ceph: dump granular cap info in "caps" debugfs file

We have a "caps" file already that gives statistics on the caps
cache as a whole. Add another section to that output and dump a
line for each individual cap record.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c
index 98365e74cb4aa12cb5b80daa18f4e83956798f27..777f6ceb5259296ef08aa780b7f5dc208157ea47 100644 (file)
--- a/fs/ceph/debugfs.c
+++ b/fs/ceph/debugfs.c
@@ -124,18 +124,48 @@ static int mdsc_show(struct seq_file *s, void *p)
        return 0;
 }
 
+static int caps_show_cb(struct inode *inode, struct ceph_cap *cap, void *p)
+{
+       struct seq_file *s = p;
+
+       seq_printf(s, "0x%-17lx%-17s%-17s\n", inode->i_ino,
+                  ceph_cap_string(cap->issued),
+                  ceph_cap_string(cap->implemented));
+       return 0;
+}
+
 static int caps_show(struct seq_file *s, void *p)
 {
        struct ceph_fs_client *fsc = s->private;
-       int total, avail, used, reserved, min;
+       struct ceph_mds_client *mdsc = fsc->mdsc;
+       int total, avail, used, reserved, min, i;
 
        ceph_reservation_status(fsc, &total, &avail, &used, &reserved, &min);
        seq_printf(s, "total\t\t%d\n"
                   "avail\t\t%d\n"
                   "used\t\t%d\n"
                   "reserved\t%d\n"
-                  "min\t%d\n",
+                  "min\t\t%d\n\n",
                   total, avail, used, reserved, min);
+       seq_printf(s, "ino                issued           implemented\n");
+       seq_printf(s, "-----------------------------------------------\n");
+
+       mutex_lock(&mdsc->mutex);
+       for (i = 0; i < mdsc->max_sessions; i++) {
+               struct ceph_mds_session *session;
+
+               session = __ceph_lookup_mds_session(mdsc, i);
+               if (!session)
+                       continue;
+               mutex_unlock(&mdsc->mutex);
+               mutex_lock(&session->s_mutex);
+               ceph_iterate_session_caps(session, caps_show_cb, s);
+               mutex_unlock(&session->s_mutex);
+               ceph_put_mds_session(session);
+               mutex_lock(&mdsc->mutex);
+       }
+       mutex_unlock(&mdsc->mutex);
+
        return 0;
 }