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ocfs2: Add the local node id to the handshake.
This is the second part of the ocfs2_control handshake. After negotiating the ocfs2_control protocol, the daemon tells the filesystem what the local node id is via the SETN message. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Joel Becker
Mark Fasheh
parent
de870ef022
commit
3cfd4ab6b6
@ -40,8 +40,18 @@
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* unknown, -EINVAL is returned. Once the negotiation is complete, the
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* client can start sending messages.
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*
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* The T01 protocol only has one message, "DOWN". It has the following
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* syntax:
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* The T01 protocol only has two messages. First is the "SETN" message.
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* It has the following syntax:
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*
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* SETN<space><8-char-hex-nodenum><newline>
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*
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* This is 14 characters.
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*
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* The "SETN" message must be the first message following the protocol.
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* It tells ocfs2_control the local node number.
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*
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* Once the local node number has been set, the "DOWN" message can be
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* sent for node down notification. It has the following syntax:
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*
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* DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline>
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*
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@ -58,11 +68,18 @@
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*/
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#define OCFS2_CONTROL_PROTO "T01\n"
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#define OCFS2_CONTROL_PROTO_LEN 4
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/* Handshake states */
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#define OCFS2_CONTROL_HANDSHAKE_INVALID (0)
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#define OCFS2_CONTROL_HANDSHAKE_READ (1)
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#define OCFS2_CONTROL_HANDSHAKE_VALID (2)
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#define OCFS2_CONTROL_MESSAGE_DOWN "DOWN"
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#define OCFS2_CONTROL_MESSAGE_DOWN_LEN 4
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#define OCFS2_CONTROL_HANDSHAKE_PROTOCOL (2)
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#define OCFS2_CONTROL_HANDSHAKE_VALID (3)
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/* Messages */
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#define OCFS2_CONTROL_MESSAGE_OP_LEN 4
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#define OCFS2_CONTROL_MESSAGE_SETNODE_OP "SETN"
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#define OCFS2_CONTROL_MESSAGE_SETNODE_TOTAL_LEN 14
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#define OCFS2_CONTROL_MESSAGE_DOWN_OP "DOWN"
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#define OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN 47
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#define OCFS2_TEXT_UUID_LEN 32
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#define OCFS2_CONTROL_MESSAGE_NODENUM_LEN 8
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@ -79,9 +96,35 @@ struct ocfs2_live_connection {
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struct ocfs2_control_private {
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struct list_head op_list;
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int op_state;
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int op_this_node;
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};
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/* SETN<space><8-char-hex-nodenum><newline> */
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struct ocfs2_control_message_setn {
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char tag[OCFS2_CONTROL_MESSAGE_OP_LEN];
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char space;
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char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN];
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char newline;
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};
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/* DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline> */
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struct ocfs2_control_message_down {
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char tag[OCFS2_CONTROL_MESSAGE_OP_LEN];
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char space1;
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char uuid[OCFS2_TEXT_UUID_LEN];
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char space2;
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char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN];
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char newline;
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};
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union ocfs2_control_message {
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char tag[OCFS2_CONTROL_MESSAGE_OP_LEN];
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struct ocfs2_control_message_setn u_setn;
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struct ocfs2_control_message_down u_down;
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};
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static atomic_t ocfs2_control_opened;
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static int ocfs2_control_this_node = -1;
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static LIST_HEAD(ocfs2_live_connection_list);
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static LIST_HEAD(ocfs2_control_private_list);
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@ -166,38 +209,37 @@ static void ocfs2_live_connection_drop(struct ocfs2_live_connection *c)
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kfree(c);
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}
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static ssize_t ocfs2_control_cfu(void *target, size_t target_len,
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const char __user *buf, size_t count)
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static int ocfs2_control_cfu(void *target, size_t target_len,
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const char __user *buf, size_t count)
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{
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/* The T01 expects write(2) calls to have exactly one command */
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if (count != target_len)
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if ((count != target_len) ||
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(count > sizeof(union ocfs2_control_message)))
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return -EINVAL;
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if (copy_from_user(target, buf, target_len))
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return -EFAULT;
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return count;
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return 0;
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}
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static ssize_t ocfs2_control_validate_handshake(struct file *file,
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const char __user *buf,
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size_t count)
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static ssize_t ocfs2_control_validate_protocol(struct file *file,
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const char __user *buf,
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size_t count)
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{
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ssize_t ret;
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char kbuf[OCFS2_CONTROL_PROTO_LEN];
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ret = ocfs2_control_cfu(kbuf, OCFS2_CONTROL_PROTO_LEN,
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buf, count);
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if (ret != count)
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if (ret)
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return ret;
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if (strncmp(kbuf, OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN))
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return -EINVAL;
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atomic_inc(&ocfs2_control_opened);
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ocfs2_control_set_handshake_state(file,
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OCFS2_CONTROL_HANDSHAKE_VALID);
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OCFS2_CONTROL_HANDSHAKE_PROTOCOL);
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return count;
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}
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@ -219,45 +261,92 @@ static void ocfs2_control_send_down(const char *uuid,
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mutex_unlock(&ocfs2_control_lock);
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}
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/* DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline> */
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struct ocfs2_control_message_down {
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char tag[OCFS2_CONTROL_MESSAGE_DOWN_LEN];
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char space1;
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char uuid[OCFS2_TEXT_UUID_LEN];
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char space2;
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char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN];
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char newline;
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};
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static ssize_t ocfs2_control_message(struct file *file,
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const char __user *buf,
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size_t count)
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/*
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* Called whenever configuration elements are sent to /dev/ocfs2_control.
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* If all configuration elements are present, try to set the global
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* values. If not, return -EAGAIN. If there is a problem, return a
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* different error.
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*/
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static int ocfs2_control_install_private(struct file *file)
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{
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int rc = 0;
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int set_p = 1;
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struct ocfs2_control_private *p = file->private_data;
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BUG_ON(p->op_state != OCFS2_CONTROL_HANDSHAKE_PROTOCOL);
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if (p->op_this_node < 0)
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set_p = 0;
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mutex_lock(&ocfs2_control_lock);
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if (ocfs2_control_this_node < 0) {
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if (set_p)
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ocfs2_control_this_node = p->op_this_node;
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} else if (ocfs2_control_this_node != p->op_this_node)
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rc = -EINVAL;
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mutex_unlock(&ocfs2_control_lock);
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if (!rc && set_p) {
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/* We set the global values successfully */
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atomic_inc(&ocfs2_control_opened);
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ocfs2_control_set_handshake_state(file,
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OCFS2_CONTROL_HANDSHAKE_VALID);
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}
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return rc;
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}
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static int ocfs2_control_do_setnode_msg(struct file *file,
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struct ocfs2_control_message_setn *msg)
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{
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ssize_t ret;
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char *p = NULL;
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long nodenum;
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struct ocfs2_control_message_down msg;
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char *ptr = NULL;
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struct ocfs2_control_private *p = file->private_data;
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/* Try to catch padding issues */
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WARN_ON(offsetof(struct ocfs2_control_message_down, uuid) !=
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(sizeof(msg.tag) + sizeof(msg.space1)));
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memset(&msg, 0, sizeof(struct ocfs2_control_message_down));
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ret = ocfs2_control_cfu(&msg, OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN,
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buf, count);
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if (ret != count)
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return ret;
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if (strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_DOWN,
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strlen(OCFS2_CONTROL_MESSAGE_DOWN)))
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if (ocfs2_control_get_handshake_state(file) !=
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OCFS2_CONTROL_HANDSHAKE_PROTOCOL)
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return -EINVAL;
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if ((msg.space1 != ' ') || (msg.space2 != ' ') ||
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(msg.newline != '\n'))
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if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_SETNODE_OP,
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OCFS2_CONTROL_MESSAGE_OP_LEN))
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return -EINVAL;
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msg.space1 = msg.space2 = msg.newline = '\0';
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nodenum = simple_strtol(msg.nodestr, &p, 16);
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if ((msg->space != ' ') || (msg->newline != '\n'))
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return -EINVAL;
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msg->space = msg->newline = '\0';
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nodenum = simple_strtol(msg->nodestr, &ptr, 16);
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if (!ptr || *ptr)
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return -EINVAL;
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if ((nodenum == LONG_MIN) || (nodenum == LONG_MAX) ||
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(nodenum > INT_MAX) || (nodenum < 0))
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return -ERANGE;
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p->op_this_node = nodenum;
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return ocfs2_control_install_private(file);
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}
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static int ocfs2_control_do_down_msg(struct file *file,
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struct ocfs2_control_message_down *msg)
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{
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long nodenum;
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char *p = NULL;
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if (ocfs2_control_get_handshake_state(file) !=
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OCFS2_CONTROL_HANDSHAKE_VALID)
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return -EINVAL;
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if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_DOWN_OP,
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OCFS2_CONTROL_MESSAGE_OP_LEN))
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return -EINVAL;
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if ((msg->space1 != ' ') || (msg->space2 != ' ') ||
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(msg->newline != '\n'))
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return -EINVAL;
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msg->space1 = msg->space2 = msg->newline = '\0';
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nodenum = simple_strtol(msg->nodestr, &p, 16);
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if (!p || *p)
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return -EINVAL;
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@ -265,9 +354,40 @@ static ssize_t ocfs2_control_message(struct file *file,
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(nodenum > INT_MAX) || (nodenum < 0))
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return -ERANGE;
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ocfs2_control_send_down(msg.uuid, nodenum);
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ocfs2_control_send_down(msg->uuid, nodenum);
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return count;
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return 0;
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}
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static ssize_t ocfs2_control_message(struct file *file,
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const char __user *buf,
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size_t count)
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{
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ssize_t ret;
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union ocfs2_control_message msg;
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/* Try to catch padding issues */
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WARN_ON(offsetof(struct ocfs2_control_message_down, uuid) !=
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(sizeof(msg.u_down.tag) + sizeof(msg.u_down.space1)));
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memset(&msg, 0, sizeof(union ocfs2_control_message));
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ret = ocfs2_control_cfu(&msg, count, buf, count);
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if (ret)
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goto out;
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if ((count == OCFS2_CONTROL_MESSAGE_SETNODE_TOTAL_LEN) &&
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!strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_SETNODE_OP,
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OCFS2_CONTROL_MESSAGE_OP_LEN))
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ret = ocfs2_control_do_setnode_msg(file, &msg.u_setn);
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else if ((count == OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN) &&
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!strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_DOWN_OP,
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OCFS2_CONTROL_MESSAGE_OP_LEN))
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ret = ocfs2_control_do_down_msg(file, &msg.u_down);
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else
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ret = -EINVAL;
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out:
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return ret ? ret : count;
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}
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static ssize_t ocfs2_control_write(struct file *file,
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@ -283,10 +403,11 @@ static ssize_t ocfs2_control_write(struct file *file,
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break;
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case OCFS2_CONTROL_HANDSHAKE_READ:
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ret = ocfs2_control_validate_handshake(file, buf,
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count);
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ret = ocfs2_control_validate_protocol(file, buf,
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count);
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break;
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case OCFS2_CONTROL_HANDSHAKE_PROTOCOL:
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case OCFS2_CONTROL_HANDSHAKE_VALID:
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ret = ocfs2_control_message(file, buf, count);
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break;
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@ -350,6 +471,8 @@ static int ocfs2_control_release(struct inode *inode, struct file *file)
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"an emergency restart!\n");
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emergency_restart();
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}
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/* Last valid close clears the node number */
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ocfs2_control_this_node = -1;
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}
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out:
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@ -370,6 +493,7 @@ static int ocfs2_control_open(struct inode *inode, struct file *file)
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p = kzalloc(sizeof(struct ocfs2_control_private), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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p->op_this_node = -1;
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mutex_lock(&ocfs2_control_lock);
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file->private_data = p;
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