ceph: factor out libceph from Ceph file system
This factors out protocol and low-level storage parts of ceph into a
separate libceph module living in net/ceph and include/linux/ceph. This
is mostly a matter of moving files around. However, a few key pieces
of the interface change as well:
- ceph_client becomes ceph_fs_client and ceph_client, where the latter
captures the mon and osd clients, and the fs_client gets the mds client
and file system specific pieces.
- Mount option parsing and debugfs setup is correspondingly broken into
two pieces.
- The mon client gets a generic handler callback for otherwise unknown
messages (mds map, in this case).
- The basic supported/required feature bits can be expanded (and are by
ceph_fs_client).
No functional change, aside from some subtle error handling cases that got
cleaned up in the refactoring process.
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/net/ceph/auth.c b/net/ceph/auth.c
new file mode 100644
index 0000000..549c1f4
--- /dev/null
+++ b/net/ceph/auth.c
@@ -0,0 +1,259 @@
+#include <linux/ceph/ceph_debug.h>
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+#include <linux/ceph/types.h>
+#include <linux/ceph/decode.h>
+#include <linux/ceph/libceph.h>
+#include <linux/ceph/messenger.h>
+#include "auth_none.h"
+#include "auth_x.h"
+
+
+/*
+ * get protocol handler
+ */
+static u32 supported_protocols[] = {
+ CEPH_AUTH_NONE,
+ CEPH_AUTH_CEPHX
+};
+
+static int ceph_auth_init_protocol(struct ceph_auth_client *ac, int protocol)
+{
+ switch (protocol) {
+ case CEPH_AUTH_NONE:
+ return ceph_auth_none_init(ac);
+ case CEPH_AUTH_CEPHX:
+ return ceph_x_init(ac);
+ default:
+ return -ENOENT;
+ }
+}
+
+/*
+ * setup, teardown.
+ */
+struct ceph_auth_client *ceph_auth_init(const char *name, const char *secret)
+{
+ struct ceph_auth_client *ac;
+ int ret;
+
+ dout("auth_init name '%s' secret '%s'\n", name, secret);
+
+ ret = -ENOMEM;
+ ac = kzalloc(sizeof(*ac), GFP_NOFS);
+ if (!ac)
+ goto out;
+
+ ac->negotiating = true;
+ if (name)
+ ac->name = name;
+ else
+ ac->name = CEPH_AUTH_NAME_DEFAULT;
+ dout("auth_init name %s secret %s\n", ac->name, secret);
+ ac->secret = secret;
+ return ac;
+
+out:
+ return ERR_PTR(ret);
+}
+
+void ceph_auth_destroy(struct ceph_auth_client *ac)
+{
+ dout("auth_destroy %p\n", ac);
+ if (ac->ops)
+ ac->ops->destroy(ac);
+ kfree(ac);
+}
+
+/*
+ * Reset occurs when reconnecting to the monitor.
+ */
+void ceph_auth_reset(struct ceph_auth_client *ac)
+{
+ dout("auth_reset %p\n", ac);
+ if (ac->ops && !ac->negotiating)
+ ac->ops->reset(ac);
+ ac->negotiating = true;
+}
+
+int ceph_entity_name_encode(const char *name, void **p, void *end)
+{
+ int len = strlen(name);
+
+ if (*p + 2*sizeof(u32) + len > end)
+ return -ERANGE;
+ ceph_encode_32(p, CEPH_ENTITY_TYPE_CLIENT);
+ ceph_encode_32(p, len);
+ ceph_encode_copy(p, name, len);
+ return 0;
+}
+
+/*
+ * Initiate protocol negotiation with monitor. Include entity name
+ * and list supported protocols.
+ */
+int ceph_auth_build_hello(struct ceph_auth_client *ac, void *buf, size_t len)
+{
+ struct ceph_mon_request_header *monhdr = buf;
+ void *p = monhdr + 1, *end = buf + len, *lenp;
+ int i, num;
+ int ret;
+
+ dout("auth_build_hello\n");
+ monhdr->have_version = 0;
+ monhdr->session_mon = cpu_to_le16(-1);
+ monhdr->session_mon_tid = 0;
+
+ ceph_encode_32(&p, 0); /* no protocol, yet */
+
+ lenp = p;
+ p += sizeof(u32);
+
+ ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
+ ceph_encode_8(&p, 1);
+ num = ARRAY_SIZE(supported_protocols);
+ ceph_encode_32(&p, num);
+ ceph_decode_need(&p, end, num * sizeof(u32), bad);
+ for (i = 0; i < num; i++)
+ ceph_encode_32(&p, supported_protocols[i]);
+
+ ret = ceph_entity_name_encode(ac->name, &p, end);
+ if (ret < 0)
+ return ret;
+ ceph_decode_need(&p, end, sizeof(u64), bad);
+ ceph_encode_64(&p, ac->global_id);
+
+ ceph_encode_32(&lenp, p - lenp - sizeof(u32));
+ return p - buf;
+
+bad:
+ return -ERANGE;
+}
+
+static int ceph_build_auth_request(struct ceph_auth_client *ac,
+ void *msg_buf, size_t msg_len)
+{
+ struct ceph_mon_request_header *monhdr = msg_buf;
+ void *p = monhdr + 1;
+ void *end = msg_buf + msg_len;
+ int ret;
+
+ monhdr->have_version = 0;
+ monhdr->session_mon = cpu_to_le16(-1);
+ monhdr->session_mon_tid = 0;
+
+ ceph_encode_32(&p, ac->protocol);
+
+ ret = ac->ops->build_request(ac, p + sizeof(u32), end);
+ if (ret < 0) {
+ pr_err("error %d building auth method %s request\n", ret,
+ ac->ops->name);
+ return ret;
+ }
+ dout(" built request %d bytes\n", ret);
+ ceph_encode_32(&p, ret);
+ return p + ret - msg_buf;
+}
+
+/*
+ * Handle auth message from monitor.
+ */
+int ceph_handle_auth_reply(struct ceph_auth_client *ac,
+ void *buf, size_t len,
+ void *reply_buf, size_t reply_len)
+{
+ void *p = buf;
+ void *end = buf + len;
+ int protocol;
+ s32 result;
+ u64 global_id;
+ void *payload, *payload_end;
+ int payload_len;
+ char *result_msg;
+ int result_msg_len;
+ int ret = -EINVAL;
+
+ dout("handle_auth_reply %p %p\n", p, end);
+ ceph_decode_need(&p, end, sizeof(u32) * 3 + sizeof(u64), bad);
+ protocol = ceph_decode_32(&p);
+ result = ceph_decode_32(&p);
+ global_id = ceph_decode_64(&p);
+ payload_len = ceph_decode_32(&p);
+ payload = p;
+ p += payload_len;
+ ceph_decode_need(&p, end, sizeof(u32), bad);
+ result_msg_len = ceph_decode_32(&p);
+ result_msg = p;
+ p += result_msg_len;
+ if (p != end)
+ goto bad;
+
+ dout(" result %d '%.*s' gid %llu len %d\n", result, result_msg_len,
+ result_msg, global_id, payload_len);
+
+ payload_end = payload + payload_len;
+
+ if (global_id && ac->global_id != global_id) {
+ dout(" set global_id %lld -> %lld\n", ac->global_id, global_id);
+ ac->global_id = global_id;
+ }
+
+ if (ac->negotiating) {
+ /* server does not support our protocols? */
+ if (!protocol && result < 0) {
+ ret = result;
+ goto out;
+ }
+ /* set up (new) protocol handler? */
+ if (ac->protocol && ac->protocol != protocol) {
+ ac->ops->destroy(ac);
+ ac->protocol = 0;
+ ac->ops = NULL;
+ }
+ if (ac->protocol != protocol) {
+ ret = ceph_auth_init_protocol(ac, protocol);
+ if (ret) {
+ pr_err("error %d on auth protocol %d init\n",
+ ret, protocol);
+ goto out;
+ }
+ }
+
+ ac->negotiating = false;
+ }
+
+ ret = ac->ops->handle_reply(ac, result, payload, payload_end);
+ if (ret == -EAGAIN) {
+ return ceph_build_auth_request(ac, reply_buf, reply_len);
+ } else if (ret) {
+ pr_err("auth method '%s' error %d\n", ac->ops->name, ret);
+ return ret;
+ }
+ return 0;
+
+bad:
+ pr_err("failed to decode auth msg\n");
+out:
+ return ret;
+}
+
+int ceph_build_auth(struct ceph_auth_client *ac,
+ void *msg_buf, size_t msg_len)
+{
+ if (!ac->protocol)
+ return ceph_auth_build_hello(ac, msg_buf, msg_len);
+ BUG_ON(!ac->ops);
+ if (ac->ops->should_authenticate(ac))
+ return ceph_build_auth_request(ac, msg_buf, msg_len);
+ return 0;
+}
+
+int ceph_auth_is_authenticated(struct ceph_auth_client *ac)
+{
+ if (!ac->ops)
+ return 0;
+ return ac->ops->is_authenticated(ac);
+}