cifs: add and use CIFSSMBUnixSetFileInfo for setattr calls

cifs: add and use CIFSSMBUnixSetFileInfo for setattr calls

When there's an open filehandle, SET_FILE_INFO is apparently preferred
over SET_PATH_INFO. Add a new variant that sets a FILE_UNIX_INFO_BASIC
infolevel via SET_FILE_INFO and switch cifs_setattr_unix to use the
new call when there's an open filehandle available.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifsproto.h

@@ -220,6 +220,10 @@ struct cifs_unix_set_info_args {
 	dev_t	device;
 };
 
+extern int CIFSSMBUnixSetFileInfo(const int xid, struct cifsTconInfo *tcon,
+				  const struct cifs_unix_set_info_args *args,
+				  u16 fid, u32 pid_of_opener);
+
 extern int CIFSSMBUnixSetPathInfo(const int xid, struct cifsTconInfo *pTcon,
 			char *fileName,
 			const struct cifs_unix_set_info_args *args,

fs/cifs/cifssmb.c

@@ -5115,6 +5115,69 @@ cifs_fill_unix_set_info(FILE_UNIX_BASIC_INFO *data_offset,
 		data_offset->Type = cpu_to_le32(UNIX_SOCKET);
 }
 
+int
+CIFSSMBUnixSetFileInfo(const int xid, struct cifsTconInfo *tcon,
+		       const struct cifs_unix_set_info_args *args,
+		       u16 fid, u32 pid_of_opener)
+{
+	struct smb_com_transaction2_sfi_req *pSMB  = NULL;
+	FILE_UNIX_BASIC_INFO *data_offset;
+	int rc = 0;
+	u16 params, param_offset, offset, byte_count, count;
+
+	cFYI(1, ("Set Unix Info (via SetFileInfo)"));
+	rc = small_smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB);
+
+	if (rc)
+		return rc;
+
+	pSMB->hdr.Pid = cpu_to_le16((__u16)pid_of_opener);
+	pSMB->hdr.PidHigh = cpu_to_le16((__u16)(pid_of_opener >> 16));
+
+	params = 6;
+	pSMB->MaxSetupCount = 0;
+	pSMB->Reserved = 0;
+	pSMB->Flags = 0;
+	pSMB->Timeout = 0;
+	pSMB->Reserved2 = 0;
+	param_offset = offsetof(struct smb_com_transaction2_sfi_req, Fid) - 4;
+	offset = param_offset + params;
+
+	data_offset = (FILE_UNIX_BASIC_INFO *)
+				((char *)(&pSMB->hdr.Protocol) + offset);
+	count = sizeof(FILE_UNIX_BASIC_INFO);
+
+	pSMB->MaxParameterCount = cpu_to_le16(2);
+	/* BB find max SMB PDU from sess */
+	pSMB->MaxDataCount = cpu_to_le16(1000);
+	pSMB->SetupCount = 1;
+	pSMB->Reserved3 = 0;
+	pSMB->SubCommand = cpu_to_le16(TRANS2_SET_FILE_INFORMATION);
+	byte_count = 3 /* pad */  + params + count;
+	pSMB->DataCount = cpu_to_le16(count);
+	pSMB->ParameterCount = cpu_to_le16(params);
+	pSMB->TotalDataCount = pSMB->DataCount;
+	pSMB->TotalParameterCount = pSMB->ParameterCount;
+	pSMB->ParameterOffset = cpu_to_le16(param_offset);
+	pSMB->DataOffset = cpu_to_le16(offset);
+	pSMB->Fid = fid;
+	pSMB->InformationLevel = cpu_to_le16(SMB_SET_FILE_UNIX_BASIC);
+	pSMB->Reserved4 = 0;
+	pSMB->hdr.smb_buf_length += byte_count;
+	pSMB->ByteCount = cpu_to_le16(byte_count);
+
+	cifs_fill_unix_set_info(data_offset, args);
+
+	rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0);
+	if (rc)
+		cFYI(1, ("Send error in Set Time (SetFileInfo) = %d", rc));
+
+	/* Note: On -EAGAIN error only caller can retry on handle based calls
+		since file handle passed in no longer valid */
+
+	return rc;
+}
+
 int
 CIFSSMBUnixSetPathInfo(const int xid, struct cifsTconInfo *tcon, char *fileName,
 		       const struct cifs_unix_set_info_args *args,

fs/cifs/inode.c

@@ -1790,6 +1790,7 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 	struct cifsTconInfo *pTcon = cifs_sb->tcon;
 	struct cifs_unix_set_info_args *args = NULL;
+	struct cifsFileInfo *open_file;
 
 	cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
 		 direntry->d_name.name, attrs->ia_valid));
@@ -1876,10 +1877,18 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
 		args->ctime = NO_CHANGE_64;
 
 	args->device = 0;
-	rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
+	open_file = find_writable_file(cifsInode);
+	if (open_file) {
+		u16 nfid = open_file->netfid;
+		u32 npid = open_file->pid;
+		rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
+		atomic_dec(&open_file->wrtPending);
+	} else {
+		rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
 				    cifs_sb->local_nls,
 				    cifs_sb->mnt_cifs_flags &
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
+	}
 
 	if (!rc)
 		rc = inode_setattr(inode, attrs);