From 792af7b05b8a78def080ec757a4d4420b9fd0cc2 Mon Sep 17 00:00:00 2001 From: Pavel Shilovsky Date: Fri, 23 Mar 2012 14:28:02 -0400 Subject: CIFS: Separate protocol-specific code from transport routines that lets us use this functions for SMB2. Signed-off-by: Pavel Shilovsky --- fs/cifs/cifs_debug.h | 2 +- fs/cifs/cifsglob.h | 6 ++ fs/cifs/cifsproto.h | 2 +- fs/cifs/cifssmb.c | 21 +++---- fs/cifs/misc.c | 5 +- fs/cifs/transport.c | 171 +++++++++++++++++++++++++++++---------------------- 6 files changed, 119 insertions(+), 88 deletions(-) diff --git a/fs/cifs/cifs_debug.h b/fs/cifs/cifs_debug.h index 8942b28..0a234c1 100644 --- a/fs/cifs/cifs_debug.h +++ b/fs/cifs/cifs_debug.h @@ -32,7 +32,7 @@ void cifs_dump_mids(struct TCP_Server_Info *); #define DBG2 0 #endif extern int traceSMB; /* flag which enables the function below */ -void dump_smb(struct smb_hdr *, int); +void dump_smb(void *, int); #define CIFS_INFO 0x01 #define CIFS_RC 0x02 #define CIFS_TIMER 0x04 diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 339ebe3..c3c7d7c 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -230,6 +230,12 @@ struct cifs_mnt_data { int flags; }; +static inline unsigned int +get_rfc1002_length(void *buf) +{ + return be32_to_cpu(*((__be32 *)buf)); +} + struct TCP_Server_Info { struct list_head tcp_ses_list; struct list_head smb_ses_list; diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 503e73d..5f2f266 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -77,7 +77,7 @@ extern int SendReceive(const unsigned int /* xid */ , struct cifs_ses *, struct smb_hdr * /* out */ , int * /* bytes returned */ , const int long_op); extern int SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, - struct smb_hdr *in_buf, int flags); + char *in_buf, int flags); 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 70aac35c..a7ed01c 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -696,7 +696,7 @@ CIFSSMBTDis(const int xid, struct cifs_tcon *tcon) if (rc) return rc; - rc = SendReceiveNoRsp(xid, tcon->ses, smb_buffer, 0); + rc = SendReceiveNoRsp(xid, tcon->ses, (char *)smb_buffer, 0); if (rc) cFYI(1, "Tree disconnect failed %d", rc); @@ -792,7 +792,7 @@ CIFSSMBLogoff(const int xid, struct cifs_ses *ses) pSMB->hdr.Uid = ses->Suid; pSMB->AndXCommand = 0xFF; - rc = SendReceiveNoRsp(xid, ses, (struct smb_hdr *) pSMB, 0); + rc = SendReceiveNoRsp(xid, ses, (char *) pSMB, 0); session_already_dead: mutex_unlock(&ses->session_mutex); @@ -2420,8 +2420,7 @@ 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, (struct smb_hdr *)pSMB, - timeout); + rc = SendReceiveNoRsp(xid, tcon->ses, (char *)pSMB, timeout); /* SMB buffer freed by function above */ } cifs_stats_inc(&tcon->num_locks); @@ -2588,7 +2587,7 @@ CIFSSMBClose(const int xid, struct cifs_tcon *tcon, int smb_file_id) pSMB->FileID = (__u16) smb_file_id; pSMB->LastWriteTime = 0xFFFFFFFF; pSMB->ByteCount = 0; - rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0); + rc = SendReceiveNoRsp(xid, tcon->ses, (char *) pSMB, 0); cifs_stats_inc(&tcon->num_closes); if (rc) { if (rc != -EINTR) { @@ -2617,7 +2616,7 @@ CIFSSMBFlush(const int xid, struct cifs_tcon *tcon, int smb_file_id) pSMB->FileID = (__u16) smb_file_id; pSMB->ByteCount = 0; - rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0); + rc = SendReceiveNoRsp(xid, tcon->ses, (char *) pSMB, 0); cifs_stats_inc(&tcon->num_flushes); if (rc) cERROR(1, "Send error in Flush = %d", rc); @@ -4625,7 +4624,7 @@ CIFSFindClose(const int xid, struct cifs_tcon *tcon, pSMB->FileID = searchHandle; pSMB->ByteCount = 0; - rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0); + rc = SendReceiveNoRsp(xid, tcon->ses, (char *) pSMB, 0); if (rc) cERROR(1, "Send error in FindClose = %d", rc); @@ -5646,7 +5645,7 @@ CIFSSMBSetFileSize(const int xid, struct cifs_tcon *tcon, __u64 size, pSMB->Reserved4 = 0; inc_rfc1001_len(pSMB, byte_count); pSMB->ByteCount = cpu_to_le16(byte_count); - rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0); + rc = SendReceiveNoRsp(xid, tcon->ses, (char *) pSMB, 0); if (rc) { cFYI(1, "Send error in SetFileInfo (SetFileSize) = %d", rc); } @@ -5715,7 +5714,7 @@ CIFSSMBSetFileInfo(const int xid, struct cifs_tcon *tcon, inc_rfc1001_len(pSMB, byte_count); pSMB->ByteCount = cpu_to_le16(byte_count); memcpy(data_offset, data, sizeof(FILE_BASIC_INFO)); - rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0); + rc = SendReceiveNoRsp(xid, tcon->ses, (char *) pSMB, 0); if (rc) cFYI(1, "Send error in Set Time (SetFileInfo) = %d", rc); @@ -5774,7 +5773,7 @@ CIFSSMBSetFileDisposition(const int xid, struct cifs_tcon *tcon, inc_rfc1001_len(pSMB, byte_count); pSMB->ByteCount = cpu_to_le16(byte_count); *data_offset = delete_file ? 1 : 0; - rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0); + rc = SendReceiveNoRsp(xid, tcon->ses, (char *) pSMB, 0); if (rc) cFYI(1, "Send error in SetFileDisposition = %d", rc); @@ -6006,7 +6005,7 @@ CIFSSMBUnixSetFileInfo(const int xid, struct cifs_tcon *tcon, cifs_fill_unix_set_info(data_offset, args); - rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0); + rc = SendReceiveNoRsp(xid, tcon->ses, (char *) pSMB, 0); if (rc) cFYI(1, "Send error in Set Time (SetFileInfo) = %d", rc); diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index c273c12..e88601f 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -604,16 +604,15 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv) } void -dump_smb(struct smb_hdr *smb_buf, int smb_buf_length) +dump_smb(void *buf, int smb_buf_length) { int i, j; char debug_line[17]; - unsigned char *buffer; + unsigned char *buffer = buf; if (traceSMB == 0) return; - buffer = (unsigned char *) smb_buf; for (i = 0, j = 0; i < smb_buf_length; i++, j++) { if (i % 8 == 0) { /* have reached the beginning of line */ diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index 310918b..3bb447d 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -126,11 +126,11 @@ smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) int rc = 0; int i = 0; struct msghdr smb_msg; - struct smb_hdr *smb_buffer = iov[0].iov_base; + __be32 *buf_len = (__be32 *)(iov[0].iov_base); unsigned int len = iov[0].iov_len; unsigned int total_len; int first_vec = 0; - unsigned int smb_buf_length = be32_to_cpu(smb_buffer->smb_buf_length); + unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); struct socket *ssocket = server->ssocket; if (ssocket == NULL) @@ -150,7 +150,7 @@ smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) total_len += iov[i].iov_len; cFYI(1, "Sending smb: total_len %d", total_len); - dump_smb(smb_buffer, len); + dump_smb(iov[0].iov_base, len); i = 0; while (total_len) { @@ -158,24 +158,24 @@ smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) n_vec - first_vec, total_len); if ((rc == -ENOSPC) || (rc == -EAGAIN)) { i++; - /* if blocking send we try 3 times, since each can block - for 5 seconds. For nonblocking we have to try more - but wait increasing amounts of time allowing time for - socket to clear. The overall time we wait in either - case to send on the socket is about 15 seconds. - Similarly we wait for 15 seconds for - a response from the server in SendReceive[2] - for the server to send a response back for - most types of requests (except SMB Write - past end of file which can be slow, and - blocking lock operations). NFS waits slightly longer - than CIFS, but this can make it take longer for - nonresponsive servers to be detected and 15 seconds - is more than enough time for modern networks to - send a packet. In most cases if we fail to send - after the retries we will kill the socket and - reconnect which may clear the network problem. - */ + /* + * If blocking send we try 3 times, since each can block + * for 5 seconds. For nonblocking we have to try more + * but wait increasing amounts of time allowing time for + * socket to clear. The overall time we wait in either + * case to send on the socket is about 15 seconds. + * Similarly we wait for 15 seconds for a response from + * the server in SendReceive[2] for the server to send + * a response back for most types of requests (except + * SMB Write past end of file which can be slow, and + * blocking lock operations). NFS waits slightly longer + * than CIFS, but this can make it take longer for + * nonresponsive servers to be detected and 15 seconds + * is more than enough time for modern networks to + * send a packet. In most cases if we fail to send + * after the retries we will kill the socket and + * reconnect which may clear the network problem. + */ if ((i >= 14) || (!server->noblocksnd && (i > 2))) { cERROR(1, "sends on sock %p stuck for 15 seconds", ssocket); @@ -235,9 +235,8 @@ smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) else rc = 0; - /* Don't want to modify the buffer as a - side effect of this call. */ - smb_buffer->smb_buf_length = cpu_to_be32(smb_buf_length); + /* Don't want to modify the buffer as a side effect of this call. */ + *buf_len = cpu_to_be32(smb_buf_length); return rc; } @@ -349,6 +348,33 @@ wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) return 0; } +static int +cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov, + unsigned int nvec, struct mid_q_entry **ret_mid) +{ + int rc; + struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; + struct mid_q_entry *mid; + + /* enable signing if server requires it */ + if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) + hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; + + mid = AllocMidQEntry(hdr, server); + if (mid == NULL) + return -ENOMEM; + + /* put it on the pending_mid_q */ + spin_lock(&GlobalMid_Lock); + list_add_tail(&mid->qhead, &server->pending_mid_q); + spin_unlock(&GlobalMid_Lock); + + rc = cifs_sign_smb2(iov, nvec, server, &mid->sequence_number); + if (rc) + delete_mid(mid); + *ret_mid = mid; + return rc; +} /* * Send a SMB request and set the callback function in the mid to handle @@ -361,34 +387,18 @@ cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, { int rc; struct mid_q_entry *mid; - struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0); if (rc) return rc; - /* enable signing if server requires it */ - if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) - hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; - mutex_lock(&server->srv_mutex); - mid = AllocMidQEntry(hdr, server); - if (mid == NULL) { + rc = cifs_setup_async_request(server, iov, nvec, &mid); + if (rc) { mutex_unlock(&server->srv_mutex); cifs_add_credits(server, 1); wake_up(&server->request_q); - return -ENOMEM; - } - - /* put it on the pending_mid_q */ - spin_lock(&GlobalMid_Lock); - list_add_tail(&mid->qhead, &server->pending_mid_q); - spin_unlock(&GlobalMid_Lock); - - rc = cifs_sign_smb2(iov, nvec, server, &mid->sequence_number); - if (rc) { - mutex_unlock(&server->srv_mutex); - goto out_err; + return rc; } mid->receive = receive; @@ -424,14 +434,14 @@ out_err: */ int SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, - struct smb_hdr *in_buf, int flags) + char *in_buf, int flags) { int rc; struct kvec iov[1]; int resp_buf_type; - iov[0].iov_base = (char *)in_buf; - iov[0].iov_len = be32_to_cpu(in_buf->smb_buf_length) + 4; + iov[0].iov_base = in_buf; + iov[0].iov_len = get_rfc1002_length(in_buf) + 4; flags |= CIFS_NO_RESP; rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); @@ -514,7 +524,7 @@ int cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, bool log_error) { - unsigned int len = be32_to_cpu(mid->resp_buf->smb_buf_length) + 4; + unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; dump_smb(mid->resp_buf, min_t(u32, 92, len)); @@ -534,6 +544,24 @@ cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, return map_smb_to_linux_error(mid->resp_buf, log_error); } +static int +cifs_setup_request(struct cifs_ses *ses, struct kvec *iov, + unsigned int nvec, struct mid_q_entry **ret_mid) +{ + int rc; + struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; + struct mid_q_entry *mid; + + rc = allocate_mid(ses, hdr, &mid); + if (rc) + return rc; + rc = cifs_sign_smb2(iov, nvec, ses->server, &mid->sequence_number); + if (rc) + delete_mid(mid); + *ret_mid = mid; + return rc; +} + int SendReceive2(const unsigned int xid, struct cifs_ses *ses, struct kvec *iov, int n_vec, int *pRespBufType /* ret */, @@ -542,53 +570,51 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses, int rc = 0; int long_op; struct mid_q_entry *midQ; - struct smb_hdr *in_buf = iov[0].iov_base; + char *buf = iov[0].iov_base; long_op = flags & CIFS_TIMEOUT_MASK; *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ if ((ses == NULL) || (ses->server == NULL)) { - cifs_small_buf_release(in_buf); + cifs_small_buf_release(buf); cERROR(1, "Null session"); return -EIO; } if (ses->server->tcpStatus == CifsExiting) { - cifs_small_buf_release(in_buf); + cifs_small_buf_release(buf); 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 */ + /* + * 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, long_op); if (rc) { - cifs_small_buf_release(in_buf); + cifs_small_buf_release(buf); 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 */ + /* + * 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); + rc = cifs_setup_request(ses, iov, n_vec, &midQ); if (rc) { mutex_unlock(&ses->server->srv_mutex); - cifs_small_buf_release(in_buf); + cifs_small_buf_release(buf); /* Update # of requests on wire to server */ cifs_add_credits(ses->server, 1); return rc; } - rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); - if (rc) { - mutex_unlock(&ses->server->srv_mutex); - cifs_small_buf_release(in_buf); - goto out; - } midQ->midState = MID_REQUEST_SUBMITTED; cifs_in_send_inc(ses->server); @@ -599,30 +625,30 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses, mutex_unlock(&ses->server->srv_mutex); if (rc < 0) { - cifs_small_buf_release(in_buf); + cifs_small_buf_release(buf); goto out; } if (long_op == CIFS_ASYNC_OP) { - cifs_small_buf_release(in_buf); + cifs_small_buf_release(buf); goto out; } rc = wait_for_response(ses->server, midQ); if (rc != 0) { - send_nt_cancel(ses->server, in_buf, midQ); + send_nt_cancel(ses->server, (struct smb_hdr *)buf, midQ); spin_lock(&GlobalMid_Lock); if (midQ->midState == MID_REQUEST_SUBMITTED) { midQ->callback = DeleteMidQEntry; spin_unlock(&GlobalMid_Lock); - cifs_small_buf_release(in_buf); + cifs_small_buf_release(buf); cifs_add_credits(ses->server, 1); return rc; } spin_unlock(&GlobalMid_Lock); } - cifs_small_buf_release(in_buf); + cifs_small_buf_release(buf); rc = cifs_sync_mid_result(midQ, ses->server); if (rc != 0) { @@ -636,8 +662,9 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses, goto out; } - iov[0].iov_base = (char *)midQ->resp_buf; - iov[0].iov_len = be32_to_cpu(midQ->resp_buf->smb_buf_length) + 4; + buf = (char *)midQ->resp_buf; + iov[0].iov_base = buf; + iov[0].iov_len = get_rfc1002_length(buf) + 4; if (midQ->largeBuf) *pRespBufType = CIFS_LARGE_BUFFER; else -- cgit v1.1