/* * Send a SMB request and set the callback function in the mid to handle * the result. Caller is responsible for dealing with timeouts. */ 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) { int rc, timeout, optype; struct mid_q_entry *mid; unsigned int credits = 0; timeout = flags & CIFS_TIMEOUT_MASK; optype = flags & CIFS_OP_MASK; if ((flags & CIFS_HAS_CREDITS) == 0) { rc = wait_for_free_request(server, timeout, optype); if (rc) return rc; credits = 1; } mutex_lock(&server->srv_mutex); mid = server->ops->setup_async_request(server, rqst); if (IS_ERR(mid)) { mutex_unlock(&server->srv_mutex); add_credits_and_wake_if(server, credits, optype); return PTR_ERR(mid); } mid->receive = receive; mid->callback = callback; mid->callback_data = cbdata; mid->handle = handle; mid->mid_state = MID_REQUEST_SUBMITTED; /* put it on the pending_mid_q */ spin_lock(&GlobalMid_Lock); list_add_tail(&mid->qhead, &server->pending_mid_q); spin_unlock(&GlobalMid_Lock); /* * Need to store the time in mid before calling I/O. For call_async, * I/O response may come back and free the mid entry on another thread. */ cifs_save_when_sent(mid); cifs_in_send_inc(server); rc = smb_send_rqst(server, 1, rqst, flags); cifs_in_send_dec(server); if (rc < 0) { server->sequence_number -= 2; cifs_delete_mid(mid); } mutex_unlock(&server->srv_mutex); if (rc == 0) return 0; add_credits_and_wake_if(server, credits, optype); return rc; }
static int smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) { struct smb_rqst rqst = { .rq_iov = iov, .rq_nvec = n_vec }; return smb_send_rqst(server, &rqst); }
/* * Send a SMB request and set the callback function in the mid to handle * the result. Caller is responsible for dealing with timeouts. */ 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) { int rc, timeout, optype; struct mid_q_entry *mid; timeout = flags & CIFS_TIMEOUT_MASK; optype = flags & CIFS_OP_MASK; rc = wait_for_free_request(server, timeout, optype); if (rc) return rc; mutex_lock(&server->srv_mutex); 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 PTR_ERR(mid); } mid->receive = receive; mid->callback = callback; mid->callback_data = cbdata; mid->mid_state = MID_REQUEST_SUBMITTED; /* put it on the pending_mid_q */ spin_lock(&GlobalMid_Lock); list_add_tail(&mid->qhead, &server->pending_mid_q); spin_unlock(&GlobalMid_Lock); cifs_in_send_inc(server); rc = smb_send_rqst(server, rqst); cifs_in_send_dec(server); cifs_save_when_sent(mid); if (rc < 0) { server->sequence_number -= 2; cifs_delete_mid(mid); } mutex_unlock(&server->srv_mutex); if (rc == 0) return 0; add_credits(server, 1, optype); wake_up(&server->request_q); return rc; }
/* * Send a SMB request and set the callback function in the mid to handle * the result. Caller is responsible for dealing with timeouts. */ 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, const struct cifs_credits *exist_credits) { int rc; struct mid_q_entry *mid; struct cifs_credits credits = { .value = 0, .instance = 0 }; unsigned int instance; int optype; optype = flags & CIFS_OP_MASK; if ((flags & CIFS_HAS_CREDITS) == 0) { rc = wait_for_free_request(server, flags, &instance); if (rc) 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); add_credits_and_wake_if(server, &credits, optype); return PTR_ERR(mid); } mid->receive = receive; mid->callback = callback; mid->callback_data = cbdata; mid->handle = handle; mid->mid_state = MID_REQUEST_SUBMITTED; /* put it on the pending_mid_q */ spin_lock(&GlobalMid_Lock); list_add_tail(&mid->qhead, &server->pending_mid_q); spin_unlock(&GlobalMid_Lock); /* * Need to store the time in mid before calling I/O. For call_async, * I/O response may come back and free the mid entry on another thread. */ cifs_save_when_sent(mid); cifs_in_send_inc(server); rc = smb_send_rqst(server, 1, rqst, flags); cifs_in_send_dec(server); if (rc < 0) { revert_current_mid(server, mid->credits); server->sequence_number -= 2; cifs_delete_mid(mid); } mutex_unlock(&server->srv_mutex); if (rc == 0) return 0; add_credits_and_wake_if(server, &credits, optype); return rc; } /* * * Send an SMB Request. No response info (other than return code) * needs to be parsed. * * flags indicate the type of request buffer and how long to wait * and whether to log NT STATUS code (error) before mapping it to POSIX error * */ int SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, char *in_buf, int flags) { int rc; struct kvec iov[1]; struct kvec rsp_iov; int resp_buf_type; iov[0].iov_base = in_buf; iov[0].iov_len = get_rfc1002_length(in_buf) + 4; flags |= CIFS_NO_RSP_BUF; rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); return rc; }
int compound_send_recv(const unsigned int xid, struct cifs_ses *ses, const int flags, const int num_rqst, struct smb_rqst *rqst, int *resp_buf_type, struct kvec *resp_iov) { int i, j, rc = 0; int timeout, optype; struct mid_q_entry *midQ[MAX_COMPOUND]; bool cancelled_mid[MAX_COMPOUND] = {false}; unsigned int credits[MAX_COMPOUND] = {0}; char *buf; timeout = flags & CIFS_TIMEOUT_MASK; optype = flags & CIFS_OP_MASK; for (i = 0; i < num_rqst; i++) resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ if ((ses == NULL) || (ses->server == NULL)) { cifs_dbg(VFS, "Null session\n"); return -EIO; } if (ses->server->tcpStatus == CifsExiting) return -ENOENT; /* * Ensure we obtain 1 credit per request in the compound chain. * It can be optimized further by waiting for all the credits * at once but this can wait long enough if we don't have enough * credits due to some heavy operations in progress or the server * not granting us much, so a fallback to the current approach is * needed anyway. */ for (i = 0; i < num_rqst; i++) { rc = wait_for_free_request(ses->server, timeout, optype); if (rc) { /* * We haven't sent an SMB packet to the server yet but * we already obtained credits for i requests in the * compound chain - need to return those credits back * for future use. Note that we need to call add_credits * multiple times to match the way we obtained credits * in the first place and to account for in flight * requests correctly. */ for (j = 0; j < i; j++) add_credits(ses->server, 1, optype); return rc; } credits[i] = 1; } /* * Make sure that we sign in the same order that we send on this socket * and avoid races inside tcp sendmsg code that could cause corruption * of smb data. */ mutex_lock(&ses->server->srv_mutex); for (i = 0; i < num_rqst; i++) { midQ[i] = ses->server->ops->setup_request(ses, &rqst[i]); if (IS_ERR(midQ[i])) { for (j = 0; j < i; j++) cifs_delete_mid(midQ[j]); mutex_unlock(&ses->server->srv_mutex); /* Update # of requests on wire to server */ for (j = 0; j < num_rqst; j++) add_credits(ses->server, credits[j], optype); return PTR_ERR(midQ[i]); } midQ[i]->mid_state = MID_REQUEST_SUBMITTED; midQ[i]->optype = optype; /* * Invoke callback for every part of the compound chain * to calculate credits properly. Wake up this thread only when * the last element is received. */ if (i < num_rqst - 1) midQ[i]->callback = cifs_compound_callback; else midQ[i]->callback = cifs_compound_last_callback; } cifs_in_send_inc(ses->server); rc = smb_send_rqst(ses->server, num_rqst, rqst, flags); cifs_in_send_dec(ses->server); for (i = 0; i < num_rqst; i++) cifs_save_when_sent(midQ[i]); if (rc < 0) ses->server->sequence_number -= 2; mutex_unlock(&ses->server->srv_mutex); if (rc < 0) { /* Sending failed for some reason - return credits back */ for (i = 0; i < num_rqst; i++) add_credits(ses->server, credits[i], optype); goto out; } /* * At this point the request is passed to the network stack - we assume * that any credits taken from the server structure on the client have * been spent and we can't return them back. Once we receive responses * we will collect credits granted by the server in the mid callbacks * and add those credits to the server structure. */ /* * Compounding is never used during session establish. */ if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) smb311_update_preauth_hash(ses, rqst[0].rq_iov, rqst[0].rq_nvec); if (timeout == CIFS_ASYNC_OP) goto out; for (i = 0; i < num_rqst; i++) { rc = wait_for_response(ses->server, midQ[i]); if (rc != 0) break; } if (rc != 0) { for (; i < num_rqst; i++) { cifs_dbg(VFS, "Cancelling wait for mid %llu cmd: %d\n", midQ[i]->mid, le16_to_cpu(midQ[i]->command)); send_cancel(ses->server, &rqst[i], midQ[i]); spin_lock(&GlobalMid_Lock); if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { midQ[i]->mid_flags |= MID_WAIT_CANCELLED; midQ[i]->callback = cifs_cancelled_callback; cancelled_mid[i] = true; credits[i] = 0; } spin_unlock(&GlobalMid_Lock); } } for (i = 0; i < num_rqst; i++) { if (rc < 0) goto out; rc = cifs_sync_mid_result(midQ[i], ses->server); if (rc != 0) { /* mark this mid as cancelled to not free it below */ cancelled_mid[i] = true; goto out; } if (!midQ[i]->resp_buf || midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { rc = -EIO; cifs_dbg(FYI, "Bad MID state?\n"); goto out; } buf = (char *)midQ[i]->resp_buf; resp_iov[i].iov_base = buf; resp_iov[i].iov_len = midQ[i]->resp_buf_size + ses->server->vals->header_preamble_size; if (midQ[i]->large_buf) resp_buf_type[i] = CIFS_LARGE_BUFFER; else resp_buf_type[i] = CIFS_SMALL_BUFFER; rc = ses->server->ops->check_receive(midQ[i], ses->server, flags & CIFS_LOG_ERROR); /* mark it so buf will not be freed by cifs_delete_mid */ if ((flags & CIFS_NO_RESP) == 0) midQ[i]->resp_buf = NULL; } /* * Compounding is never used during session establish. */ if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { struct kvec iov = { .iov_base = resp_iov[0].iov_base, .iov_len = resp_iov[0].iov_len }; smb311_update_preauth_hash(ses, &iov, 1); } out: /* * This will dequeue all mids. After this it is important that the * demultiplex_thread will not process any of these mids any futher. * This is prevented above by using a noop callback that will not * wake this thread except for the very last PDU. */ for (i = 0; i < num_rqst; i++) { if (!cancelled_mid[i]) cifs_delete_mid(midQ[i]); } return rc; } 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) { return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type, resp_iov); } int SendReceive2(const unsigned int xid, struct cifs_ses *ses, struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, const int flags, struct kvec *resp_iov) { struct smb_rqst rqst; struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; int rc; if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), GFP_KERNEL); if (!new_iov) { /* otherwise cifs_send_recv below sets resp_buf_type */ *resp_buf_type = CIFS_NO_BUFFER; return -ENOMEM; } } else new_iov = s_iov; /* 1st iov is a RFC1001 length followed by the rest of the packet */ memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); new_iov[0].iov_base = new_iov[1].iov_base; new_iov[0].iov_len = 4; new_iov[1].iov_base += 4; new_iov[1].iov_len -= 4; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = new_iov; rqst.rq_nvec = n_vec + 1; rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); if (n_vec + 1 > CIFS_MAX_IOV_SIZE) kfree(new_iov); return rc; } int SendReceive(const unsigned int xid, struct cifs_ses *ses, struct smb_hdr *in_buf, struct smb_hdr *out_buf, int *pbytes_returned, const int timeout) { int rc = 0; struct mid_q_entry *midQ; unsigned int len = be32_to_cpu(in_buf->smb_buf_length); struct kvec iov = { .iov_base = in_buf, .iov_len = len }; struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; if (ses == NULL) { cifs_dbg(VFS, "Null smb session\n"); return -EIO; } if (ses->server == NULL) { cifs_dbg(VFS, "Null tcp session\n"); return -EIO; } if (ses->server->tcpStatus == CifsExiting) return -ENOENT; /* Ensure that we do not send more than 50 overlapping requests to the same server. We may make this configurable later or use ses->maxReq */ if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", len); return -EIO; } rc = wait_for_free_request(ses->server, timeout, 0); if (rc) return rc; /* make sure that we sign in the same order that we send on this socket and avoid races inside tcp sendmsg code that could cause corruption of smb data */ mutex_lock(&ses->server->srv_mutex); rc = allocate_mid(ses, in_buf, &midQ); if (rc) { mutex_unlock(&ses->server->srv_mutex); /* Update # of requests on wire to server */ add_credits(ses->server, 1, 0); return rc; } rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); if (rc) { mutex_unlock(&ses->server->srv_mutex); goto out; } midQ->mid_state = MID_REQUEST_SUBMITTED; cifs_in_send_inc(ses->server); rc = smb_send(ses->server, in_buf, len); cifs_in_send_dec(ses->server); cifs_save_when_sent(midQ); if (rc < 0) ses->server->sequence_number -= 2; mutex_unlock(&ses->server->srv_mutex); if (rc < 0) goto out; if (timeout == CIFS_ASYNC_OP) goto out; rc = wait_for_response(ses->server, midQ); if (rc != 0) { send_cancel(ses->server, &rqst, midQ); spin_lock(&GlobalMid_Lock); if (midQ->mid_state == MID_REQUEST_SUBMITTED) { /* no longer considered to be "in-flight" */ midQ->callback = DeleteMidQEntry; spin_unlock(&GlobalMid_Lock); add_credits(ses->server, 1, 0); return rc; } spin_unlock(&GlobalMid_Lock); } rc = cifs_sync_mid_result(midQ, ses->server); if (rc != 0) { add_credits(ses->server, 1, 0); return rc; } if (!midQ->resp_buf || !out_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { rc = -EIO; cifs_dbg(VFS, "Bad MID state?\n"); goto out; } *pbytes_returned = get_rfc1002_length(midQ->resp_buf); memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); rc = cifs_check_receive(midQ, ses->server, 0); out: cifs_delete_mid(midQ); add_credits(ses->server, 1, 0); return rc; } /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows blocking lock to return. */ static int send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, struct smb_hdr *in_buf, struct smb_hdr *out_buf) { int bytes_returned; struct cifs_ses *ses = tcon->ses; LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; /* We just modify the current in_buf to change the type of lock from LOCKING_ANDX_SHARED_LOCK or LOCKING_ANDX_EXCLUSIVE_LOCK to LOCKING_ANDX_CANCEL_LOCK. */ pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; pSMB->Timeout = 0; pSMB->hdr.Mid = get_next_mid(ses->server); return SendReceive(xid, ses, in_buf, out_buf, &bytes_returned, 0); }
static int smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst) { int rc; struct kvec *iov = rqst->rq_iov; int n_vec = rqst->rq_nvec; unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); unsigned long send_length; unsigned int i; size_t total_len = 0, sent, size; struct socket *ssocket = server->ssocket; struct msghdr smb_msg; int val = 1; if (ssocket == NULL) return -ENOTSOCK; /* sanity check send length */ send_length = rqst_len(rqst); if (send_length != smb_buf_length + 4) { WARN(1, "Send length mismatch(send_length=%lu smb_buf_length=%u)\n", send_length, smb_buf_length); return -EIO; } cifs_dbg(FYI, "Sending smb: smb_len=%u\n", smb_buf_length); dump_smb(iov[0].iov_base, iov[0].iov_len); /* cork the socket */ kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, (char *)&val, sizeof(val)); size = 0; for (i = 0; i < n_vec; i++) size += iov[i].iov_len; iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, iov, n_vec, size); rc = smb_send_kvec(server, &smb_msg, &sent); if (rc < 0) goto uncork; total_len += sent; /* now walk the page array and send each page in it */ for (i = 0; i < rqst->rq_npages; i++) { size_t len = i == rqst->rq_npages - 1 ? rqst->rq_tailsz : rqst->rq_pagesz; struct bio_vec bvec = { .bv_page = rqst->rq_pages[i], .bv_len = len }; iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC, &bvec, 1, len); rc = smb_send_kvec(server, &smb_msg, &sent); if (rc < 0) break; total_len += sent; } uncork: /* uncork it */ val = 0; kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, (char *)&val, sizeof(val)); if ((total_len > 0) && (total_len != smb_buf_length + 4)) { cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", smb_buf_length + 4, total_len); /* * If we have only sent part of an SMB then the next SMB could * be taken as the remainder of this one. We need to kill the * socket so the server throws away the partial SMB */ server->tcpStatus = CifsNeedReconnect; } if (rc < 0 && rc != -EINTR) cifs_dbg(VFS, "Error %d sending data on socket to server\n", rc); else rc = 0; return rc; } static int smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) { struct smb_rqst rqst = { .rq_iov = iov, .rq_nvec = n_vec }; return smb_send_rqst(server, &rqst); } int smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, unsigned int smb_buf_length) { struct kvec iov; iov.iov_base = smb_buffer; iov.iov_len = smb_buf_length + 4; return smb_sendv(server, &iov, 1); } static int wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, int *credits) { int rc; spin_lock(&server->req_lock); if (timeout == CIFS_ASYNC_OP) { /* oplock breaks must not be held up */ server->in_flight++; *credits -= 1; spin_unlock(&server->req_lock); return 0; } while (1) { if (*credits <= 0) { spin_unlock(&server->req_lock); cifs_num_waiters_inc(server); rc = wait_event_killable(server->request_q, has_credits(server, credits)); cifs_num_waiters_dec(server); if (rc) return rc; spin_lock(&server->req_lock); } else { if (server->tcpStatus == CifsExiting) { spin_unlock(&server->req_lock); return -ENOENT; } /* * Can not count locking commands against total * as they are allowed to block on server. */ /* update # of requests on the wire to server */ if (timeout != CIFS_BLOCKING_OP) { *credits -= 1; server->in_flight++; } spin_unlock(&server->req_lock); break; } } return 0; }
int compound_send_recv(const unsigned int xid, struct cifs_ses *ses, const int flags, const int num_rqst, struct smb_rqst *rqst, int *resp_buf_type, struct kvec *resp_iov) { int i, j, rc = 0; int timeout, optype; struct mid_q_entry *midQ[MAX_COMPOUND]; unsigned int credits = 1; char *buf; timeout = flags & CIFS_TIMEOUT_MASK; optype = flags & CIFS_OP_MASK; for (i = 0; i < num_rqst; i++) resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ if ((ses == NULL) || (ses->server == NULL)) { cifs_dbg(VFS, "Null session\n"); return -EIO; } if (ses->server->tcpStatus == CifsExiting) return -ENOENT; /* * Ensure that we do not send more than 50 overlapping requests * to the same server. We may make this configurable later or * use ses->maxReq. */ rc = wait_for_free_request(ses->server, timeout, optype); if (rc) return rc; /* * Make sure that we sign in the same order that we send on this socket * and avoid races inside tcp sendmsg code that could cause corruption * of smb data. */ mutex_lock(&ses->server->srv_mutex); for (i = 0; i < num_rqst; i++) { midQ[i] = ses->server->ops->setup_request(ses, &rqst[i]); if (IS_ERR(midQ[i])) { for (j = 0; j < i; j++) cifs_delete_mid(midQ[j]); mutex_unlock(&ses->server->srv_mutex); /* Update # of requests on wire to server */ add_credits(ses->server, 1, optype); return PTR_ERR(midQ[i]); } midQ[i]->mid_state = MID_REQUEST_SUBMITTED; /* * We don't invoke the callback compounds unless it is the last * request. */ if (i < num_rqst - 1) midQ[i]->callback = cifs_noop_callback; } cifs_in_send_inc(ses->server); rc = smb_send_rqst(ses->server, num_rqst, rqst, flags); cifs_in_send_dec(ses->server); for (i = 0; i < num_rqst; i++) cifs_save_when_sent(midQ[i]); if (rc < 0) ses->server->sequence_number -= 2; mutex_unlock(&ses->server->srv_mutex); for (i = 0; i < num_rqst; i++) { if (rc < 0) goto out; if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) smb311_update_preauth_hash(ses, rqst[i].rq_iov, rqst[i].rq_nvec); if (timeout == CIFS_ASYNC_OP) goto out; rc = wait_for_response(ses->server, midQ[i]); if (rc != 0) { cifs_dbg(FYI, "Cancelling wait for mid %llu\n", midQ[i]->mid); send_cancel(ses->server, &rqst[i], midQ[i]); spin_lock(&GlobalMid_Lock); if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { midQ[i]->mid_flags |= MID_WAIT_CANCELLED; midQ[i]->callback = DeleteMidQEntry; spin_unlock(&GlobalMid_Lock); add_credits(ses->server, 1, optype); return rc; } spin_unlock(&GlobalMid_Lock); } rc = cifs_sync_mid_result(midQ[i], ses->server); if (rc != 0) { add_credits(ses->server, 1, optype); return rc; } if (!midQ[i]->resp_buf || midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { rc = -EIO; cifs_dbg(FYI, "Bad MID state?\n"); goto out; } buf = (char *)midQ[i]->resp_buf; resp_iov[i].iov_base = buf; resp_iov[i].iov_len = midQ[i]->resp_buf_size + ses->server->vals->header_preamble_size; if (midQ[i]->large_buf) resp_buf_type[i] = CIFS_LARGE_BUFFER; else resp_buf_type[i] = CIFS_SMALL_BUFFER; if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { struct kvec iov = { .iov_base = resp_iov[i].iov_base, .iov_len = resp_iov[i].iov_len }; smb311_update_preauth_hash(ses, &iov, 1); } credits = ses->server->ops->get_credits(midQ[i]); rc = ses->server->ops->check_receive(midQ[i], ses->server, flags & CIFS_LOG_ERROR); /* mark it so buf will not be freed by cifs_delete_mid */ if ((flags & CIFS_NO_RESP) == 0) midQ[i]->resp_buf = NULL; } out: /* * This will dequeue all mids. After this it is important that the * demultiplex_thread will not process any of these mids any futher. * This is prevented above by using a noop callback that will not * wake this thread except for the very last PDU. */ for (i = 0; i < num_rqst; i++) cifs_delete_mid(midQ[i]); add_credits(ses->server, credits, optype); return rc; } 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) { return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type, resp_iov); } int SendReceive2(const unsigned int xid, struct cifs_ses *ses, struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, const int flags, struct kvec *resp_iov) { struct smb_rqst rqst; struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; int rc; if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), GFP_KERNEL); if (!new_iov) { /* otherwise cifs_send_recv below sets resp_buf_type */ *resp_buf_type = CIFS_NO_BUFFER; return -ENOMEM; } } else new_iov = s_iov; /* 1st iov is a RFC1001 length followed by the rest of the packet */ memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); new_iov[0].iov_base = new_iov[1].iov_base; new_iov[0].iov_len = 4; new_iov[1].iov_base += 4; new_iov[1].iov_len -= 4; memset(&rqst, 0, sizeof(struct smb_rqst)); rqst.rq_iov = new_iov; rqst.rq_nvec = n_vec + 1; rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); if (n_vec + 1 > CIFS_MAX_IOV_SIZE) kfree(new_iov); return rc; } int SendReceive(const unsigned int xid, struct cifs_ses *ses, struct smb_hdr *in_buf, struct smb_hdr *out_buf, int *pbytes_returned, const int timeout) { int rc = 0; struct mid_q_entry *midQ; unsigned int len = be32_to_cpu(in_buf->smb_buf_length); struct kvec iov = { .iov_base = in_buf, .iov_len = len }; struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; if (ses == NULL) { cifs_dbg(VFS, "Null smb session\n"); return -EIO; } if (ses->server == NULL) { cifs_dbg(VFS, "Null tcp session\n"); return -EIO; } if (ses->server->tcpStatus == CifsExiting) return -ENOENT; /* Ensure that we do not send more than 50 overlapping requests to the same server. We may make this configurable later or use ses->maxReq */ if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", len); return -EIO; } rc = wait_for_free_request(ses->server, timeout, 0); if (rc) return rc; /* make sure that we sign in the same order that we send on this socket and avoid races inside tcp sendmsg code that could cause corruption of smb data */ mutex_lock(&ses->server->srv_mutex); rc = allocate_mid(ses, in_buf, &midQ); if (rc) { mutex_unlock(&ses->server->srv_mutex); /* Update # of requests on wire to server */ add_credits(ses->server, 1, 0); return rc; } rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); if (rc) { mutex_unlock(&ses->server->srv_mutex); goto out; } midQ->mid_state = MID_REQUEST_SUBMITTED; cifs_in_send_inc(ses->server); rc = smb_send(ses->server, in_buf, len); cifs_in_send_dec(ses->server); cifs_save_when_sent(midQ); if (rc < 0) ses->server->sequence_number -= 2; mutex_unlock(&ses->server->srv_mutex); if (rc < 0) goto out; if (timeout == CIFS_ASYNC_OP) goto out; rc = wait_for_response(ses->server, midQ); if (rc != 0) { send_cancel(ses->server, &rqst, midQ); spin_lock(&GlobalMid_Lock); if (midQ->mid_state == MID_REQUEST_SUBMITTED) { /* no longer considered to be "in-flight" */ midQ->callback = DeleteMidQEntry; spin_unlock(&GlobalMid_Lock); add_credits(ses->server, 1, 0); return rc; } spin_unlock(&GlobalMid_Lock); } rc = cifs_sync_mid_result(midQ, ses->server); if (rc != 0) { add_credits(ses->server, 1, 0); return rc; } if (!midQ->resp_buf || !out_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { rc = -EIO; cifs_dbg(VFS, "Bad MID state?\n"); goto out; } *pbytes_returned = get_rfc1002_length(midQ->resp_buf); memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); rc = cifs_check_receive(midQ, ses->server, 0); out: cifs_delete_mid(midQ); add_credits(ses->server, 1, 0); return rc; } /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows blocking lock to return. */ static int send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, struct smb_hdr *in_buf, struct smb_hdr *out_buf) { int bytes_returned; struct cifs_ses *ses = tcon->ses; LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; /* We just modify the current in_buf to change the type of lock from LOCKING_ANDX_SHARED_LOCK or LOCKING_ANDX_EXCLUSIVE_LOCK to LOCKING_ANDX_CANCEL_LOCK. */ pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; pSMB->Timeout = 0; pSMB->hdr.Mid = get_next_mid(ses->server); return SendReceive(xid, ses, in_buf, out_buf, &bytes_returned, 0); }