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libceph: support for blacklisting clients 

Reuse ceph_mon_generic_request infrastructure for sending monitor
commands.  In particular, add support for 'blacklist add' to prevent
other, non-responsive clients from making further updates.

Signed-off-by: Douglas Fuller <dfuller@redhat.com>
[idryomov@gmail.com: refactor, misc fixes throughout]
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Douglas Fuller 2015-07-22 20:59:52 -04:00 committed by Ilya Dryomov
parent d4ed4a5305
commit 6305a3b415
3 changed files with 96 additions and 0 deletions
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11
include/linux/ceph/ceph_fs.h
View File

@ -138,6 +138,9 @@ struct ceph_dir_layout {
#define CEPH_MSG_POOLOP_REPLY 48
#define CEPH_MSG_POOLOP 49
/* mon commands */
#define CEPH_MSG_MON_COMMAND 50
#define CEPH_MSG_MON_COMMAND_ACK 51
/* osd */
#define CEPH_MSG_OSD_MAP 41
@ -176,6 +179,14 @@ struct ceph_mon_statfs_reply {
struct ceph_statfs st;
} __attribute__ ((packed));
struct ceph_mon_command {
struct ceph_mon_request_header monhdr;
struct ceph_fsid fsid;
__le32 num_strs; /* always 1 */
__le32 str_len;
char str[];
} __attribute__ ((packed));
struct ceph_osd_getmap {
struct ceph_mon_request_header monhdr;
struct ceph_fsid fsid;

3
include/linux/ceph/mon_client.h
View File

@ -141,6 +141,9 @@ int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
ceph_monc_callback_t cb, u64 private_data);
int ceph_monc_blacklist_add(struct ceph_mon_client *monc,
struct ceph_entity_addr *client_addr);
extern int ceph_monc_open_session(struct ceph_mon_client *monc);
extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);

82
net/ceph/mon_client.c
View File

@ -835,6 +835,83 @@ int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
}
EXPORT_SYMBOL(ceph_monc_get_version_async);
static void handle_command_ack(struct ceph_mon_client *monc,
struct ceph_msg *msg)
{
struct ceph_mon_generic_request *req;
void *p = msg->front.iov_base;
void *const end = p + msg->front_alloc_len;
u64 tid = le64_to_cpu(msg->hdr.tid);
dout("%s msg %p tid %llu\n", __func__, msg, tid);
ceph_decode_need(&p, end, sizeof(struct ceph_mon_request_header) +
sizeof(u32), bad);
p += sizeof(struct ceph_mon_request_header);
mutex_lock(&monc->mutex);
req = lookup_generic_request(&monc->generic_request_tree, tid);
if (!req) {
mutex_unlock(&monc->mutex);
return;
}
req->result = ceph_decode_32(&p);
__finish_generic_request(req);
mutex_unlock(&monc->mutex);
complete_generic_request(req);
return;
bad:
pr_err("corrupt mon_command ack, tid %llu\n", tid);
ceph_msg_dump(msg);
}
int ceph_monc_blacklist_add(struct ceph_mon_client *monc,
struct ceph_entity_addr *client_addr)
{
struct ceph_mon_generic_request *req;
struct ceph_mon_command *h;
int ret = -ENOMEM;
int len;
req = alloc_generic_request(monc, GFP_NOIO);
if (!req)
goto out;
req->request = ceph_msg_new(CEPH_MSG_MON_COMMAND, 256, GFP_NOIO, true);
if (!req->request)
goto out;
req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, 512, GFP_NOIO,
true);
if (!req->reply)
goto out;
mutex_lock(&monc->mutex);
register_generic_request(req);
h = req->request->front.iov_base;
h->monhdr.have_version = 0;
h->monhdr.session_mon = cpu_to_le16(-1);
h->monhdr.session_mon_tid = 0;
h->fsid = monc->monmap->fsid;
h->num_strs = cpu_to_le32(1);
len = sprintf(h->str, "{ \"prefix\": \"osd blacklist\", \
\"blacklistop\": \"add\", \
\"addr\": \"%pISpc/%u\" }",
&client_addr->in_addr, le32_to_cpu(client_addr->nonce));
h->str_len = cpu_to_le32(len);
send_generic_request(monc, req);
mutex_unlock(&monc->mutex);
ret = wait_generic_request(req);
out:
put_generic_request(req);
return ret;
}
EXPORT_SYMBOL(ceph_monc_blacklist_add);
/*
* Resend pending generic requests.
*/
@ -1139,6 +1216,10 @@ static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
handle_get_version_reply(monc, msg);
break;
case CEPH_MSG_MON_COMMAND_ACK:
handle_command_ack(monc, msg);
break;
case CEPH_MSG_MON_MAP:
ceph_monc_handle_map(monc, msg);
break;
@ -1178,6 +1259,7 @@ static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
m = ceph_msg_get(monc->m_subscribe_ack);
break;
case CEPH_MSG_STATFS_REPLY:
case CEPH_MSG_MON_COMMAND_ACK:
return get_generic_reply(con, hdr, skip);
case CEPH_MSG_AUTH_REPLY:
m = ceph_msg_get(monc->m_auth_reply);