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[CIFS] Support for legacy servers part 3 - Add support for Open and most
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of Read support.

Signed-off-by: Steve French <sfrench@us.ibm.com>
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Steve French committed Aug 25, 2005
1 parent e22cb8b commit a9d02ad
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Showing 5 changed files with 330 additions and 2 deletions.
73 changes: 73 additions & 0 deletions fs/cifs/cifspdu.h
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@
#define SMB_COM_SETATTR 0x09 /* trivial response */
#define SMB_COM_LOCKING_ANDX 0x24 /* trivial response */
#define SMB_COM_COPY 0x29 /* trivial rsp, fail filename ignrd*/
#define SMB_COM_OPEN_ANDX 0x2D /* Legacy open for old servers */
#define SMB_COM_READ_ANDX 0x2E
#define SMB_COM_WRITE_ANDX 0x2F
#define SMB_COM_TRANSACTION2 0x32
Expand Down Expand Up @@ -625,6 +626,7 @@ typedef struct smb_com_findclose_req {
} FINDCLOSE_REQ;

/* OpenFlags */
#define REQ_MORE_INFO 0x00000001 /* legacy (OPEN_AND_X) only */
#define REQ_OPLOCK 0x00000002
#define REQ_BATCHOPLOCK 0x00000004
#define REQ_OPENDIRONLY 0x00000008
Expand Down Expand Up @@ -680,6 +682,62 @@ typedef struct smb_com_open_rsp {
__u16 ByteCount; /* bct = 0 */
} OPEN_RSP;

/* format of legacy open request */
typedef struct smb_com_openx_req {
struct smb_hdr hdr; /* wct = 15 */
__u8 AndXCommand;
__u8 AndXReserved;
__le16 AndXOffset;
__le16 OpenFlags;
__le16 Mode;
__le16 Sattr; /* search attributes */
__le16 FileAttributes; /* dos attrs */
__le32 CreateTime; /* os2 format */
__le16 OpenFunction;
__le32 EndOfFile;
__le32 Timeout;
__le32 Reserved;
__u16 ByteCount; /* file name follows */
char fileName[1];
} OPENX_REQ;

typedef struct smb_com_openx_rsp {
struct smb_hdr hdr; /* wct = 15 */
__u8 AndXCommand;
__u8 AndXReserved;
__le16 AndXOffset;
__u16 Fid;
__le16 FileAttributes;
__le32 LastWriteTime; /* os2 format */
__le32 EndOfFile;
__le16 Access;
__le16 FileType;
__le16 IPCState;
__le16 Action;
__u32 FileId;
__u16 Reserved;
__u16 ByteCount;
} OPENX_RSP;

/* Legacy write request for older servers */
typedef struct smb_com_writex_req {
struct smb_hdr hdr; /* wct = 12 */
__u8 AndXCommand;
__u8 AndXReserved;
__le16 AndXOffset;
__u16 Fid;
__le32 OffsetLow;
__u32 Reserved; /* Timeout */
__le16 WriteMode; /* 1 = write through */
__le16 Remaining;
__le16 Reserved2;
__le16 DataLengthLow;
__le16 DataOffset;
__le16 ByteCount;
__u8 Pad; /* BB check for whether padded to DWORD boundary and optimum performance here */
char Data[0];
} WRITEX_REQ;

typedef struct smb_com_write_req {
struct smb_hdr hdr; /* wct = 14 */
__u8 AndXCommand;
Expand Down Expand Up @@ -711,6 +769,21 @@ typedef struct smb_com_write_rsp {
__u16 ByteCount;
} WRITE_RSP;

/* legacy read request for older servers */
typedef struct smb_com_readx_req {
struct smb_hdr hdr; /* wct = 10 */
__u8 AndXCommand;
__u8 AndXReserved;
__le16 AndXOffset;
__u16 Fid;
__le32 OffsetLow;
__le16 MaxCount;
__le16 MinCount; /* obsolete */
__le32 Reserved;
__le16 Remaining;
__le16 ByteCount;
} READX_REQ;

typedef struct smb_com_read_req {
struct smb_hdr hdr; /* wct = 12 */
__u8 AndXCommand;
Expand Down
8 changes: 8 additions & 0 deletions fs/cifs/cifsproto.h
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Original file line number Diff line number Diff line change
Expand Up @@ -218,9 +218,17 @@ extern int CIFSSMBOpen(const int xid, struct cifsTconInfo *tcon,
const int access_flags, const int omode,
__u16 * netfid, int *pOplock, FILE_ALL_INFO *,
const struct nls_table *nls_codepage, int remap);
extern int SMBLegacyOpen(const int xid, struct cifsTconInfo *tcon,
const char *fileName, const int disposition,
const int access_flags, const int omode,
__u16 * netfid, int *pOplock, FILE_ALL_INFO *,
const struct nls_table *nls_codepage, int remap);
extern int CIFSSMBClose(const int xid, struct cifsTconInfo *tcon,
const int smb_file_id);

extern int SMBLegacyRead(const int xid, struct cifsTconInfo *tcon,
const int netfid, unsigned int count,
const __u64 lseek, unsigned int *nbytes, char **buf);
extern int CIFSSMBRead(const int xid, struct cifsTconInfo *tcon,
const int netfid, unsigned int count,
const __u64 lseek, unsigned int *nbytes, char **buf);
Expand Down
215 changes: 215 additions & 0 deletions fs/cifs/cifssmb.c
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Original file line number Diff line number Diff line change
Expand Up @@ -680,6 +680,146 @@ CIFSSMBMkDir(const int xid, struct cifsTconInfo *tcon,
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(ATTR_NORMAL);

/* 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->OpenFunction = 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 = pSMBr->FileAttributes;
/* the file_info buf is endian converted by caller */
pfile_info->AllocationSize = pSMBr->EndOfFile;
pfile_info->EndOfFile = pSMBr->EndOfFile;
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,
Expand Down Expand Up @@ -783,6 +923,81 @@ CIFSSMBOpen(const int xid, struct cifsTconInfo *tcon,
return rc;
}

int
SMBLegacyRead(const int xid, struct cifsTconInfo *tcon,
const int netfid, unsigned int count,
const __u64 lseek, unsigned int *nbytes, char **buf)
{
int rc = -EACCES;
READX_REQ *pSMB = NULL;
READ_RSP *pSMBr = NULL;
char *pReadData = NULL;
int bytes_returned;

cFYI(1,("Legacy read %d bytes fid %d",count,netfid));

/* field is shorter in legacy read, only 16 bits */
if(count > 2048)
count = 2048; /* BB FIXME make this configurable */

if(lseek > 0xFFFFFFFF)
return -EIO; /* can not read that far into file on old server */

*nbytes = 0;
rc = smb_init(SMB_COM_READ_ANDX, 10, tcon, (void **) &pSMB,
(void **) &pSMBr);
if (rc)
return rc;

/* tcon and ses pointer are checked in smb_init */
if (tcon->ses->server == NULL)
return -ECONNABORTED;

pSMB->AndXCommand = 0xFF; /* none */
pSMB->Fid = netfid;
pSMB->OffsetLow = cpu_to_le32(lseek & 0xFFFFFFFF);
pSMB->Remaining = 0;
pSMB->MaxCount = cpu_to_le16(count);
pSMB->Reserved = 0; /* Must Be Zero */
pSMB->ByteCount = 0; /* no need to do le conversion since it is 0 */

rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *) pSMBr, &bytes_returned, 0);
cifs_stats_inc(&tcon->num_reads);
if (rc) {
cERROR(1, ("Send error in legacy read = %d", rc));
} else {
int data_length = le16_to_cpu(pSMBr->DataLengthHigh);
data_length = data_length << 16;
data_length += le16_to_cpu(pSMBr->DataLength);
*nbytes = data_length;

/*check that DataLength would not go beyond end of SMB */
if ((data_length > CIFSMaxBufSize) || (data_length > count)) {
cFYI(1,("bad length %d for count %d",data_length,count));
rc = -EIO;
*nbytes = 0;
} else {
pReadData = (char *) (&pSMBr->hdr.Protocol) +
le16_to_cpu(pSMBr->DataOffset);
/* if(rc = copy_to_user(buf, pReadData, data_length)) {
cERROR(1,("Faulting on read rc = %d",rc));
rc = -EFAULT;
}*/ /* can not use copy_to_user when using page cache*/
if(*buf)
memcpy(*buf,pReadData,data_length);
}
}
if(*buf)
cifs_buf_release(pSMB);
else
*buf = (char *)pSMB;

/* Note: On -EAGAIN error only caller can retry on handle based calls
since file handle passed in no longer valid */
return rc;
}

/* If no buffer passed in, then caller wants to do the copy
as in the case of readpages so the SMB buffer must be
freed by the caller */
Expand Down
7 changes: 7 additions & 0 deletions fs/cifs/dir.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -184,6 +184,13 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
desiredAccess, CREATE_NOT_DIR,
&fileHandle, &oplock, buf, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
if(rc == -EIO) {
/* old server, retry the open legacy style */
rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
desiredAccess, CREATE_NOT_DIR,
&fileHandle, &oplock, buf, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
}
if (rc) {
cFYI(1, ("cifs_create returned 0x%x ", rc));
} else {
Expand Down
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