[CIFS] Add support for legacy servers part 5
Handle small negotiated read sizes (under 4K) and finish up
read and write support.
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 7473385..b883011 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -923,81 +923,6 @@
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 */
@@ -1012,11 +937,16 @@
READ_RSP *pSMBr = NULL;
char *pReadData = NULL;
int bytes_returned;
+ int wct;
cFYI(1,("Reading %d bytes on fid %d",count,netfid));
+ if(tcon->ses->capabilities & CAP_LARGE_FILES)
+ wct = 12;
+ else
+ wct = 10; /* old style read */
*nbytes = 0;
- rc = smb_init(SMB_COM_READ_ANDX, 12, tcon, (void **) &pSMB,
+ rc = smb_init(SMB_COM_READ_ANDX, wct, tcon, (void **) &pSMB,
(void **) &pSMBr);
if (rc)
return rc;
@@ -1028,12 +958,23 @@
pSMB->AndXCommand = 0xFF; /* none */
pSMB->Fid = netfid;
pSMB->OffsetLow = cpu_to_le32(lseek & 0xFFFFFFFF);
- pSMB->OffsetHigh = cpu_to_le32(lseek >> 32);
+ if(wct == 12)
+ pSMB->OffsetHigh = cpu_to_le32(lseek >> 32);
+ else if((lseek >> 32) > 0) /* can not handle this big offset for old */
+ return -EIO;
+
pSMB->Remaining = 0;
pSMB->MaxCount = cpu_to_le16(count & 0xFFFF);
pSMB->MaxCountHigh = cpu_to_le32(count >> 16);
- pSMB->ByteCount = 0; /* no need to do le conversion since it is 0 */
-
+ if(wct == 12)
+ pSMB->ByteCount = 0; /* no need to do le conversion since 0 */
+ else {
+ /* old style read */
+ struct smb_com_readx_req * pSMBW =
+ (struct smb_com_readx_req *)pSMB;
+ pSMBW->ByteCount = 0;
+ }
+
rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *) pSMBr, &bytes_returned, 0);
cifs_stats_inc(&tcon->num_reads);