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

of Read support.

Signed-off-by: Steve French <sfrench@us.ibm.com>

5 files changed, 330 insertions, 2 deletions

diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
index 026c88f486a2..cf466595b0d4 100644
--- a/fs/cifs/cifspdu.h
+++ b/fs/cifs/cifspdu.h
@@ -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
@@ -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
@@ -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;
@@ -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;
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 28b1ebbd3801..c411f2e001aa 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -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);
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 67a6240ff2ba..c8ae3ef422ba 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -680,6 +680,146 @@ MkDirRetry:
         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,
@@ -783,6 +923,81 @@ openRetry:
         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 */
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 5311c50734b0..248ddebd67f4 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -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 {
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 5857d12611e6..8ae962e7c93f 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -256,6 +256,13 @@ int cifs_open(struct inode *inode, struct file *file)
                          CREATE_NOT_DIR, &netfid, &oplock, buf,
                          cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
                                  & CIFS_MOUNT_MAP_SPECIAL_CHR);
+        if (rc == -EIO) {
+                /* Old server, try legacy style OpenX */
+                rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
+                        desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
+                        cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
+                                & CIFS_MOUNT_MAP_SPECIAL_CHR);
+        }
         if (rc) {
                 cFYI(1, ("cifs_open returned 0x%x ", rc));
                 goto out;
@@ -1210,7 +1217,12 @@ ssize_t cifs_user_read(struct file *file, char __user *read_data,
                                  open_file->netfid,
                                  current_read_size, *poffset,
                                  &bytes_read, &smb_read_data);
-
+                        if(rc == -EINVAL) {
+                                rc = SMBLegacyRead(xid, pTcon,
+                                        open_file->netfid,
+                                        current_read_size, *poffset,
+                                        &bytes_read, &smb_read_data);
+                        }
                         pSMBr = (struct smb_com_read_rsp *)smb_read_data;
                         if (copy_to_user(current_offset, 
                                          smb_read_data + 4 /* RFC1001 hdr */
@@ -1287,6 +1299,12 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
                                  open_file->netfid,
                                  current_read_size, *poffset,
                                  &bytes_read, &current_offset);
+                        if(rc == -EINVAL) {
+                                rc = SMBLegacyRead(xid, pTcon,
+                                        open_file->netfid,
+                                        current_read_size, *poffset,
+                                        &bytes_read, &current_offset);
+                        }
                 }
                 if (rc || (bytes_read == 0)) {
                         if (total_read) {
@@ -1443,7 +1461,14 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
                                 open_file->netfid,
                                 read_size, offset,
                                 &bytes_read, &smb_read_data);
-                        /* BB need to check return code here */
+                        if (rc == -EINVAL) {
+                                rc = SMBLegacyRead(xid, pTcon,
+                                        open_file->netfid,
+                                        read_size, offset,
+                                        &bytes_read, &smb_read_data);
+                        }
+
+                        /* BB more RC checks ? */
                         if (rc== -EAGAIN) {
                                 if (smb_read_data) {
                                         cifs_buf_release(smb_read_data);