[Cluster-devel] [PATCHv4 dlm/next 4/8] fs: dlm: add functionality to re-transmit a message
Alexander Aring
aahringo at redhat.com
Fri Apr 9 14:48:55 UTC 2021
This patch introduces a retransmit functionality for a lowcomms message
handle. It's just allocates a new buffer and transmit it again, no
special handling about prioritize it because keeping bytestream in order.
To avoid another connection look some refactor was done to make a new
buffer allocation with a preexisting connection pointer.
Signed-off-by: Alexander Aring <aahringo at redhat.com>
---
fs/dlm/lowcomms.c | 55 ++++++++++++++++++++++++++++++++++-------------
fs/dlm/lowcomms.h | 1 +
2 files changed, 41 insertions(+), 15 deletions(-)
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index ade1a5266e4a..fb04448c4e48 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -1447,25 +1447,14 @@ static struct writequeue_entry *new_wq_entry(struct connection *con, int len,
return e;
};
-void *dlm_lowcomms_new_buffer(int nodeid, int len, gfp_t allocation, char **ppc,
- void (*cb)(void *buf, void *priv), void *priv)
+static void *dlm_lowcomms_new_buffer_con(struct connection *con, int len,
+ gfp_t allocation, char **ppc,
+ void (*cb)(void *buf, void *priv),
+ void *priv)
{
struct writequeue_entry *e;
- struct connection *con;
struct dlm_msg *msg;
- if (len > DEFAULT_BUFFER_SIZE ||
- len < sizeof(struct dlm_header)) {
- BUILD_BUG_ON(PAGE_SIZE < DEFAULT_BUFFER_SIZE);
- log_print("failed to allocate a buffer of size %d", len);
- WARN_ON(1);
- return NULL;
- }
-
- con = nodeid2con(nodeid, allocation);
- if (!con)
- return NULL;
-
msg = kzalloc(sizeof(*msg), allocation);
if (!msg)
return NULL;
@@ -1485,6 +1474,26 @@ void *dlm_lowcomms_new_buffer(int nodeid, int len, gfp_t allocation, char **ppc,
return msg;
}
+void *dlm_lowcomms_new_buffer(int nodeid, int len, gfp_t allocation, char **ppc,
+ void (*cb)(void *buf, void *priv), void *priv)
+{
+ struct connection *con;
+
+ if (len > DEFAULT_BUFFER_SIZE ||
+ len < sizeof(struct dlm_header)) {
+ BUILD_BUG_ON(PAGE_SIZE < DEFAULT_BUFFER_SIZE);
+ log_print("failed to allocate a buffer of size %d", len);
+ WARN_ON(1);
+ return NULL;
+ }
+
+ con = nodeid2con(nodeid, allocation);
+ if (!con)
+ return NULL;
+
+ return dlm_lowcomms_new_buffer_con(con, len, GFP_ATOMIC, ppc, cb, priv);
+}
+
void dlm_lowcomms_commit_buffer(void *mh)
{
struct dlm_msg *msg = mh;
@@ -1525,6 +1534,22 @@ void dlm_lowcomms_get_buffer(void *mh)
kref_get(&msg->ref);
}
+void dlm_lowcomms_resend_buffer(void *mh)
+{
+ struct dlm_msg *msg = mh;
+ void *mh_new;
+ char *ppc;
+
+ mh_new = dlm_lowcomms_new_buffer_con(msg->entry->con, msg->len,
+ GFP_NOFS, &ppc, NULL, NULL);
+ if (!mh_new)
+ return;
+
+ memcpy(ppc, msg->ppc, msg->len);
+ dlm_lowcomms_commit_buffer(mh_new);
+ dlm_lowcomms_put_buffer(mh_new);
+}
+
/* Send a message */
static void send_to_sock(struct connection *con)
{
diff --git a/fs/dlm/lowcomms.h b/fs/dlm/lowcomms.h
index fa735497dad8..345aed7e00cc 100644
--- a/fs/dlm/lowcomms.h
+++ b/fs/dlm/lowcomms.h
@@ -30,6 +30,7 @@ int dlm_lowcomms_nodes_set_mark(int nodeid, unsigned int mark);
int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len);
void dlm_lowcomms_put_buffer(void *mh);
void dlm_lowcomms_get_buffer(void *mh);
+void dlm_lowcomms_resend_buffer(void *mh);
#endif /* __LOWCOMMS_DOT_H__ */
--
2.26.3
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