int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data)
{
int ret;
unsigned int locklen;
struct dlm_ctxt *dlm = data;
struct dlm_lock_resource *res = NULL;
struct dlm_lock *lock = NULL;
struct dlm_proxy_ast *past = (struct dlm_proxy_ast *) msg->buf;
char *name;
struct list_head *head = NULL;
__be64 cookie;
u32 flags;
u8 node;
if (!dlm_grab(dlm)) {
dlm_error(DLM_REJECTED);
return DLM_REJECTED;
}
mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
"Domain %s not fully joined!\n", dlm->name);
name = past->name;
locklen = past->namelen;
cookie = past->cookie;
flags = be32_to_cpu(past->flags);
node = past->node_idx;
if (locklen > DLM_LOCKID_NAME_MAX) {
ret = DLM_IVBUFLEN;
mlog(ML_ERROR, "Invalid name length (%d) in proxy ast "
"handler!\n", locklen);
goto leave;
}
if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) ==
(LKM_PUT_LVB|LKM_GET_LVB)) {
mlog(ML_ERROR, "Both PUT and GET lvb specified, (0x%x)\n",
flags);
ret = DLM_BADARGS;
goto leave;
}
mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" :
(flags & LKM_GET_LVB ? "get lvb" : "none"));
mlog(0, "type=%d, blocked_type=%d\n", past->type, past->blocked_type);
if (past->type != DLM_AST &&
past->type != DLM_BAST) {
mlog(ML_ERROR, "Unknown ast type! %d, cookie=%u:%llu"
"name=%.*s, node=%u\n", past->type,
dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
locklen, name, node);
ret = DLM_IVLOCKID;
goto leave;
}
res = dlm_lookup_lockres(dlm, name, locklen);
if (!res) {
mlog(0, "Got %sast for unknown lockres! cookie=%u:%llu, "
"name=%.*s, node=%u\n", (past->type == DLM_AST ? "" : "b"),
dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
locklen, name, node);
ret = DLM_IVLOCKID;
goto leave;
}
/* cannot get a proxy ast message if this node owns it */
BUG_ON(res->owner == dlm->node_num);
mlog(0, "%s: res %.*s\n", dlm->name, res->lockname.len,
res->lockname.name);
spin_lock(&res->spinlock);
if (res->state & DLM_LOCK_RES_RECOVERING) {
mlog(0, "Responding with DLM_RECOVERING!\n");
ret = DLM_RECOVERING;
goto unlock_out;
}
if (res->state & DLM_LOCK_RES_MIGRATING) {
mlog(0, "Responding with DLM_MIGRATING!\n");
ret = DLM_MIGRATING;
goto unlock_out;
}
/* try convert queue for both ast/bast */
head = &res->converting;
lock = NULL;
list_for_each_entry(lock, head, list) {
if (lock->ml.cookie == cookie)
goto do_ast;
}
/* if not on convert, try blocked for ast, granted for bast */
if (past->type == DLM_AST)
head = &res->blocked;
else
head = &res->granted;
list_for_each_entry(lock, head, list) {
if (lock->ml.cookie == cookie)
goto do_ast;
}
mlog(0, "Got %sast for unknown lock! cookie=%u:%llu, name=%.*s, "
"node=%u\n", past->type == DLM_AST ? "" : "b",
dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
locklen, name, node);
ret = DLM_NORMAL;
unlock_out:
spin_unlock(&res->spinlock);
goto leave;
do_ast:
ret = DLM_NORMAL;
if (past->type == DLM_AST) {
/* do not alter lock refcount. switching lists. */
list_move_tail(&lock->list, &res->granted);
mlog(0, "%s: res %.*s, lock %u:%llu, Granted type %d => %d\n",
dlm->name, res->lockname.len, res->lockname.name,
dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
lock->ml.type, lock->ml.convert_type);
if (lock->ml.convert_type != LKM_IVMODE) {
lock->ml.type = lock->ml.convert_type;
lock->ml.convert_type = LKM_IVMODE;
} else {
// should already be there....
}
lock->lksb->status = DLM_NORMAL;
/* if we requested the lvb, fetch it into our lksb now */
if (flags & LKM_GET_LVB) {
BUG_ON(!(lock->lksb->flags & DLM_LKSB_GET_LVB));
memcpy(lock->lksb->lvb, past->lvb, DLM_LVB_LEN);
}
}
spin_unlock(&res->spinlock);
if (past->type == DLM_AST)
dlm_do_local_ast(dlm, res, lock);
else
dlm_do_local_bast(dlm, res, lock, past->blocked_type);
leave:
if (res)
dlm_lockres_put(res);
dlm_put(dlm);
return ret;
}
int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data)
{
int ret;
unsigned int locklen;
struct dlm_ctxt *dlm = data;
struct dlm_lock_resource *res = NULL;
struct dlm_lock *lock = NULL;
struct dlm_proxy_ast *past = (struct dlm_proxy_ast *) msg->buf;
char *name;
struct list_head *iter, *head=NULL;
u64 cookie;
u32 flags;
u8 node;
if (!dlm_grab(dlm)) {
dlm_error(DLM_REJECTED);
return DLM_REJECTED;
}
mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
"Domain %s not fully joined!\n", dlm->name);
name = past->name;
locklen = past->namelen;
cookie = past->cookie;
flags = be32_to_cpu(past->flags);
node = past->node_idx;
if (locklen > DLM_LOCKID_NAME_MAX) {
ret = DLM_IVBUFLEN;
mlog(ML_ERROR, "Invalid name length (%d) in proxy ast "
"handler!\n", locklen);
goto leave;
}
if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) ==
(LKM_PUT_LVB|LKM_GET_LVB)) {
mlog(ML_ERROR, "Both PUT and GET lvb specified, (0x%x)\n",
flags);
ret = DLM_BADARGS;
goto leave;
}
mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" :
(flags & LKM_GET_LVB ? "get lvb" : "none"));
mlog(0, "type=%d, blocked_type=%d\n", past->type, past->blocked_type);
if (past->type != DLM_AST &&
past->type != DLM_BAST) {
mlog(ML_ERROR, "Unknown ast type! %d, cookie=%u:%llu"
"name=%.*s, node=%u\n", past->type,
dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
locklen, name, node);
ret = DLM_IVLOCKID;
goto leave;
}
res = dlm_lookup_lockres(dlm, name, locklen);
if (!res) {
mlog(0, "Got %sast for unknown lockres! cookie=%u:%llu, "
"name=%.*s, node=%u\n", (past->type == DLM_AST ? "" : "b"),
dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
locklen, name, node);
ret = DLM_IVLOCKID;
goto leave;
}
/* cannot get a proxy ast message if this node owns it */
BUG_ON(res->owner == dlm->node_num);
mlog(0, "lockres %.*s\n", res->lockname.len, res->lockname.name);
spin_lock(&res->spinlock);
if (res->state & DLM_LOCK_RES_RECOVERING) {
mlog(0, "Responding with DLM_RECOVERING!\n");
ret = DLM_RECOVERING;
goto unlock_out;
}
if (res->state & DLM_LOCK_RES_MIGRATING) {
mlog(0, "Responding with DLM_MIGRATING!\n");
ret = DLM_MIGRATING;
goto unlock_out;
}
/* try convert queue for both ast/bast */
head = &res->converting;
lock = NULL;
list_for_each(iter, head) {
lock = list_entry (iter, struct dlm_lock, list);
if (lock->ml.cookie == cookie)
goto do_ast;
}
/*
* locking:
* caller needs: none
* taken: takes and drops res->spinlock
* held on exit: none
* returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID,
* return value from dlmunlock_master
*/
int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data,
void **ret_data)
{
struct dlm_ctxt *dlm = data;
struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf;
struct dlm_lock_resource *res = NULL;
struct list_head *iter;
struct dlm_lock *lock = NULL;
enum dlm_status status = DLM_NORMAL;
int found = 0, i;
struct dlm_lockstatus *lksb = NULL;
int ignore;
u32 flags;
struct list_head *queue;
flags = be32_to_cpu(unlock->flags);
if (flags & LKM_GET_LVB) {
mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n");
return DLM_BADARGS;
}
if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) {
mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL "
"request!\n");
return DLM_BADARGS;
}
if (unlock->namelen > DLM_LOCKID_NAME_MAX) {
mlog(ML_ERROR, "Invalid name length in unlock handler!\n");
return DLM_IVBUFLEN;
}
if (!dlm_grab(dlm))
return DLM_REJECTED;
mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
"Domain %s not fully joined!\n", dlm->name);
mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none");
res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen);
if (!res) {
/* We assume here that a no lock resource simply means
* it was migrated away and destroyed before the other
* node could detect it. */
mlog(0, "returning DLM_FORWARD -- res no longer exists\n");
status = DLM_FORWARD;
goto not_found;
}
queue=&res->granted;
found = 0;
spin_lock(&res->spinlock);
if (res->state & DLM_LOCK_RES_RECOVERING) {
spin_unlock(&res->spinlock);
mlog(0, "returning DLM_RECOVERING\n");
status = DLM_RECOVERING;
goto leave;
}
if (res->state & DLM_LOCK_RES_MIGRATING) {
spin_unlock(&res->spinlock);
mlog(0, "returning DLM_MIGRATING\n");
status = DLM_MIGRATING;
goto leave;
}
if (res->owner != dlm->node_num) {
spin_unlock(&res->spinlock);
mlog(0, "returning DLM_FORWARD -- not master\n");
status = DLM_FORWARD;
goto leave;
}
for (i=0; i<3; i++) {
list_for_each(iter, queue) {
lock = list_entry(iter, struct dlm_lock, list);
if (lock->ml.cookie == unlock->cookie &&
lock->ml.node == unlock->node_idx) {
dlm_lock_get(lock);
found = 1;
break;
}
}
if (found)
break;
/* scan granted -> converting -> blocked queues */
queue++;
}