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smbd: Make upper layer decide when to destroy the transport

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On transport recoonect, upper layer CIFS code destroys the current
transport and then recoonect. This code path is not used by SMBD, in that
SMBD destroys its transport on RDMA disconnect notification independent of
CIFS upper layer behavior.

This approach adds some costs to SMBD layer to handle transport shutdown
and restart, and to deal with several racing conditions on reconnecting
transport.

Re-work this code path by introducing a new smbd_destroy. This function is
called form upper layer to ask SMBD to destroy the transport. SMBD will no
longer need to destroy the transport by itself while worrying about data
transfer is in progress. The upper layer guarantees the transport is
locked.

change log:
v2: fix build errors when CONFIG_CIFS_SMB_DIRECT is not configured

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Long Li
2019-04-04 11:35:42 -05:00
committed by Steve French
parent 973189aba6
commit 050b8c3740
3 changed files with 101 additions and 27 deletions
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5
fs/cifs/smbdirect.h
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@@ -71,6 +71,7 @@ struct smbd_connection {
struct completion ri_done;
wait_queue_head_t conn_wait;
wait_queue_head_t wait_destroy;
wait_queue_head_t disconn_wait;
struct completion negotiate_completion;
bool negotiate_done;
@@ -288,7 +289,7 @@ struct smbd_connection *smbd_get_connection(
/* Reconnect SMBDirect session */
int smbd_reconnect(struct TCP_Server_Info *server);
/* Destroy SMBDirect session */
void smbd_destroy(struct smbd_connection *info);
void smbd_destroy(struct TCP_Server_Info *server);
/* Interface for carrying upper layer I/O through send/recv */
int smbd_recv(struct smbd_connection *info, struct msghdr *msg);
@@ -330,7 +331,7 @@ struct smbd_connection {};
static inline void *smbd_get_connection(
struct TCP_Server_Info *server, struct sockaddr *dstaddr) {return NULL;}
static inline int smbd_reconnect(struct TCP_Server_Info *server) {return -1; }
static inline void smbd_destroy(struct smbd_connection *info) {}
static inline void smbd_destroy(struct TCP_Server_Info *server) {}
static inline int smbd_recv(struct smbd_connection *info, struct msghdr *msg) {return -1; }
static inline int smbd_send(struct TCP_Server_Info *server, struct smb_rqst *rqst) {return -1; }
#endif