The reconnect might have happended after we obtained credits
and before we acquired srv_mutex. Check for that under the mutex
and retry an async operation if the reconnect is detected.
Signed-off-by: Pavel Shilovsky <pshilov@xxxxxxxxxxxxx>
---
fs/cifs/cifsproto.h | 3 ++-
fs/cifs/cifssmb.c | 6 +++---
fs/cifs/smb2pdu.c | 7 ++++---
fs/cifs/transport.c | 18 ++++++++++++++++--
4 files changed, 25 insertions(+), 9 deletions(-)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 7a9a9fd..9e8394f 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -93,7 +93,8 @@ extern int cifs_discard_remaining_data(struct TCP_Server_Info *server);
extern int cifs_call_async(struct TCP_Server_Info *server,
struct smb_rqst *rqst,
mid_receive_t *receive, mid_callback_t *callback,
- mid_handle_t *handle, void *cbdata, const int flags);
+ mid_handle_t *handle, void *cbdata, const int flags,
+ const struct cifs_credits *exist_credits);
extern int cifs_send_recv(const unsigned int xid, struct cifs_ses *ses,
struct smb_rqst *rqst, int *resp_buf_type,
const int flags, struct kvec *resp_iov);
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 5b54882..8f44415 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -851,7 +851,7 @@ CIFSSMBEcho(struct TCP_Server_Info *server)
iov[1].iov_base = (char *)smb + 4;
rc = cifs_call_async(server, &rqst, NULL, cifs_echo_callback, NULL,
- server, CIFS_ASYNC_OP | CIFS_ECHO_OP);
+ server, CIFS_ASYNC_OP | CIFS_ECHO_OP, NULL);
if (rc)
cifs_dbg(FYI, "Echo request failed: %d\n", rc);
@@ -1803,7 +1803,7 @@ cifs_async_readv(struct cifs_readdata *rdata)
kref_get(&rdata->refcount);
rc = cifs_call_async(tcon->ses->server, &rqst, cifs_readv_receive,
- cifs_readv_callback, NULL, rdata, 0);
+ cifs_readv_callback, NULL, rdata, 0, NULL);
if (rc == 0)
cifs_stats_inc(&tcon->stats.cifs_stats.num_reads);
@@ -2334,7 +2334,7 @@ cifs_async_writev(struct cifs_writedata *wdata,
kref_get(&wdata->refcount);
rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
- cifs_writev_callback, NULL, wdata, 0);
+ cifs_writev_callback, NULL, wdata, 0, NULL);
if (rc == 0)
cifs_stats_inc(&tcon->stats.cifs_stats.num_writes);
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 2a2ebaa..8d3a96d 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2994,7 +2994,7 @@ SMB2_echo(struct TCP_Server_Info *server)
iov[0].iov_base = (char *)req;
rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
- server, CIFS_ECHO_OP);
+ server, CIFS_ECHO_OP, NULL);
if (rc)
cifs_dbg(FYI, "Echo request failed: %d\n", rc);
@@ -3294,7 +3294,8 @@ smb2_async_readv(struct cifs_readdata *rdata)
kref_get(&rdata->refcount);
rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
cifs_readv_receive, smb2_readv_callback,
- smb3_handle_read_data, rdata, flags);
+ smb3_handle_read_data, rdata, flags,
+ &rdata->credits);
if (rc) {
kref_put(&rdata->refcount, cifs_readdata_release);
cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
@@ -3587,7 +3588,7 @@ smb2_async_writev(struct cifs_writedata *wdata,
kref_get(&wdata->refcount);
rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
- wdata, flags);
+ wdata, flags, &wdata->credits);
if (rc) {
trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 8b512a9..26e9912 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -634,7 +634,8 @@ cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
int
cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
mid_receive_t *receive, mid_callback_t *callback,
- mid_handle_t *handle, void *cbdata, const int flags)
+ mid_handle_t *handle, void *cbdata, const int flags,
+ const struct cifs_credits *exist_credits)
{
int rc, timeout, optype;
struct mid_q_entry *mid;
@@ -650,9 +651,22 @@ cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
return rc;
credits.value = 1;
credits.instance = instance;
- }
+ } else
+ instance = exist_credits->instance;
mutex_lock(&server->srv_mutex);
+
+ /*
+ * We can't use credits obtained from the previous session to send this
+ * request. Check if there were reconnects after we obtained credits and
+ * return -EAGAIN in such cases to let callers handle it.
+ */
+ if (instance != server->reconnect_instance) {
+ mutex_unlock(&server->srv_mutex);
+ add_credits_and_wake_if(server, &credits, optype);
+ return -EAGAIN;
+ }
+
mid = server->ops->setup_async_request(server, rqst);
if (IS_ERR(mid)) {
mutex_unlock(&server->srv_mutex);
--
2.7.4
