cifssmb.c

Linux内核自带的cifs模块

	pSMB->DataCount = cpu_to_le16(sizeof(struct unlink_psx_rq));
	pSMB->TotalDataCount = cpu_to_le16(sizeof(struct unlink_psx_rq));
	pSMB->ParameterCount = cpu_to_le16(params);
	pSMB->TotalParameterCount = pSMB->ParameterCount;
	pSMB->InformationLevel = cpu_to_le16(SMB_POSIX_UNLINK);
	pSMB->Reserved4 = 0;
	pSMB->hdr.smb_buf_length += byte_count;
	pSMB->ByteCount = cpu_to_le16(byte_count);
	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
	if (rc) {
		cFYI(1, ("Posix delete returned %d", rc));
	}
	cifs_buf_release(pSMB);

	cifs_stats_inc(&tcon->num_deletes);

	if (rc == -EAGAIN)
		goto PsxDelete;

	return rc;
}

int
CIFSSMBDelFile(const int xid, struct cifsTconInfo *tcon, const char *fileName,
		const struct nls_table *nls_codepage, int remap)
{
	DELETE_FILE_REQ *pSMB = NULL;
	DELETE_FILE_RSP *pSMBr = NULL;
	int rc = 0;
	int bytes_returned;
	int name_len;

DelFileRetry:
	rc = smb_init(SMB_COM_DELETE, 1, tcon, (void **) &pSMB,
		      (void **) &pSMBr);
	if (rc)
		return rc;

	if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
		name_len =
		    cifsConvertToUCS((__le16 *) pSMB->fileName, fileName,
				     PATH_MAX, nls_codepage, remap);
		name_len++;	/* trailing null */
		name_len *= 2;
	} else {		/* BB improve check for buffer overruns BB */
		name_len = strnlen(fileName, PATH_MAX);
		name_len++;	/* trailing null */
		strncpy(pSMB->fileName, fileName, name_len);
	}
	pSMB->SearchAttributes =
	    cpu_to_le16(ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM);
	pSMB->BufferFormat = 0x04;
	pSMB->hdr.smb_buf_length += name_len + 1;
	pSMB->ByteCount = cpu_to_le16(name_len + 1);
	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
	cifs_stats_inc(&tcon->num_deletes);
	if (rc) {
		cFYI(1, ("Error in RMFile = %d", rc));
	}

	cifs_buf_release(pSMB);
	if (rc == -EAGAIN)
		goto DelFileRetry;

	return rc;
}

int
CIFSSMBRmDir(const int xid, struct cifsTconInfo *tcon, const char *dirName,
	     const struct nls_table *nls_codepage, int remap)
{
	DELETE_DIRECTORY_REQ *pSMB = NULL;
	DELETE_DIRECTORY_RSP *pSMBr = NULL;
	int rc = 0;
	int bytes_returned;
	int name_len;

	cFYI(1, ("In CIFSSMBRmDir"));
RmDirRetry:
	rc = smb_init(SMB_COM_DELETE_DIRECTORY, 0, tcon, (void **) &pSMB,
		      (void **) &pSMBr);
	if (rc)
		return rc;

	if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
		name_len = cifsConvertToUCS((__le16 *) pSMB->DirName, dirName,
					 PATH_MAX, nls_codepage, remap);
		name_len++;	/* trailing null */
		name_len *= 2;
	} else {		/* BB improve check for buffer overruns BB */
		name_len = strnlen(dirName, PATH_MAX);
		name_len++;	/* trailing null */
		strncpy(pSMB->DirName, dirName, name_len);
	}

	pSMB->BufferFormat = 0x04;
	pSMB->hdr.smb_buf_length += name_len + 1;
	pSMB->ByteCount = cpu_to_le16(name_len + 1);
	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
	cifs_stats_inc(&tcon->num_rmdirs);
	if (rc) {
		cFYI(1, ("Error in RMDir = %d", rc));
	}

	cifs_buf_release(pSMB);
	if (rc == -EAGAIN)
		goto RmDirRetry;
	return rc;
}

int
CIFSSMBMkDir(const int xid, struct cifsTconInfo *tcon,
	     const char *name, const struct nls_table *nls_codepage, int remap)
{
	int rc = 0;
	CREATE_DIRECTORY_REQ *pSMB = NULL;
	CREATE_DIRECTORY_RSP *pSMBr = NULL;
	int bytes_returned;
	int name_len;

	cFYI(1, ("In CIFSSMBMkDir"));
MkDirRetry:
	rc = smb_init(SMB_COM_CREATE_DIRECTORY, 0, tcon, (void **) &pSMB,
		      (void **) &pSMBr);
	if (rc)
		return rc;

	if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
		name_len = cifsConvertToUCS((__le16 *) pSMB->DirName, name,
					    PATH_MAX, nls_codepage, remap);
		name_len++;	/* trailing null */
		name_len *= 2;
	} else {		/* BB improve check for buffer overruns BB */
		name_len = strnlen(name, PATH_MAX);
		name_len++;	/* trailing null */
		strncpy(pSMB->DirName, name, name_len);
	}

	pSMB->BufferFormat = 0x04;
	pSMB->hdr.smb_buf_length += name_len + 1;
	pSMB->ByteCount = cpu_to_le16(name_len + 1);
	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
	cifs_stats_inc(&tcon->num_mkdirs);
	if (rc) {
		cFYI(1, ("Error in Mkdir = %d", rc));
	}

	cifs_buf_release(pSMB);
	if (rc == -EAGAIN)
		goto MkDirRetry;
	return rc;
}

int
CIFSPOSIXCreate(const int xid, struct cifsTconInfo *tcon, __u32 posix_flags,
		__u64 mode, __u16 * netfid, FILE_UNIX_BASIC_INFO *pRetData,
		__u32 *pOplock, const char *name,
		const struct nls_table *nls_codepage, int remap)
{
	TRANSACTION2_SPI_REQ *pSMB = NULL;
	TRANSACTION2_SPI_RSP *pSMBr = NULL;
	int name_len;
	int rc = 0;
	int bytes_returned = 0;
	__u16 params, param_offset, offset, byte_count, count;
	OPEN_PSX_REQ * pdata;
	OPEN_PSX_RSP * psx_rsp;

	cFYI(1, ("In POSIX Create"));
PsxCreat:
	rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
		      (void **) &pSMBr);
	if (rc)
		return rc;

	if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
		name_len =
		    cifsConvertToUCS((__le16 *) pSMB->FileName, name,
				     PATH_MAX, nls_codepage, remap);
		name_len++;	/* trailing null */
		name_len *= 2;
	} else {	/* BB improve the check for buffer overruns BB */
		name_len = strnlen(name, PATH_MAX);
		name_len++;	/* trailing null */
		strncpy(pSMB->FileName, name, name_len);
	}

	params = 6 + name_len;
	count = sizeof(OPEN_PSX_REQ);
	pSMB->MaxParameterCount = cpu_to_le16(2);
	pSMB->MaxDataCount = cpu_to_le16(1000);	/* large enough */
	pSMB->MaxSetupCount = 0;
	pSMB->Reserved = 0;
	pSMB->Flags = 0;
	pSMB->Timeout = 0;
	pSMB->Reserved2 = 0;
	param_offset = offsetof(struct smb_com_transaction2_spi_req,
				InformationLevel) - 4;
	offset = param_offset + params;
	pdata = (OPEN_PSX_REQ *)(((char *)&pSMB->hdr.Protocol) + offset);
	pdata->Level = SMB_QUERY_FILE_UNIX_BASIC;
	pdata->Permissions = cpu_to_le64(mode);
	pdata->PosixOpenFlags = cpu_to_le32(posix_flags);
	pdata->OpenFlags =  cpu_to_le32(*pOplock);
	pSMB->ParameterOffset = cpu_to_le16(param_offset);
	pSMB->DataOffset = cpu_to_le16(offset);
	pSMB->SetupCount = 1;
	pSMB->Reserved3 = 0;
	pSMB->SubCommand = cpu_to_le16(TRANS2_SET_PATH_INFORMATION);
	byte_count = 3 /* pad */  + params + count;

	pSMB->DataCount = cpu_to_le16(count);
	pSMB->ParameterCount = cpu_to_le16(params);
	pSMB->TotalDataCount = pSMB->DataCount;
	pSMB->TotalParameterCount = pSMB->ParameterCount;
	pSMB->InformationLevel = cpu_to_le16(SMB_POSIX_OPEN);
	pSMB->Reserved4 = 0;
	pSMB->hdr.smb_buf_length += byte_count;
	pSMB->ByteCount = cpu_to_le16(byte_count);
	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
	if (rc) {
		cFYI(1, ("Posix create returned %d", rc));
		goto psx_create_err;
	}

	cFYI(1, ("copying inode info"));
	rc = validate_t2((struct smb_t2_rsp *)pSMBr);

	if (rc || (pSMBr->ByteCount < sizeof(OPEN_PSX_RSP))) {
		rc = -EIO;	/* bad smb */
		goto psx_create_err;
	}

	/* copy return information to pRetData */
	psx_rsp = (OPEN_PSX_RSP *)((char *) &pSMBr->hdr.Protocol
			+ le16_to_cpu(pSMBr->t2.DataOffset));

	*pOplock = le16_to_cpu(psx_rsp->OplockFlags);
	if (netfid)
		*netfid = psx_rsp->Fid;   /* cifs fid stays in le */
	/* Let caller know file was created so we can set the mode. */
	/* Do we care about the CreateAction in any other cases? */
	if (cpu_to_le32(FILE_CREATE) == psx_rsp->CreateAction)
		*pOplock |= CIFS_CREATE_ACTION;
	/* check to make sure response data is there */
	if (psx_rsp->ReturnedLevel != SMB_QUERY_FILE_UNIX_BASIC) {
		pRetData->Type = -1; /* unknown */
#ifdef CONFIG_CIFS_DEBUG2
		cFYI(1, ("unknown type"));
#endif
	} else {
		if (pSMBr->ByteCount < sizeof(OPEN_PSX_RSP)
					+ sizeof(FILE_UNIX_BASIC_INFO)) {
			cERROR(1, ("Open response data too small"));
			pRetData->Type = -1;
			goto psx_create_err;
		}
		memcpy((char *) pRetData,
			(char *)psx_rsp + sizeof(OPEN_PSX_RSP),
			sizeof(FILE_UNIX_BASIC_INFO));
	}

psx_create_err:
	cifs_buf_release(pSMB);

	cifs_stats_inc(&tcon->num_mkdirs);

	if (rc == -EAGAIN)
		goto PsxCreat;

	return rc;
}

static __u16 convert_disposition(int disposition)
{
	__u16 ofun = 0;

	switch (disposition) {
		case FILE_SUPERSEDE:
			ofun = SMBOPEN_OCREATE | SMBOPEN_OTRUNC;
			break;
		case FILE_OPEN:
			ofun = SMBOPEN_OAPPEND;
			break;
		case FILE_CREATE:
			ofun = SMBOPEN_OCREATE;
			break;
		case FILE_OPEN_IF:
			ofun = SMBOPEN_OCREATE | SMBOPEN_OAPPEND;
			break;
		case FILE_OVERWRITE:
			ofun = SMBOPEN_OTRUNC;
			break;
		case FILE_OVERWRITE_IF:
			ofun = SMBOPEN_OCREATE | SMBOPEN_OTRUNC;
			break;
		default:
			cFYI(1, ("unknown disposition %d", disposition));
			ofun =  SMBOPEN_OAPPEND; /* regular open */
	}
	return ofun;
}

int
SMBLegacyOpen(const int xid, struct cifsTconInfo *tcon,
	    const char *fileName, const int openDisposition,
	    const int access_flags, const int create_options, __u16 * netfid,
	    int *pOplock, FILE_ALL_INFO * pfile_info,
	    const struct nls_table *nls_codepage, int remap)
{
	int rc = -EACCES;
	OPENX_REQ *pSMB = NULL;
	OPENX_RSP *pSMBr = NULL;
	int bytes_returned;
	int name_len;
	__u16 count;

OldOpenRetry:
	rc = smb_init(SMB_COM_OPEN_ANDX, 15, tcon, (void **) &pSMB,
		      (void **) &pSMBr);
	if (rc)
		return rc;

	pSMB->AndXCommand = 0xFF;       /* none */

	if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
		count = 1;      /* account for one byte pad to word boundary */
		name_len =
		   cifsConvertToUCS((__le16 *) (pSMB->fileName + 1),
				    fileName, PATH_MAX, nls_codepage, remap);
		name_len++;     /* trailing null */
		name_len *= 2;
	} else {                /* BB improve check for buffer overruns BB */
		count = 0;      /* no pad */
		name_len = strnlen(fileName, PATH_MAX);
		name_len++;     /* trailing null */
		strncpy(pSMB->fileName, fileName, name_len);
	}
	if (*pOplock & REQ_OPLOCK)
		pSMB->OpenFlags = cpu_to_le16(REQ_OPLOCK);
	else if (*pOplock & REQ_BATCHOPLOCK)
		pSMB->OpenFlags = cpu_to_le16(REQ_BATCHOPLOCK);

	pSMB->OpenFlags |= cpu_to_le16(REQ_MORE_INFO);
	/* BB fixme add conversion for access_flags to bits 0 - 2 of mode */
	/* 0 = read
	   1 = write
	   2 = rw
	   3 = execute
	 */
	pSMB->Mode = cpu_to_le16(2);
	pSMB->Mode |= cpu_to_le16(0x40); /* deny none */
	/* set file as system file if special file such
	   as fifo and server expecting SFU style and
	   no Unix extensions */

	if (create_options & CREATE_OPTION_SPECIAL)
		pSMB->FileAttributes = cpu_to_le16(ATTR_SYSTEM);
	else
                pSMB->FileAttributes = cpu_to_le16(0/*ATTR_NORMAL*/); /* BB FIXME */

	/* if ((omode & S_IWUGO) == 0)
		pSMB->FileAttributes |= cpu_to_le32(ATTR_READONLY);*/
	/*  Above line causes problems due to vfs splitting create into two
	    pieces - need to set mode after file created not while it is
	    being created */

	/* BB FIXME BB */
/*	pSMB->CreateOptions = cpu_to_le32(create_options &
						 CREATE_OPTIONS_MASK); */
	/* BB FIXME END BB */

	pSMB->Sattr = cpu_to_le16(ATTR_HIDDEN | ATTR_SYSTEM | ATTR_DIRECTORY);
	pSMB->OpenFunction = cpu_to_le16(convert_disposition(openDisposition));
	count += name_len;
	pSMB->hdr.smb_buf_length += count;

	pSMB->ByteCount = cpu_to_le16(count);
	/* long_op set to 1 to allow for oplock break timeouts */
	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
			 (struct smb_hdr *) pSMBr, &bytes_returned, 1);
	cifs_stats_inc(&tcon->num_opens);
	if (rc) {
		cFYI(1, ("Error in Open = %d", rc));
	} else {
	/* BB verify if wct == 15 */

/*		*pOplock = pSMBr->OplockLevel; */  /* BB take from action field BB */

		*netfid = pSMBr->Fid;   /* cifs fid stays in le */
		/* Let caller know file was created so we can set the mode. */
		/* Do we care about the CreateAction in any other cases? */
	/* BB FIXME BB */
/*		if (cpu_to_le32(FILE_CREATE) == pSMBr->CreateAction)
			*pOplock |= CIFS_CREATE_ACTION; */
	/* BB FIXME END */

		if (pfile_info) {
			pfile_info->CreationTime = 0; /* BB convert CreateTime*/
			pfile_info->LastAccessTime = 0; /* BB fixme */
			pfile_info->LastWriteTime = 0; /* BB fixme */
			pfile_info->ChangeTime = 0;  /* BB fixme */
			pfile_info->Attributes =
				cpu_to_le32(le16_to_cpu(pSMBr->FileAttributes));
			/* the file_info buf is endian converted by caller */
			pfile_info->AllocationSize =
				cpu_to_le64(le32_to_cpu(pSMBr->EndOfFile));
			pfile_info->EndOfFile = pfile_info->AllocationSize;
			pfile_info->NumberOfLinks = cpu_to_le32(1);
		}
	}

	cifs_buf_release(pSMB);
	if (rc == -EAGAIN)
		goto OldOpenRetry;
	return rc;
}

int
CIFSSMBOpen(const int xid, struct cifsTconInfo *tcon,
	    const char *fileName, const int openDisposition,
	    const int access_flags, const int create_options, __u16 * netfid,
	    int *pOplock, FILE_ALL_INFO * pfile_info,
	    const struct nls_table *nls_codepage, int remap)
{
	int rc = -EACCES;
	OPEN_REQ *pSMB = NULL;