diff options
| author |   Jeff Layton <jlayton@kernel.org> | 2019-11-20 12:00:59 -0500 |
|---|---|---|
| committer |   Ilya Dryomov <idryomov@gmail.com> | 2019-12-09 20:55:10 +0100 |
| commit | 3a3430affce5de301fc8e6e50fa3543d7597820e (patch) | |
| tree | bdabd16c0708b46096b4301e5a7a206311adb396 /fs/ceph/caps.c | |
| parent | ceph: convert int fields in ceph_mount_options to unsigned int (diff) | |
| download | wireguard-linux-3a3430affce5de301fc8e6e50fa3543d7597820e.tar.xz wireguard-linux-3a3430affce5de301fc8e6e50fa3543d7597820e.zip | |
ceph: show tasks waiting on caps in debugfs caps file
Add some visibility of tasks that are waiting for caps to the "caps"
debugfs file. Display the tgid of the waiting task, inode number, and
the caps the task needs and wants.
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/ceph/caps.c')
| -rw-r--r-- | fs/ceph/caps.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index f5a38910a82b..271d8283d263 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -2764,7 +2764,19 @@ int ceph_get_caps(struct file *filp, int need, int want, if (ret == -EAGAIN) continue; if (!ret) { + struct ceph_mds_client *mdsc = fsc->mdsc; + struct cap_wait cw; DEFINE_WAIT_FUNC(wait, woken_wake_function); + + cw.ino = inode->i_ino; + cw.tgid = current->tgid; + cw.need = need; + cw.want = want; + + spin_lock(&mdsc->caps_list_lock); + list_add(&cw.list, &mdsc->cap_wait_list); + spin_unlock(&mdsc->caps_list_lock); + add_wait_queue(&ci->i_cap_wq, &wait); flags |= NON_BLOCKING; @@ -2778,6 +2790,11 @@ int ceph_get_caps(struct file *filp, int need, int want, } remove_wait_queue(&ci->i_cap_wq, &wait); + + spin_lock(&mdsc->caps_list_lock); + list_del(&cw.list); + spin_unlock(&mdsc->caps_list_lock); + if (ret == -EAGAIN) continue; } |