[PATCH v3 2/4] ceph: add subvolume quarantine wire definitions

[Alex Markuze <amarkuze@redhat.com>]

The MDS revokes a quarantined subvolume's caps to PIN and reports
-CEPH_EQUARANTINED in MClientCaps v14. This wire errno is 1000 and
must be translated to EACCES before returning it to applications.
When quarantine is lifted, MQuarantineDisable identifies the inode
whose local mark can be cleared.

Add the errno, message type and packed disable payload, and teach
ceph_msg_type_name() the message name. Advertise the session feature
only after the client can enforce quarantine on cached access.

Signed-off-by: Alex Markuze <amarkuze@redhat.com>
---
 include/linux/ceph/ceph_fs.h | 13 +++++++++++++
 net/ceph/ceph_common.c       |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h
index d70bbce1a1b2..5afccfa891cb 100644
--- a/include/linux/ceph/ceph_fs.h
+++ b/include/linux/ceph/ceph_fs.h
@@ -154,6 +154,7 @@ const char *ceph_con_mode_name(int mode);
 #define CEPH_MSG_CLIENT_SNAP            0x312
 #define CEPH_MSG_CLIENT_CAPRELEASE      0x313
 #define CEPH_MSG_CLIENT_QUOTA           0x314
+#define CEPH_MSG_CLIENT_QUARANTINE_DISABLE 0x315
 
 /* pool ops */
 #define CEPH_MSG_POOLOP_REPLY           48
@@ -921,4 +922,16 @@ struct ceph_mds_quota {
 	__le64 max_files;	/* quota max. files */
 } __attribute__ ((packed));
 
+/*
+ * Cap oserrno used by the MDS when a subvolume is quarantined.
+ * This is not a VFS errno; applications see -EACCES.
+ */
+#define CEPH_EQUARANTINED	1000
+
+/* MDS -> client: quarantine lifted for one inode (ino, oserrno). */
+struct ceph_mds_quarantine_disable {
+	__le64 ino;
+	__le32 oserrno;
+} __packed;
+
 #endif
diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index 67e88f30409d..cc3d21fd7d5b 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -83,6 +83,8 @@ const char *ceph_msg_type_name(int type)
 	case CEPH_MSG_CLIENT_CAPS: return "client_caps";
 	case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
 	case CEPH_MSG_CLIENT_QUOTA: return "client_quota";
+	case CEPH_MSG_CLIENT_QUARANTINE_DISABLE:
+		return "client_quarantine_disable";
 	case CEPH_MSG_CLIENT_SNAP: return "client_snap";
 	case CEPH_MSG_CLIENT_LEASE: return "client_lease";
 	case CEPH_MSG_POOLOP_REPLY: return "poolop_reply";
-- 
2.34.1