xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[CIFS] Add support for legacy servers part 5

Browse Source 
Handle small negotiated read sizes (under 4K) and finish up
read and write support.

Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French
2005-08-31 21:50:37 -07:00
parent 1c9551878c
commit bfa0d75a1e
5 changed files with 39 additions and 137 deletions
Download Patch File Download Diff File Expand all files Collapse all files

99
fs/cifs/cifssmb.c
View File

@@ -923,81 +923,6 @@ 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 */
@@ -1012,11 +937,16 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon,
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 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon,
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);