[PATCH v6 3/5] ceph: add subvolume quarantine wire definitions

[Alex Markuze]

The MDS reports -CEPH_EQUARANTINED in MClientCaps v14 when quarantine
denies a client's access, and restricts that client's caps to PIN. The
wire errno is 1000; the client must return EACCES to applications.
MQuarantineDisable identifies the inode whose quarantine mark can be
cleared when access is restored.

Define the errno, message type and packed disable payload, and add the
message name to ceph_msg_type_name(). The quarantine state and access
patches consume these definitions; support is advertised after the
cached-access checks are installed.

Signed-off-by: Alex Markuze <amarkuze@xxxxxxxxxx>
---
 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 d70bbce1a1b2b4ffffebe896ef46eb6853ab354b..5afccfa891cb045e9784eda1cc4741749aac4c06 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 67e88f30409dd3ffba9dadb6fda529f4101d830f..cc3d21fd7d5bf251bd58ce19f8c7d8a5b02fa1d7 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";