cifs: change cifs_call_async to use smb_rqst structs

For now, none of the callers populate rq_pages. That will be done for
writes in a later patch. While we're at it, change the prototype of
setup_async_request not to need a return pointer argument. Just
return the pointer to the mid_q_entry or an ERR_PTR.

Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

7 files changed, 85 insertions, 79 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 5ea50dd316c5..a81790005e57 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -201,11 +201,11 @@ struct smb_version_operations {
                            struct mid_q_entry *);
         bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
         /* setup request: allocate mid, sign message */
-        int (*setup_request)(struct cifs_ses *, struct kvec *, unsigned int,
-                             struct mid_q_entry **);
+        struct mid_q_entry *(*setup_request)(struct cifs_ses *,
+                                                struct smb_rqst *);
         /* setup async request: allocate mid, sign message */
-        int (*setup_async_request)(struct TCP_Server_Info *, struct kvec *,
-                                   unsigned int, struct mid_q_entry **);
+        struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
+                                                struct smb_rqst *);
         /* check response: verify signature, map error */
         int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
                              bool);
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index e97a1843ab98..3b628f2af258 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -70,20 +70,20 @@ extern struct mid_q_entry *AllocMidQEntry(const struct smb_hdr *smb_buffer,
 extern void DeleteMidQEntry(struct mid_q_entry *midEntry);
 extern void cifs_delete_mid(struct mid_q_entry *mid);
 extern void cifs_wake_up_task(struct mid_q_entry *mid);
-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,
-                           const int flags);
+extern int cifs_call_async(struct TCP_Server_Info *server,
+                        struct smb_rqst *rqst,
+                        mid_receive_t *receive, mid_callback_t *callback,
+                        void *cbdata, const int flags);
 extern int SendReceive(const unsigned int /* xid */ , struct cifs_ses *,
                         struct smb_hdr * /* input */ ,
                         struct smb_hdr * /* out */ ,
                         int * /* bytes returned */ , const int);
 extern int SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses,
                             char *in_buf, int flags);
-extern int cifs_setup_request(struct cifs_ses *, struct kvec *, unsigned int,
-                              struct mid_q_entry **);
-extern int cifs_setup_async_request(struct TCP_Server_Info *, struct kvec *,
-                                    unsigned int, struct mid_q_entry **);
+extern struct mid_q_entry *cifs_setup_request(struct cifs_ses *,
+                                struct smb_rqst *);
+extern struct mid_q_entry *cifs_setup_async_request(struct TCP_Server_Info *,
+                                                struct smb_rqst *);
 extern int cifs_check_receive(struct mid_q_entry *mid,
                         struct TCP_Server_Info *server, bool log_error);
 extern int SendReceive2(const unsigned int /* xid */ , struct cifs_ses *,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 6786b5ee5326..2f86c84468cb 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -725,6 +725,8 @@ CIFSSMBEcho(struct TCP_Server_Info *server)
         ECHO_REQ *smb;
         int rc = 0;
         struct kvec iov;
+        struct smb_rqst rqst = { .rq_iov = &iov,
+                                 .rq_nvec = 1 };
 
         cFYI(1, "In echo request");
 
@@ -742,7 +744,7 @@ CIFSSMBEcho(struct TCP_Server_Info *server)
         iov.iov_base = smb;
         iov.iov_len = be32_to_cpu(smb->hdr.smb_buf_length) + 4;
 
-        rc = cifs_call_async(server, &iov, 1, NULL, cifs_echo_callback,
+        rc = cifs_call_async(server, &rqst, NULL, cifs_echo_callback,
                              server, CIFS_ASYNC_OP | CIFS_ECHO_OP);
         if (rc)
                 cFYI(1, "Echo request failed: %d", rc);
@@ -1585,6 +1587,8 @@ cifs_async_readv(struct cifs_readdata *rdata)
         READ_REQ *smb = NULL;
         int wct;
         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
+        struct smb_rqst rqst = { .rq_iov = rdata->iov,
+                                 .rq_nvec = 1 };
 
         cFYI(1, "%s: offset=%llu bytes=%u", __func__,
                 rdata->offset, rdata->bytes);
@@ -1628,9 +1632,8 @@ cifs_async_readv(struct cifs_readdata *rdata)
         rdata->iov[0].iov_len = be32_to_cpu(smb->hdr.smb_buf_length) + 4;
 
         kref_get(&rdata->refcount);
-        rc = cifs_call_async(tcon->ses->server, rdata->iov, 1,
-                             cifs_readv_receive, cifs_readv_callback,
-                             rdata, 0);
+        rc = cifs_call_async(tcon->ses->server, &rqst, cifs_readv_receive,
+                             cifs_readv_callback, rdata, 0);
 
         if (rc == 0)
                 cifs_stats_inc(&tcon->stats.cifs_stats.num_reads);
@@ -2035,6 +2038,7 @@ cifs_async_writev(struct cifs_writedata *wdata)
         int wct;
         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
         struct kvec *iov = NULL;
+        struct smb_rqst rqst = { };
 
         if (tcon->ses->capabilities & CAP_LARGE_FILES) {
                 wct = 14;
@@ -2051,11 +2055,13 @@ cifs_async_writev(struct cifs_writedata *wdata)
                 goto async_writev_out;
 
         /* 1 iov per page + 1 for header */
-        iov = kzalloc((wdata->nr_pages + 1) * sizeof(*iov), GFP_NOFS);
+        rqst.rq_nvec = wdata->nr_pages + 1;
+        iov = kzalloc((rqst.rq_nvec) * sizeof(*iov), GFP_NOFS);
         if (iov == NULL) {
                 rc = -ENOMEM;
                 goto async_writev_out;
         }
+        rqst.rq_iov = iov;
 
         smb->hdr.Pid = cpu_to_le16((__u16)wdata->pid);
         smb->hdr.PidHigh = cpu_to_le16((__u16)(wdata->pid >> 16));
@@ -2104,8 +2110,8 @@ 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, 0);
+        rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
+                                cifs_writev_callback, wdata, 0);
 
         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 e188d137cab2..a04301b69b4e 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1171,6 +1171,8 @@ SMB2_echo(struct TCP_Server_Info *server)
         struct smb2_echo_req *req;
         int rc = 0;
         struct kvec iov;
+        struct smb_rqst rqst = { .rq_iov = &iov,
+                                 .rq_nvec = 1 };
 
         cFYI(1, "In echo request");
 
@@ -1184,7 +1186,7 @@ SMB2_echo(struct TCP_Server_Info *server)
         /* 4 for rfc1002 length field */
         iov.iov_len = get_rfc1002_length(req) + 4;
 
-        rc = cifs_call_async(server, &iov, 1, NULL, smb2_echo_callback, server,
+        rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
                              CIFS_ECHO_OP);
         if (rc)
                 cFYI(1, "Echo request failed: %d", rc);
@@ -1344,6 +1346,8 @@ smb2_async_readv(struct cifs_readdata *rdata)
         int rc;
         struct smb2_hdr *buf;
         struct cifs_io_parms io_parms;
+        struct smb_rqst rqst = { .rq_iov = rdata->iov,
+                                 .rq_nvec = 1 };
 
         cFYI(1, "%s: offset=%llu bytes=%u", __func__,
                 rdata->offset, rdata->bytes);
@@ -1363,7 +1367,7 @@ smb2_async_readv(struct cifs_readdata *rdata)
         rdata->iov[0].iov_len = get_rfc1002_length(rdata->iov[0].iov_base) + 4;
 
         kref_get(&rdata->refcount);
-        rc = cifs_call_async(io_parms.tcon->ses->server, rdata->iov, 1,
+        rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
                              cifs_readv_receive, smb2_readv_callback,
                              rdata, 0);
         if (rc)
@@ -1484,6 +1488,7 @@ smb2_async_writev(struct cifs_writedata *wdata)
         struct smb2_write_req *req = NULL;
         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
         struct kvec *iov = NULL;
+        struct smb_rqst rqst;
 
         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
         if (rc)
@@ -1495,6 +1500,8 @@ smb2_async_writev(struct cifs_writedata *wdata)
                 rc = -ENOMEM;
                 goto async_writev_out;
         }
+        rqst.rq_iov = iov;
+        rqst.rq_nvec = wdata->nr_pages + 1;
 
         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
 
@@ -1530,8 +1537,8 @@ smb2_async_writev(struct cifs_writedata *wdata)
         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
 
         kref_get(&wdata->refcount);
-        rc = cifs_call_async(tcon->ses->server, iov, wdata->nr_pages + 1,
-                             NULL, smb2_writev_callback, wdata, 0);
+        rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
+                                smb2_writev_callback, wdata, 0);
 
         if (rc)
                 kref_put(&wdata->refcount, cifs_writedata_release);
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index a9bda043e26e..aeb30dbdf8b8 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -43,11 +43,10 @@ extern __le16 *cifs_convert_path_to_utf16(const char *from,
 extern int smb2_verify_signature(struct smb_rqst *, struct TCP_Server_Info *);
 extern int smb2_check_receive(struct mid_q_entry *mid,
                               struct TCP_Server_Info *server, bool log_error);
-extern int smb2_setup_request(struct cifs_ses *ses, struct kvec *iov,
-                              unsigned int nvec, struct mid_q_entry **ret_mid);
-extern int smb2_setup_async_request(struct TCP_Server_Info *server,
-                                    struct kvec *iov, unsigned int nvec,
-                                    struct mid_q_entry **ret_mid);
+extern struct mid_q_entry *smb2_setup_request(struct cifs_ses *ses,
+                              struct smb_rqst *rqst);
+extern struct mid_q_entry *smb2_setup_async_request(
+                        struct TCP_Server_Info *server, struct smb_rqst *rqst);
 extern void smb2_echo_request(struct work_struct *work);
 extern bool smb2_is_valid_oplock_break(char *buffer,
                                        struct TCP_Server_Info *srv);
diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c
index 9ca4bcfb34c6..2a5fdf26f79f 100644
--- a/fs/cifs/smb2transport.c
+++ b/fs/cifs/smb2transport.c
@@ -281,50 +281,44 @@ smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
         return map_smb2_to_linux_error(mid->resp_buf, log_error);
 }
 
-int
-smb2_setup_request(struct cifs_ses *ses, struct kvec *iov,
-                   unsigned int nvec, struct mid_q_entry **ret_mid)
+struct mid_q_entry *
+smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
 {
         int rc;
-        struct smb2_hdr *hdr = (struct smb2_hdr *)iov[0].iov_base;
+        struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
         struct mid_q_entry *mid;
-        struct smb_rqst rqst = { .rq_iov = iov,
-                                 .rq_nvec = nvec };
 
         smb2_seq_num_into_buf(ses->server, hdr);
 
         rc = smb2_get_mid_entry(ses, hdr, &mid);
         if (rc)
-                return rc;
-        rc = smb2_sign_rqst(&rqst, ses->server);
-        if (rc)
+                return ERR_PTR(rc);
+        rc = smb2_sign_rqst(rqst, ses->server);
+        if (rc) {
                 cifs_delete_mid(mid);
-        *ret_mid = mid;
-        return rc;
+                return ERR_PTR(rc);
+        }
+        return mid;
 }
 
-int
-smb2_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov,
-                         unsigned int nvec, struct mid_q_entry **ret_mid)
+struct mid_q_entry *
+smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
 {
-        int rc = 0;
-        struct smb2_hdr *hdr = (struct smb2_hdr *)iov[0].iov_base;
+        int rc;
+        struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
         struct mid_q_entry *mid;
-        struct smb_rqst rqst = { .rq_iov = iov,
-                                 .rq_nvec = nvec };
 
         smb2_seq_num_into_buf(server, hdr);
 
         mid = smb2_mid_entry_alloc(hdr, server);
         if (mid == NULL)
-                return -ENOMEM;
+                return ERR_PTR(-ENOMEM);
 
-        rc = smb2_sign_rqst(&rqst, server);
+        rc = smb2_sign_rqst(rqst, server);
         if (rc) {
                 DeleteMidQEntry(mid);
-                return rc;
+                return ERR_PTR(rc);
         }
 
-        *ret_mid = mid;
-        return rc;
+        return mid;
 }
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index b6097344cd5b..2126ab185045 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -454,12 +454,11 @@ wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
         return 0;
 }
 
-int
-cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov,
-                         unsigned int nvec, struct mid_q_entry **ret_mid)
+struct mid_q_entry *
+cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
 {
         int rc;
-        struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base;
+        struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
         struct mid_q_entry *mid;
 
         /* enable signing if server requires it */
@@ -468,16 +467,15 @@ cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov,
 
         mid = AllocMidQEntry(hdr, server);
         if (mid == NULL)
-                return -ENOMEM;
+                return ERR_PTR(-ENOMEM);
 
-        rc = cifs_sign_smbv(iov, nvec, server, &mid->sequence_number);
+        rc = cifs_sign_rqst(rqst, server, &mid->sequence_number);
         if (rc) {
                 DeleteMidQEntry(mid);
-                return rc;
+                return ERR_PTR(rc);
         }
 
-        *ret_mid = mid;
-        return 0;
+        return mid;
 }
 
 /*
@@ -485,9 +483,9 @@ cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov,
  * the result. Caller is responsible for dealing with timeouts.
  */
 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, const int flags)
+cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
+                mid_receive_t *receive, mid_callback_t *callback,
+                void *cbdata, const int flags)
 {
         int rc, timeout, optype;
         struct mid_q_entry *mid;
@@ -500,12 +498,12 @@ cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
                 return rc;
 
         mutex_lock(&server->srv_mutex);
-        rc = server->ops->setup_async_request(server, iov, nvec, &mid);
-        if (rc) {
+        mid = server->ops->setup_async_request(server, rqst);
+        if (IS_ERR(mid)) {
                 mutex_unlock(&server->srv_mutex);
                 add_credits(server, 1, optype);
                 wake_up(&server->request_q);
-                return rc;
+                return PTR_ERR(mid);
         }
 
         mid->receive = receive;
@@ -520,7 +518,7 @@ cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
 
 
         cifs_in_send_inc(server);
-        rc = smb_sendv(server, iov, nvec);
+        rc = smb_send_rqst(server, rqst);
         cifs_in_send_dec(server);
         cifs_save_when_sent(mid);
         mutex_unlock(&server->srv_mutex);
@@ -630,22 +628,22 @@ cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
         return map_smb_to_linux_error(mid->resp_buf, log_error);
 }
 
-int
-cifs_setup_request(struct cifs_ses *ses, struct kvec *iov,
-                   unsigned int nvec, struct mid_q_entry **ret_mid)
+struct mid_q_entry *
+cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
 {
         int rc;
-        struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base;
+        struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
         struct mid_q_entry *mid;
 
         rc = allocate_mid(ses, hdr, &mid);
         if (rc)
-                return rc;
-        rc = cifs_sign_smbv(iov, nvec, ses->server, &mid->sequence_number);
-        if (rc)
+                return ERR_PTR(rc);
+        rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number);
+        if (rc) {
                 cifs_delete_mid(mid);
-        *ret_mid = mid;
-        return rc;
+                return ERR_PTR(rc);
+        }
+        return mid;
 }
 
 int
@@ -658,6 +656,8 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
         struct mid_q_entry *midQ;
         char *buf = iov[0].iov_base;
         unsigned int credits = 1;
+        struct smb_rqst rqst = { .rq_iov = iov,
+                                 .rq_nvec = n_vec };
 
         timeout = flags & CIFS_TIMEOUT_MASK;
         optype = flags & CIFS_OP_MASK;
@@ -695,13 +695,13 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
 
         mutex_lock(&ses->server->srv_mutex);
 
-        rc = ses->server->ops->setup_request(ses, iov, n_vec, &midQ);
-        if (rc) {
+        midQ = ses->server->ops->setup_request(ses, &rqst);
+        if (IS_ERR(midQ)) {
                 mutex_unlock(&ses->server->srv_mutex);
                 cifs_small_buf_release(buf);
                 /* Update # of requests on wire to server */
                 add_credits(ses->server, 1, optype);
-                return rc;
+                return PTR_ERR(midQ);
         }
 
         midQ->mid_state = MID_REQUEST_SUBMITTED;