diff options
| author | Jeff Layton <jlayton@kernel.org> | 2020-04-03 19:09:07 +0200 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2020-06-01 13:22:53 +0200 |
| commit | 829ad4db952aac86d11a62647d2516ab46c2fcd2 (patch) | |
| tree | 3ff8e570a00668a6e17a0f27d3b5ced8a4dd4089 /fs | |
| parent | ceph: request expedited service on session's last cap flush (diff) | |
| download | linux-829ad4db952aac86d11a62647d2516ab46c2fcd2.tar.xz linux-829ad4db952aac86d11a62647d2516ab46c2fcd2.zip | |
ceph: ceph_kick_flushing_caps needs the s_mutex
The mdsc->cap_dirty_lock is not held while walking the list in
ceph_kick_flushing_caps, which is not safe.
ceph_early_kick_flushing_caps does something similar, but the
s_mutex is held while it's called and I think that guards against
changes to the list.
Ensure we hold the s_mutex when calling ceph_kick_flushing_caps,
and add some clarifying comments.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ceph/caps.c | 2 | ||||
| -rw-r--r-- | fs/ceph/mds_client.c | 2 | ||||
| -rw-r--r-- | fs/ceph/mds_client.h | 4 | ||||
| -rw-r--r-- | fs/ceph/super.h | 7 |
4 files changed, 12 insertions, 3 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 2558fd14126a..41eb999dadf0 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -2518,6 +2518,8 @@ void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, struct ceph_cap *cap; u64 oldest_flush_tid; + lockdep_assert_held(&session->s_mutex); + dout("kick_flushing_caps mds%d\n", session->s_mds); spin_lock(&mdsc->cap_dirty_lock); diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 588221b9b3d0..6c283c52d401 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -4024,7 +4024,9 @@ static void check_new_map(struct ceph_mds_client *mdsc, oldstate != CEPH_MDS_STATE_STARTING) pr_info("mds%d recovery completed\n", s->s_mds); kick_requests(mdsc, i); + mutex_lock(&s->s_mutex); ceph_kick_flushing_caps(mdsc, s); + mutex_unlock(&s->s_mutex); wake_up_session_caps(s, RECONNECT); } } diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index 788182adcc51..43111e408fa2 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -199,8 +199,10 @@ struct ceph_mds_session { struct list_head s_cap_releases; /* waiting cap_release messages */ struct work_struct s_cap_release_work; - /* both protected by s_mdsc->cap_dirty_lock */ + /* See ceph_inode_info->i_dirty_item. */ struct list_head s_cap_dirty; /* inodes w/ dirty caps */ + + /* See ceph_inode_info->i_flushing_item. */ struct list_head s_cap_flushing; /* inodes w/ flushing caps */ unsigned long s_renew_requested; /* last time we sent a renew req */ diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 3a95395a4217..b82f82d8213a 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -362,8 +362,11 @@ struct ceph_inode_info { struct list_head i_dirty_item; /* - * Link to session's s_cap_flushing list. Protected by - * mdsc->cap_dirty_lock. + * Link to session's s_cap_flushing list. Protected in a similar + * fashion to i_dirty_item, but also by the s_mutex for changes. The + * s_cap_flushing list can be walked while holding either the s_mutex + * or msdc->cap_dirty_lock. List presence can also be checked while + * holding the i_ceph_lock for this inode. */ struct list_head i_flushing_item; |