph_lock when removing caps for freeing inode
commit d6e47819721ae2d9d090058ad5570a66f3c42e39 upstream. ceph_d_revalidate(, LOOKUP_RCU) may call __ceph_caps_issued_mask() on a freeing inode. Signed-off-by: "Yan, Zheng" <zyan@redhat.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/ceph/caps.c10
-rw-r--r--fs/ceph/inode.c2
-rw-r--r--fs/ceph/super.h2
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 5b7d4881a4f8..3c7a32779574 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -536,7 +536,7 @@ void ceph_evict_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 048409fba1a8..edec39aa5ce2 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1000,7 +1000,7 @@ 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);