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path: root/fs/cifs/cifssmb.c
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-rw-r--r--fs/cifs/cifssmb.c215
1 files changed, 215 insertions, 0 deletions
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 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 09:59:03 +0000