hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

ocfs2: Introduce the DOWN message to ocfs2_control 

When the control daemon sees a node go down, it sends a DOWN message
through the ocfs2_control device.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Joel Becker 2008-02-18 17:07:09 -08:00 committed by Mark Fasheh
parent 462c7e6a25
commit de870ef022
1 changed files with 89 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

94
fs/ocfs2/stack_user.c
View File

@ -35,9 +35,21 @@
* of output is a supported protocol tag. All protocol tags are a single
* character followed by a two hex digit version number. Currently the
* only things supported is T01, for "Text-base version 0x01". Next, the
* client writes the version they would like to use. If the version tag
* written is unknown, -EINVAL is returned. Once the negotiation is
* complete, the client can start sending messages.
* client writes the version they would like to use, including the newline.
* Thus, the protocol tag is 'T01\n'. If the version tag written is
* unknown, -EINVAL is returned. Once the negotiation is complete, the
* client can start sending messages.
*
* The T01 protocol only has one message, "DOWN". It has the following
* syntax:
*
* DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline>
*
* eg:
*
* DOWN 632A924FDD844190BDA93C0DF6B94899 00000001\n
*
* This is 47 characters.
*/
/*
@ -49,6 +61,11 @@
#define OCFS2_CONTROL_HANDSHAKE_INVALID (0)
#define OCFS2_CONTROL_HANDSHAKE_READ (1)
#define OCFS2_CONTROL_HANDSHAKE_VALID (2)
#define OCFS2_CONTROL_MESSAGE_DOWN "DOWN"
#define OCFS2_CONTROL_MESSAGE_DOWN_LEN 4
#define OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN 47
#define OCFS2_TEXT_UUID_LEN 32
#define OCFS2_CONTROL_MESSAGE_NODENUM_LEN 8
/*
* ocfs2_live_connection is refcounted because the filesystem and
@ -149,7 +166,7 @@ static void ocfs2_live_connection_drop(struct ocfs2_live_connection *c)
kfree(c);
}
static ssize_t ocfs2_control_cfu(char *target, size_t target_len,
static ssize_t ocfs2_control_cfu(void *target, size_t target_len,
const char __user *buf, size_t count)
{
/* The T01 expects write(2) calls to have exactly one command */
@ -185,6 +202,73 @@ static ssize_t ocfs2_control_validate_handshake(struct file *file,
return count;
}
static void ocfs2_control_send_down(const char *uuid,
int nodenum)
{
struct ocfs2_live_connection *c;
mutex_lock(&ocfs2_control_lock);
c = ocfs2_connection_find(uuid);
if (c) {
BUG_ON(c->oc_conn == NULL);
c->oc_conn->cc_recovery_handler(nodenum,
c->oc_conn->cc_recovery_data);
}
mutex_unlock(&ocfs2_control_lock);
}
/* DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline> */
struct ocfs2_control_message_down {
char tag[OCFS2_CONTROL_MESSAGE_DOWN_LEN];
char space1;
char uuid[OCFS2_TEXT_UUID_LEN];
char space2;
char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN];
char newline;
};
static ssize_t ocfs2_control_message(struct file *file,
const char __user *buf,
size_t count)
{
ssize_t ret;
char *p = NULL;
long nodenum;
struct ocfs2_control_message_down msg;
/* Try to catch padding issues */
WARN_ON(offsetof(struct ocfs2_control_message_down, uuid) !=
(sizeof(msg.tag) + sizeof(msg.space1)));
memset(&msg, 0, sizeof(struct ocfs2_control_message_down));
ret = ocfs2_control_cfu(&msg, OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN,
buf, count);
if (ret != count)
return ret;
if (strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_DOWN,
strlen(OCFS2_CONTROL_MESSAGE_DOWN)))
return -EINVAL;
if ((msg.space1 != ' ') || (msg.space2 != ' ') ||
(msg.newline != '\n'))
return -EINVAL;
msg.space1 = msg.space2 = msg.newline = '\0';
nodenum = simple_strtol(msg.nodestr, &p, 16);
if (!p || *p)
return -EINVAL;
if ((nodenum == LONG_MIN) || (nodenum == LONG_MAX) ||
(nodenum > INT_MAX) || (nodenum < 0))
return -ERANGE;
ocfs2_control_send_down(msg.uuid, nodenum);
return count;
}
static ssize_t ocfs2_control_write(struct file *file,
const char __user *buf,
@ -204,7 +288,7 @@ static ssize_t ocfs2_control_write(struct file *file,
break;
case OCFS2_CONTROL_HANDSHAKE_VALID:
ret = count; /* XXX */
ret = ocfs2_control_message(file, buf, count);
break;
default: