Split all requests to echos, oplocks and others - each group uses
its own credit slot. This is indicated by new flags
CIFS_ECHO_OP and CIFS_OBREAK_OP
that are not used now for CIFS. This change is required to support
SMB2 protocol because of different processing of these commands.
Signed-off-by: Pavel Shilovsky <pshilovsky@xxxxxxxxx>
---
fs/cifs/cifsglob.h | 16 +++++++++++---
fs/cifs/cifsproto.h | 2 +-
fs/cifs/cifssmb.c | 21 ++++++++++---------
fs/cifs/smb1ops.c | 12 +++++++++-
fs/cifs/transport.c | 54 +++++++++++++++++++++++++++++---------------------
5 files changed, 65 insertions(+), 40 deletions(-)
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 2aac4e5..844b77c 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -171,9 +171,11 @@ struct smb_version_operations {
/* check response: verify signature, map error */
int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
bool);
- void (*add_credits)(struct TCP_Server_Info *, const unsigned int);
+ void (*add_credits)(struct TCP_Server_Info *, const unsigned int,
+ const int);
void (*set_credits)(struct TCP_Server_Info *, const int);
- int * (*get_credits_field)(struct TCP_Server_Info *);
+ int * (*get_credits_field)(struct TCP_Server_Info *, const int);
+ unsigned int (*get_credits)(struct mid_q_entry *);
__u64 (*get_next_mid)(struct TCP_Server_Info *);
/* data offset from read response message */
unsigned int (*read_data_offset)(char *);
@@ -392,9 +394,10 @@ has_credits(struct TCP_Server_Info *server, int *credits)
}
static inline void
-add_credits(struct TCP_Server_Info *server, const unsigned int add)
+add_credits(struct TCP_Server_Info *server, const unsigned int add,
+ const int optype)
{
- server->ops->add_credits(server, add);
+ server->ops->add_credits(server, add, optype);
}
static inline void
@@ -957,6 +960,11 @@ static inline void free_dfs_info_array(struct dfs_info3_param *param,
#define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
#define CIFS_NO_RESP 0x040 /* no response buffer required */
+/* Type of request operation */
+#define CIFS_ECHO_OP 0x080 /* echo request */
+#define CIFS_OBREAK_OP 0x0100 /* oplock break request */
+#define CIFS_OP_MASK 0x0180 /* mask request type */
+
/* Security Flags: indicate type of session setup needed */
#define CIFSSEC_MAY_SIGN 0x00001
#define CIFSSEC_MAY_NTLM 0x00002
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 0a6cbfe..8c1c7c1 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -71,7 +71,7 @@ extern void DeleteMidQEntry(struct mid_q_entry *midEntry);
extern int cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
unsigned int nvec, mid_receive_t *receive,
mid_callback_t *callback, void *cbdata,
- bool ignore_pend);
+ const int flags);
extern int SendReceive(const unsigned int /* xid */ , struct cifs_ses *,
struct smb_hdr * /* input */ ,
struct smb_hdr * /* out */ ,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 5b40073..58f1ab5 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -720,7 +720,7 @@ cifs_echo_callback(struct mid_q_entry *mid)
struct TCP_Server_Info *server = mid->callback_data;
DeleteMidQEntry(mid);
- add_credits(server, 1);
+ add_credits(server, 1, CIFS_ECHO_OP);
}
int
@@ -747,7 +747,7 @@ CIFSSMBEcho(struct TCP_Server_Info *server)
iov.iov_len = be32_to_cpu(smb->hdr.smb_buf_length) + 4;
rc = cifs_call_async(server, &iov, 1, NULL, cifs_echo_callback,
- server, true);
+ server, CIFS_ASYNC_OP | CIFS_ECHO_OP);
if (rc)
cFYI(1, "Echo request failed: %d", rc);
@@ -1563,7 +1563,7 @@ cifs_readv_callback(struct mid_q_entry *mid)
queue_work(cifsiod_wq, &rdata->work);
DeleteMidQEntry(mid);
- add_credits(server, 1);
+ add_credits(server, 1, 0);
}
/* cifs_async_readv - send an async write, and set up mid to handle result */
@@ -1619,7 +1619,7 @@ cifs_async_readv(struct cifs_readdata *rdata)
kref_get(&rdata->refcount);
rc = cifs_call_async(tcon->ses->server, rdata->iov, 1,
cifs_readv_receive, cifs_readv_callback,
- rdata, false);
+ rdata, 0);
if (rc == 0)
cifs_stats_inc(&tcon->num_reads);
@@ -2010,7 +2010,7 @@ cifs_writev_callback(struct mid_q_entry *mid)
queue_work(cifsiod_wq, &wdata->work);
DeleteMidQEntry(mid);
- add_credits(tcon->ses->server, 1);
+ add_credits(tcon->ses->server, 1, 0);
}
/* cifs_async_writev - send an async write, and set up mid to handle result */
@@ -2090,7 +2090,7 @@ cifs_async_writev(struct cifs_writedata *wdata)
kref_get(&wdata->refcount);
rc = cifs_call_async(tcon->ses->server, iov, wdata->nr_pages + 1,
- NULL, cifs_writev_callback, wdata, false);
+ NULL, cifs_writev_callback, wdata, 0);
if (rc == 0)
cifs_stats_inc(&tcon->num_writes);
@@ -2268,7 +2268,7 @@ CIFSSMBLock(const int xid, struct cifs_tcon *tcon,
LOCK_REQ *pSMB = NULL;
/* LOCK_RSP *pSMBr = NULL; */ /* No response data other than rc to parse */
int bytes_returned;
- int timeout = 0;
+ int flags = 0;
__u16 count;
cFYI(1, "CIFSSMBLock timeout %d numLock %d", (int)waitFlag, numLock);
@@ -2278,10 +2278,11 @@ CIFSSMBLock(const int xid, struct cifs_tcon *tcon,
return rc;
if (lockType == LOCKING_ANDX_OPLOCK_RELEASE) {
- timeout = CIFS_ASYNC_OP; /* no response expected */
+ /* no response expected */
+ flags = CIFS_ASYNC_OP | CIFS_OBREAK_OP;
pSMB->Timeout = 0;
} else if (waitFlag) {
- timeout = CIFS_BLOCKING_OP; /* blocking operation, no timeout */
+ flags = CIFS_BLOCKING_OP; /* blocking operation, no timeout */
pSMB->Timeout = cpu_to_le32(-1);/* blocking - do not time out */
} else {
pSMB->Timeout = 0;
@@ -2314,7 +2315,7 @@ CIFSSMBLock(const int xid, struct cifs_tcon *tcon,
(struct smb_hdr *) pSMB, &bytes_returned);
cifs_small_buf_release(pSMB);
} else {
- rc = SendReceiveNoRsp(xid, tcon->ses, (char *)pSMB, timeout);
+ rc = SendReceiveNoRsp(xid, tcon->ses, (char *)pSMB, flags);
/* SMB buffer freed by function above */
}
cifs_stats_inc(&tcon->num_locks);
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 28359e7..f4f8394 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -101,7 +101,8 @@ cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
}
static void
-cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add)
+cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
+ const int optype)
{
spin_lock(&server->req_lock);
server->credits += add;
@@ -120,11 +121,17 @@ cifs_set_credits(struct TCP_Server_Info *server, const int val)
}
static int *
-cifs_get_credits_field(struct TCP_Server_Info *server)
+cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
{
return &server->credits;
}
+static unsigned int
+cifs_get_credits(struct mid_q_entry *mid)
+{
+ return 1;
+}
+
/*
* Find a free multiplex id (SMB mid). Otherwise there could be
* mid collisions which might cause problems, demultiplexing the
@@ -390,6 +397,7 @@ struct smb_version_operations smb1_operations = {
.add_credits = cifs_add_credits,
.set_credits = cifs_set_credits,
.get_credits_field = cifs_get_credits_field,
+ .get_credits = cifs_get_credits,
.get_next_mid = cifs_get_next_mid,
.read_data_offset = cifs_read_data_offset,
.read_data_length = cifs_read_data_length,
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 3097ee5..54cd8dd 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -254,13 +254,13 @@ smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
}
static int
-wait_for_free_credits(struct TCP_Server_Info *server, const int optype,
+wait_for_free_credits(struct TCP_Server_Info *server, const int long_op,
int *credits)
{
int rc;
spin_lock(&server->req_lock);
- if (optype == CIFS_ASYNC_OP) {
+ if (long_op == CIFS_ASYNC_OP) {
/* oplock breaks must not be held up */
server->in_flight++;
*credits -= 1;
@@ -290,7 +290,7 @@ wait_for_free_credits(struct TCP_Server_Info *server, const int optype,
*/
/* update # of requests on the wire to server */
- if (optype != CIFS_BLOCKING_OP) {
+ if (long_op != CIFS_BLOCKING_OP) {
*credits -= 1;
server->in_flight++;
}
@@ -302,10 +302,11 @@ wait_for_free_credits(struct TCP_Server_Info *server, const int optype,
}
static int
-wait_for_free_request(struct TCP_Server_Info *server, const int optype)
+wait_for_free_request(struct TCP_Server_Info *server, const int long_op,
+ const int optype)
{
- return wait_for_free_credits(server, optype,
- server->ops->get_credits_field(server));
+ return wait_for_free_credits(server, long_op,
+ server->ops->get_credits_field(server, optype));
}
static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf,
@@ -384,12 +385,15 @@ cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov,
int
cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
unsigned int nvec, mid_receive_t *receive,
- mid_callback_t *callback, void *cbdata, bool ignore_pend)
+ mid_callback_t *callback, void *cbdata, const int flags)
{
- int rc;
+ int rc, long_op, optype;
struct mid_q_entry *mid;
- rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0);
+ long_op = flags & CIFS_TIMEOUT_MASK;
+ optype = flags & CIFS_OP_MASK;
+
+ rc = wait_for_free_request(server, long_op, optype);
if (rc)
return rc;
@@ -397,7 +401,7 @@ cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
rc = cifs_setup_async_request(server, iov, nvec, &mid);
if (rc) {
mutex_unlock(&server->srv_mutex);
- add_credits(server, 1);
+ add_credits(server, 1, optype);
wake_up(&server->request_q);
return rc;
}
@@ -419,7 +423,7 @@ cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
return rc;
out_err:
delete_mid(mid);
- add_credits(server, 1);
+ add_credits(server, 1, optype);
wake_up(&server->request_q);
return rc;
}
@@ -539,11 +543,13 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
const int flags)
{
int rc = 0;
- int long_op;
+ int long_op, optype;
struct mid_q_entry *midQ;
char *buf = iov[0].iov_base;
+ unsigned int credits = 1;
long_op = flags & CIFS_TIMEOUT_MASK;
+ optype = flags & CIFS_OP_MASK;
*pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */
@@ -564,7 +570,7 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
* use ses->maxReq.
*/
- rc = wait_for_free_request(ses->server, long_op);
+ rc = wait_for_free_request(ses->server, optype, long_op);
if (rc) {
cifs_small_buf_release(buf);
return rc;
@@ -583,7 +589,7 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
mutex_unlock(&ses->server->srv_mutex);
cifs_small_buf_release(buf);
/* Update # of requests on wire to server */
- add_credits(ses->server, 1);
+ add_credits(ses->server, 1, optype);
return rc;
}
@@ -613,7 +619,7 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
midQ->callback = DeleteMidQEntry;
spin_unlock(&GlobalMid_Lock);
cifs_small_buf_release(buf);
- add_credits(ses->server, 1);
+ add_credits(ses->server, 1, optype);
return rc;
}
spin_unlock(&GlobalMid_Lock);
@@ -623,7 +629,7 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
rc = cifs_sync_mid_result(midQ, ses->server);
if (rc != 0) {
- add_credits(ses->server, 1);
+ add_credits(ses->server, 1, optype);
return rc;
}
@@ -641,6 +647,8 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
else
*pRespBufType = CIFS_SMALL_BUFFER;
+ credits = ses->server->ops->get_credits(midQ);
+
rc = ses->server->ops->check_receive(midQ, ses->server,
flags & CIFS_LOG_ERROR);
@@ -649,7 +657,7 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
midQ->resp_buf = NULL;
out:
delete_mid(midQ);
- add_credits(ses->server, 1);
+ add_credits(ses->server, credits, optype);
return rc;
}
@@ -685,7 +693,7 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,
return -EIO;
}
- rc = wait_for_free_request(ses->server, long_op);
+ rc = wait_for_free_request(ses->server, 0, long_op);
if (rc)
return rc;
@@ -699,7 +707,7 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,
if (rc) {
mutex_unlock(&ses->server->srv_mutex);
/* Update # of requests on wire to server */
- add_credits(ses->server, 1);
+ add_credits(ses->server, 1, 0);
return rc;
}
@@ -731,7 +739,7 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,
/* no longer considered to be "in-flight" */
midQ->callback = DeleteMidQEntry;
spin_unlock(&GlobalMid_Lock);
- add_credits(ses->server, 1);
+ add_credits(ses->server, 1, 0);
return rc;
}
spin_unlock(&GlobalMid_Lock);
@@ -739,7 +747,7 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,
rc = cifs_sync_mid_result(midQ, ses->server);
if (rc != 0) {
- add_credits(ses->server, 1);
+ add_credits(ses->server, 1, 0);
return rc;
}
@@ -755,7 +763,7 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,
rc = cifs_check_receive(midQ, ses->server, 0);
out:
delete_mid(midQ);
- add_credits(ses->server, 1);
+ add_credits(ses->server, 1, 0);
return rc;
}
@@ -820,7 +828,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon,
return -EIO;
}
- rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP);
+ rc = wait_for_free_request(ses->server, 0, CIFS_BLOCKING_OP);
if (rc)
return rc;
--
1.7.1
--
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