cifs: use existing handle for compound_op(OP_SET_INFO) when possible

If we already have a writable handle for a path we want to set the
attributes for then use that instead of a create/set-info/close compound.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/smb2inode.c

@@ -192,14 +192,27 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
 		size[0] = sizeof(FILE_BASIC_INFO);
 		data[0] = ptr;
 
-		rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
-					COMPOUND_FID, current->tgid,
-					FILE_BASIC_INFORMATION,
-					SMB2_O_INFO_FILE, 0, data, size);
+		if (cfile)
+			rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
+				cfile->fid.persistent_fid,
+				cfile->fid.volatile_fid, current->tgid,
+				FILE_BASIC_INFORMATION,
+				SMB2_O_INFO_FILE, 0, data, size);
+		else {
+			rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
+				COMPOUND_FID,
+				COMPOUND_FID, current->tgid,
+				FILE_BASIC_INFORMATION,
+				SMB2_O_INFO_FILE, 0, data, size);
+			if (!rc) {
+				smb2_set_next_command(tcon, &rqst[num_rqst]);
+				smb2_set_related(&rqst[num_rqst]);
+			}
+		}
+
 		if (rc)
 			goto finished;
-		smb2_set_next_command(tcon, &rqst[num_rqst]);
-		smb2_set_related(&rqst[num_rqst++]);
+		num_rqst++;
 		trace_smb3_set_info_compound_enter(xid, ses->Suid, tcon->tid,
 						   full_path);
 		break;
@@ -231,8 +244,10 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
 					COMPOUND_FID, COMPOUND_FID,
 					current->tgid, FILE_RENAME_INFORMATION,
 					SMB2_O_INFO_FILE, 0, data, size);
-			smb2_set_next_command(tcon, &rqst[num_rqst]);
-			smb2_set_related(&rqst[num_rqst]);
+			if (!rc) {
+				smb2_set_next_command(tcon, &rqst[num_rqst]);
+				smb2_set_related(&rqst[num_rqst]);
+			}
 		}
 		if (rc)
 			goto finished;
@@ -475,6 +490,7 @@ smb2_mkdir_setinfo(struct inode *inode, const char *name,
 {
 	FILE_BASIC_INFO data;
 	struct cifsInodeInfo *cifs_i;
+	struct cifsFileInfo *cfile;
 	u32 dosattrs;
 	int tmprc;
 
@@ -482,10 +498,11 @@ smb2_mkdir_setinfo(struct inode *inode, const char *name,
 	cifs_i = CIFS_I(inode);
 	dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 	data.Attributes = cpu_to_le32(dosattrs);
+	cifs_get_writable_path(tcon, name, &cfile);
 	tmprc = smb2_compound_op(xid, tcon, cifs_sb, name,
 				 FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 				 CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO,
-				 NULL);
+				 cfile);
 	if (tmprc == 0)
 		cifs_i->cifsAttrs = dosattrs;
 }