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fs: dlm: make buffer handling per msg

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This patch makes the void pointer handle for lowcomms functionality per
message and not per page allocation entry. A refcount handling for the
handle was added to keep the message alive until the user doesn't need
it anymore.

There exists now a per message callback which will be called when
allocating a new buffer. This callback will be guaranteed to be called
according the order of the sending buffer, which can be used that the
caller increments a sequence number for the dlm message handle.

For transition process we cast the dlm_mhandle to dlm_msg and vice versa
until the midcomms layer will implement a specific dlm_mhandle structure.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2021-05-21 15:08:42 -04:00 committed by David Teigland
parent a070a91cf1
commit 8f2dc78dbc
5 changed files with 119 additions and 41 deletions
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1
fs/dlm/dlm_internal.h
View File

@ -57,6 +57,7 @@ struct dlm_header;
struct dlm_message;
struct dlm_rcom;
struct dlm_mhandle;
struct dlm_msg;
#define log_print(fmt, args...) \
printk(KERN_ERR "dlm: "fmt"\n" , ##args)

105
fs/dlm/lowcomms.c
View File

@ -119,8 +119,19 @@ struct writequeue_entry {
int len;
int end;
int users;
int idx; /* get()/commit() idx exchange */
struct connection *con;
struct list_head msgs;
struct kref ref;
};
struct dlm_msg {
struct writequeue_entry *entry;
void *ppc;
int len;
int idx; /* new()/commit() idx exchange */
struct list_head list;
struct kref ref;
};
struct dlm_node_addr {
@ -1022,12 +1033,37 @@ accept_err:
return result;
}
static void free_entry(struct writequeue_entry *e)
static void dlm_page_release(struct kref *kref)
{
struct writequeue_entry *e = container_of(kref, struct writequeue_entry,
ref);
__free_page(e->page);
kfree(e);
}
static void dlm_msg_release(struct kref *kref)
{
struct dlm_msg *msg = container_of(kref, struct dlm_msg, ref);
kref_put(&msg->entry->ref, dlm_page_release);
kfree(msg);
}
static void free_entry(struct writequeue_entry *e)
{
struct dlm_msg *msg, *tmp;
list_for_each_entry_safe(msg, tmp, &e->msgs, list) {
list_del(&msg->list);
kref_put(&msg->ref, dlm_msg_release);
}
list_del(&e->list);
atomic_dec(&e->con->writequeue_cnt);
kref_put(&e->ref, dlm_page_release);
}
/*
* writequeue_entry_complete - try to delete and free write queue entry
* @e: write queue entry to try to delete
@ -1040,11 +1076,8 @@ static void writequeue_entry_complete(struct writequeue_entry *e, int completed)
e->offset += completed;
e->len -= completed;
if (e->len == 0 && e->users == 0) {
list_del(&e->list);
atomic_dec(&e->con->writequeue_cnt);
if (e->len == 0 && e->users == 0)
free_entry(e);
}
}
/*
@ -1410,12 +1443,16 @@ static struct writequeue_entry *new_writequeue_entry(struct connection *con,
entry->con = con;
entry->users = 1;
kref_init(&entry->ref);
INIT_LIST_HEAD(&entry->msgs);
return entry;
}
static struct writequeue_entry *new_wq_entry(struct connection *con, int len,
gfp_t allocation, char **ppc)
gfp_t allocation, char **ppc,
void (*cb)(struct dlm_mhandle *mh),
struct dlm_mhandle *mh)
{
struct writequeue_entry *e;
@ -1423,7 +1460,12 @@ static struct writequeue_entry *new_wq_entry(struct connection *con, int len,
if (!list_empty(&con->writequeue)) {
e = list_last_entry(&con->writequeue, struct writequeue_entry, list);
if (DLM_WQ_REMAIN_BYTES(e) >= len) {
kref_get(&e->ref);
*ppc = page_address(e->page) + e->end;
if (cb)
cb(mh);
e->end += len;
e->users++;
spin_unlock(&con->writequeue_lock);
@ -1437,21 +1479,28 @@ static struct writequeue_entry *new_wq_entry(struct connection *con, int len,
if (!e)
return NULL;
kref_get(&e->ref);
*ppc = page_address(e->page);
e->end += len;
atomic_inc(&con->writequeue_cnt);
spin_lock(&con->writequeue_lock);
if (cb)
cb(mh);
list_add_tail(&e->list, &con->writequeue);
spin_unlock(&con->writequeue_lock);
return e;
};
void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc)
struct dlm_msg *dlm_lowcomms_new_msg(int nodeid, int len, gfp_t allocation,
char **ppc, void (*cb)(struct dlm_mhandle *mh),
struct dlm_mhandle *mh)
{
struct writequeue_entry *e;
struct connection *con;
struct dlm_msg *msg;
int idx;
if (len > DEFAULT_BUFFER_SIZE ||
@ -1469,25 +1518,41 @@ void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc)
return NULL;
}
e = new_wq_entry(con, len, allocation, ppc);
if (!e) {
msg = kzalloc(sizeof(*msg), allocation);
if (!msg) {
srcu_read_unlock(&connections_srcu, idx);
return NULL;
}
/* we assume if successful commit must called */
e->idx = idx;
kref_init(&msg->ref);
return e;
e = new_wq_entry(con, len, allocation, ppc, cb, mh);
if (!e) {
srcu_read_unlock(&connections_srcu, idx);
kfree(msg);
return NULL;
}
msg->ppc = *ppc;
msg->len = len;
msg->entry = e;
/* we assume if successful commit must called */
msg->idx = idx;
return msg;
}
void dlm_lowcomms_commit_buffer(void *mh)
void dlm_lowcomms_commit_msg(struct dlm_msg *msg)
{
struct writequeue_entry *e = (struct writequeue_entry *)mh;
struct writequeue_entry *e = msg->entry;
struct connection *con = e->con;
int users;
spin_lock(&con->writequeue_lock);
kref_get(&msg->ref);
list_add(&msg->list, &e->msgs);
users = --e->users;
if (users)
goto out;
@ -1496,15 +1561,20 @@ void dlm_lowcomms_commit_buffer(void *mh)
spin_unlock(&con->writequeue_lock);
queue_work(send_workqueue, &con->swork);
srcu_read_unlock(&connections_srcu, e->idx);
srcu_read_unlock(&connections_srcu, msg->idx);
return;
out:
spin_unlock(&con->writequeue_lock);
srcu_read_unlock(&connections_srcu, e->idx);
srcu_read_unlock(&connections_srcu, msg->idx);
return;
}
void dlm_lowcomms_put_msg(struct dlm_msg *msg)
{
kref_put(&msg->ref, dlm_msg_release);
}
/* Send a message */
static void send_to_sock(struct connection *con)
{
@ -1590,7 +1660,6 @@ static void clean_one_writequeue(struct connection *con)
spin_lock(&con->writequeue_lock);
list_for_each_entry_safe(e, safe, &con->writequeue, list) {
list_del(&e->list);
free_entry(e);
}
spin_unlock(&con->writequeue_lock);

7
fs/dlm/lowcomms.h
View File

@ -22,8 +22,11 @@ void dlm_lowcomms_shutdown(void);
void dlm_lowcomms_stop(void);
void dlm_lowcomms_exit(void);
int dlm_lowcomms_close(int nodeid);
void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc);
void dlm_lowcomms_commit_buffer(void *mh);
struct dlm_msg *dlm_lowcomms_new_msg(int nodeid, int len, gfp_t allocation,
char **ppc, void (*cb)(struct dlm_mhandle *mh),
struct dlm_mhandle *mh);
void dlm_lowcomms_commit_msg(struct dlm_msg *msg);
void dlm_lowcomms_put_msg(struct dlm_msg *msg);
int dlm_lowcomms_connect_node(int nodeid);
int dlm_lowcomms_nodes_set_mark(int nodeid, unsigned int mark);
int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len);

7
fs/dlm/midcomms.c
View File

@ -31,12 +31,15 @@
struct dlm_mhandle *dlm_midcomms_get_mhandle(int nodeid, int len,
gfp_t allocation, char **ppc)
{
return dlm_lowcomms_get_buffer(nodeid, len, allocation, ppc);
return (struct dlm_mhandle *)dlm_lowcomms_new_msg(nodeid, len,
allocation, ppc,
NULL, NULL);
}
void dlm_midcomms_commit_mhandle(struct dlm_mhandle *mh)
{
dlm_lowcomms_commit_buffer(mh);
dlm_lowcomms_commit_msg((struct dlm_msg *)mh);
dlm_lowcomms_put_msg((struct dlm_msg *)mh);
}
void dlm_midcomms_add_member(int nodeid) { }

40
fs/dlm/rcom.c
View File

@ -70,21 +70,22 @@ static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
static int create_rcom_stateless(struct dlm_ls *ls, int to_nodeid, int type,
int len, struct dlm_rcom **rc_ret,
void **mh_ret)
struct dlm_msg **msg_ret)
{
int mb_len = sizeof(struct dlm_rcom) + len;
void *mh;
struct dlm_msg *msg;
char *mb;
mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_NOFS, &mb);
if (!mh) {
msg = dlm_lowcomms_new_msg(to_nodeid, mb_len, GFP_NOFS, &mb,
NULL, NULL);
if (!msg) {
log_print("create_rcom to %d type %d len %d ENOBUFS",
to_nodeid, type, len);
return -ENOBUFS;
}
_create_rcom(ls, to_nodeid, type, len, rc_ret, mb, mb_len);
*mh_ret = mh;
*msg_ret = msg;
return 0;
}
@ -100,11 +101,12 @@ static void send_rcom(struct dlm_ls *ls, struct dlm_mhandle *mh,
dlm_midcomms_commit_mhandle(mh);
}
static void send_rcom_stateless(struct dlm_ls *ls, void *mh,
static void send_rcom_stateless(struct dlm_ls *ls, struct dlm_msg *msg,
struct dlm_rcom *rc)
{
_send_rcom(ls, rc);
dlm_lowcomms_commit_buffer(mh);
dlm_lowcomms_commit_msg(msg);
dlm_lowcomms_put_msg(msg);
}
static void set_rcom_status(struct dlm_ls *ls, struct rcom_status *rs,
@ -180,8 +182,8 @@ static void disallow_sync_reply(struct dlm_ls *ls)
int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags)
{
struct dlm_rcom *rc;
struct dlm_msg *msg;
int error = 0;
void *mh;
ls->ls_recover_nodeid = nodeid;
@ -193,7 +195,7 @@ int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags)
retry:
error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS,
sizeof(struct rcom_status), &rc, &mh);
sizeof(struct rcom_status), &rc, &msg);
if (error)
goto out;
@ -202,7 +204,7 @@ retry:
allow_sync_reply(ls, &rc->rc_id);
memset(ls->ls_recover_buf, 0, LOWCOMMS_MAX_TX_BUFFER_LEN);
send_rcom_stateless(ls, mh, rc);
send_rcom_stateless(ls, msg, rc);
error = dlm_wait_function(ls, &rcom_response);
disallow_sync_reply(ls);
@ -234,9 +236,9 @@ static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
uint32_t status;
int nodeid = rc_in->rc_header.h_nodeid;
int len = sizeof(struct rcom_config);
struct dlm_msg *msg;
int num_slots = 0;
int error;
void *mh;
if (!dlm_slots_version(&rc_in->rc_header)) {
status = dlm_recover_status(ls);
@ -258,7 +260,7 @@ static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
do_create:
error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS_REPLY,
len, &rc, &mh);
len, &rc, &msg);
if (error)
return;
@ -285,7 +287,7 @@ static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
spin_unlock(&ls->ls_recover_lock);
do_send:
send_rcom_stateless(ls, mh, rc);
send_rcom_stateless(ls, msg, rc);
}
static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
@ -310,14 +312,14 @@ static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
{
struct dlm_rcom *rc;
struct dlm_msg *msg;
int error = 0;
void *mh;
ls->ls_recover_nodeid = nodeid;
retry:
error = create_rcom_stateless(ls, nodeid, DLM_RCOM_NAMES, last_len,
&rc, &mh);
&rc, &msg);
if (error)
goto out;
memcpy(rc->rc_buf, last_name, last_len);
@ -325,7 +327,7 @@ retry:
allow_sync_reply(ls, &rc->rc_id);
memset(ls->ls_recover_buf, 0, LOWCOMMS_MAX_TX_BUFFER_LEN);
send_rcom_stateless(ls, mh, rc);
send_rcom_stateless(ls, msg, rc);
error = dlm_wait_function(ls, &rcom_response);
disallow_sync_reply(ls);
@ -339,14 +341,14 @@ static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
{
struct dlm_rcom *rc;
int error, inlen, outlen, nodeid;
void *mh;
struct dlm_msg *msg;
nodeid = rc_in->rc_header.h_nodeid;
inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom);
outlen = LOWCOMMS_MAX_TX_BUFFER_LEN - sizeof(struct dlm_rcom);
error = create_rcom_stateless(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen,
&rc, &mh);
&rc, &msg);
if (error)
return;
rc->rc_id = rc_in->rc_id;
@ -354,7 +356,7 @@ static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
nodeid);
send_rcom_stateless(ls, mh, rc);
send_rcom_stateless(ls, msg, rc);
}
int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)