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authorAlexander Aring <aahringo@redhat.com>2021-05-21 22:08:42 +0300
committerDavid Teigland <teigland@redhat.com>2021-05-25 17:22:20 +0300
commit8f2dc78dbc2010b497bb58e0460cb44c678a3c5b (patch)
tree63b4528cf5521cfbf0c5aa085693170223afc634 /fs/dlm
parenta070a91cf1402b5328d3517d1fccbdeec58d3f2d (diff)
downloadlinux-8f2dc78dbc2010b497bb58e0460cb44c678a3c5b.tar.xz
fs: dlm: make buffer handling per msg
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>
Diffstat (limited to 'fs/dlm')
-rw-r--r--fs/dlm/dlm_internal.h1
-rw-r--r--fs/dlm/lowcomms.c101
-rw-r--r--fs/dlm/lowcomms.h7
-rw-r--r--fs/dlm/midcomms.c7
-rw-r--r--fs/dlm/rcom.c40
5 files changed, 117 insertions, 39 deletions
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index ae3fdf6d9cda..e8dc5f4f1f9e 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -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)
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 14ca3eda6a83..d222e6088ab2 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -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);
+ msg = kzalloc(sizeof(*msg), allocation);
+ if (!msg) {
+ srcu_read_unlock(&connections_srcu, idx);
+ return NULL;
+ }
+
+ kref_init(&msg->ref);
+
+ 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 */
- e->idx = idx;
+ msg->idx = idx;
- return e;
+ 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);
diff --git a/fs/dlm/lowcomms.h b/fs/dlm/lowcomms.h
index 48bbc4e18761..cdb8f066f0d8 100644
--- a/fs/dlm/lowcomms.h
+++ b/fs/dlm/lowcomms.h
@@ -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);
diff --git a/fs/dlm/midcomms.c b/fs/dlm/midcomms.c
index 1a280dda99d3..aadb3781bebe 100644
--- a/fs/dlm/midcomms.c
+++ b/fs/dlm/midcomms.c
@@ -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) { }
diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c
index 2661674364af..6f653a339bea 100644
--- a/fs/dlm/rcom.c
+++ b/fs/dlm/rcom.c
@@ -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)