[CIFS] Fix new POSIX Locking for setting lock_type correctly on unlock

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

fs/cifs/CHANGES

@@ -1,3 +1,8 @@
+Version 1.43
+------------
+POSIX locking to servers which support CIFS POSIX Extensions
+(disabled by default controlled by proc/fs/cifs/Experimental)
+
 Version 1.42
 ------------
 Fix slow oplock break when mounted to different servers at the same time and

fs/cifs/cifsfs.h

@@ -99,5 +99,5 @@ extern ssize_t	cifs_getxattr(struct dentry *, const char *, void *, size_t);
 extern ssize_t	cifs_listxattr(struct dentry *, char *, size_t);
 extern int cifs_ioctl (struct inode * inode, struct file * filep,
 		       unsigned int command, unsigned long arg);
-#define CIFS_VERSION   "1.42"
+#define CIFS_VERSION   "1.43"
 #endif				/* _CIFSFS_H */

fs/cifs/cifsproto.h

@@ -267,7 +267,7 @@ extern int CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
 			const int waitFlag);
 extern int CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 			const __u16 smb_file_id, const int get_flag,
-			const __u64 len, const __u64 offset, 
+			const __u64 len, struct file_lock *, 
 			const __u16 lock_type, const int waitFlag);
 extern int CIFSSMBTDis(const int xid, struct cifsTconInfo *tcon);
 extern int CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses);

fs/cifs/cifssmb.c

@@ -1355,7 +1355,8 @@ CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
 int
 CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 		const __u16 smb_file_id, const int get_flag, const __u64 len,
-		const __u64 lkoffset, const __u16 lock_type, const int waitFlag)
+		struct file_lock *pLockData, const __u16 lock_type, 
+		const int waitFlag)
 {
 	struct smb_com_transaction2_sfi_req *pSMB  = NULL;
 	struct smb_com_transaction2_sfi_rsp *pSMBr = NULL;
@@ -1366,6 +1367,10 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 	__u16 params, param_offset, offset, byte_count, count;
 
 	cFYI(1, ("Posix Lock"));
+
+	if(pLockData == NULL)
+		return EINVAL;
+
 	rc = small_smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB);
 
 	if (rc)
@@ -1406,7 +1411,7 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 	if(waitFlag)
 		parm_data->lock_flags = 1;
 	parm_data->pid = cpu_to_le32(current->tgid);
-	parm_data->start = lkoffset;
+	parm_data->start = cpu_to_le64(pLockData->fl_start);
 	parm_data->length = len;  /* normalize negative numbers */
 
 	pSMB->DataOffset = cpu_to_le16(offset);
@@ -1419,8 +1424,33 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 			(struct smb_hdr *) pSMBr, &bytes_returned, 0);
 	if (rc) {
 		cFYI(1, ("Send error in Posix Lock = %d", rc));
-	}
+	} else if (get_flag) {
+		/* lock structure can be returned on get */
+		__u16 data_offset;
+		__u16 data_count;
+		rc = validate_t2((struct smb_t2_rsp *)pSMBr);
 
+		if (rc || (pSMBr->ByteCount < sizeof(struct cifs_posix_lock))) {
+			rc = -EIO;      /* bad smb */
+			goto plk_err_exit;
+		}
+		if(pLockData == NULL) {
+			rc = -EINVAL;
+			goto plk_err_exit;
+		}
+		data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
+		data_count  = le16_to_cpu(pSMBr->t2.DataCount);
+		if(data_count < sizeof(struct cifs_posix_lock)) {
+			rc = -EIO;
+			goto plk_err_exit;
+		}
+		parm_data = (struct cifs_posix_lock *)
+			((char *)&pSMBr->hdr.Protocol + data_offset);
+		if(parm_data->lock_type == cpu_to_le16(CIFS_UNLCK))
+			pLockData->fl_type = F_UNLCK;
+	}
+ 
+plk_err_exit:
 	if (pSMB)
 		cifs_small_buf_release(pSMB);
 

fs/cifs/file.c

@@ -656,7 +656,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 			else
 				posix_lock_type = CIFS_WRLCK;
 			rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */,
-					length,	pfLock->fl_start,
+					length,	pfLock,
 					posix_lock_type, wait_flag);
 			FreeXid(xid);
 			return rc;
@@ -704,7 +704,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 			return -EOPNOTSUPP;
 		}
 		rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */,
-				      length, pfLock->fl_start,
+				      length, pfLock,
 				      posix_lock_type, wait_flag);
 	} else
 		rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,